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  • Articles  (299)
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  • 2000-2004  (299)
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  • 1
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    Temperatures, winds, and composition in the saturnian system (2004)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2004-12-25
    Description: Stratospheric temperatures on Saturn imply a strong decay of the equatorial winds with altitude. If the decrease in winds reported from recent Hubble Space Telescope images is not a temporal change, then the features tracked must have been at least 130 kilometers higher than in earlier studies. Saturn's south polar stratosphere is warmer than predicted from simple radiative models. The C/H ratio on Saturn is seven times solar, twice Jupiter's. Saturn's ring temperatures have radial variations down to the smallest scale resolved (100 kilometers). Diurnal surface temperature variations on Phoebe suggest a more porous regolith than on the jovian satellites.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Flasar, F M -- Achterberg, R K -- Conrath, B J -- Pearl, J C -- Bjoraker, G L -- Jennings, D E -- Romani, P N -- Simon-Miller, A A -- Kunde, V G -- Nixon, C A -- Bezard, B -- Orton, G S -- Spilker, L J -- Spencer, J R -- Irwin, P G J -- Teanby, N A -- Owen, T C -- Brasunas, J -- Segura, M E -- Carlson, R C -- Mamoutkine, A -- Gierasch, P J -- Schinder, P J -- Showalter, M R -- Ferrari, C -- Barucci, A -- Courtin, R -- Coustenis, A -- Fouchet, T -- Gautier, D -- Lellouch, E -- Marten, A -- Prange, R -- Strobel, D F -- Calcutt, S B -- Read, P L -- Taylor, F W -- Bowles, N -- Samuelson, R E -- Abbas, M M -- Raulin, F -- Ade, P -- Edgington, S -- Pilorz, S -- Wallis, B -- Wishnow, E H -- New York, N.Y. -- Science. 2005 Feb 25;307(5713):1247-51. Epub 2004 Dec 23.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉National Aeronautics and Space Administration (NASA)/Goddard Space Flight Center, Code 693, Greenbelt, MD 20771, USA. f.m.flasar@nasa.gov〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15618486" target="_blank"〉PubMed〈/a〉
    Keywords: Atmosphere ; Carbon ; Extraterrestrial Environment ; Hydrogen ; Methane ; *Saturn ; Spacecraft ; Spectrum Analysis ; Temperature ; Wind
    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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    Detection of a deep 3-microm absorption feature in the spectrum of Amalthea (JV) (2004)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2004-12-25
    Description: Near-infrared spectra of Jupiter's small inner satellites Amalthea and Thebe are similar to those of D-type asteroids in the 0.8- to 2.5-micrometer wavelength range. A deep absorption feature is detected at 3 micrometers in the spectra of the trailing side of Amalthea, which is similar to that of the non-ice components of Callisto and can be attributed to hydrous minerals. These surface materials cannot be explained if the satellite formed at its present orbit by accreting from a circumjovian nebula. Amalthea and Thebe may be the remnants of Jupiter's inflowing building blocks that formed in the outer part or outside of the circumjovian nebula.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Takato, Naruhisa -- Bus, Schelte J -- Terada, Hiroshi -- Pyo, Tae-Soo -- Kobayashi, Naoto -- New York, N.Y. -- Science. 2004 Dec 24;306(5705):2224-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Subaru Telescope, National Astronomical Observatory of Japan, 650 North Aohoku Place, Hilo, Hawaii 96720, USA. takato@naoj.org〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15618511" target="_blank"〉PubMed〈/a〉
    Keywords: Ice ; *Jupiter ; *Minerals ; Spectroscopy, Near-Infrared ; Temperature ; *Water
    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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  • 3
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    Breakthrough of the year. On Mars, a second chance for life (2004)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2004-12-18
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kerr, Richard A -- New York, N.Y. -- Science. 2004 Dec 17;306(5704):2010-2.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15604365" target="_blank"〉PubMed〈/a〉
    Keywords: Exobiology ; Ferric Compounds ; Geologic Sediments ; Life ; *Mars ; Robotics ; Salts ; Spacecraft ; Spectrum Analysis/instrumentation ; Temperature ; *Water
    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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  • 4
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    Phosphorylation of proteins by inositol pyrophosphates (2004)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2004-12-18
    Description: The inositol pyrophosphates IP7 and IP8 contain highly energetic pyrophosphate bonds. Although implicated in various biologic functions, their molecular sites of action have not been clarified. Using radiolabeled IP7, we detected phosphorylation of multiple eukaryotic proteins. We also observed phosphorylation of endogenous proteins by endogenous IP7 in yeast. Phosphorylation by IP7 is nonenzymatic and may represent a novel intracellular signaling mechanism.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Saiardi, Adolfo -- Bhandari, Rashna -- Resnick, Adam C -- Snowman, Adele M -- Snyder, Solomon H -- DA00074/DA/NIDA NIH HHS/ -- MH068830-02/MH/NIMH NIH HHS/ -- MH18501/MH/NIMH NIH HHS/ -- New York, N.Y. -- Science. 2004 Dec 17;306(5704):2101-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Neuroscience, Johns Hopkins University, School of Medicine, 725 North Wolfe Street, Baltimore, MD 21205, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15604408" target="_blank"〉PubMed〈/a〉
