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  • Articles  (51)
  • American Association for the Advancement of Science (AAAS)  (51)
  • 1995-1999  (51)
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  • 1940-1944
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  • Articles  (51)
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  • 1
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    AIDS vaccine development (1998)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1998-05-23
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Agosto, M -- Allan, J -- Benson, C -- Berger, E A -- Blumenthal, R -- Burton, D -- Clements, J -- Coffin, J -- Connor, R -- Cullen, B -- Desrosiers, R -- Dimitrov, D -- Doms, R -- Emerman, M -- Feinberg, M -- Fultz, P -- Gerard, C -- Gonsalves, G -- Haase, A -- Haigwood, N -- Hirsch, V -- Ho, D -- Hoxie, J A -- Hu, S L -- Zingale, D -- New York, N.Y. -- Science. 1998 May 8;280(5365):803, 804-5.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9599148" target="_blank"〉PubMed〈/a〉
    Keywords: *AIDS Vaccines/immunology ; Acquired Immunodeficiency Syndrome/prevention & control ; *Clinical Trials as Topic ; HIV Envelope Protein gp120/immunology ; HIV-1/immunology ; Humans ; National Institutes of Health (U.S.) ; United States
    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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    Plant diversity and productivity experiments in european grasslands (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-11-05
    Description: At eight European field sites, the impact of loss of plant diversity on primary productivity was simulated by synthesizing grassland communities with different numbers of plant species. Results differed in detail at each location, but there was an overall log-linear reduction of average aboveground biomass with loss of species. For a given number of species, communities with fewer functional groups were less productive. These diversity effects occurred along with differences associated with species composition and geographic location. Niche complementarity and positive species interactions appear to play a role in generating diversity-productivity relationships within sites in addition to sampling from the species pool.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hector -- Schmid -- Beierkuhnlein -- Caldeira -- Diemer -- Dimitrakopoulos -- Finn -- Freitas -- Giller -- Good -- Harris -- Hogberg -- Huss-Danell -- Joshi -- Jumpponen -- Korner -- Leadley -- Loreau -- Minns -- Mulder -- O'Donovan -- Otway -- Pereira -- Prinz -- Read -- et -- New York, N.Y. -- Science. 1999 Nov 5;286(5442):1123-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Natural Environmental Research Council (NERC) Centre for Population Biology, Imperial College at Silwood Park, Ascot, Berkshire, UK, GB-SL5 7PY. Institut fur Umweltwissenschaften, Universitat Zurich, Winterthurerstrasse 190, Zurich, Switzerland.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10550043" 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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    Photometry and spectroscopy of the GRB 970508 optical counterpart (1998)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1998-02-27
    Description: An optical transient within the error box of the gamma ray burst GRB 970508 was imaged 4 hours after the event. It displayed a strong ultraviolet excess, and reached maximum brightness 2 days later. The optical spectra did not show any emission lines, and no variations on time scales of minutes were observed for 1 hour during the decline phase. According to the fireball and afterglow models, the intensity should rise monotonically before the observed optical maximum, but the data indicate that another physical mechanism may be responsible for the constant phase seen during the first hours after the burst.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Castro-Tirado -- Gorosabel -- Benitez -- Wolf -- Fockenbrock -- Martinez-Gonzalez -- Kristen -- Broeils -- Pedersen -- Greiner -- Costa -- Feroci -- Piro -- Frontera -- Nicastro -- Palazzi -- Bartolini -- Guarnieri -- Masetti -- Piccioni -- Mignoli -- Wold -- Lacy -- Birkle -- Broadhurst -- et -- New York, N.Y. -- Science. 1998 Feb 13;279(5353):1011-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉A. J. Castro-Tirado and J. Gorosabel, Laboratorio de Astrofisica Espacial y Fisica Fundamental, INTA, Madrid, Spain. N. Benitez and E. Martinez-Gonzalez, Instituto de Fisica de Cantabria, Santander, Spain. C. Wolf, R. Fockenbrock, K. Birkle, Ma.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9461429" 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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    Science over politics (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-04-17
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lanza, R P -- Arrow, K J -- Axelrod, J -- Baltimore, D -- Benacerraf, B -- Bloch, K E -- Bloembergen, N -- Brown, H C -- Brown, M S -- Cibelli, J B -- Cohen, S -- Cooper, L N -- Corey, E J -- Dulbecco, R -- Fischer, E H -- Fitch, V L -- Friedmen, M -- Friedman, M -- Furchgott, R F -- Gell-Mann, M -- Glaser, D A -- Glashow, S L -- Gilbert, W -- Goldstein, J L -- Wilson, R W -- New York, N.Y. -- Science. 1999 Mar 19;283(5409):1849-50.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10206888" target="_blank"〉PubMed〈/a〉
