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文章名     作者     期刊名     摘要     卷     期         如果没有找到您所需要的文献，请点击 ——此处申请     共53条记录   N-2 Reduction and Hydrogenation to Ammonia by a Molecular Iron-Potassium Complex [作者：Rodriguez, MM; Bill, E; Brennessel, WW; Holland, PL,期刊：Science, 页码：780-783 , 文章类型： Article，,卷期：2011年334-6057] The most common catalyst in the Haber-Bosch process for the hydrogenation of dinitrogen (N-2) to ammonia (NH3) is an iron surface promoted with potassium cations (K+), but soluble iron complexes have neither reduced the ... Lithospheric Thinning Beneath Rifted Regions of Southern California [作者：Lekic, V; French, SW; Fischer, KM,期刊：Science, 页码：783-787 , 文章类型： Article，,卷期：2011年334-6057] The stretching and break-up of tectonic plates by rifting control the evolution of continents and oceans, but the processes by which lithosphere deforms and accommodates strain during rifting remain enigmatic. Using scat... Forecasting Fire Season Severity in South America Using Sea Surface Temperature Anomalies [作者：Chen, Y; Randerson, JT; Morton, DC; DeFries, RS; Collatz, GJ; Kasibhatla, PS; Giglio, L; Jin, YF; Marlier, ME,期刊：Science, 页码：787-791 , 文章类型： Article，,卷期：2011年334-6057] Fires in South America cause forest degradation and contribute to carbon emissions associated with land use change. We investigated the relationship between year-to-year changes in fire activity in South America and sea ... Phase Transition of FeO and Stratification in Earth's Outer Core [作者：Ozawa, H; Takahashi, F; Hirose, K; Ohishi, Y; Hirao, N,期刊：Science, 页码：792-794 , 文章类型： Article，,卷期：2011年334-6057] Light elements such as oxygen in Earth's core influence the physical properties of the iron alloys that exist in this region. Describing the high-pressure behavior of these materials at core conditions constrains models ... Aerosol Indirect Effect on Biogeochemical Cycles and Climate [作者：Mahowald, N,期刊：Science, 页码：794-796 , 文章类型： Article，,卷期：2011年334-6057] The net effect of anthropogenic aerosols on climate is usually considered the sum of the direct radiative effect of anthropogenic aerosols, plus the indirect effect of these aerosols through aerosol-cloud interactions. H... Recent Synchronous Radiation of a Living Fossil [作者：Nagalingum, NS; Marshall, CR; Quental, TB; Rai, HS; Little, DP; Mathews, S,期刊：Science, 页码：796-799 , 文章类型： Article，,卷期：2011年334-6057] Modern survivors of previously more diverse lineages are regarded as living fossils, particularly when characterized by morphological stasis. Cycads are often cited as a classic example, reaching their greatest diversity... Global DNA Demethylation During Mouse Erythropoiesis in Vivo [作者：Shearstone, JR; Pop, R; Bock, C; Boyle, P; Meissner, A; Socolovsky, M,期刊：Science, 页码：799-802 , 文章类型： Article，,卷期：2011年334-6057] In the mammalian genome, 5'-CpG-3' dinucleotides are frequently methylated, correlating with transcriptional silencing. Genome-wide demethylation is thought to occur only twice during development, in primordial germ cell... Influence of Inositol Pyrophosphates on Cellular Energy Dynamics [作者：Szijgyarto, Z; Garedew, A; Azevedo, C; Saiardi, A,期刊：Science, 页码：802-805 , 文章类型： Article，,卷期：2011年334-6057] With its high-energy phosphate bonds, adenosine triphosphate (ATP) is the main intracellular energy carrier. It also functions in most signaling pathways, as a phosphate donor or a precursor for cyclic adenosine monophos... Sirt5 Is a NAD-Dependent Protein Lysine Demalonylase and Desuccinylase [作者：Du, JT; Zhou, YY; Su, XY; Yu, JJ; Khan, S; Jiang, H; Kim, J; Woo, J; Kim, JH; Choi, BH; He, B; Chen, W; Zhang, S; Cerione, RA; Auwerx, J; Hao, Q; Lin, HN,期刊：Science, 