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  • 1
    Digitale Medien
    Digitale Medien
    The Selective Hydrogenation of Unsaturated Esters to Unsaturated Alcohols (1937)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 59 (1937), S. 1-3 
    Details
    ISSN: 1520-5126
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/ja01280a001
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  • 2
    Digitale Medien
    Digitale Medien
    The Selective Hydrogenation of Substituted Amides (1938)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 60 (1938), S. 402-406 
    Details
    ISSN: 1520-5126
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/ja01269a048
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  • 3
    Digitale Medien
    Digitale Medien
    Chemistry of boranes. XXX. Carbonyl derivatives of B10H102- and B12H122- (1967)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 89 (1967), S. 4842-4850 
    Details
    ISSN: 1520-5126
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/ja00995a004
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  • 4
    Digitale Medien
    Digitale Medien
    Electron transport through the salivary gland of the Lone Star tick (1978)
    Springer
    Journal of biological physics 6 (1978), S. 118-123 
    Details
    ISSN: 1573-0689
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Physik
    Notizen: Abstract After forcing current (using 3.4 volts dc at pH 7.0) across isolated salivary glands of the Lone Star tick (Amblyomna americanum L.), reduction of Nile Blue A (red coloration) appeared on the outside of the alveoli within 20 sec. In freshin vitro gland preparations a change of pH from 6.0 to 7.0 to 8.0 caused little or no change in the emf at which the red color could be seen to form. However, in “aged” preparations it was observed that a pH of 8.0 caused an increase of 0.08 volts. It was concluded that charge carriers in the tissue are quite probably both ionic and electronic in character. However, in “aged” preparations the results imply the readily detectable presence of hydrogenic (protonic) transport of charge across the tissue.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02328934
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  • 5
    Digitale Medien
    Digitale Medien
    Book reviews (1978)
    Springer
    Journal of biological physics 6 (1978), S. 177-180 
    Details
    ISSN: 1573-0689
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02328939
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  • 6
    Digitale Medien
    Digitale Medien
    Evaluation of Terrestrial and Streamside Salamander Monitoring Techniques at Shenandoah National Park (2000)
    Springer
    Environmental monitoring and assessment 63 (2000), S. 65-79 
    Details
    ISSN: 1573-2959
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik
    Notizen: Abstract In response to concerns about amphibian declines, a study evaluating and validating amphibian monitoring techniques was initiated in Shenandoah and Big Bend National Parks in the spring of 1998. We evaluate precision, bias, and efficiency of several sampling methods for terrestrial and streamside salamanders in Shenandoah National Park and assess salamander abundance in relation to environmental variables, notably soil and water pH. Terrestrial salamanders, primarily redback salamanders (Plethodon cinereus), were sampled by searching under cover objects during the day in square plots (10 to 35 m2). We compared population indices (mean daily and total counts) with adjusted population estimates from capture-recapture. Analyses suggested that the proportion of salamanders detected (p) during sampling varied among plots, necessitating the use of adjusted population estimates. However, adjusted population estimates were less precise than population indices, and may not be efficient in relating salamander populations to environmental variables. In future sampling, strategic use of capture-recapture to verify consistency of p's among sites may be a reasonable compromise between the possibility of bias in estimation of population size and deficiencies due to inefficiency associated with the estimation of p. The streamside two-lined salamander (Eurycea bislineata) was surveyed using four methods: leaf litter refugia bags, 1 m2 quadrats, 50 × 1 m visual encounter transects, and electric shocking. Comparison of survey methods at nine streams revealed congruent patterns of abundance among sites, suggesting that relative bias among the methods is similar, and that choice of survey method should be based on precision and logistical efficiency. Redback and two-lined salamander abundance were not significantly related to soil or water pH, respectively.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1006413603057
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  • 7
    Digitale Medien
    Digitale Medien
    Geographic Analysis of Species Richness and Community Attributes of Forest Birds from Survey Data in the Mid-Atlantic Integrated Assessment Region (2000)
    Springer
    Environmental monitoring and assessment 63 (2000), S. 81-94 
    Details
    ISSN: 1573-2959
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik
    Notizen: Abstract Species richness of local communities is a state variable commonly used in community ecology and conservation biology. Investigation of spatial and temporal variations in richness and identification of factors associated with these variations form a basis for specifying management plans, evaluating these plans, and for testing hypotheses of theoretical interest. However, estimation of species richness is not trivial: species can be missed by investigators during sampling sessions. Sampling artifacts can lead to erroneous conclusions on spatial and temporal variation in species richness. Here we use data from the North American Breeding Bird Survey to estimate parameters describing the state of bird communities in the Mid-Atlantic Assessment (MAIA) region: species richness, extinction probability, turnover and relative species richness. We use a recently developed approach to estimation of species richness and related parameters that does not require the assumption that all the species are detected during sampling efforts. The information presented here is intended to visualize the state of bird communities in the MAIA region. We provide information on 1975 and 1990. We also quantified the changes between these years. We summarized and mapped the community attributes at a scale of management interest (watershed units).
