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  • Temperature  (47)
  • American Association for the Advancement of Science (AAAS)  (47)
  • American Physical Society
  • Annual Reviews
  • Blackwell Publishing Ltd
  • Springer
  • 2005-2009  (47)
  • 1990-1994
  • 1980-1984
  • 2007  (47)
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  • American Association for the Advancement of Science (AAAS)  (47)
  • American Physical Society
  • Annual Reviews
  • Blackwell Publishing Ltd
  • Springer
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  • 2005-2009  (47)
  • 1990-1994
  • 1980-1984
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  • 1
    Publication Date: 2007-04-28
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Peng, Changhui -- Ouyang, Hua -- Gao, Qiong -- Jiang, Yuan -- Zhang, Feng -- Li, Jun -- Yu, Qiang -- New York, N.Y. -- Science. 2007 Apr 27;316(5824):546-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institut des Sciences de L'Environnement, Departement des Sciences Biologiques, Universite du Quebec a Montreal, Montreal, QC, Canada, H3C 3P8.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17463272" target="_blank"〉PubMed〈/a〉
    Keywords: Animal Migration ; Animals ; China ; *Conservation of Natural Resources/legislation & jurisprudence ; *Ecosystem ; *Environment ; Fresh Water ; Plants ; *Railroads ; Refuse Disposal ; Temperature ; Travel
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  • 2
    Publication Date: 2007-05-15
    Description: Titan's lower atmosphere has long been known to harbor organic aerosols (tholins) presumed to have been formed from simple molecules, such as methane and nitrogen (CH4 and N2). Up to now, it has been assumed that tholins were formed at altitudes of several hundred kilometers by processes as yet unobserved. Using measurements from a combination of mass/charge and energy/charge spectrometers on the Cassini spacecraft, we have obtained evidence for tholin formation at high altitudes (approximately 1000 kilometers) in Titan's atmosphere. The observed chemical mix strongly implies a series of chemical reactions and physical processes that lead from simple molecules (CH4 and N2) to larger, more complex molecules (80 to 350 daltons) to negatively charged massive molecules (approximately 8000 daltons), which we identify as tholins. That the process involves massive negatively charged molecules and aerosols is completely unexpected.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Waite, J H Jr -- Young, D T -- Cravens, T E -- Coates, A J -- Crary, F J -- Magee, B -- Westlake, J -- New York, N.Y. -- Science. 2007 May 11;316(5826):870-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Space Science and Engineering Division, Southwest Research Institute (SWRI), 6220 Culebra Road, San Antonio, TX 78238, USA. hwaite@swri.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17495166" target="_blank"〉PubMed〈/a〉
    Keywords: Aerosols ; Atmosphere ; *Benzene ; Extraterrestrial Environment ; *Hydrocarbons ; Ions ; Molecular Weight ; *Nitriles ; Photochemistry ; *Saturn ; Spacecraft ; Temperature ; Ultraviolet Rays
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  • 3
    Publication Date: 2007-05-05
    Description: The initial electron transfer dynamics during photosynthesis have been studied in Rhodobacter sphaeroides reaction centers from wild type and 14 mutants in which the driving force and the kinetics of charge separation vary over a broad range. Surprisingly, the protein relaxation kinetics, as measured by tryptophan absorbance changes, are invariant in these mutants. By applying a reaction-diffusion model, we can fit the complex electron transfer kinetics of each mutant quantitatively, varying only the driving force. These results indicate that initial photosynthetic charge separation is limited by protein dynamics rather than by a static electron transfer barrier.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wang, Haiyu -- Lin, Su -- Allen, James P -- Williams, Joann C -- Blankert, Sean -- Laser, Christa -- Woodbury, Neal W -- New York, N.Y. -- Science. 2007 May 4;316(5825):747-50.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Biodesign Institute, Arizona State University, 1001 South McAllister Avenue, Tempe, AZ 85287-5201, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17478721" target="_blank"〉PubMed〈/a〉
    Keywords: Bacterial Proteins/*chemistry/genetics/*metabolism ; Bacteriochlorophylls/metabolism ; *Electron Transport ; Kinetics ; Light ; Models, Chemical ; Mutation ; *Photosynthesis ; Photosynthetic Reaction Center Complex Proteins/*chemistry/genetics/*metabolism ; Rhodobacter sphaeroides/genetics/*metabolism ; Spectrum Analysis ; Temperature ; Thermodynamics ; Tryptophan/chemistry
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  • 4
    Publication Date: 2007-10-13
    Description: When the solar wind hits Jupiter's magnetic field, it creates a long magnetotail trailing behind the planet that channels material out of the Jupiter system. The New Horizons spacecraft traversed the length of the jovian magnetotail to 〉2500 jovian radii (RJ; 1 RJ identical with 71,400 kilometers), observing a high-temperature, multispecies population of energetic particles. Velocity dispersions, anisotropies, and compositional variation seen in the deep-tail (greater, similar 500 RJ) with a approximately 3-day periodicity are similar to variations seen closer to Jupiter in Galileo data. The signatures suggest plasma streaming away from the planet and injection sites in the near-tail region (approximately 200 to 400 RJ) that could be related to magnetic reconnection events. The tail structure remains coherent at least until it reaches the magnetosheath at 1655 RJ.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉McNutt, R L Jr -- Haggerty, D K -- Hill, M E -- Krimigis, S M -- Livi, S -- Ho, G C -- Gurnee, R S -- Mauk, B H -- Mitchell, D G -- Roelof, E C -- McComas, D J -- Bagenal, F -- Elliott, H A -- Brown, L E -- Kusterer, M -- Vandegriff, J -- Stern, S A -- Weaver, H A -- Spencer, J R -- Moore, J M -- New York, N.Y. -- Science. 2007 Oct 12;318(5848):220-2.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Applied Physics Laboratory, Johns Hopkins University, Laurel, MD 20723, USA. ralph.mcnutt@jhuapl.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17932283" target="_blank"〉PubMed〈/a〉
    Keywords: Electrons ; Extraterrestrial Environment ; Ions ; *Jupiter ; Oxygen ; Protons ; Spacecraft ; Sulfur ; Temperature
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  • 5
    Publication Date: 2007-01-20
    Description: Litter decomposition provides the primary source of mineral nitrogen (N) for biological activity in most terrestrial ecosystems. A 10-year decomposition experiment in 21 sites from seven biomes found that net N release from leaf litter is dominantly driven by the initial tissue N concentration and mass remaining regardless of climate, edaphic conditions, or biota. Arid grasslands exposed to high ultraviolet radiation were an exception, where net N release was insensitive to initial N. Roots released N linearly with decomposition and exhibited little net N immobilization. We suggest that fundamental constraints on decomposer physiologies lead to predictable global-scale patterns in net N release during decomposition.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Parton, William -- Silver, Whendee L -- Burke, Ingrid C -- Grassens, Leo -- Harmon, Mark E -- Currie, William S -- King, Jennifer Y -- Adair, E Carol -- Brandt, Leslie A -- Hart, Stephen C -- Fasth, Becky -- New York, N.Y. -- Science. 2007 Jan 19;315(5810):361-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Natural Resource Ecology Laboratory, Colorado State University, 200 West Lake, Campus Mail 1499, Fort Collins, CO 80523-1499, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17234944" target="_blank"〉PubMed〈/a〉
    Keywords: *Biodegradation, Environmental ; Carbon/metabolism ; Climate ; *Ecosystem ; Humidity ; Mathematics ; Nitrogen/*metabolism ; Plant Leaves/metabolism ; Plant Roots/metabolism ; Plants/*metabolism ; Poaceae ; Regression Analysis ; Seasons ; Soil Microbiology ; Temperature ; Time Factors ; Trees
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  • 6
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2007-09-01
