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  • Digitale Medien  (3)
  • GC- rich heterochromatin  (1)
  • Molecular Cell Biology  (1)
  • fish cytogenetics  (1)
  • lake trout  (1)
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  • Digitale Medien  (3)
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  • 1
    Digitale Medien
    Digitale Medien
    Microdissection of the Y chromosome and fluorescencein situ hybridization analysis of the sex chromosomes of lake trout,Salvelinus namaycush (1995)
    Springer
    Chromosome research 3 (1995), S. 221-226 
    Details
    ISSN: 1573-6849
    Schlagwort(e): fluorescencein situ hybridization ; lake trout ; microdissection ; sex chromosomes
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Lake trout,Salvelinus namaycush, is one of the few salmonids with morphologically differentiated sex chromosomes. Genetic analysis suggested that the sex-determining region of this species lies on the short arm of the Y chromosome. The differential arm of the Y chromosome was microdissected and the resulting DNA amplified in a sequence-independent manner. Amplified DNA was biotin labeled as a probe for fluorescencein situ hybridization (FISH). Strong hybridization signals were seen covering defined regions of both the Y and X chromosomes. Homeologous chromosomes of the ancestrally tetraploid genome were not identified by FISH with the Y probe, indicating diploidization of this region of the genome.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00713046
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Chromosomal Characteristics of Ribosomal DNA in the Primitive Semionotiform Fish, Longnose Gar Lepisosteus osseus (1999)
    Springer
    Chromosome research 7 (1999), S. 475-480 
    Details
    ISSN: 1573-6849
    Schlagwort(e): chromomycin A3-banding ; FISH ; fish cytogenetics ; GC- rich heterochromatin ; longnose gar
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract The chromosomes of longnose gar, Lepisosteus osseus, an extant representative of early radiation of actinopterygian fishes, were studied using conventional Giemsa-staining, Ag-staining, CMA3-fluorescence and fluorescence in-situ hybridization (FISH). The diploid chromosome number was 2n = 56 and the karyotype contained 11 pairs of metacentric, 6 pairs of submetacentric, 3 pairs of subtelocentric macrochromosomes and 16 microchromosomes. Nearly all macrochromosomes showed large CMA3-positive regions resembling the R-bands of higher vertebrates, indicating extensive distribution of GC-rich DNA along chromosomes. The nucleolar organizer regions (NORs) were located on the end of the short arm of a single small metacentric macrochromosomal pair. These sites were strongly CMA3-positive, suggesting that ribosomal sites are associated with GC- rich DNA. In-situ hybridization (FISH) with a rDNA probe gave consistently positive signals in the same regions detected by Ag- staining and CMA3-fluorescence. The evolutionary conservation of positive CMA3-fluorescence of ribosomal sites in ‘holostean’ and teleostean fishes is discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1009202030456
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  • 3
    Digitale Medien
    Digitale Medien
    The biochemistry of an acetylcholine receptor (1974)
    New York, N.Y. : Wiley-Blackwell
    Journal of Supramolecular Structure 2 (1974), S. 582-592 
    Details
    ISSN: 0091-7419
    Schlagwort(e): Life Sciences ; Molecular Cell Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Chemie und Pharmazie , Medizin
    Notizen: The acetylcholine receptor from Torpedo californica electroplax has been studied at three levels of molecular organization: receptor-rich membrane fragments, solubilized and purified receptor, and reconstituted receptor in phospholipid vesicles. The binding of cholinergic ligands to the membrane-bound and the solubilized material is not cooperative, and the number of ligand sites is less than the number of toxin sites. In addition, the purified macromolecule contains the molecular features necessary for ion-translocation during postsynaptic depolarization, since a chemically excitable membrane can be formed from purified receptor and Torpedo phospholipids.
    Zusätzliches Material: 10 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jss.400020506
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