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  • 1
    Digitale Medien
    Digitale Medien
    Amsterdam : Elsevier
    Comparative Biochemistry and Physiology -- Part B: Biochemistry and 67 (1980), S. 561-568 
    ISSN: 0305-0491
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Biologie , Chemie und Pharmazie
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Springer
    Monatsschrift Kinderheilkunde 146 (1998), S. 93-96 
    ISSN: 1433-0474
    Schlagwort(e): Schlüsselwörter Williams-Beuren-Syndrom ; Entwicklungsverzögerung ; Nierenfehlbildung ; Herzfehler ; Kleinwuchs ; Key words Williams-Beuren syndrome ; Mental retardation ; Renal malformation ; Congenital heart defect ; Short stature
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Summary Williams-Beuren syndrome is a multiple malformation syndrome with autosomal dominant inheritance and variable expression. Characteristic symptoms are congenital heart defects (typically supravalvular aortic stenosis in combination with peripheral pulmonary stenoses), primary psychomental retardation, distinct facial features, malformations of the kidney or urinary tract, failure to thrive and gastrointestinal symptoms in infancy and early childhood, and short stature (50% of patients). We report on a young man with Williams-Beuren syndrome in whom the dignosis was made late at the age of 24 years. During infancy poor suckling and recurrent vomiting were noted. Psychomental development was retarded. The patient showed a hypersensitivity to noise and music. Renal scarring was seen on the right side and a duplicated ureter on the left. Surgical antireflux treatment was performed at age 12 years. The patient attended a school for mentally handicapped children and is now working with an institutionalized group. At the age of 24 the typical facial features of an adult with Williams-Beuren syndrome were seen, but no congenital heart defect. By molecular genetic analysis we demonstrated hemizygosity for the elastin locus and thus confirmed the clinical diagnosis of Williams-Beuren syndrome. Discussion: This observation demonstrates that the diagnosis of Williams-Beuren syndrome may be markedly delayed in the absence of a cardiovascular defect. The combination of typical craniofacial signs, primary mental and psychomotor retardation, poor suckling and gastrointestinal symptoms in infancy and early childhood, and malformations of the kidneys and/or the urinary tract should prompt consideration of Williams-Beuren syndrome.
    Notizen: Zusammenfassung Das Williams-Beuren-Syndrom wird mit variabler Expressivität autosomal-dominant vererbt. Es ist charakterisiert durch den typischen Herzfehler, die supravalvuläre Aortenstenose, welche häufig mit peripheren Pulmonalstenosen kombiniert ist. Weitere charakteristische Symptome sind die primäre psychomentale Retardierung, die typische kraniofaziale Dysmorphie und Fehlbildungen der Nieren oder ableitenden Harnwege. Im Säuglings- und Kleinkindesalter treten Gedeihstörung sowie gastrointestinale Auffälligkeiten wie rezidivierendes Erbrechen und Durchfälle auf. 50% der Patienten sind kleinwüchsig. Wir berichten über einen jungen Mann mit Williams-Beuren-Syndrom, bei dem diese Diagnose erst im Alter von 24 Jahren gestellt wurde. In der Säuglingszeit bestanden Trinkschwäche und rezidivierendes Erbrechen. Die psychomentale Entwicklung verlief primär verzögert. Anamnestisch wurde von einer ausgeprägten Geräuschempfindlichkeit und einem guten Musikempfinden berichtet. Es bestehen eine Schrumpfniere rechts und ein gedoppeltes Nierenbecken links. Im Alter von 12 Jahren wurde eine Antirefluxplastik durchgeführt. Der Patient besuchte die Sonderschule L und arbeitet jetzt in einer beschützenden Werkstatt. Mit 24 Jahren zeigte der Patient die charakterisitische kraniofaziale Dysmorphie eines Erwachsenen mit Williams-Beuren-Syndrom. Ferner fiel sein für das Syndrom typisches freundlich zugewandtes Verhalten auf. Eine primäre kardiovaskuläre Fehlbildung konnte allerdings ausgeschlossen werden. Die Diagnose wurde durch den molekulargenetischen Nachweis der Hemizygotie für den Elastinlocus bestätigt. Diskussion: Dieser Fall belegt eindrücklich, daß die Diagnosestellung bei Patienten mit Williams-Beuren-Syndrom, die nicht den typischen Herzfehler aufweisen, trotz einer ansonsten pathognomonischen Befundkonstellation stark verzögert sein kann. Die Kombination aus typischer kraniofazialer Dysmorphie, primärer statomotorischer und mentaler Retardierung, unerklärter Trinkschwäche und rezidivierendem Erbrechen mit Gedeihstörung sollte auch ohne zusätzliche Fehlbildungen im Bereich von Nieren und ableitenden Harnwegen an die Diagnose Williams-Beuren-Syndrom denken lassen.
