ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • 1985-1989  (1)
  • 1980-1984  (2)
Collection
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 25 (1984), S. 0 
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The effect of short-term, experimentally-induced stress on the branchial water permeability of Oreochromis niloticus was studied. Both handling and thermal stress increased water permeability but apparently by different mechanisms. The enhancement of water permeability by acclimation temperatures and acute temperature changes had Q10 of 3.52 and 2.24 respectively. Environmental sodium concentration and acute hypoxia had no effect while hypercapnia and mild anaesthesia decreased water permeability. Both hypercapnia and mild anaesthesia probably elevated arterial pCO2 with a concomitant reduction of metabolism.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Higher education 14 (1985), S. 17-40 
    ISSN: 1573-174X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Nature of Science, Research, Systems of Higher Education, Museum Science
    Notes: Abstract The decline in Nigerian universities has been perceived conservatively by university administrators as a transient “phase of negative growth” entirely attributable to external rather than internal factors. Since a condition of decline has not been apprehended, per se, it has not been possible to take appropriate management policy actions to contain it. The pattern of management of Nigerian universities has remained largely unchanged for more than three decades despite major changes in the environment. While inadequate funding is perceived as the major factor in the present decline, this study highlights those aspects of management which may also have contributed to it - thus suggesting the need for major structural changes in management. Evidence is presented to show that expenditure per student is very low in comparison with British universities and that this will be even more so if corrections are made for the social welfare burdens of Nigerian universities which do not normally form a component of university function. Although the present study is preliminary in nature, a follow-up will focus on strategic management proposals to arrest the present decline.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Journal of comparative physiology 149 (1982), S. 107-113 
    ISSN: 1432-136X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The isolated head preparation of the toadfish,Opsanus beta, perfused at constant flow rate was used to investigate the branchial vasoactive responses of the fish to adrenergic and cholinergic agonists. The perfused head maintained a relatively consistent and near in vivo branchial vascular resistance for periods of at least 8 h. Adrenergic stimulation of the isolated head produced a vasodilatory response acting via alpha and beta adrenergic receptor sites. However, the alpha adrenoceptor-mediated (vasoconstrictory) response was not observed before the dominant beta adrenoceptor-mediated (vasodilatory) response. Carbachol caused an increase in perfusion pressure which was inhibited by atrophine; thus indicating that the carbachol effect was via muscarinic receptors. The vasoconstrictory response to carbachol, unlike that of acetylcholine persisted even after withdrawal of the drug apparently due to its strong binding to receptor sites and relatively low susceptibility to attack by acetylcholinesterase. Carbachol and adrenaline influenced each other's individual vasoactive effects thus indicating a possible interaction between sympathetic and parasympathetic neurotransmitters in the regulation of branchial vasomotor tone and, consequently, branchial vascular haemodynamics.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...