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  • 1
    Digitale Medien
    Digitale Medien
    Springer
    Chromosoma 49 (1975), S. 321-331 
    ISSN: 1432-0886
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Abstract Synaptonemal polycomplexes are described for the first time in Drosophila melanogaster females. They were found in apparently degenerating 16-cell clusters in germarial region two of females heterozygous for the c(3)G 17 mutation. The remaining 16-cell clusters in the germaria were normal in appearance. In a single case a polycomplex was found in the cytoplasm, presumably due to the breakdown of the nuclear envelope. In all other cases, the polycomplexes were closely associated with the nucleolus. The role of the nucleolus in the formation of polycomplexes as well as the possibility that these polycomplexes are normal features of the meiotic prophase in Drosophila are discussed.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Springer
    Cell & tissue research 140 (1973), S. 125-144 
    ISSN: 1432-0878
    Schlagwort(e): Spermatogenesis ; Meiosis ; Drosophila melanogaster ; Synaptinemal complex ; Electron microscopy
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary Meiosis in male Drosophila melanogaster was studied with the electron microscope. The number and the distribution of ring channels between individual members of a cluster of primary spermatocytes was determined from serial sections. The tubules with a diameter of 45 nm characteristic for meiotic prophase nuclei gave a chromatin type reaction, when treated with EDTA according to Bernhard's technique, thus suggesting that these tubules contain DNA. A material resembling central regions of synaptinemal complexes was observed in the nucleolus of primary spermatocytes during the downward movement in the testis. It is suggested that they represent unused precursors to central components of synaptinemal complexes, which are absent at pachytene of Drosophila males. Up to six tail fibers (kinetosomes + axonemes) were observed in every primary spermatocyte prior to meiosis.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    ISSN: 0749-503X
    Schlagwort(e): Genome sequencing ; Saccharomyces cerevisiae ; chromosome XI ; NUP100 ; nucleoside diphosphate kinase ; tRNA-His ; tRNA-Val ; tRNA-Trp ; intron ; Life and Medical Sciences ; Genetics
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie
    Notizen: The complete DNA sequence of cosmid clone pEKG080 comprising 20 723 base pairs was determined from an ordered set of subclones. The sequence contains nine open reading frames (ORFs) longer than 100 amino acids. The deduced amino acid sequence of YKL067 exhibits significant similarity to nucleoside diphosphate kinases from a number of species and probably represents this gene in yeast. YKL068 is identical to the NUP100 gene recently cloned and sequenced. The gene codes for a nuclear pore complex protein. YKL073 is identical to Hsp70 proteins from yeast and Hydra at about 20% of the amino acids. The significance of this similarity is uncertain. The remaining six ORFs do not share homology with known proteins. Three tRNAs for histidine, valine and tryptophan respectively were identified, the latter interrupted by a 34 bp intron. Solo delta sequences were found at three locations. The nucleotide sequence data have been deposited in the EMBL and GenBank data libraries under Accession Number X75780.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 4
    ISSN: 0749-503X
    Schlagwort(e): genome sequencing ; Saccharomyces cerevisiae ; chromosome X ; SME1 ; MEF2 IME2 ; GSH1 ; CSD3 ; TCP-1 ; DAL80 ; EF2 ; EFG ; tRNA-Arg ; Life and Medical Sciences ; Genetics
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie
    Notizen: The complete DNA sequence of cosmid clone p59 comprising 37,549 bp derived from chromsome X was determined from an ordered set of subclones. The sequence contains 14 open reading frames (ORFs) containing at least 100 consecutive sense codons. Four of the ORFs represent already known and sequenced yeast genes: B645 is identical to the SME1 gene encoding a protein kinase, required for induction of meiosis in yeast, D819 represents the MEF2 gene probably encoding a second mitochondrial elongation factor-like protein, D678 is identical to the yeast GSH1 gene encoding γ-glutamylcysteine synthetase and B746 is identical to the CSD3 gene, which plays an as yet unidentified role in chitin biosynthesis and/or its regulation. The deduced amino acid sequence of A550 is 63% identical to the Ccη subunit of a murine TCP-1-containing chaperonin and more than 35% identical to thermophilic factor 55 from Sulfolobus shibatae, as well as to a number of proteins belonging to the chaperonin TCP-1 family. Open reading frame F551 exhibits homology to two regions of the DAL80 gene located on yeast chromosome XI encoding a pleiotropic negative regulatory protein. In addition, extensive homology was detected in three regions including parts of ORFs A560, B746/CSD3 and the incomplete ORF C852 to three consecutive ORFs of unknown function in the middle of the right arm of chromosome XI. Finally, the sequence contained a tRNAArg3 (AGC) gene. The nucleotide sequence data reported in this paper have been deposited in the EMBL and GenBank databases under the accession number X85021.
    Zusätzliches Material: 7 Ill.
    Materialart: Digitale Medien
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  • 5
    ISSN: 0749-503X
    Schlagwort(e): Genome sequencing ; Saccharomyces cerevisiae ; chromosome XI ; FBA1 ; TFIIA ; TOA2 ; Life and Medical Sciences ; Genetics
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie
    Notizen: The complete DNA sequence of cosmid clone pUKG148 comprising 28 600 base pairs was determined from an ordered set of subclones. The sequence contains 22 open reading frames longer than 100 amino acids of which five are entirely covered by other, longer reading frames. YKL054 exhibits 25% homology at the amino acid level to a number of plant storage proteins of the glutenin type, YKL056 is 40% homologous to a translationally controlled mammalian tumour protein, YKL058 (TOA2) is identical to the small subunit of transcription factor TFIIA from yeast and YKL060 is identical to the FBA1 gene also from yeast, already sequenced but not mapped to chromosome XI. The remaining 13 open reading frames show weak or no homology to known genes. The nucleotide sequence data have been deposited in the EMBL and GenBank data libraries under Accession Number X75781.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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