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  • Articles  (43)
  • Springer  (43)
  • 2020-2022  (23)
  • 1985-1989  (20)
  • 1950-1954
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  • Articles  (43)
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  • 1
    Electronic Resource
    Electronic Resource
    A neolithic oral tradition for the van der Waerden/Seidenberg origin of mathematics (1985)
    Springer
    Archive for history of exact sciences 34 (1985), S. 193-220 
    Details
    ISSN: 1432-0657
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00348426
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  • 2
    Electronic Resource
    Electronic Resource
    Polychlorinated biphenyls in blue crabs from South Carolina (1987)
    Springer
    Bulletin of environmental contamination and toxicology 39 (1987), S. 857-862 
    Details
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01855866
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of tributyltin on the chemiluminescent response of phagocytes from three species of estuarine fish (1989)
    Springer
    Archives of environmental contamination and toxicology 18 (1989), S. 826-831 
    Details
    ISSN: 1432-0703
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Notes: Abstract The effect ofin vitro exposure to tributyltin (TBT) on the chemiluminescent (CL) responses of kidney macrophages was examined in oyster toadfish (Opsanus tau), hogchoker (Trinectes maculatus) and Atlantic croaker (Micropogonias undulatus). Phagocytic activity was evaluated using a luminol-amplified chemiluminescent (CL) assay with zymosan as the stimulus. Following brief exposure to selected doses of TBT, the CL response of toadfish and hogchoker phagocytes was found to be significantly decreased at 400 μg/L TBT, while the croaker phagocytic activity was significantly decreased at 40 μg/L TBT. With 18 hrexposure to TBT, the effect on the CL response was noticeable at lower doses (40 μg/L TBT for toadfish and 4 μg/L TBT for hogchoker).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01160296
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  • 4
    Electronic Resource
    Electronic Resource
    Restriction endonuclease AluI resistant chromatin of “aged” slides (1989)
    Springer
    Histochemistry and cell biology 91 (1989), S. 175-176 
    Details
    ISSN: 1432-119X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary We present a modified method for digesting the AluI resistant chromatin of old slides. The older slides require the longer treatment with much higher concentration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00492392
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  • 5
    Electronic Resource
    Electronic Resource
    Human immunoglobulin variable region genes: A new VH sequence used to detect polymorphism (1987)
    Springer
    Immunogenetics 25 (1987), S. 184-192 
    Details
    ISSN: 1432-1211
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract A human heavy chain variable region subgroup III pseudogene (HV3.3) was isolated, characterized, and sequenced. When HV3. was hybridized to Southern blots of human DNA, two potentially informative polymorphic bands, resulting from 2.7 kb Hind III (HH2.7) and 7.3 kb Eco RI(HE7.3) fragments, were detected with frequencies of 0.553 and 0.606, respectively. These polymorphic bands showed Mendelian segregation in families and appeared to be in tight linkage disequilibrium with each other (χ 1 2 =24.91, P〈0.001). Evidence from sibling-pair data indicated linkage of the Hind III polymorphic band to constant region allotypic and restriction fragment length polymorphism markers. Bands representing alternative forms of the polymorphic restriction sites were not detected for either HH2.7 or HE7.3. This indicates either that the alternative fragments comigrate with homologous fragments resulting from conserved restriction sites, or that the polymorphism is due to a gene duplication or deletion. No band segregating with HH2.7 was found in separate digests using eight other enzymes. Although this indicates that a major deletion is unlikely, it does not exclude the possibility of a gene deletion or duplication affecting the intergenic region(s) of one or more homologous genes. Whatever the precise explanation, these findings support the hypothesis that there is polymorphic variation of V H gene repertoires in man.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00344033
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  • 6
    Electronic Resource
    Electronic Resource
    Conflict, controversy, and compromise: The Concho water snake (Nerodia harteri paucimaculata) versus the Stacy Dam and Reservoir (1989)
    Springer
    Environmental management 13 (1989), S. 297-307 
    Details
    ISSN: 1432-1009
    Keywords: Concho water snake ; Endangered Species Act ; Dam ; Reservoir ; Jeopardy opinion ; Mitigation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The Colorado River Municipal Water District (CRMWD) of Big Spring, Texas, planned to construct the Stacy Reservoir and Dam on the Colorado River near Paint Rock, Texas, yet needed a Section 404 permit from the US Army Corps of Engineers pursuant to the Clean Water Act. In 1986 the Concho water snake (Nerodia harteri paucimaculata) was listed as threatened under the Endangered Species Act (ESA). Much of its remaining range included the stretch of the Colorado River that would be flooded by the proposed dam. After initially rejecting CRMWD proposals for mitigation, and informing the Corps of Engineers that it would issue a jeopardy opinion regarding the 404 permit pursuant to Section 7 of the ESA, the US Fish and Wildlife Service reversed its stand. The final biological opinion stated that reasonable and prudent alternatives previously rejected as unfeasible would remove the threat of jeopardy. This paper concludes that experimental management techniques proposed by FWS to allow dam construction do not adequately ensure survival of the Concho water snake and an alternative water source should have been found.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01874908
