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  • Articles  (29)
  • Animals  (19)
  • Condensed Matter: Electronic Properties, etc.  (10)
  • Chemistry
  • 2010-2014  (29)
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  • Articles  (29)
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  • 1
    Publication Date: 2012-11-08
    Description: Author(s): Long Ma, G. F. Ji, Jia Dai, X. R. Lu, M. J. Eom, J. S. Kim, B. Normand, and Weiqiang Yu We use 75 As nuclear magnetic resonance to investigate the local electronic properties of Ba(Fe 1- x Ru x ) 2 As 2 ( x =0.23). We find two phase transitions: to antiferromagnetism at T N ≈60  K and to superconductivity at T C ≈15  K. Below T N , our data show that the system is fully magnetic, with a commensurate an... [Phys. Rev. Lett. 109, 197002] Published Wed Nov 07, 2012
    Keywords: Condensed Matter: Electronic Properties, etc.
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
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  • 2
    Publication Date: 2012-08-30
    Description: Author(s): R. G. Burkovsky, Yu. A. Bronwald, A. V. Filimonov, A. I. Rudskoy, D. Chernyshov, A. Bosak, J. Hlinka, X. Long, Z.-G. Ye, and S. B. Vakhrushev Complementary diffuse and inelastic synchrotron x-ray scattering measurements of lead zirconate-titanate single crystals with composition near the morphotropic phase boundary ( x =0.475) are reported. In the temperature range 293  K〈 T 〈400  K a highly anisotropic quasielastic diffuse scattering i... [Phys. Rev. Lett. 109, 097603] Published Wed Aug 29, 2012
    Keywords: Condensed Matter: Electronic Properties, etc.
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
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  • 3
    Publication Date: 2012-02-10
    Description: Author(s): C. Phatak, A. K. Petford-Long, and O. Heinonen Confined magnetic thin films are known to exhibit a variety of fascinating topological spin states such as Skyrmions, vortices, and antivortices. Such topological excitations are fundamentally important to our understanding of quantum critical phenomenon and related phase transitions. Here we report... [Phys. Rev. Lett. 108, 067205] Published Thu Feb 09, 2012
    Keywords: Condensed Matter: Electronic Properties, etc.
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
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  • 4
    Publication Date: 2014-04-23
    Description: Author(s): S. Langridge, G. M. Watson, D. Gibbs, J. J. Betouras, N. I. Gidopoulos, F. Pollmann, M. W. Long, C. Vettier, and G. H. Lander In the majority of magnetic systems the surface is required to order at the same temperature as the bulk. In the present Letter, we report a distinct and unexpected surface magnetic phase transition at a lower temperature than the Néel temperature. Employing grazing incidence x-ray resonant magnetic... [Phys. Rev. Lett. 112, 167201] Published Tue Apr 22, 2014
    Keywords: Condensed Matter: Electronic Properties, etc.
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
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  • 5
    Publication Date: 2010-10-26
    Description: In songbirds, the remarkable temporal precision of song is generated by a sparse sequence of bursts in the premotor nucleus HVC. To distinguish between two possible classes of models of neural sequence generation, we carried out intracellular recordings of HVC neurons in singing zebra finches (Taeniopygia guttata). We found that the subthreshold membrane potential is characterized by a large, rapid depolarization 5-10 ms before burst onset, consistent with a synaptically connected chain of neurons in HVC. We found no evidence for the slow membrane potential modulation predicted by models in which burst timing is controlled by subthreshold dynamics. Furthermore, bursts ride on an underlying depolarization of approximately 10-ms duration, probably the result of a regenerative calcium spike within HVC neurons that could facilitate the propagation of activity through a chain network with high temporal precision. Our results provide insight into the fundamental mechanisms by which neural circuits can generate complex sequential behaviours.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2998755/" 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/PMC2998755/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Long, Michael A -- Jin, Dezhe Z -- Fee, Michale S -- DC009280/DC/NIDCD NIH HHS/ -- MH067105/MH/NIMH NIH HHS/ -- R01 MH067105/MH/NIMH NIH HHS/ -- R01 MH067105-06/MH/NIMH NIH HHS/ -- R01 MH067105-07/MH/NIMH NIH HHS/ -- England -- Nature. 2010 Nov 18;468(7322):394-9. doi: 10.1038/nature09514. Epub 2010 Oct 24.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉McGovern Institute for Brain Research, Department of Brain and Cognitive Sciences, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20972420" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Calcium Channels, L-Type/metabolism ; Calcium Signaling/drug effects ; Finches/*physiology ; Male ; Membrane Potentials/drug effects ; *Models, Neurological ; Neural Pathways/drug effects/*physiology ; Neurons/drug effects/*metabolism ; Sleep/physiology ; Synapses/*metabolism ; Vocalization, Animal/physiology
