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  • superconductivity  (3)
  • Recombinations  (2)
  • chromosome pairing  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Color indicator of cuprate superconductivity observed by polarized light microscopy (1989)
    Springer
    Journal of superconductivity 2 (1989), S. 351-359 
    Details
    ISSN: 1572-9605
    Keywords: Cuprates ; superconductivity ; optical microscopy ; phase differentiation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract A common mineralogical technique for identifying individual crystals in a heterogeneous, polycrystalline sample involves the observation at room temperature of their colors in reflected polarized light (colors of polarization). Here we present the observation that a brownish yellow (golden) color of polarization is not only characteristic of the YBa2Cu3O7 superconductor, but of the cuprate superconductors in general and is correlated with the occurrence of superconductivity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00618522
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  • 2
    Electronic Resource
    Electronic Resource
    Utilization of wild relatives in the genetic improvement of Arachis hypogaea L. (1986)
    Springer
    Theoretical and applied genetics 72 (1986), S. 164-169 
    Details
    ISSN: 1432-2242
    Keywords: Arachis ; Autotetraploid ; Chromosome pairing ; Genomic relationships ; Recombinations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Autotetraploids were established from 8 diploid wild species of section Arachis. In all the autotetraploids the chromosomes paired largely as bivalents even though they possess the ability to pair as multivalents. Pollen and pod fertility in the C1 generation were not directly associated with chromosome pairing. The C2 generation autotetraploids showed a gradual increase in bivalent associations and pollen and pod fertility. The identification of two genomes, A and B, in the diploid species and in the tetraploid, A. hypogaea, of the section Arachis, a fairly good crossability, and the type of chromosome associations observed in hybrids between A. hypogaea and the autotetraploids of wild Arachis species indicated good prospects of utilizing autotetraploids as genetic bridges in transferring desired traits from these taxa into groundnut.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00266988
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  • 3
    Electronic Resource
    Electronic Resource
    Utilization of wild relatives in the genetic improvement of Arachis hypogaea L. (1986)
    Springer
    Theoretical and applied genetics 72 (1986), S. 433-439 
    Details
    ISSN: 1432-2242
    Keywords: Arachis ; Amphidiploids ; Genomes ; Chromosome pairing ; Recombinations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Synthetic amphidiploids were established in 32 combinations involving 8 diploid wild species representing both A and B genomes of section Arachis. Bivalent and multivalent associations in the amphidiploids of 7 A genome species confirm that these species have identical genomes. Contrastingly, high bivalent frequencies in amphidiploids involving the A and B genome species suggest that A. batizocoi has a distinct ‘B’ genome that is partially homologous to the other genome ‘A’ represented in the rest of the species. Crossability, chromosome pairing and pollen and pod fertility in hybrids between A. hypogaea and amphidiploids have revealed that these amphidiploids can be used as a genetic bridge for the transfer of genes from the wild species into the cultivated groundnut.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00289523
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  • 4
    Electronic Resource
    Electronic Resource
    Putative genome donors ofArachis hypogaea (Fabaceae), evidence from crosses with synthetic amphidiploids (1988)
    Springer
    Plant systematics and evolution 160 (1988), S. 143-151 
    Details
    ISSN: 1615-6110
    Keywords: Angiosperms ; Fabaceae ; Arachis hypogaea ; Amphidiploids ; chromosome pairing ; genome ; putative ancestors
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Chromosome pairing, pollen and pod fertility in hybrids between cultivated tetraploidArachis hypogaea and 15 synthetic amphidiploids from 8 diploid species (7 of the A genome and 1 of the B genome) of sect.Arachis have been utilized for the identification of putative genome donors in the evolution of cultivatedA. hypogaea. These results, in conjunction with evidence from morphological similarities, phytogeographical distribution and some phytochemical features, confirm the segmental amphidiploid origin ofA. hypogaea. A. batizocoi andA. duranensis are suggested as the donors of the B genome and the A genome respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00936041
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  • 5
    Electronic Resource
    Electronic Resource
    An analysis of interspecific hybrids and phylogenetic implications inCucumis (Cucurbitaceae) (1984)
    Springer
    Plant systematics and evolution 147 (1984), S. 237-252 
    Details
    ISSN: 1615-6110
    Keywords: Angiosperms ; Cucurbitaceae ; Cucumis ; Interspecific crossability ; chromosome pairing ; pollen fertility ; phylogenetic relationship ; karyomorphology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Investigations on interspecific crossability in 8Cucumis species (2n = 24) and chromosome pairing and pollen fertility of their hybrids from 15 combinations have been utilized for tracing the phylogenetic relationships among these taxa and factors responsible for their differentiation. A collective evaluation of data suggests that there are three broad groups of species, one of the spiny fruited interfertile species, whose hybrids show varying degree of chromosome associations and low to high pollen fertility; the second of species with non-spiny fruits, which are completely incompatible with the former but weakly compatible with the cultivated species,C. melo L. to produce partly developed seeds, and the third group ofC. metuliferus E. Mey. exSchrad. andC. melo and its different botanical varieties. The species with spiny fruits can be further divided based on karyomorphological similarities and/or on relative genomic affinity, indicated by chromosome pairing and hybrid pollen fertility.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00989386
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  • 6
    Electronic Resource
    Electronic Resource
    Optical differentiation of orthorhombic superconductors such as YBa2Cu3O7 from their tetragonal precursor material (1988)
    Springer
    Journal of superconductivity 1 (1988), S. 35-44 
    Details
    ISSN: 1572-9605
    Keywords: ErBa2Cu3O7 ; superconductivity ; optical microscopy ; phase differentiation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The orthorhombic superconducting phase of YBa2Cu3O7 is shown to be differentiable from its tetragonal precursor by optical microscopy. Individual grains 1 μm in diameter or larger are found to either exhibit the color of the compensator in reflected polarized light (tetragonal material) or to change colors from the compensator (orthorhombic material). By using color differences, retained tetragonal material and the orthorhombic nature of untwinned areas of grains are identified. The advantage to producing better superconducting single crystals and sintered polycrystalline materials is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00617949
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  • 7
    Electronic Resource
    Electronic Resource
    Novel technique for crystal growth of superconducting ErBa2Cu3O7 (1988)
    Springer
    Journal of superconductivity 1 (1988), S. 181-190 
    Details
    ISSN: 1572-9605
    Keywords: ErBa2Cu3O7 ; crystal growth ; microscopy ; superconductivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Millimeter-sized crystals of ErBa2Cu3O7 were fortuitously grown while sintering a flat disk. It was possible to separate individual crystals from the sintered mass and measure their properties. The resistive transition and onset of magnetic transition of a single crystal was 93 K and the resistive transition width was 〈 1 K. Flux expulsion was observed and individual crystals could be levitated by a magnetic field. Crystals showed unusual growth features. They were heavily corrugated along the part of the crystal that grew parallel to the top surface of the disk and that coincided with thec axis of the unit cell. Crystals were characterized by X-rays, electron microscopy, and optical microscopy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00617662
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