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  • Artikel  (29)
  • evolution  (29)
  • Springer  (29)
  • Blackwell Publishers Ltd
  • Blackwell Publishing Ltd
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  • International Union of Crystallography
  • 2020-2022
  • 1995-1999
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  • Artikel  (29)
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  • Springer  (29)
  • Blackwell Publishers Ltd
  • Blackwell Publishing Ltd
  • Emerald
  • International Union of Crystallography
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  • 2020-2022
  • 1995-1999
  • 1985-1989  (22)
  • 1975-1979  (7)
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  • 1
    Digitale Medien
    Digitale Medien
    Cardiac design in lower vertebrates: what can phylogeny reveal about ontogeny? (1988)
    Springer
    Cellular and molecular life sciences 44 (1988), S. 919-930 
    Details
    ISSN: 1420-9071
    Schlagwort(e): Heart ; circulation ; blood ; lower vertebrate ; embryology ; evolution
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary In very few instances can the cardiovascular systems of adult ‘lower’ vertebrates serve asdirect models for development in ‘higher’ vertebrates, primarily because numerous evolutionary specializations for preferential distribution of cardiac output between systemic tissues and gas exchange, organs occur in the highly derived circulation of most extant lower vertebrates. Yet, the extensive literature on the cardiovascular anatomy and physiology of aquatic and air breathing fishes, amphibians and reptiles offers important conceptual insights into both patterns and mechanisms of development in birds and mammals. The primary contribution of such studies to the student of developing bird and mammal circulations is the clear demonstration that surprisingly complex hemodynamic function can develop from supposedly ‘simple’ cardiovascular systems typified by incompletely divided heart chambers. Thus, the hemodynamics of embryonic bird and mammal circulations should be determined by measurement, rather than inferred from structure.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01939885
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Misuses of biology in the context of the paranormal (1988)
    Springer
    Cellular and molecular life sciences 44 (1988), S. 297-303 
    Details
    ISSN: 1420-9071
    Schlagwort(e): Biology ; creation science ; creationism ; evolution ; hundredth monkey phenomenon ; paranormal ; pseudoscience
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary Public suspicion of science stems from science's challenging of perceptions and myths about reality, and a public fear of new technology. The result is a susceptibility to pseudoscience. In claiming that creation ‘science’ is as valid as evolution the creationists misquote scientists and seek to spread their own ‘scientific’ myths concerning a young age for the earth, an act of creation based on a particular literalist interpretation of the Christian Bible and a single worldwide flood. They use methods of debate and politics, rather than scientific research. A selection of their arguments is examined and the nature of the evidence for evolution is discussed. Problems with the creation ‘science’ model are noted. In the myth of the hundredth monkey phenomenon, original research is misquoted to denigrate scientific research and support sentimental ideas of paranormal events. The misuse of science is seen as damaging to society because it reduces the effective gathering and application of scientific information. However, pseudoscience provides a valuable guide to gaps in public scientific education.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01961266
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Host specificity in phytophagous insects: selection pressure from generalist predators (1988)
    Springer
    Entomologia experimentalis et applicata 49 (1988), S. 131-140 
    Details
    ISSN: 1570-7458
    Schlagwort(e): evolution ; monophagy ; polyphagy ; host range ; Vespidae ; caterpillars ; predation ; Mischocyttarus flavitarsus
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract The narrow host range of insect herbivores is noted, and some of the reasons why specificity has evolved are reviewed. Works indicating the need for new approaches are pointed out including the possibility that generalist predators provide a suitable pressure. Experiments to test the hypothesis that generalists are more vulnerable than specialists to predators are described. They involved a vespid wasp and over thirty species pairs of caterpillars, matched for size and density. Overall, generalists were taken more readily than specialists: some but not all reasons could be detected. The results are discussed in ecological and evolutionary terms.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00188246
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    A comparison of the activity of flight interneurones in locusts, crickets, dragonflies and mayflies (1988)
    Springer
    Cellular and molecular life sciences 44 (1988), S. 735-738 
    Details
    ISSN: 1420-9071
    Schlagwort(e): Insect ; flight ; evolution
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary The activity patterns of interneurones in the flight systems of dragonflies and mayflies were investigated using standard intracellular recording and staining techniques, and were compared with those of crickets and locusts. The results show several basic similarities in the operation of a central motor pattern generator for flight in all four groups of insects. These similarities can be explained as resulting from conservative evolution of flight pattern generating circuitry within the central nervous system.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01959144
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
    Digitale Medien
    Digitale Medien
    Problems and prospects in morphogenesis (1988)