    Description: Selectivity rules in organic chemistry have been inferred largely from nonaqueous environments. In contrast, enzymes operate in water, and the chemical effect of the medium change remains only partially understood. Structural characterization of the "ladder" polyether marine natural products raised a puzzle that persisted for 20 years: Although the stereochemistry of adjacent tetrahydropyran (THP) cycles would seem to arise from a biosynthetic cascade of epoxide-opening reactions, experience in organic solvents argued consistently that such a pathway would be kinetically disfavored. We report that neutral water acts as an optimal promoter for the requisite ring-opening selectivity, once a single templating THP is appended to a chain of epoxides. This strategy offers a high-yielding route to the naturally occurring ladder core and highlights the likely importance of aqueous-medium effects in underpinning certain noteworthy enzymatic selectivities.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2810534/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2810534/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Vilotijevic, Ivan -- Jamison, Timothy F -- R01 GM-72566/GM/NIGMS NIH HHS/ -- R01 GM072566/GM/NIGMS NIH HHS/ -- R01 GM072566-05/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2007 Aug 31;317(5842):1189-92.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17761875" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Chemistry, Organic/*methods ; Dinoflagellida/metabolism ; Epoxy Compounds/*chemistry ; Ethers/chemical synthesis/*chemistry/metabolism ; Marine Toxins/biosynthesis/chemistry ; Molecular Conformation ; Pyrans/*chemistry ; Solvents ; Temperature ; Thermodynamics ; Water/*chemistry
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  • 7
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2007-01-16
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Fisher, Charles R -- Girguis, Peter -- New York, N.Y. -- Science. 2007 Jan 12;315(5809):198-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biology, Pennsylvania State University, University Park, PA 16801, USA. cfisher@psu.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17218516" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Bacterial Proteins/analysis/*metabolism ; Carbon/metabolism ; Carbon Isotopes/analysis ; Chemoautotrophic Growth ; Citric Acid Cycle ; *Ecosystem ; Gammaproteobacteria/*metabolism ; Metabolic Networks and Pathways ; Oxidation-Reduction ; Pacific Ocean ; Polychaeta/*microbiology/*physiology ; Proteome ; *Proteomics ; Reproduction ; Sulfides/metabolism ; *Symbiosis ; Temperature
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  • 8
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2007-05-05
    Description: 〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3984475/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3984475/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Skourtis, Spiros S -- Beratan, David N -- R01 GM048043/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2007 May 4;316(5825):703-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physics, University of Cyprus, Nicosia 1678, Cyprus. skourtis@ucy.ac.cy〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17478711" target="_blank"〉PubMed〈/a〉
    Keywords: Bacterial Proteins/*chemistry/*metabolism ; Bacteriochlorophylls/metabolism ; *Electron Transport ; Kinetics ; Light ; Models, Chemical ; *Photosynthesis ; Photosynthetic Reaction Center Complex Proteins/*chemistry/*metabolism ; Rhodobacter sphaeroides/genetics/*metabolism ; Spectrum Analysis ; Temperature ; Thermodynamics ; Tryptophan/chemistry
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  • 9
    Publication Date: 2007-03-31
    Description: A marine ecosystem model seeded with many phytoplankton types, whose physiological traits were randomly assigned from ranges defined by field and laboratory data, generated an emergent community structure and biogeography consistent with observed global phytoplankton distributions. The modeled organisms included types analogous to the marine cyanobacterium Prochlorococcus. Their emergent global distributions and physiological properties simultaneously correspond to observations. This flexible representation of community structure can be used to explore relations between ecosystems, biogeochemical cycles, and climate change.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Follows, Michael J -- Dutkiewicz, Stephanie -- Grant, Scott -- Chisholm, Sallie W -- New York, N.Y. -- Science. 2007 Mar 30;315(5820):1843-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, 54-1514 MIT, Cambridge, MA 02139, USA. mick@mit.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17395828" target="_blank"〉PubMed〈/a〉
    Keywords: Biomass ; Computer Simulation ; *Ecosystem ; Geography ; Light ; Mathematics ; Models, Biological ; Oceans and Seas ; Phytoplankton/growth & development/*physiology ; Prochlorococcus/growth & development/*physiology ; Seawater/*microbiology ; Temperature
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  • 10
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2007-03-17
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Krajick, Kevin -- New York, N.Y. -- Science. 2007 Mar 16;315(5818):1527.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17363662" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Arctic Regions ; Biodiversity ; *Cold Climate ; *Ecosystem ; Food Chain ; Ice Cover ; Invertebrates ; Plankton/growth & development ; Population Dynamics ; *Seawater ; Temperature
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  • 11
    Publication Date: 2007-08-04
    Description: To identify cytoskeletal proteins that change conformation or assembly within stressed cells, in situ labeling of sterically shielded cysteines with fluorophores was analyzed by fluorescence imaging, quantitative mass spectrometry, and sequential two-dye labeling. Within red blood cells, shotgun labeling showed that shielded cysteines in the two isoforms of the cytoskeletal protein spectrin were increasingly labeled as a function of shear stress and time, indicative of forced unfolding of specific domains. Within mesenchymal stem cells-as a prototypical adherent cell-nonmuscle myosin IIA and vimentin are just two of the cytoskeletal proteins identified that show differential labeling in tensed versus drug-relaxed cells. Cysteine labeling of proteins within live cells can thus be used to fluorescently map out sites of molecular-scale deformation, and the results also suggest means to colocalize signaling events such as phosphorylation with forced unfolding.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2741095/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2741095/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Johnson, Colin P -- Tang, Hsin-Yao -- Carag, Christine -- Speicher, David W -- Discher, Dennis E -- R01 EB007049/EB/NIBIB NIH HHS/ -- R01 EB007049-01/EB/NIBIB NIH HHS/ -- R01 EB007049-02/EB/NIBIB NIH HHS/ -- R01 EB007049-03/EB/NIBIB NIH HHS/ -- R01 HL062352/HL/NHLBI NIH HHS/ -- R01 HL062352-09A1/HL/NHLBI NIH HHS/ -- R21 AR056128/AR/NIAMS NIH HHS/ -- R21 AR056128-01A1/AR/NIAMS NIH HHS/ -- R21 AR056128-02/AR/NIAMS NIH HHS/ -- S10 RR022575/RR/NCRR NIH HHS/ -- S10 RR022575-01A1/RR/NCRR NIH HHS/ -- New York, N.Y. -- Science. 2007 Aug 3;317(5838):663-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Biophysical Engineering Lab, University of Pennsylvania, Philadelphia, PA 19104, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17673662" target="_blank"〉PubMed〈/a〉
    Keywords: Chromatography, Liquid ; Cysteine/chemistry ; Cytoskeletal Proteins/*chemistry ; Erythrocytes/*chemistry ; Fluorescence ; Fluorescent Antibody Technique ; Fluorescent Dyes ; Heterocyclic Compounds with 4 or More Rings/pharmacology ; Humans ; Mesenchymal Stromal Cells/*chemistry ; Naphthalenesulfonates ; Nonmuscle Myosin Type IIA/chemistry ; *Protein Conformation ; *Protein Folding ; Protein Structure, Quaternary ; Protein Structure, Tertiary ; Spectrin/chemistry ; Stress, Mechanical ; Tandem Mass Spectrometry ; Temperature ; Vimentin/chemistry
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  • 12
    Publication Date: 2007-01-06
    Description: A cause-and-effect understanding of climate influences on ecosystems requires evaluation of thermal limits of member species and of their ability to cope with changing temperatures. Laboratory data available for marine fish and invertebrates from various climatic regions led to the hypothesis that, as a unifying principle, a mismatch between the demand for oxygen and the capacity of oxygen supply to tissues is the first mechanism to restrict whole-animal tolerance to thermal extremes. We show in the eelpout, Zoarces viviparus, a bioindicator fish species for environmental monitoring from North and Baltic Seas (Helcom), that thermally limited oxygen delivery closely matches environmental temperatures beyond which growth performance and abundance decrease. Decrements in aerobic performance in warming seas will thus be the first process to cause extinction or relocation to cooler waters.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Portner, Hans O -- Knust, Rainer -- New York, N.Y. -- Science. 2007 Jan 5;315(5808):95-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Alfred Wegener Institute for Polar and Marine Research, Animal Ecophysiology, Postfach 12 01 61, 27515 Bremerhaven, Germany. hpoertner@awi-bremerhaven.de〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17204649" target="_blank"〉PubMed〈/a〉
