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  • nitrogen
  • evolution
  • Springer  (25)
  • 1975-1979  (25)
  • 1
    Electronic Resource
    Electronic Resource
    Salting coefficients for gases in seawater from scaled-particle theory (1975)
    Springer
    Journal of solution chemistry 4 (1975), S. 523-534 
    Details
    ISSN: 1572-8927
    Keywords: Salting coefficient ; scaled-particle theory ; gas solubilities ; seawater ; helium ; neon ; argon ; oxygen ; nitrogen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Experimental values of the salting coefficients for He, Ne, Ar, O2, and N2 in seawater are compared with values calculated from scaled-particle theory. The agreement is reasonably good; the average difference between calculated and observed values at 25°C is 0.007. Scaled-particle theory predicts correctly thatk s should decrease as the temperature increases and that this effect should be most pronounced at low temperatures. However, the predicted magnitude ofdK s/dt is only about half of that observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00650690
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  • 2
    Electronic Resource
    Electronic Resource
    Comparative immunochemical studies of primate hemoglobins (1975)
    Springer
    Biochemical genetics 13 (1975), S. 743-757 
    Details
    ISSN: 1573-4927
    Keywords: primate hemoglobins ; antigenicity ; evolution ; radioimmunoassay
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The antigenic properties of a number of chromatographically purified primate hemoglobins were compared to those of normal human hemoglobin using a sensitive radioimmunochemical procedure. The degree of inhibition of the antigen-antibody reaction with heterologous hemoglobins appeared to be related to the structural similarity of these proteins to the normal human hemoglobin immunogen. With the exception of the baboon hemoglobin, the antigenicity of the hemoglobins paralleled the phylogeny of the primates. The gorilla and chimpanzee hemoglobins were antigenically identical to normal human hemoglobin, whereas the gibbon and orangutan hemoglobins were substantially more variable. Of the Old World monkey hemoglobins examined, the baboon produced lower inhibition values, suggesting a greater degree of structural dissimilarity than other Cercopithecoidea hemoglobins, which is compatible with a greater rate of evolutionary change occurring in this protein. Using the known amino acid sequences of human and other primate hemoglobins, we have attempted to identify antigenic determinant areas of the proteins.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00484406
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  • 3
    Electronic Resource
    Electronic Resource
    Gene action in fish of tetraploid origin. II. Cellular and biochemical parameters in clupeoid and salmonoid fish (1975)
    Springer
    Biochemical genetics 13 (1975), S. 301-309 
    Details
    ISSN: 1573-4927
    Keywords: cell size ; evolution ; gene action ; isoenzymes ; polyplodiy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract By use of cell size, protein and hemoglobin content, and enzyme activities as markers, it becomes apparent that in the course of evolution the gene expression of anciently tetraploid fish of the order Ostariophysi was diploidized, but no such regulatory mechanism has evolved in the phylogenetically tetraploid species of the order Isospondyli. This finding is discussed in terms of possible selective neutrality of tetraploid expression and the phylogenetic age of Isospondyli.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00485815
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  • 4
    Electronic Resource
    Electronic Resource
    Gene action in fish of tetraploid origin. III. Ribosomal DNA amount in cyprinid fish (1976)
    Springer
    Biochemical genetics 14 (1976), S. 19-26 
    Details
    ISSN: 1573-4927
    Keywords: evolution ; polyploidy ; ribosomal RNA genes ; cyprinid fish
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Phylogenetically diploid and tetraploid cyprinid fish species have cells of very similar volumes and protein contents. This finding has prompted us to postulate a regulatory system established during the evolution of the tetraploids leading to a diploid state of genic expression. It was proposed that this might be accounted for by a selective loss of ribosomal genes. RNA-DNA hybridization experiments, however, reveal a clear-cut 1:2 relationship of ribosomal DNA amounts between the diploid and the tetraploid species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00484870
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  • 5
    Electronic Resource
    Electronic Resource
    Gene action in fish of tetraploid origin. V. Cellular RNA and protein content and enzyme activities in cyprinid, clupeoid, and salmonoid species (1976)
    Springer
    Biochemical genetics 14 (1976), S. 975-980 
    Details
    ISSN: 1573-4927
    Keywords: evolution ; polyploidy ; RNA content ; protein content ; enzyme activities ; Cyprinidae ; Isospondyli
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The ratio of cellular RNA and protein content is about 1:1 between phylogenetically diploid and tetraploid species of the teleost family Cyprinidae, but is roughly in proportion to ploidy in species of the teleost order Isospondyli. Enzyme activities do not unequivocally comply with this scheme. These findings are discussed in view of the hypothesis that a regulatory mechanism which reduces genic activity has evolved in the tetraploid cyprinids but not in the tetraploid species of the order Isospondyli.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00485129
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  • 6
    Electronic Resource
    Electronic Resource
    The influence of chironomus plumosus larvae on the exchange of dissolved substances between sediment and water (1979)
    Springer
    Hydrobiologia 66 (1979), S. 149-159 
