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  • American Association for the Advancement of Science (AAAS)
  • 1990-1994  (16)
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  • 1
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    "Life" in an abstract world (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-08-24
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Russell, A M -- New York, N.Y. -- Science. 1990 Aug 24;249(4971):843-4.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17773080" 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
    Published by American Association for the Advancement of Science (AAAS)
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  • 2
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    Ozone control and methanol fuel use (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-01-12
    Description: Methanol fuel use in motor vehicles and stationary combustion has the potential to improve air quality. A modeling study of methanol fuel use in Los Angeles, California, shows that the low chemical reactivity of methanol vapor slows ozone formation and would lead to lower ozone concentrations. Predicted peak ozone levels decreased up to 16 percent, and exposure to levels above the federal standard dropped by up to 22 percent, when pure (M100) methanol fuel use was simulated for the year 2000. Similar results were obtained for 2010. Use of a gasoline-methanol blend (M85) resulted in smaller reductions. Predicted formaldehyde levels and exposure were not increased severely, and in some cases declined, in the simulations of methanol use.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Russell, A G -- St Pierre, D -- Milford, J B -- New York, N.Y. -- Science. 1990 Jan 12;247(4939):201-5.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17813288" target="_blank"〉PubMed〈/a〉
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 3
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    Matrix-Mediated Synthesis of Nanocrystalline ggr-Fe2O3: A New Optically Transparent Magnetic Material (1992)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1992-07-10
    Description: A new magnetic material with appreciable optical transmission in the visible region at room temperature has been isolated as a gamma-Fe(2)O(3)/polymer nanocomposite. The synthesis is carried out in an ion-exchange resin at 60 degrees C. Magnetization and susceptibility data demonstrate loading-dependent saturation moments as high as 46 electromagnetic units per gram and superparamagnetism for lower loadings where particle sizes are less than 100 angstroms. Optical absorption studies show that the small-particle form of gamma-Fe(2)O(3) is considerably more transparent to visible light than the single-crystal form. The difference in absorption ranges from nearly an order of magnitude in the "red" spectral region to a factor of 3 at 5400 angstroms. The magnetization of the nanocomposite is greater by more than an order of magnitude than those of the strongest room-temperature transparent magnets, FeBO(3) and FeF(3).〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ziolo, R F -- Giannelis, E P -- Weinstein, B A -- O'horo, M P -- Ganguly, B N -- Mehrotra, V -- Russell, M W -- Huffman, D R -- New York, N.Y. -- Science. 1992 Jul 10;257(5067):219-23.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17794752" target="_blank"〉PubMed〈/a〉
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  • 4
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    The Dinosaurs of' 47 (1991)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1991-02-15
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Russell, D A -- New York, N.Y. -- Science. 1991 Feb 15;251(4995):814.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17775461" 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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  • 5
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    Magnetic field studies of the solar wind interaction with venus from the galileo flyby (1991)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1991-09-27
    Description: During the 10 February 1990 flyby of Venus, the Galileo spacecraft skimmed the downstream flank of the planetary bow shock. This provided an opportunity to examine both the global and the local structure of the shock in an interval during which conditions in the solar wind plasma were quite steady. The data show that the cross section of the shock in planes transverse to the flow is smaller in directions aligned with the projection of the interplanetary magnetic field than in directions not so aligned. Ultralow-frequency waves were present in the unshocked solar wind, and their amplitude peaked when the spacecraft was downstream of the foreshock. At large distances down the tail, the Mach number of the flow normal to the shock is low, thus providing the opportunity to study repeated crossings of the collisionless shock in an interesting parameter regime. Some of the shock crossings reveal structure that comes close to the theoretically predicted form of intermediate shocks, whose existence in collisionless plasmas has not been confirmed.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kivelson, M G -- Kennel, C F -- McPherron, R L -- Russell, C T -- Southwood, D J -- Walker, R J -- Hammond, C M -- Khurana, K K -- Strangeway, R J -- Coleman, P J -- New York, N.Y. -- Science. 1991 Sep 27;253(5027):1518-22.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17784092" target="_blank"〉PubMed〈/a〉
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  • 6
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    Evidence for multiple sources of diamond from primitive chondrites (1991)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1991-11-22
    Description: Fine-grained diamonds, the most abundant form of circumstellar dust isolated from primitive meteorites, have elemental and isotopic characteristics that are dependent on the host meteorite type. Carbon isotopic compositions vary from -32 to -38 per mil, and nitrogen associated with the diamond changes in overall abundance by over a factor of four from 0.2 to 0.9 weight percent, between ordinary and CM2-type chondrites. Although the ratio of carbon to nitrogen evolves in a distinctive way during combustion of diamond separates, metamorphic degassing of nitrogen is not the main cause of the differences in nitrogen content. The data suggest that intrinsic differences must have been inherited by the diamonds at the time of their formation and that the diamonds were distributed heterogeneously in the solar nebula during condensation. However, the hypothesis that a distinct nitrogen carrier remains hidden within the diamond cannot be ruled out.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Russell, S S -- Arden, J W -- Pillinger, C T -- New York, N.Y. -- Science. 1991 Nov 22;254(5035):1188-91.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17776409" 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