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 6
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2010-12-18
    Description: To investigate the origin and evolution of essential genes, we identified and phenotyped 195 young protein-coding genes, which originated 3 to 35 million years ago in Drosophila. Knocking down expression with RNA interference showed that 30% of newly arisen genes are essential for viability. The proportion of genes that are essential is similar in every evolutionary age group that we examined. Under constitutive silencing of these young essential genes, lethality was high in the pupal stage and also found in the larval stages. Lethality was attributed to diverse cellular and developmental defects, such as organ formation and patterning defects. These data suggest that new genes frequently and rapidly evolve essential functions and participate in development.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Chen, Sidi -- Zhang, Yong E -- Long, Manyuan -- R01GM065429-01A1/GM/NIGMS NIH HHS/ -- R01GM078070-01A1/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2010 Dec 17;330(6011):1682-5. doi: 10.1126/science.1196380.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Ecology and Evolution, The University of Chicago, 1101 East 57th Street, Chicago, IL 60637, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21164016" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Substitution ; Animals ; Body Patterning/genetics ; Drosophila/classification/*genetics/growth & development ; Drosophila Proteins/chemistry/genetics/physiology ; Drosophila melanogaster/classification/*genetics/growth & development ; *Evolution, Molecular ; Gene Duplication ; Gene Expression Profiling ; Gene Expression Regulation, Developmental ; *Genes, Essential ; *Genes, Insect ; Larva/genetics/growth & development ; Metamorphosis, Biological ; Phenotype ; Phylogeny ; Pupa/genetics/growth & development ; RNA Interference ; Time Factors ; Wings, Animal/abnormalities/growth & development
    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
    Publication Date: 2011-10-25
    Description: 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 monoacylglycerol lipase (MAGL) hydrolyzes the endocannabinoid 2-arachidonoylglycerol to generate a major arachidonate precursor pool for neuroinflammatory prostaglandins. MAGL-disrupted animals show neuroprotection in a parkinsonian mouse model. These animals are spared the hemorrhaging caused by COX inhibitors in the gut, where prostaglandins are instead regulated by cytosolic PLA(2). These findings identify MAGL as a distinct metabolic node that couples endocannabinoid to prostaglandin signaling networks in the nervous system and suggest that inhibition of this enzyme may be a new and potentially safer way to suppress the proinflammatory cascades that underlie neurodegenerative disorders.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3249428/" 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/PMC3249428/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Nomura, Daniel K -- Morrison, Bradley E -- Blankman, Jacqueline L -- Long, Jonathan Z -- Kinsey, Steven G -- Marcondes, Maria Cecilia G -- Ward, Anna M -- Hahn, Yun Kyung -- Lichtman, Aron H -- Conti, Bruno -- Cravatt, Benjamin F -- 5P01DA009789/DA/NIDA NIH HHS/ -- AG028040/AG/NIA NIH HHS/ -- DA017259/DA/NIDA NIH HHS/ -- DA026261/DA/NIDA NIH HHS/ -- F31 DA026261-03/DA/NIDA NIH HHS/ -- K99 DA030908/DA/NIDA NIH HHS/ -- K99 DA030908-01/DA/NIDA NIH HHS/ -- K99DA030908/DA/NIDA NIH HHS/ -- P01 DA009789/DA/NIDA NIH HHS/ -- P01 DA009789-14/DA/NIDA NIH HHS/ -- P01 DA017259/DA/NIDA NIH HHS/ -- P01 DA017259-08/DA/NIDA NIH HHS/ -- P01DA01725/DA/NIDA NIH HHS/ -- R00 DA030908/DA/NIDA NIH HHS/ -- R00 DA030908-02/DA/NIDA NIH HHS/ -- R00DA030908/DA/NIDA NIH HHS/ -- R01 AG028040/AG/NIA NIH HHS/ -- R01 AG028040-04/AG/NIA NIH HHS/ -- R03 DA027936/DA/NIDA NIH HHS/ -- R03 DA027936-02/DA/NIDA NIH HHS/ -- R03DA027936/DA/NIDA NIH HHS/ -- T32 DA007027/DA/NIDA NIH HHS/ -- T32 DA007027-33/DA/NIDA NIH HHS/ -- T32DA007027/DA/NIDA NIH HHS/ -- New York, N.Y. -- Science. 2011 Nov 11;334(6057):809-13. doi: 10.1126/science.1209200. Epub 2011 Oct 20.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉The Skaggs Institute for Chemical Biology and Department of Chemical Physiology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA. dnomura@berkeley.