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  • Electronic Resource  (5)
  • 2000-2004  (1)
  • 1985-1989  (4)
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  • Electronic Resource  (5)
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  • 1
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 73 (2002), S. 1934-1938 
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We briefly describe a heterodyne refractometer developed at the BIPM in collaboration with the BNM/INM conservatory. The heart of the refractometer, a double Fabry–Perot interferometer, is placed inside the balance case of a very sensitive 1 kg mass comparator, the FB2 balance. Comparisons between methods using refractometry and the NPL revised Edlén formulas, carried out for a period of nine months, yielded a difference in air index of refraction of 4×10−8 with a standard deviation of 1×10−8. The variation of air index of refraction was about 1.5×10−5 during the study. Precise determinations of the short-term and long-term stability of the Fabry–Perot cavity, made of Zerodur, were also achieved. For monitoring air density, results obtained with the refractometry method were compared with those deduced from two other methods: the CIPM formula for the density of moist air and the use of buoyancy artifacts. The response characteristics for the three determinations were comparable and the agreement among the air density determinations was within 1×10−5 kg m−3. © 2002 American Institute of Physics.
    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: 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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  • 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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  • 5
    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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