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  • 1980-1984  (94)
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  • 1
    Electronic Resource
    Electronic Resource
    The Role of Nervous Systems in Temperature Adaptation of Poikilotherms (1981)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Physiology 43 (1981), S. 281-300 
    Details
    ISSN: 0066-4278
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Medicine , Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.ph.43.030181.001433
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  • 2
    Electronic Resource
    Electronic Resource
    HPLC Analysis of Sorbic Acid in Citrus Fruit (1981)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 46 (1981), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A method for the determination of sorbic acid (2,4-hexadienoic acid) in citrus fruit is described. The method consists of extraction of the peel with methanol, clean-up of the extract by solvent partitioning and column chromatography, and quantitative determination by reverse-phase HPLC using UV detection. The method is applicable to orange, lemon, and grapefruit and the detection limit is 0.5 ppm. Analysis of fruit fortified with 1–10 ppm sorbic acid indicated an average recovery of 95.6% with a coefficient of variance of 2.9%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1981.tb04240.x
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  • 3
    Electronic Resource
    Electronic Resource
    Constancy of oceanic deposition of 10 Be as recorded in manganese crusts (1982)
    [s.l.] : Nature Publishing Group
    Nature 299 (1982), S. 240-242 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The extent of variation in the oceanic deposition rate of 10Be during the past 2.5 Myr has been assessed based on the 10Be distribution in sediment cores4'5. An upper limit of ±10% has been placed on the variation when the deposition is integrated over time periods of 2-7 x 105 yr. For ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/299240a0
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  • 4
    Electronic Resource
    Electronic Resource
    IgG antibodies to phosphorylcholine exhibit more diversity than their IgM counterparts (1981)
    [s.l.] : Nature Publishing Group
    Nature 291 (1981), S. 29-34 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] An amino acid sequence analysis of the N-terminal immunoglobulin heavy and light chain variable regions (VH and VL) from 16 hybridoma proteins which bind phosphorylcholine as well as the complete sequence analysis of 9 of these VH regions is presented. There seem to ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/291029a0
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  • 5
    Electronic Resource
    Electronic Resource
    10 Be profiles in seawater (1982)
    [s.l.] : Nature Publishing Group
    Nature 299 (1982), S. 712-714 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Our analytical results are summarized in Table 1. The Drake Passage profile was obtained by combining waters taken from four stations (stations 32-35) occupied by RV Hudson during 1970. The latitudes of these stations ranged from 5749' to 6334' S, and the longitudes from 6648' to 6810' W. ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/299712a0
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  • 6
    Electronic Resource
    Electronic Resource
    High-resolution electron microscopy of octacalcium phosphate and its hydrolysis products (1984)
    Springer
    Calcified tissue international 36 (1984), S. 219-232 
    Details
    ISSN: 1432-0827
    Keywords: Octacalcium phosphate ; Hydroxyapatite ; Hydrolysis ; Lattice imaging ; Crystallographic disorder
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Summary The hydrolysis and dehydration products of synthetic octacalcium phosphate (OCP) were studied using X-ray diffraction, infrared spectroscopy, chemical analysis, and high-resolution electron microscopy (HREM). A “collapsed OCP” phase, identified by a characteristic 16.5 Å reflection in its X-ray diffraction pattern, was observed when OCP was dehydrated. High resolution electron microscopy of the hydrolyzed and partially hydrolyzed reaction products also revealed local contrast features with an approximate 16.5 Å periodicity. These features were consistent with a collapse of the OCP crystal structure and subsequent formation of epitaxial intergrowths of OCP and hydroxyapatite. Chemical analysis and X-ray diffraction of these samples were similar to previously reported calcium-deficient apatites. The hydrolysis of OCP to form calcium-deficient apatities is a reaction pathway which may be of importance in understanding the crystallographic changes occurring during the early stages of bone, calculus, and dental enamel formation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02405321
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  • 7
    Electronic Resource
    Electronic Resource
    Nd and Sr isotopes in kimberlites and lamproites from Western Australia: an enriched mantle origin (1983)
    [s.l.] : Nature Publishing Group
    Nature 302 (1983), S. 400-403 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Previous Nd isotopic studies1'2 of kimberlites have shown that they generally have initial 143Nd/144Nd ratios corresponding to £Nd 0, implying derivation from a relatively undifferenti ated mantle source with chondritic Sm/Nd. This interpretation is difficult to reconcile with the fact that many ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/302400a0
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  • 8
    Electronic Resource
    Electronic Resource