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1006473804874
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  • 8
    Digitale Medien
    Digitale Medien
    A citywide breeding bird survey for Washington, D.C. (1997)
    Springer
    Urban ecosystems 1 (1997), S. 87-102 
    Details
    ISSN: 1573-1642
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Architektur, Bauingenieurwesen, Vermessung , Energietechnik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1018563125184
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  • 9
    Digitale Medien
    Digitale Medien
    Effect of reinforcement type on the mechanical properties of polypropylene composites (1976)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 16 (1976), S. 252-256 
    Details
    ISSN: 0032-3888
    Schlagwort(e): Chemistry ; Chemical Engineering
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: The possible reinforcing effects of six different types of filler particles on composites based on the thermoplastic polypropylene have been examined. It is found that significant increases in elastic modulus and tensile strength can be obtained by addition of ≥ 10 percent by volume of glass fibers. Ceramic whiskers, based on alumina and silicon carbide, also lead to increases in modulus but to decreases in strength and ductility. Additional measurements were made with composites prepared from two sizes of spherical glass beads and from carbon spheres. For the glass beads, an increase in modulus was obtained but strength and elongation to fracture decreased. Carbon spheres were ineffective as a reinforcing agent. The possible effects of nonuniform mixing, of size and shape of filler particles, and of surface coatings are discussed.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pen.760160406
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  • 10
    Digitale Medien
    Digitale Medien
    Subcellular location of phosphoproteins in salivary glands of the lone star tick, Amblyomma americanum (L.) (1987)
    New York, NY [u.a.] : Wiley-Blackwell
    Archives of Insect Biochemistry and Physiology 5 (1987), S. 29-43 
    Details
    ISSN: 0739-4462
    Schlagwort(e): cyclic AMP ; protein phosphorylation ; subcellular fractionation ; tick salivary glands ; Chemistry ; Food Science, Agricultural, Medicinal and Pharmaceutical Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie
    Notizen: Phosphoproteins were examined by electrophoresis and autoradiography in fractions of tick salivary glands. When whole salivary glands were preincubated in 32Pi, then stimulated by 10 μM dopamine and subsequently fractionated, substantial phosphate was incorporated into 45,000-, 47,000-, and 62,000-dalton proteins of the plasma membrane-rich 11,500g pellet and 100,000g supernatant. When tissue homogenates were incubated in [γ-32P] ATP prior to subcellular fractionation, the 62,000-, 47,000-, and 45,000-dalton proteins were enhanced by cyclic AMP in all fractions and were most prominent in the membrane-rich 11,500g fraction. Phosphoproteins of the same molecular masses were also found in the 11,500g pellet and 100,000g supernatant when labelled with [γ-32P] ATP in the presence of cAMP.
    Zusätzliches Material: 8 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/arch.940050104
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