    Keywords: *Bioethics ; Biomedical Research ; *Embryo Research ; Embryo, Mammalian/*cytology ; Federal Government ; Government Regulation ; Humans ; Politics ; Research/*legislation & jurisprudence ; Research Support as Topic/legislation & jurisprudence ; *Risk Assessment ; *Stem Cells ; United States ; United States Dept. of Health and Human Services
    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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    Genome maps 10. Comparative genomics. Mammalian radiations. Wall chart (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-11-30
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉O'Brien, S J -- Eisenberg, J F -- Miyamoto, M -- Hedges, S B -- Kumar, S -- Wilson, D E -- Menotti-Raymond, M -- Murphy, W J -- Nash, W G -- Lyons, L A -- Menninger, J C -- Stanyon, R -- Wienberg, J -- Copeland, N G -- Jenkins, N A -- Gellin, J -- Yerle, M -- Andersson, L -- Womack, J -- Broad, T -- Postlethwait, J -- Serov, O -- Bailey, E -- James, M R -- Marshall Graves, J A -- New York, N.Y. -- Science. 1999 Oct 15;286(5439):463-78.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉National Cancer Institute, Frederick, MD, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10577209" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Base Sequence ; *Chromosome Mapping ; Chromosome Painting ; *Genome ; *Genome, Human ; Humans ; Mammals/*genetics ; Nucleic Acid Hybridization ; Phylogeny
    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
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    Imaging of asteroid 433 eros during NEAR's flyby reconnaissance (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-07-27
    Description: During the 23 December 1998 flyby of asteroid 433 Eros, the Near-Earth Asteroid Rendezvous (NEAR) spacecraft obtained 222 images of Eros, as well as supporting spectral observations. The images cover slightly more than two-thirds of Eros (best resolution is approximately 400 meters per pixel) and reveal an elongated, cratered body with a linear feature extending for at least 20 kilometers. Our observations show that Eros has dimensions of 33 x 13 x 13 kilometers. The volume, combined with the mass determined by the NEAR radio science experiment, leads to a density of 2.5 +/- 0.8 grams per cubic centimeter. This relatively high density, and the presence of an extensive linear feature, suggest that Eros may be a structurally coherent body.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Veverka -- Thomas -- Bell 3rd -- Bell -- Carcich -- Clark -- Harch -- Joseph -- Martin -- Robinson -- Murchie -- Izenberg -- Hawkins -- Warren -- Farquhar -- Cheng -- Dunham -- Chapman -- Merline -- McFadden -- Wellnitz -- Malin -- Owen Jr -- Miller -- Williams -- et -- New York, N.Y. -- Science. 1999 Jul 23;285(5427):562-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Space Sciences Building, Cornell University, Ithaca, NY 14853, USA. Department of Geological Sciences, Northwestern University, 309 Locy Hall, Evanston, IL 60208, USA. Applied Physics Laboratory, 11100 Johns Hopkins Road, Laurel, MD 20723, USA. Sou.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10417381" target="_blank"〉PubMed〈/a〉
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  • 7
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    Decay of the GRB 990123 optical afterglow: implications for the fireball model (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-03-26
    Description: Broad-band (ultraviolet to near-infrared) observations of the intense gamma ray burst GRB 990123 started approximately 8.5 hours after the event and continued until 18 February 1999. When combined with other data, in particular from the Robotic Telescope and Transient Source Experiment (ROTSE) and the Hubble Space Telescope (HST), evidence emerges for a smoothly declining light curve, suggesting some color dependence that could be related to a cooling break passing the ultraviolet-optical band at about 1 day after the high-energy event. The steeper decline rate seen after 1.5 to 2 days may be evidence for a collimated jet pointing toward the observer.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Castro-Tirado -- Zapatero-Osorio -- Caon -- Cairos -- Hjorth -- Pedersen -- Andersen -- Gorosabel -- Bartolini -- Guarnieri -- Piccioni -- Frontera -- Masetti -- Palazzi -- Pian -- Greiner -- Hudec -- Sagar -- Pandey -- Mohan V -- Yadav -- Nilakshi -- Bjornsson -- Jakobsson -- Burud I -- et -- New York, N.Y. -- Science. 1999 Mar 26;283(5410):2069-73.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Instituto de Astrofisica de Andalucia, IAA-CSIC, Granada, Spain. Instituto de Astrofisica de Canarias, La Laguna, Tenerife, Spain. Astronomical Observatory, University of Copenhagen, Copenhagen, Denmark. Nordic Optical Telescope, La Palma, T.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10092226" target="_blank"〉PubMed〈/a〉
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  • 8
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    Results from the Mars Pathfinder camera (1997)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1997
