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  • Articles  (10,941)
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  • 2005-2009
  • 1980-1984  (10,941)
  • 1983  (5,550)
  • 1981  (5,391)
  • Biology  (9,222)
  • Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition  (1,764)
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  • Articles  (10,941)
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  • 2005-2009
  • 1980-1984  (10,941)
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  • 1
    Electronic Resource
    Electronic Resource
    Comparative mechanical performances of some new devices for fixation of unstable pelvic ring fractures (1983)
    Springer
    Medical & biological engineering & computing 21 (1983), S. 657-663 
    Details
    ISSN: 1741-0444
    Keywords: Biomechanical stability ; External fixation ; Pelvic fractures
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract A laboratory cadaveric model, developed previously for the study of currently employed external fixation devices used for unstable pelvic fractures was used to evaluate rigidity improvements associated with a number of fixation design innovations. Based on quasistatic shearing displacements measured at the sacro-iliac joint and symphysis pubis disruption sites, otherwise identical anterior frameworks constructed on 5 mm fixation halfpins, rather than upon standard 4 mm halfpins, were able to sustain markedly (58% to 210%) greater loadings. A new and very simple traingular framework was designed and constructed for which the fixation rigidity was found to rival that of much more complex and cumbersome double anterior frames. When used as the posterior component of combined anterior/posterior fixation systems, a new double cobra-type (internal) plate allowed the injury model pelvises to sustain near-physiological load levels. A pair of dynamic compression plates attached across a disrupted symphysis pubis was found to be a biomechanically acceptable substitute for an anterior external fixator.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02464027
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  • 2
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    Cloned viral protein vaccine for foot-and-mouth disease: responses in cattle and swine (1981)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1981-12-04
    Description: A DNA sequence coding for the immunogenic capsid protein VP3 of foot-and-mouth disease virus A12, prepared from the virion RNA, was ligated to a plasmid designed to express a chimeric protein from the Escherichia coli tryptophan promoter-operator system. When Escherichia coli transformed with this plasmid was grown in tryptophan-depleted media, approximately 17 percent of the total cellular protein was found to be an insoluble and stable chimeric protein. The purified chimeric protein competed equally on a molar basis with VP3 for specific antibodies to foot-and-mouth disease virus. When inoculated into six cattle and two swine, this protein elicited high levels of neutralizing antibody and protection against challenge with foot-and-mouth disease virus.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kleid, D G -- Yansura, D -- Small, B -- Dowbenko, D -- Moore, D M -- Grubman, M J -- McKercher, P D -- Morgan, D O -- Robertson, B H -- Bachrach, H L -- New York, N.Y. -- Science. 1981 Dec 4;214(4525):1125-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6272395" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Antibody Formation ; Base Sequence ; Cattle ; Cattle Diseases/*prevention & control ; *Cloning, Molecular ; DNA Restriction Enzymes ; DNA, Recombinant/metabolism ; Foot-and-Mouth Disease/*prevention & control ; Immunity, Cellular ; Protein Biosynthesis ; Swine ; Swine Diseases/*prevention & control ; Transcription, Genetic ; *Vaccines ; Viral Proteins/genetics/*therapeutic use
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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    PAPER CURRENT
  • 3
    Electronic Resource
    Electronic Resource
    Directed Mutagenesis (1981)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Genetics 15 (1981), S. 265-294 
    Details
    ISSN: 0066-4197
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.ge.15.120181.001405
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  • 4
    Electronic Resource
    Electronic Resource
    The relationship between stomatal conductance, transpiration rate and tracheid structure in Pinus radiata clones grown at different water vapour saturation deficits (1983)
    Oxford, UK : Blackwell Publishing Ltd
    Plant, cell & environment 6 (1983), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract. Stomatal conductance and needle water potential of P. radiata clones were measured after 2, 5 and 8 months on plants grown in controlled environment rooms with markedly different water vapour saturation deficits (D). Conductance was significantly lower at high D, but water potential differences between treatments were not significant. When trees were moved between treatments most of the changes in conductances occurred within 2 h, with residual changes after 24 h. Water potentials were not different 24 h after the trees were moved. The effects were completely reversible.Transpiration rates of individual trees were highest in the high D treatment and lowest in the low D treatment. They were not linearly related to D because of decreasing conductance with increasing D.Height growth, diameter growth and foliage areas were not significantly different between treatments. Tracheid lumen diameters tended to be larger in trees grown at higher D although treatment differences were not significant.There were significant clonal differences in shoot conductance and tracheid dimensions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/1365-3040.ep11589331
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  • 5
    Electronic Resource
    Electronic Resource
    The Effects of a Land Drainage Scheme on the Salmonid Populations of the River Camowen, Co. Tyrone (1983)
    Oxford, UK : Blackwell Publishing Ltd
    Aquaculture research 14 (1983), S. 0 
    Details
    ISSN: 1365-2109
