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  • 1
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Picosecond pump probe measurements on waveguides containing a single GaAs/GaAlAs quantum well have enabled us to determine for the first time both electron and hole escape times from biased quantum wells. Contributions from excitonic saturation and field screening by photogenerated carriers can be clearly identified in the nonlinear transition signal and are quantitatively modeled. Preliminary analysis suggests that thermally assisted escape is dominant at room temperature, but discrepancies are found with conventional thermionic emission models.
    Type of Medium: Electronic Resource
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  • 2
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    In:  J. Seism. Res., Amsterdam, 4, vol. 13, no. 4a, pp. 223-233, pp. B03405, (ISSN: 1340-4202)
    Publication Date: 1990
    Keywords: Source parameters ; Earthquake ; Fault plane solution, focal mechanism ; JSR
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  • 3
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    In:  J. Geophys. Res., Chengdu, Sichuan, China, 4, vol. 96, no. B3, pp. 10159-10176, pp. 1334, (ISSN: 1340-4202)
    Publication Date: 1991
    Keywords: Seismology ; Nuclear explosion ; Hypocentral depth ; Seismic networks ; JGR
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  • 4
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    Il Cigno Galileo Galilei
    In:  Professional Paper, Open-File Rept., Earthquake Prediction, Roma, Il Cigno Galileo Galilei, vol. 1, no. 2, pp. 317-332, (ISBN 0080419208)
    Publication Date: 1992
    Keywords: Earthquake precursor: prediction research ; Earthquake precursor: deformation or strain ; Earth tides ; Earthquake precursor: tilt ; JZSCHAU
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  • 5
    Publication Date: 1990-12-10
    Description: Familial cancer syndromes have helped to define the role of tumor suppressor genes in the development of cancer. The dominantly inherited Li-Fraumeni syndrome (LFS) is of particular interest because of the diversity of childhood and adult tumors that occur in affected individuals. The rarity and high mortality of LFS precluded formal linkage analysis. The alternative approach was to select the most plausible candidate gene. The tumor suppressor gene, p53, was studied because of previous indications that this gene is inactivated in the sporadic (nonfamilial) forms of most cancers that are associated with LFS. Germ line p53 mutations have been detected in all five LFS families analyzed. These mutations do not produce amounts of mutant p53 protein expected to exert a trans-dominant loss of function effect on wild-type p53 protein. The frequency of germ line p53 mutations can now be examined in additional families with LFS, and in other cancer patients and families with clinical features that might be attributed to the mutation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Malkin, D -- Li, F P -- Strong, L C -- Fraumeni, J F Jr -- Nelson, C E -- Kim, D H -- Kassel, J -- Gryka, M A -- Bischoff, F Z -- Tainsky, M A -- 34936/PHS HHS/ -- 5-T32-CA09299/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1990 Nov 30;250(4985):1233-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Division of Molecular Genetics, Massachusetts General Hospital Cancer Center, Charlestown 02129.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1978757" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Base Sequence ; Breast Neoplasms/*genetics ; Chromosomes, Human, Pair 17 ; Cloning, Molecular ; Codon ; DNA/genetics ; Deoxyribonucleases, Type II Site-Specific ; *Genes, p53 ; Genetic Testing ; Germ Cells ; Humans ; Molecular Sequence Data ; *Mutation ; Neoplastic Syndromes, Hereditary/*genetics ; Pedigree ; Polymerase Chain Reaction ; Polymorphism, Restriction Fragment Length ; Repetitive Sequences, Nucleic Acid ; Sarcoma/*genetics ; Tumor Suppressor Protein p53/genetics
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 6
    Publication Date: 1992-03-06
    Description: High-temperature creep experiments on polycrystalline perovskite (CaTiO(3)), an analog of (Mg,Fe)SiO(3) perovskite of the lower mantle, suggest that (grain size-sensitive) diffusion creep is important in the lower mantle and show that creep rate is enhanced by the transformation from the orthorhombic to the tetragonal structure. These observations suggest that grain-size reduction after a subducting slab passes through the 670-kilometer discontinuity or after a phase transformation from orthorhombic to tetragonal in perovskite will result in rheological softening in the top portions of the lower mantle.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Karato, S -- Li, P -- New York, N.Y. -- Science. 1992 Mar 6;255(5049):1238-40.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17816832" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 7
    Publication Date: 1991-12-20