    Springer
    Cellular and molecular life sciences 44 (1988), S. 633-637 
    Details
    ISSN: 1420-9071
    Schlagwort(e): Morphogenesis ; evolution ; development
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01941023
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
    Digitale Medien
    Digitale Medien
    A cryptic intermediate in the evolution of chameleon tongue projection (1988)
    Springer
    Cellular and molecular life sciences 44 (1988), S. 697-700 
    Details
    ISSN: 1420-9071
    Schlagwort(e): Lizard ; Chamaeleontidae ; Agamidae ; tongue ; feeding ; evolution
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary An incipient form of tongue projection occurs inPhrynocephalus helioscopus, a generalized agamid lizard. We argue that this condition represents a functional intermediate between typical lingual prehension and chamaeleontid tongue projection, and that tongue projection evolved in chameleons by augmentation of ancestral mechanisms still operating in related, generalized lizards.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01941032
    Standort Signatur Erwartet Verfügbarkeit
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  • 7
    Digitale Medien
    Digitale Medien
    Free radicals in aging (1988)
    Springer
    Molecular and cellular biochemistry 84 (1988), S. 155-161 
    Details
    ISSN: 1573-4919
    Schlagwort(e): aging ; free radicals ; antioxidants ; disease ; evolution ; longevity
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie , Medizin
    Notizen: Summary Aging is the progressive accumulation of changes with time that are responsible for the ever-increasing likelihood of disease and death. These irreversible changes are attributed to the aging process. This process is now the major cause of death in the developed countries. This fact is obscured by the protean nature of the contributions of this process to the events which terminate life. The aging process may be due to free radical reations. This theory is supported by: 1) studies on the origin and evolution of life; 2) the numerous studies of the effect of ionizing radiation on living systems; 3) life span experiments in which the diet was modified so as to alter endogenous free radical reaction levels; 4) the plausible explanations it provides for aging phenomena; and 5) the growing number of studies which implicate free radical reactions in the pathogenesis of specific diseases. The relationship between aging and diseases involving free radical reactions seems to be a direct one. Modulation of the normal distribution of deleterious free radical reaction-induced changes throughout the body by genetic and environmental differences between individuals results in patterns of change, in some sufficiently different from the normal aging pattern to be recognized as disease. The growing number of ‘free radical’ diseases includes the two major causes of death, cancer and atherosclerosis. It is reasonable to expect on the basis of present data that a judicious selection of diets and antioxidant supplements will increase the healthy, active life span by 5–10 or more years.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00421050
    Standort Signatur Erwartet Verfügbarkeit
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  • 8
    Digitale Medien
    Digitale Medien
    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
    Schlagwort(e): evolution ; polyploidy ; ribosomal RNA genes ; cyprinid fish
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00484870
    Standort Signatur Erwartet Verfügbarkeit
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  • 9
    Digitale Medien
    Digitale Medien
    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
    Schlagwort(e): evolution ; polyploidy ; RNA content ; protein content ; enzyme activities ; Cyprinidae ; Isospondyli
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00485129
    Standort Signatur Erwartet Verfügbarkeit
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  • 10
    Digitale Medien
    Digitale Medien
    Developmental specificity and evolution of the acid phosphatase isozymes of Triticum aestivum and its progenitor species (1976)
    Springer
    Biochemical genetics 14 (1976), S. 595-609 
    Details
    ISSN: 1573-4927
    Schlagwort(e): Triticum ; acid phosphatase ; isozymes ; developmental genetics ; evolution
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie
    Notizen: Abstract The tissue and developmental specificities of the acid phosphatase (ACPH) isozymes of Triticum aestivum and its progenitor species T. turgidum and T. tauschii have been determined and compared using the zymogram technique. Tissue and/or developmental variation in relative staining intensity, suggestive of variation in the quantity of active enzyme present, was observed for each of the seven major isozymes expressed. Isozymes homologous to each of the major isozymes of the hexaploid were detected in one or the other of the progenitor species. No difference in the pattern of developmental or tissue specificity was observed between the species for any isozyme. However, ACPH-4, encoded by Acph4, a structural gene linked to chromosome 4A, differs in electrophoretic mobility between T. aestivum and T. turgidum, indicating that divergence has occurred between these species at the Acph4 locus since the origin of the hexaploid. The molecular weight of each of five ACPH isozymes of the hexaploid was determined to be approximately 58,000. This finding, plus the results of the developmental study and the earlier demonstration that the structural genes for six isozymes (including four of those whose molecular weight was determined) are linked to homoeologous chromosomes, provides evidence in support of the suggestion that the ACPH structural genes of hexaploid wheat are homoeologously related.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00485838
    Standort Signatur Erwartet Verfügbarkeit
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