    Keywords: Acclimatization ; Aerobiosis ; Animals ; Blood Circulation ; Body Size ; *Climate ; *Ecosystem ; North Sea ; Oxygen/analysis/blood/*metabolism ; Oxygen Consumption ; Perciformes/growth & development/*physiology ; Population Dynamics ; Population Growth ; Seasons ; Seawater/chemistry ; Temperature
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  • 13
    Publication Date: 2007-04-07
    Description: Information on responses of higher organisms to climate change is dominated by events in spring. Far less is known about autumnal events and virtually nothing about communities of microorganisms. We analyzed autumnal fruiting patterns of macrofungi over the past 56 years and found that average first fruiting date of 315 species is earlier, while last fruiting date is later. Fruiting of mycorrhizal species that associate with both deciduous and coniferous trees is delayed in deciduous, but not in coniferous, forests. Many species are now fruiting twice a year, indicating increased mycelial activity and possibly greater decay rates in ecosystems.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Gange, A C -- Gange, E G -- Sparks, T H -- Boddy, L -- New York, N.Y. -- Science. 2007 Apr 6;316(5821):71.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉School of Biological Sciences, Royal Holloway, University of London, Egham, Surrey TW20 0EX, UK. a.gange@rhul.ac.uk〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17412949" target="_blank"〉PubMed〈/a〉
    Keywords: Coniferophyta/microbiology ; *Ecosystem ; England ; Fruiting Bodies, Fungal/*growth & development ; Fungi/*growth & development ; Mycorrhizae/*growth & development ; Seasons ; Temperature ; Time Factors ; Trees/microbiology
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  • 14
    Publication Date: 2007-04-21
    Description: Sex in reptiles is determined by genes on sex chromosomes or by incubation temperature. Previously these two modes were thought to be distinct, yet we show that high incubation temperatures reverse genotypic males (ZZ) to phenotypic females in a lizard with ZZ and ZW sex chromosomes. Thus, the W chromosome is not necessary for female differentiation. Sex determination is probably via a dosage-sensitive male-determining gene on the Z chromosome that is inactivated by extreme temperatures. Our data invite a novel hypothesis for the evolution of temperature-dependent sex determination (TSD) and suggest that sex chromosomes may exist in many TSD reptiles.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Quinn, Alexander E -- Georges, Arthur -- Sarre, Stephen D -- Guarino, Fiorenzo -- Ezaz, Tariq -- Graves, Jennifer A Marshall -- New York, N.Y. -- Science. 2007 Apr 20;316(5823):411.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute for Applied Ecology, University of Canberra, ACT 2601, Australia. quinn@aerg.canberra.edu.au〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17446395" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Disorders of Sex Development ; Female ; *Gene Dosage ; Genotype ; Lizards/embryology/*genetics/*physiology ; Male ; Phenotype ; Polymerase Chain Reaction ; Sex Chromosomes/genetics ; Sex Determination Processes ; Sex Ratio ; Temperature
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  • 15
    Publication Date: 2007-06-02
    Description: The evolution of the martian core is widely assumed to mirror the characteristics observed for Earth's core. Data from experiments performed on iron-sulfur and iron-nickel-sulfur systems at pressures corresponding to the center of Mars indicate that its core is presently completely liquid and that it will not form an outwardly crystallizing iron-rich inner core, as does Earth. Instead, planetary cooling will lead to core crystallization following either a "snowing-core" model, whereby iron-rich solids nucleate in the outer portions of the core and sink toward the center, or a "sulfide inner-core" model, where an iron-sulfide phase crystallizes to form a solid inner core.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Stewart, Andrew J -- Schmidt, Max W -- van Westrenen, Wim -- Liebske, Christian -- New York, N.Y. -- Science. 2007 Jun 1;316(5829):1323-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute for Mineralogy and Petrology, Eidgenossische Technische Hochschule Zurich, CH 8092 Zurich, Switzerland.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17540900" target="_blank"〉PubMed〈/a〉
    Keywords: Crystallization ; *Evolution, Planetary ; Iron ; *Mars ; Pressure ; Sulfides ; Sulfur ; Temperature
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  • 16
    Publication Date: 2007-09-29
    Description: Although the application of sequencing-by-synthesis techniques to DNA extracted from bones has revolutionized the study of ancient DNA, it has been plagued by large fractions of contaminating environmental DNA. The genetic analyses of hair shafts could be a solution: We present 10 previously unexamined Siberian mammoth (Mammuthus primigenius) mitochondrial genomes, sequenced with up to 48-fold coverage. The observed levels of damage-derived sequencing errors were lower than those observed in previously published frozen bone samples, even though one of the specimens was 〉50,000 14C years old and another had been stored for 200 years at room temperature. The method therefore sets the stage for molecular-genetic analysis of museum collections.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Gilbert, M Thomas P -- Tomsho, Lynn P -- Rendulic, Snjezana -- Packard, Michael -- Drautz, Daniela I -- Sher, Andrei -- Tikhonov, Alexei -- Dalen, Love -- Kuznetsova, Tatyana -- Kosintsev, Pavel -- Campos, Paula F -- Higham, Thomas -- Collins, Matthew J -- Wilson, Andrew S -- Shidlovskiy, Fyodor -- Buigues, Bernard -- Ericson, Per G P -- Germonpre, Mietje -- Gotherstrom, Anders -- Iacumin, Paola -- Nikolaev, Vladimir -- Nowak-Kemp, Malgosia -- Willerslev, Eske -- Knight, James R -- Irzyk, Gerard P -- Perbost, Clotilde S -- Fredrikson, Karin M -- Harkins, Timothy T -- Sheridan, Sharon -- Miller, Webb -- Schuster, Stephan C -- HG002238/HG/NHGRI NIH HHS/ -- New York, N.Y. -- Science. 2007 Sep 28;317(5846):1927-30.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Centre for Ancient Genetics, University of Copenhagen, Universitetsparken 15, DK-2100 Copenhagen, Denmark.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17901335" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Bone and Bones/chemistry ; DNA Damage ; DNA, Mitochondrial/chemistry/genetics/*history ; Elephants/*genetics ; Genes, Mitochondrial ; *Genome ; *Hair/chemistry/ultrastructure ; History, Ancient ; Mitochondria/*genetics ; Molecular Sequence Data ; Preservation, Biological ; *Sequence Analysis, DNA ; Siberia ; Temperature
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  • 17
    Publication Date: 2007-10-13
    Description: Several observations of Jupiter's atmosphere made by instruments on the New Horizons spacecraft have implications for the stability and dynamics of Jupiter's weather layer. Mesoscale waves, first seen by Voyager, have been observed at a spatial resolution of 11 to 45 kilometers. These waves have a 300-kilometer wavelength and phase velocities greater than the local zonal flow by 100 meters per second, much higher than predicted by models. Additionally, infrared spectral measurements over five successive Jupiter rotations at spatial resolutions of 200 to 140 kilometers have shown the development of transient ammonia ice clouds (lifetimes of 40 hours or less) in regions of strong atmospheric upwelling. Both of these phenomena serve as probes of atmospheric dynamics below the visible cloud tops.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Reuter, D C -- Simon-Miller, A A -- Lunsford, A -- Baines, K H -- Cheng, A F -- Jennings, D E -- Olkin, C B -- Spencer, J R -- Stern, S A -- Weaver, H A -- Young, L A -- New York, N.Y. -- Science. 2007 Oct 12;318(5848):223-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉NASA Goddard Space Flight Center, Code 693, Greenbelt, MD 20771, USA. dennis.c.reuter@nasa.gov〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17932284" target="_blank"〉PubMed〈/a〉
    Keywords: Ammonia ; Atmosphere ; Extraterrestrial Environment ; *Jupiter ; Spacecraft ; Temperature
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  • 18
    Publication Date: 2007-01-06