    Description: Pancreatic islet cells are the targets of an autoimmune response in type I diabetes. In the nonobese diabetic (NOD) mouse model of autoimmune diabetes, expression of major histocompatibility complex (MHC) class I proteins was inversely correlated with diabetes; in this mouse a mutation in the MHC class II-linked gene for the putative MHC class I peptide transporter was also present. Mice deficient in MHC class I expression because they do not produce beta 2-microglobulin also developed late onset autoimmune diabetes. In cells from humans with type I diabetes expression of MHC class I was decreased; subsets of prediabetics categorized as most likely to become hyperglycemic also had low MHC class I. T cell responses to self antigens are faulty in diabetics. In sets of genetically identical twins that are discordant for diabetes, the defect appeared to reside with the antigen presenting cell. Thus, a lack of surface MHC class I protein is associated with autoimmune diabetes; the concomitant defect in antigen presentation may impair the development of self tolerance, which could result in autoimmune disease.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Faustman, D -- Li, X P -- Lin, H Y -- Fu, Y E -- Eisenbarth, G -- Avruch, J -- Guo, J -- New York, N.Y. -- Science. 1991 Dec 20;254(5039):1756-61.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Medicine, Harvard Medical School, Massachusetts General Hospital, Charlestown 02129.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1763324" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Autoimmune Diseases/*genetics ; Cytotoxicity, Immunologic ; Diabetes Mellitus, Type 1/genetics/*immunology ; Diseases in Twins ; Flow Cytometry ; Gene Expression ; *Genes, MHC Class I ; Humans ; *Lymphocyte Activation ; Lymphocytes/*immunology ; Mice ; Mice, Inbred BALB C ; Mice, Inbred C57BL ; Mice, Inbred NOD ; Prediabetic State/genetics/immunology ; Spleen/immunology ; T-Lymphocytes/immunology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 8
    ISSN: 1432-1181
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Description / Table of Contents: Zusammenfassung Es werden drei verschiedene Methoden herangezogen, um die Erfüllung der Ausflußbedingung bei der Berechnung des konvektiven Wärmeübergangs von einem zweidimensionalen Fluidstrahl an die Wände eines rechteckigen Hohlraumes zu erzwingen. Diese seien kurz bezeichnet als: (1) lokales Massenerhaltungsprinzip, (2) Einkomponentenprinzip, (3) Vollausbildung des Strömungsprofils. Unter Verwendung dieser drei Prinzipien ermittelte numerische Lösungen wurden mit experimentell (Naphtalin-Sublimationsmethode) gefundenen Ergebnissen verglichen. Es zeigte sich, daß Methode (3) ungeeignet ist, Methode (2) gute Ergebnisse für den Hohlraumboden liefert, aber an den Seitenwänden qualitativ von den Versuchsdaten abweicht und daß Methode (1) die beste Übereinstimmung bewirkt. Bei Problemen, welche starke Rezirkulationsströmungen am Austritt des zur Berechnung vorgegebenen Kontrollraumes erwarten lassen, sollte daher dieser Methode der Vorzug gegeben werden.
    Notes: Abstract Three practices of treating outflow boundary condition were adopted in computations for convective heat transfer of a two-dimensional jet impinging in a rectangular cavity. The three practices were local mass conservation method, local one-way method and fully developed assumption. The numerical solutions of the three methods were compared with test data obtained via, naphthalene sublimation technique. It was found that the fully developed assumption was inappropriate, and the local one-way method could provide reasonably good results for the cavity bottom, while for the lateral wall the results with this method qualitatively differed from the test data. The solution with the local mass conservation method was the best. It thus suggested that for a problem expected with a strong recirculating flow at the exit of the computation domain, the local mass conservation method be adopted to treat the outflow boundary condition.
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  • 9
    ISSN: 1432-5411
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A four-body quantum-mechanical system is studied and through suitable manipulations of its wave functions, dominant shapes and modes of internal motion are ascribed to a number of its low-lying 0+ states.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1432-0703
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Notes: Abstract Consumer food ingredients may enter the terrestrial environment as constituents of municipal sludge which is used as a beneficial fertilizer source in land application. Evaluation of the plant/soil response to specific organic constituents, in the presence and absence of municipal sludge, is thus an important scientific component. Olestra is a consumer ingredient used in savory snacks to eliminate fat content and reduce calories in these foods. The fat substitute olestra is a mixture of hexa, hepta, and octaesters of sucrose with medium and long-chain fatty acids. Experiments were conducted of plant response in olestra mixtures with soil or municipal sludge/soil over a range from 0–1,000 mg olestra/kg dry soil. The plants grown from seed were corn, fescue, wheat, and soybean, with the latter two continued to seed production maturity. The comparison of effects rationale used in this study requires some consistent response to be measured and removes emphasis from singular, statistically significant response. The investment in multiple measures of plant response, separate periods of time, and appropriate multiple controls are necessary to place emphasis on consistent trends for a comparison rationale. For olestra, the notion of consistent effects permits the conclusion that more highly saturated solid olestra did not impact plant growth at concentrations of 0–1,000 mg olestra/kg dry soil in soil alone or in sludge/soil mixtures. The absence of effects occurred with germination, height, and biomass parameters.
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