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  • 1
    Electronic Resource
    Electronic Resource
    Spatial structure in length at age of cod in the Barents Sea (2003)
    Oxford, UK : Blackwell Science Ltd
    Journal of fish biology 62 (2003), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Cod Gadus morhua population in the Barents Sea was found to be spatially structured with regard to length-at-age. Results were based on data collected during research surveys in the Barents Sea between 1982 and 1997. The identified spatial structure was most pronounced for age groups 2–4 years and decreased for the older age groups with higher potential for migration. A positive linear correlation between mean length-at-age and mean geographical temperature was established for age groups 2–4 years. This correlation was shown to be strongest when based on mean temperatures during 3 year periods ending with the year of capture. The spatial structure in length-at-age was shown to follow the temperature gradient of the Barents Sea. A large part of the observed area effects could be explained by temperature variation between areas. Evidence is also presented which indicates that the predictability and sensitivity of the dependence of length-at-age on temperature increases under extreme environmental conditions, i.e. in the northern and eastern areas of the Barents Sea.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1095-8649.2003.00047.x
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  • 2
    Electronic Resource
    Electronic Resource
    Studies on group-specific determinants of adenovirus hexons (1973)
    Springer
    Archives of virology 42 (1973), S. 254-263 
    Details
    ISSN: 1432-8798
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Hexon preparations of type 1, 2, 3, 5, 7, and 14 adenoviruses were treated with a water-soluble carbodiimide to cause the blocking of at least one antigen component. Comparative studies of native and CDI-modified hexons, showed the groupspecific component of all hexons to consist of at least two different components; one being CDI-resistant and the other one CDI-sensitive. In addition, a CD-Iresistant subgroup-specific component was found in type 3, 7, and 14 hexons. Animal immune sera did not always contain antibodies against both of the two group-specific components. CDI-treatment of hexons resulted in an increase in their isoelectric points from 4.9–5.4 to 6.4–7.1, as well as an observed reactivity with agar and some slightly acid proteins. The carbodiimide did not cause the formation of hexon complexes to occur. A new effective method designed to obtain highly purified hexon preparations by means of immunoadsorption is described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01265650
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Ecology and adaptation of stunted growth in fish (1999)
    Springer
    Evolutionary ecology 13 (1999), S. 433-453 
    Details
    ISSN: 1573-8477
    Keywords: age-structured population ; Eurasian perch ; optimal maturity ; resource limitation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Dwarf individuals are observed in many species of freshwater fish. This paper studies the potential causes of such stunted growth. We present a model which describes the effect of growth conditions on the age- and size-structure of fish populations. The model parameters are chosen to characterize a Eurasian perch population. Two possible causes of stunting are identified: resource limitation and size- or age-dependent survival probabilities. While the former mechanism often arises from intraspecific density dependence, the latter is of particular relevance in the context of interspecific interactions and fishing. After evaluating the immediate ecological consequences of these factors, we examine the potential for life-history adaptations in stunted fish populations. Interactions between the ecological and adaptive mechanisms of stunting are shown to be intricate: not only does the age at maturity of individuals affect their growth trajectories, but, in addition, alterations in growth conditions can result in different adaptively stable ages at maturity. We show that such adaptive responses can either alleviate or amplify stunting caused by ecological factors. Life-history adaptation may also lead to the persistence of stunting when ecological factors alone would allow for normal growth. An appreciation of the interplay between ecological and adaptive factors therefore is critical for understanding the causes and mechanisms of stunted growth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006755702230
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  • 4
    Electronic Resource
    Electronic Resource
    Beiträge zur Chemie der Alkylverbindungen von Übergangsmetallen. X. Uber Versuche zur Alkylierung von Molybdän(V)- und Molybdän(IV)-chlorid - Zur Kenntnis des Methylmolybdäntrichlorids (1972)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 394 (1972), S. 293-300 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: It is reported on reactions of molybdenum pentachloride and molybdenum tetrachloride with zinc dialkyls and tin tetraalkyls. Methyl molybdenum trichloride was obtained in form of a complex with diethyl ether of the formula CH3MoCl3 · O(C2H5)2.
    Notes: Es wird über Reaktionen von Molybdän(V)- und Molybdän(IV)-chlorid mit Zinkdialkylen und mit Zinntetraalkylen berichtet. Als neuartige ♂-Alkylmolybdänverbindung konnte dabei das Methylmolybdäntrichlorid-diäthylätherat CH3MoCl3 · O(C2H5)2 erhalten werden.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19723940312
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