    Description: The late Paleozoic deglaciation is the vegetated Earth's only recorded icehouse-to-greenhouse transition, yet the climate dynamics remain enigmatic. By using the stable isotopic compositions of soil-formed minerals, fossil-plant matter, and shallow-water brachiopods, we estimated atmospheric partial pressure of carbon dioxide (pCO2) and tropical marine surface temperatures during this climate transition. Comparison to southern Gondwanan glacial records documents covariance between inferred shifts in pCO2, temperature, and ice volume consistent with greenhouse gas forcing of climate. Major restructuring of paleotropical flora in western Euramerica occurred in step with climate and pCO2 shifts, illustrating the biotic impact associated with past CO2-forced turnover to a permanent ice-free world.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Montanez, Isabel P -- Tabor, Neil J -- Niemeier, Deb -- Dimichele, William A -- Frank, Tracy D -- Fielding, Christopher R -- Isbell, John L -- Birgenheier, Lauren P -- Rygel, Michael C -- New York, N.Y. -- Science. 2007 Jan 5;315(5808):87-91.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Geology, University of California, Davis, CA 95616, USA. montanez@geology.ucdavis.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17204648" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Atmosphere ; Biodiversity ; Calcium Carbonate/analysis ; *Carbon Dioxide ; Carbon Isotopes ; *Climate ; *Ecosystem ; Fossils ; Greenhouse Effect ; Ice Cover ; Invertebrates/chemistry ; *Plants ; Seasons ; Soil/analysis ; Temperature ; Time
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 19
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2007-10-13
    Description: Precipitation is expected in Titan's atmosphere, yet it has not been directly observed, and the geographical regions where rain occurs are unknown. Here we present near-infrared spectra from the Very Large Telescope and W. M. Keck Observatories that reveal an enhancement of opacity in Titan's troposphere on the morning side of the leading hemisphere. Retrieved extinction profiles are consistent with condensed methane in clouds at an altitude near 30 kilometers and concomitant methane drizzle below. The moisture encompasses the equatorial region over Titan's brightest continent, Xanadu. Diurnal temperature gradients that cause variations in methane relative humidity, winds, and topography may each be a contributing factor to the condensation mechanism. The clouds and precipitation are optically thin at 2.0 micrometers, and models of "subvisible" clouds suggest that the droplets are 0.1 millimeter or larger.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Adamkovics, Mate -- Wong, Michael H -- Laver, Conor -- de Pater, Imke -- New York, N.Y. -- Science. 2007 Nov 9;318(5852):962-5. Epub 2007 Oct 11.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Astronomy, University of California, Berkeley, CA 94611, USA. mate@berkeley.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17932256" target="_blank"〉PubMed〈/a〉
    Keywords: Atmosphere ; Extraterrestrial Environment ; *Methane ; *Saturn ; Temperature
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  • 20
    Publication Date: 2007-10-06
    Description: The reproductive organs of some plants self-heat, release scent, and attract pollinators. The relations among these processes are not well understood, especially in the more ancient, nonflowering gymnosperm lineages. We describe the influence of plant volatiles in an obligate pollination mutualism between an Australian Macrozamia cycad (a gymnosperm with male and female individuals) and its specialist thrips pollinator, Cycadothrips chadwicki. Pollen-laden thrips leave male cycad cones en masse during the daily thermogenic phase, when cone temperatures and volatile emissions increase dramatically and thrips are repelled. As thermogenesis declines, total volatile emissions diminish and cones attract thrips, resulting in pollination of female cones. Behavioral and electrophysiological tests on thrips reveal that variations in b-myrcene and ocimene emissions by male and female cones are sufficient to explain the observed sequential thrips' repellence (push) and attraction (pull). These dynamic interactions represent complex adaptations that enhance the likelihood of pollination and may reflect an intermediate state in the evolution of biotic pollination.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Terry, Irene -- Walter, Gimme H -- Moore, Chris -- Roemer, Robert -- Hull, Craig -- New York, N.Y. -- Science. 2007 Oct 5;318(5847):70.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biology, University of Utah, Salt Lake City, UT 84112, USA. terry@biology.utah.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17916726" target="_blank"〉PubMed〈/a〉
    Keywords: Alkenes ; Animals ; Biological Evolution ; Circadian Rhythm ; Cues ; Electrophysiology ; Flowers ; Insects/*physiology ; Monoterpenes ; *Odors ; *Pollen ; Polyenes ; Temperature ; Zamiaceae/*physiology
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  • 21
    Publication Date: 2007-07-28
    Description: Only five bacterial phyla with members capable of chlorophyll (Chl)-based phototrophy are presently known. Metagenomic data from the phototrophic microbial mats of alkaline siliceous hot springs in Yellowstone National Park revealed the existence of a distinctive bacteriochlorophyll (BChl)-synthesizing, phototrophic bacterium. A highly enriched culture of this bacterium grew photoheterotrophically, synthesized BChls a and c under oxic conditions, and had chlorosomes and type 1 reaction centers. "Candidatus Chloracidobacterium thermophilum" is a BChl-producing member of the poorly characterized phylum Acidobacteria.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Bryant, Donald A -- Costas, Amaya M Garcia -- Maresca, Julia A -- Chew, Aline Gomez Maqueo -- Klatt, Christian G -- Bateson, Mary M -- Tallon, Luke J -- Hostetler, Jessica -- Nelson, William C -- Heidelberg, John F -- Ward, David M -- New York, N.Y. -- Science. 2007 Jul 27;317(5837):523-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biochemistry and Molecular Biology, Pennsylvania State University, University Park, PA 16802, USA. dab14@psu.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17656724" target="_blank"〉PubMed〈/a〉
    Keywords: Bacteria, Aerobic/*classification/*isolation & ; purification/physiology/ultrastructure ; Bacterial Chromatophores/ultrastructure ; Bacteriochlorophylls/biosynthesis ; Computational Biology ; Ecosystem ; Genome, Bacterial ; Genomics ; Hot Springs/*microbiology ; Molecular Sequence Data ; Photosystem I Protein Complex/analysis ; *Phototrophic Processes ; RNA, Ribosomal, 16S/genetics ; Temperature ; Wyoming
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  • 22
    Publication Date: 2007-06-30
    Description: Diapause is a protective response to unfavorable environments that results in a suspension of insect development and is most often associated with the onset of winter. The ls-tim mutation in the Drosophila melanogaster clock gene timeless has spread in Europe over the past 10,000 years, possibly because it enhances diapause. We show that the mutant allele attenuates the photosensitivity of the circadian clock and causes decreased dimerization of the mutant TIMELESS protein isoform to CRYPTOCHROME, the circadian photoreceptor. This interaction results in a more stable TIMELESS product. These findings reveal a molecular link between diapause and circadian photoreception.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sandrelli, Federica -- Tauber, Eran -- Pegoraro, Mirko -- Mazzotta, Gabriella -- Cisotto, Paola -- Landskron, Johannes -- Stanewsky, Ralf -- Piccin, Alberto -- Rosato, Ezio -- Zordan, Mauro -- Costa, Rodolfo -- Kyriacou, Charalambos P -- New York, N.Y. -- Science. 2007 Jun 29;316(5833):1898-900.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biology, University of Padova, 35131 Padova, Italy.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17600216" target="_blank"〉PubMed〈/a〉
    Keywords: Alleles ; Animals ; *Circadian Rhythm/genetics ; Climate ; Cryptochromes ; Dimerization ; Drosophila Proteins/chemistry/*genetics/*metabolism ; Drosophila melanogaster/*genetics/metabolism/*physiology ; Europe ; Female ; Flavoproteins/*metabolism ; Light ; Motor Activity ; Mutation ; *Photoperiod ; Protein Isoforms/chemistry/genetics/metabolism ; Seasons ; *Selection, Genetic ; Temperature ; Transgenes ; Two-Hybrid System Techniques
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  • 23
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2007-04-28
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Schilling, Govert -- New York, N.Y. -- Science. 2007 Apr 27;316(5824):528.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17463257" target="_blank"〉PubMed〈/a〉
    Keywords: Astronomical Phenomena ; *Astronomy ; *Exobiology ; Planets ; Temperature ; Water
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  • 24
    Publication Date: 2007-07-07