页码：806-809 , 文章类型： Article，,卷期：2011年334-6057] Silent information regulator 2 (Sir2) proteins (sirtuins) are nicotinamide adenine dinucleotide-dependent deacetylases that regulate important biological processes. Mammals have seven sirtuins, Sirt1 to Sirt7. Four of th... Endocannabinoid Hydrolysis Generates Brain Prostaglandins That Promote Neuroinflammation [作者：Nomura, DK; Morrison, BE; Blankman, JL; Long, JZ; Kinsey, SG; Marcondes, MCG; Ward, AM; Hahn, YK; Lichtman, AH; Conti, B; Cravatt, BF,期刊：Science, 页码：809-813 , 文章类型： Article，,卷期：2011年334-6057] Phospholipase A(2)(PLA(2)) enzymes are considered the primary source of arachidonic acid for cyclooxygenase (COX)-mediated biosynthesis of prostaglandins. Here, we show that a distinct pathway exists in brain, where mono... Failure to Confirm XMRV/MLVs in the Blood of Patients with Chronic Fatigue Syndrome: A Multi-Laboratory Study [作者：Simmons, G; Glynn, SA; Komaroff, AL; Mikovits, JA; Tobler, LH; Hackett, J; Tang, N; Switzer, WM; Heneine, W; Hewlett, IK; Zhao, JQ; Lo, SC; Alter, HJ; Linnen, JM; Gao, K; Coffin, JM; Kearney, MF; Ruscetti, FW; Pfost, MA; Bethel, J; Kleinman, S; Holmberg, JA; Busch, MP,期刊：Science, 页码：814-817 , 文章类型： Article，,卷期：2011年334-6057] Murine leukemia viruses (MLVs), including xenotropic-MLV-related virus (XMRV), have been controversially linked to chronic fatigue syndrome (CFS). To explore this issue in greater depth, we compiled coded replicate sampl... tRNAs Marked with CCACCA Are Targeted for Degradation [作者：Wilusz, JE; Whipple, JM; Phizicky, EM; Sharp, PA,期刊：Science, 页码：817-821 , 文章类型： Article，,卷期：2011年334-6057] The CCA-adding enzyme [ATP(CTP): tRNA nucleotidyltransferase] adds CCA to the 3' ends of transfer RNAs (tRNAs), a critical step in tRNA biogenesis that generates the amino acid attachment site. We found that the CCA-addi... A Burkholderia pseudomallei Toxin Inhibits Helicase Activity of Translation Factor eIF4A [作者：Cruz-Migoni, A; Hautbergue, GM; Artymiuk, PJ; Baker, PJ; Bokori-Brown, M; Chang, CT; Dickman, MJ; Essex-Lopresti, A; Harding, SV; Mahadi, NM; Marshall, LE; Mobbs, GW; Mohamed, R; Nathan, S; Ngugi, SA; Ong, C; Ooi, WF; Partridge, LJ; Phillips, HL; Raih, MF; Ruzheinikov, S; Sarkar-Tyson, M; Sedelnikova, SE; Smither, SJ; Tan, P; Titball, RW; Wilson, SA; Rice, DW,期刊：Science, 页码：821-824 , 文章类型： Article，,卷期：2011年334-6057] The structure of BPSL1549, a protein of unknown function from Burkholderia pseudomallei, reveals a similarity to Escherichia coli cytotoxic necrotizing factor 1. We found that BPSL1549 acted as a potent cytotoxin against... Late Interleukin-6 Escalates T Follicular Helper Cell Responses and Controls a Chronic Viral Infection [作者：Harker, JA; Lewis, GM; Mack, L; Zuniga, EI,期刊：Science, 页码：825-829 , 文章类型： Article，,卷期：2011年334-6057] Multiple inhibitory molecules create a profoundly immunuosuppressive environment during chronic viral infections in humans and mice. Therefore, eliciting effective immunity in this context represents a challenge. Here, w... Attention But Not Awareness Modulates the BOLD Signal in the Human V1 During Binocular Suppression [作者：Watanabe, M; Cheng, K; Murayama, Y; Ueno, K; Asamizuya, T; Tanaka, K; Logothetis, N,期刊：Science, 页码：829-831 , 文章类型： Article，,卷期：2011年334-6057] Although recent psychophysical studies indicate that visual awareness and top-down attention are two distinct processes, it is not clear how they are neurally dissociated in the visual system. Using a two-by-two factoria... Knocking on Heaven's Door How Physics and Scientific Thinking Illuminate the Universe and the Modern World [作者：Shermer, M,期刊：Science, 页码：762-763 , 文章类型： Book Review，,卷期：2011年334-6057]