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  • American Association for the Advancement of Science (AAAS)  (456)
  • American Meteorological Society
  • Annual Reviews
  • PANGAEA
  • 1990-1994  (797)
  • 1935-1939
  • 1994  (797)
  • 1
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    Hubble space telescope observations of comet p/shoemaker-levy 9 (1993e) (1994)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1994-02-11
    Description: The Hubble Space Telescope observed the fragmented comet P/Shoemaker-Levy 9 (1993e) (P indicates that it is a periodic comet) on 1 July 1993. Approximately 20 individual nuclei and their comae were observed in images taken with the Planetary Camera. After subtraction of the comae light, the 11 brightest nuclei have magnitudes between approximately 23.7 and 24.8. Assuming that the geometric albedo is 0.04, these magnitudes imply that the nuclear diameters are in the range approximately 2.5 to 4.3 kilometers. If the density of each nucleus is 1 gram per cubic centimeter, the total energy deposited by the impact of these 11 nuclei into Jupiter's atmosphere next July will be approximately 4 x 10(30) ergs ( approximately 10(8) megatons of TNT). This latter number should be regarded as an upper limit because the nuclear magnitudes probably contain a small residual coma contribution. The Faint Object Spectrograph was used to search for fluorescence from OH, which is usually an excellent indicator of cometary activity. No OH emission was detected, and this can be translated into an upper limit on the water production rate of approximately 2 x 10(27) molecules per second.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Weaver, H A -- Feldman, P D -- A'hearn, M F -- Arpigny, C -- Brown, R A -- Helin, E F -- Levy, D H -- Marsden, B G -- Meech, K J -- Larson, S M -- Noll, K S -- Scotti, J V -- Sekanina, Z -- Shoemaker, C S -- Shoemaker, E M -- Smith, T E -- Storrs, A D -- Yeomans, D K -- Zellner, B -- New York, N.Y. -- Science. 1994 Feb 11;263(5148):787-91.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17770832" 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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  • 2
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    The clementine mission to the moon: scientific overview (1994)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1994-12-16
    Description: In the course of 71 days in lunar orbit, from 19 February to 3 May 1994, the Clementine spacecraft acquired just under two million digital images of the moon at visible and infrared wavelengths. These data are enabling the global mapping of the rock types of the lunar crust and the first detailed investigation of the geology of the lunar polar regions and the lunar far side. In addition, laser-ranging measurements provided the first view of the global topographic figure of the moon. The topography of many ancient impact basins has been measured, and a global map of the thickness of the lunar crust has been derived from the topography and gravity.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Nozette, S -- Rustan, P -- Pleasance, L P -- Kordas, J F -- Lewis, I T -- Park, H S -- Priest, R E -- Horan, D M -- Regeon, P -- Lichtenberg, C L -- Shoemaker, E M -- Eliason, E M -- McEwen, A S -- Robinson, M S -- Spudis, P D -- Acton, C H -- Buratti, B J -- Duxbury, T C -- Baker, D N -- Jakosky, B M -- Blamont, J E -- Corson, M P -- Resnick, J H -- Rollins, C J -- Davies, M E -- Lucey, P G -- Malaret, E -- Massie, M A -- Pieters, C M -- Reisse, R A -- Simpson, R A -- Smith, D E -- Sorenson, T C -- Breugge, R W -- Zuber, M T -- New York, N.Y. -- Science. 1994 Dec 16;266(5192):1835-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17737076" 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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    Superconductivity in SrCuO2-BaCuO2 Superlattices: Formation of Artificially Layered Superconducting Materials (1994)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1994-09-30
