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  • 1995-1999
  • 1975-1979  (548)
  • 1890-1899
  • 1977  (548)
  • Physics  (487)
  • Industrial Chemistry
  • Rat
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Langenbeck's archives of surgery 343 (1977), S. 133-151 
    ISSN: 1435-2451
    Keywords: Peptic ulcer ; Anastomosis ; Duodenogastric reflux ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Die vorliegende Studie gilt dem Anastomosengeschwür am operierten Magen. Diese schwerwiegende Komplikation entsteht nahezu ausschließlich nach Resektionsverfahren mit duodenaler Exklusion (Billroth II; Verlegung des Duodenum in den Nebenschluß). - An 54 männlichen Wistarratten wurden verschiedene Formen der duodenalen Exklusion mit und ohne duodenogastrischen Reflux durchgeführt. Die Ergebnisse unserer Untersuchungen zeigen, daß nach duodenaler Exklusionmit Reflux gesetzmäßig peptische Anastomosengeschwüre entstehen. Der kontinuierliche Reflux von Galle und Pankreassekret ist der ausschlaggebende ätiologische Faktor für die Ulcusentstehung im Grenzgebiet der Anastomose von Magen und Dünndarm. Stase im ausgeschalteten Zwölffingerdarm (Syndrom der zuführenden Schlinge) fördert die lcerogene Refluxwirkung. Fehlt der Pylorus, so potenzieren sich Reflux und Stase zur größten Ulcusfrequenz (〉 90%). Bei erhaltenem Pylorus ist die Geschwürsincidenz wesentlich geringer. Der duodenogastrische Reflux hemmt die meßbare Salzsäuresekretion signifikant (P 〈 0,01); Salzsäure spielt demnach für die Entstehung des experimentellen Anastomosengeschwürs der Ratte keine wesentliche Rolle. - Im Hinblick auf die Prophylaxe des Anastomosengeschwürs führen diese Erkenntnisse zu der Forderung, auf Operationsverfahren mit duodenaler Exklusion und Reflux (Billroth II) zu verzichten und das Operationsziel bei der Magenresektion auf die Wiederherstellung der orthograden MagenDarm-Passage zu richten.
    Notes: Summary Different types of duodenal by-pass operations with and without duodenogastric reflux were performed on 54 male Wistar rats. The results of our investigation show that following duodenal by-pass with reflux peptic anastomotic ulcer regularly occurs. The constant reflux of bile and pancreas juice is the most important aetiologic factor in the development of ulcer in the vicinity of the anastomosis between the stomach and small intestine. Stasis in the by-passed duodenum (afferent loop syndrome) promotes ulcerogenic action of reflux. In the absence of the pylorus the effects of ref lux and stasis potentiate, resulting in a high frequency of ulcer (〉 90 %). With intact pylorus the incidence is low. Duodenogastric reflux prevents hydrochloric acid secretion significantly (P 〈 0.01); hydrochloric acid thus plays a minor role in the development of experimental anastomotic ulcer of the rat. - In considering the prophylaxis against anastomotic ulcer, these findings support the claim of avoiding surgical techniques involving duodenal by-pass and reflux (Billroth II with short loop GE). Gastric resection should, therefore, aim at the reconstruction of the orthograde peristalsis.
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    European archives of oto-rhino-laryngology and head & neck 215 (1977), S. 1-9 
    ISSN: 1434-4726
    Keywords: Respiratory epithelium ; Larynx ; Microridge cells ; Rat ; Scanning electron microscopy ; Respiratorisches Epithel ; Kehlkopf ; Mikroleistenzelle ; Ratte ; Rasterelektronenmikroskopie
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Das Kehlkopfepithel ausgewachsener männlicher Albinoratten wird rasterelektronenmikroskopisch untersucht. Zusätzlich zu den zilientragenden und zu den Mikrovillizellen, zu den Bürsten- und Becherzellen, welche insgesamt für das respiratorische Epithel charakteristisch sind, werden in bestimmten Abschnitten des Larynx die Mikroleisten- oder Labyrinthzellen beschrieben. Die freie Oberfläche typischer Labyrinthzellen ist durch ein System von sich verzweigenden Mikroleisten gekennzeichnet, die miteinander durch Querbrücken verbunden sind und in der Zellperipherie eine bevorzugte Parallelausrichtung zur Zellgrenze zeigen können. Der Durchmesser der Mikroleisten beträgt ca. 0,05–0,15 μm. Die Querverbindungen zwischen den Mikroleisten haben einen Durchmesser von ca. 0,01 μm. Der Raum zwischen zwei benachbarten Querbrücken variiert. Labyrinthzellen können außer Mikroleisten auch Mikrovilli zeigen und es gibt Übergänge zwischen den Mikroridge- und den Mikrovillizellen. Die bevorzugte Lokalisation der Mikroleistenzellen im Bereich der Glottis und des Aditus laryngis wird belegt. Die mögliche Funktion dieser Zellen und ihre Bedeutung für die Diagnostik pathologischer Schleimhautveränderungen wird diskutiert.
    Notes: Summary The laryngeal epithelium of male white rats is studied by reflection scanning electron microscopy (SEM). In addition to ciliated cells, microvilli cells, brush cells and goblet cells that are characteristic for normal respiratory epithelium the microridge or labyrinth cell can be seen in particular regions of the larynx. The apical surface of a typical labyrinth cell is characterized by a system of narrow standing microridges of about 0.05–0.15 μm in diameter and interconnecting microridges with a diameter of about 0.01 μm. The microridge system of a labyrinth cell originates from the fusion of densely standing microvilli. Between microridge cells and microvilli cells all transition forms can be observed. The preferable localiziation of the microridge cell in the larynx and its possible function is discussed.
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    European archives of oto-rhino-laryngology and head & neck 217 (1977), S. 41-51 
    ISSN: 1434-4726
    Keywords: Respiratory epithelium ; Epiglottis ; Rat ; Scanning electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The epithelial surface of the epiglottis in adult male and female albino rats is studied by scanning electron microscopy. Prominent differences exist between the surface morphology as observed in the males and that observed in the females sacrificed in the estrus phase of the ovarial cycle. The differences are most pronounced in respect to the amount of secretory vesicles, microvilli- and microridge-cells and in respect to the observable number of desquamating cells. The existence and the importance of the microridge-cells are discussed. Special attention is also paid to the results indicating that at least some parts of the extrapulmonary airway epithelia act as possible target organs for sex hormones. Finally the importance of the observed differences is discussed for the correct interpretation of pathomorphological alterations in the extrapulmonary airway epithelia that have been observed under experimental conditions and during infections.
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Naunyn-Schmiedeberg's archives of pharmacology 296 (1977), S. 187-190 
    ISSN: 1432-1912
    Keywords: Cyclic nucleotide phosphodiesterase ; Gastric mucosa ; Human ; Rat ; Inhibitors
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Cyclic adenosine-3′,5′-monophosphate (cAMP) phosphodiesterases (PDE) were partially purified from human and rat gastric mucosa. Drugs known to affect the cyclic nucleotide system and/or gastric secretion were tested for effects on the PDE-activities from both species. In rat gastric mucosa PDE-activity can be detected in the 100 000×g sediment (K m =8.3 μM; V max=3.2 nmoles cAMP hydrolyzed/mg protein x min) and the cytoplasma (K m =5.6 μM; V max=2.6 nmoles cAMP hydrolyzed/mg protein x min). The most effective inhibitors of the particle-bound activity are papaverine (K i =4 μM, non-competitive) and 3-isobutyl-1-methylxanthine (K i=14 μM, competitive). There was only a modest competitive inhibition by theophylline (K i =495 μM). PDE-activity in the cytoplasma was inhibited competitively by these three drugs (papaverine: K i =6.5 μM; 3-isobutyl-1-methylxanthine: K i =37 μM; theophylline: K i =152 μM. In human gastric mucosa PDE-activity can be detected in the particular fraction (K m =23.9 μM; V max=1.2 nmoles cAMP hydrolyzed/mg protein x min), and the soluble fraction (K m =12.1 μM; V max=2.4 nmoles cAMP hydrolyzed/mg protein x min). PDE-activity in the 100 000×g sediment was inhibited by papaverine (K i =5.6 μM, non-competitive), 3-isobutyl-1-methylxanthine (K i =16 μM, non-competitive), theophylline (K i =165 μM, non-competitive), and N6-2′-O-dibutyryl-cAMP (K i =746 μM, competitive). Inhibition in the 100 000×g supernatant was noncompetitive with 3-isobutyl-1-methylxanthine (K i =7.1 μM and papaverine (K i =8.5 μM), but competitive with N6-2′-O-dibutyryl-cAMP (K i =170 μM), and theophylline (K i =225 μM). This study indicates that PDE-activities of the two species are qualitatively similar, but quantitative differences exist.
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Calcified tissue international 23 (1977), S. 161-170 
    ISSN: 1432-0827
    Keywords: Bone ; Growth ; Rat ; Remodeling ; Tetracyclines
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Summary Cortical bone remodeling along the femur diaphysis was determined in normal female rats (Sprague-Dawley) with the tetracycline technique. Three segments on the cortical bone circumference (the anterolateral, the medial, and the posterior) were found to be most suitable for the study of the remodeling process. Oxytetracycline was administered at age 60 and 75 days, and groups of animals were killed at age 75, 85, 95, and 105 days. The accumulated endosteal growth during age 60 to 75 days in the anterolateral segment was found to increase uniformly in the distal direction along the femur diaphysis. A method is described where this accumulated endosteal growth is used. This method eliminates the use of calipers to determine the section level and makes it possible to study comparable sections even after varying periods of time. The proximal part of the diaphysis showed periosteal apposition in all three segments. The periosteal apposition turned into resorption in the distal part of the diaphysis in the anterolateral and medial segments, whereas the periosteal appsition increased in the posterior segment. The endosteal growth increased in the distal direction in the anterolateral and medial segments. Irregular OTC bands made measurements of endosteal remodeling in the posterior segment impossible. The cortical width decreased in the distal direction along the femoral shaft. Comparison between the different age groups is described and also the relation between the accumulated endosteal growth and the diameter of the medullary cavity.
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  • 6
    ISSN: 1432-1106
    Keywords: Spinal cord ; Dorsal horn interneurones ; Pain mechanisms ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Electrophysiological properties of neurones in the spinal cord dorsal horn were studied in decerebrated, immobilized spinal rats. Extracellular recordings were performed at the thoraco-lumbar junction level. Each track was systematically located by extracellular injection of pontamine sky blue. According to their responses to mechanical peripheral stimuli, cells were classified in four classes: Class 1 cells: Cells activated only by nonnoxious stimuli. They were divided into — 1A: hair movement and/or touch and 1B: hair movement and/or touch and pressure or pressure only. Class 2 cells: Cells driven by both nonnoxious and noxious stimuli, divided into — 2A: hair movement and/or touch, pressure, pinch and/or pin-prick, and 2B: pressure, pinch and/or pin-prick. Class 3 cells: Cells only activated by noxious stimuli (pinch and/or pin-prick). Class 4 cells: Cells responding to joint movement or pressure on deep tissues. Peripheral transcutaneous or sural nerve stimulation clearly showed that class 1 cells were activated only by A fiber input while 68% of classes 2 and 3 cells received A and C input. Histological examination indicated that cells driven only by noxious input were located either in the deepest part or in the marginal zone (lamina I) of the dorsal horn. Nevertheless, some lamina I cells were also driven by both nonnoxious and noxious stimuli. In addition, there is a great deal of overlap between class 1 and class 2 cells. This fact was confirmed by considering the wide distribution in the dorsal horn of cells receiving A and C input. However, spinal organization of the different classes of cells consists of a preferential distribution rather than a strict lamination. This study indicates that properties of dorsal horn interneurones in the rat have a high degree of similarity with those previously described in other species (cat and monkey).
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Experimental brain research 29 (1977), S. 249-263 
    ISSN: 1432-1106
    Keywords: Preoptic area ; Basal septum ; Amygdala ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Extracellular microelectrode recordings were made from single neurones in the medial preoptic area and basal septum of normal female rats anaesthetised with urethane and the effects of stimulation of the ipsilateral amygdala (AMY) was tested. 1. Quiescent cells were excited with latencies between 4 and 〉 40 msec with the majority being between 10 and 27 msec. Variable latency, changing latency and recruitment were observed and suggest that many pathways are oligo- or polysynaptic. 2. A minority of spontaneously active units (20.6%) were excited with latencies between 5 and 36 msec. The predominant initial response was inhibition (67.1%). The remaining 12.3% of neurones did not respond. 3. A predominantly positive complex field potential was associated with excitation, particularly of quiescent neurones. 4. Inhibitory responses were classified according to duration (short: 20–60 msec; long: 100–400 msec). All responses contained an inhibitory component. Responses were further described on the basis of presence and rhythmicity of post-inhibitory excitation. 5. The majority of action potentials evoked from quiescent neurones were of small amplitude (80–150 μV) and occurred in small groups. These characteristics and their occurrence at the onset of inhibition are consistent with the view that all or a proportion of them may be generated by inhibitory interneurones. 6. Only minor differences were observed between response characteristics evoked by stimulation of the corticomedial or basolateral AMY indicating that differential effects of these regions on adenohypophysial hormone secretion are determined at the septopreoptic level.
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Experimental brain research 30 (1977), S. 149-154 
    ISSN: 1432-1106
    Keywords: Dentate and interpositus nuclei ; Pontine gray ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Following removal of a significant part of the dentate nucleus and most of the interpositus nucleus in the rat cerebellum degenerated cerebellopontine fibres are shown to end in three fairly restricted regions in the contralateral pontine gray: in the paramedian position, in the middle and in the lateral third. The three regions are arranged in rostro-caudal longitudinal columns in the caudal three-quarters of the pons and these columns are continuous with one another by regions of scattered degeneration. The fibres appear to end in relation to distal dendrites of the pontine cells.
