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  • 1
    Electronic Resource
    Electronic Resource
    Glycogen in the Dividing Cells of the Liver of the Chicken Embryo (1953)
    [s.l.] : Nature Publishing Group
    Nature 172 (1953), S. 678-679 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Glycogen can be demonstrated histologically in the liver of the chicken embryo at the end of the seventh day of incubation3. In the present investigations the liver was removed from the embryo during the eighth and ninth days and immediately fixed in Carnoy's fluid. Sections were stained for ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/172678b0
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  • 2
    Electronic Resource
    Electronic Resource
    Growth and Aerobic Glycolysis in the Retina of the Chicken Embryo (1952)
    [s.l.] : Nature Publishing Group
    Nature 169 (1952), S. 246-246 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Until the eighth day of incubation, the rate of growth of the eye (and, it is assumed, of the retina) decreases similarly to the rate of aerobic glycolysis, suggesting the relationship found in the midbrain. This relationship does not hold after the eighth day, as there is a rise in the rate of ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/169246a0
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of D -Tubocurarine Chloride and Carbaminoylcholine on the Respiration of Daphnia (1950)
    [s.l.] : Nature Publishing Group
    Nature 166 (1950), S. 441-441 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Carbaminoylcholine increases respiration and movement in a concentration of 0-01 mgm./lOO ml. The increase of respiration reaches a maximum of 190 per cent normal between the concentrations of 1 and 10 mgm./lOO ml., when movement is considerably increased. Higher concentrations produce, smaller ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/166441a0
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  • 4
    Electronic Resource
    Electronic Resource
    Community Organization in Marine Algal Epifaunas (1981)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Ecology, Evolution, and Systematics 12 (1981), S. 49-74 
    Details
    ISSN: 0066-4162
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.es.12.110181.000405
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  • 5
    Electronic Resource
    Electronic Resource
    Growth and Axon Formation in the Midbrain of the Chicken Embryo (1953)
    [s.l.] : Nature Publishing Group
    Nature 171 (1953), S. 131-131 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] It is thus of interest to inquire whether equivalent phases occur in the development of nerve cells the axons of which remain within the central nervous system and which cannot regenerate. In the chicken embryo, such cells are found in the dorsal region of the midbrain vesicle which contributes to ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/171131a0
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  • 6
    Electronic Resource
    Electronic Resource
    Effect of Acridine Compounds on the Respiration of the Brain of the Six-Day Chick Embryo (1949)
    [s.l.] : Nature Publishing Group
    Nature 163 (1949), S. 405-405 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] IN relating the effect of certain acridines on mitosis to that on respiration, the inhibition of the oxygen consumption of the isolated brain of the six-day chick embryo by these compounds has been measured. It is thought that a note on these results would be of interest as a comparison with ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/163405b0
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  • 7
    Electronic Resource
    Electronic Resource
    Residential expansion as a continental threat to U.S. coastal ecosystems (2000)
    Springer
    Population and environment 21 (2000), S. 429-468 
    Details
    ISSN: 1573-7810
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Sociology
    Notes: Abstract Spatially extensive analysis of satellite, climate, and census data reveals human-environment interactions of regional or continental concern in the United States. A grid-based principal components analysis of Bureau of Census variables revealed two independent demographic phenomena, α-settlement reflecting traditional human settlement patterns and β-settlement describing relative population growth correlated with recent construction in non-agricultural areas, notably in coastal, desert, and “recreational” counties and around expanding metropolitan areas. Regression tree analysis showed that β-settlement was differentially associated with five distinct combinations of seasonality, summer heat or cool, intensity of agriculture, and extent of “barren” land. Beta-settlement was greatest in coastal and desert areas, and coincided with national concentrations of threatened and endangered species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02436749
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  • 8
    Electronic Resource
    Electronic Resource
    Niche breadth in Bryozoa as a test of competition theory (1975)
    [s.l.] : Nature Publishing Group
    Nature 256 (1975), S. 307-309 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Intraspecific competition should result in an increase in the range of a resource spectrum used by a species, as at high population levels the advantages to any individual of being at the competition-free optimum of a resource gradient are offset by the intense intraspecific competition found there ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/256307a0
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  • 9
    Electronic Resource
    Electronic Resource
    Prey depletion and foraging strategy in the Oystercatcher Haematopus ostralegus (1977)
    Springer
    Oecologia 27 (1977), S. 75-92 
    Details
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The responses of a population of Oystercatchers to their own depletion of their prey, the edible cockle Cerastoderma edule, have been examined in Strangford Lough, Northern Ireland., Cockle stocks were severely depleted each winter as a result of predation by Oystercatchers and about half the birds present in October in the main study area had left by March: the reduction was greater when the initial population of Oystercatchers was high than when it was low. Oystercatchers were initially widespread around the Lough but tended to aggregate by January into a few good sites. Within each site annual differences in the location of feeding effort were correlated with year to year variation in the location of second winter cockles. Within the feeding areas in a bay the birds apparently hunted in the short-term on the basis of expectation, ceasing to crop, the densest cockle beds once an average yield for the area has been removed; this yield was apparently estimated from the local density of the anvils on which captured cockles were broken open. This effect led to marginal areas being depleted of cockles more rapidly than high density areas, so that the birds gradually concentrated their hunting onto an increasingly restricted area of the bay. The birds initially took only second winter and larger cockles but by late winter cockle densities had fallen so much that smaller cockles were accepted: areas previously abandoned or unused for hunting were then economically viable because of the reduced expectations of the birds and were incorporated into the feeding areas. These results are seen as consistent with Royama's profitability theory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00345686
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  • 10
    Electronic Resource
    Electronic Resource
    Production of a new thermostable neutral α-galactosidase from a strain of Bacillus stearothermophilus (1974)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 16 (1974), S. 1227-1243 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: An intracellular, thermostable, neutral α-galactosidase (α-D-galactoside galactohydrolase EC 3.2.1.32) was produced in pilot plant quantities from a strain of Bacillus stearothermophilus. The organism was cultured at 50°C in a soluble neutral medium containing water extract of soybean meal (3%) and 0.5% yeast extract. The enzyme biosynthesis was inducible and sensitive to catabolite repression. After autolysis of the cells, the α-galactosidase was selectively and quantitatively complexed from clarified beer directly onto DEAE Sephadex; and enzyme-rich fractions were batchwise eluted with an increasing gradient of NaCl solutions. The eluates were given two consecutive isopropyl alcohol precipitations, and the aqueous solutions of the second precipitate were dialyzed and lyophilized. Final product activity recovery was 72% based on the crude fermentation beer. Best specific activity was 5.2 u/mg protein. Further laboratory purification (DEAE Sephadex and Bio-Gel P200) yielded a product with 14.2 u/mg protein.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260160907
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