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  • 1
    Electronic Resource
    Electronic Resource
    Polymorphisms for asymmetric reciprocal translocations in two species of the genus Sideritis L. (Lamiaceae) (1983)
    Springer
    Chromosoma 88 (1983), S. 83-89 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Meiotic and karyotypic analyses of six populations of two closely related species belonging to the section Eusideritis of the genus Sideritis (five of S. saetabensis and one of S. tragoriganum) (Lamiaceae), revealed polymorphisms for asymmetric reciprocal translocations. Two populations of S. saetabensis (S-046 and S-089) and the population of S. tragoriganum (S-056) contained heterozygotes and standard homozygotes. No homozygotes for the rearrangement (dicentric) were found. The meiotic behavior of the heterozygotes showed great stability of the dicentric chromosomes in both species due to strict control of meiosis at three levels: (1) chiasma formation, (2) multivalent coorientation at metaphase I, (3) dicentric chromatid separation at anaphase II. During mitosis there may also be strict control of dicentric chromatid separation through 100% parallel separation without interlocking. This stable polymorphism for asymmetric reciprocal translocations is a unique phenomenon that seems to be maintained by over-dominance, thus being a special case of linkage disequilibrium. We give two alternative hypotheses to explain the origin of these polymorphisms and discuss their evolutionary significance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00329506
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  • 2
    Electronic Resource
    Electronic Resource
    Digestion of centromeric DNA from each human metaphase chromosome by the 6 bp-restriction enzyme StuI (1993)
    Springer
    Histochemistry and cell biology 99 (1993), S. 453-456 
    Details
    ISSN: 1432-119X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Although 6 bp-restriction endonucleases infrequently cut DNA, we describe in this paper the banding pattern induced by one of them, StuI (AGGCCT), on fixed human chromosomes. This enzyme is the first 6 bp-restriction endonuclease demonstrated to be able to digest human heterochromatin. It causes the extraction of two families of repeated DNA, the alpha satellite DNA and the 3.4 kb HaeIII family (DYZ1). On the other hand, digestions with StuI and with another two enzymes, HinfI and RsaI, have established the distribution of sequences within the heterochromatic block of chromosome 3.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00274097
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  • 3
    Electronic Resource
    Electronic Resource
    Partial trisomy 14q (1979)
    Springer
    Human genetics 〈Berlin〉 46 (1979), S. 243-247 
    Details
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary A dysmorphic female born with partial trisomy of the proximal segment of the long arm of chromosome 14 had 47 chromosomes. The extra one was acrocentric, smaller than the D group, and bigger than the G-chromosome group. By GTG banding it was identified as a deleted chromosome 14, the karyotype being 47,XX,+del 14(q24). Chromosome analysis of the parents was normal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00291928
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  • 4
    Electronic Resource
    Electronic Resource
    Morvan's fibrillary chorea: remission after plasmapheresis (1996)
    Springer
    Journal of neurology 243 (1996), S. 350-353 
    Details
    ISSN: 1432-1459
    Keywords: Morvan's fibrillary chorea ; Neuromyotonia ; Isaacs' syndrome ; Plasmapheresis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We evaluated the effects of plasmapheresis in two patients with Morvan's fibrillary chorea, one of whom had sigmoid carcinoma, with oligoclonal bands in the cerebrospinal fluid, and modifications of the lipid-oxidative muscle pattern. The use of plasmapheresis in the treatment of Morvan's fibrillary chorea has not been reported previously and in our patients improved the symptoms markedly.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00868410
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  • 5
    Electronic Resource
    Electronic Resource
    Biochemical findings in a patient with neonatal methylmalonic acidaemia (1982)
    Springer
    Journal of inherited metabolic disease 5 (1982), S. 53-54 
    Details
    ISSN: 1573-2665
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01799825
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  • 6
    Electronic Resource
    Electronic Resource
    Phylogenetic relationships in theSideritis leucantha group (Lamiaceae) (1986)
    Springer
    Plant systematics and evolution 152 (1986), S. 167-183 
    Details
    ISSN: 1615-6110
    Keywords: Angiosperms ; Lamiaceae ; Sideritis ; Meiotic behaviour ; karyotypes ; size and fertility of pollen grains ; DNA values ; seed protein electrophoresis ; phylogenetic relationships
