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  • Articles  (7,182)
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  • Springer  (7,182)
  • 1980-1984  (7,182)
  • Biology  (7,182)
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  • Articles  (7,182)
  • Other Sources
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  • 1
    Electronic Resource
    Electronic Resource
    Cycling of organic and inorganic sulphur in a chestnut oak forest (1982)
    Springer
    Oecologia 54 (1982), S. 141-148 
    Details
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Sulfur (S) cycling in a chestnut oak forest on Walker Branch Watershed, Tennessee, was dominated by geochemical processes involving sulfate. Even though available SO 4 2- was present far in excess of forest nutritional requirements, the ecosystem as a whole accumulated ∼60% of incoming SO4−S. Most (90%) of this accumulation occurred by SO 4 2- adsorption in sesquioxide-rich subsurface soils, with a relatively minor amount accumulating and cycling as SO 4 2- within vegetative components. Organic sulfates are thought to constitute a large proportion of total S in surface soils, also, and to provide a pool of readily mineralized available S within the ecosystem.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00378385
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  • 2
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    Cycling of organic and inorganic sulphur in a chestnut oak forest (1982)
    Springer
    Details
    Publication Date: 1982-08-01
    Print ISSN: 0029-8549
    Electronic ISSN: 1432-1939
    Topics: Biology
    Published by Springer
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    PAPER CURRENT
  • 3
    Electronic Resource
    Electronic Resource
    Ly-1 inducer and Ly-1,2 acceptor t cells in the feedback suppression circuit bear an I-J-subregion controlled determinant (1980)
    Springer
    Immunogenetics 11 (1980), S. 549-557 
    Details
    ISSN: 1432-1211
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract An I-J-subregion controlled determinant is expressed on Ly-1 inducer and Ly-1,2 acceptor T cells in the feedback suppression circuit. Ly-1 T cells absorb the I-J antibody reactive with the Ly-1,2 acceptor T cell, suggesting that both inducer and acceptor T cells have the same 1-J determinant. Since less than 10 percent of Ly-1 or Ly-1,2 T cells are killed by anti-I-J plus complement treatment, the I-J determinant demarcates functionally distinct subsets of both the Ly-1 and Ly-1,2 T-cell sets. This I-J determinant is not expressed on a detectable number of Ly-1 helper T cells which induce B lymphocytes to produce anti-sheep red cell antibody in tissue culture.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01567824
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  • 4
    Electronic Resource
    Electronic Resource
    A material isolated from human hands that attracts female mosquitoes (1982)
    Springer
    Journal of chemical ecology 8 (1982), S. 429-438 
    Details
    ISSN: 1573-1561
    Keywords: Attractants ; human ; mosquito ; collection ; concentration ; Aedes aegypti ; Anopheles quadrimaculatus ; Diptera ; Culicidae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The residue left on glass surfaces by human hands was found to be attractive to femaleAedes aegypti (L.) andAnopheles quadrimaculatus Say mosquitoes. The material lost half of its activity in 1 hr. A solvent wash technique was developed to recover and concentrate the residuum from handled glass beads. The residuum could be recovered effectively with absolute ethanol and less effectively with several other solvents. More mosquitoes were attracted to heated than to unheated residuum, an indication of its volatility. Also, attraction of the residuum decreased with decreasing concentration or dose. Concentrated residuum collections, stored under refrigeration and tested for longevity, showed no appreciable loss of attractiveness up to 60 days of storage.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00987791
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  • 5
    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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  • 6
    Electronic Resource
    Electronic Resource
    The benthic biological conditions of Los Angeles-Long Beach Harbors: Results of 28 years of investigations and monitoring (1980)
    Springer
    Helgoland marine research 34 (1980), S. 193-205 
    Details
    ISSN: 1438-3888
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Los Angeles-Long Beach Harbors were a grossly polluted body of water at the time of the initiation of benthic biological studies in 1951. Industrial, domestic and storm wastes were emptied into these waters with little or no treatment. The inner harbor waters contained little or no dissolved oxygen and much of the benthos was azoic or possessed a stressed community. However, the outer harbor water mass contained adequate dissolved oxygen, and the benthos supported a rich fauna dominated by many species of polychaetes. A pollution abatement program was initiated in 1968, and today many former wastes have been eliminated or are being diverted to treatment plants for processing. The benthic fauna changed markedly and rapidly following this environmental clean-up. Peaks in population were reached throughout the harbor in 1973–1974 which was followed by a slight decline then stability. An oil tanker explosion, pre-treatment of fish-cannery wastes then diversion of these wastes to a sewage treatment plant, and a change from primary to secondary treatment of sewage brought about changes in the benthic fauna. In the latter instance, benthic population of polychaetes, fish populations and the number of birds feeding within the area decreased significantly.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01984040
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  • 7
    Electronic Resource
    Electronic Resource
    Myofibrillar protein degradation after eccentric exercise (1984)
    Springer
    Cellular and molecular life sciences 40 (1984), S. 69-70 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Male rats were run downhill for 90 minutes (nonexhaustive). Following the exercise, muscle protein degradation was increased, as determined by urinary 3-methylhistidine. However, minimal changes were observed in the relative percentage of the minor myofibrillar proteins and in the protease calcium activated factor in the long head of the triceps brachii muscle (eccentrically exercised) following the exercise bout.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01959106
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  • 8
    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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  • 9
    Electronic Resource
    Electronic Resource
    Ökophysiologische Untersuchungen an Pflanzen der Namib-Wüste (1980)
    Springer
    Naturwissenschaften 67 (1980), S. 21-28 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Notes: Abstract The southern Namib desert has a vegetation cover of mainly succulent plants in which species of the Mesembryanthemaceae are predominant. Climatically this area is characterized by hot and dry days, and cool and humid nights with episodic rainfalls only in winter. In this environment a great number of species perform a crassulaceaen acid metabolism (CAM). The responses of these plants to water stress as well as the regulation of CAM in the natural habitat are described and discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00424499
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  • 10
    Electronic Resource
    Electronic Resource
    RNA synthesis as a measure of microbial growth in aquatic environments. I. Evaluation, verification and optimization of methods (1981)
    Springer
    Marine biology 64 (1981), S. 1-12 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Measurement of rates of microbial (bacteria and unicellular algae) ribonucleic acid (RNA) synthesis in environmental samples by radioactive tracers requires several assumptions that we test and evaluate herein. After addition of 3H-adenine to water samples from eutrophic freshwater or pelagic and oceanic ecosystems, microorganisms assimilate it without (1) any luxury uptake or (2) any expansion of intracellular adenine nucleotide pools. The calculated rate of stable RNA synthesis tends to be overestimated during the initial time periods of labeling (i.e., less than 30 s for cultures of Serratia marinorubra, and less than 20 min for most environmental samples) due to kinetic compartmentalization of the nucleic acid precursor (ATP) pool. Time-series analyses are recommended because the effects of compartmentalization decrease with increasing incubation. The kinetics of 3H-adenine uptake and aspects of its subsequent assimilation, intermediary metabolism and breakdown are described in bacteria and natural assemblages of microorganisms. Mass-balance radioactivity inventories greatly facilitate interpretation of nucleic acid precursor assimilation. Finally, we demonstrate that independent measurements of precursor (ATP) specific radioactivity are required for any elucidation of rates of stable RNA synthesis (and thus microbial growth) in nature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00394075
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