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  • 1995-1999
  • 1975-1979  (28)
  • 1976  (28)
  • Engineering  (16)
  • Rat  (12)
  • Magnetic resonance imaging
  • 1
    Electronic Resource
    Electronic Resource
    Ultrastructural study on the hypothalamic-hypophysial-adrenal axis in fetal rats (1976)
    Springer
    Cell & tissue research 168 (1976), S. 549-559 
    Details
    ISSN: 1432-0878
    Keywords: Hypothalamic-hypophysial-adrenal axis ; Rat ; Development ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The adrenal glands of decapitated and encephalectomized fetal rats were investigated electron microscopically and compared to those of normal intact fetal rats. Although the adrenal cortices did not show three zones (zona glomerulosa, fasciculata, and reticularis) on the 16.5th day of gestation when the decapitation or encephalectomy was carried out in utero, the zonation was recognized in fetuses operated on the 21.5th day of gestation. The same was true for normal control fetuses. However, cytoplasmic characteristics suggesting steroidogenesis in the cortical cells were reduced to various degrees in the encephalectomized or decapitated fetuses, especially in the latter ones. The change in cytoplasmic appearance was more conspicuous in the inner portion of the cortex. This result suggests that for the maintenance of normal adrenocortical function the hypothalamus may be indispensable even during the prenatal life of rats.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00216002
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  • 2
    Electronic Resource
    Electronic Resource
    Technical note: Horizontally curved beam finite element including warping (1976)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 10 (1976), S. 1397-1403 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620100618
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  • 3
    Electronic Resource
    Electronic Resource
    Input from trigeminal cutaneous afferents to neurones of the inferior olive in rats (1976)
    Springer
    Experimental brain research 26 (1976), S. 193-202 
    Details
    ISSN: 1432-1106
    Keywords: Inferior olive ; Trigeminal nerve ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Extracellular recordings were obtained from inferior olivary neurones of the rat. The responses of fifty neurones evoked by electrical stimulation of a branch of the trigeminal nerve were recorded. Maxillary nerve stimulation was most effective. The response was characterized by an early discharge (single spike and wave, typically with latencies between 16 and 30 msec) and a weak late discharge which followed a period of inhibition of about 100 msec. Half of the neurones responded to one branch of the trigeminal nerve only whereas the other neurones displayed a varying degree of convergence, including sometimes a convergence from limb nerves. Forty-nine olivary neurones were tested for cutaneous receptive fields. Ten out of these had small receptive fields (〈20% of the contralateral face) and a low threshold to mechanical stimuli. Twenty neurones which had larger receptive fields responded also to low-threshold or to medium-threshold (i.e. non-nociceptive) mechanical stimuli. None of the neurones displayed receptive fields more extensive than half of the contralateral face and some of the larger fields had a small, low-threshold focus. Olivary neurones responding to electrical stimulation of trigeminal nerves or mechanical stimulation of the face were located in the medial segment of the olivary complex (dorsal accessory and principal olive). A few cells only were located in the lateral segment. It is concluded that neurones of the inferior olive receive a substantial input from trigeminal afferents and are capable of transmitting precise somatotopical information to the cerebellum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00238283
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  • 4
    Electronic Resource
    Electronic Resource
    Surface features of cirrhotic liver (1976)
    Springer
    Virchows Archiv 372 (1976), S. 97-108 
    Details
    ISSN: 1432-2307
