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  • 1990-1994  (19)
  • 1970-1974  (7)
  • 1
    Electronic Resource
    Electronic Resource
    Guanylhydrazones with potential antileukemic activity. 1. Aza analogs of 4,4'-diacetyldiphenylurea bis(guanylhydrazone) (1973)
    s.l. : American Chemical Society
    Journal of medicinal chemistry 16 (1973), S. 959-961 
    Details
    ISSN: 1520-4804
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jm00266a025
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  • 2
    Electronic Resource
    Electronic Resource
    Some analyses of potential profiles of forward-biased high-low junctions (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 2496-2501 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A model calculation for the variation of the normalized potential against the normalized position for a forward-biased, below 2 thermal voltage, high-low junction has been made through numerical computations of Poisson's equation. The model is oriented to a junction with a sufficiently large doping difference between the two sides.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.357022
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  • 3
    Electronic Resource
    Electronic Resource
    Intra-operative blood loss during elective lower segment caesarean section (1992)
    Oxford, UK : Blackwell Publishing Ltd
    BJOG 99 (1992), S. 0 
    Details
    ISSN: 1471-0528
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Objective To measure intra-operative blood loss at elective lower segment caesarean section and to compare estimated wtih measured blood loss.Design Prospective observational study. Blood loss was measured in patients who underwent lower segment caesarean section in the course of routine hospital activity.Setting Tsan Yuk Hospital (Hong Kong), which is affiliated to the University of Hong Kong, 1990–1991.Subjects Forty women (mean age 29 years) with singleton pregnancies (mean gestation 38 weeks) delivered by elective lower segment caesarean section under general anaesthesia (mean birthweight 3177 g).Main outcome measure Intra-operative blood loss measured by the alkaline haematin method (intra-assay co-efficient of Variation 2.2%).Results The mean measured blood loss was 487 ml (SE 40, range 164–1438). The mean estimated blood loss was 425 ml (SE 31) range 100–1300; mode 400). Observer error in estimating blood loss was higher if measured blood loss 〉600 ml. One patient received a blood transfusion and another had a post-operative haemoglobin level 〈10.0g/dl.Conclusion Blood loss at elective lower segment caesarean section was usually 〈500 ml and was estimated with reasonable accuracy. However, there was a tendency to under-estimate blood loss when the measured loss exceeded 600 ml.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1471-0528.1992.tb13749.x
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  • 4
    Electronic Resource
    Electronic Resource
    Temperature dependence of Auger lifetime in heavily doped Hg1−xCdxTe (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 6642-6644 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An expression for Auger lifetime as a function of temperature has been derived for a heavily doped Hg1−xCdxTe in the presence of a nonparabolicity of band structure, band gap narrowing, and carrier degeneracy. It is utilized to study the variation of Auger lifetime with temperature through numerical analysis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355106
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  • 5
    Electronic Resource
    Electronic Resource
    Transport mechanism in semiconducting glassy silicon vanadates (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 3961-3965 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Measurements are reported for the electrical conductivity of the semiconducting glassy silicon vanadates in the temperature range 80–400 K. The experimental results have been analyzed with reference to the existing theoretical models of hopping conduction. The analysis shows that at high temperatures the conductivity data are consistent with Mott's model [J. Non-Cryst. Solids 1, 1 (1968)] of phonon-assisted polaronic hopping, while Mott's variable range hopping model [Philos. Mag. 19, 835 (1969)] is valid at low temperatures. The small polaron model of Schnakenberg [Phys. Status Solidi 28, 623 (1968)] is also found to be consistent with the temperature dependence of the conductivity. The temperature dependence of the conductivity can also be interpreted in the framework of the percolation model proposed by Triberis and Friedman [J. Phys. C 18, 2281 (1985)]. The analysis of the conductivity data also indicates that the hopping in these vanadate glasses occurs in the nonadiabatic regime.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.354464
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  • 6
    Electronic Resource
    Electronic Resource
    Semiconducting properties of sol-gel derived vanadium silicate glasses (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 59 (1991), S. 855-856 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Preparation of semiconducting vanadium silicate glasses by the sol-gel route and the results of electrical measurements are reported for the first time. The temperature dependence of the electrical conductivity has been analyzed in terms of small polaron as well as percolation models.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.105258
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  • 7
    Electronic Resource
    Electronic Resource
    METABOLISM OF ISOLATED RAT BRAIN PERFUSED WITH GLUCOSE OR MANNOSE AS SUBSTRATE (1972)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of neurochemistry 19 (1972), S. 0 
    Details
