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  • 1
    Electronic Resource
    Electronic Resource
    Silicon doping of MBE-grown GaAs films (1983)
    Springer
    Applied physics 32 (1983), S. 195-200 
    Details
    ISSN: 1432-0630
    Keywords: 73.60
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Two concentration ranges of silicon doping in MBE-grown GaAs films have been investigated in some detail. In lightly doped films, with a free-electron concentration of ≈1016cm−3, low-temperature photoluminescence spectra have been analysed to develop a model to account for spectral features previously attributed to Ge and Si acceptor levels. In heavily doped films, a maximum free-electron concentration of ≈7×1018 cm−3 has been obtained, which is only rather weakly dependent on growth conditions and the nature of the arsenic species (As2 or As4). Transmission electron microscopy has shown that no significant precipitation effects occur when higher Si fluxes are used but there is evidence for autocompensation. The maximum PL intensity (300 K) is found at a lower free electron concentration then with Sn-doped films, and is more sharply peaked, but there is no evidence for an anomalous Moss-Burstein shift.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00820260
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  • 2
    Electronic Resource
    Electronic Resource
    Kinetic limitations to surface segregation during MBE growth of III–V compounds: Sn in GaAs (1984)
    Springer
    Applied physics 33 (1984), S. 87-92 
    Details
    ISSN: 1432-0630
    Keywords: 73.60
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The incorporation of Sn as a dopant in GaAs has been studied in the temperature range of 500°–650° C, over a wide range of Ga and As fluxes, the latter being incident as either As4 or As2 molecules. The results are explained in terms of a surface segregation model in which the behaviour at high growth temperatures (above ∼600 °C) approaches thermal equilibrium, but growth at lower temperatures involves a kinetic limitation to the segregation process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00617613
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  • 3
    Electronic Resource
    Electronic Resource
    Nucleation effects during MBE growth of Sn-Doped GaAs (1982)
    Springer
    Applied physics 28 (1982), S. 63-71 
    Details
    ISSN: 1432-0630
    Keywords: 73.60
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The morphology, structure and composition of Sn films on GaAs substrates have been investigated in relation to the predeposition technique used with Sn doping of MBE-grown GaAs films. It has been shown that 3-D aggregates of Sn are formed and a similar morphology has been identified in the Sn which accumulates at the surface of all Sn-doped GaAs films. The way in which this relates to donor incorporation is considered and a simple model of incorporation kinetics proposed which is shown to be consistent with observation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00617784
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  • 4
    Electronic Resource
    Electronic Resource
    Structure and histochemistry of the maxillary glands in the milkweed bug, Oncopeltus Fasciatus (Hem.)A revision of a thesis submitted to the faculty of Cornell University in partial fulfillment of the requirements for the degree of Master of Science. (1956)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 99 (1956), S. 575-611 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1050990307
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  • 5
    Electronic Resource
    Electronic Resource
    Chinese hamster cells exhibiting a temperature dependent alteration in purine transport (1974)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Cellular Physiology 83 (1974), S. 43-51 
    Details
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: This paper reports the isolation of a phenotypically stable line of Chinese hamster ovary cells which exhibits a temperature dependent alteration in the transport of some purines. The alteration manifests itself for the uptake of guanine, hypoxanthine, azaguanine and guanosine but not for adenine, adenosine or thymidine. Studies with crude cell extracts suggest that, at the temperature the alteration is being expressed, the HGPRT activity is within the normal range. In cell-cell hybridization studies the alteration behaves as a recessive genetic trait.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcp.1040830107
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  • 6
    Electronic Resource
    Electronic Resource
    Sulfhydryl groups during the s phase: Comparison of cells from G1, plateau-phase G1, and G0 (1973)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Cellular Physiology 81 (1973), S. 91-95 
    Details
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The non-protein sulfhydryl (NPSH) content of cells moving into S from G1, plateau phase G1, and G0 was measured. Chinese hamster ovary (CHO) cells accumulated in G1 by growth into plateau phase contain only one-fourth the NPSH concentration of cycling C1 cells or G1 cells accumulated by brief growth in isoleucine-deficient medium. Upon dilution of plateau cultures with fresh medium, cellular NPSH content increases rapidly, reaching the same level as that in cycling cells within four hours. This increase is prevented by cycloheximide but not by actinomycin D or hydroxyurea. Neither CHO cells cycling in vitro nor salivary gland G0 cells stimulated with isoproterenol in vivo show significant changes in intracellular NPSH concentrations during S phase. This suggests that the concentration of intracellular NPSH (glutathione) remains constant during the cell cycle except when cells are grown to plateau phase in exhausted or deficient medium, in which case normal degradation exceeds synthesis and the gross level falls until fresh medium is provided and synthesis, apparently on preexisting RNA templates, accelerates.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcp.1040810111
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  • 7
    Electronic Resource
    Electronic Resource
    Dynamic heterogeneity and metastasis (1984)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Cellular Physiology 121 (1984), S. 99-103 
    Details
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Parallel clonal populations grown to small defined sizes were used to quantitate rates of generation of metastatic cells. In murine KHT fibrosarcoma and B16 melanoma lines, metastatic cells are generated at effective rates of 10-5 per cell per generation, or greater. These variant cells are unstable, and are apparently lost at very high rates. It thus appears that metastases could arise from unstable variants, and that rapid rates of change in some phenotypes may be an important feature of malignant progression. We have called such rapid variations dynamic heterogeneity. This may be a useful concept for further investigating aspects of tumor heterogeneity.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcp.1041210412
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  • 8
    Electronic Resource
    Electronic Resource
    Studies on the fresh water fairy shrimp Chirocephalopsis bundyi (Forbes).A revision of a thesis submitted to the faculty of Cornell University in partial fulfillment for the Ph.D. degree. I. Structure and histochemistry of the ovary and accessory reproductive tissues (1959)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 104 (1959), S. 1-59 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051040102
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  • 9
    Electronic Resource
    Electronic Resource
    Studies on the fresh water fairy shrimp Chirocephalopsis bundyi (Forbes)A revision of a thesis submitted to the faculty of Cornell University in partial fulfillment for the Ph.D. degree.. II. Histochemistry of egg-shell formation (1960)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 107 (1960), S. 259-283 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051070303
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  • 10
    Electronic Resource
    Electronic Resource
    Negative staining-carbon film technique: New cellular and molecular applications (1991)
    New York, NY : Wiley-Blackwell
    Journal of Electron Microscopy Technique 18 (1991), S. 269-276 
    Details
    ISSN: 0741-0581
    Keywords: Negative staining ; Carbon film ; Mica ; Membrane ; Protein molecules ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Natural Sciences in General
    Notes: Two techniques are presented which extend the original negative staining-carbon film technique into new areas of cellular and molecular application. These relate (1) to the production of negatively stained specimens of single-layer plasma membrane split from intact cells during the overall procedure that are negatively stained from the cytoplasmic face and (2) to the production of negatively stained specimens directly from glycerol-containing protein solutions, membrane or viral suspensions. In both cases in vacuo drying onto mica from glycerol is performed, prior to deposition of a carbon film. (For the cellular technique, freshly cleaved mica is firstly rendered positively charged by immersion in Alcian blue.) This is followed by release of the carbon film plus adsorbed membrane or protein by floating onto water, with subsequent negative staining. Selected preliminary applications using human erythrocyte membrane and the high molecular weight (native) human erythrocyte tripeptidyl peptidase-II complex are given and considered speculation as to the future application of the techniques is provided.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jemt.1060180309
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