    Keywords: Scanning electron microscopy ; Cirrhosis ; Liver ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The surface features of single cells and of multicellular tissue units in cirrhotic rat livers have been studied by scanning electron microscopy (SEM). Cirrhosis of the liver was produced in rats by simultaneously treating them with carbon tetrachloride and sodium phenobarbital. Connective tissue septa consisted of a loose mesh-work of fibers in which fibroblasts were embedded. The arrangement and surface features of hepatocytes in cirrhotic nodules differed from those found in parenchyma of normal livers. Hepatocytes in cirrhotic nodules universally formed plates two cells thick. The portion of the hepatocyte surface covered by microvilli was greatly increased in cells from cirrhotic livers, and this was reflected in a corresponding reduction in the area occupied by the smooth-surfaced narrow intercellular space. Canaliculi between hepatocytes in cirrhotic livers were reduplicated and frequently branched. Hepatocyte surfaces covered by microplicae and flattened microvilli, typical of connective tissue-facing surfaces in normal livers, were greatly increased in cirrhotic livers corresponding to the increase in connective tissue. Where hepatocytes directly contacted fibroblasts (and not fibers), their surfaces were entirely smooth. Sinusoidal endothelial cells in cirrhotic livers contained only isolated, relatively sparse pores, and they lacked both sieve plates (pore complexes) and large fenestrations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00427085
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  • 5
    Electronic Resource
    Electronic Resource
    Simultaneous changes of the perivascular contact area and HIMOT activity in the pineal organ after bilateral adrenalectomy in the rat (1976)
    Springer
    Anatomy and embryology 149 (1976), S. 297-305 
    Details
    ISSN: 1432-0568
    Keywords: Pineal organ ; Perivascular contact ; HIOMT ; Median eminence ; Adrenal cortex ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In the pineal organ of the female rat, proportional changes in the area of contact of pinealocyte processes and glial processes with the perivascular space were found after bilateral adrenalectomy. The contact area was evaluated by measuring the length of pinealocyte and glial cell membranes directly abutting on the basal lamina. In the normal female rat, 40% of the contact area is occupied by pinealocyte and 60% by glial cell processes. Fourteen days after bilateral adrenalectomy, this proportion is reversed. In addition, cell counts demonstrate that more pinealocytes gain access to the pericapillary space due to the experimental conditions. In order to prove whether or not these results indicate an increase of pineal endocrine activity, the melatonin-forming enzyme hydroxyindole-O-methyltransferase (HIOMT, E.C. 2.1.1.4) was assayed. After bilateral adrenalectomy the HIOMT activity was found to significantly increase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00315445
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  • 6
    Electronic Resource
    Electronic Resource
    A comparison of the central actions of prostaglandins A1, E1, E2, F1α, and F2α in the rat (1976)
    Springer
    Psychopharmacology 50 (1976), S. 89-94 
    Details
    ISSN: 1432-2072
    Keywords: Prostaglandins A1, E1, E2, F1α, F2α ; Intraventricular administration ; Rat ; Behavior
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The effect of prostaglandins (PGs) A1, E1, E2, F1α, and F2α administered intraventricularly at doses of 0.02–4.0 μg/rat were studied in some behavioral, antinociceptive and anticonvulsant tests in rats. Exploratory and locomotor activity were decreased by all PGs except A1 and F2α which had no effect on locomotor activity. All PGs studied, except A1, induced hyperthermia and afforded protection in the ‘hot-plate’ analgesic test and against maximal electroshock seizures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00634161
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  • 7
    Electronic Resource
    Electronic Resource
    Changes of plasma volume and plasma composition in water-deprived rats (1976)
    Springer
    Pflügers Archiv 365 (1976), S. 191-196 
    Details
    ISSN: 1432-2013