    ISSN: 1471-4159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract— After isolated rat brain preparations were perfused with fluid containing either mannose or glucose as metabolic substrate, extracts from the rapidly frozen cerebral cortex were prepared and analysed. Brains perfused with mannose contained somewhat lower levels of glucose-6-phosphate and fructose diphosphate than those perfused with glucose but the contents of other glycolytic intermediates were quite similar in both groups. The level of mannose-6-phosphate was high in brains perfused with either glucose or mannose, but higher in the latter. In both cases, the ratio of mannose-6-phosphate to fructose-6-phosphate was very high, suggesting that phosphomannose isomerase (EC 5.3.1.8) may be important in the regulation of glycolysis. The levels of adenine nucleotides and creatine phosphate and the redox ratios were not significantly different with mannose as substrate than with glucose. The contents of free amino acids in brains perfused with mannose did not differ significantly from those in brains perfused with glucose. Our results show that mannose is a satisfactory substrate for the brain under these experimental conditions since it maintains the energy reserves and oxidative status of the cerebral tissue and does not alter the levels of amino acids.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1471-4159.1972.tb01453.x
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  • 8
    Electronic Resource
    Electronic Resource
    Trace element geochemistry and genesis of the copper ore deposits of the Singhbhum shear zone, Eastern India (1972)
    Springer
    Mineralium deposita 7 (1972), S. 292-313 
    Details
    ISSN: 1432-1866
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Description / Table of Contents: Zusammenfassung Als Beitrag zur Klärung der Genese der Kupferlagerstätten in der Singhbhum Shear Zone, Indien, wurden geochemische Untersuchungen an Erzen und Nebengestein durchgeführt. Spurengehalte von Cu, Co, Ni, Pb, Zn, Cd, Ag, Mn, Hg wurden mit Hilfe der AAS bestimmt, ihre Verteilung innerhalb der Zone und der angrenzenden Gesteinstypen wird diskutiert. Auf Grund der vorliegenden geochemischen Daten wird folgende Deutung zur Entstehung der Erzlagerstätten gegeben: Die Bildung der Singhbhum-Erzvorkommen ist das Ergebnis einer Folge langandauernder und sich überschneidender geologischer Prozesse, wie intensiver Scherung, syntektonischer Granitisation und damit verbundener Mobilisierung der oben genannten Elemente. Die präkambrischen Metasedimente und Metavulkanite innerhalb der Scherzone und ihrer näheren Umgebung sind als „Muttergesteine“ der erzbildenden Elemente anzusehen. Die Bildung der Lagerstätte ist das Resultat der Diffusion von Lösungen und ihres Absatzes in physikalisch-chemisch günstigen „Struktur-Fallen“, gebildet im Anschluß an die Scherung.
    Notes: Abstract The genesis of the copper ore deposits of the Singhbhum shear zone, India, has been worked out through a detailed geochemical examination of the ores and the country rocks. Following different techniques of atomic absorption, the abundances of Cu, Co, Ni, Pb, Zn, Cd, Ag, Mn and Hg were determined and the trace element characteristics of the principal rock units in and outside the shear zone have been compiled and critically evaluated. The data suggest that the ore deposits are the result of a sequence of long-continued and over-lapping geological processes culminating in intense shearing, syntectonic granitization and considerable mobilization of the ore elements. The Precambrian metasedimentary and metavolcanic rocks of the shear zone, as well as those enclosing it, served as the source, while diffusion of the ore constituents and their precipitation in physicochemically favourable structural traps, formed in response to shearing, resulted in the formation of the deposits.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00206791
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  • 9
    Electronic Resource
    Electronic Resource
    Image segmentation using a neural network (1991)
    Springer
    Biological cybernetics 66 (1991), S. 151-158 
    Details
    ISSN: 1432-0770
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Computer Science , Physics
    Notes: Abstract An object extraction problem based on the Gibbs Random Field model is discussed. The Maximum a'posteriori probability (MAP) estimate of a scene based on a noise-corrupted realization is found to be computationally exponential in nature. A neural network, which is a modified version of that of Hopfield, is suggested for solving the problem. A single neuron is assigned to every pixel. Each neuron is supposed to be connected only to all of its nearest neighbours. The energy function of the network is designed in such a way that its minimum value corresponds to the MAP estimate of the scene. The dynamics of the network are described. A possible hardware realization of a neuron is also suggested. The technique is implemented on a set of noisy images and found to be highly robust and immune to noise.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00243290
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  • 10
    Electronic Resource
    Electronic Resource
    Enzymes of non-agglutinable vibrios and their possible role in the development of enterotoxic factor (1973)
    Springer
    Cellular and molecular life sciences 29 (1973), S. 903-904 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Résumé Sachant que le facteur entérotoxique peut être développé dans les vibrions non-agglutinables par transfer animal, nous avons déterminé les activités enzymatiques (mucinase, protéase, lécithinase) de ces vibrions. Après ce transfert l'activité lécithinasique a augmenté, et cette activité est semblable à celle d'un virus (V. cholerae). Nous supposons que l'augmentation du facteur entérotoxique est causée par celle de l'activité de la lécithinase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01946359
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