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Experimental brain research 30 (1977), S. 313-321 
    ISSN: 1432-1106
    Keywords: Rat ; Hypoglossal nucleus ; Botulinum toxin ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The ultrastructural effects of local injection of botulinum toxin into the left half of the tongue of the rat, were studied quantitatively 35 days postoperatively in the left hypoglossal nucleus. The results showed (1) a decrease in somatic and neuropil bouton numbers because of loss of boutons with symmetrical synapses and clear spherical synaptic vesicles, (2) a decrease in the numbers of dendrite profiles in the neuropil, (3) an increase in the proportion of dendrites and boutons with unusual inclusions, suggestive of profile retraction, (4) an increase in the proportion of profiles which were unusually electron-dense, (5) an increase in the amount of astrocyte, and a growth of astrocyte sheaths around bouton-free neurone surfaces, (6) the presence of occasional microglia, and (7) subastrocytic subsurface cisterns. Control rats injected with boiled toxin had no responses except (3) and (4) above, and then only to a modest extent, possibly due to mechanical damage of a few axons or terminals at the time of injection, or to insufficient inactivation of the toxin by boiling. The results were compared with those at 35 days after axotomy, and it was concluded that botulinum toxin, which interrupts neuromuscular transmission, elicits the same responses in the hypoglossal neurones, as does transection of the hypoglossal nerve, even though earlier studies had discovered no glial replication after botulinum toxin, in contrast to axotomy.
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Experimental brain research 27 (1977), S. 211-219 
    ISSN: 1432-1106
    Keywords: Visual system ; Degeneration ; AChE ; Choline acetyltransferase ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The effect of unilateral enucleation, ablation of the visual cortex or coagulation of the lateral geniculate nucleus (LGN) upon the activity of choline acetyltransferase (ChAc) and acetylcholinesterase (AChE) in different structures of the visual system of albino rats was studied. The localization and extent of the degeneration pattern were followed up by histological silver degeneration methods. Afferents from the retina project mainly contralaterally to the dorsal and ventral LGN, the pretectal region and the superior colliculus. Afferent fibres from the dorsal LGN enter the visual cortex in area 17 only. Neurons of this area project back ipsilaterally to the LGN and the superior colliculus (SC). No significant decrease in the activity of the cholinergic marker enzyme choline acetyltransferase could be observed under any of the experimental conditions; there was rather a tendency to increased activity in the subcortical centres. AChE as a less specific marker also exhibited no gross changes in activity in the lesioned animals. The results add more direct proof to pharmacological and physiological evidence that ACh is not involved in the synaptic transmission of the direct optic projections in rats, either at the subcortical or at the cortical level.
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  • 11
    Electronic Resource
    Electronic Resource
    Springer
    Experimental brain research 29 (1977), S. 219-231 
    ISSN: 1432-1106
    Keywords: Rat ; Hypoglossal nucleus ; Delayed regeneration ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Electron micrographs of the left hypoglossal nucleus of adult male albino rats were quantitatively analyzed from 9–70 days after allowing the transected left hypoglossal nerve to regenerate after an 84 day delay. Delay was achieved by implanting the proximal stump into already innervated sternomastoid muscle, where no regeneration occurred. Regeneration was then allowed by denervating the sternomastoid. During the regenerative period the initially high number of abnormally electron dense perikarya and dendrites decreased to almost normal values, but no cell removal was seen. This suggested that the degenerate appearance of many profiles after prolonged prevention of regeneration, was reversible. The neuropil bouton and dendrite counts, and the numbers of synapsing boutons per dendrite, increased steadily to normal values from the low values of suppressed regeneration. Somatic bouton frequencies, even though already low, decreased further at 32 days, and later increased but not to normal values. The decrease at 32 days coincided with the loss of many subsurface cisterns, and dispersion of Nissl substance, all suggestive of chromatolysis. Later the subsurface cisterns and Nissl substance returned. It was suggested that the delay of complete recovery of somatic bouton frequencies might be because of lack of sensory information from the denervated muscle into which the hypoglossal nerve was regenerating, or because of abnormally low starting values for the recovery phase. Astrocyte (or, occasionally microglial) sheaths persisted along boutonfree perikaryal surfaces.
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  • 12
    Electronic Resource
    Electronic Resource
    Springer
    Anatomy and embryology 151 (1977), S. 29-34 
    ISSN: 1432-0568
    Keywords: Optic tectum ; Rat ; Cell death
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The death of cells was studied by light microscopy in the optic tectum of normal, developing rats. Normal cell death in the tectum during development has previously been described in chickens but not in a mammal. The total period of cell death was from the 20th embryonic day through the 11th postnatal day. During this period the number of dying cells was comparatively small for the first 2 days, reached a peak at birth and then decreased over the next 11 days. In comparison to the number of surviving cells the number of dead cells in each section was small. The dead cells appeared to be randomly distributed in all layers of the optic tectum.
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  • 13
    Electronic Resource
    Electronic Resource
    Springer
    Anatomy and embryology 151 (1977), S. 335-339 
    ISSN: 1432-0568
    Keywords: Autoradiography ; Hippocampus ; Neurogenesis ; Rat ; Thyroid hormone
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The postnatal development of the dentate gyrus and the effect of 5 μg/day triiodothyronine treatment was examined by means of tritiated thymidine autoradiography. The polymorph layer of the dentate gyrus is a secondary germinal layer and forms cells for the granular layer. The cell formation in the dentate gyrus was found to be nearly completed on the 21st day, but development ended only in adulthood. Thyroid-hormone treatment did not affect significantly the postnatal cell formation of the dentate gyrus, but resulted in the appearance of a great number of pycnotic cells in the granular layer.
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  • 14
    Electronic Resource
    Electronic Resource
    Springer
    Anatomy and embryology 152 (1977), S. 43-64 
    ISSN: 1432-0568
    Keywords: Habenula ; Ependyma ; Supraependymal cells ; Supraependymal axons ; Electron microscopy ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The surface features of the ependymal lining of the habenular complex in rats, aged between three weeks and nine months, were studied by means of scanning and transmission electron microscopy. The ependyma of the medial habenular nucleus is heavily ciliated, the cilia obscuring underlying substructure in SEM — preparations. On the habenular commissure most cilia are arranged in tufts. Cilia are provided with segmental indentations and occasional apical thickenings. Vesicular protrusions of the ependymal cytoplasm into the ventricular lumen and the frequent occurrence of homogeneous supraependymal globules were interpreted as signs of ependymosecretory activity of nucl. hab. med. Supraependymal cells are most numerous on the anterior and superior surface of the habenular commissure. Cells presenting features identical to Kolmer (epiplexus) cells were identified on the ventricular surface of nucl. hab. med. in one specimen showing degenerative changes of undetermined aetiology in the habenular nuclei. It is therefore suggested that such cells need not necessarily be restricted to the choroid plexus. Supraependymal unmyelinated axons are particularly numerous on both nucl. hab. med. and commiss. hab. They make desmosome contacts (maculae adherentes) with the ependymal plasmalemma. Contacts presenting all features of typical synapses were not encountered. The vesicle population of the axonal profiles mainly comprises 35–50 nm translucent round vesicles besides small numbers of 60–100 nm dense-cored vesicles and large pleiomorphic vesicles. Most probably the axons belong to the well-established dense population of serotonergic axons in the dorsal part of the third ventricle.
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  • 15
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    Anatomy and embryology 151 (1977), S. 53-62 
    ISSN: 1432-0568
    Keywords: Large intestine ; Intestinal absorption ; Postnatal development ; Rat ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The absorption of horseradish peroxidase in the rat large intestine during the postnatal developing period was investigated by cytochemical and ultrastructural methods. In the ceca and ascending colons from 4-, and 5-day-old rats, intraluminaly injected peroxidase became localised on microvilli, in the intracytoplasmic network of the apical tubules and small vacuoles (tubulo-vacuolar system), in the large supranuclear vacuole, in the Golgi apparatus, on the lateral and basal cell membranes of the surface principal cells, and also in the lumen of blood capillaries in the subjacent propria. On the other hand, the protein tracer was not seen in the large intestinal epithelial cells that lack tubulo-vacuolar systems and large supranuclear vacuoles within their cytoplasm. In the descending colons of rats of any postnatal age, the epithelial principal cells are devoid of these membrane systems, and exogenous peroxidase was not detected in the cytoplasm of the principal cells. It is assumed that at least the proximal portion of the large intestine in neonatal animals has the capacity to absorb macromolecular protein through those surface principal cells that have specialized intracellular membrane systems.
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  • 16
    ISSN: 1432-0568
    Keywords: Neurosecretion ; Adrenalectomy ; Diabetes insipidus ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The influence of adrenalectomy on the amount of “Gomori-positive” neurosecretory material in the outer layer of the median eminence and in the supraoptico-hypophysial system was studied in normal Long-Evans rats and in Long-Evans rats heterozygous and homozygous for hypothalamic diabetes insipidus. In all non-adrenalectomized rats very few “Gomori-positive” granules were found in the outer median eminence layer. After adrenalectomy the amount of the granules increased markedly in normal Long-Evans rats and only slightly in Long-Evans rats heterozygous for diabetes insipidus. However, no augmentation of the granules occurred in homozygous diabetes insipidus rats. The amount of “Gomori-positive” substances demonstrable in the supraoptic and paraventricular nuclei, in the inner layer of the median eminence, and in the neural lobe of the hypophysis was less in rats heterozygous for diabetes insipidus than in normal Long-Evans rats and the smallest in homozygous diabetes insipidus rats. No differences in the amounts of the substances were observed between adrenalectomized and non-adrenalectomized animals. The findings suggest that the “Gomori-positive” granules occurring in the outer layer of the median eminence of adrenalectomized rats are of similar origin as those of the supraoptico-hypophysial system and represent a vasopressin-neurophysin-complex. The results support the concept that vasopressin is involved in the regulation of ACTH release.
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  • 17
    Electronic Resource
    Electronic Resource
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    Anatomy and embryology 151 (1977), S. 241-265 
    ISSN: 1432-0568
    Keywords: Scanning E.M. ; Third ventricle ; Neurohypophysis ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The surface of the recessus infundibularis of the third ventricle has been studied with the scanning and transmission technique in normal and experimental material. Surface specializations such as microvilli, craters and areas of discontinuous lining are described. Supraependymal cells and fibres have been found; some of these cells form wide-meshed networks. The supraependymal fibres may be regular or varicose; the former seem to perforate the ependyma. With the transmission electron microscope the supraependymal cells are divided into three categories: nerve cells, lymphocytes and “dense cells”. Two fibre populations are distinguished: thin profiles (nerve fibres) and thick profiles (nerve terminals). Axosomatic and axoaxonic synapses are described. Synapses between supraependymal fibres and ependyma cells have also been found.
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  • 18
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    Anatomy and embryology 151 (1977), S. 63-69 
    ISSN: 1432-0568
    Keywords: Rat ; Phrenic nerve ; Accessory phrenic nerve ; Diaphragmatic myotomes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Reinnervation studies of the diaphragm led us to reinvestigate the normal anatomy of the phrenic nerve of the rat. The phrenic nerve originates from the cervical nerve roots C4 and C5. In 16 out of 19 normal rats an accessory phrenic nerve was observed receiving its segmental fibres from C6. The number of myelinated axons of the accessory phrenic nerve varied from 41 to 101 (mean: 64.3, i.e. about 15% of the average number of axons in the common phrenic nerve). The accessory phrenic nerve innervates the dorsal part of the costal and the lateral part of the crural region, whereas the remaining parts of the hemidiaphragm are supplied by the segments C4 and C5. There is no evidence for any additional contribution to the motor innervation of the diaphragm from intercostal nerves.
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  • 19
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    Acta neuropathologica 40 (1977), S. 253-257 
    ISSN: 1432-0533
    Keywords: Protein-calorie malnutrition ; Rat ; Spinal root ; Paranodal region ; OTAN method
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary During the early postnatal development of spinal roots in rats paranodal regions were often found, containing OTAN-positive inclusions in the Schwann cell cytoplasm. The presence of OTAN-positive paranodal regions showed variations in time, which were synchronous for ventral and dorsal roots. Dorsal roots, however, showed a more marked presence during development than ventral roots. Spinal roots of animals submitted to a 50% food restriction, were shown to contain more OTAN-positive paranodal regions than controls. This was true for ventral as well as dorsal roots. It is suggested that crowding of internodal segments could be one factor, determining the presence of paranodal, OTAN-positive material.
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  • 20
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    Acta neuropathologica 40 (1977), S. 249-252 
    ISSN: 1432-0533
    Keywords: Low-protein diet ; Rat ; Peripheral nerve ; Paranodal area ; Morphometry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Young rats, submitted to severe protein restriction were studied concerning the width of intermyelin gaps at the nodes of Ranvier in peripheral nerve fibres. The results gave no proof of increased paranodal myelin retraction in lumbar spinal roots or the sciatic nerves of low-protein rats. Malnourished rats as well as controls showed great interindividual differences as to the presence of nodes with wide inter-myelin gaps.
