Bibliothek

X
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
  • 1
    Digitale Medien
    Digitale Medien
    Electron correlations in coupled quantum dots (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 1041-1046 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The quantum states of two electrons in a pair of coupled quantum dots confined by heterostructures of compound semiconductors were calculated. As the physical parameters were changed various quantum states of electrons were obtained. The correlation between electrons in these quantum states is analyzed using the mean distance between electrons and its variance. When the quantum states include quadruple degenerate ground states, electrons are localized on each quantum dot and all kinetic movement except spin is frozen. This suggests that a Mott insulator phase will appear in a bulk array of coupled quantum dots. Because coupled quantum dot arrays can be assembled to include both metallic regions and insulating regions without changing the density of electrons, they have great potential in applications for future electron devices.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.357821
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 2
    Digitale Medien
    Digitale Medien
    Magnetic and magneto-optic properties of thick face-centered-cubic Co single-crystal films (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 64 (1994), S. 2736-2738 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The present letter describes for the first time the magnetic and magneto-optical properties of thick fcc cobalt single-crystal films ((approximately-equal-to)1000-A(ring) thickness). The magneto-crystalline anisotropy constants K1 and K2 are about −7.2×10 erg/cc and 2×10 erg/cc at 77 K, respectively. Both decrease in magnitude with increasing temperature in a range from 77 K to about 450 K. The easy axis is found to be 〈111〉. The polar Kerr angle for the fcc phase is much larger than that of the hcp phase by 0.1°–0.2° in a photon energy range from about 1 to 5 eV.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.111946
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 3
    Digitale Medien
    Digitale Medien
    Oriented diamond on graphite flakes (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 65 (1994), S. 540-542 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Diamond was deposited by the microwave plasma chemical vapor deposition method on a Si(100) substrate on which graphite flakes had been spread with their basal planes parallel to the substrate before deposition. Before diamond deposition, the substrate was preheated at 1200 °C under hydrogen at 60 Torr to clean the surface of graphite flakes. Scanning electron micrographs showed that most of diamond particles were cubo-octahedral in morphology. The {111} planes of some diamond particles, which were judged by their triangular shape, were often parallel to the (0001) plane of graphite. Furthermore, some 〈111〉-oriented diamond particles were clearly nucleated at the edge of graphite. The possibility of heteroepitaxy of diamond on graphite was discussed based on crystallographic considerations.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.112291
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 4
    Digitale Medien
    Digitale Medien
    Growth of oriented diamond on single crystal of silicon carbide (0001) (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 64 (1994), S. 557-559 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Diamond was deposited on a (0001) plane of an α-silicon carbide single crystal by the microwave method. The substrate surface was cleaned by pretreatment with hydrogen gas at 1200 °C. Cubo-octahedral diamond crystals with (111)D(parallel)(0001)SiC were obtained.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.111102
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 5
    Digitale Medien
    Digitale Medien
    Inaccessible Pore Characterization of Less-Crystalline Microporous Solids (1994)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 98 (1994), S. 9594-9600 
    Details
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/j100089a038
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 6
    Digitale Medien
    Digitale Medien
    Identification and characterization of a chromosomal virulence gene, vacJ, required for intercellular spreading of Shigella flexneri (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Molecular microbiology 11 (1994), S. 0 
    Details
    ISSN: 1365-2958
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie , Medizin
    Notizen: Intercellular spreading of shigellae Is a prerequisite for shigellosis, although the molecular mechanisms underlying the phenomenon are still largely obscure. To elucidate some of these mechanisms, we performed random TniO insertion mutagenesis in Shigella flexneri YSH6000T and found a chromosomal locus in the Notl-J segment responsible for bacterial spreading. The locus affected in the mutant, designated vacJ, was neither involved in the invasion of epithelial cells nor in intracellular movement, but was required for intercellular spread. The vacJ mutant was capable of forming bacterium-containing membranous protrusions within the infected cell, but had diminished ability to move from the protrusions into the cytoplasm of the adjacent epithelial cells. Cloning and sequencing of the vacJ region Indicated that the vacJ gene encoded a 28.0 kDa protein possessing a signal peptide at the N-terminus, which contained the motif characteristic of lipoproteins. The analysis of the vacJ product indicated that VacJ was exposed on the bacterial surface. The vacJ gene was distributed among shigellae and enteroinvasive Escherichia coli, and the constructed vacJ mutants failed to spread intercellularly, indicating that vacJ is a chromosomal gene essential for the pathogenicity of shigeiiae.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2958.1994.tb00287.x