    Description: Current single-molecule detection techniques require labeling the target molecule. We report a highly specific and sensitive optical sensor based on an ultrahigh quality (Q) factor (Q 〉 10(8)) whispering-gallery microcavity. The silica surface is functionalized to bind the target molecule; binding is detected by a resonant wavelength shift. Single-molecule detection is confirmed by observation of single-molecule binding events that shift the resonant frequency, as well as by the statistics for these shifts over many binding events. These shifts result from a thermo-optic mechanism. Additionally, label-free, single-molecule detection of interleukin-2 was demonstrated in serum. These experiments demonstrate a dynamic range of 10(12) in concentration, establishing the microcavity as a sensitive and versatile detector.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Armani, Andrea M -- Kulkarni, Rajan P -- Fraser, Scott E -- Flagan, Richard C -- Vahala, Kerry J -- New York, N.Y. -- Science. 2007 Aug 10;317(5839):783-7. Epub 2007 Jul 5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Applied Physics, MC 128-95, California Institute of Technology, Pasadena, CA 91125, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17615303" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antibodies ; Cattle ; Chemistry Techniques, Analytical/*methods ; Interleukin-2/*analysis/blood/immunology ; Lasers ; *Optics and Photonics ; Temperature
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  • 25
    Publication Date: 2007-12-15
    Description: Atmospheric carbon dioxide concentration is expected to exceed 500 parts per million and global temperatures to rise by at least 2 degrees C by 2050 to 2100, values that significantly exceed those of at least the past 420,000 years during which most extant marine organisms evolved. Under conditions expected in the 21st century, global warming and ocean acidification will compromise carbonate accretion, with corals becoming increasingly rare on reef systems. The result will be less diverse reef communities and carbonate reef structures that fail to be maintained. Climate change also exacerbates local stresses from declining water quality and overexploitation of key species, driving reefs increasingly toward the tipping point for functional collapse. This review presents future scenarios for coral reefs that predict increasingly serious consequences for reef-associated fisheries, tourism, coastal protection, and people. As the International Year of the Reef 2008 begins, scaled-up management intervention and decisive action on global emissions are required if the loss of coral-dominated ecosystems is to be avoided.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hoegh-Guldberg, O -- Mumby, P J -- Hooten, A J -- Steneck, R S -- Greenfield, P -- Gomez, E -- Harvell, C D -- Sale, P F -- Edwards, A J -- Caldeira, K -- Knowlton, N -- Eakin, C M -- Iglesias-Prieto, R -- Muthiga, N -- Bradbury, R H -- Dubi, A -- Hatziolos, M E -- New York, N.Y. -- Science. 2007 Dec 14;318(5857):1737-42.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Centre for Marine Studies, University of Queensland, St. Lucia, 4072 Queensland, Australia. oveh@uq.edu.au〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18079392" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Anthozoa/growth & development/physiology ; Atmosphere ; Carbon Dioxide ; *Climate ; Dinoflagellida/physiology ; *Ecosystem ; Eukaryota/physiology ; Fishes ; Forecasting ; *Greenhouse Effect ; Hydrogen-Ion Concentration ; Oceans and Seas ; Seawater/*chemistry ; Temperature
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  • 26
    Publication Date: 2007-09-29
    Description: High-resolution chemostratigraphy reveals an episode of enrichment of the redox-sensitive transition metals molybdenum and rhenium in the late Archean Mount McRae Shale in Western Australia. Correlations with organic carbon indicate that these metals were derived from contemporaneous seawater. Rhenium/osmium geochronology demonstrates that the enrichment is a primary sedimentary feature dating to 2501 +/- 8 million years ago (Ma). Molybdenum and rhenium were probably supplied to Archean oceans by oxidative weathering of crustal sulfide minerals. These findings point to the presence of small amounts of O2 in the environment more than 50 million years before the start of the Great Oxidation Event.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Anbar, Ariel D -- Duan, Yun -- Lyons, Timothy W -- Arnold, Gail L -- Kendall, Brian -- Creaser, Robert A -- Kaufman, Alan J -- Gordon, Gwyneth W -- Scott, Clinton -- Garvin, Jessica -- Buick, Roger -- New York, N.Y. -- Science. 2007 Sep 28;317(5846):1903-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉School of Earth and Space Exploration, Arizona State University, Tempe, AZ 85287, USA. anbar@asu.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17901330" target="_blank"〉PubMed〈/a〉
    Keywords: Australia ; Geologic Sediments/*chemistry ; Isotopes/analysis ; Molybdenum/analysis ; Oceans and Seas ; Osmium/analysis ; Oxidation-Reduction ; *Oxygen/analysis ; Rhenium/analysis ; Seawater/chemistry ; Sulfur/analysis ; Sulfur Isotopes/analysis ; Temperature ; Uranium/analysis
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  • 27
    Publication Date: 2007-12-08
    Description: Chung et al. (Reports, 20 April 2007, p. 436) reported the synthesis of superhard rhenium diboride (ReB2) at ambient pressure. We show that ReB2, first synthesized at ambient pressure 45 years ago, is not a superhard material. Together with the high cost of Re, this makes the prospect for large-scale industrial applications of ReB2 doubtful.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Dubrovinskaia, Natalia -- Dubrovinsky, Leonid -- Solozhenko, Vladimir L -- New York, N.Y. -- Science. 2007 Dec 7;318(5856):1550; author reply 1550.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Mineralphysik und Strukturforschung, Mineralogisches Institut, Universitat Heidelberg, 69120 Heidelberg, Germany. natalia.dubrovinskaia@min.uni-heidelberg.de〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18063772" target="_blank"〉PubMed〈/a〉
    Keywords: Boron Compounds/chemical synthesis/*chemistry ; Compressive Strength ; Hardness ; Pressure ; Rhenium/*chemistry ; Temperature
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  • 28
    Publication Date: 2007-08-19
    Description: Aneuploidy is a condition frequently found in tumor cells, but its effect on cellular physiology is not known. We have characterized one aspect of aneuploidy: the gain of extra chromosomes. We created a collection of haploid yeast strains that each bear an extra copy of one or more of almost all of the yeast chromosomes. Their characterization revealed that aneuploid strains share a number of phenotypes, including defects in cell cycle progression, increased glucose uptake, and increased sensitivity to conditions interfering with protein synthesis and protein folding. These phenotypes were observed only in strains carrying additional yeast genes, which indicates that they reflect the consequences of additional protein production as well as the resulting imbalances in cellular protein composition. We conclude that aneuploidy causes not only a proliferative disadvantage but also a set of phenotypes that is independent of the identity of the individual extra chromosomes.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Torres, Eduardo M -- Sokolsky, Tanya -- Tucker, Cheryl M -- Chan, Leon Y -- Boselli, Monica -- Dunham, Maitreya J -- Amon, Angelika -- GM071508/GM/NIGMS NIH HHS/ -- GM56800/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2007 Aug 17;317(5840):916-24.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Center for Cancer Research, Howard Hughes Medical Institute, Massachusetts Institute of Technology, E17-233, 40 Ames Street, Cambridge, MA 02139, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17702937" target="_blank"〉PubMed〈/a〉
    Keywords: *Aneuploidy ; Cell Division ; *Cell Proliferation ; Chromosomes, Fungal/genetics ; G1 Phase ; Gene Expression Regulation, Fungal ; Genes, Fungal ; Glucose/metabolism ; Haploidy ; Phenotype ; Protein Synthesis Inhibitors/pharmacology ; Saccharomyces cerevisiae/cytology/*genetics/*physiology ; Saccharomyces cerevisiae Proteins/biosynthesis/metabolism ; Temperature ; Transcription, Genetic
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  • 29
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2007-05-05
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Pala, Christopher -- New York, N.Y. -- Science. 2007 May 4;316(5825):680-1.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17478694" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Anthozoa/physiology ; *Conservation of Natural Resources ; *Ecosystem ; Pacific Ocean ; Palau ; Temperature
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  • 30