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  • 21
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    Calcified tissue international 22 (1977), S. 77-84 
    ISSN: 1432-0827
    Keywords: Fluoride ; Blood plasma ; Enamel mineralization ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Abstract It is postulated that tissue fluid F concentrations are the primary determinants of fluoride effects on bones and developing teeth and that these concentrations are dependent on, or mirrored by, blood plasma F. It has earlier been shown that the plasma F levels are dependent on the dietary F supply as well as on skeletal F concentration. Fasting and post-ingestion or postinjection plasma F levels have been determined in rats on F doses that cause different degrees of enamel fluorosis. The results indicate that temporary peak values rather than elevated fasting values are responsible for the occurrence of enamel fluorosis and that the peak values must approach about 10 μM in order to block enamel formation by the ameloblasts. The diagnostic and prognostic importance of plasma F determinations is discussed.
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  • 22
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    Experimental brain research 28 (1977), S. 335-344 
    ISSN: 1432-1106
    Keywords: Hippocampus ; Rat ; Lamellae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary A series of experiments was conducted in the urethane anaesthetised rat to determine the organisation of some hippocampal pathways in this species, using stimulating and recording microelectrodes to elicit and record population spikes. It was found that the mossy fibres, alvear fibres and perforant path were clearly arranged in a lamellar fashion. Lamellar organisation could not be demonstrated for the afferents in the stratum radiatum which include the Schaffer collaterals. It was concluded that hippocampal organisation in this species essentially resembles that in the rabbit and cat.
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  • 23
    ISSN: 1432-2072
    Keywords: Rat ; Exploratory behaviour ; Stereotyped behaviour ; Hole-board ; dl-Amphetamine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract A technique is described for studying exploratory as well as stereotyped behaviour in rats using an automated hole-board. Both visual and automated recordings can be employed using the technique. Hole dipping is monitored automatically using an infra-red detector system. Repetitive patterns of hole-dipping are used as parameters of stereotyped behaviour while the more random patterns of hole-dipping are used as parameters of exploration. There was a high significant correlation between the records of hole-dipping behaviour as recorded visually and automatically. There was also a high significant correlation between the measures of repetitiveness/randomness of hole-dipping behaviour from automatic and visual recordings. The pattern and levels of hole-dipping conformed with expectations both as regards changes with time and with increasing doses of dl-amphetamine.
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  • 24
    ISSN: 1432-2072
    Keywords: Abstinence syndrome ; Tolerance ; Physical dependence ; Rat ; THC ; Morphine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Ten rats were injected s.c. with THC twice daily for 5 weeks in increasing doses. In the last 3 weeks they received 40 mg/kg THC in each administration. Ten control rats received the same amount of vehicle by the same route for the same period. The comparison of rectal temperatures of the first and fifteenth days showed that a very pronounced tolerance developed to the hypothermic effect of THC. The administration of naloxone on the 22nd and 31st days precipitated an opiatelike abstinence syndrome. The termination of the drug administration on the 35th day also produced a similar withdrawal syndrome. The most common signs of abstinence syndrome in THC-treated animals were teeth chattering, defecation, urination, dyspnea, and complete palpebral closure. Although the frequency of the incidence of the following signs were not high, they have been observed only in THC-treated animals: chewing, tremors on the face, escape behavior, jumping, eating of objects, biting of fingers, and sniffing. During abstinence, an increased locomotor activity was recorded by an activity-meter. Similarly, the total amount of excreted feces and urine was higher in the THC group than in the controls. Both abstinence scores and increased motility exhibited the peak in the 48th h of withdrawal. Some similarities between the effects of THC and morphine have been reviewed.
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  • 25
    ISSN: 1432-2013
    Keywords: Dibutyryl cyclic AMP ; Pancreas ; Rat ; Secretion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary DbcAMP≥0.1 mM induces the discharge of exportable enzymes from rat pancreas fragments incubated in vitro. This effect is qualitatively similar to the action of physiological secretagogues acting via hormone receptors: 1) it is accompanied by the appearance of exocytotic images at the acinar cell apex; 2) it is energy dependent but energy supply is low while that required for the carbamylcholine or caerulein response is high and can only be afforded by oxidative phosphorylation; 3) it is calcium dependent, but no alteration of inward or outward calcium movement can be observed; 4) it is altered by agents known to disrupt the microfilamentous microtubular system [41]. However, the secretory response to DbcAMP is quantitatively less than that obtained with hormonal stimuli. A damaging effect of DbcAMP on pancreatic acinar cells is ruled out on histological and biochemical grounds: there is no significant leakage of LDH; protein synthesis, 2-deoxy-d-glucose andl-leucine uptake are unaltered. The secretagogue effect of DbcAMP is reversible, dose-related and specific. It is not mediated by neuro-transmitter release or by interaction with their receptors. The evidence presented points to a direct interaction of DbcAMP on the pancreatic acinar cell and suggests the last step of the secretory cycle as the most probable site of action of the nucleotide derivative.
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  • 26
    ISSN: 1432-2013
    Keywords: Altitude ; Myocardium ; Regional blood flow ; Blood volume ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Circulating blood volume, cardiac output and relative organ perfusion changes were studied, using the Sapirstein method of86Rb tissue uptake, in male 75-day-old rats exposed to intermittent high altitude hypoxia (gradually up to 7000 m, 4 h daily, 5 days a week; the total number of exposures was 24). Intermittent hypobaric exposure caused a significant rise of the erythrocyte volume, whereas the plasma volume remained unchanged. The relative perfusion of the left and particularly of the right ventricular myocardium, as well as of the spleen, liver, lung, small intestine and skeletal muscle, was significantly higher. The cardiac output determined in other experimental animals similarly treated was significantly higher after 24 exposures to the intermittent high altitude hypoxia. We suggest that these changes are triggered by tissue hypoxia and a greater blood flow demand.
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  • 27
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    Pflügers Archiv 368 (1977), S. 125-128 
    ISSN: 1432-2013
    Keywords: Endotoxin ; Rat ; Fever ; Anti-endotoxin system
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In conscious unrestrained rats, at an ambient temperature of 22°C, oesophageal temperature was measured and temperature effect of single and repeated intravenous injection ofE. coli endotoxin was examined. The first injection of endotoxin in a dose of 10.0 μg/rat did not change the rat body temperature. The second injection of this dose in the same animals repeated after 48 h produced fever. With following injections the fevers observed were less pronounced. The absence of fever after a single injection of endotoxin was accompanied by the rapid loss of pyretic activity of the rat plasma samples (bioassayed in rabbits). When fever was observed (48 h interval between endotoxin injections) the pyretic activity of the rat plasma remained unchanged for 90 min following endotoxin injection. It was concluded that after a single injection endotoxin is rapidly detoxified in the rat circulation while this process does not take place after the second endotoxin injection (48 h interval). The process of endotoxin detoxification can be depressed by the pretreatment with nitrogen mustard. Analysis of changes of skin temperature following endotoxin injections and the influence of aspirin on endotoxin-induced fever suggest that the fever observed was of central origin.
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  • 28
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    Archives of toxicology 37 (1977), S. 159-164 
    ISSN: 1432-0738
    Keywords: Nickel ; Rat ; Toxicity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Zu verschiedenen Zeiten nach täglicher Zufuhr von Nickelsulfat an Ratten wurden Leber, Niere, Hoden und Herzmuskel auf biochemische und histologische Änderungen untersucht. Während sich in der Initialphase noch keine signifikanten Veränderungen nachweisen ließen, traten nach längerer Exposition deutliche enzymatische und histopathologische Veränderungen in allen vier untersuchten Organen auf. Das Ausmaß der Organläsionen zeigte einen direkten Zusammenhang mit der Behandlungsdauer.
    Notes: Abstract Biochemical and histological alterations in liver, kidney, testis and myocardium of albino rats were investigated at various intervals after daily administration of nickel sulphate. No significant changes were observed during the initial periods of the treatment, but longer exposures produced marked enzymatic and histopathological alterations in all the four organs examined. The severity of the histological lesions was found to be directly related to the duration of the treatment.
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  • 29
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    Archives of toxicology 37 (1977), S. 319-325 
    ISSN: 1432-0738
    Keywords: Sulfhydryls ; Enzymes ; Brain ; Liver ; Testis ; Manganese ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Die Wirkung von Mangan auf Sulfhydrylgruppen und SH-enthaltende Enzyme in Gehirn, Leber und Hoden von Ratten wurde untersucht. Mangan verminderte den Gehalt an Nicht-Eiweiß-SH und hemmte die Glucose-6-phosphatdehydrogenase sowie die Glutathionreduktase in diesen Geweben. In Gehirn, Leber und Hoden der Mn-behandelten Tiere war der Mn-Gehalt signifikant erhöht.
    Notes: Abstract The effect of manganese on sulfhydryls and sulfhydryl-containing enzymes in brain, liver and testis of rats was investigated. Manganese produced lowering in the contents of non-protein sulfhydryl groups and inhibited the activity of glucose-6-phosphate dehydrogenase and glutathione reductase in these tissues. The contents of the metal increased significantly in brain, liver and testis of manganese administered rats. The significance of these findings is discussed.
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  • 30
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    Archives of toxicology 37 (1977), S. 275-288 
    ISSN: 1432-0738
    Keywords: Carbromal ; Bromoethylbutyramide ; Ethylbutyrylurea ; Rat ; Pharmacokinetics ; Smooth muscle ; Carbromal ; Carbromid ; Äthylbutyrylharnstoff ; Ratte ; Pharmakokinetik ; glatter Muskel
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Oral verabreichtes Carbromal und Carbromid wurden bei Ratten in Dosen unter 20 mg/kg rasch aus dem Magen-Darmtrakt aufgenommen, aus dem Dünndarm 5–8mal rascher als aus dem Magen. Die enterale Resorption von Carbromaldosen größer als 20 mg/kg verlief wesentlich langsamer. Dies ist hauptsächlich auf eine verzögerte Magenentleerung zurückzuführen. Sowohl Carbromal als auch Carbromid hemmten in vitro den Tonus und die durch Acetylcholin induzierte Kontraktion glatter Muskeln des Magenfundus. Carbromal und Carbromid fanden sich im Organismus in gleicher Konzentration in Serum, Gehirn und Skelettmuskulatur. Im Fettgewebe wurden dreimal höhere Werte gemessen. Die Konzentrationen beider Stoffe fallen in den untersuchten vier Organen mit der gleichen Geschwindigkeit wieder ab. Es lassen sich daher mit Hilfe der leicht zu messenden Serumkonzentrationen rasch die im Organismus verteilten Mengen beider Substanzen ermitteln. Intraperitoneal injizieŕtes Carbromal und Carbromid verlassen Serum und Gehirn mit einer Halbwertzeit von 3–4 h, Äthylbutyrylharnstoff mit einer Halbwertzeit von 5–7 h. Carbromal, Carbromid und Äthylbutyrylharnstoff werden von der Ratte rasch und nahezu vollständig metabolisiert. In Urin und Kot erschienen nur Spuren dieser Substanzen. Für eine Sekretion von Carbromal und seinen beiden Metaboliten in den Magen ergab sich kein Anhalt. Die Ergebnisse werden im Hinblick auf die akute Carbromalvergiftung beim Menschen diskutiert.
    Notes: Abstract Oral doses up to 20 mg/kg of carbromal and of bromoethylbutyramide were rapidly absorbed in the rat. Absorption from the stomach ligated at the pyloric end was 5–8-fold less than absorption of carbromal injected directly into the small intestine. Oral doses greater than 20 mg/kg of carbromal disappeared more slowly from the gastro-intestinal tract because gastric emptying was delayed. Both carbromal and bromoethylbutyramide were able to reduce the basal tone and the acetylcholine-induced contraction of isolated rat fundus strips. Carbromal and bromoethylbutyramide distributed evenly between serum, brain and skeletal muscle. Concentrations in adipose tissue were three times those in the other three tissues. Concentrations of both carbromal and of bromoethylbutyramide in all four tissues declined at the same rate. Thus, serum concentration of either compound may be used to estimate the total body content. Intraperitoneally injected carbromal, bromoethylbutyramide and ethylbutyrylurea disappeared from the brain and from the serum with a half-life of 3–4 h and 5–7 h, respectively. Traces only of unchanged carbromal, bromoethylbutyramide, or ethylbutyrylurea were excreted with urine or feces indicating rapid and extensive biotransformation of the three compounds in this species. No evidence was obtained of secretion of either carbromal or its two metabolites into the lumen of the stomach. The findings are discussed as to their relevance for acute carbromal poisoning in humans.
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  • 31
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    Archives of toxicology 37 (1977), S. 219-225 
    ISSN: 1432-0738
    Keywords: Inorganic mercury ; Renal enzyme excretion ; Chelating agents ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Die Wirkung von intravenös verabreichtem HgCl2 auf die renale Ausscheidung von alkalischer Phosphatase (AP) und Leucinaminopeptidase (LAP) wurde an Ratten untersucht. Am ersten Tag nach Hg-Injektion erfolgte ein Anstieg der Enzymausscheidung, der von einem Schwellenwert von 0.44 mg Hg/kg ausgehend eine lineare Abhängigkeit von der Hg-Dosis aufwies. Am zweiten Tag wurde ein statistisch signifikanter Effekt bereits nach 0.25 mg Hg/kg beobachtet. Nach Dosen von 0.75 mg Hg/kg oder mehr fand ein Abfall der Enzymaktivität unter die Kontrollwerte statt, der mehr als 4 Tage anhielt. Behandlung mit 2,3-Dimercaptopropansulfonat (DMPS) bewirkte eine Normalisierung der AP-Ausscheidung. Eine Wirkung auf die LAP-Exkretion wurde nur bei baldiger Verabreichung von DMPS beobachtet. Das gleiche gilt für den Effekt von DMPS auf die Hg-induzierte Letalität. Die Nützlichkeit einer LAP-Bestimmung im Urin zur Abschätzung einer Hg-Inkorporation wird diskutiert.