    Keywords: Adenosine Triphosphate/metabolism ; Amino Acid Sequence ; Amino Acid Substitution ; Animals ; Drosophila Proteins/metabolism ; Drosophila melanogaster ; Escherichia coli Proteins/metabolism ; Humans ; Inositol Phosphates/*metabolism ; Kinetics ; Magnesium/metabolism ; Mice ; Molecular Sequence Data ; Mutation ; Nuclear Proteins/chemistry/*metabolism ; Phosphates/metabolism ; Phosphorylation ; Phosphotransferases (Phosphate Group Acceptor)/metabolism ; Protein Kinases/genetics/metabolism ; Proteins/*metabolism ; RNA-Binding Proteins/chemistry/*metabolism ; Saccharomyces cerevisiae/metabolism ; Saccharomyces cerevisiae Proteins/chemistry/*metabolism ; Serine/metabolism ; Signal Transduction ; Temperature
    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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    Building programmable jigsaw puzzles with RNA (2004)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2004-12-18
    Description: One challenge in supramolecular chemistry is the design of versatile, self-assembling building blocks to attain total control of arrangement of matter at a molecular level. We have achieved reliable prediction and design of the three-dimensional structure of artificial RNA building blocks to generate molecular jigsaw puzzle units called tectosquares. They can be programmed with control over their geometry, topology, directionality, and addressability to algorithmically self-assemble into a variety of complex nanoscopic fabrics with predefined periodic and aperiodic patterns and finite dimensions. This work emphasizes the modular and hierarchical characteristics of RNA by showing that small RNA structural motifs can code the precise topology of large molecular architectures. It demonstrates that fully addressable materials based on RNA can be synthesized and provides insights into self-assembly processes involving large populations of RNA molecules.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Chworos, Arkadiusz -- Severcan, Isil -- Koyfman, Alexey Y -- Weinkam, Patrick -- Oroudjev, Emin -- Hansma, Helen G -- Jaeger, Luc -- New York, N.Y. -- Science. 2004 Dec 17;306(5704):2068-72.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemistry and Biochemistry, University of California, Santa Barbara, CA 93106-9510, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15604402" target="_blank"〉PubMed〈/a〉
    Keywords: Algorithms ; Base Sequence ; Chemistry, Physical ; Dimerization ; Magnesium ; Microscopy, Atomic Force ; *Nanostructures ; Nucleic Acid Conformation ; Oligoribonucleotides/chemistry ; Physicochemical Phenomena ; RNA/*chemistry ; RNA, Ribosomal/chemistry ; Temperature ; Thermodynamics
    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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    Breakthrough of the year (2004)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2004-12-18
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kennedy, Donald -- New York, N.Y. -- Science. 2004 Dec 17;306(5704):2001.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15604364" target="_blank"〉PubMed〈/a〉
    Keywords: Geologic Sediments ; *Mars ; Robotics ; *Science ; Spacecraft ; Temperature ; Water
    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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    Atmospheric imaging results from the Mars exploration rovers: Spirit and Opportunity (2004)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2004-12-04
    Description: A visible atmospheric optical depth of 0.9 was measured by the Spirit rover at Gusev crater and by the Opportunity rover at Meridiani Planum. Optical depth decreased by about 0.6 to 0.7% per sol through both 90-sol primary missions. The vertical distribution of atmospheric dust at Gusev crater was consistent with uniform mixing, with a measured scale height of 11.56 +/- 0.62 kilometers. The dust's cross section weighted mean radius was 1.47 +/- 0.21 micrometers (mm) at Gusev and 1.52 +/- 0.18 mm at Meridiani. Comparison of visible optical depths with 9-mm optical depths shows a visible-to-infrared optical depth ratio of 2.0 +/- 0.2 for comparison with previous monitoring of infrared optical depths.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lemmon, M T -- Wolff, M J -- Smith, M D -- Clancy, R T -- Banfield, D -- Landis, G A -- Ghosh, A -- Smith, P H -- Spanovich, N -- Whitney, B -- Whelley, P -- Greeley, R -- Thompson, S -- Bell, J F 3rd -- Squyres, S W -- New York, N.Y. -- Science. 2004 Dec 3;306(5702):1753-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Texas A&M University, College Station, TX 77843, USA. lemmon@tamu.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15576613" target="_blank"〉PubMed〈/a〉
    Keywords: Algorithms ; Atmosphere ; Carbon Dioxide ; Extraterrestrial Environment ; *Mars ; Solar System ; Spacecraft ; Temperature
    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