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2007-12-15
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Pennisi, Elizabeth -- New York, N.Y. -- Science. 2007 Dec 14;318(5857):1712-7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18079377" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Anthozoa/growth & development/*physiology ; Biodiversity ; Cues ; *Ecosystem ; Eukaryota/physiology ; Larva/growth & development ; Reproduction ; Seasons ; Seawater ; Symbiosis ; Temperature
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  • 31
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2007-01-06
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wang, Tobias -- Overgaard, Johannes -- New York, N.Y. -- Science. 2007 Jan 5;315(5808):49-50.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Zoophysiology, Aarhus University, 8000 Aarhus, Denmark. tobias.wang@biology.au.dk〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17204631" target="_blank"〉PubMed〈/a〉
    Keywords: Acclimatization ; Aerobiosis ; Animals ; Cardiac Output ; *Ecosystem ; *Greenhouse Effect ; Heart/*physiology ; Oceans and Seas ; Oxygen/analysis/blood/*metabolism ; Oxygen Consumption ; Perciformes/*physiology ; Population Density ; Population Dynamics ; Seasons ; Seawater/chemistry ; Temperature
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  • 32
    Publication Date: 2007-07-14
    Description: The extreme toxicity of organomercury compounds that are found in the environment has focused attention on the mechanisms of action of bacterial remediating enzymes. We describe facile room-temperature protolytic cleavage by a thiol of the Hg-C bond in mercury-alkyl compounds that emulate the structure and function of the organomercurial lyase MerB. Specifically, the tris(2-mercapto-1-t-butylimidazolyl)hydroborato ligand [Tm(Bu(t))], which features three sulfur donors, has been used to synthesize [Tm(Bu(t))]HgR alkyl compounds (R = methyl or ethyl) that react with phenylthiol (PhSH) to yield [Tm(Bu(t))]HgSPh and RH. Although [Tm(Bu(t))]HgR compounds exist as linear two-coordinate complexes in the solid state, 1H nuclear magnetic resonance spectroscopy indicates that the complexes exist in rapid equilibrium with their higher-coordinate [kappa2-Tm(Bu(t))]HgR and [kappa3-Tm(Bu(t))]HgR isomers in solution. Facile access to a higher-coordinate species is proposed to account for the exceptional reactivity of [Tm(Bu(t))]HgR relative to that of other two-coordinate mercury-alkyl compounds.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Melnick, Jonathan G -- Parkin, Gerard -- GM046502/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2007 Jul 13;317(5835):225-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemistry, Columbia University, New York, NY 10027, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17626880" target="_blank"〉PubMed〈/a〉
    Keywords: Alkanes/chemistry/*metabolism ; Bacterial Proteins/chemistry/*metabolism ; Binding Sites ; Biodegradation, Environmental ; Cysteine/chemistry/metabolism ; Escherichia coli/*enzymology ; Ligands ; Lyases/chemistry/*metabolism ; Magnetic Resonance Spectroscopy ; Methylmercury Compounds/chemistry/*metabolism ; Models, Chemical ; Molecular Structure ; Organomercury Compounds/chemistry/*metabolism ; Sulfhydryl Compounds/*chemistry ; Sulfur/chemistry ; Temperature
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  • 33
    Publication Date: 2007-09-18
    Description: Microscopic sulfides with low 34S/32S ratios in marine sulfate deposits from the 3490-million-year old Dresser Formation, Australia, have been interpreted as evidence for the presence of early sulfate-reducing organisms on Earth. We show that these microscopic sulfides have a mass-independently fractionated sulfur isotopic anomaly (Delta33S) that differs from that of their host sulfate (barite). These microscopic sulfides could not have been produced by sulfate-reducing microbes, nor by abiologic processes that involve reduction of sulfate. Instead, we interpret the combined negative delta34S and positive Delta33S signature of these microscopic sulfides as evidence for the early existence of organisms that disproportionate elemental sulfur.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Philippot, Pascal -- Van Zuilen, Mark -- Lepot, Kevin -- Thomazo, Christophe -- Farquhar, James -- Van Kranendonk, Martin J -- New York, N.Y. -- Science. 2007 Sep 14;317(5844):1534-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Equipe Geobiosphere Actuelle et Primitive, Institut de Physique du Globe de Paris, CNRS and Universite Denis Diderot, 4 place Jussieu, 75005 Paris cedex, France. philippot@ipgp.jussieu.fr〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17872441" target="_blank"〉PubMed〈/a〉
    Keywords: Australia ; Barium Sulfate/chemistry ; Cold Climate ; Geologic Sediments/*chemistry/microbiology ; Hydrogen Sulfide/chemistry/metabolism ; Oxidation-Reduction ; Sulfates/chemistry/metabolism ; Sulfur/analysis/*metabolism ; Sulfur Isotopes/analysis ; Sulfur-Reducing Bacteria/*metabolism ; Temperature
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  • 34
    Publication Date: 2007-05-19
    Description: Mesoscale eddies may play a critical role in ocean biogeochemistry by increasing nutrient supply, primary production, and efficiency of the biological pump, that is, the ratio of carbon export to primary production in otherwise nutrient-deficient waters. We examined a diatom bloom within a cold-core cyclonic eddy off Hawaii. Eddy primary production, community biomass, and size composition were markedly enhanced but had little effect on the carbon export ratio. Instead, the system functioned as a selective silica pump. Strong trophic coupling and inefficient organic export may be general characteristics of community perturbation responses in the warm waters of the Pacific Ocean.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Benitez-Nelson, Claudia R -- Bidigare, Robert R -- Dickey, Tommy D -- Landry, Michael R -- Leonard, Carrie L -- Brown, Susan L -- Nencioli, Francesco -- Rii, Yoshimi M -- Maiti, Kanchan -- Becker, Jamie W -- Bibby, Thomas S -- Black, Wil -- Cai, Wei-Jun -- Carlson, Craig A -- Chen, Feizhou -- Kuwahara, Victor S -- Mahaffey, Claire -- McAndrew, Patricia M -- Quay, Paul D -- Rappe, Michael S -- Selph, Karen E -- Simmons, Melinda P -- Yang, Eun Jin -- New York, N.Y. -- Science. 2007 May 18;316(5827):1017-21.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Geological Sciences and Marine Science Program, University of South Carolina, Columbia, SC 29208, USA. cbnelson@geol.sc.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17510362" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Bacteria/growth & development ; Biomass ; Carbon/analysis ; Chlorophyll/analysis ; Diatoms/*growth & development/physiology ; *Ecosystem ; Hawaii ; Nitrates ; Nitrites/analysis ; Pacific Ocean ; Photosynthesis ; Phytoplankton/growth & development/physiology ; *Seawater/chemistry ; Silicic Acid/analysis ; Silicon Dioxide/*analysis ; Temperature ; *Water Movements ; Zooplankton/growth & development/physiology
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  • 35
    Publication Date: 2007-06-30
    Description: Drosophila melanogaster can make appropriate choices among alternative flight options on the basis of the relative salience of competing visual cues. We show that this choice behavior consists of early and late phases; the former requires activation of the dopaminergic system and mushroom bodies, whereas the latter is independent of these activities. Immunohistological analysis showed that mushroom bodies are densely innervated by dopaminergic axons. Thus, the circuit from the dopamine system to mushroom bodies is crucial for choice behavior in Drosophila.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Zhang, Ke -- Guo, Jian Zeng -- Peng, Yueqing -- Xi, Wang -- Guo, Aike -- New York, N.Y. -- Science. 2007 Jun 29;316(5833):1901-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute of Neuroscience, Key Laboratory of Neurobiology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences (CAS), 320 Yueyang Road, Shanghai 200031, China.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17600217" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Animals, Genetically Modified ; Axons/*physiology ; Behavior, Animal ; *Choice Behavior ; Cues ; Dopamine/*physiology ; Drosophila melanogaster/genetics/*physiology ; Female ; Immunohistochemistry ; Models, Animal ; Mushroom Bodies/*innervation/*physiology ; Mutation ; Temperature ; Time Factors
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  • 36
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2007-03-17