    Description: Pulsed-laser deposition was used to synthesize artificially layered high-temperature superconductors. Thin-film compounds were formed when the constraint of epitaxy was used to stabilize SrCuO(2)-BaCuO(2) superlattices in the infinite layer structure. Using this approach, two new structural families, Ba(2)Srn-1,Cun+1 O2n+2+delta and Ba(4)Srn-1 Cun+3O2n+6+delta have been synthesized; these families superconduct at temperatures as high as 70 kelvin.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Norton, D P -- Chakoumakos, B C -- Budai, J D -- Lowndes, D H -- Sales, B C -- Thompson, J R -- Christen, D K -- New York, N.Y. -- Science. 1994 Sep 30;265(5181):2074-7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17811410" 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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  • 4
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    (Table 1) Age model of ODP Hole 120-747A (1994)
    PANGAEA
    Details
    Publication Date: 2024-06-08
    Keywords: 120-747A; Age model; Age model, optional; Age model, paleomag, Berggren et al (1985); Age model, paleomag, Cande and Kent (1992); Ageprofile Datum Description; DEPTH, sediment/rock; DRILL; Drilling/drill rig; Joides Resolution; Leg120; Ocean Drilling Program; ODP; South Indian Ridge, South Indian Ocean
    Type: Dataset
    Format: text/tab-separated-values, 66 data points
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  • 5
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    (Table 2) Strontium 87/86 ratios of ODP Hole 120-747A (1994)
    PANGAEA
    Details
    Publication Date: 2024-06-08
    Keywords: 120-747A; Age model; Age model, optional; Age model, paleomag, Berggren et al (1985); Age model, paleomag, Cande and Kent (1992); DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Joides Resolution; Leg120; Ocean Drilling Program; ODP; Sample code/label; South Indian Ridge, South Indian Ocean; Strontium-87/Strontium-86 ratio; Strontium-87/Strontium-86 ratio, error
    Type: Dataset
    Format: text/tab-separated-values, 445 data points
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  • 6
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    Oligocene-Miocene strontium isotopes of ODP Hole 120-747A (1994)
    PANGAEA
    In:  Supplement to: Oslick, Jeffrey S; Miller, Kenneth G; Feigenson, Mark D; Wright, James D (1994): Oligocene-Miocene strontium isotopes: Stratigraphic revisions and correlations to an inferred glacioeustatic record. Paleoceanography, 9(3), 427-444, https://doi.org/10.1029/94PA00249
    Details
    Publication Date: 2024-06-08
    Description: This study tests and improves on previously published early and middle Miocene 87Sr/86Sr marine correlations, presents Sr isotopic age correlations for this interval using the new timescale of Cande and Kent [1992 doi:10.1029/92JB01202], and evaluates Sr isotopic changes against an inferred glacioeustatic proxy. We generated a latest Oligocene to early late Miocene 87Sr/86Sr isotope record from Ocean Drilling Program (ODP) Hole 747A; this site provides an excellent magnetostratigraphic record during most of this interval for independent age estimates, very good foraminiferal preservation, and excellent core recovery. Comparisons of new 87Sr/86Sr data from Hole 747A with previously published data from Deep Sea Drilling Project (DSDP) Sites 608 [Miller et al., 1991 doi:10.1029/90PA01941] and 588 [Hodell et al., 1991 doi:10.1130/0091-7613(1991)019〈0024:VITSIC〉2.3.CO;2] yield the following results: (1) confirmation and refinement of the early Miocene Sr isotope changes, (2) improved definition of the timing of the changes in slope of 87Sr/86Sr near 15.4 Ma and 22.8 Ma, (3) improved Sr isotopic age resolution for the middle Miocene with resolution as good as +/- 0.7 m.y., and (4) identification of an inflection in the Sr isotope record at 28.0 Ma based on the combined records from DSDP Site 522 [Miller et al., 1988 doi:10.1029/PA003i002p00223] and ODP Hole 747A. We have been unable to determine the cause of middle Miocene offset between Site 588 and Hole 747A data, although we believe it may be attributed to problems in the age assignments for Hole 588A for the interval ~14-11 Ma and Site 747 for the interval 11-8 Ma. Because Hole 747A results provide a better chronology than Site 588 for most of the Miocene and a better middle Miocene Sr isotope record than Site 608, we propose that Hole 747A serves as the best reference section for Miocene 87Sr/86Sr variations from ca. 23 to 11 Ma. Using 87Sr/86Sr data from Sites 522, 608, and 747A, we relate late Eocene to early Miocene inflections in the 87Sr/86Sr isotope record to oxygen isotope increases and decreases inferred to represent glacioeustatic events. The decreases (deglaciations) observed in the ?18O record apparently lead the 87Sr/86Sr inflections by 1 to 1.5 m.y.