    Keywords: Plasma volume ; Protein ; Electrolytes ; Dehydration ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Plasma volume, hematocrit, protein and electrolyte concentrations in plasma were measured in control and water-deprived rats every three days after starting the experiment until the 15th day. Plasma volume variations, as related to body weight, suggest that water loss from plasma was proportional to total body water at three days and after 9 days of water deprivation. Greater plasma water than body water loss was found during the period between 3 and 9 days. Plasma protein and electrolyte variations suggest that during water deprivation there is a loss of protein, sodium and potassium from plasma, which is proportionally less than that of plasma water. Potassium, calcium and inorganic phosphorus were lost proportionally to plasma water. The variations in plasma volume changes were partially explained as due to variations in plasma protein and electrolyte concentrations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01067018
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  • 8
    Electronic Resource
    Electronic Resource
    Functional and anatomical characteristics of the nerve-brown adipose interaction in the rat (1976)
    Springer
    Pflügers Archiv 365 (1976), S. 9-14 
    Details
    ISSN: 1432-2013
    Keywords: Brown adipose tissue ; Adipose innervation ; Rat ; Nonshivering heat production
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Two aspects of the coupling of neural information to brown fat thermogenesis were examined—namely, the thermal responses to increasing neural stimulation and the anatomical nature of the brown fat innervation. Upon stimulation of the nerves to the interscapular brown fat pad, there ensued a biphasic response. This response was manifested by an initial, but transient temperature decrease, followed by a rise in brown fat temperature. The magnitude of both components of this response increased with increasing stimulus strength, thereby demonstrating the ability of the tissue to respond in a graded manner—a feature which may underlie the controlled thermogenic response of brown fat observed in the cold-exposed intact animal. No anatomically unique fiber types appeared to be specifically associated with innervation to the brown adipocytes or to the vessels within the fat pad. On the other hand, the nerves entering the interscapular fat pad were morphologically dissimilar, a finding consonent with their functional dissimilarity (i.e., innervation of adipocytes, innervation of blood vessels in the fat pad, and innervation of areas in the overlying skin).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00583622
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  • 9
    Electronic Resource
    Electronic Resource
    Circadian rhythm of the renin-angiotensin-aldosterone system in the rat (1976)
    Springer
    Archives of toxicology 36 (1976), S. 305-316 
    Details
    ISSN: 1432-0738
    Keywords: Circadian rhythm ; Renin ; Aldosterone ; Corticosterone ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Der 24 Std-Verlauf der Plasma-Renin-Aktivität (PRA), der Plasma-Aldosteron-Konzentration (PAC), der Plasma-Corticosteron-Konzentration (PCC) sowie der Urinexkretion von Natrium, Kalium und Aldosteron wurde an männlichen Sprague-Dawley-Ratten unter verschiedenen experimentellen Bedingungen untersucht. Die Ergebnisse lassen sich wie folgt zusammenfassen: 1. Das Renin-Angiotensin-Aldosteron-System (RAAS) der Ratte weist einen zirkadianen Rhythmus auf, der dem gut bekannten Rhythmus des Hypophysen Nebennierenrinden-Systems parallel läuft. Dieser Rhythmus läßt sich durch Messung der PRA, der PAC und der Exkretionsrate von Aldosteron im Urin nachweisen. Der Rhythmus der Elektrolytausscheidung im Urin scheint nicht durch den Rhythmus der Aldosteronsekretion bedingt zu sein. 2. Der Licht-Dunkel-Zyklus ist der Zeitgeber für diese Rhythmen: Eine Umkehr des Licht-Dunkel-Zyklus für 5 Wochen bewirkt eine komplette Umkehr der Rhythmen aller genannten Parameter. 3. Unter Natrium-Restriktion oder Dexamethason-Behandlung wird eine Dissoziation des Rhythmus der PRA von dem der PAC beobachtet, während der Rhythmus der PAC unter allen Versuchsbedingungen mit dem der PCC parallel geht. Diese Beobachtung legt den Schluß nahe, daß das ACTH an der Steuerung des Rhythmus der Aldosteronsekretion beteiligt ist. 4. Der Grad der Stimulierbarkeit bzw. Supprimierbarkeit des RAAS unterliegt tageszeitlichen Schwankungen. 5. Es wird daher empfohlen, bei Untersuchungen über das RAAS der Ratte die Experimente nicht nur während der Inaktivitätsperiode (Lichtphase), sondern auch während der Aktivitätsperiode (Dunkelphase) dieser Tiere durchzuführen. Dies läßt sich durch Benutzung eines Tierstalls mit umgekehrtem Licht-DunkelZyklus vereinfachen.