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Stokstad, Erik -- New York, N.Y. -- Science. 2007 Mar 16;315(5818):1522-3.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17363659" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antarctic Regions ; *Cold Climate ; *Ecosystem ; Food Chain ; *Ice Cover ; Nesting Behavior ; Population Dynamics ; Snow ; *Spheniscidae ; Temperature
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  • 37
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2007-12-15
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kennedy, Donald -- New York, N.Y. -- Science. 2007 Dec 14;318(5857):1695.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18079369" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Anthozoa ; *Conservation of Natural Resources/legislation & jurisprudence ; *Ecosystem ; Hydrogen-Ion Concentration ; Seawater ; Temperature ; United States
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  • 38
    Publication Date: 2007-04-07
    Description: Inositol pyrophosphates are a diverse group of high-energy signaling molecules whose cellular roles remain an active area of study. We report a previously uncharacterized class of inositol pyrophosphate synthase and find it is identical to yeast Vip1 and Asp1 proteins, regulators of actin-related protein-2/3 (ARP 2/3) complexes. Vip1 and Asp1 acted as enzymes that encode inositol hexakisphosphate (IP6) and inositol heptakisphosphate (IP7) kinase activities. Alterations in kinase activity led to defects in cell growth, morphology, and interactions with ARP complex members. The functionality of Asp1 and Vip1 may provide cells with increased signaling capacity through metabolism of IP6.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Mulugu, Sashidhar -- Bai, Wenli -- Fridy, Peter C -- Bastidas, Robert J -- Otto, James C -- Dollins, D Eric -- Haystead, Timothy A -- Ribeiro, Anthony A -- York, John D -- 2-P30-CA14236-3/CA/NCI NIH HHS/ -- P30-CA-14236/CA/NCI NIH HHS/ -- R01-HL-55672/HL/NHLBI NIH HHS/ -- R33-DK-070272/DK/NIDDK NIH HHS/ -- New York, N.Y. -- Science. 2007 Apr 6;316(5821):106-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute, Department of Pharmacology and Cancer Biology, Duke University Medical Center, DUMC 3813, Durham, NC 27710, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17412958" target="_blank"〉PubMed〈/a〉
    Keywords: Actin-Related Protein 3/metabolism ; Amino Acid Sequence ; Animals ; Catalytic Domain ; Chromatography, High Pressure Liquid ; Conserved Sequence ; Cytoskeletal Proteins/chemistry/genetics/isolation & purification/*metabolism ; Humans ; Inositol Phosphates/metabolism ; Molecular Sequence Data ; Phosphorylation ; Phosphotransferases (Phosphate Group Acceptor)/chemistry/genetics/isolation & ; purification/*metabolism ; Phytic Acid/*metabolism ; Protein Structure, Tertiary ; Recombinant Fusion Proteins/chemistry/isolation & purification/metabolism ; Saccharomyces cerevisiae/*enzymology/genetics ; Saccharomyces cerevisiae Proteins/chemistry/genetics/isolation & ; purification/metabolism ; Schizosaccharomyces/cytology/*enzymology/genetics/growth & development ; Schizosaccharomyces pombe Proteins/chemistry/genetics/isolation & ; purification/*metabolism ; *Sequence Alignment ; Substrate Specificity ; Temperature
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  • 39
    Publication Date: 2007-06-30
    Description: Circadian and other natural clock-like endogenous rhythms may have evolved to anticipate regular temporal changes in the environment. We report that a mutation in the circadian clock gene timeless in Drosophila melanogaster has arisen and spread by natural selection relatively recently in Europe. We found that, when introduced into different genetic backgrounds, natural and artificial alleles of the timeless gene affect the incidence of diapause in response to changes in light and temperature. The natural mutant allele alters an important life history trait that may enhance the fly's adaptation to seasonal conditions.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Tauber, Eran -- Zordan, Mauro -- Sandrelli, Federica -- Pegoraro, Mirko -- Osterwalder, Nicolo -- Breda, Carlo -- Daga, Andrea -- Selmin, Alessandro -- Monger, Karen -- Benna, Clara -- Rosato, Ezio -- Kyriacou, Charalambos P -- Costa, Rodolfo -- New York, N.Y. -- Science. 2007 Jun 29;316(5833):1895-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Genetics, University of Leicester, Leicester LE1 7RH, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17600215" target="_blank"〉PubMed〈/a〉
    Keywords: Alleles ; Amino Acid Sequence ; Animals ; Base Sequence ; Circadian Rhythm/genetics ; Drosophila Proteins/*genetics/physiology ; Drosophila melanogaster/*genetics/*physiology ; Europe ; Evolution, Molecular ; Female ; Geography ; Haplotypes ; Molecular Sequence Data ; Mutation ; *Photoperiod ; Phylogeny ; Polymorphism, Genetic ; Protein Isoforms/genetics/physiology ; Reproduction ; *Seasons ; *Selection, Genetic ; Temperature ; Transformation, Genetic
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  • 40
    Publication Date: 2007-07-28
    Description: NS3, an essential helicase for replication of hepatitis C virus, is a model enzyme for investigating helicase function. Using single-molecule fluorescence analysis, we showed that NS3 unwinds DNA in discrete steps of about three base pairs (bp). Dwell time analysis indicated that about three hidden steps are required before a 3-bp step is taken. Taking into account the available structural data, we propose a spring-loaded mechanism in which several steps of one nucleotide per adenosine triphosphate molecule accumulate tension on the protein-DNA complex, which is relieved periodically via a burst of 3-bp unwinding. NS3 appears to shelter the displaced strand during unwinding, and, upon encountering a barrier or after unwinding 〉18 bp, it snaps or slips backward rapidly and repeats unwinding many times in succession. Such repetitive unwinding behavior over a short stretch of duplex may help to keep secondary structures resolved during viral genome replication.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3565428/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3565428/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Myong, Sua -- Bruno, Michael M -- Pyle, Anna M -- Ha, Taekjip -- R01 GM060620/GM/NIGMS NIH HHS/ -- R01 GM065367/GM/NIGMS NIH HHS/ -- R01-GM060620/GM/NIGMS NIH HHS/ -- R01-GM065367/GM/NIGMS NIH HHS/ -- Howard Hughes Medical Institute/ -- New York, N.Y. -- Science. 2007 Jul 27;317(5837):513-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Physics Department, University of Illinois, 1110 West Green Street, Urbana, IL 61801, USA. smyong@uiuc.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17656723" target="_blank"〉PubMed〈/a〉
    Keywords: Adenosine Triphosphate/metabolism ; Base Pairing ; DNA/chemistry/*metabolism ; DNA Helicases/*metabolism ; Fluorescence Resonance Energy Transfer ; Hepacivirus/*enzymology ; Models, Biological ; Models, Molecular ; Nucleic Acid Conformation ; Temperature ; Viral Nonstructural Proteins/chemistry/*metabolism
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  • 41
    Publication Date: 2007-11-24
    Description: Short complementary B-form DNA oligomers, 6 to 20 base pairs in length, are found to exhibit nematic and columnar liquid crystal phases, even though such duplexes lack the shape anisotropy required for liquid crystal ordering. Structural study shows that these phases are produced by the end-to-end adhesion and consequent stacking of the duplex oligomers into polydisperse anisotropic rod-shaped aggregates, which can order into liquid crystals. Upon cooling mixed solutions of short DNA oligomers, in which only a small fraction of the DNA present is complementary, the duplex-forming oligomers phase-separate into liquid crystal droplets, leaving the unpaired single strands in isotropic solution. In a chemical environment where oligomer ligation is possible, such ordering and condensation would provide an autocatalytic link whereby complementarity promotes the extended polymerization of complementary oligomers.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Nakata, Michi -- Zanchetta, Giuliano -- Chapman, Brandon D -- Jones, Christopher D -- Cross, Julie O -- Pindak, Ronald -- Bellini, Tommaso -- Clark, Noel A -- New York, N.Y. -- Science. 2007 Nov 23;318(5854):1276-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physics and Liquid Crystal Materials Research Center, University of Colorado, Boulder, CO 80309-0390, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18033877" target="_blank"〉PubMed〈/a〉
    Keywords: Anisotropy ; Base Pairing ; Crystallization ; DNA/*chemistry ; Nucleic Acid Conformation ; Oligodeoxyribonucleotides/chemistry ; Phase Transition ; Temperature ; Thermodynamics ; X-Ray Diffraction
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  • 42
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2007-12-22
