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  • 1
    Electronic Resource
    Electronic Resource
    Age changes of spine density in posterior-anterior and lateral projections in normal women (1995)
    Springer
    Calcified tissue international 56 (1995), S. 201-205 
    Details
    ISSN: 1432-0827
    Keywords: Bone densitometry ; Bone ; Osteoporosis ; Aging osteopenia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Abstract Bone mineral density (BMD) was measured in 353 healthy white women using dual-energy X-ray absorptiometry (DXA). Measurements were made of both the posterior-anterior (PA) and lateral spine, as well as the proximal femur (neck and Ward's triangle). From age 50 to 80 years, the BMD of the PA spine and femur neck BMD had an 18% diminution (0.6%/year), and BMD of the lateral spine showed about a 35–40% decline (1.4%/year). The Ward's triangle region of the femur was not quite as decreased (30% or 1.1%/year). The BMD decrease associated with aging did not differ as much among sites when expressed relative to the intrapopulation variation rather than as a percentage. The Z-score for PA spine and femur neck BMD (-1.1) was significantly different than that for lateral spine BMD (-1.6); Ward's triangle was intermediate (-1.3), i.e., the lateral spine still showed the highest sensitivity to aging. However, the ability to detect age changes in an individual subject can be increased only if the precision error for lateral spine BMD is not increased to a greater extent than the sensitivity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00298610
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  • 2
    Electronic Resource
    Electronic Resource
    Towards the molecular basis for the regulation of mitochondrial dehydrogenases by calcium ions (1995)
    Springer
    Molecular and cellular biochemistry 149-150 (1995), S. 203-212 
    Details
    ISSN: 1573-4919
    Keywords: calcium ; mitochondria ; FAD-glycerol 3-phosphate dehydrogenase ; pyruvate dehydrogenase ; oxoglutarate dehydrogenase ; isocitrate dehydrogenase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract In mammalian cells, increases in calcium concentration cause increases in oxidative phosphorylation. This effect is mediated by the activation of four mitochondrial dehydrogenases by calcium ions; FAD-glycerol 3-phosphate dehydrogenase, pyruvate dehydrogenase, NAD-isocitrate dehydrogenase and oxoglutarate dehydrogenase. FAD-glycerol 3-phosphate dehydrogenase, being located on the outer surface of the inner mitochondrial membrane, is exposed to fluctuations in cytoplasmic calcium concentration. The other three enzymes are located within the mitochondrial matrix. While the kinetic properties of all of these enzymes are well characterised, the molecular basis for their regulation by calcium is not. This review uses information derived from calcium binding studies, analysis of conserved calcium binding motifs and comparison of amino acid sequences from calcium sensitive and non-sensitive enzymes to discuss how the recent cloning of several subunits from the four dehydrogenases enhances our understanding of the ways in which these enzymes bind calcium. FAD-glycerol 3-phosphate dehydrogenase binds calcium ions through a domain which is part of the polypeptide chain of the enzyme. In contrast, it is possible that the calcium sensitivity of the other dehydrogenases may involve separate calcium binding subunits.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01076578
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  • 3
    Electronic Resource
    Electronic Resource
    Observations on the effects of incubation at inhibitory temperature on subsequent hatching of anostracan cysts (1995)
    Springer
    Hydrobiologia 298 (1995), S. 179-181 
    Details
    ISSN: 1573-5117
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Hatching progressively for cysts ofBranchinecta lindahli Packard when they were incubated for 6 and 12 hours at a temperature known to inhibit hatching (30 °C) prior to transfer to a favorable hatching temperature of 15 °C. Cyst ofThamnocephalus platyurus Packard, by contrast, hatched normally at 28 °C after transfer from 48, 72, and 96 hour incubation periods at the inhibitory low temperature of 10 °C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00033813
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  • 4
    Electronic Resource
    Electronic Resource
    A contribution to the systematics of the Streptocephalidae (Branchiopoda: Anostraca) (1995)
    Springer
    Hydrobiologia 298 (1995), S. 203-232 
    Details
    ISSN: 1573-5117
    Keywords: Streptocephalus ; morphology ; classification ; phylogeny ; fairy shrimp ; phyllopod
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract While developing a data base for phylogenetic analysis of the New World streptocephalids we compaired them with species from Africa, Europe, and India. In doing this, we found that the morphology of the peduncle of the distal antennal outgrowth and the biramous ovaries developed in seven North American species can contribute to the systematics of the genus. Thus, our investigation consisted of (1) a review of the external morphology of the antenna, (2) biometry of selected parts of the antenna to obtain informative ratios, (3) a review of the presence or absence of genetal linguiform outgrowths, extension of the non-retractile parts of the penes, and general morphology of the cercopods, (4) a study of the location of the ovaries, and extension of the brood-pouch. On the basis of the results we classifyStreptocephalus into nine species groups. Five subgroups are identified within two of the species groups Several implications of the present approach are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00033815
