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  • 2005-2009
  • 1975-1979  (9)
  • 1940-1944
  • 1975  (9)
  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Analytical chemistry 47 (1975), S. 2238-2243 
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Table 1 Effect of callosal section on rotation induced by (+)-amphetamine (1.0 mg kg"1) Mean net rotations ± s.e. per 1 h Group Preoperative Postoperative Callosal 48.2±14.6 97.7±12.2* Sham 46.8±14.5 49.0±15.1 *Significantly different from preoperative ...
    Type of Medium: Electronic Resource
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  • 3
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    Unknown
    Salt Lake City : Periodicals Archive Online (PAO)
    Political Research Quarterly. 28:2 (1975:June) 372 
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Journal of comparative physiology 103 (1975), S. 227-245 
    ISSN: 1432-1351
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The Photoperiodic Determination Model proposed earlier (I, II) is further elaborated, and its applicability to nondiel photoperiods tested. Model-generated predictions of diapause incidences were in good agreement with observed incidences among larvae of the European corn borer,Ostrinia nubilalis, reared under photoperiods from 15 to 50 hrs duration with scotophases of from 9 to 18 hrs.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Psychopharmacology 40 (1975), S. 329-334 
    ISSN: 1432-2072
    Keywords: Apomorphine ; Rotation ; Caudate Lesions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Apomorphine (i.p.) induced rotational behavior (i.e. circling) in normal unoperated rats. This rotation increased with increasing dose up to 10.0 mg/kg, after which the dose-response curve appeared to plateau. Although there was large variability among rats, rotation for each rat was consistent in both direction and magnitude from week to week. Rotation was not antagonized by alpha-methyl-para-tyrosine. When rats with unilateral lesions of the caudate nucleus were tested with apomorphine, postoperative rotation was significantly influenced by the direction of preoperative rotation; rats rotated more postoperatively if the lesion was made ipsilateral rather than contralateral to their preoperative direction of rotation. These results suggest that there is a bilateral asymmetry of dopaminergic receptors in the nigro-striatal pathways of normal rats.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Entomologia experimentalis et applicata 18 (1975), S. 1-16 
    ISSN: 1570-7458
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung Die gebräuchlichen Techniken zur Zucht von pflanzensaugenden Insekten an künstlichen Diäten können nur relativ kleine Populationen liefern. Darüber hinaus hat der manuelle Aufwand, der für die Unterhaltung laufender Kulturen verschiedener Versuchsgruppen erforderlich ist, Ernährungsversuche mit pflanzensaugenden Insekten begrenzt. Zur Verbesserung dieser Situation wurde ein automatisches Zuchtsystem für laufende Zuchten der Erbsenlaus an holidischen Diäten konstruiert. Dieses System besteht aus Gefrierkammern, Diätflaschen, Verteilernetz, Pumpen und Diätkammern. Diese letzteren sind Teflonscheiben mit Rinnen, die als Doppelspiralmuster in eine der Oberflächen eingegraben sind. Daraus wird ein membranbedeckter Kanal durch Überziehen der Doppelspirale mit Parafilm. Durch diese Kanäle wird dreimal die Woche Diät gepumpt. Ein programmierbarer Zeitgeber regelt das System über längere Zeit hin. Dabei lassen sich Eintritt, Dauer und Reihenfolge der Abläufe leicht programmieren. Nur einmal in zwei Wochen müssen leere Flaschen durch volle ersetzt und alte Diätkammern durch neue ausgetauscht werden. Blattläuse können an den im System angeschlossenen Diätkammern leicht beobachtet werden; ebenso gut können diese Kammern, wenn nötig, für eine Inspektion vom System abgenommen werden. Das hier beschriebene automatische Zuchtsystem besitzt grosse technische Vorteile für die Massenproduktion von saugenden Insekten. Der hier entwickelte Zeitgeber ist verwendbar für die Automation von Systemen, die zu komplex für konventionelle Zeitgeber sind, aber auch nicht die Kapazitäten eines Prozessrechners erfordern.