    Notes: Abstract The effect of intravenous injections of HgCl2 on the renal excretion of alkaline phosphatase (AP) and leucine aminopeptidase (LAP) was investigated in rats. On the first day after Hg enzyme excretion showed a linear rise with the Hg dose from a threshold value of 0.44 mg Hg/kg. On the second day a statistically significant effect was seen already after 0.25 mg Hg/kg. After doses of 0.75 mg/kg or more a decrease of enzyme activity below control values occurred which persisted for more than 4 days. Treatment with 2,3-dimercaptopropansulfonate (DMPS) brought about a normalization of AP excretion. An effect on LAP excretion was observed only with early treatment. The same holds for the effect of DMPS on Hg-induced lethality. The usefulness of a measurement of LAP excretion for estimating the exposure to inorganic mercury is discussed.
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  • 32
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    Archives of toxicology 37 (1977), S. 247-263 
    ISSN: 1432-0738
    Keywords: Lead in blood ; Longterm exposure ; Learning deficit ; Overreaction ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Zur Erfassung neuropsychologischer Störungen nach ontogenetisch früher Bleiexposition wurde bei männlichen Wistar-Ratten pränatal über deren Mütter, neonatal über die Muttermilch und postnatal über Bleiazetathaltiges Futter (745 mg Pb/kg Futter) chronisch ein erhöhter Blutbleispiegel (PbB) eingestellt. In der Trächtigkeits-und Säugezeit stieg der PbB-Spiegel der Mütter von 24.2 auf 31.2 μg-% an, während derjenige der Nachkommen im Alter von ca. 16 Tagen 26.6 μg-% und im Alter von ca. 190 Tagen 28.5 μg-% betrug. PbB altersgleicher Kontrollen war stets 〈 6 μg-%. Im Alter zwischen 100 und 200 Tagen wurden 20 Bleitiere und 20 Kontrollen blind verschiedenen Verhaltensprüfungen unterzogen, und zwar einem Open Field-Test und einer visuellen Unterscheidungs-Lernaufgabe. Zwei Lernprobleme unterschiedlicher Schwierigkeit, Richtungs- und Größenunterscheidung, wurden benutzt. Im Open Field-Test waren die Bleitiere im Vergleich mit den Kontrollen signifikant unruhiger: Lokomotorische Aktivität, Aufrichten und Putzverhalten waren gesteigert. Die schwierige Größenunterscheidung erlernten nur die Kontrollen, während das leichte Problem, nämlich die Richtungsunterscheidung, von Kontroll- und Bleitieren gleich schnell erlernt wurde. Die beobachteten Bleiwirkungen, gesteigerte motorische Unruhe und Lernleistungshemmung, lassen sich als Indikatoren einer funktionellen Hirnschädigung deuten. Sie legen den Schluß nahe, daß die „Wirkschwelle” für neuropsychologische Störungen nach ontogenetisch frühzeitiger Bleieinwirkung bei der Ratte als unterhalb 35 μg/100 ml liegend angenommen werden muß.
    Notes: Abstract In order to assess neurobehavioral deficit subsequent to early low-level lead-exposure, Wistar-rats were prenatally Pb-exposed via their mothers, neonatally via their dams' milk, and later on via their diet containing lead acetate (745 mg Pb/kg diet). Blood-lead levels (PbB) of dams increased from 24.2–31.2 μg-% during pregnancy and suckling-periods, those of offsprings were 26.6 μg-% at about 16 days of age and 28.5 μg-% at about 190 days of age. Between 100 and 200 days of age 40 male offsprings were subjected to behavioral testing, namely an open field-test and a visual discrimination-learning task. Two learning-tasks of different complexity, i.e. orientation-and size-discrimination, were used. Data of 20 lead-treated animals were compared with those of 20 age-matched controls. In the open-field test lead-fed animals were significantly more restless than controls; an increase of ambulation, rearing and grooming was observed. In the difficult learning-task, i.e. size discrimination, only the controls did learn the problem, whereas only one of the lead-group did; there was, however, no difference between lead-and control-animals for the easy task, i.e. orientation-discrimination. The observed effects, namely overreaction in the open field and a deficit of visual discrimination learning, may be interpreted in terms of lead-induced CNS-dysfunction. They clearly suggest that the “no-response level” for neurobehavioral damage in the rat, subsequent to early lead-exposure, must be assumed to be lower than 35 μg/100ml.
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  • 33
    ISSN: 1432-1440
    Keywords: Histidin ; Gehirn ; Skelettmuskel ; Leber ; Urämie ; Ratte ; Histidine ; Brain ; Striated muscle ; Liver ; Uremia ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Intracellular histidine levels were determined in brain, striated muscle and liver of rats with chronic renal insufficiency (5/6-nephrectomy) and compared both with normal rats and food-restricted (pair-fed) animals. There was no difference in plasma histidine concentration of the three groups whereas in the brain of the uremic rats histidine was significantly increased. Since there existed no alteration of the cerebral histidine in the corresponding pair-fed group, the finding of a raised histidine level in the renal insufficient rats seems to be due to a specific uremic disorder caused by a cerebral disturbance in histidine metabolism.
    Notes: Zusammenfassung Bei chronisch niereninsuffizienten Ratten (5/6-Nephrektomie) wurden die intrazellulären Histidin-Konzentrationen verschiedener Organe (Gehirn, Skelettmuskel und Leber) bestimmt. Als Vergleichsgruppen dienten gesunde Kontroll-Ratten sowie sog. „pair-fed“ Ratten, die entsprechend den niereninsuffizienten Tieren eine verminderte Nahrungsmenge zu sich nahmen. Während sich in den untersuchten Gruppen die Plasma-Histidin-Konzentration nicht unterschied, war Histidin im Gehirn der chronisch niereninsuffizienten Tiere signifikant erhöht. Dieser Konzentrations-Anstieg dürfte als urämie-spezifisch anzusehen sein, da die entsprechend minderernährten Kontrolltiere keine Alteration zeigten. Als Ursache ist in erster Linie eine cerebrale Störung des Histidin-Metabolismus zu diskutieren.
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  • 34
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    Psychopharmacology 51 (1977), S. 279-283 
    ISSN: 1432-2072
    Keywords: Morphine ; Naloxone ; Abstinence signs ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Morphine pellets (75 mg) were implanted subcutaneously in albino rats. Three days later, following 24 h without water, these rats (Group MSN) were given access to a saccharin solution for 30 min, then injected with naloxone hydrochloride. The classical abstinence signs, including “wet dog shakes” and weight loss, were noted in these subjects, but not in controls given placebo pellets and/or saline injections. In addition, when given an opportunity to drink either saccharine solution or water 24 h later, Group MSN rats drank significantly less saccharin than any of the control groups. Similar drinking patterns were found even when naloxone injection was delayed as long as 3 weeks after pellet implantation, when none of the classical abstinence signs were seen and serum levels of morphine and its metabolites were 100 times lower according to radioimmunoassay. This simple and objective technique is thus more sensitive as a measure of prior morphine exposure than any of the commonly used indices. The continued utility of a dependent-nondependent dichotomy is also examined in light of these and other findings.
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  • 35
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    Psychopharmacology 54 (1977), S. 139-143 
    ISSN: 1432-2072
    Keywords: Atropine ; Cholinergic mechanisms ; Learning ; Ontogeny ; Passive avoidance ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The maturation of cholinergic inhibitory mechanisms that may be involved in passive-avoidance learning was studied in rats 14, 17, 21, 25, 28, and 34 days of age. Acquisition and extinction of the conditioned response were examined under saline and atropine sulfate (5 mg/kg). Learning was also tested following scopolamine hydrobromide injections (1, 4, 8 mg/kg) in rats 17 days of age and following α-methylatropine (5 mg/kg) in 17-and 34-day-old groups. In normal animals the rate of acquisition increased during ontogenesis, with a significant improvement between postnatal days 17 and 21, whereas the rate of extinction did not vary with age. Acquisition was impaired by atropine sulfate at all ages and even totally prevented in younger groups (14 and 17 days of age). It was also completely disrupted by scopolamine in 17-day-old rats. Extinction following acquisition under atropine was more rapid than after normal acquisition. Methyl-atropine was without effect. These results support the hypothesis of central cholinergic mechanisms involved in response suppression, already functioning in the rat 14 days of age and maturing mainly between the 17th and the 21st postnatal days.
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  • 36
    ISSN: 1432-2072
    Keywords: Rat ; Exploratory behaviour ; Stereotyped behaviour ; Hole-board ; dl-Amphetamine ; Haloperidol ; Apomorphine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Exploratory and stereotyped behaviour of Male Wistar rats was studied on a hole-board. The two forms of behaviour were differentiated according to the pattern of hole-dipping activity. Increasing doses of dl-amphetamine stimulated both forms of behaviour with stereotyped behaviour becoming predominant particularly at the higher dose levels. At the highest dose of amphetamine used (16 mg/kg) a gradual transition from exploratory to stereotyped behaviour was observed with time. As the drug wore off this transition was reversed. Haloperidol at a dosage of 0.1 and 0.05 mg/kg blocked the response to a high dose of amphetamine whereas a lower dose (0.02 mg/kg) blocked the stereotyped response to amphetamine while some exploratory behaviour still took place. Apomorphine inhibited hole-dipping but at lower doses another form of exploratory behaviour was induced, this behaviour becoming stereotyped as the dose was increased. It is concluded that there is a close relationship between exploratory and stereotyped behaviours. Monoamine systems appear to play a significant role in the regulation of both forms of behaviour.
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  • 37
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    Naunyn-Schmiedeberg's archives of pharmacology 300 (1977), S. 205-216 
    ISSN: 1432-1912
    Keywords: Chronic ethanol treatment ; Rat ; Behaviour ; Central monoamines
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Rats weaned at 16 days of age were treated with various ethanol concentrations (8–24% w/v) for 270 days. The effect of the chronic ethanol treatment on the growth rate, the diurnal pattern of drinking, the open field activity, and the conditioned avoidance acquisition and retention of the rats were studied. Termination of the chronic ethanol administration caused two types of withdrawal syndromes. The first, an acute withdrawal syndrome was observed within 12 h after the discontinuation of the ethanol treatment and was characterized by extreme hyperexcitability. The second, a delayed withdrawal syndrome was characterized by a more coordinated behavioural stimulation and developed first after about 3 days after the discontinuation of the ethanol treatment. Biochemically, the latter withdrawal syndrome was accompanied by an increased rate of tyrosine hydroxylation (measured as the accumulation of dopa after inhibition of aromatic amino acid decarboxylase) in the striatum and dopamine-rich limbic structures. No differences in the accumulation of 5-hydroxytryptophan were observed. Furthermore, there was an increased level of dopamine concomitant with a decreased level of noradrenaline in the limbic areas during ongoing ethanol treatment. On the 4th day after withdrawal of ethanol the endogenous levels of dopamine and noradrenaline were statistically significantly reduced in the limbic structures. The data of the present study indicate that chronic ethanol administration induces various kinds of behavioural changes and that these changes at least partially are mediated via central catecholamine mechanisms.
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  • 38
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    Cell & tissue research 182 (1977), S. 505-511 
    ISSN: 1432-0878
    Keywords: Endothelium ; Cerebral artery ; Filaments ; Rod-shaped inclusion ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Endothelia of the anterior cerebral arteries in rats aged 1 to 3 days were studied. Thin (about 50–90 Å) and thick (about 100–110 Å) filaments are present in the endothelia. Numerous spherical- or rod-shaped bodies, measuring approximately 0.07 to 0.3 μm in diameter and up to 0.6 μm in length occur in the endothelial cells. These bodies contain a tubular structure. The diameter of the individual tubules is about 200 Å. The present observations suggest that spherical- or rod-shaped inclusions are first synthesized in the rough endoplasmic reticulum and thereafter these materials are transported into the Golgi complex for maturation. A small number of the inclusions, however, may originate directly from the rough endoplasmic reticulum and not pass through the Golgi apparatus.
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  • 39
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    Cell & tissue research 176 (1977), S. 431-443 
    ISSN: 1432-0878
    Keywords: Cornea ; Rat ; NaK-ATPase ; K-NPPase ; Histochemistry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The sodium-potassium activated adenosine triphosphatase (NaKATPase) activity of the rat cornea was investigated histochemically using a Pb2+-precipitation technique in which adenosine triphosphate (ATP) is used as substrate and two methods for potassium-dependent para-nitrophenyl-phosphatase (K-NPPase) activity. With all the three techniques used it was demonstrated that the sodium-potassium-activated adenosine triphosphatase (NaK-ATPase) activity is localized in the cell membranes of the endothelium whereas a much weaker activity was observed in the epithelium. When the Pb2+-technique was used, the epithelial cell membranes showed a weaker reaction in the presence of ouabain. This activity was only Mg2+-dependent and was presumably due to an Mg2+-dependent ATPase. The validity of the histochemical techniques for NaK-ATPase activity is discussed. The results emphasize the importance of the endothelium as the main site of Na+ transport in the cornea. Small amounts of the enzyme are also present in the epithelium, which seems to be rich in Mg2+-ATPase. Provided that careful controls are performed, all the methods give consistent results in the cornea.