    Details
    ISSN: 1573-5117
    Keywords: Chironomus ; sediment ; exchange ; nitrogen ; phosphorus ; silica ; iron ; manganese
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract 4th instar Chironomus plumosus larvae (about 1000·m−2) were added to tubes containing sediment and overlying water. At a temperature of 20°C the larvae greatly increased the trasnport of silica, phosphorus and iron from the sediment to the water. Oxygen concentrations did not influence the exchange of silica. For two non-calcareous sediments the exchange of phosphorus and iron was much higher under anaerobic than under aerobic conditions while the difference was small for sediment from a hardwater lake. Exchange of inorganic nitrogen was little influenced by added chironomid larvae.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00032045
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  • 7
    Electronic Resource
    Electronic Resource
    Nutrient limitation of phytoplankton in a central Arizona reservoir (1976)
    Springer
    Hydrobiologia 51 (1976), S. 219-224 
    Details
    ISSN: 1573-5117
    Keywords: nutrients ; nutrient limitation ; phytoplankton ; phosphorus ; nitrogen ; carbon
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The influence of added nutrients nitrogen, phosphorus and carbon on the phytoplankton of a small recreational reservoir in central Arizona was investigated during the summer, 1974. Polyethylene bags were used to isolate lake water and the natural populations for the addition of nitrogen, phosphorus and carbon individually and in combination. A large increase in phytoplankton numbers, extractable chlorophyll, pH and dissolved oxygen occurred only in bags to which both nitrogen and phosphorus were added, suggesting that both nitrogen and phosphorus levels were limiting to the primary producers. Little alteration in species composition resulted from the addition of the above nutrients.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00005747
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  • 8
    Electronic Resource
    Electronic Resource
    Skeleton weight allometry in aquatic and terrestrial vertebrates (1977)
    Springer
    Hydrobiologia 56 (1977), S. 35-37 
    Details
    ISSN: 1573-5117
    Keywords: allometry ; skeleton weight ; vertebrates ; whales ; fishes ; bones ; evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The relation of skeleton weight to body weight with increasing size is compared for aquatic and terrestrial vertebrates. Due to the buoyancy of water, the skeleton weights of aquatic vertebrates (fishes and whales) vary in nearly direct proportion (exponent 1.0) to body weight; while the skeletons of terrestrial vertebrates occupy an increasingly greater proportion of total body weight as size increases (exponent greater than i. i) due to the necessity of supporting their weight on land.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00023283
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  • 9
    Electronic Resource
    Electronic Resource
    Zoogeography and the predator-prey ‘arms race:’ A comparison of eriphia and nerita species from three faunal regions (1977)
    Springer
    Hydrobiologia 56 (1977), S. 63-67 
    Details
    ISSN: 1573-5117
    Keywords: zoogeography ; predation ; evolution ; coevolution ; allometry ; Eriphia ; Nerita ; Gulf of California ; competition ; ecology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We measured maximum shell diameters and thicknesses of Nerita funiculata Menke and N. scabricosta Lamarck (Gastropoda: Neritidae), and claw sizes and carapace widths of the predatory crab Eriphia squamata Stimpson (Brachyura: Xanthidae), from the Gulf of California (Eastern Pacific). We also tested the ability of E. squamata to crush Nerita shells of various sizes. We compared this data on predator-prey counteradaptations with previously published data for congeneric species from the Western Atlantic and Indo-West Pacific regions. In relative abilities of the crabs to crush gastropod shells, and of the gastropod shells to resist such crushing, the Eastern Pacific species were ‘stronger’ than their counterparts in the Western Atlantic, but ‘weaker’ than their Indo-West Pacific congeners, indicative of an intermediate level of ‘faunal dominance’ or predator-prey ‘arms race’ escalation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00023286
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  • 10
    Electronic Resource
    Electronic Resource
    Chemical composition studies on some aquatic macrophytes in three Scottish lochs. I. Chlorophyll, ash, carbon, nitrogen and phosphorus. (1979)
    Springer
    Hydrobiologia 63 (1979), S. 161-166 
    Details
    ISSN: 1573-5117
    Keywords: Chemical composition studies ; chlorophyll content ; carbon ; nitrogen ; phosphorus ; freshwater macrophytes ; Scottish lochs
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The chlorophyll, ash, carbon, nitrogen and phosphorus levels in seven species of freshwater macrophytes (Juncus effusus L., Iris pseudacorus L., Carex rostrata Stokes, Glyceria maxima (Hartm.) Holmberg, Nuphar lutea (L) Sm., Polygonum amphibium L. and Schoenoplectus lacustris (L) Pallas) in three Scottish lochs of different trophic levels were studied during 1975. Mean chlorophyll levels varied from a minimum of 1.73 mg g−1 dry weight in Balgavies Loch Juncus to 10.22 mg g−1 dry weight for Forfar Loch Iris. Carbon contents ranged from 450 to 520 mg g−1 ash-free dry weight. For ash, nitrogen and phosphorus, significant differences in mean concentrations were detected among plant species as well as within one plant species growing in different lochs. Positive correlations were apparent between the degree of eutrophication in the study areas and the amount of ash, phosphorus and nitrogen present in the plants growing in them.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00030079
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