    Notes: Abstract Current techniques for rearing plant-sucking insects on artificial diets can support only relatively small populations. Moreover, the manual effort required to maintain continuous cultures of several experimental groups has limited nutritional research on plant-sucking insects. To alleviate these problems, an automated-rearing system was devised to maintain continuous cultures of the pea aphid, Acyrthosiphon pisum, on holidic diets. The automated system is comprised of freezers, diet bottles, distribution networks, pumps, and diet chambers. The latter are Teflon® discs with grooves cut in a double-spiral pattern on one face. A membrane-covered channel is formed by bonding Parafilm® over the double spiral. Diet is pumped through the channels of the diet chambers three times a week. A programmable sequence timer controls the system for extended periods of time. The occurrence, duration, and order of the sequences may be easily reprogrammed. Once every 2 weeks, the system requires replacing empty bottles of diet with full ones and exchanging new diet chambers for old ones. Aphids are easily inspected with the diet chambers connected to the system or, if desired, the diet chambers can be disconnected for inspection away from the rearing facility. The automated-rearing system described here should be a great technological asset for the mass production of haustellate insects. The timer developed for the system is applicable for the automation of systems that are too complex for conventional timers but do not require the capabilities of process-control computers.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1432-0878
    Keywords: Blood-brain barrier ; Moth ; Diapause ; ATPase ; Peroxidase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Ultrastructural examination of diapause and nondiapause larval brains of the European corn borer disclosed anatomical differences that may be related to the insect's “blood-brain barrier.” The perineurial type I cells are quite closely appressed in the diapause brain, but thrown into extensive folds with large intercellular spaces in the nondiapause brain. The perineurial type II cells of diapause and nondiapause larvae are basically similar in general ultrastructure, and most likely form the basis for the “blood-brain barrier.” Horseradish peroxidase penetration studies indicated that the outer margin of the perineurial type II cells constitute the limits of infiltration into the brain. An enzymatic component of the “blood-brain barrier” is postulated in this insect. The localization of ATPase in the perineurial type II cells indicates that energy-requiring regulatory mechanisms may be localized here. Metabolic studies with isolated insect brains, coupled with recent evidence from mammalian systems, suggest that glial cells may be of importance in an enzymatic “blood-brain barrier.”
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 159 (1975), S. 351-367 
    ISSN: 1432-0878
    Keywords: Symbiotes ; Aphids ; Vesicles ; Organelles ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary A detailed investigation into the ultrastructure of the pea aphid mycetocytes and their contained symbiotes and organelles was carried out with the transmission electron microscope. The most striking observation was the presence of small vesicles in the space between the primary symbiote cell wall and membrane envelope (outer membrane space). The vesicles appear to form by a budding process at the outer cell wall layer. Subsequently, the vesicles, we suggest, may move out into the mycetocyte cytoplasm via a similar budding of the membrane envelope. The Golgi apparatus was found to be an important structural component of the primary mycetocyte; it is continuous with the rough endoplasmic reticulum and the latter, in turn, appears to be closely connected to the primary symbiote membrane envelope. This may be of functional significance. A number of other organelles not previously described in mycetocytes were found, including transparent vacuoles, granular bodies, multivesicular bodies and microfilaments. The chemical composition of the various vesicles and organelles is unknown at present.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 159 (1975), S. 379-385 
    ISSN: 1432-0878
    Keywords: Compound eye ; Musca domestica ; Ommatidium ; Distal retinula ; Scanning electron microscopy ; Corneal lens ; Corneal pigment cell ; Pseudocone ; Semper cell ; Basement membrane
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The distal aspect of the housefly ommatidium was surveyed by the scanning electron microscope. Attention was directed to the somal eminence of the superior central cell and the lens to large pigment cell junction. The underside of each lens facet exhibits six hexagonally arranged incisures. Into each of these indentations are fitted several large pigment cells. This hexagonal indentation appears to be a tenacious anchorage. Two corneal pigment cells laterally encircle the pseudocone and at their proximal extension they enclose the Semper cells and neck of the retinula. The somal eminence of the superior central cell is about 10 μm from the base of the corneal pigment cell enclosure. Micrographs were used to construct a diagram of the ommatidium above the basement membrane. Suggestions are made as to the functional correlates of the observed ommatidial structures.
    Type of Medium: Electronic Resource
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