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Annual electro fishing surveys were carried out over an 11-year period at five sites on an upland river, which was subject to dredging operations in connection with a land drainage scheme. Four of the sites were dredged 3 years after the start of the survey and one control site remained undredged throughout. The results indicated that dredging operations initially reduced Salmonid densities and that there was subsequently a progressive downstream recovery, with fry densities taking up to 6 years to improve at the most downstream site. Yearling and older fish recovered to pre-drainage scheme levels more rapidly than fry.Changes in population structure were also observed at three of the dredged sites. Two sites were considerably deepened and finally contained larger numbers of older fish than prior to the drainage scheme. The opposite effect was found to have taken place at a site, which became shallower as a result of drainage works, and contained larger numbers of fry at the end of the survey.Increased fish growth rates were also observed at all sites over the experimental period, and this may have been correlated with enrichment of the river system by leaching from increased fertilizer usage within the catchments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2109.1983.tb00049.x
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  • 6
    Electronic Resource
    Electronic Resource
    Sensory Properties and Lipid Oxidation in Prerigor Processed Fresh Pork Sausage (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: Fresh pork sausage prepared from prerigor ground and salted meat had higher pH, lower cooking losses, higher juiciness scores, and less easily fragmented cooked patties than that prepared from post-rigor ground and salted meat. Sausage from prerigor ground-post-rigor salted meat was intermediate in these properties to prerigor ground and salted and postrigor ground and salted products. Prerigor grinding and salting reduced the rate of autoxidation (TBA number) during storage at 0°C contrasted to oxidation in sausage that was salted postrigor after either prerigor or postrigor grinding.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1981.tb04456.x
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  • 7
    Electronic Resource
    Electronic Resource
    Microstructure of Liver Sausage (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: Cooked liver sausage was freeze-fractured and examined using scanning electron microscopy after fixation in either Zenker's solution or osmium tetroxide. The microstructure was characterized as consisting of dispersed protein particles and fibrous networks of protein surrounding variable-sized fat globules. If the fat globules were not thoroughly fixed they were dislodged from the freeze-fractured surfaces leaving vacuoles that could easily be mistaken for air pockets. The study demonstrated that the structure of liver sausage includes both an oil in water emulsion with protein as the emulsifier as well as dense layers of protein or protein-fat colloidal complexes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1981.tb15327.x
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  • 8
    Electronic Resource
    Electronic Resource
    Molecular cloning and organization of two leghaemoglobin genomic sequences of soybean (1981)
    [s.l.] : Nature Publishing Group
    Nature 289 (1981), S. 516-518 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Double-stranded cDNA prepared to nodule RNA was digested with Sau3A restriction endonuclease and ligated into the BamHl site of the plasmid pBR322 (see Fig. 1 legend). Clones containing Lb sequences were identified by their ability to hybridize with soybean root nodule cDNA, by their hybridization ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/289516a0
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  • 9
    Electronic Resource
    Electronic Resource
    Soybean leaf urease: Comparison with seed urease (1983)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 57 (1983), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Soybeans, Glycine max (L.) Merr., from ureides for transport of nitrogen from the root nodule to the shoot. The most direct routes for ureide utilization include the degradation of ureide-derived urea to NH3 and CO2. Ureolytic activity was found in leaf disks of soybean and exhbited optimal activity at pH 7 in the presence of a high concentration of urea (250 mM). In vitro studies showed neither urea amidolyase nor urea dehydrogenase activity in soybean leaves and the ureolytic activity was characterized as urease. Several biochemical properties of soybean leaf urease were determined and compared to seed urease properties. Soybean leaf urease differed from that of seed in five ways: pH optima (5.25 and 8.75), apparent Km (0.8 mM), no inhibition by hydroxyurea, faster electrophoretic mobility and no cross-reactivity with soybean seed urease antibodies. The data suggest that urease is the primary urea metabolizing enzyme present in soybean leaves. The properties of soybean leaf urease support the conclusion that a unique isozyme of urease is present in leaf tissue.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1983.tb02297.x
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  • 10
    Electronic Resource
    Electronic Resource
    Induction and development of mouse liver glutathione S-transferase activity (1981)
    Springer
    Cellular and molecular life sciences 37 (1981), S. 445-446 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Mouse liver glutathione S-transferase activity at birth was 1/10 that of adults, and increased steadily with each successive week of age until adult values were reached at 8 weeks. Activity was inducible with phenobarbital; however, the percentage increase in activity was dependent upon substrate. 2 distinct peaks of transferase activity were obtained on CM-cellulose chromatography. The ratios of transferase activity observed for each peak demonstrated that glutathione S-transferase activity in mouse liver is associated with at least 2 distinct proteins with differing substrate specificities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01986122
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