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  • 1
    Digitale Medien
    Digitale Medien
    Springer
    Cellular and molecular life sciences 39 (1983), S. 201-202 
    ISSN: 1420-9071
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary The karyotypes ofDendrocopos major andD. medius show a gradual transition from macro- to microchromosomes and a high diploid chromosome number. The Z-chromosome is the largest element.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Springer
    Cellular and molecular life sciences 38 (1982), S. 809-811 
    ISSN: 1420-9071
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary It was observed that in the fishCoris julis L., in its natural environment, both primary and secondary males take part in reproduction. Chromosome studies showed 23 homologous chromosome pairs, which are identical in males and females, and a variable 24th pair. The heteromorphism of this pair is identical in secondary males and in the majority of females; these are presumably the females that can undergo sex inversion. Primary males show a different heteromorphism of the same pair.
    Materialart: Digitale Medien
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  • 3
    Digitale Medien
    Digitale Medien
    Springer
    Cellular and molecular life sciences 41 (1985), S. 1515-1517 
    ISSN: 1420-9071
    Schlagwort(e): Human IVF-ET ; human sterility ; bioethics ; medical issues ; legislation ; research
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Springer
    Naturwissenschaften 73 (1986), S. 671-672 
    ISSN: 1432-1904
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie , Allgemeine Naturwissenschaft
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 5
    ISSN: 1433-0474
    Schlagwort(e): Schlüsselwörter Prader-Willi-Syndrom ; Angelman-Syndrom ; Methylierungsspezifische Polymerasekettenreaktion (M-PCR) ; Genomic imprinting ; Keywords Prader-Willi syndrome ; Angelman syndrome ; Methylation-specific polymerase chain reaction (M-PCR) ; Genomic imprinting
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Summary Background. The methylation-specific polymerase chain reaction (M-PCR) is a new method for investigating patients with Prader-Willi and Angelman syndrome. This paper reports a modification of the M-PCR method to replace the conventional gel electrophoresis by automatic high voltage capillary electrophoresis resulting in increased sensitivity and simplified handling. Method and patients: We investigated blood samples of 31 patients with clinical features of Prader-Willi syndrome, 20 patients with clinical features of Angelman syndrome and 25 control individuals. 5 samples of Prader-Willi patients and 11 samples of Angelman patients had previously been analysed by the conventional Southern blot technique. Results. The clinical diagnosis was confirmed in 3 of 31 Prader-Willi patients (9,68%) and in 8 of 20 Angelman patients (40%). The 25 control individuals all showed normal results. The data obtained by M-PCR and Southern blot analysis showed 100% concordance. Conclusions. The modified M-PCR method improves rapidity, reliability and profitability and is very valuable for the investigation of children with clinical suspicion of Prader-Willi or Angelman syndrome.
    Notizen: Zusammenfassung Hintergrund. Die methylierungsspezifische Polymerasekettenreaktion (M-PCR) ist eine neue Labormethode zur Diagnose des Prader-Willi- und des Angelman-Syndroms. Im vorgestellten Verfahren wurde die konventionelle Gelelektrophorese durch eine automatisierte Hochspannungskapillarelektrophorese ersetzt, mit dem Ziel die Sensitivität zu erhöhen und die Handhabung der M-PCR zu vereinfachen. Methode und Patienten. Es wurden 31 Blutproben von Patienten mit dem klinischen Verdacht auf ein Prader-Willi-Syndrom, 20 Blutproben von Patienten mit dem Verdacht auf ein Angelman-Syndrom sowie 25 Blutproben von Kontrollpersonen mit der M-PCR untersucht. Bereits früher waren 5 Proben von Prader-Willi- und 11 Proben von Angelman-Patienten mir der herkömmlichen Southern-Blot-Technik analysiert worden. Ergebnisse. Bei 3 der 31 Blutproben von Patienten mit Verdacht auf ein Prader-Willi-Syndrom (9,68%) und bei 8 der 20 Blutproben von Patienten mit Verdacht auf ein Angelman-Syndrom (40%) konnte die klinische Diagnose bestätigt werden. Die 25 Kontrollpersonen zeigten in allen Fällen ein normales Resultat. Die früher mit der Southern-Blot-Technik erzielten Resultate ließen sich durchweg bestätigen. Schlussfolgerung. Dank der Schnelligkeit, Zuverlässigkeit und Wirtschaftlichkeit hat sich die vorgestellte M-PCR-Methode zur routinemäßigen Abklärung von Kindern mit klinischem Verdacht auf das Vorliegen eines Prader-Willi- oder Angelman-Syndroms bewährt.