    Materialart: Digitale Medien
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  • 3
    ISSN: 1433-0474
    Schlagwort(e): Schlüsselwörter APC-Resistenz ; Säugling ; Thrombus der Pulmonalarterie ; Key words APC-Resistence ; Infant ; Thrombosis of the Pulmonary Artery
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Summary A clinically healthy 6 week old infant underwent cardiological examination because of a slight heart murmur. On echocardiography, we detected a round thrombus of 4 millimeters diameter originating in the ductus arteriosus Botalli and extending into the pulmonary artery. Molecular testing (PCR amplification method) revealed a heterozygous mutation responsible for factor V Leiden. No additional risk factors could be detected neither in the case history nor in the laboratory findings. The clinical course until the age of 17 months remained normal. She was not treated, but a prophylactical anticoagulation is recommended for the case of risk situations (surgery, menstruation, pregnancy). Discussion: Until now carriers of the factor V Leiden were divided into symptomatic patients and healthy carriers. Our case shows, that heterozygous APC-resistance may cause asymptomatic thrombosis in seemingly healthy neonates.
    Notizen: Zusammenfassung Es wird über einen klinisch gesunden, 6 Wochen alten Säugling berichtet, der aufgrund eines leisen Herzgeräusches kardiologisch untersucht wurde. Echokardiographisch fand sich ein rundlicher, aus dem Ductus arteriosus in die Pulmonalarterie reichender Thrombus von 4 mm Durchmesser. Wir konnten molekulargenetisch eine heterozygote APC-Resistenz nachweisen. Zusätzliche Risikofaktoren fanden sich weder in der Anamnese noch unter den untersuchten Laborparametern. Der bisher beobachtete Verlauf bis zum Alter von 17 Monaten blieb komplikationslos. Es erfolgte keine Therapie, sondern eine Beratung der Familie zu einer prophylaktischen Antikoagulation in Risikosituationen (z.B. operative Eingriffe, Wochenbett). Diskussion: Bislang erfolgte eine Unterteilung der Träger des Faktor-V-Leiden in symptomatische Patienten und asymptomatische Träger. Unser Fall zeigt, daß die heterozygote APC-Resistenz auch asymptomatische Thrombosen bei anscheinend gesunden Neugeborenen verursachen kann.
    Materialart: Digitale Medien
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  • 4
    ISSN: 1432-2056
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary Samples of Antarctic krill Euphausia superba from 16 locations in the Weddell Sea, Scotia Sea and on the west coast of the Antarctic Peninsula were analysed for protein variation using enzyme electrophoresis techniques. Analysis of allele distributions indicate that samples from all locations are part of a single breeding population of krill. Significant departures from random mating expectations were observed in the distribution of electrophoretic phenotypes of the enzymes esterase and glucose phosphate isomerase. Possible explorations of these results are advanced, but they do not materially affect conclusions concerning population structure. The spatial and temporal distribution of electrophoretically detected genetic variation in Atlantic and Pacific sector krill stocks is discussed by comparing the results of this study with those of previous authors working with E. superba.
    Materialart: Digitale Medien
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  • 5
    ISSN: 1432-2056
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary Gangliosides and sialoglycoproteins from brain, liver and muscle have been isolated from 6 Antarctic fish species from the suborder Notothenoids and from 4 Arctic-boreal fish species. In addition freezing and melting points from serum of both groups were examined in order to determine the presence of protein antifreezes. In comparison with eurythermic fishes of temperate climates in both groups the phylogenetical adaptation to cold is correlated with a significantly higher concentration of gangliosides in the brain. The ganglioside concentration of liver in Antarctic fish, but not in Arctic species, is 3 to 5fold higher than in mammals (rat); in muscle the ganglioside content is increased only in red-blooded Antarctic fish as compared with mammals. The concentration of neuronal sialo-glycoproteins generally is lower in Antarctic fish than in other marine teleosts; in muscles the content is 2 to 3fold higher than in mammals. The molecular composition of brain gangliosides is characterized by an extreme high polarity which is due to an equipment with highly sialylated fractions (40 to 50% higher sialylated than tetrasialogangliosides). There are distinct differences between the freezing and melting point of blood serum, especially in the Antarctic species in favour of the existence of protein antifreezes. The results are discussed with regard to the fact that the extremely high polarity of brain gangliosides reflects a very efficient mechanism on molecular level to keep the neuronal membrane functional under low temperature conditions.