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  • 5
    Electronic Resource
    Electronic Resource
    Uncovering the Laurasian roots ofEubranchipus (1995)
    Springer
    Hydrobiologia 298 (1995), S. 241-243 
    Details
    ISSN: 1573-5117
    Keywords: anostracan genera ; generic characters
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The species of the anostracan genusEubranchipus Verrill, 1870 can be recognized as belonging to the same taxon and unambiguously distinguished from all other taxa in the family Chirocephalidae Daday, 1910 by the common morphology of their eversible penes. These reproductive structures are short, fat, and cylindrical with a single long, thin spine on the lateral margin at the tip of each penis. This ends the erroneous perception ofEubranchipus as a New World genus and recognizes it as an old taxon with members distributed accross the modern continents that once comprised Laurasia.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00033818
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  • 6
    Electronic Resource
    Electronic Resource
    Anostraca of the Indian Subcontinent (1995)
    Springer
    Hydrobiologia 298 (1995), S. 287-293 
    Details
    ISSN: 1573-5117
    Keywords: India ; Pakistan ; Sri Lanka ; species richness ; taxonomy ; zoogeography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract There are 15 species of Anostraca belonging to 6 genera on the Indian Subcontinent. These are:Artemia sp. (reportedly a bisexual form of undetermined species);Artemia parthenogenetica Bowen & Sterling, 1978;Branchinecta orientalis Sars, 1901;Branchinella hardingi (Qadri & Baqai, 1956);Branchinella kugenumaensis (Ishikawa, 1895);Branchinella ornata Daday, 1910;Branchipodopsis acanthopenes (Malhotra & Duda, 1970);Branchipodopsis affinis Sars, 1901;Branchipus schaefferi Fischer, 1834;Chirocephalus priscus (Daday, 1910);Streptocephalus dichotomus Baird, 1860;Streptocephalus echinus Bond, 1934;Streptocephalus longimanus Bond, 1934;Streptocephalus simplex Gurney, 1906;Streptocephalus spinifer Gurney, 1906. Comparing numbers of species for southern India with other reasonably well studied areas, demonstrated that anostracan species richness is higher in the climatically more varied temperate regions than it is in the more uniform tropics. Tropical South India has six species compared to 13 in Arizona (USA), 19 in California (USA), 10 in Morocco, and 14 in Italy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00033823
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  • 7
    Electronic Resource
    Electronic Resource
    Diagnosis and phylogeny of the new world streptocephalidae (Branchiopoda: Anostraca) (1995)
    Springer
    Hydrobiologia 298 (1995), S. 15-44 
    Details
    ISSN: 1573-5117
    Keywords: Streptocephalus ; morphology ; systematics ; North America ; new species ; cladistics ; fairy shrimp
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We present an updated diagnosis of 13Streptocephalus species of North America. Three new species are included. A key to the species is provided. The phylogeny of the group is discussed on the basis of (1) a systematic approach (Maeda-Martinezet al., 1995; this volume), which considers the entire distal antennal outgrowth, the frontal appendage, and the morphology of the ovaries as essential in defining different genetic lineages or species-groups, and (2) a cladistic analysis. We suggest that of nine monophyletic groups, three are represented in both the Old and New World. Thus, contrary to former disparsalist hypotheses, we argue that the New World species represent relict forms of ancestral groups fragmented by continental drift (vicariance model).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00033798
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  • 8
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    Diagnosis and phylogeny of the new world streptocephalidae (Branchiopoda: Anostraca) (1995)
    Springer
    Details
    Publication Date: 1995-02-01
    Print ISSN: 0018-8158
    Electronic ISSN: 1573-5117
    Topics: Biology
    Published by Springer
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  • 9
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    A contribution to the systematics of the Streptocephalidae (Branchiopoda: Anostraca) (1995)
    Springer
    Details
    Publication Date: 1995-02-01
    Print ISSN: 0018-8158
    Electronic ISSN: 1573-5117
    Topics: Biology
    Published by Springer
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  • 10
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    Uncovering the Laurasian roots ofEubranchipus (1995)
    Springer
    Details
    Publication Date: 1995-02-01
    Print ISSN: 0018-8158
    Electronic ISSN: 1573-5117
    Topics: Biology
    Published by Springer
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