    Materialart: Digitale Medien
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  • 6
    Digitale Medien
    Digitale Medien
    Springer
    Anatomy and embryology 161 (1980), S. 19-27 
    ISSN: 1432-0568
    Schlagwort(e): Surface characteristics ; Oocytes ; Mouse ; Scanning Electron Microscopy
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary The in vivo and in vitro development of the zona pellucida as well as the vitelline membrane surface of oocytes isolated from juvenile mice aged between 8 and 30 days p.p. were investigated by scanning electron microscopy. In vivo a consistent development of the zona pellucida surface can be observed, namely the formation of a fibrous network like structure interspersed with numerous pores. After enzymatic removal of the zona pellucida the surface of the vitelline membrane was studied. In “normal” oocytes with intact germinal vesicles, microvilli were distributed over the entire oocyte surface in all age groups investigated. After resumption of meiosis in vitro a characteristic differentiation on the vitelline membrane occurs. A glabrous polar region appears in primary oocytes and a glabrous polar body in secondary oocytes. The same differentiation in surface organization could be observed in the in vivo precociously matured oocytes.
    Materialart: Digitale Medien
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  • 7
    Digitale Medien
    Digitale Medien
    Springer
    Anatomy and embryology 161 (1980), S. 9-18 
    ISSN: 1432-0568
    Schlagwort(e): Cytogenetics ; Oocytes ; Development ; Mouse
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary Oocytes were isolated by mechanical disruption of the ovarian tissue of juvenile mice aged between 8 and 28 days p.p. Different types of oocytes could be distinguished by direct observation using an inverted light microscope. Their relative amount within the oocyte population isolated was determined in relation to age of the animals. The following types were isolated and examined: 1. “Normal” oocytes containing an intact germinal vesicle (that is, a nucleus in dictyate stage). In all age groups 55 to 83% of the oocytes were of this type. Their nuclear developmental stage was determined by studying their capacity to resume meiosis in culture as a function of age. 45% of the oocytes isolated from 15 day old mice were competent to resume meiosis. In mice aged 21 days more than 80% of the oocytes measuring about 80 μm in diameter resumed meiosis in vitro. No further increase in mean diameter or in the amount of competent oocytes could be found in older mice. 2. Degenerating oocytes. Five different types could be distinguished. a) “Atretic” oocytes present in all age groups investigated with pyknotic or disintegrating nuclei; b) “Precociously matured” oocytes first observed in mice aged 15 days containing normal diakinesis-and metaphase II-chromosomes; c) “Vacuolized” oocytes first isolated on day 18 having metaphase II-chromosomes scattered within the cytoplasm; d) “Fragmented” oocytes also first observed 18 days p.p. containing chromatin dissociated into micronuclei of different sizes within the cytoplasmic fragements; e) “Ghost” oocytes present in all age groups, characterized by the disintegration of the cytoplasm so that only the surrounding zona pellucida can be clearly seen.
    Materialart: Digitale Medien
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  • 8
    ISSN: 1432-0584
    Schlagwort(e): Bone marrow transplantation ; Chronic granulocytic leukemia
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary Six patients with Philadelphia-chromosome (Ph' +)-positive chronic granulocytic leukemia were transplanted from their HLA-identical siblings after conditioning with cyclophosphamide and 1'000 rad total body irradiation. All received cyclosporin-A for prophylaxis of Graft-versus-Host disease. All patients showed prompt engraftment and all are cytogenetically and clinically in complete remission. Two patients had transient mild signs of Graft-versus-Host-disease and one patient had unilateral facial nerve paresis of unknown origin. All are ambulatory and well 6–18 months (median 10 months) after transplantation.
    Materialart: Digitale Medien
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  • 9
    Digitale Medien
    Digitale Medien
    Springer
    Cellular and molecular life sciences 43 (1987), S. 375-378 
    ISSN: 1420-9071
    Schlagwort(e): Human gene therapy ; medical and ethical issues ; hereditary diseases ; gene transfer systems ; in vitro fertilization ; embryo transfer
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary Gene therapy provides new options for medicine, and implies new responsibilities for making decisions relating to the limitations which reason and morality impose upon manipulation of the human genome for the benefit both of patients and of society. This contribution outlines the possibilities and limits of gene therapy in man from a medico-technical viewpoint.
    Materialart: Digitale Medien
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  • 10
    Digitale Medien
    Digitale Medien
    Springer
    Cellular and molecular life sciences 44 (1988), S. 169-171 
    ISSN: 1420-9071
    Schlagwort(e): Dysplastic naevus syndrome ; DNA-repair ; cancer genes ; familial malignant melanoma ; monoclonal antibodies specific for UV-dimers
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary Dysplastic naevus syndrome (DNS) is frequently observed in association with familial melanoma and xeroderma pigmentosum (XP), but the role of UV-light in the development of DNS has not been elucidated. Previous work has shown that UV-induced unscheduled DNA synthesis is associated with the early loss of antigenicity observed in immunoassays using a monoclonal antibody specific for thymine-thymine dimers. We now show that the rate of loss of antigenicity, which reflects the relative amount of bound antibody, observed during the first 60 min following 10 Jm−2 UVC irradiation is significantly reduced (p=0.02) in cultures of fibroblasts from 7 out of 8 DNS patients compared with the results from cells of a group of 30 healthy volunteers. This observation suggests an early event in excision repair is altered in the majority of DNS patients.
    Materialart: Digitale Medien
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