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    Terrestrial carbon and nitrogen isotopic ratios from cretaceous-tertiary boundary nanodiamonds (1992)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1992-12-04
    Description: One hypothesis for the origin of the nanometer-size diamonds found at the Cretaceous-Tertiary (K-T) boundary is that they are relict interstellar diamond grains carried by a postulated asteroid. The (13)C/(12)C and (15)N/(14)N ratios of the diamonds from two sites in North America, however, show that the diamonds are two component mixtures differing in carbon and nitrogen isotopic composition and nitrogen abundance. Samples from a site from Italy show no evidence for either diamond component. All the isotopic signatures obtained from the K-T boundary are material well distinguished from known meteoritic diamonds, particularly the fine-grain interstellar diamonds that are abundant in primitive chondrites. The K-T diamonds were most likely produced during the impact of the asteroid with Earth or in a plasma resulting from the associated fireball.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Gilmour, I -- Russell, S S -- Arden, J W -- Lee, M R -- Franchi, I A -- Pillinger, C T -- New York, N.Y. -- Science. 1992 Dec 4;258(5088):1624-6.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17742530" target="_blank"〉PubMed〈/a〉
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  • 8
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    Heterogeneous reaction probabilities, solubilities, and the physical state of cold volcanic aerosols (1993)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1993-08-27
    Description: On 19 January 1992, heterogeneous loss of HNO(3), ClNO(3), and HCl was observed in part of the Mount Pinatubo volcanic cloud that had cooled as a result of forced ascent. Portions of the volcanic cloud froze near 191 kelvin. The reaction probability of ClNO(3) and the solubility of HNO(3) were close to laboratory measurements on liquid sulfuric acid. The magnitude of the observed loss of HCl suggests that it underwent a heterogeneous reaction. Such reactions could lead to substantial loss of HCl on background sulfuric acid particles and so be important for polar ozone loss.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Toon, O -- Browell, E -- Gary, B -- Lait, L -- Livingston, J -- Newman, P -- Pueschel, R -- Russell, P -- Schoeberl, M -- Toon, G -- Traub, W -- Valero, F P -- Selkirk, H -- Jordan, J -- New York, N.Y. -- Science. 1993 Aug 27;261(5125):1136-40.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17790346" target="_blank"〉PubMed〈/a〉
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  • 9
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    Interleukin-2 receptor gamma chain: a functional component of the interleukin-4 receptor (1993)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1993-12-17
    Description: The interleukin-2 (IL-2) receptor gamma chain (IL-2R gamma) is an essential component of high- and intermediate-affinity IL-2 receptors. IL-2R gamma was demonstrated to be a component of the IL-4 receptor on the basis of chemical cross-linking data, the ability of IL-2R gamma to augment IL-4 binding affinity, and the requirement for IL-2R gamma in IL-4-mediated phosphorylation of insulin receptor substrate-1. The observation that IL-2R gamma is a functional component of the IL-4 receptor, together with the finding that IL-2R gamma associates with the IL-7 receptor, begins to elucidate why deficiency of this common gamma chain (gamma c) has a profound effect on lymphoid function and development, as seen in X-linked severe combined immunodeficiency.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Russell, S M -- Keegan, A D -- Harada, N -- Nakamura, Y -- Noguchi, M -- Leland, P -- Friedmann, M C -- Miyajima, A -- Puri, R K -- Paul, W E -- New York, N.Y. -- Science. 1993 Dec 17;262(5141):1880-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Section on Pulmonary and Molecular Immunology, National Heart, Lung, and Blood Institute, NIH, Bethesda, MD 20892.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8266078" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Base Sequence ; Cell Line ; Cell Line, Transformed ; Genetic Linkage ; Humans ; Insulin Receptor Substrate Proteins ; Interleukin-4/metabolism ; L Cells (Cell Line) ; Mice ; Molecular Sequence Data ; Phosphoproteins/metabolism ; Phosphorylation ; Receptors, Interleukin-2/chemistry/genetics/*metabolism ; Receptors, Interleukin-4 ; Receptors, Mitogen/chemistry/genetics/*metabolism ; Severe Combined Immunodeficiency/genetics/immunology ; Signal Transduction ; Transfection ; X Chromosome
    Print ISSN: 0036-8075
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  • 10
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    Interleukin-2 receptor gamma chain: a functional component of the interleukin-7 receptor (1993)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1993-12-17
    Description: The interleukin-2 receptor gamma chain (IL-2R gamma) is a necessary component of functional IL-2 receptors. IL-2R gamma mutations result in X-linked severe combined immunodeficiency (XSCID) in humans, a disease characterized by the presence of few or no T cells. In contrast, SCID patients with IL-2 deficiency and IL-2-deficient mice have normal numbers of T cells, suggesting that IL-2R gamma is part of more than one cytokine receptor. By using chemical cross-linking, IL-2R gamma was shown to be physically associated with the IL-7 receptor. The presence of IL-2R gamma augmented both IL-7 binding affinity and the efficiency of internalization of IL-7. These findings may help explain the defects of XSCID. Given its role in more than one cytokine receptor system, the common gamma chain (gamma c) is proposed as the designation for IL-2R gamma.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Noguchi, M -- Nakamura, Y -- Russell, S M -- Ziegler, S F -- Tsang, M -- Cao, X -- Leonard, W J -- New York, N.Y. -- Science. 1993 Dec 17;262(5141):1877-80.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Section on Pulmonary and Molecular Immunology, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD 20892.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8266077" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; B-Lymphocytes/immunology ; Cell Line ; Genetic Linkage ; Interleukin-7/*metabolism ; L Cells (Cell Line) ; Mice ; Receptors, Interleukin/chemistry/genetics/*metabolism ; Receptors, Interleukin-2/chemistry/genetics/*metabolism ; Receptors, Interleukin-7 ; Severe Combined Immunodeficiency/genetics/immunology ; T-Lymphocytes/immunology ; Transfection ; X Chromosome
    Print ISSN: 0036-8075
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