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  • 7
    Electronic Resource
    Electronic Resource
    Development ofBradyrhizobium infections in supernodulating and non-nodulating mutants of soybean (Glycine max [L.] Merrill) (1989)
    Springer
    Protoplasma 150 (1989), S. 40-47 
    Details
    ISSN: 1615-6102
    Keywords: Soybean ; Non-nodulating mutants ; Supernodulating mutant ; Sub-epidermal cell divisions ; Autoregulation of nodulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The early events in the development of nodules induced byBradyrhizobium japonicum were studied in serial sections of a wild type (cv. Bragg), a supernodulating mutant (nts 382) and four non-nodulating mutants (nod49, nod139, nod772, andrj 1) of soybean (Glycine max [L.] Merrill). Cultivar Bragg responded to inoculation in a similar manner to that described previously for cv. Williams; centres of sub-epidermal cell divisions were observed both with and without associated infection threads and most infection events were blocked before the formation of a nodule meristem. The non-nodulating mutants (nod49, nod772, andrj 1) had, at most, a few centres of sub-epidermal cell divisions. In general, these were devoid of infection threads and did not develop beyond the very early stages of nodule ontogeny. Sub-epidermal cell divisions or infection threads were never observed on mutant nodl39. This mutant is not allelic to the other non-nodulating mutants and represents a defect in a separate complementation group or gene that is required for nodulation. The supernodulating mutant nts382, which is defective in autoregulation of nodulation, had a similar number of sub-epidermal cell divisions as the wild-type Bragg, but a much greater proportion of these developed to an advanced stage of nodule ontogeny. Mutant nts382, like Bragg, possessed other infection events that were arrested at an early stage of development. The results are discussed in the context of the progression of events in nodule formation and autoregulation of nodulation in soybean.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01352919
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  • 8
    Electronic Resource
    Electronic Resource
    Book reviews (1987)
    Springer
    Higher education 16 (1987), S. 503-512 
    Details
    ISSN: 1573-174X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Nature of Science, Research, Systems of Higher Education, Museum Science
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00129118
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  • 9
    Electronic Resource
    Electronic Resource
    Ribonucleotide reductase: A determinant of 5-bromodeoxyuridine mutagenesis in phage T4 (1989)
    Springer
    Molecular genetics and genomics 217 (1989), S. 13-19 
    Details
    ISSN: 1617-4623
    Keywords: Ribonucleotide reductase ; 5-Bromodeoxyuridine ; Mutagenesis ; Deoxyribonucleotide pools ; Metabolic engineering
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Mutagenesis by 5-bromodeoxyuridine (BrdUrd) can result from base-pairing errors either during replication of a BrdUrd-containing template or at the nucleotide incorporation step. Replication errors give rise predominantly to AT-to-GC transitions, while incorporation errors, in which 5-bromo-dUTP competes with dCTP at a template guanine site, should give rise to GC-to-AT transitions. The latter pathway should be sensitive to deoxyribonucleoside triphosphate (dNTP) pool fluctuations. Since dNTP pools are regulated through allosteric control of ribonucleotide reductase, the control of this enzyme should be a determinant of BrdUrd mutagenesis — if mutagenesis results largely from incorporation errors. Since T4 phage-encoded ribonucleotide reductase is insensitive to feedback inhibition, we established conditions under which phage DNA replication is dependent upon ribonucleotide reductase of the host, Escherichia coli. We examined BrdUrd mutagenesis of rII mutants known to revert to wild type either by AT-to-GC or GC-to-AT transition pathways. While both reversion pathways were stimulated under all conditions analyzed, the AT-to-GC pathway was stimulated more when the E. coli reductase was functioning, while the GC-to-AT pathway was more specifically enhanced when the T4 reductase was active. These results confirm that ribonucleotide reductase is a determinant of BrdUrd mutagenesis, but our observations, plus experiments showing that BrdUrd has relatively small effects upon dNTP pool sizes, indicate that the relationship between deoxyribonucleotide metabolism and BrdUrd mutagenesis is more complex than anticipated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00330936
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  • 10
    Electronic Resource
    Electronic Resource
    Morphogenetic responses from in vitro cultured seedling explants of mung bean (Vigna radiata L. Wilczek) (1987)
    Springer
    Plant cell, tissue and organ culture 11 (1987), S. 233-240 
    Details
    ISSN: 1573-5044
    Keywords: Vigna radiata ; shoot regeneration ; callus ; organogenesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The morphogenetic responses of seedling explants of mung bean (Vigna radiata L. Wilczek cv ML-5) were studied in vitro. Direct induction of shoots/plants was possible from shoot tip, cotyledon and cotyledonary node explants. Dedifferentiation of the explants viz; Shoot tip, cotyledons, cotyledonary node, primordial leaves and roots was obtained on basal medium supplemented with auxin and cytokinin. Shoot regeneration was limited to primary calli while rhizogenesis was of common occurrence in established calli. In addition to differences in hormonal requirements, the various explants showed preferential growth in different basal media.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00040429
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