    Nd-Sr isotopic and geochemical systematics in Cambrian boninites and tholeiites from Victoria, Australia (1984)
    Springer
    Contributions to mineralogy and petrology 88 (1984), S. 164-172 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Rocks with boninitic affinities have been recognised in a number of “ophiolites”, including the Cambrian Heathcote and Mt Wellington Greenstone Belts of Victoria. Boninites and high-Mg andesites from the Heathcote Greenstone Belt show a restricted range of initial ɛ Nd values of between +3.3 to +5.8. Extremely refractory boninites from the Mt Wellington Greenstone Belt have ɛ Nd ranging from +1.3 to −9. Ti/Zr is positively correlated with Sm/Nd with the Heathcote lavas generally possessing greater depletion of Ti and enrichment of Zr relative to the middle and heavy REE with increasing LREE/HREE. These data are consistent with the generation of boninites by partial melting of refractory peridotite following invasion by LREE- and Zr-enriched, low ɛ Nd fluids. Tholeiites overlying the boninites in both greenstone belts have flat REE patterns and ɛ Nd∼+5, lower than that anticipated for lavas derived from depleted MORB source reservoirs in the Cambrian, suggesting that their source was also contaminated by a LREE-enriched, low ɛ Nd component similar to that involved in the generation of the Howqua boninites. The added components have characteristics compatible with their derivation from subducted altered oceanic crust and/or from wet subducted sediments. The identification of boninites and other low-Ti lavas in the Victorian greenstone belts is strong evidence for island arc development in southeastern Australia during the Lower Cambrian and provides further support for a subduction-related origin for many ophiolites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00371420
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  • 9
    Electronic Resource
    Electronic Resource
    The linkage mapping of cloned restriction fragment length differences in Caenorabditis elegans (1982)
    Springer
    Molecular genetics and genomics 188 (1982), S. 286-291 
    Details
    ISSN: 1617-4623
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The genomic DNA of two closely related strains of the nematode, Caenorhabditis elegans, Bristol (N2), and Bergerac (Bo), has different restriction endonuclease sites (Emmons et al. 1979). Since these two strains interbreed, it is possible to regard the restriction fragment length differences (RFLDs) as mutant variants. The N2 and Bo pattern can be segregated and mapped using clasical genetic techniques. Utilizing a number of genetic markers existing in the N2 strain, we have constructed hybrid populations homozygous for either Bristol or Bergerac over a given chromosomal region with random Bristol-Bergerac composition for the remainder of the genome. Genomic restriction digests from these hybrid populations were probed with random cloned fragments of Bristol DNA. In this way, fragments were mapped to genetically well characterized regions of the C. elegans genome. 27 probes which hybridize to a total of 310 Kb of DNA were found to exhibit six restriction fragment differences. Four of these differences have been mapped, providing probes for four different genomic regions. We have combined classical genetics and recombinant DNA technology to construct linkage maps of cloned DNA fragments using restriction fragment length differences. We are pursuing this approach in order to advance the knowledge of the genetic organization of C. elegans and to provide a means of cloning genes in an organism which provides an experimental model for the study of many biological systems. It is hoped that this approach will also provide a practical solution to some difficult problems in nematode strain identification. Furthermore, the characterization of the families of transposable elements responsible for generating many of the RFLDs will undoubtedly contribute to the understanding of the biological significance of these elements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00332689
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  • 10
    Electronic Resource
    Electronic Resource
    Characterization of lipid storage associated proteins induced in crop tissue by prolactin (1984)
    Springer
    Journal of comparative physiology 154 (1984), S. 237-242 
    Details
    ISSN: 1432-136X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The protein components involved in prolactin-induced lipid sequestration in crop tissue of pigeons (Columba livia) have been investigated from regulatory and structural viewpoints. The key enzyme necessary for lipogenesis, fatty acid synthetase (FAS), was not detected by a radiochemical assay which readily detects FAS in liver tissue. Therefore, lipid storage in crop involves sequestration rather than de novo synthesis in the crop per se. Two polypeptides (crop milk polypeptides, CMP) having apparent molecular weights of 58,000 (CMP 58) and 50,500 (CMP 50.5) have been isolated from prolactin-induced crop lipid globules (Fig. 1). Structural studies determining disulfide linkage (Fig. 2), protease sensitivity (Fig. 3) and antigenic reactivity (Fig. 4) indicate that CMP 50.5 is located extrinsic to the lipid globules, whereas CMP 58 is by and large intrinsic to the matrix of the lipid globules. Prolactin indudes synthesis of CMP 58 and 50.5 to a level which is three times higher than can be accounted for by general protein synthesis induction and represents about 2.5% of protein synthesis in the induced crop.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02464402
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