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  • 1995-1999  (10)
  • 1985-1989  (4)
  • 1955-1959
  • 1996  (10)
  • 1986  (4)
  • 1
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 59 (1986), S. 2507-2510 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Gold-n-type GaAs Schottky contacts have been fabricated on a single-crystal part of polycrystalline GaAs with grain size of about 1 cm. The current-voltage (I-V) characteristic has been measured over the temperature range 120–380 K. The barrier height is evaluated from the Richardson plot as 0.57 eV, and discussed by taking account of the effects of an interfacial layer between the metal and semiconductor. The capacitance-voltage (C-V) characteristic has been measured at 0.1, 1, and 100 kHz over the temperature range 120–500 K. A frequency dispersion is observed in the C-V characteristic. It is explained by the frequency dispersion in the dielectric constant of the interfacial layer and the capacitive response of trapping states in the interfacial layer and single-crystal parts of polycrystalline GaAs.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have developed a very controllable fabrication process of an extremely narrow (∼10 nm) quantum wire metal-oxide-semiconductor field-effect transistor (MOSFET) on a separation-by-implanted-oxygen (SIMOX) substrate using anisotropic etching and selective oxidation technique. The drain current versus gate voltage characteristics show oscillations caused by Coulomb blockade even at room temperature. The oscillations split into several sharp peaks when the temperature is decreased, indicating that the channel is separated by several serial coupled quantum dots and that the quantum levels of these dots correspond to the observed fine peaks. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 382 (1996), S. 119-119 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR - The existence of extraocular pho-toreceptors is widespread within the animal kingdom1. In arthropods such receptors exist in various parts of the body2'7, but their function is unknown in any species. Here we demonstrate that the light sense of genitalia in butterflies, which is mediated by ...
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 204-206 (Mar. 1996), p. 647-656 
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 233-234 (Oct. 1996), p. 287-294 
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 8 (Jan. 1986), p. 125-132 
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 207-209 (Feb. 1996), p. 233-236 
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Immunogenetics 23 (1986), S. 181-186 
    ISSN: 1432-1211
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Employing isoeletric focusing combined with enzyme-linked immunoelectrotransfer blot analysis, the fourth component of complement (C4) was analyzed in the two highly histocompatible, major histocompatibility complex homozygous groups (J and K) of Xenopus laevis. Each group had a characteristic C4 isoelectric focusing pattern, i. e., an isoelectric point range of 8.0–8.5 for J (C4 j C4 j ) and 7.6–8.1 for K (C4 k C4 k ). In (J x K)F1 frogs, C4 proteins were expressed in a codominant fashion (C4 j C4 k ). In the backcrossed progeny B1 [J × (J × K)F1], those with C4 j C4 j rejected (J × K)F1 skins hyperacutely (〈 17 days), were high responders against (J × K)F1 cells, and nonstimulators to J cells in mixed lymphocyte reaction (MLR), but they did not suffer from the graft-versus-host reaction (GVHR), even after the injection of (J x K)F1 cell-stimulated J splenocytes. On the other hand, the B1 frogs with C4 j C4 k acutely or chronically (〉 17 days) rejected (J × K)F1 skins, were low or nonresponders against (J × K)F1 cells and high stimulators to J cells in MLR, and they suffered from GVHR after the injection of prestimulated J splenocytes. These results argue for the notion that the genes equivalent to mammalian class III map to the MHC at the phylogenetic level of the anuran amphibian.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Infection 14 (1986), S. S226 
    ISSN: 1439-0973
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Ofloxacin war in seiner antibakteriellen Aktivität gegen Enterobacteriaceae,Pseudomonas aeruginosa, Haemophilus influenzae, Branhamella catarrhalis undNeisseria gonorrhoeae mit Norfloxacin und Enoxacin vergleichbar und weit wirksamer als Pipemidsäure und Nalidixinsäure. Die Aktivität von Ofloxacin war zwei- bis achtfach geringer als die von Ciprofloxacin. GegenStaphylococcus aureus, Staphylococcus epidermidis, Streptococcus pneumoniae, Acinetobacter spp.,Legionella spp. undBacteroides fragilis besaß Ofloxacin größere Wirksamkeit als Norfloxacin, Enoxacin, Pipemidsäure und Nalidixinsäure und war mit Ciprofloxacin vergleichbar. Die Wirksamkeit von Ofloxacin bei systemischen Infektionen in Mäusen, verursacht durchS. aureus, Escherichia coli, Serratia marcescens undP. aeruginosa, war zwei- bis siebenmal stärker als die von Norfloxacin. Ofloxacin besaß starke Hemmwirkung gegen das durch die (ausE. coli Kl-16 rein gewonnene) DNA-Gyrase vermittelte Supercoiling der DNA. Zwischen antibakterieller Aktivität von Ofloxacin und seiner Hemmwirkung gegen DNA-Gyrasen Ofloxacinempfindlicher und Ofloxacin-resistenter klinischer Isolate vonE. coli besteht eine parallele Beziehung. Daraus kann man schließen, daß sich die hohe bakterizide Wirksamkeit von Ofloxacin und verwandten neuen Chinolonen durch ihre starke Hemmwirkung gegen DNA-Gyrasen in Bakterienzellen erklären läßt.