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  • 40
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    Cell & tissue research 176 (1977), S. 131-142 
    ISSN: 1432-0878
    Keywords: Pineal gland ; Graft ; Ultrastructure ; Innervation ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Pineal glands were grafted under the kidney capsule of mature male rats for periods of 20, 40, 60 and 100 days. Each grafted gland was then excised and divided into two halves. One half was processed for conventional electron microscopy and the other was fixed in aldehydes and then incubated in a zinc iodide-osmium tetroxide mixture at pH 4.4 (A-ZIO-4.4). During the forty days following the operation pinealocytes showed the typical ultrastructural features associated with cells with a high protein and/or peptide secretory activity. On the other hand, during this period, the number of granular vesicles decreased progressively. From day 40 on, the grafted pinealocytes lacked granular vesicles. During the second half of the experimental period the ultrastructure of the pinealocytes indicated that their secretory activity was considerably decreased. During the acute phase of the experimental period numerous structures regarded as the tip of growing axons as well as typical nerve fibres appeared around blood vessels and within the parenchyma of the grafted gland. In the transplanted tissue obtained 60 and 100 days after the operation the growth cones were scarce, whereas typical nerve endings became numerous. These endings contained small clear vesicles which reacted positively when the tissue was treated with A-ZIO-4.4. The secretory activity of the grafted pineal gland and the nature of the nerve fibres which innervate the graft are discussed. The authors wish to thank Mrs. E.M. Rodríguez de Calderón for her valuable help
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  • 41
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    Cell & tissue research 177 (1977), S. 287-290 
    ISSN: 1432-0878
    Keywords: Liver ; Intralobular nerves ; Rat ; Cobalt and Procion Yellow staining
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary In a recent study (Skaaring and Bierring, 1976) we found cholinesterase positive nerve-like structures in the lobules of rat liver, and scanning electron microscopy revealed cords having a distribution pattern similar to that of the cholinesterase-positive structures. To obtain further evidence for an intralobular nerve supply the methods of cobalt and Procion Yellow nerve staining (Stretton and Kravitz, 1968; Iles and Mulloney, 1971; Pitman, Tweedle and Cohen, 1972) were adapted, iontophoretic introduction of the dyes being attempted through cut axonal ends in the surface of small excised blocks of rat liver.
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  • 42
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    Cell & tissue research 177 (1977), S. 159-180 
    ISSN: 1432-0878
    Keywords: Muscle transplantation ; Rat ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Rat soleus muscles were autografted from right to left legs, and regeneration following necrosis of all original myofibres was studied after 7 to 250 days. The best regenerates were from grafts replacing all calf muscles and sutured to the tendon stumps. After 30 days the size of such regenerates was equal to those from minced gastrocnemius muscles: the cross sectional area of muscle tissue was 30% (1.7 mm2) and the number of fibres was 180% (4500) of normal soleus muscles; the fibre diameters were 10 to 40 μm. To increase the number of myoblasts before grafting some muscles were injured by Ringer solution of 70° C and transplanted after 2 days. Nevertheless, this did not influence regeneration. After 7 days clusters of myotubes occurred in the periphery of the muscle. These myotubes originated from myoblasts growing like endothelial cells on the inner face of the persisting basal lamina tubes of necrotic fibres. After 30 days the muscles were vascularized. Fibres formed in a common basal lamina detached and so looked “split”. Satellite cells of new fibres came from undifferentiated cells associated with myotubes, i.e. from myoblasts. After 30 days and more regenerates contained three sorts of fibres. 1. Thin (5 to 20 μm) fibres resembling fetal muscle fibres. They were most prominent after 30 days, and probably not yet innervated. 2. Thin (10 μm) degenerating fibres as in long-time denervated muscles. 3. Thick (more than 30 μm) mature looking fibres which were innervated and revealed end-plates. Half of the grafts studied after 30 and 60 days contained unmyelinated and myelinated axons which had grown along strands of surviving Schwann cells. After 250 days, only two muscles were studied which both lacked innervation. Almost all regenerates contained muscle spindles, which, however, were not innervated. Within the persisting spindle capsules new muscle fibres had been formed from satellite cells of the former intrafusal fibres.
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  • 43
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    Cell & tissue research 178 (1977), S. 73-82 
    ISSN: 1432-0878
    Keywords: Atrioventricular node ; Rat ; Innervation ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The problem of development of the innervation of the rat atrioventricular node has been investigated by electron microscopy. Nerve bundles appear in relation to the node as early as the second postnatal day and vesiculated axons are seen throughout the entire node by the fourth day. Intimate contacts between nodal cells, axons and terminal varicosities are frequently observed. Use of the 5-hydroxydopamine tracer technique has enabled the identification of both cholinergic and adrenergic axons. It is concluded that the node has a dual innervation although cholinergic endings far outnumber those classified as adrenergic on the sixth postnatal day. These results are quite different to earlier findings made at the light microscope level and the discrepancies are discussed with respect to the histochemical techniques used. The suggestion that nodal differentiation is induced by nerves is considered in relation to the differences in cholinesterase activity exhibited by nodal cells during normal development and following neonatal sympathectomy.
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  • 44
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    Cell & tissue research 178 (1977), S. 143-153 
    ISSN: 1432-0878
    Keywords: Median eminence ; Tanycytes ; Gonadal function ; Rat ; Japanese quail
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The ependymal linings of the median eminence were destroyed by electric cautery or intraventricular injection of picric acid in the rat and Japanese quail. In these animals the ventricular lumen near the median eminence disappeared due to adhesion of lesioned walls on both sides of the third ventricle. Electric lesions of the ependymal layer containing tanycytes did not induce appreciable disturbance in the estrous cycles. Rats in which tanycytes were lesioned by picric acid displayed 4-day estrous cycles after prolonged diestrus (10–22 days). After destruction of tanycytes in the quail, a photostimulated gonadal growth was observed. It is concluded that the tanycyte transport of the ventricular fluid to capillaries of the portal vessels appears unnecessary for maintenance of adenohypophysial gonadotrophic activities.
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  • 45
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    Cell & tissue research 182 (1977), S. 193-204 
    ISSN: 1432-0878
    Keywords: Glucagon ; Exocrine pancreas ; Secretory process ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Glucagon was infused into conscious rats in doses of 10 to 80 μg/h for periods up to 24 h. The effect on the secretory process of the exocrine pancreas was studied in vitro using isolated pancreatic lobules. A pronounced inhibition of the rate of protein synthesis and discharge of stored and newly synthesized proteins combined with increased enzyme content in the pancreas were observed after 30 min infusion. This effect was absent after longer infusion periods of up to six hours. After 12 to 24 h infusions a marked degranulation and decrease in enzyme content was observed. While the rate of protein synthesis was not significantly enhanced, both the basal and stimulated discharge of enzymes from the pancreas were increased. The results suggest a biphasic response of the pancreas to prolonged glucagon infusion.
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  • 46
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    Keywords: Paraventricular nucleus ; Rat ; Types of neurons ; Secretory cycle ; Herring body
    Source: Springer Online Journal Archives 1860-2000
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    Notes: Summary The ultrastructure of the neurosecretory cells in the paraventricular nucleus of the normal male rat was studied by electron microscopy during various functional states. Four morphologically distinct types of neurosecretory cells were observed. It appears that they do not represent different classes of cells but different phases of secretory activity of a single cell type. The perikarya of the neurosecretory cells show a definite cycle of formation and transportation of secretory granules. We have designated the phases of this cycle as: (1) phase of synthesis, (2) phase of granule production, (3) phase of granule storage and (4) phase of granule transport. The neurosecretory granules appear to be moved in bulk into the axons, forming a large axonal swelling filled with granules as a result of one cycle in the neurosecretory process. Thus it may be postulated that a secretory cycle in the perikaryon of the neurosecretory cell seems to result in the formation of a Herring body in its axon, and that its content is then conveyed to the posterior pituitary.
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  • 47
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    Langenbeck's archives of surgery 344 (1977), S. 207-217 
    ISSN: 1435-2451
    Keywords: Gastroenterostomy ; Duodenal reflux ; Epithelial lesions ; Nitrosoguanidine ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Der Einfluß des chronischen duodenogastrischen Refluxes auf die Magenschleimhaut des nicht resezierten Magens wurde im Hinblick auf die Disposition der gastroenteralen Anastomose für die Krebsentstehung tierexperimentell an männlichen Wistarratten untersucht. Hierzu wurden Tiere mit einer Gastroenterostomie ohne Enteroanastomose und Tiere, bei denen ein Reflux durch eine Y-Gastroenterostomie nach Roux ausgeschlossen war, mit einer zeitlich unterschwelligen Cancerogendosis (Nitrosoguanidin) exponiert. Es wird gezeigt, daß auch unabhängig von der Cancerogenexposition ein chronischer duodenogastrischer Reflux zu adenomartigen Drüsenproliferationen mit z. T. atypischen Epithelregeneraten an der Anastomose führt, die durch eine Gastroenterostomie nach Roux verhindert werden können. Anastomosencarcinome, wie in früheren Untersuchungen am resezierten Magen bei sonst gleichen Versuchsbedingungen beschrieben, konnten nicht induziert werden. Somit spielen für die Krebsentstehung an der gastroenteralen Anastomose neben dem Reflux auch die durch die Magenresektion selbst hervorgerufenen Veränderungen eine nicht unwesentlilche Rolle.
    Notes: Summary The cancerogenic effect of continous duodenal reflux on the gastric mucosa has been investigated in male Wistar-rats after gastrointestinal anastomosis. Groups of animals with gastroenterostomy without enteroenteral anastomosis and with Roux-en-y-anastomosis preventing duodenal reflux were treated with lower dosages of the cancerogenic Nitrosoguanidine. Proliferative mucosal alterations near the gastroenteral anastomosis were observed. In addition the gastric mucosa was characterized by adenomatous lesions caused by duodenal reflux. The changes detected were not influenced by Nitrosoguanidine and did not appear in cases of Roux-en-y-anastomosis.
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  • 48
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    Langenbeck's archives of surgery 344 (1977), S. 71-82 
    ISSN: 1435-2451
    Keywords: Cancer risk ; Resected stomach ; Rat ; Duodenogastric reflux ; N-methyl-N′-nitro-N-nitrosoguanidine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Es wurde die Frage geprüft, ob obligater duodenogastrischer Reflux unter Langzeitbedingungen das Wachstum von Carcinomen oder Sarkomen im resezierten Magen beeinflußt. 72 männliche Wistarratten wurden einer Magenresektion unterworfen. Die erforderliche Gastroenteroanastomose wurde bei 39 Tieren als short loop GE (Billroth II) mit obligatem Reflux von Galle und Duodenalsekret in den Restmagen angelegt. Die restlichen 33 Tiere erhielten eine Y-förmige GE (nach Roux) mit seitlicher Einmündung des Duodenum in den Dünndarm; Reflux von Galle in den resezierten Magen war dadurch unmöglich. Die Carcinominduktion erfolgte durch kontinuierliche Gabe von N-Methyl-N'-Nitro-N-Nitrosoguanidin im Trinkwasser. Bei der Sektion der Tiere mit Reflux 33 Wochen nach Carcinogengabe fand sich die Mehrzahl der malignen Tumore von Magenstumpf, Anastomose (GE) und angrenzendem Dünndarm in der Tiergruppe mit obligatem Reflux (13 von 22). Die Tiergruppe ohne Reflux (Y-Roux GE) wies demgegenüber signifikant weniger Carcinome auf (7 von 21); die Tumorincidenz dieser Gruppe entsprach derjenigen eines nicht operierten Kontrollkollektives (5 von 22). - Die Ergebnisse unserer Untersuchungen zeigen, daß die in der Technik des short loop durchgeführte Gastroenteroanastomose des Billroth 11-Magens das Krebswachstum im Anastomosengebiet in besonders ausgeprägtem Maße fördert. Ausschlaggebend für die gesteigerte Carcinominduktion ist der chronische Reflux von Galle und Duodenalsekret, der bei der short loop-GE obligat über den Magnrest fließt.
    Notes: Summary The purpose of this study was to find whether the reflux of bile and pancreatic juices following stomach resection (duodenogastric reflux) enhances the incidence of carcinomas near the gastroenteric anastomosis. 72 male Wistar rats were subjected to stomach resection. The gastroenteric anastomosis (GE) was performed either as short loop anastomosis (Billroth II;n = 39), thus providing a continuous duodenogastric reflux, or as Y-shaped GE (according to Roux;n = 33). By the latter technique, bile and pancreatic juices are derived quantitatively into the jejunum without coming into contact with the remaining part of the stomach. During a period of 33 weeks, operated rats as well as intact animals were given the carcinogen N-methyl-N′-nitro-N-nitrosoguanidine (NG; 120 mg/1) in the drinking water. At autopsy, 33 to 36 weeks after daily oral administration of NG, most of the tumours were found in operated rats undergoing continuous ref lux (Billroth II group). In contrast to these findings, the incidence of carcinomas was significantly lower in animals without reflux (Roux group or intact control rats).-The results of our experiments demonstrate that, in rats, the duodenogastric reflux contributes substantially to the development of carcinomas of the resected stomach.
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  • 49
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    Langenbeck's archives of surgery 344 (1977), S. 109-114 
    ISSN: 1435-2451
    Keywords: Gastric carcinoma ; Gastroenterostomy ; Bacterial flora ; Nitrit ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Die Anlage einer Gastroenterostomie ohne Enteroanastomose führt zu einer Veränderung der bakteriellen Magenbesiedlung, wobei besonders der Anteil nitritspaltender Bakterien erhöht ist. Dies hat ein Ansteigen der Nitrit-Konzentration im Magensaft zur Folge. Die hierdurch mögliche vermehrte Bildung carcinogener Nitrosamine wird im Hinblick auf das Entstehen eines Carcinoms im operierten Magen diskutiert. Da die beschriebenen Veränderungen durch eine Gastroenterostomie nach Roux weitgehend verhindert werden, soll dies bei der Passagewiederherstellung nach Operation am Magen berücksichtigt werden.
