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  • Articles  (1,421)
  • Other Sources
  • Springer  (1,421)
  • 2005-2009
  • 1980-1984  (1,421)
  • 1982  (1,421)
  • Biology  (1,421)
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  • Articles  (1,421)
  • Other Sources
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  • 2005-2009
  • 1980-1984  (1,421)
Year
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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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  • 3
    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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  • 4
    Electronic Resource
    Electronic Resource
    The chromosomal component of reproductive isolation in the grasshopper Caledia captiva (1982)
    Springer
    Chromosoma 86 (1982), S. 509-531 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract A comparison of chiasma distribution patterns between two chromosomal taxa, Moreton and Torresian, and their F1 hybrids demonstrates highly significant differences between all chromosomes analysed. In chromosomes 1, 2, 4, 5, 6 and 8 these differences can be directly attributed to pericentric heterozygosity in the F1 hybrid. In chromosomes 7 and 8 where there is no pericentric heterozygosity these differences may be due to heterozygosity for interstitial and terminal bands of hetero-chromatin or possibly undetected paracentric rearrangements. The F1 hybrids also have a significantly lower mean cell chiasma frequency. The Moreton and Torresian taxa differ significantly in chiasma distribution pattern in chromosomes 1, 2, 4, 5, 6 and 8 and both Moreton populations analysed have a significantly lower mean cell chiasma frequency than the Torresian population. In addition the two Moreton populations, (MMX) and (MAX), differ significantly in the chiasma distribution pattern in chromosomes 1 and 2 and the chromosomally more polymorphic population (MMX) has a significantly lower mean cell chiasma frequency. There is some evidence that the differences in both chiasma distribution and frequency between these two populations may be due to genetic differences in addition to the effects caused by chromosomal polymorphism. It has been shown that in general there is a substantial reduction in recombination in the intersitial regions of most chromosomes in the Moreton and particularly the Torresian taxon because of a proximal-distal localisation of chiasmata. In the F1 hybrid, however, nearly all recombination events are located within these interstitial regions. This provides support for the hypothesis that the frequent placement of chiasmata in regions of normally low recombination may disrupt the internal coadapted genetic environment of both chromosomal forms resulting in non-functional recombinant progeny in the next generation. The recombination data in this study also provide a basis for an empirical test of this hypothesis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00330124
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  • 5
    Electronic Resource
    Electronic Resource
    The chromosomal component of reproductive isolation in the grasshopper Caledia captiva (1982)
    Springer
    Chromosoma 86 (1982), S. 533-549 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract An analysis of the relative viabilities of recombinant and nonrecombinant chromosomes among the surviving embryos from back-crosses involving the Moreton (M) and Torresian (T) taxa has revealed that these embryos do not contain a representative sample of gametes derived from the F1 hybrid parent. The significant deviations in the hybrid gametic population arise entirely from intrachromosomal effects with no evidence of any between-chromosome interactions. This is interpreted as clear evidence to show that recombinational repatterning within heterozygous bivalents in the F1 parent is a significant factor in inducing the observed deviant segregation ratios. Furthermore, by using a population which is chromosomally equivalent to the Torresian but genically similar to the Moreton, it has been shown that over 46% of the F2 embryonic breakdown arises solely from the effects of chromosomal heterozygosity upon recombination repatterning among (Moreton × Torresian) F1 hybrids. From these data it is proposed that each chromosome is internally coadapted in the sense that it contains balanced blocks of cis-acting acting loci which can be disrupted by recombinational change. Disruption of the linear association of the genes on structurally different chromosomes by recombination repatterning results in novel intrachromosomal associations which may be functionally inadequate and so lead to arrested embryonic development. It is speculated that an important factor in arresting development may involve interactions between the novel recombinant chromosomes of the gamete and maternal factors laid down in the egg during oogenesis which are responsible for the sequential activation of the genomes of the progeny during development. Thus coadaptation is interpreted in terms of the functional intergration of a chromosome with the products of the genome of the previous generation. The assessment of the relative viabilities of recombinant and nonrecombinant chromosomes has shown that the Torresian nonrecombinant chromosomes possess the highest viabilities in the sequence TN〉MN≧TR = MR where N and R represent nonrecombinant and recombinant classes. This sequence is relevant to the structure of the hybrid zone between the Torresian and Moreton taxa and explains both its asymmetry and the basis of the observed introgression of Torresian chromosomes into the Moreton taxon and the absence of the reverse movement.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00330125
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  • 6
    Electronic Resource
    Electronic Resource
    A reappraisal of antigenic determinants for nitrogenase from Azotobacter and nitrate reductase from Escherichia coli (1982)
    Springer
    Archives of microbiology 132 (1982), S. 304-307 
    Details
    ISSN: 1432-072X
    Keywords: Azotobacter ; E. coli ; Nitrate reductase ; Nitrogenase ; Antigenic Determinants
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Previous work based on double immunodiffusion assays had shown that there are common antigenic determinants for nitrate reductase from Escherichia coli and component I of nitrogenase from Azotobacter vinelandii. Further work reported herein using a variety of immunoelectrophoretic techniques indicates that the cross-reaction between nitrate reductase and antiserum to component I of nitrogenase results from a contaminant antigen co-purified with nitrate reductase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00413379
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  • 7
    Electronic Resource
    Electronic Resource
    Butyricin 7423 and the membrane H+-ATPase of Clostridium pasteurianum (1982)
    Springer
    Archives of microbiology 131 (1982), S. 81-86 
    Details
    ISSN: 1432-072X
    Keywords: Bacteriocin ; Butyricin 7423 ; Clostridium pasteurianum ; Membrane H+-ATPase ; Adenosine triphosphatase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The bacteriocin butyricin 7423 inhibited the activity of the membrane H+-ATPase (BF0, F1) of vegetative cells of Clostridium pasteurianum but not that of its soluble BF1 component. In vitro studies with the H+-ATPases of mutant strains selected for diminished sensitivity (a) to butyricin 7423 and (b) to dicyclohexylcarbodi-imide, confirmed that butyricin 7423 interacts with the BF0 component of this enzyme complex. Even so, certain other mutant strains displaying decreased sensitivity to butyricin 7423 possessed H+-ATPases which in vitro showed undiminished sensitivity to inhibition by the bacteriocin. Furthermore, from the changes in intracellular ATP concentration and in the rates and net extent of efflux of intracellular 86Rb+ ions that were provoked by exposure of the parent and several of the mutant strains to butyricin 7423, it was concluded that its primary bactericidal action was not attributable to stoichiometric inhibition of the membrane H+-ATPase. High extracellular concentrations of K+ ions enabled Cl. pasteurianum to survive exposure to low concentrations of this membrane-active bacteriocin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00451503
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  • 8
    Electronic Resource
    Electronic Resource
    Simple ‘wet calibrator’ for use with transcutaneous gas sensors (1982)
    Springer
    Medical & biological engineering & computing 20 (1982), S. 781-782 
    Details
    ISSN: 1741-0444
    Keywords: Gas sensors ; Transcutaneous monitors
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02442538
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  • 9
    Electronic Resource
    Electronic Resource
    Chemotherapy ofTrypanosoma brucei in mice with diminazene aceturate (1982)
    Springer
    Parasitology research 67 (1982), S. 337-340 
    Details
    ISSN: 1432-1955
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00927669
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  • 10
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    Butyricin 7423 and the membrane H+-ATPase of Clostridium pasteurianum (1982)
    Springer
    Details
    Publication Date: 1982-02-01
    Print ISSN: 0302-8933
    Electronic ISSN: 1432-072X
    Topics: Biology
    Published by Springer
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