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Six closely related taxa of the sect.Eusideritis of the genusSideritis (S. leucantha, S. pusilla, S. flavovirens, S. granatensis, S. biflora andS. osteoxylla) are analysed to elucidate their phylogenetic relationships and position within the sect.Eusideritis. Meiotic behaviour, karyotype features, size and fertility of pollen grains, DNA amounts and seed protein profiles are reviewed. A polyploid origin of the group (from x = 7) and the further diversification through dysploidy and chromosome repatterning is postulated.S. osteoxylla is apparently of hybrid origin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00989425
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  • 7
    Electronic Resource
    Electronic Resource
    Karyology and evolution inSesamoides (Resedaceae) (1981)
    Springer
    Plant systematics and evolution 139 (1981), S. 147-154 
    Details
    ISSN: 1615-6110
    Keywords: Resedaceae ; Sesamoides ; Meiosis (PMC) ; meiotic abnormalities ; size and fertility of pollen ; autopolyploidy ; chromosome base number
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The meiotic behaviour abnormalities, fertility and size of pollen of 6 taxa ofSesamoides have been analysed. Besides diploids (2x), polyploids (4x, 6x, 8x) have been found. The chromosome base number is x = 10, but an origin from x = 5 is suggested.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00983929
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  • 8
    Electronic Resource
    Electronic Resource
    The nature of polyploidy inReseda sect.Leucoreseda (Resedaceae) (1983)
    Springer
    Plant systematics and evolution 142 (1983), S. 223-237 
    Details
    ISSN: 1615-6110
    Keywords: Angiosperms ; Resedaceae ; Reseda ; DNA values ; meiotic analysis ; seed protein and esterase isozyme electrophoresis ; polyploidy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We have found two chromosome levels (n = 10 and n = 20) in Spanish species ofReseda sect.Leucoreseda, four species on the first (R. undata, R. paui, R. suffruticosa, R. barrelieri), only one on the second level (R. alba). As already the species with n = 10 apparently behave as polyploids, we propose x = 5 as the original basic chromosome number for this section. The seed protein profile ofR. alba (2n = 40) reveals close relationships withR. undata (2n = 20), while the esterase isozymes suggest affinities withR. paui (2n = 20). Thus,R. alba can be regarded either as an autopolyploid fromR. paui or more likely as an allopolyploid fromR. paui andR. undata. Finally, the DNA values suggest a diploidization process inR. alba since its origin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00985900
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  • 9
    Electronic Resource
    Electronic Resource
    Time-dependent AluI action on human chromosomes (1991)
    Springer
    Genetica 84 (1991), S. 191-194 
    Details
    ISSN: 1573-6857
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We have analyzed the pattern of AluI digestion over time on human chromosomes in order to monitor the evolution of the in situ enzyme action. Short treatments followed by Giemsa staining produce a G-like banding effect, whereas longer treatments produce a C-like banding pattern. However, when Propidium iodide staining is used, it reveals a uniform bright fluorescence after short AluI digestions and C bands when longer treatments are developed. We propose that C banding is the result of a uniform DNA removal in non centromeric regions taking place after a critical time point, the initial G like banding being produced by changes in the DNA-proteins interactions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00127246
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  • 10
    Electronic Resource
    Electronic Resource
    Intra- and interspecific variations in nuclear parameters of two closely related species of Narcissus L. (1990)
    Springer
    Genetica 82 (1990), S. 25-31 
    Details
    ISSN: 1573-6857
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Nuclear DNA amount, nuclear area, genome volume and karyotype length were analysed in different populations of two closely related species of Narcissus. There are intra- and interspecific variations in these parameters. 4C DNA amount and karyotype length, on one hand, and 2C DNA amount and telophase nuclear area, on the other, are not correlated. It seems that DNA content and chromosome length are independent parameters. However, 4C DNA content and karyotype volume are correlated, and are also correlated to different density estimations (4C DNA to Kar.length & 2C DNA to telophase area). These facts suggest that the relative length of the chromosomes is genetically controlled and that it is independent of the DNA that they contain. It seems that the interpopulational differences in DNA content are correlated with length changes of small segments in almost all chromosomes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00057670
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