    Description: Ancient Mars had liquid water on its surface and a CO2-rich atmosphere. Despite the implication that massive carbonate deposits should have formed, these have not been detected. On the basis of fundamental chemical and physical principles, we propose that climatic conditions enabling the existence of liquid water were maintained by appreciable atmospheric concentrations of volcanically degassed SO2 and H2S. The geochemistry resulting from equilibration of this atmosphere with the hydrological cycle is shown to inhibit the formation of carbonates. We propose an early martian climate feedback involving SO2, much like that maintained by CO2 on Earth.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Halevy, Itay -- Zuber, Maria T -- Schrag, Daniel P -- New York, N.Y. -- Science. 2007 Dec 21;318(5858):1903-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA 02138, USA. ihalevy@fas.harvard.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18096802" target="_blank"〉PubMed〈/a〉
    Keywords: Atmosphere ; Carbon Dioxide/chemistry ; Carbonates/chemistry ; Chemical Precipitation ; Climate ; Extraterrestrial Environment ; Hydrogen Sulfide/chemistry ; *Mars ; Oxidation-Reduction ; Photolysis ; Sulfites/chemistry ; Sulfur Dioxide/*chemistry ; Temperature ; Water
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  • 43
    Publication Date: 2007-01-27
    Description: In the developing fly wing, secreted morphogens such as Decapentaplegic (Dpp) and Wingless (Wg) form gradients of concentration providing positional information. Dpp forms a longer-range gradient than Wg. To understand how the range is controlled, we measured the four key kinetic parameters governing morphogen spreading: the production rate, the effective diffusion coefficient, the degradation rate, and the immobile fraction. The four parameters had different values for Dpp versus Wg. In addition, Dynamin-dependent endocytosis was required for spreading of Dpp, but not Wg. Thus, the cellular mechanisms of Dpp and Wingless spreading are different: Dpp spreading requires endocytic, intracellular trafficking.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kicheva, Anna -- Pantazis, Periklis -- Bollenbach, Tobias -- Kalaidzidis, Yannis -- Bittig, Thomas -- Julicher, Frank -- Gonzalez-Gaitan, Marcos -- New York, N.Y. -- Science. 2007 Jan 26;315(5811):521-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Max Planck Institute of Molecular Cell Biology and Genetics, Pfotenhauer Strasse 108, 01307 Dresden, Germany.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17255514" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Animals, Genetically Modified ; Diffusion ; Drosophila Proteins/*metabolism ; Drosophila melanogaster/growth & development/*metabolism ; Endocytosis ; Fluorescence Recovery After Photobleaching ; Kinetics ; Mathematics ; Proto-Oncogene Proteins/*metabolism ; Recombinant Fusion Proteins/metabolism ; Temperature ; Wings, Animal/*growth & development/*metabolism ; Wnt1 Protein
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  • 44
    Publication Date: 2007-01-16
    Description: The bacterial endosymbiont of the deep-sea tube worm Riftia pachyptila has never been successfully cultivated outside its host. In the absence of cultivation data, we have taken a proteomic approach based on the metagenome sequence to study the metabolism of this peculiar microorganism in detail. As one result, we found that three major sulfide oxidation proteins constitute approximately 12% of the total cytosolic proteome, which highlights the essential role of these enzymes for the symbiont's energy metabolism. Unexpectedly, the symbiont uses the reductive tricarboxylic acid cycle in addition to the previously identified Calvin cycle for CO2 fixation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Markert, Stephanie -- Arndt, Cordelia -- Felbeck, Horst -- Becher, Dorte -- Sievert, Stefan M -- Hugler, Michael -- Albrecht, Dirk -- Robidart, Julie -- Bench, Shellie -- Feldman, Robert A -- Hecker, Michael -- Schweder, Thomas -- New York, N.Y. -- Science. 2007 Jan 12;315(5809):247-50.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute of Marine Biotechnology, Walther-Rathenau-Strasse 49, D-17489 Greifswald, Germany.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17218528" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Bacterial Proteins/analysis/*metabolism ; Carbon/metabolism ; Carbon Dioxide/metabolism ; Chemoautotrophic Growth ; Citric Acid Cycle ; Cytosol/metabolism ; *Ecosystem ; Energy Metabolism ; Gammaproteobacteria/enzymology/genetics/*metabolism ; Genome, Bacterial ; Hydrogen Sulfide/metabolism ; Hydrogen-Ion Concentration ; Metabolic Networks and Pathways ; Molecular Sequence Data ; Oxidation-Reduction ; Pacific Ocean ; Polychaeta/*microbiology ; Proteome ; *Proteomics ; Sulfur/metabolism ; *Symbiosis ; Temperature
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  • 45
    Publication Date: 2007-02-03
    Description: Femtosecond time-resolved infrared spectroscopy was used to study the formation of cyclobutane dimers in the all-thymine oligodeoxynucleotide (dT)18 by ultraviolet light at 272 nanometers. The appearance of marker bands in the time-resolved spectra indicates that the dimers are fully formed approximately 1 picosecond after ultraviolet excitation. The ultrafast appearance of this mutagenic photolesion points to an excited-state reaction that is approximately barrierless for bases that are properly oriented at the instant of light absorption. The low quantum yield of this photoreaction is proposed to result from infrequent conformational states in the unexcited polymer, revealing a strong link between conformation before light absorption and photodamage.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2792699/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2792699/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Schreier, Wolfgang J -- Schrader, Tobias E -- Koller, Florian O -- Gilch, Peter -- Crespo-Hernandez, Carlos E -- Swaminathan, Vijay N -- Carell, Thomas -- Zinth, Wolfgang -- Kohler, Bern -- GM064563/GM/NIGMS NIH HHS/ -- R01 GM064563-04/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2007 Feb 2;315(5812):625-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department fur Physik, Ludwig-Maximilians-Universitat, Oettingenstrasse 67, D-80538 Munchen, Germany.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17272716" target="_blank"〉PubMed〈/a〉
    Keywords: DNA/*chemistry ; DNA Damage ; Dimerization ; Kinetics ; Nucleic Acid Conformation ; Oligodeoxyribonucleotides/*chemistry ; Photons ; Pyrimidine Dimers/*chemistry ; Spectroscopy, Fourier Transform Infrared ; Temperature ; Ultraviolet Rays
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  • 46
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2007-05-15
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Atreya, Sushil -- New York, N.Y. -- Science. 2007 May 11;316(5826):843-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Atmospheric, Oceanic, and Space Sciences, University of Michigan, Ann Arbor, MI 48109, USA. atreya@umich.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17495161" target="_blank"〉PubMed〈/a〉
    Keywords: Atmosphere ; *Benzene ; Extraterrestrial Environment ; *Hydrocarbons ; *Nitriles ; Photochemistry ; *Saturn ; Spacecraft ; Temperature ; Ultraviolet Rays
    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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  • 47
    Publication Date: 2007-01-27
    Description: Marine biogenic dimethylsulfide (DMS) is the main natural source of tropospheric sulfur, which may play a key role in cloud formation and albedo over the remote ocean. Through a global data analysis, we found that DMS concentrations are highly positively correlated with the solar radiation dose in the upper mixed layer of the open ocean, irrespective of latitude, plankton biomass, or temperature. This is a necessary condition for the feasibility of a negative feedback in which light-attenuating DMS emissions are in turn driven by the light dose received by the pelagic ecosystem.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Vallina, Sergio M -- Simo, Rafel -- New York, N.Y. -- Science. 2007 Jan 26;315(5811):506-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institut de Ciencies del Mar (CSIC), Passeig Maritim de la Barceloneta 37-49, 08003 Barcelona, Catalonia, Spain. sergio.vallina@icm.csic.es〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17255509" target="_blank"〉PubMed〈/a〉
    Keywords: Atlantic Ocean ; Bermuda ; Biomass ; Climate ; *Ecosystem ; Geography ; Mediterranean Sea ; *Phytoplankton/metabolism ; Seasons ; *Seawater ; Sulfides/*analysis/metabolism ; *Sunlight ; Temperature ; Ultraviolet Rays
    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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