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  • Springer  (309)
  • Society of Economic Geologists (SEG)
  • 2015-2019  (287)
  • 1985-1989  (12)
  • 1980-1984  (9)
  • 1955-1959  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    The suitability of restriction fragment length polymorphisms as genetic markers in maize (1986)
    Springer
    Theoretical and applied genetics 71 (1986), S. 765-771 
    Details
    ISSN: 1432-2242
    Keywords: Zea mays L ; Restriction fragment length polymorphism (RFLP) ; Genetic mapping ; B-A translocations ; Recombinant inbreds
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Strain identification in Zea mays by restriction fragment length polymorphism should be feasible due to the high degree of polymorphism found at many loci. The polymorphism in maize is apparently higher than that currently known for any other organism. Five randomly selected maize inbred lines were examined by Southern filter hybridization with probes of cloned low copy sequences. Typically, several alleles could be distinguished among the inbred lines with any one probe and an appropriately selected restriction enzyme. Despite considerable polymorphism at the DNA level, 16 RFLP markers in three inbred lines of maize were examined for six to 11 generations and found be stable. Mapping of RFLP markers in maize can be accelerated by the use of B-A translocation stocks, which enable localization of a marker to chromosome arm in one generation. The use of recombinant inbred lines in further refinement of the map is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00276416
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  • 2
    Electronic Resource
    Electronic Resource
    DNase I hypersensitivity and expression of the Shrunken-1 gene of maize (1987)
    Springer
    Plant molecular biology 8 (1987), S. 251-264 
    Details
    ISSN: 1573-5028
    Keywords: chromatin structure ; DNase I hypersensitivity ; gene expression ; sucrose synthetase ; Zea mays
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The local chromatin structure of the Shrunken-1 (Sh) gene of maize was probed by analyzing DNase I hypersensitivity. Sh encodes the gene for sucrose synthetase, a major starch biosynthetic enzyme, which is maximally expressed in the endosperm during seed maturation. In addition to general DNase I sensitivity, specific DNase I hypersensitive sites were identified in endosperm chromatin that mapped near the 5′ end of the Sh gene. The pattern of hypersensitive sites and their relative sensitivity were altered in other non-dormant tissues that produce little or no enzyme. However, some changes in chromatin structure appear to be independent of Sh gene expression and may reflect general alterations associated with plant development. The chromatin structure of several sh mutations, induced by Ds controlling element insertions, was also analyzed. Although the insertions perturbed expression of the gene, there were no notable effects on local chromatin structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00015033
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  • 3
    Electronic Resource
    Electronic Resource
    Goodness of trees for generalized books (1987)
    Springer
    Graphs and combinatorics 3 (1987), S. 1-6 
    Details
    ISSN: 1435-5914
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mathematics
    Notes: Abstract A connected graphG is said to beF-good if the Ramsey numberr(F, G) is equal to(x(F) − 1)(p(G) − 1) + s(F), wheres(F) is the minimum number of vertices in some color class under all vertex colorings by χ (F) colors. It is of interest to know which graphsF have the property that all trees areF-good. It is shown that any large tree isK(1, 1,m 1,m 2,...,m t )-good.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01788524
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  • 4
    Electronic Resource
    Electronic Resource
    Intragenomic DNA sequence homologies in the chicken and other members of the classAves: DNA re-association under reduced stringency conditions (1980)
    Springer
    Journal of molecular evolution 15 (1980), S. 291-307 
    Details
    ISSN: 1432-1432
    Keywords: Avian genome evolution ; Intragenomic DNA sequence homology Reduced-stringency DNA reassociation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary We have investigated the intragenomic DNA sequence homologies of twelve species of birds representing five orders, and emphasizing Galliformes. This study differs in two important ways from the classical approaches taken in constructing and evaluating phylogenies based on DNA sequence similarities. Comparisons are made on the basis of sequence homologieswithin genomes of related birds, rather than between genomes. DNA is reassociated at 50°C in 0.5M phosphate buffer; these conditions allow formation and detection of duplexes containing more mismatch than would normally be permitted using more stringent conditions, affording an opportunity to observe more ancient sequence homologies. Thermal stability profiles of DNA duplexes formed under these conditions are the basis of comparison; three general patterns were observed. This approach emphasizes differences in sequence composition between genomes while the more traditional method of intergenomic tracer DNA hybridization at higher stringency emphasizes sequence similarities. No correlation was found between taxonomic position and intragenomic sequence composition, either within or between lineages. The thermal stability profiles of DNA duplexes formed within avian genomes did not reflect the biological similarities inferred from morphology, karyotype, and studies of interspecific hybridization. While all of the differences observed could have occurred over geological time, it was surprising that the genomes of the domestic chicken and the Red Jungle Fowl (Gallus gallus) differ in their sequence compositions. It appears that amplification/reduction events and/or positional changes occur rather often during evolution of a lineage.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01733136
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  • 5
    Electronic Resource
    Electronic Resource
    Solar Maximum Mission (1980)
    Springer