    Notes: Summary A gastroenterostomy without enteroanastomosis leads to a change in the bacterial flora of the stomach, where-by in particular the proportion of nitrite-decomposing bacteria, is enhanced. This results in an increase of nitrite concentration in the gastric fluid, which may possibly be accompanied by an augmented production of carcinogenic nitrosoamine. This latter aspect is considered with respect to the origin of carcinoma in the operated stomach. Since the reported changes will be largely prevented by a Roux-Y-gastroenterostomy, this should be taken into consideration for reconstruction of the alimentary tract after gastric surgery.
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  • 50
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    Cell & tissue research 179 (1977), S. 177-196 
    ISSN: 1432-0878
    Keywords: Lateral hypothalamic area ; Synaptic organization ; Rat ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary An ultrastructural analysis of the rat lateral hypothalamic area (LHA) was undertaken in order to provide an initial step in the characterization of this complex area which appears to participate in a number of important neural functions. The organization of the normal tuberal LHA was compared to the area following acute and chronic denervating lesions. In the normal animal, the principal features of the LHA are the presence of lateral hypothalamic neurons, a major sagittal pathway (the medial forebrain bundle, MFB) and the interposed neuropil richly populated by a variety of synaptic terminal types. Alterations in the synaptic organization of the LHA following rostral and caudal MFB lesions were most pronounced in animals with acute and chronic caudal lesions. A 10% reduction of synaptic terminals containing 800–1000 Å diameter dense core vesicles and a 10% increase in terminals containing lucent core vesicles was observed in animals with caudal lesions while no significant redistribution of synaptic terminal types occurred with rostral lesions. The preliminary degeneration experiments indicate that identification of the numerous and diverse afferents to the LHA neuropil may be aided by this method but that a detailed and systematic ultrastructural analysis will be required to identify sources of input with certainty.
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  • 51
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    Cell & tissue research 181 (1977), S. 239-244 
    ISSN: 1432-0878
    Keywords: Melatonin ; Immunohistochemistry ; Pineal gland ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary In the present study an attempt was made to demonstrate melatonin in the rat pineal gland by means of immunohistochemistry. The anti-body used was raised against 5-methoxy-N-acetyltryptophan which is chemically similar to melatonin. Specific fluorescence was demonstrable only in pineals from rats killed during the night, when melatonin formation is high. It was restricted to parenchymal cells lying in a marginal zone of the organ. These results are discussed in relation to a subdivision of the pineal parenchyma into cortical and medullary areas.
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  • 52
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    Cell & tissue research 178 (1977), S. 303-306 
    ISSN: 1432-0878
    Keywords: Pancreatic polypeptide (PP) cells ; Rat ; Ontogeny
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Cells storing pancreatic polypeptide (PP) appear in rat pancreas at the time of parturition, much later than insulin and glucagon cells. At this stage, the pancreatic polypeptide (PP) cells occur scattered in the exocrine parenchyma and in the islets. Subsequently, 5–7 days postnatally, an abrupt increase in the number of PP cells occurs. At this stage, they are fairly numerous in the islets and comparatively rare in the exocrine parenchyma. Not until 8–10 days after birth is the number of PP cells similar to that in the adult pancreas. A few PP cells were seen in the antral mucosa during the first 10 days after birth. They were not seen elsewhere in the gut.
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    Cell & tissue research 178 (1977), S. 307-312 
    ISSN: 1432-0878
    Keywords: Pancreatic polypeptide (PP) cells ; Rat ; Effect of alloxan ; Experimental diabetes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Injection of alloxan caused an almost total disappearance of insulin cells in the rat pancreas. Planimetric analysis revealed a 50 per cent reduction of the mean islet volume. The number of immunoreactive pancreatic polypeptide (PP) cells per sectioned islet was significantly increased, and the PP cell volume per islet doubled. Assuming an unchanged number of islets, the results indicate an increase in total PP cell mass following alloxan administration.
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  • 54
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    Cell & tissue research 184 (1977), S. 133-137 
    ISSN: 1432-0878
    Keywords: Pineal ; Rat ; Unusual organelle ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary An electron microscopic survey of pinealocytes from normal rats revealed a highly organized arrangement of cytoplasmic tubules. Such tubules had been previously observed in normal rats (Lin, 1967) and in rats after melatonin administration or two weeks exposure to darkness (Freire and Cardinali, 1975). In a later publication the presence of the tubules was attributed to experimental manipulation resulting in infertility (Gusek, 1976). The present study resolves the discrepancy in the literature by establishing that the tubular organelle does indeed occur in untreated male rats, but rather rarely.
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    Cell & tissue research 180 (1977), S. 303-315 
    ISSN: 1432-0878
    Keywords: Intermediate filaments ; Heart muscle cells ; Anabolic steroid hormone ; Rat ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Long-term treatment of female rats with the anabolic steroid hormone Methandrostenolone results in a conspicuous increase of intermediate sized, nonmyofibrillar filaments in muscle cells of the left cardiac ventricle, as revealed by electron microscopy. These filaments, measuring 70–110 Å in diameter, form a characteristic network at the Z-level of the sarcomere, either encircling or penetrating the Z-bands, and appear to insert into the nuclear membrane. The T-system is accompanied by the filaments adjacent to the site of the couplings. Here they are attached to subsarcolemmal electron-dense patches, which may be Z-line precursor material. The filaments may function as a cytoskeleton, to provide passive support in the mechanism of contraction and to mediate nucleo-sarcolemmal and nucleomyofibrillar exchange.
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    Cell & tissue research 183 (1977), S. 379-384 
    ISSN: 1432-0878
    Keywords: Brain ; Rat ; Diethylstilboestrol ; Autoradiography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The cellular and subcellular localization of radioactivity in the brain of immature female rats was determined by dry-mount autoradiography 2 h after iv injection of 1.0 μg of (monethyl-3H) diethylstilboestrol per 100 g body weight. A specific topographic pattern of nuclear concentration of the synthetic oestrogen was obtained similar to that for 3H-oestradiol-17β in specific neurons of the basal hypothalamus, preoptic region and amygdala. In competition experiments, the nuclear concentration of radioactivity in all areas studied was inhibited by unlabeled oestradiol, while unlabeled testosterone had no effect. These data suggest that although oestradiol can bind to androgen receptors, the oestrogen receptor itself can account for the localization seen after the injection of 3H-oestradiol.
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    Cell & tissue research 181 (1977), S. 423-426 
    ISSN: 1432-0878
    Keywords: Heart muscle cells ; Rat ; Anabolic steroid hormone ; Lesion ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Early changes in the composition of heart muscle cells of the rat caused by an anabolic hormone were investigated by electron microscopy. Mitochondria and myofibrils showed changes similar to those observed in early heart failure: The mitochondria were swollen and elongated. Their matrix was sparse and the cristae were few in number. The myofibrils showed either disintegration and widened and twisted Z-bands or a complete dissolution of the sarcomeric units.
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    Cell & tissue research 178 (1977), S. 129-141 
    ISSN: 1432-0878
    Keywords: Choroid plexus ; Vasopressin ; Neurosecretion ; Rat ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Light and electron microscopic examination of choroid plexuses from lateral ventricles of water-deprived and subcutaneously or intravenously vasopressin administered rats reveal morphologic changes typical for vasopressin responsive fluid transporting epithelia during hormonal stimulation. Ultrastructural changes noted in both dehydrated and vasopressin treated animals included: the frequent occurrence of choroidal “dark” cells, dilatation of the lateral and basal intercellular spaces, increased vacuolization of the apical cytoplasm, and a change in microvillar conformation from the normal clavate type to those with a filiform shape. On the basis of the ultrastructural changes observed it is proposed that the choroid plexus be regarded as a target tissue for vasopressin. These findings indicated that a vasopressinmediated transchoroidal cerebrospinal fluid absorption capability exists.
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    Cell & tissue research 185 (1977), S. 215-229 
    ISSN: 1432-0878
    Keywords: CRF-granules ; Adrenalectomy ; Hypothalamic lesions ; Rat ; Histology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Axons terminating in the outer layer of the median eminence of rats contain light microscopically visible granules. The granules are assumed to represent a corticotropin-releasing factor and, therefore, are called CRF granules. To find out whether neurons containing CRF-granules originate and run together with the neurons of the hypothalamus-neural lobe system (HNS), the effect of unilateral lesions in the HNS on the amount and distribution of CRF-granules was studied in bilaterally adrenalectomized rats. HNS lesions prevented the adrenalectomy-induced increase in CRF granules on the side of the lesion. Lesions outside the HNS or sham lesions did not influence the amount and distribution of the granules. The findings suggest that CRF-granules are located in terminals of neurons whose perikarya are situated in magnocellular hypothalamic nuclei. It can also be concluded that the axons of these neurons run within the HNS and do not decussate.
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  • 60
    ISSN: 1432-0878
    Keywords: Supraoptic nucleus ; Paraventricular nucleus ; Neurohypophysis ; Neurosecretory material ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Cytochemical methods using silver proteinate, silver methenamine and potassium ferrocyanide + OsO4 for ultrastructural detection of glycoproteins allow, in the posthypophysis and the magnocellular nuclei of the rat, differentiation of two types of fibres and neurons: one type containing negative granules with a homogeneous content of low electron density, the second type containing granules which demonstrate a ring-shaped deposit either of silver or of potassium ferrocyanide-osmium complex, likely to be related to a glycoproteic component. The difference between these two types is increased by prestaining “en bloc” with uranyl acetate before the silver proteinate reaction. A similar investigation was carried out on the vasopressin deficient Brattleboro rat; the neurosecretory material, present in some endings and neurones only, is of the nonreactive type, so that it appears justified to correlate the reactivity of granules with vasopressin, and consequently to distinguish neurones and fibres containing vasopressin from those in which oxytocin is quantitatively the main hormonal peptide. This conclusion is strongly supported by the fact that percentages of reactive and negative endings, as determined on this basis in the posthypophysis of normal rats from two different strains, are in good agreement with biochemical data reported in the literature.
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  • 61
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    Cell & tissue research 180 (1977), S. 505-514 
    ISSN: 1432-0878
    Keywords: Macrophage ; Lymphocyte clusters ; Lymph node ; Rat ; Immunization ; SRBC ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Normally the lymphatic sinuses of the lymph node are loosely packed with lymphocytes and free macrophages as well as with macrophages adhering to the fibrocellular trabeculae. After immunization with SRBC cluster formation occurs in the medullary sinuses of rats between a central macrophage and peripherally located lymphocytes. These rosette-like clusters are nearly identical with the clusters found during primary and secondary immune response against SRBC in vitro and seem to be the in vivo equivalent for the same immune response.
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  • 62
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    Journal of Polymer Science: Polymer Physics Edition 15 (1977), S. 1-9 
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The autocorrelation function of orientations, derived for the model of conformational jumps in a chain described in a tetrahedral lattice, has been tentatively applied to dielectric relaxation data. The complex dielectric relaxation of polymers can be interpreted by the aid of only two relaxation processes. In the case of poly(p-chlorostyrene) in solution, the characteristic times that we have calculated agree favorably with the fluorescence-depolarization results. The model has been shown to be consistent with the empirical decay function exp[- (t/τ)β] proposed by Williams.
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  • 63
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A study has been conducted on the solid-state extrusion of three semicrystalline polymers:poly-propylene (PP), poly(vinylidene fluoride) (PVDF), and high-density polyethylene (HDPE). HDPE has been extruded in continuous lengths with area reductions up to 25× at temperatures substantially below the melting region. Such extrusion has been identified as a solid-state process, since measurements of the temperature of the polymer during extrusion indicate the absence of significant heating due to deformation. In contrast, continuous lengths of PP and PVDF could not be obtained substantially below their melting temperatures, indicating that crystallization during extrusion is an important process for these polymers. Under severe extrusion conditions (low temperatures, high area reductions. etc.), all three polymers failed within the tapered region of the extrusion die. Two modes of failure have been identified, brittle fracture and, surprisingly, necking. Grid-line distortion patterns and a highly simplified upper-bound plasticity analysis both indicate that shear deformations are a major factor during high-stress extrusion.
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  • 64
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    Journal of Polymer Science: Polymer Physics Edition 15 (1977), S. 103-108 
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Polystyrenes lightly substituted with either tertiary amine groups or nitrophenol groups have been allowed to interact in concentrated t-butylbenzene solution and in bulk polymer. Above the glass transition temperature a temperature dependent equilibrium is achieved in the bulk polymer between the two substituents and the amine salt of the phenol. The degree of association found is considerably greater in the bulk polymer than in solution. The results show that much interpenetration of the polymer occurs, and the results are discussed in terms of models of the bulk amorphous state of the polymer.
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  • 65
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    Journal of Polymer Science: Polymer Physics Edition 15 (1977), S. 109-125 
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The Flory-Huggins formulation of the combinatorial entropy, supplemented with residual free energy, is applied locally to obtain the interfacial free energy and the concentration profile of polymer in the interface between two demixed polymer solution phases. Two choices were investigated for the residual free energy: a “regular solution” formulation and an empirical formulation of Koningsveld for polystyrene in cyclohexane. Asymptotic, analytical solutions of the equations near the critical solution point and solutions obtained by numerical calculations are given as a function of temperature for several molecular weights. At temperatures farther below the critical temperature the equations have no solutions. The reason for this is not entirely clear. The local formulation of the free energy used here is an improved version of a previous one, which gave wrong results for asymmetric systems (polymer in a low molecular weight solvent). This newer version is consistent with our theory of critical opalescence and gives a relation between the interface “thickness” and the correlation range of the concentration fluctuations. The calculated correlation ranges were in good accord with those found experimentally by Debye, Chu, and Woerman. That the newer version of our equations for an interface gives no acceptable solutions at lower temperatures could be caused by a “collapse” of a diffuse to a sharp interface as suggested by Nose.