    Keywords: 120-747A; DRILL; Drilling/drill rig; Joides Resolution; Leg120; Ocean Drilling Program; ODP; South Indian Ridge, South Indian Ocean
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 7
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    Engineering poliovirus as a vaccine vector for the expression of diverse antigens (1994)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1994-09-02
    Description: As a step toward developing poliovirus as a vaccine vector, poliovirus recombinants were constructed by fusing exogenous peptides (up to 400 amino acids) and an artificial cleavage site for viral protease 3Cpro to the amino terminus of the viral polyprotein. Viral replication proceeded normally. An extended polyprotein was produced in infected cells and proteolytically processed into the complete array of viral proteins plus the foreign peptide, which was excluded from mature virions. The recombinants retained exogenous sequences through successive rounds of replication in culture and in vivo. Infection of animals with recombinants elicited a humoral immune response to the foreign peptides.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Andino, R -- Silvera, D -- Suggett, S D -- Achacoso, P L -- Miller, C J -- Baltimore, D -- Feinberg, M B -- AI22346/AI/NIAID NIH HHS/ -- AI35545/AI/NIAID NIH HHS/ -- RR00169/RR/NCRR NIH HHS/ -- New York, N.Y. -- Science. 1994 Sep 2;265(5177):1448-51.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Microbiology and Immunology, University of California, San Francisco.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8073288" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Antibodies, Bacterial/biosynthesis ; Antibodies, Viral/biosynthesis ; Antigens, Bacterial/genetics/immunology ; Antigens, Viral/genetics/immunology ; Base Sequence ; Cloning, Molecular ; *Genetic Engineering ; Genetic Vectors ; HeLa Cells ; Humans ; Macaca fascicularis ; Mice ; Mice, Transgenic ; Molecular Sequence Data ; Poliovirus/*genetics/immunology/physiology ; Poliovirus Vaccine, Oral/*genetics ; *Protein Biosynthesis ; Proteins/metabolism ; Recombinant Proteins/biosynthesis/metabolism ; Vaccines, Synthetic/genetics/*immunology ; Virus Replication
    Print ISSN: 0036-8075
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  • 8
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    Glacial-interglacial changes in moisture sources for greenland: influences on the ice core record of climate (1994)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1994-01-28
    Description: Large, abrupt shifts in the (l8)O/(16)O ratio found in Greenland ice must reflect real features of the climate system variability. These isotopic shifts can be viewed as a result of air temperature fluctuations, but determination of the cause of the changes-the most crucial issue for future climate concerns-requires a detailed understanding of the controls on isotopes in precipitation. Results from general circulation model experiments suggest that the sources of Greenland precipitation varied with different climate states, allowing dynamic atmospheric mechanisms for influencing the ice core isotope shifts.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Charles, C D -- Rind, D -- Jouzel, J -- Koster, R D -- Fairbanks, R G -- New York, N.Y. -- Science. 1994 Jan 28;263(5146):508-11.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17754884" target="_blank"〉PubMed〈/a〉
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  • 9
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    Diurnal and Semidiurnal Variations in the Earth's Rotation Rate Induced by Oceanic Tides (1994)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1994-05-06
    Description: Recent space-geodetic observations have revealed daily and subdaily variations in the Earth's rotation rate. Although spectral analysis suggests that the variations are primarily of tidal origin, comparisons to previous theoretical predictions based on various ocean models have been less than satisfactory. This disagreement is partly caused by deficiencies in physical modeling. Rotation predictions based on a reliable tidal-height model, with corresponding tidal currents inferred from a modified form of Laplace's momentum equations, yield predictions of tidal variations in Universal Time that agree with very long baseline interferometer observations to 2 microseconds. This agreement resolves a major discrepancy between theory and observation and establishes the dominant role of oceanic tides for inducing variation in the Earth's rotation at these frequencies.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ray, R D -- Steinberg, D J -- Chao, B F -- Cartwright, D E -- New York, N.Y. -- Science. 1994 May 6;264(5160):830-2.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17794725" target="_blank"〉PubMed〈/a〉
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  • 10
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    The use of graft copolymers to bind immiscible blends (1994)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1994-08-19
    Description: Computer simulations and experimental studies were combined to design copolymers that enhance the strength of polymer composites. These copolymers contain side chains that associate across the boundary between phase-separated regions to form a "molecular velcro" that effectively binds the regions together. This behavior significantly improves the structural integrity and mechanical properties of the material. Because the side chains can be fabricated from a large class of compounds, the technique greatly increases the variety of copolymers that can be used in forming high-strength polymer blends.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Gersappe, D -- Irvine, D -- Balazs, A C -- Liu, Y -- Sokolov, J -- Rafailovich, M -- Schwarz, S -- Peiffer, D G -- New York, N.Y. -- Science. 1994 Aug 19;265(5175):1072-4.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17832898" target="_blank"〉PubMed〈/a〉
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