Bibliothek

feed icon rss

Ihre E-Mail wurde erfolgreich gesendet. Bitte prüfen Sie Ihren Maileingang.

Leider ist ein Fehler beim E-Mail-Versand aufgetreten. Bitte versuchen Sie es erneut.

Vorgang fortführen?

Exportieren
Filter
Materialart
Erscheinungszeitraum
Schlagwörter
  • 1
    Digitale Medien
    Digitale Medien
    Springer
    Applied physics 55 (1992), S. 97-100 
    ISSN: 1432-0630
    Schlagwort(e): 72.40.+w ; 42.81.Et ; 78.20.Ci
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract The photoconductivity and photovoltaic currents of pure LiNbO3 and proton exchanged waveguides in LiNbO3 have been measured as a function of the optical intensity up to about several kW/cm2 by the use of surface electrodes. For pure LiNbO3 the observed dependences are a simple extrapolation of the well known low intensity behaviour. The photoconductivity of proton exchanged waveguides is considerably increased compared with pure LiNbO3 and the curves are strongly nonlinear in the high intensity region. These results can explain, at least qualitatively, the previously observed characteristic time and intensity dependence of light-induced refractive index changes in this type of waveguides. Both the time and temperature behaviour of the dark conductivity of all proton exchanged waveguides give strong evidence of ionic charge transport in the proton exchanged region.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 2
    Digitale Medien
    Digitale Medien
    Springer
    Archives of microbiology 67 (1969), S. 189-198 
    ISSN: 1432-072X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary Candida albicans exhibits greater susceptibility to inactivation by ultraviolet (uv) radiation if grown before or after irradiation at 37° C rather than 25° C. Caffeine, acriflavin or amino acid analogues potentiate inactivation during postirradiation growth at 37° C but have little effect at 25° C. In contrast to inactivation, mutation induction by uv is unaffected by pre- or postirradiation growth temperatures or by metabolic antagonists. These findings are not explicable in terms of possible effects of growth temperatures on known mechanisms for repair of uv damaged DNA. They are consistent, however, with a previous proposal that a temperature dependent mechanism for dark recovery exists in C. albicans which involves synthesis of protein essential for repair of lethal, non-genetic uv damage.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 3
    ISSN: 1432-1858
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Technik allgemein
    Notizen: Abstract Micro- and integrated-optical devices in glass and polymers are integrated increasingly in microsystems. Design and simulation of such optical elements are well developed. Ray tracing and a manifold of propagation and field calculation methods are available. First steps to CAD have been done. Using Ag+−Na+ ion exchange in special optical glasses, one-and two-dimensional refractive index profiles of definite shape have been realezed. Good quality one-dimensional profiles can be used for micro-cylindrical lens fabrication (N.A.≥0.5), two dimensional index gradients have been used for phase grating fabrication. E-beam direct writing with variable shaped beam has been used successfully to realize different types of surface corrugated microoptical components. Embossing in polymers is a well suitable method for fabrication of passive integrated-optical devices and of micro-optical elements as refractive and diffractive lenses and lens arrays, corrugated prisms and gratings. Applications of glass and polymer microoptical devices have been demonstrated for laser diode collimation, in miniaturized interferometers, beam deflectors and modulators.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 4
    ISSN: 1439-0973
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Zusammenfassung Das Auftreten vonStaphylococcus aureus wurde bei 157 Mukoviszidosepatienten über 30 Monate hin analysiert. Dazu wurden dieS. aureus-Isolate nach Lysotyp, Plasmidmuster sowie in einigen Fällen dem Restriktionsmuster ihrer chromosomalen DNS klassifiziert. Danach konnte in 44% aller Patienten, in deren SputaS. aureus nachweisbar war, bei aufeinanderfolgenden Episoden ein Wechsel desS. aureus-Typs beobachtet werden. IdentischeS. aureus-Typen wurden bei 68% der Patienten gefunden, wobei derselbe Typ in bis zu fünf verschiedenen Patienten auftrat. Bei sechs Patienten persistierte derselbeS. aureus-Stamm (bis zu zehn Monate), bei drei unter ihnen war er zwischendurch nicht mehr nachweisbar. Die Ergebnisse weisen auf die Möglichkeit der Ausbreitung vonS. aureus-Stämmen unter Mukoviszidosepatienten hin.
    Notizen: Summary An epidemiological analysis ofStaphylococcus aureus was conducted in a study group of 157 cystic fibrosis patients cultured over a 30-month period. The resultingS. aureus isolates were categorized by bacteriophage type, plasmid profile, and (in some instances) chromosomal restriction fragment pattern of the culture-positive patients withS. aureus (34 of 157) 44% only were sporadically infected while 68% shared identical strains with one or more other patients. Six patients exhibited persistent infection (for up to ten months) which, in three individuals, occurred as cycles of carriage and reappearance. By contributing toward our understanding of the persistence and spread ofS. aureus in cystic fibrosis patients these data should aid in clarifying the role this organism may play in the course of the disease.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 5
    Digitale Medien
    Digitale Medien
    Springer
    European journal of clinical microbiology & infectious diseases 16 (1997), S. 170-173 
    ISSN: 1435-4373
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract Methicillin-resistantStaphylococcus aureus (MRSA) strains isolated over a one-year period from a Greek hospital were tested for their levels of resistance to methicillin by population analysis. Heterogeneously resistant strains belonged to classes I, II, and II/III, whereas homogeneously resistant ones belonged to class IV. Strains of all classes possessed the mecA gene. Pulsed-field gel electrophoresis (PFGE) of Smal-digested genomic DNA revealed that all heterogeneously resistant strains were related. Homogeneously resistant strains were also closely related, but in a cluster distinct from the heterogeneous one. The methicillin-sensitive strains displayed a greater variety of PFGE types compared to MRSA isolates.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 6
    Digitale Medien
    Digitale Medien
    Springer
    European journal of clinical microbiology & infectious diseases 14 (1995), S. 923-925 
    ISSN: 1435-4373
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
Schließen ⊗
Diese Webseite nutzt Cookies und das Analyse-Tool Matomo. Weitere Informationen finden Sie hier...