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  • 66
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    Journal of Polymer Science: Polymer Physics Edition 15 (1977), S. 97-102 
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Raman depolarization ratio measurements (ρ) have been made for 20% polydimethylsiloxane (PDMS) solutions in benzene and 10% Polystyrene (PS) solutions in cyclohexane over the temperature range 20 〉 T 〉 200°C. The bands studied were the 2907 cm-1 methyl stretch in PDMS and the 1002 cm-1 ring breathing mode in PS. The measured ρ are related to rotational isomeric state populations and a qualitative picture of the polymer conformation changes over much of their miscible ranges is described. Measurements of ρ for PDMS gum over the temperature ranges 20 〈 T 〈 200°C have been obtained and the upper theta temperature has been determined to be 171 ± 3°C for PDMS/benzene. Quantitative information about the variation of the polymer solvent interaction parameter χ can in principle be obtained.
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  • 67
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    Journal of Polymer Science: Polymer Physics Edition 15 (1977), S. 137-144 
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Preferential solvation and intrinsic viscosity measurements are reported for three systems: polystyrene + benzene + methanol, polystyrene + carbon tetrachloride + methanol, and poly(2-vinylpyridine) + ethanol + cyclohexane. Plots of the coefficient of preferential solvation λ′ as a function of variation of the segment density Δρ for a given ternary system, give a single curve for a large range of molecular weight and solvent mixture composition. This correlation between λ′ and Δρ is verified in previously published data.
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  • 68
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    Journal of Polymer Science: Polymer Physics Edition 15 (1977), S. 303-320 
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The design and operation of an automated light-scattering apparatus for studying structures in polymer films are described. The apparatus has angular resolution of 0.02 and 1.0° in radial and azimuthal angles, respectively. The radial scan can be made over the range of 0.5 (or less) to 90° and the azimuthal scan covers 180°. Time resolution is in the order of milliseconds. The operation, data collection, and reduction are fully automatic. Illustrative data on the crystallization of a low density polyethylene are described.
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  • 69
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Light scattering from polybutene-1 films prepared by tubular extrusion was studied in order to investigate its crystalline superstructure and the deformation mechanism. Analysis of the light-scattering patterns together with electron micrographs, indicate the existence of sheaflike crystalline superstructures. The sheaves are aligned nearly side by side with their axes preferentially oriented perpendicular to the machine direction. The Hv scattering patterns exhibit a “butterfly” appearance. Analysis of the patterns in terms of scattering and azimuthal angles at which the scattering intensity is a maximum yields information on the size and shape of the sheaflike texture. The information should be of importance in studies of anisotropic crystal growth caused by molecular orientation in the melt and of the deformation mechanism of the texture. The deformation behavior should be representative of that of different parts of spherulites, at least qualitatively; the deformation of the texture along the machine and transverse directions corresponds to deformation of equatorial and meridional regions of a spherulite, respectively.
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  • 70
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    Journal of Polymer Science: Polymer Physics Edition 15 (1977), S. 523-540 
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: This paper reports of a study on eutectic solidification of the quasi binary system of unfractionated isotactic polypropylene and the dentritic growing diluent pentacrythrityl tetrabromide. This system was characterized by a eutectic-type experimental phase diagram with a eutectic composition of 68% (w/w) of polypropylene. The eutectic temperature was found to depend on kinetics, and was established by differential scanning calorimetry to be 122 and 102°C at a cooling rate of 0.5 and 32°C/min, respectively. A remarkeable nucleating effect of the primary diluent crystals was observed in the solidification of diluted polypropylene solutions. Here the eutectic horizontal was located at a temperature which was 15°C higher than in the eutectic solutions exceeding the temperature at which the pure polymer crystallized from the melt by 8°C. The eutectic microstructures produced were found to depend on the rate of solidification, which was varied by pulling the polypropylene solutions through a fixed temperature gradient of 3°C/mm at different speeds ranging from 0.2 to 80 mm/hr. At rates lower than 3 mm/hr the polymer and the diluent crystallized simultaneously from the eutectic solution in a uncoupled mode of growth, forming a coarse structure of diluent crystals and isotactic polypropylene spherulites with dimensions of about 0.1 mm. At higher speeds the simultaneous crystallization of the macromolecules and solvent molecules proceeded in a co-operative manner with a nonplanar growth front. A rodlike eutectic microstructure was produced, in which diluent rods, lined up in the growth direction, were dispersed in a polypropylene matrix. The lateral dimension λ1 of these rods were found to depend on the growth rate R in the following way: λ12 R = 10-9 mm3/sec, and ranged from 0.3 to 1.0 μm. This was in accord with values calculated by using the current theory of rod eutectic growth of Jackson and Hunt.
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  • 71
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    Journal of Polymer Science: Polymer Physics Edition 15 (1977), S. 605-616 
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Molecular motions in a series of linear aliphatic polyesters [poly(ethylene adipate), poly(ethylene sebacate), poly(hexamethylene sebacate), and poly(decamethylene 1,16-hexadecanedicarboxylate)] were studied by dielectric measurements. Two loss maxima were observed for each polymer in the temperature range from -196 to about 60°C and in the frequency range from 110 to 105 Hz. The loss maxima of these polyesters, lying between -17 and -38°C at 110 Hz (β-relaxation), are due to the micro-Brownian motions of amorphous main chains. It was found that these β-relaxations are well described by the WLF equation. The loss maxima in the range from -88 to -109°C at 110 Hz (γ-relaxation), are attributed both to local mode motions of main chains in the amorphous region and to motions of the polar groups involved at the chain ends. For the β-relaxation, no simple relation between the methylene sequence length and the loss peak temperature was found. Furthermore, as the methylene sequence length decreased, the effective dipole moment of the polyesters increased gradually. These facts were explained in terms of interchain dipole attraction.
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  • 72
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    Journal of Polymer Science: Polymer Physics Edition 15 (1977), S. 641-656 
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Samples of isotactic polypropylene (PP) were zone-solidified in temperature gradients up to 300°C/cm at growth rates down to 3 μm/min. Oriented α-type spherulites were obtained only by nucleation. While β nucleation is extremely rare, the β phase is easily initiated by growth transformations along the oriented α front. Since the β phase was found to grow considerably faster than the α phase, the α-to-β transformation points diverge across the sample, interrupting growth of the oriented α fibrils. This causes subsequent nucleation to yield teardrop-shaped α spherulites.Differential scanning calorimetry (DSC) studies of zone-solidified PP show the β-phase to be favored by slow growth rates, high temperature gradients, and large degrees of superheat in the melt - all of which tend to suppress nucleation. Differential thermograms of largely β-PP obtained at a heating rate of 1°C/min show the actual melting and recrystallization of the β spherulites into the α form.
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  • 73
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    Journal of Polymer Science: Polymer Physics Edition 15 (1977), S. 683-692 
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A theory has been developed to explain the jump in the relative modulus of filled polymers near the glass transition temperature Tg and the subsequent decrease in relative modulus at temperatures above the glass transition temperature. The theory is based upon the concept that there are some particle-particle contacts in doublets and in agglomerates containing a larger number of particles. Below Tg motion of particles at the contact points is possible because of the high modulus of the polymer. At Tg particle-particle motion mostly ceases because of the low modulus of the polymer. At higher temperatures, the mismatch in the coefficients of expansion allows some motion to occur at points of contact and slippage may occur at the polymer-particle interfaces, so the modulus decreases. It is shown theoretically and experimentally that both the elastic modulus and the mechanical damping depend upon the nature of the surface of the particles.
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  • 74
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    Journal of Polymer Science: Polymer Physics Edition 15 (1977), S. 715-722 
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A model is proposed for the electrical polarization that causes the orientation and, hence, the electric birefringence of a suspension containing single crystals of a poly(ethylene oxide)-polystyrene diblock copolymer or a poly(ethylene oxide) homopolymer. It serves to describe how an electric dipole moment lying in the plane of the single crystal can be induced by protons migrating in poly-(ethylene oxide). The resulting Kerr effect is calculated up to saturating fields, and the observed dispersion of the polarization in high frequency fields is explained as a space charge relaxation phenomenon. The estimated relaxation time agrees satisfactorily with published experimental data.
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  • 75
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    Journal of Polymer Science: Polymer Physics Edition 15 (1977), S. 733-748 
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Human transferrin was examined by analytical density gradient equilibrium centrifugation using a short liquid column and employing an iodinated organic gradient salt. Favorable conditions of low pressure and relatively low ionic strength could therefore be obtained. The short liquid column also permitted the layering of extra salt solution above the protein solution in a liquid equalization stage of each experiment. In this stage the amount of preferentially bound water was determined by measurement of solvation arising from the dissolution of the protein which had been added to the centrifuge cell as freeze-dried material. Since schlieren optics were employed, the refractive index of the macromolecular component in the mixed solution had to be known. This quantity was determined from the refractive index difference of the solvent/solution boundary at the liquid equalization stage of each experiment or, alternatively, by regression analysis of the equilibrium data. The new regression method yielded an anhydrous molecular weight of 78,000 daltons which is the same as the value obtained by the classical density gradient equilibrium method performed under the same conditions. Control experiments showed that the analytical ultracentrifuge cell cannot be regarded as a closed, inert system.
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  • 76
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    Journal of Polymer Science: Polymer Physics Edition 15 (1977), S. 767-772 
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: We propose a new method for the investigation of molecular motion in polymeric solids. In a mechanical step-function experiment, we thermally stimulate the response to a constant stress. The high resolving power of this technique permits detailed study of the complex retardation modes observed in polymers. As an example, we consider the thermally stimulated creep of low density polyethylene. The experimental resolution of the thermally stimulated creep spectra shows the existence of elementary processes well fitted by the assumption of single retardation times.
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  • 77
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    Journal of Polymer Science: Polymer Physics Edition 15 (1977), S. 795-804 
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A simple method of measuring the solubility of gases in polymers at elevated temperatures and high gas pressures is described by direct weighing of the sample after cooling to ambient temperatures. Changes in gas content during cooling which would cause errors are largely prevented by nucleating bubbles throughout the samples immediately prior to cooling, with the effect of making the internal partial pressure of gas equal to the external pressure while the polymer is soft and thus preventing gas flux to or from the sample. Results are given for the solubility of nitrogen in branched polyethylene in the temperature range 130-190°C at gas pressures up to 1,030 bar. A kink in the solubility isotherm at temperatures just above the normal crystalline melting point is believed to be caused by a pressure shift of the melting point. Comparison of the results with previous work by Lundberg et al. suggests a systematic error in the latter which reduced the apparent solubility at higher pressures.
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  • 78
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    Journal of Polymer Science: Polymer Physics Edition 15 (1977), S. 837-846 
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The melting point and the heat of fusion were measured by differential scanning calorimetry (DSC) as a function of draw ratio for linear polyethylene. Both the melting point and the heat of fusion increased with an increase in draw ratio. The plot of the heat of fusion against the melting point was approximately linear. The linear relation is explained theoretically using the assumption that the increases in the melting point and the heat of fusion are due to the orientation of the amorphous phase caused by drawing. The excess free energy of the amorphous phase derived from the orientation increases the melting point, and the amorphous phase absorbs heat for its randomization at the melting point. Hence for drawn samples having an oriented amorphous phase not only the crystal phase but also the amorphous phase contribute to the heat of fusion.
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  • 79
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    Journal of Polymer Science: Polymer Physics Edition 15 (1977), S. 907-914 
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Although hydrogen gas is about tenfold more soluble in hot-filtered mats of polyethylene (PE) single crystals (SC) than in bulk linear PE, we found that no hydrogen solubility at all could be measured in freeze-dried SC. Despite this, hydrogen gas still exerts a catalytic effect on alkyl radical decay on both the fast and slow first-order decay reactions in the freeze-dried samples. Above 40°C the first-order decay constants of the slowly decaying component decrease with increasing fold period.
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  • 80
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    Journal of Polymer Science: Polymer Physics Edition 15 (1977), S. 955-967 
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: It has been previously shown that when rigid poly(vinyl chloride) is extended by fully necking the test-piece, subsequent fracture takes place by a novel mechanism. Surface crazes grow into “diamond” -shaped cavities which slowly expand while retaining their shape. We have now found that this new mechanism is of general applicability to a wide range of plastics which fracture after yielding. Examples are given from polycarbonate, poly(ether sulfone), and poly(methyl methacrylate) broken at elevated temperatures. The form of the diamond cavity is determined by the continuation of plastic deformation in the whole test-piece while the diamond grows bigger. After fracture a characteristic cavity is left behind on the fracture surface which demarcates the zone of slow growth. At a given point, which is generally easily observable on the fracture surface, the crack speeds up. This change is believed to correspond to a situation where enough elastic energy is available to propagate a crack. It is favored, not only by the increase in size of the diamond in the test-piece but also by an increase in the average energy stored per unit volume of material.
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  • 81
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    Journal of Polymer Science: Polymer Physics Edition 15 (1977), S. 987-993 
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Thermoluminescence of poly(methyl methacrylate) (PMMA) irradiated with x rays, has been studied in the temperature range 100 to 460°K. Two glow peaks with maxima at 136 and 368°K have been observed. These are analyzed by three methods and the results are compared. Both curves obey second order kinetics and correspond to activation energies of 0.17 and 0.88 eV, respectively. It is possible to identify the centers responsible for the two peaks by correlation with electron spin resonance and optical data obtained for the same samples irradiated under the same conditions. Spectral studies of the emission show that the low temperature peak has its maximum at 365 nm while the high temperature peak has its maximum at 480 nm.