    Notes: Summary The antibacterial activity of ofloxacin against Enterobacteriaceae,Pseudomonas aeruginosa, Haemophilus influenzae, Branhamella catarrhalis, andNeisseria gonorrhoeae was comparable to norfloxacin and enoxacin, and far exceeded the activity of pipemidic acid and nalidixic acid. The activity of ofloxacin was two to eight times less than that of ciprofloxacin. Ofloxacin was more active againstStaphylococcus aureus, Staphylococcus epidermidis, Streptococcus pneumoniae, Acinetobacter spp.,Legionella spp., andBacteroides fragilis, than norfloxacin, enoxacin, pipemidic acid and nalidixic acid, and the activity of ofloxacin was comparable to that of ciprofloxacin. Ofloxacin was two to seven times more effective than norfloxacin in systemic infections in mice withS. aureus, Escherichia coli, Serratia marcescens andP. aeruginosa. Ofloxacin strongly inhibited DNA supercoiling activity of DNA gyrase purified fromE. coli KL-16. There is a parallel relationship between antibacterial activity of ofloxacin and its inhibitory action against DNA gyrases from ofloxacin-susceptible and ofloxacin-resistant clinical isolates ofE. coli. These results indicate that the high bactericidal action of ofloxacin and the related new quinolone agents can be explained by their potent inhibitory activities against DNA gyrase in bacterial cells.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1432-2048
    Keywords: Callus ; Cell wall ; Daucus (cell walls) ; Morphogenesis ; Neutral sugar ; Pectin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Carrot (Daucus carota L.) embryogenic callus (EC) loses its embryogenic competence and becomes nonembryogenic callus (NC) during long-term culture. With the loss of embryogenic competence, the cell clusters become smaller and the extent of intercellular attachments is reduced. Pectic fractions prepared from EC and NC were separated into two subfractions by gel filtration. A difference in sugar composition between EC and NC was found only in the high-molecular-mass (ca. 1300 kDa) subfraction, and the ratio of the amount of arabinose to that of galactose (Ara/Gal) was strongly and positively correlated with the size of cell clusters in several different cultures. From the results of sugar-composition and methylation analyses, and the results of treatment with exo-arabinanase, models of the neutral sugar chains of pectins from EC and NC are proposed. Both neutral sugar chains are composed of three regions. The basal region is composed of linearly linked arabinan 5-Araf〉 moieties in both types of callus. The middle galactan region is composed of 6-linked galactose, some of which branches at the 3 and 4 positions, and this region is larger and more frequently branched in NC than in EC. Finally, the terminal arabinan region is composed of 5-linked arabinose, branched at the 3 position, and the size of the terminal arabinan is larger in EC than in NC. The significance of the neutral sugar chains of pectins in the interaction of cell wall components and intercellular attachment is discussed.
    Type of Medium: Electronic Resource
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