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 7
    Digitale Medien
    Digitale Medien
    Frequent expression of 75 kDa nerve growth factor receptor and phosphotyrosine in human peripheral nerve tumours: an immunohistochemical study on paraffin-embedded tissues (1994)
    Springer
    Virchows Archiv 424 (1994), S. 563-568 
    Details
    ISSN: 1432-2307
    Schlagwort(e): Nerve growth factor receptor Phosphotyrosine ; Peripheral nerve tumours Immunohistochemistry
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract One hundred and three benign, and 10 malignant peripheral nerve tumours were examined immunohistochemically for expression of 75 kDa nerve growth factor receptor (NGFR). In benign tumours NGFR was demonstrated at 61% in neurinoma, 71% in neurofibroma, 93% in neurofibromatosis and 90% in traumatic neuroma. Malignant neurogenic tumours were 100% positive for NGFR. Phosphotyrosine-immunoreactivity was detected in 76% of NGFR-positive tumours but the frequency of immunostained tumour cells was low. These results suggest that both benign and malignant peripheral nerve tumours express 75 kDa NGFR. The receptor seems to serve as growth signal transduction of the tumour cells in terms of phosphorylation of the tyrosine residue of the receptor or the target protein of the NGFR protein tyrosine kinase.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00191444
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 8
    Digitale Medien
    Digitale Medien
    Preferential localization of c-kit product in tissue mast cells, basal cells of skin, epithelial cells of breast, small cell lung carcinoma and seminoma/dysgerminoma in human: immunohistochemical study on formalin-fixed, paraffin-embedded tissues (1994)
    Springer
    Virchows Archiv 424 (1994), S. 135-141 
    Details
    ISSN: 1432-2307
    Schlagwort(e): C-kit product ; Immunohistochemistry ; Human normal tissue ; Small cell lung carcinoma ; Seminoma/dysgerminoma
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract Eighteen hundred and eighty-four cases of human solid tumours and 833 samples of normal human tissues, formalin-fixed and paraffin-embedded, were examined immunohistochemically for expression of c-kit oncogene product using polyclonal antibody against synthesized c-kit peptide. Seminoma/dysgerminoma and small cell lung carcinoma (SCLC) show preferential c-kit expression at 92% and 36% frequency, respectively, whereas only sporadic cases of cervical carcinoma and non-SCLC lung carcinoma show c-kit positivity. A normal tissue counterpart positive for c-kit product is detected in the testis (spermatocyte) and ovary (oocyte) but not in the lung or the cervix. In contrast, normal epithelial cells of the breast, skin basal cells and tissue mast cells harbour c-kit product, but transformed cells of the former two are largely deficient in the c-kit protein. One hundred and thirty-nine neuroendocrine tumours and 39 non-pulmonary small cell carcinomas were all negative, except for two cases of neuroblastoma. This indicates a distinct character for SCLC in c-kit expression. The c-kit product may be a useful marker in diagnostic pathology of seminoma/dysgermona and SCLC among human solid tumours, and in distinction of SCLC from non-pulmonary small cell carcinoma.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00193492
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 9
    Digitale Medien
    Digitale Medien
    A novel enzymatic dehalogenation of (R)-3-chloro-1,2-propanediolin Alcaligenes sp. DS-S-7G (1994)
    Springer
    Applied microbiology and biotechnology 42 (1994), S. 270-279 
    Details
    ISSN: 1432-0614
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00902728
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 10
    Digitale Medien
    Digitale Medien
    A novel enzymatic dehalogenation of (R)-3-chloro-1,2-propanediol inAlcaligenes sp. DS-S-7G (1994)
    Springer
    Applied microbiology and biotechnology 42 (1994), S. 270-279 
    Details
    ISSN: 1432-0614
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: Abstract The mechanism of the novel enzymatic dehalogenating action of (R)-3-chloro-1,2-propanediol [monochlorohydrin (MCH)] was investigated. The (R)-MCH-dechlorinating enzyme system ofAlcaligenes sp. DS-S-7G, which stereoselectively assimilated (R)-MCH from the racemate, was composed of two components (Enzyme 1 and Enzyme 2). Enzyme 1 was a flavoprotein with a relative molecular mass (M r) of 70,000 and was composed of two kinds of polypeptides (58,000 and 16,000). The enzyme exhibited activity for converting (R)-MCH to hydroxyacetone with the liberation of chloride ions under aerobic conditions. On the other hand, Enzyme 2 with anM r of 86,000, which was also composed of two kinds of polypeptides (33,000 and 53,000), showed no dechlorinating activity for (R)-MCH. However, in the presence of NAD+, when Enzyme 1 was conjugated with Enzyme 2 in the (R)-MCH-dechlorinating reaction, the co-operative dechlorinating activity was four to five times higher than that by Enzyme 1 alone. (R)-MCH was finally degraded to acetic acid and formic acid by the joint action of the two enzymes. These facts indicate that (R)-MCH is oxidatively dechlorinated by the two enzymes in the presence of NAD+ inAlcaligenes sp. DS-S-7G.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00902728
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
Schließen ⊗
Diese Webseite nutzt Cookies und das Analyse-Tool Matomo. Weitere Informationen finden Sie hier...