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  • 1
    Electronic Resource
    Electronic Resource
    Rapid non-genomic effect of glucocorticoid metabolites and neurosteroids on the γ-aminobutyric acid-A receptor (2005)
    Oxford, UK : Blackwell Science Ltd
    European journal of neuroscience 21 (2005), S. 0 
    Details
    ISSN: 1460-9568
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Glucocorticoids and neurosteroids, such as allopregnanolone and tetrahydrodeoxycorticosterone, are released during stress. A non-genomic effect of glucocorticoids has been established but is not yet fully understood. We have studied the effect of glucocorticoid metabolites on the γ-aminobutyric acid (GABA) system. In these experiments we studied the effects of the glucocorticoid metabolites allotetrahydrocortisol, tetrahydrocortisol, allotetrahydrocortisone and tetrahydrocortisone in rat cortical microsacs. Our results showed that both these cortisol and cortisone metabolites reduce GABA-mediated chloride ion uptake. This reduction was not observed in the presence of allopregnanolone but allotetrahydrocortisol interacts with allopregnanolone, enhancing the allopregnanolone-stimulated potentiation of GABA-mediated chloride ion uptake. This enhanced effect was completely blocked by the addition of 30 µm of the 3β-isomer of allopregnanolone, isoallopregnanolone. Our findings show that steroids released during stress interact with each other and GABA in the GABA system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1460-9568.2005.04047.x
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  • 2
    Electronic Resource
    Electronic Resource
    Catecholamine-containing nerve fibres in the hind-gut of the crayfishAstacus astacus L. (Crustacea, decapoda) (1968)
    Springer
    Cellular and molecular life sciences 24 (1968), S. 1159-1160 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Zusammenfassung Katecholamin enthaltende Nervenfasern im Enddarm vonAstacus astacus (L.) werden mit Hilfe vonFalcks undHillarps spezifischer Fluoreszenzmethode gezeigt. Die Fasern, die eine grüne Fluoreszenz abgeben, wurden in Nervenplexen der zirkulären und der längsgehenden Muskelschichten des Darmes beobachtet. Es wird angenommen, dass diese Fluoreszenz durch Noradrenalin zustande kommt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02147826
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  • 3
    Electronic Resource
    Electronic Resource
    Distribution, size frequencies and maturity stages of krill, Euphausia superba, in relation to sea-ice in the Northern Weddell Sea (1990)
    Springer
    Polar biology 10 (1990), S. 549-557 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The spring (November) and early summer (December) distribution pattern and demography of Euphausia superba in the seasonally ice covered areas of the north-western Weddell Sea are described. Sampling with a Rectangular Midwater Trawl (RMT) and during SCUBA diving were undertaken in the pack-ice during the EPOS expedition 1988/1989 of RV Polarstern. These data were compared with former cruises during late winter (October) and summer (February). The biomass values of krill (1–27 g/m2) in the water column within the ice covered areas were of the same order of magnitude as earlier acoustic estimates in the ice-edge region of the same area. No significant correlation between percentage ice cover and krill abundance in the water column was found. Cluster analyses of size frequency distributions and maturity stage composition revealed the demography of the animals sampled. Samples obtained by SCUBA and RMT are compatible and results show a geographic and demographic separation of the krill. It is proposed that krill in the northern zone are largely emigrants from the Bellingshausen Sea, while the krill in the southern zone are of eastern Weddell Sea origin. Further studies concentrating on the under-ice distribution of krill are recommended.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00233705
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  • 4
    Electronic Resource
    Electronic Resource
    A redescription of Onisocryptus sagittus Schultz 1977 (Epicaridea, Cryptoniscina) with notes on hosts, distribution and family relationships (1983)
    Springer
    Polar biology 2 (1983), S. 87-94 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The cryptoniscus larva of the mainly Antarctic species Onisocryptus sagittus Schultz 1977 is redescribed. It has now been found on ostracod hosts of the genera Metavargula and Vargula. Besides being found in the area of the Drake Passage it has been recorded from the Argentine Basin (35 specimens) and the outer Gulf of Biscay (three specimens). The genus Onisocryptus is also recognized to contain a Japanese species O. ovalis (Shiino 1942). The family Cyproniscidae now comprises two genera, Cyproniscus and Onisocryptus, and five species. A further revision of the family is needed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00303173
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  • 5
    Electronic Resource
    Electronic Resource
    Behavior of maximal functios inR n for largen (1983)
    Springer
    Arkiv för matematik 21 (1983), S. 259-269 
    Details
    ISSN: 1871-2487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02384314
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