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  • 82
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    Journal of Polymer Science: Polymer Physics Edition 15 (1977), S. 1037-1040 
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The effect of particle size on glass transition temperatures is discussed. The phenomenon is treated in terms of Ehrenfest second-order thermodynamics and in addition related to free volume concepts. Consistent formulas are obtained and the order of magnitude of the effect is estimated.
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  • 83
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    Journal of Polymer Science: Polymer Physics Edition 15 (1977), S. 1067-1075 
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The differential scanning calorimetry (DSC) melting curves of drawn nylon 6 were studied from the standpoint of reorganization of the crystals during the heating process. A new method was presented to obtain the DSC curve associated with the growth and melting of the original crystals, and that with the recrystallization and final melting process, separately. The results obtained show that, in the case of a heating rate of 10°C/min, the original crystals in the sample start perfecting themselves at temperatures far below their initial melting temperature and melt out below 222°C, recrystallization starts at about 210°C, and the newly emerged crystals melt out at 228°C. The superposition of two such constructed DSC curves reproduces the observed DSC curve well. Therefore, the double melting peaks of the sample are considered to be the result of superposition of three processes which occur successively during heating; perfection of the original crystals, melting of the perfected crystals concurrently with recrystallization, and melting of the recrystallized crystals.
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  • 84
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    Journal of Polymer Science: Polymer Physics Edition 15 (1977), S. 1129-1142 
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The effect of molecular weight heterogeneity on the second virial coefficient A2 in good solvents is studied for binary mixtures of monodisperse poly(α-methylstyrenes). It is concluded that A2 for polymer mixtures passes through a maximum with variation of the mixing ration. From comparison with the data, it is concluded that no available theory quantitatively explains both the molecular weight dependence of A2 of monodisperse polymer and the variation of A2 of mixtures with the mixing ratio. The interpenetration function for two polymer coils with different molecular weights is discussed on the assumption that the thermodynamic interaction between two polymer coils in good solvents can be approximated by a hard-sphere model.
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  • 85
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    Journal of Polymer Science: Polymer Physics Edition 15 (1977), S. 1267-1281 
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The anisotropy of thermal conduction in a spherulite is calculated for a two-phase model. The problem of the temperature distribution due to cooling of a spherulite suddenly heated at one point is solved. An analytical result is given and isothermal contours are calculated for wide ranges of thermal conduction anisotropy and cooling time. Experiments with spot-heated isotactic polypropylene (i-PP) and isotactic polystyrene (i-PS) spherulites were conducted using a laser pulse and a needle as heat sources. The isotherms were recorded using a thin coating of a heat-sensitive indicator substance, and then by comparison with theoretical isotherm patterns the heat conduction anisotropy of a PP spherulite was estimated. Additional measurements of heat conduction coefficients of at least two polymer films characterized by different crystallinity permit calculation of the thermal conductivity of the amorphous phase, and the conductivities of single crystals along chains and perpendicular to the chains. The results show that the heat is transferred mainly along the primary bonds of polymer chains. However, the morphology of sperulites and lamellas plays an important role.
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  • 86
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    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 15 (1977), S. 1315-1317 
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 4 Ill.
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  • 87
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    Journal of Polymer Science: Polymer Physics Edition 15 (1977), S. 1339-1345 
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Raman depolarization (ρ) measurements have been made over the temperature range 20 〉 T 〉 60°C for solutions of poly(dimethyl siloxane) (mol wt 7.7 × 104 and 2.0 × 104) for several concentrations up to 100%. The band studied was the highly polarized methyl stretch at 2907 cm-1. Computer calculations of the probability pt of a rotational isomer being trans allow the ρ values to be related to ΔG, the free energy of mixing. ΔG is plotted as a function of concentration and minima are observed at 60 ± 3% (mol wt = 7.7 × 104) and 70 ± 3% (mol wt = 2 × 104).
    Additional Material: 2 Ill.
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  • 88
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    Journal of Polymer Science: Polymer Physics Edition 15 (1977), S. 1397-1407 
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Dielectric constants have been determined for a fraction of poly(diethylene terephthalate) in benzene at several temperatures. The data indicate that the dipole moment ratio 〈μ2〉/Nm2 is somewhat higher than that of poly(ethylene oxide), and its temperature coefficient is in the vicinity of zero. Both the dipole ratio and its temperature coefficient are in very good agreement with those predicted by the rotational isomeric state theory. Using this theory, the unperturbed dimensions of poly(diethylene terephthalate) were calculated and it was found that (〈r2〉/M)∞ = 0.80 Å2 (g mol wt)-1, a value intermediate between those of poly(ethylene oxide) (0.57) and poly(ethylene terephthalate) (1.05).
    Additional Material: 7 Ill.
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  • 89
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    Journal of Polymer Science: Polymer Physics Edition 15 (1977), S. 1451-1473 
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Monomer distributions and number-average sequence lengths are determined from 13C nuclear magnetic resonance (NMR) data for 1,4- and 1,2-butadiene additions and styrene additions in a series of four hydrogenated butadiene-styrene copolymers. The monomer distribution is expressed in terms of the six unique days from which it is possible to calculate the number-average sequence length of each monomer type. Carbon-13 NMR spectral assignments are given and the techniques for making the assignments are discussed. The method presented could, in principle, be applied to any copolymer or terpolymer. Limitations that are encountered in the analysis of hydrogenated butadiene-styrene copolymers high in 1,2 additions are discussed.
    Additional Material: 6 Ill.
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  • 90
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    Journal of Polymer Science: Polymer Physics Edition 15 (1977), S. 1507-1520 
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A differential scanning calorimeter (DSC) was used to study the melting behavior of drawn nylon 6 yarns which were prevented from shrinking during heating. The DSC curves exhibit a single melting peak at a higher temperature instead of the double peaks which, as reported previously, were observed in the unconstrained state. The curve is explained quantitatively in terms of the perfecting of the original crystals followed by monotonic melting of these crystals during heating. The single peak results from the absence of the partial melting-recrystallization process which plays an important role in the appearance of double peaks. The temperature of the melting peak for the constrained sample increases linearly with draw ratio, and is unaffected by drawing temperature and by annealing at constant length after drawing. The elevation of the melting temperature is discussed on the basis of the entropy effects predicted theoretically by Zachmann. Thermal analysis of constrained samples has proved to be useful for detecting oriented crystals which coexist with unoriented ones.
    Additional Material: 13 Ill.
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  • 91
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    Journal of Polymer Science: Polymer Physics Edition 15 (1977), S. 1647-1654 
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The infrared spectra of polyethylene single crystals suspended in liquid are reported and compared to dried mats of the same material. In order to observe the polyethylene bands, liquids with partial windows in complementary regions of the spectra were chosen. Any remaining bands of the suspending media were removed by substraction of the spectrum of the pure liquid. The crystalline bands of suspended polyethylene are much sharper than those of the dried material, indicating a decrease in lateral crystalline order upon drying. Drying also results in a change in the type and distribution of conformations associated with amorphous and fold structures, as determined by the observed frequencies of the methylene wagging mode.
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  • 92
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    Journal of Polymer Science: Polymer Physics Edition 15 (1977), S. 1675-1683 
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The thermal behavior of films of amorphous silk fibroin in the random-coil conformation has been investigated in the temperature range 25-220°C by differential scanning calorimetry (DSC), thermal expansion, dynamic mechanical measurements, x-ray diffraction, and infrared spectroscopy. As the temperature is raised, water is lost up to about 100°C. Intramolecular and intermolecular hydrogen bonds are broken between 150 and 180°C. The glass transition is observed at 173°C by DSC. The random-coil→β-form transition accompanied by reformation of hydrogen bonds takes place above 180°C. Thermally induced crystallization to the β-form crystals starts at about 190°C.
    Additional Material: 8 Ill.
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  • 93
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    Journal of Polymer Science: Polymer Physics Edition 15 (1977), S. 1757-1767 
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: From glass transition Tg measurements on isotactic polystyrene (IPS)-poly(2,6-dimethyl phenylene oxide) (PPO) blends, it was concluded that thoroughly annealed, freeze-dried samples, or samples evaporated from solution at high temperature, are homogeneous. Without annealing, the freeze-dried blends show two to three Tg's characteristic of the presence of different phases. The overall crystallization rate of these samples is much higher than that observed with annealed samples. The presence of dissolved PPO in annealed samples reduces the overall crystallization rate and the spherulitic growth rate, compared to IPS. The melting behavior of the blends is influenced by the extent of mixing of both polymers. Without annealing, isothermally crystallized, freeze-dried blends show the same melting behavior as IPS (i.e., multiple melting). In homogeneous annealed samples the rate of reorganization is strongly reduced and multiple melting only occurs at low scanning rate (e.g., 1°C/min). This behavior is influenced by the crystallization temperature and by the composition of the blends. The addition of PPO has no influence on the relation between melting point and crystallization temperature and the same equilibrium melting point is found by extrapolation.
    Additional Material: 9 Ill.
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  • 94
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    Journal of Polymer Science: Polymer Physics Edition 15 (1977), S. 1837-1861 
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Energy-deformation characteristics for the primary T, S, and U conformational units of tie molecules were obtained from the analysis of data generated from a constrained minimization algorithm. Energy-deformation profiles (covering the range from compact equilibrium defect structures to the fully extended chain) are reported for the S0 and S1 members of the Sλ family and for the U00 member of the Umn family. Estimates of the energy content V0 and the elastic modulus E were obtained from the computed energy-deformation data in the vicinity of the equilibrium Structure - S0 → {60°, 180°, -60°}, V0S0 = 1.7 kcal/mole, ES0 = 60 kcal/cm3 [250 × 1010 dyn/cm2];S1 → {60°, 180°, 180°, 180°, -60°}: V0S0 = 1.7 kcal/mole, ES1 = 25 kcal/cm3 [100 × 1010 dyn/cm2]; and U00 → {60°, 180°, 60°, 180°, 60°}: V0U00 = 2.7 kcal/mole, EU00 = 80 kcal/cm3 [340 × 1010 dyn/cm2]. Although the elastic modulus of the U00 unit is comparable to the elastic modulus of the fully extended chain, the highenergy content of this unit (V0 = 2.7 Kcal/mole) prohibits a significant population and thereby mitigates an appreciable reinforcing effect from this rigid unit. A model for a surrogate force constant is introduced to generalize the results from this study to any member of the Sλ or Umn family as well as any combination of Sλ and Umn units. This generalization provides a basis for estimating the deformation characteristics of tie molecules comprised of various populations of these primary conformational building blocks.
    Additional Material: 10 Ill.
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  • 95
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    Journal of Polymer Science: Polymer Physics Edition 15 (1977), S. 1913-1925 
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Ultraviolet and Fourier-transform infrared spectroscopy are used to characterize the chain conformation of 2,6-dimethyl poly(phenylene oxide) (2MPPO) in compatible 2MPPO-polystyrene (PS) blends. Blending with PS increases the intramolecular energy of the 2MPPO. Atactic PS induces a greater distortion from the minimum energy conformation of 2MPPO than isotactic PS. The dispersion interaction between the phenyl ring of PS and the phenylene ring of 2MPPO is found to be quite strong. These large intermolecular forces are thought to supercede the increase in 2MPPO conformational energy and to be responsible for the blend compatibility.
    Additional Material: 9 Ill.
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  • 96
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    Journal of Polymer Science: Polymer Physics Edition 15 (1977), S. 1967-1982 
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The intensity of the water-induced γ relaxation (see ref. 1) in crosslinked polyester networks in creases rapidly at low water concentrations (0 to 0.5% by weight). At higher water concentrations (0.5 to 3.0%) the intensity of the γ relaxation approaches a constant value. The shift of the relaxation peak to lower temperatures shows a similar pattern of behavior. These results have been related to the fraction of water involved in the relaxation and the changing nature of the relaxation sites with the increase in water concentration. The important role that fumarate units play in the γ relaxation has also been confirmed; however, the chemical nature of the relaxing unit appears to be more complex than was originally considered. Two models are proposed for this behavior.
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  • 97
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    Journal of Polymer Science: Polymer Physics Edition 15 (1977), S. 2027-2031 
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 3 Ill.
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  • 98
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    Journal of Polymer Science: Polymer Physics Edition 15 (1977), S. 2037-2038 
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 1 Ill.
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  • 99
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    Journal of Polymer Science: Polymer Physics Edition 15 (1977), S. 2055-2056 
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 1 Tab.
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  • 100
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    Journal of Polymer Science: Polymer Physics Edition 15 (1977), S. 2087-2093 
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Interactions of water-soluble AB block copolymers of polystyrene and poly(ethylene oxide) with sodium lauryl sulfate (SLS) in aqueous solution were investigated by high-resolution proton magnetic resonance (NMR). The viscosity in aqueous SLS solution was also measured. From the NMR results in D2O, it appears that molecular motions of the polystyrene blocks of the copolymer in aqueous solution are activated by interaction between the polystyrene blocks and the added SLS. From solution viscosity, on the other hand, it is apparent that a complex is formed between the copolymer and SLS and that it exhibits typical polyelectrolyte properties. The polyelectrolyte character is attributable largely to intrachain repulsions between like charges of the SLS anions adsorbed on the poly(ethylene oxide) blocks of the copolymers since the polystyrene blocks are insoluble in water and the styrene content is less than 10%.
    Additional Material: 6 Ill.
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