    Notes: Abstract The 24 h-course of plasma renin activity (PRA), plasma aldosterone concentration (PAC), plasma corticosterone concentration (PCC) and of the urinary excretion of sodium, potassium and aldosterone was investigated in male Sprague-Dawley rats under different experimental conditions. The data obtained can be summarized as follows: 1. The renin-angiotensin-aldosterone system (RAAS) of the rat is subject to a circadian rhythm which is largely in phase with the well-known rhythm of the pituitary-adrenal axis. This rhythm can be demonstrated in PRA as well as in plasma concentrations and urinary excretion rates of aldosterone. The rhythm of urinary excretion of electrolytes is unlikely to be due to the rhythm of aldosterone secretion. 2. The light-dark cycle is the main synchronizer for these rhythms: inverting the light-dark cycle for 5 weeks entirely inverts the rhythms of all the parameters cited. 3. A dissociation of the rhythms of PRA and PAC can be observed following sodium restriction or dexamethasone treatment. A role of ACTH in regulating the rhythmic pattern of aldosterone secretion is suggested by the finding that PAC and PCC follow the same pattern of circadian variations under every experimental condition tested. 4. The responsiveness of the RAAS to stimulation or suppression varies with the time of day. 5. It is suggested that experiments ought to be performed not only during the inactive (light hours) but also during the active (dark hours) phase when investigating the RAAS in the rat. This can conveniently be achieved by the use of an animal room with a reversed lighting regime.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00340536
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  • 10
    Electronic Resource
    Electronic Resource
    Dichlorvos — a 2-year inhalation carcinogenesis study in rats (1976)
    Springer
    Archives of toxicology 35 (1976), S. 281-294 
    Details
    ISSN: 1432-0738
    Keywords: Dichlorvos ; Inhalation toxicity ; Rat ; Carcinogenesis ; Dichlorvos ; Inhalation-Toxizität ; Ratte ; Karzinogenese
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung In den vorliegenden Untersuchungen wurde der Effekt von Dichlorvos-Inhalation in Beziehung zur Krebserzeugung bei Ratten (5 Wochen alte Carworth Farm E, 94–150 g) langfristig (2 Jahre) in Konzentrationen von 0, 0,05, 0,5 und 5 mg/m3 geprüft. Das Wachstum aller geprüften Tiere, im besonderen der männlichen, war verzögert. Bei Exposition in 5 mg/m3 war die Überlebensrate von Ratten erhöht. Die verschiedenen Gruppen zeigten keinen Unterschied in Futteraufnahme, Organgewichten, hämatologischen oder chemischen Bestimmungen, mit Ausnahme der Cholinesterase-Aktivität. Nach einer 2jährigen Inhalation wurden keine Unterschiede des Gehaltes an Acetylcholin und Cholin in einer kleineren Zahl weiblicher Tiere gefunden. Makro- oder mikroskopische Veränderungen in den Rattengeweben, die auf Dichlorvos zurückzuführen wären, wurden nicht beobachtet. Auch die Ultrastruktur der Lungengewebe von Kontrollratten und der Ratten in 5 mg/m3 zeigte keine Veränderungen, die von Dichlorvos abhängig waren. Die Ergebnisse einer “relative risk analysis” der vorliegenden Tumorversuchsreihe haben keine dosisabhängige Erhöhung des Tumorrisikos für Ratten beider Geschlechter gezeigt. Die Befunde sind in Übereinstimmung mit früheren und sprechen für die Unbedenklichkeit des Gebrauchs von Dichlorvos als Insektizid.
    Notes: Summary To determine the effects of dichlorvos vapour on the tumour incidence in rats, 5 week old Carworth Farm E strain rats weighing between 94 and 150 g were exposed to 0, 0.05, 0.5 and 5.0 mg/m3 in a 2-year inhalation study. The growth rate of all treated rats was depressed, particularly in the males. There was increased survival of the rats exposed to 5 mg/m3. There were no consistent differences in food intakes, organ weights, haematological or blood chemistry estimations, except in cholinesterase activities, amongst the various groups of rats. No compound-related differences were seen in acetylcholine and choline estimations carried out on a small number of female rats' brain tissues after two years' exposure. There were no gross or microscopical compound-related changes in the rats' tissues. Ultrastructural examination of the respiratory tissues of the rats from the control and 5 mg/m3 group showed no changes attributable to dichlorvos. The results of a relative risk analysis of the tumour data showed that no dose-related increase in tumour risk was established for rats of either sex. These data confirm the results of earlier studies supporting the safety of insecticidal uses of dichlorvos.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00570270
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