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  • 1990-1994  (3)
  • 1985-1989  (5)
  • 1960-1964  (1)
  • 1
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: In the photon energy range from 40 to 1000 eV, we have measured reflectances and transmittances of polyimide foils as well as reflectances and total photoelectron yields of Cu and Pt films. We compare sets of optical constants derived by the different methods applied to the same sample. The degree of agreement gives an indication of the present status of determining optical properties in the XUV. This is relevant for the planning of advanced instrumentation.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 569-573 
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We have developed and brought into operation a new type of scanning soft x-ray microscope basing on a grazing incidence mirror. A ring shaped ellipsoidal mirror serves as a nonimaging but concentrating optical element to produce a microfocus. The specimen is mechanically scanned, and the image is recorded a pixel at a time. Transmission, total photoelectron yield, photoelectron spectroscopy, fluorescence, and stimulated desorption of ions and neutrals can provide information in the range of photon energies between 20 and 1300 eV. While the smallest spatially resolved structure, limited by the mirror imperfections, has a size of 0.4 μm, the minimum diameter of selected areas necessary for photoelectron microspectroscopy presently is about 4 μm.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Naturwissenschaften 48 (1961), S. 711-712 
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1432-2242
    Keywords: Tomato ; Lycopersicon peruvianum ; Self-incompatibility ; S-locus mutation ; Pollination Style-ribonuclease (S-RNase)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A series of crosses between a naturally-occurring self-compatible accession ofLycopersicon peruvianum and a closely-related self-incompatible accession were used to demonstrate that the mutation to self-compatibility is located at the S-locus. Progeny of the crosses contain abundant style proteins of about 30 kDa that segregate with the S6and S7-alleles from the SI parent and the Sc-allele from the SC parent. The S6and S7-associated proteins have ribonuclease activity whereas the Sc-associated protein is not an active ribonuclease. This finding indicates that S-RNases are determinants of self-incompatibility in the style and that the ribonuclease activity is essential for their function.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Infection 16 (1988), S. 171-174 
    ISSN: 1439-0973
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Vor der geplanten Hepatitis-B-Impfung wurden 36 000 Angehörige von medizinischen Berufen auf HBs-Antigen, HBc-Antikörper und HBs-Antikörper getestet. Dabei wurde in 210 Sera HBs-Antigen und HBc-Antikörper nachgewiesen. 171 dieser Sera konnten auch mittels Hybridisierungstechnik auf virale Hepatitis B-DNS als Marker der Infektiosität untersucht werden. Nur bei 15 war virale Nukleinsäure nachweisbar. Bei 139 fanden sich HBe-Antikörper, von denen aber nur zwei HBV-DNS-positiv waren. Zwölf Personen, die alle HBV-DNS-negativ waren, hatten weder HBe-Antigen noch HBe-Antikörper. Hingegen wurde virale Nukleinsäure bei 13 von 20 Sera gefunden, die HBe-Antigen, aber keine HBe-Antikörper enthielten. Unsere Untersuchung bestätigt die epidemiologische Beobachtung, daß dem medizinischen Personal kaum eine Rolle als Infektionsquelle für die Patienten zukommt.
    Notes: Summary Prior to hepatitis B vaccination, 36,000 persons of the medical staff were tested for HBs antigen, HBc antibodies, and HBs antibodies. 210 sera were found positive for HBs antigen and HBc antibodies. Of these sera, 171 were available for testing for hepatitis B virus DNA as a marker of infectivity by spot hybridization. DNA was detected in only 15. One hundred and thirty-nine had HBe antibodies but no detectable HBe antigen, and only two of these were hepatitis B virus DNA positive. 12 had neither HBe antigen nor HBe antibodies and none had hepatitis B virus DNA. Hepatitis B virus DNA was, however, detected in 13 of 20 HBe antigen-positive but HBe antibody-negative sera. Our study confirms epidemiological observations that medical staff hardly plays any role as a source of HBV infection for patients.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract From XPS core level spectroscopy the average copper charge on the Cu sites in the high temperature superconductor Y1Ba2Cu3O7−x is determined as function of the oxygen vacancy concentrationx. Analysis of these data leads to the suggestion that there are holes on the oxygen sites in the basal plane of the crystal structure. The probability for holes on these oxygen ions is rather constant for 0≦x≦0.3 with a value of 0.64 and decreases to zero forx=0.5. The dependence of the superconducting transition temperature on the hole concentration is discussed. An energy level diagram for Cu2+ and Cu3+ in YBa2Cu3O7−x is constructed.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    European journal of nutrition 24 (1985), S. 44-53 
    ISSN: 1436-6215
    Keywords: Vitamin D ; Vitamin-D-Metaboliten ; Frauenmilch ; Kuhmilch ; Säuglingsnahrung
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Medicine
    Description / Table of Contents: Summary A review is given of the results of vitamin D determinations in human and cow's milk using physico-chemical methods. Thereby only parent vitamin D is determined. Further, the results obtained with protein-binding assays are discussed in detail. With the aid of these newer methods the concentrations of hydroxylated vitamin D derivatives can also be measured. A comparison of the concentration of these vitamin D metabolites in human milk and infant formulas based upon cow's milk suggests that the higher anti-rachitic activity of human milk is connected with its higher concentration of 25-hydroxy-vitamin D.
    Notes: Zusammenfassung Nach einer übersicht der Untersuchungen von Frauenmilch und Kuhmilch, die mit biologischen und physikalisch-chemischen Methoden durchgeführt worden sind und die nur das native Vitamin D erfassen, werden die Ergebnisse, die mit neueren Nachweisverfahren gewonnen wurden, ausführlich diskutiert. Die Anwendung von Proteinbindungsassays ermöglicht auch eine Bestimmung von hydroxylierten Vitamin-D-Metaboliten. Ein Vergleich der Konzentrationen von Frauenmilch und Säuglingsformulae auf Kuhmilchbasis deutet darauf hin, daß die günstigere antirachitische Aktivität von Frauenmilch vor allem auf den höheren Gehalt an 25-Hydroxy-Vitamin D zurückzuführen ist.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Infection 18 (1990), S. 286-288 
    ISSN: 1439-0973
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Es wurden 294 in medizinischen Berufen tätige Personen aus 21 verschiedenen Fachbereichen auf Hepatitis C Virus (HCV) Antikörper mittels ELISA-Testset der Firma Ortho untersucht, und nur sechs (2%) positiv gefunden. Personen mit direktem Patientenkontakt wie Ärzte und Schwestern scheinen dabei ein höheres Infektionsrisiko zu haben, als Personen ohne direkten Kontakt wie medizinisch-technische Assistentinnen oder das Reinigungspersonal. Auf der geriatrischen Abteilung ist das Risiko vielleicht etwas höher als auf den anderen Stationen, aber generell ist das Hepatitis-C-Infektionsrisiko für das Personal im medizinischen Bereich als eher gering einzustufen.
    Notes: Summary 294 health care workers from 21 different departments were tested for hepatitis C antibodies by means of the Ortho ELISA test. Only six (2%) were found positive. Health care workers having direct contact with the patient, such as doctors and nurses, seem to be at a higher risk of infection than those with only indirect contact, such as laboratory technicians and cleaning personnel. In the geriatric ward the risk is possibly slightly higher than in other departments. However, in general risk of infection with HCV for health care workers seems to be low.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Type of Medium: Electronic Resource
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