    Description: Images of the martian surface returned by the Imager for Mars Pathfinder (IMP) show a complex surface of ridges and troughs covered by rocks that have been transported and modified by fluvial, aeolian, and impact processes. Analysis of the spectral signatures in the scene (at 440- to 1000-nanometer wavelength) reveal three types of rock and four classes of soil. Upward-looking IMP images of the predawn sky show thin, bluish clouds that probably represent water ice forming on local atmospheric haze (opacity approximately 0.5). Haze particles are about 1 micrometer in radius and the water vapor column abundance is about 10 precipitable micrometers.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Smith, P H -- Bell, J F 3rd -- Bridges, N T -- Britt, D T -- Gaddis, L -- Greeley, R -- Keller, H U -- Herkenhoff, K E -- Jaumann, R -- Johnson, J R -- Kirk, R L -- Lemmon, M -- Maki, J N -- Malin, M C -- Murchie, S L -- Oberst, J -- Parker, T J -- Reid, R J -- Sablotny, R -- Soderblom, L A -- Stoker, C -- Sullivan, R -- Thomas, N -- Tomasko, M G -- Wegryn, E -- New York, N.Y. -- Science. 1997 Dec 5;278(5344):1758-65.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ 85721, USA. psmith@lpl.arizona.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9388170" target="_blank"〉PubMed〈/a〉
    Keywords: Atmosphere ; *Extraterrestrial Environment ; Ice ; *Mars ; Minerals ; *Water ; Wind
    Print ISSN: 0036-8075
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  • 9
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    Overview and initial results of the very long baseline interferometry space observatory programme (1998)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1998-09-22
    Description: High angular resolution images of extragalactic radio sources are being made with the Highly Advanced Laboratory for Communications and Astronomy (HALCA) satellite and ground-based radio telescopes as part of the Very Long Baseline Interferometry (VLBI) Space Observatory Programme (VSOP). VSOP observations at 1.6 and 5 gigahertz of the milli-arc-second-scale structure of radio quasars enable the quasar core size and the corresponding brightness temperature to be determined, and they enable the motions of jet components that are close to the core to be studied. Here, VSOP images of the gamma-ray source 1156+295, the quasar 1548+056, the ultraluminous quasar 0014+813, and the superluminal quasar 0212+735 are presented and discussed.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hirabayashi -- Hirosawa -- Kobayashi -- Murata -- Edwards -- Fomalont -- Fujisawa -- Ichikawa -- Kii -- Lovell -- Moellenbrock -- Okayasu -- Inoue -- Kawaguchi -- Kameno -- Shibata -- Asaki -- Bushimata -- Enome -- Horiuchi -- Miyaji -- Umemoto -- Migenes V -- Wajima -- Nakajima -- et -- New York, N.Y. -- Science. 1998 Sep 18;281(5384):1825-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉H. Hirabayashi, H. Hirosawa, H. Kobayashi, Y. Murata, P. G. Edwards, E. B. Fomalont, K. Fujisawa, T. Ichikawa, T. Kii, J. E. J. Lovell, G. A. Moellenbrock, and R. Okayasu are with the Institute of Space and Astronautical Science, Sagamihara, Kanagawa 22.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9743489" target="_blank"〉PubMed〈/a〉
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  • 10
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    The structure of the upper atmosphere of mars: In situ accelerometer measurements from mars global surveyor (1998)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1998-03-25
    Description: The Mars Global Surveyor (MGS) z-axis accelerometer has obtained over 200 vertical structures of thermospheric density, temperature, and pressure, ranging from 110 to 170 kilometers, compared to only three previous such vertical structures. In November 1997, a regional dust storm in the Southern Hemisphere triggered an unexpectedly large thermospheric response at mid-northern latitudes, increasing the altitude of thermospheric pressure surfaces there by as much as 8 kilometers and indicating a strong global thermospheric response to a regional dust storm. Throughout the MGS mission, thermospheric density bulges have been detected on opposite sides of the planet near 90 degreesE and 90 degreesW, in the vicinity of maximum terrain heights. This wave 2 pattern may be caused by topographically-forced planetary waves propagating up from the lower atmosphere.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Keating -- Bougher -- Zurek -- Tolson -- Cancro -- Noll -- Parker -- Schellenberg -- Shane -- Wilkerson -- Murphy -- Hollingsworth -- Haberle -- Joshi -- Pearl -- Conrath -- Smith -- Clancy -- Blanchard -- Wilmoth -- Rault -- Martin -- Lyons -- Esposito -- Johnston -- et -- New York, N.Y. -- Science. 1998 Mar 13;279(5357):1672-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉G. M. Keating, R. H. Tolson, G. J. Cancro, S. N. Noll, J. S. Parker, T. J. Schellenberg, R. W. Shane, B. L. Wilkerson, The George Washington University at NASA Langley, MS 269, Hampton, VA 23681, USA. S. W. Bougher and J. M. Babicke, Universi.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9497278" target="_blank"〉PubMed〈/a〉
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