    Materialart: Digitale Medien
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  • 6
    Digitale Medien
    Digitale Medien
    Springer
    Polar biology 9 (1989), S. 533-539 
    ISSN: 1432-2056
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary Development of a comprehensive picture of the genetic population structure of the Antarctic krill (Euphausia superba) has been hampered by a lack of genetic data from two major areas of the species' distribution, the Bellingshausen Sea and the Ross Sea. Evidence from earlier studies of a discrete “Bellingshausen Sea” population was based on anomalous allele frequencies in two sample sets that were collected near the west coast of the Antarctic Peninsula rather than in the Bellingshausen Sea proper. In this paper we describe the first biochemical genetic data obtained on krill from the central Bellingshausen Sea and from the Ross Sea. Analyses of eight polymorphic loci in samples from these two areas have failed to provide any evidence of population structuring within the Pacific sector of the Southern Ocean, and have indicated that Pacific sector krill cannot be genetically discriminated from Atlantic sector krill or Indian Ocean sector krill. These findings further support the hypothesis of a single circumpolar breeding population of Antarctic krill.
    Materialart: Digitale Medien
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  • 7
    ISSN: 1432-2056
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary Specimens of Euphausia superba and of E. crystallorophias from different locations were analyzed electrophoretically for protein variation. The present study extends previous genetic studies on E. superba by analyzing samples from the East Wind Drift and repeat samples from the Bransfield Strait, Elephant Island and the Weddell Sea. E. crystallorophias was collected in the Weddell Sea and around the Antarctic Peninsula in order to provide information on the breeding structure of the species in this region. For all loki taking all sampling sites together for both species except GPI in E. crystallorophias no significant deviation of phenotype distributions from random mating expectations was observed. Furthermore, the allele distributions in all polymorphic loci for both species were found to be homogeneous. Estimates of genetic distance between samples within each species are low (0.0001 to 0.0003 in E. superba and 0.0001 to 0.0002 in E. crystallorophias), and are consistent with results expected for samples from a single interbreeding population. Estimate of genetic distance between these two species was 0.9729. These results suggest that for each species specimens from all locations investigated in the Bransfield Strait and Weddell Sea belong to a single genetically homogeneous population. A possible mechanism for maintaining such homogeneity and the implications for fishery management are discussed.
    Materialart: Digitale Medien
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  • 8
    ISSN: 1432-2056
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary The genus Themisto is represented in Atlantic Ocean waters by four different species: T. compressa, T. abyssorum, and T. libellula in the northern hemisphere and T. gaudichaudii in the southern hemisphere. Examination of morphological and electrophoretic characters has revealed that T. gaudichaudii, which was previously thought to have a bipolar distribution, in fact consist of separate species in Arctic and Antarctic waters, respectively. The Antarctic species remains as T. gauchichaudii Guérin 1828 and the oldest available name for the Arctic species is T. compressa Goes 1865. The results of the study also indicate that morphological variation within T. gaudichaudii (e.g. the “compressa” and “bispinosa” forms) is more likely to be the result of environmental influences rather than genetic differences. Electrophoretic analyses of genetic variation indicate that T. gaudichaudii from waters adjacent to both South Georgia Island and the South Shetland Islands belong to the same interbreeding population. Similar observations of homogeneity in other Antarctic pelagic animals suggest that the Antarctic circumpolar current systems promote effective genetic exchange and reduce the possibility of formation of distinct local breeding populations.
    Materialart: Digitale Medien
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  • 9
    ISSN: 1432-0584
    Schlagwort(e): EBV ; Hodgkin's disease ; Proliferation Prognosis
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary The role of Epstein-Barr virus (EBV) in the pathogenesis of Hodgkin's disease (HD) has not yet been clarified. Using RNA in situ hybridization (ISH) and immunohistochemistry (IHC), the occurrence of small Epstein-Barr virus encoded RNA (EBER) and latent membrane protein-1 (LMP-1) was studied in 22 tissue samples from 21 patients between 4 and 17 years of age with Hodgkin's disease. EBER was detected in eight of 21 patients (38%) in Hodgkin and Reed-Sternberg cells and reactive lymphocytes irrespective of initial clinical stage and histological subtype, whereas LMP-1, positive in ten of 21 patients (48%), was restricted to neoplastic cells. All cases positive for EBER expressed LMP-1 as well. Additionally, oncoprotein Bcl-2 was identified in nine of 21 patients (43%), indicating, besides immortalization of HD cells by EBV, a further growth advantage due to apoptosis prevention by overexpression of this protein. Proliferation-associated antigens Ki-S1 and Ki-S5 were highly expressed in Hodgkin and Reed-Sternberg cells. CD 30 antigen was found in most cases, using two different antibodies (90% and 80%). The presence of this protein, which belongs to the family of nerve growth factor receptor (NGFR), is related to high expression of Ki-67 protein, detected by Ki-S5. CD 20 antigen was detectable in only three of 21 patients (14%). If we compare results of ISH and IHC with clinical data, the occurrence of EBV genome in children with HD seems to have no adverse effect on the final outcome of these patients.
    Materialart: Digitale Medien
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  • 10
    ISSN: 1432-1076
    Schlagwort(e): Key words ITP ; von Willebrand disease ; DDAVP
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Materialart: Digitale Medien
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