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    The duration of forest stages in southern Europe and interglacial climate variability (2004)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2004-12-04
    Description: Foraminiferal oxygen isotope and pollen analyses from a deep-sea sequence off southwest Portugal show that the duration of temperate stages on land over the past 350,000 years varied considerably. The record shows forest contractions during intervals of low ice volume, coeval with declines in atmospheric methane, after which tree populations did not always recover. What emerges is that, although the broad timing of interglacials is consistent with orbital theory, their specific duration may be dictated by millennial variability. This complicates the prediction of the natural duration of interglacials, at least until the origin of this climate variability is understood.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Tzedakis, P C -- Roucoux, K H -- de Abreu, L -- Shackleton, N J -- New York, N.Y. -- Science. 2004 Dec 24;306(5705):2231-5. Epub 2004 Dec 2.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Earth and Biosphere Institute, School of Geography, University of Leeds, Leeds, LS2 9JT, UK. P.C.Tzedakis@leeds.ac.uk〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15576573" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Atmosphere ; *Climate ; Europe ; Ice ; Methane ; Olea ; Oxygen Isotopes ; Plankton ; Pollen ; Portugal ; Quercus ; Temperature ; Time ; *Trees
    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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  • 9
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    First Atmospheric Science Results from the Mars Exploration Rovers Mini-TES (2004)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2004-12-04
    Description: Thermal infrared spectra of the martian atmosphere taken by the Miniature Thermal Emission Spectrometer (Mini-TES) were used to determine the atmospheric temperatures in the planetary boundary layer and the column-integrated optical depth of aerosols. Mini-TES observations show the diurnal variation of the martian boundary layer thermal structure, including a near-surface superadiabatic layer during the afternoon and an inversion layer at night. Upward-looking Mini-TES observations show warm and cool parcels of air moving through the Mini-TES field of view on a time scale of 30 seconds. The retrieved dust optical depth shows a downward trend at both sites.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Smith, Michael D -- Wolff, Michael J -- Lemmon, Mark T -- Spanovich, Nicole -- Banfield, Don -- Budney, Charles J -- Clancy, R Todd -- Ghosh, Amitabha -- Landis, Geoffrey A -- Smith, Peter -- Whitney, Barbara -- Christensen, Philip R -- Squyres, Steven W -- New York, N.Y. -- Science. 2004 Dec 3;306(5702):1750-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA. Michael.D.Smith@nasa.gov〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15576612" target="_blank"〉PubMed〈/a〉
    Keywords: Algorithms ; Atmosphere ; Carbon Dioxide ; Extraterrestrial Environment ; *Mars ; Seasons ; Spectrum Analysis ; Temperature ; Water
    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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  • 10
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    A late-transition metal oxo complex: K7Na9[O=PtIV(H2O)L2], L = [PW9O34]9 (2004)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2004-11-27
    Description: Terminal mono-oxo complexes of the late transition metal elements have long been considered too unstable to synthesize because of repulsion between the oxygen electrons and the mostly filled metal d orbitals. A platinum(IV)-oxo compound flanked by two polytungstate ligands, K7Na9[O=Pt(H2O)L2], L = [PW9O34(9-)], has now been prepared and isolated at room temperature as air-stable brown crystals. X-ray and neutron diffraction at 30 kelvin revealed a very short [1.720(18) angstrom] Pt-O bond and no evidence of a hydrogen atom at the terminal oxygen, ruling out a better precedented Pt-OH complex. Density functional theory and spectroscopic data account for the stability of the Pt(IV)-oxo unit by electron withdrawal into delocalized orbitals of the polytungstates.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Anderson, Travis M -- Neiwert, Wade A -- Kirk, Martin L -- Piccoli, Paula M B -- Schultz, Arthur J -- Koetzle, Thomas F -- Musaev, Djamaladdin G -- Morokuma, Keiji -- Cao, Rui -- Hill, Craig L -- GM-057378/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2004 Dec 17;306(5704):2074-7. Epub 2004 Nov 25.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemistry, Emory University, Atlanta, GA 30322, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15564312" target="_blank"〉PubMed〈/a〉
    Keywords: Chemistry, Physical ; Crystallization ; Crystallography, X-Ray ; Electrons ; Fourier Analysis ; Hydrogen-Ion Concentration ; Ligands ; Molecular Structure ; Neutron Diffraction ; Oxidation-Reduction ; Oxygen/*chemistry ; Physicochemical Phenomena ; Platinum/chemistry ; Platinum Compounds/chemical synthesis/*chemistry/isolation & purification ; Spectrum Analysis ; Temperature ; Tungsten/chemistry ; Tungsten Compounds/chemical synthesis/*chemistry/isolation & purification
    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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