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  • 1985-1989  (4)
  • 1
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] When starfish oocytes arrested at the first meiotic prophase are released by hormonal stimulation, they undergo two nuclear divisions13'14. A protein kinase that is independent of Ca2+ and cyclic nucleotides, phosphorylates serines and threonines, and uses HI-histone as an in vitro substrate, ...
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 327 (1987), S. 170-172 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In starfish, as in many species, the oocyte is arrested in late G2. Meiotic maturation is triggered by 1-methyladenine, a hormone produced by the follicle cells11. Fully grown oocytes treated with 1-methyladenine eliminate two polar bodies and arrest at interphase with the female pronucieus intact, ...
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1439-0973
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Die Gallenausscheidung von Cefotaxime (CTX) und dessen Metaboliten Desacetylcefotaxime (DSCTX) werden bei 9 kürzlich cholezystektomierten Patientinnen nach einer intravenösen Injektion von 15 mg/kg Körpergewicht CTX gemessen. Die gesamte Galle wurde durch ein spezielles Vorgehen gesammelt: der aufgeblasene Ballon eines Fogarty Katheters wurde in den distalen Zweig eines Kehr-T-Drains eingeführt. Die biliäre Clearance des CTX und des DSCTX wurde während 8 Stunden gemessen. Die CTX-Konzentration erreichte Spitzenwerte von 34,5 ± 15,3 mg/l 90 Minuten nach der Injektion. Diese Werte sanken auf 2,7 ± 1,7 mg/l nach 7–8 Stunden. DSCTX erreichte seine Spitzenkonzentration zur gleichen Zeit mit 49,3 ± 1,7 mg/l und fiel auf 4,6 ± 3,2 mg/l nach 8 Stunden. Das Konzentrationsverhältnis Galle/Serum von CTX und DSCTX blieb bei 1 während der ganzen Probezeit (Mittelwerte 1,35 ± 1,08 bis 11,0 ± 3,1). Die biliäre Clearance von CTX war 0,190 ml/min. Die Gesamtmenge an in der Galle ausgeschiedenem CTX und DSCTX betrug 1050 ± 472,8 µg bzw. 1902,7 ± 804,1 µg (0,093 ± 0,041% bzw. 0,186 ± 0,077% der Dosis). Wenn man die minimalen Hemmkonzentrationen der häufigsten Erreger bei biliärer Sepsis betrachtet, scheint CTX ein geeignetes Antibiotikum für die Behandlung von biliären Infektionen zu sein.
    Notes: Summary The biliary elimination of cefotaxime (CTX) and its metabolite desacetylcefotaxime (DSCTX) were measured by HPLC in nine recently cholecystectomised patients following the i. v. injection of 15 mg/kg body weight of CTX. All of the bile was collected by an original procedure: the inflated balloon of a Fogarty catheter was introduced into the distal branch of a Kehr drain T-tube. Biliary clearance of CTX and DSCTX was measured for 8 h. Cefotaxime peaked at 90 min after injection at 34.5 ± 15.3 mg/l; in the 7–8 h sample it was 2.7 ± 1.7 mg/l. DSCTX peaked at the same time at 49.3 ± 17.0 mg/l, and was 4.6 ± 3.2 mg/l at 8 h. The bile/serum ratio of CTX and DSCTX concentrations was above 1 from the first to the eighth hours (range: 1.35 ± 1.08 to 11.0 ± 3.1). The biliary clearance of CTX was 0.190 ml/min. The total amounts of CTX and DSCTX eliminated in bile were respectively 1050 ± 472.8 µg and 1902.7 ± 804.1 µg (0.093 ± 0.041% of the dose and 0.186 ± 0.077% of the dose). Considering the minimum inhibitory concentration of the pathogens currently encountered in biliary sepsis, CTX should be a suitable antimicrobial agent for the treatment of biliary infections.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Plasma chemistry and plasma processing 5 (1985), S. 333-351 
    ISSN: 1572-8986
    Keywords: Plasma etching ; SF6 discharge ; tungsten ; molybdenum ; mass spectrometry ; WF6 ; WOF4
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Technology
    Notes: Abstract The etching rates and reaction products of refractory metals (W, Mo, and Ta) and silicon have been studied in a SF6-O2 r.f. plasma at 0.2 torr. The relative concentrations of WF6 and WOF4 and the intensities of the WF n + (n=3−5), WOF m + (m=1−3), MoF n + , and MoF m + ions have been measured by mass spectroscopy. An analysis of the neutral composition of the plasma during etching of these metals and a comparison with the results obtained for silicon show that at least two species are involved for W and Mo etching: fluorine and oxygen atoms. A reaction scheme is proposed.
    Type of Medium: Electronic Resource
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