    Solar physics 65 (1980), S. 5-14 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The scientific objective of the Solar Maximum Mission is to understand the physics of solar flares. A description is provided for the SMM spacecraft, the scientific planning activity, the observing vprogram and the guest investigator program associated with the mission.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00151380
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  • 6
    Electronic Resource
    Electronic Resource
    Ovarian development in 46,XY gonadal dysgenesis (1982)
    Springer
    Human genetics 〈Berlin〉 60 (1982), S. 196-199 
    Details
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary In human the XY ovary is degenerative, there being scant evidence of persistence of that organ beyond the perinatal period. Here we describe indications of functional ovarian tissue in a 17-year-old female with male karyotype, H-Y+ cellular phenotype, and some signs of the Turner syndrome. Her gonads were removed after the onset of secondary amenorrhea. Histological examination revealed a degenerative right ovary devoid of germ cells and follicles, and a left streak gonad. There was no trace of testicular development in either side.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00569712
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  • 7
    Electronic Resource
    Electronic Resource
    Characteristics of site variation among clones of the 340-base pair, tandemly repeated EcoR1 family of human DNA (1986)
    Springer
    Biochemical genetics 24 (1986), S. 71-78 
    Details
    ISSN: 1573-4927
    Keywords: human DNA: alphoid sequence ; tandem repeats ; nucleosomes ; EcoR1 restriction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Twenty-four clones of EcoR1-restricted, 340-base pair (bp) DNA derived from human DNA have been sequenced and compared to a published consensus sequence for this family. No two clones were found to have identical sequences; the clones studied differed from the consensus sequence in as few as 1 or as many as 41 sites. On the average in these clones, a 5.2% divergence from exact homology was found, with 1 of 10 of the site variations being “nonrandom,” i.e., cases in which five or more clones had the same nucleotide substitution at that site (viz., 53, 124, 126, 138, 152, and 157). At site 157, for example, 16 of the 24 clones differed from the reference sequence. Positions and their respective changes, as compared to the consensus sequence, are summarized. Variations are discussed with relation to possible functions for these sequences.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00502979
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  • 8
    Electronic Resource
    Electronic Resource
    cDNAs of two non-allelic sucrose synthase genes in maize: cloning, expression, characterization and molecular mapping of the sucrose synthase-2 gene (1988)
    Springer
    Plant molecular biology 10 (1988), S. 215-224 
    Details
    ISSN: 1573-5028
    Keywords: endosperm library ; λgt11 cloning ; expression selection ; Zea mays L.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract cDNA clones of the two non-allelic sucrose synthase (Ss) genes, Ss2 and Sh, have been isolated from λgt11 expression libraries derived from immature kernel poly(A)+ RNA of sh-deletion and Sh/Sh genotypes of maize respectively. Recombinant clones containing the longest Ss2 and Sh cDNA inserts, each of approximately 2.5 kb size, were characterized and comparatively analyzed. Although the Sh cDNA insert expresses as a sucrose synthase-1 (SS1) β-galactosidase fusion protein (∼ 200 kD) in λ lysogens, the Ss2 cDNA failed to form such a chimeric protein and instead showed a ∼ 70 kD SS2 polypeptide. The Ss2 and Sh cDNAs as hybridization probes on RNA blots of immature kernels detected a larger Ss2 transcript (∼ 2900 b) than the Sh transcript (∼ 2750 b). Because SS1 and SS2 protein subunits are known to be of identical size, the significance of difference in transcript size is not apparent. A comparative restriction enzyme mapping of the two cDNA clones and a genomic Ss2 clone show sequence diversity over the entire lengths of Ss2 and Sh clones. Interestingly, restriction endonuclease sites around the 3′ ends are more conserved than the 5′ ends of these two genes. Genetic data indicate that the Ss2 locus is on chromosome 9 and molecular mapping using the Ss2 cDNA clone on recombinant inbred lines and B-A translocations stocks suggest that Ss2 is about 20 map units away from the Wx locus on 9L.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00027398
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  • 9
    Electronic Resource
    Electronic Resource
    Enzootic Aspergillosis in wild Red Vented Cockatoos in the Philippines (1981)
    Springer
    Mycopathologia 73 (1981), S. 21-23 
    Details
    ISSN: 1573-0832
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Philippine Red Vented Cockatoos were being trapped in the wild and dispersed directly to private homes, aviarys, pet stores and for export to the United States of America. Except for non-aggressive behaviour and tiring easily the subjects showed clinically nothing peculiar. Numerous cases of Aspergillosis with no clinical signs prior to death were being reported at the United States Air Force Base, Clark Field, Angeles City, Philippines. In all cases stress was a predisposing factor to death; such as enclosure in a small bird cage. Those birds in aviarys that were kept free-flying remained clinically normal, with no deaths recorded. Systematiç examination to determine the causative source of infection was carried out and revealed natural infection in the wild state as the cause of disease in caged Red Vented Cockatoos in the Philippines. Examination on three other species of Philippine Pstitticine birds revealed only the Red Vented Cockatoo to be infected or a latent carrier in the wild state.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00443008
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  • 10
    Electronic Resource
    Electronic Resource
    The formation of triarylsulfonium salts through a photochemical route (1988)
    Springer
    Polymer bulletin 19 (1988), S. 457-460 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary An original method of synthesizing triarylsulfonium salts through UV light excitation of diphenylsulfides in presence of diphenyliodonium salts is described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00263914
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