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22021672" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Arachidonic Acid/metabolism ; Arachidonic Acids/*metabolism ; Benzodioxoles/pharmacology ; Brain/drug effects/*metabolism/pathology ; Cannabinoid Receptor Modulators/*metabolism ; Cyclooxygenase 1/metabolism ; Cytokines/metabolism ; Eicosanoids/metabolism ; *Endocannabinoids ; Enzyme Inhibitors/pharmacology ; Glycerides/*metabolism ; Hydrolysis ; Inflammation/*metabolism/pathology ; Inflammation Mediators/pharmacology ; Lipopolysaccharides/pharmacology ; Liver/metabolism ; Lung/metabolism ; Metabolomics ; Mice ; Mice, Inbred C57BL ; Monoacylglycerol Lipases/antagonists & inhibitors/genetics/*metabolism ; Neuroprotective Agents/pharmacology ; Parkinsonian Disorders/metabolism/pathology ; Phospholipases A2/genetics/metabolism ; Piperidines/pharmacology ; Prostaglandins/biosynthesis/*metabolism ; Signal Transduction
    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
    Publication Date: 2011-07-02
    Description: DNA interstrand cross-links (ICLs) are toxic DNA lesions whose repair in S phase of eukaryotic cells is incompletely understood. In Xenopus egg extracts, ICL repair is initiated when two replication forks converge on the lesion. Dual incisions then create a DNA double-strand break (DSB) in one sister chromatid, whereas lesion bypass restores the other sister. We report that the broken sister chromatid is repaired via RAD51-dependent strand invasion into the regenerated sister. Recombination acts downstream of FANCI-FANCD2, yet RAD51 binds ICL-stalled replication forks independently of FANCI-FANCD2 and before DSB formation. Our results elucidate the functional link between the Fanconi anemia pathway and the recombination machinery during ICL repair. In addition, they demonstrate the complete repair of a DSB via homologous recombination in vitro.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4068331/" 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/PMC4068331/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Long, David T -- Raschle, Markus -- Joukov, Vladimir -- Walter, Johannes C -- GM80676/GM/NIGMS NIH HHS/ -- HL098316/HL/NHLBI NIH HHS/ -- R01 HL098316/HL/NHLBI NIH HHS/ -- New York, N.Y. -- Science. 2011 Jul 1;333(6038):84-7. doi: 10.1126/science.1204258.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, MA 02115, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21719678" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Chromatids/metabolism ; DNA/*metabolism ; *DNA Breaks, Double-Stranded ; *DNA Repair ; DNA Replication ; Fanconi Anemia Complementation Group D2 Protein/genetics/metabolism ; Fanconi Anemia Complementation Group Proteins/metabolism ; Protein Binding ; Rad51 Recombinase/*metabolism ; Recombinant Proteins/metabolism ; Recombination, Genetic ; Replication Protein A/metabolism ; Xenopus Proteins/*metabolism ; Xenopus laevis
    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
    Publication Date: 2011-08-20
    Description: Immune clearance and resource limitation (via red blood cell depletion) shape the peaks and troughs of malaria parasitemia, which in turn affect disease severity and transmission. Quantitatively partitioning the relative roles of these effects through time is challenging. Using data from rodent malaria, we estimated the effective propagation number, which reflects the relative importance of contrasting within-host control mechanisms through time and is sensitive to the inoculating parasite dose. Our analysis showed that the capacity of innate responses to restrict initial parasite growth saturates with parasite dose and that experimentally enhanced innate immunity can affect parasite density indirectly via resource depletion. Such a statistical approach offers a tool to improve targeting of drugs or vaccines for human therapy by revealing the dynamics and interactions of within-host regulatory mechanisms.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3891600/" 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/PMC3891600/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Metcalf, C J E -- Graham, A L -- Huijben, S -- Barclay, V C -- Long, G H -- Grenfell, B T -- Read, A F -- Bjornstad, O N -- R01 GM089932/GM/NIGMS NIH HHS/ -- R01GM089932/GM/NIGMS NIH HHS/ -- R24 HD047879/HD/NICHD NIH HHS/ -- Biotechnology and Biological Sciences Research Council/United Kingdom -- Wellcome Trust/United Kingdom -- New York, N.Y. -- Science. 2011 Aug 19;333(6045):984-8. doi: 10.1126/science.1204588.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Zoology, Oxford University, Oxford OX1 3PS, UK. charlotte.metcalf@zoo.ox.ac.uk〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21852493" target="_blank"〉PubMed〈/a〉
    Keywords: Adaptive Immunity ; Animals ; Antibodies/immunology ; CD4-Positive T-Lymphocytes/immunology ; Erythrocyte Aging ; Erythrocyte Count ; Erythrocytes/*parasitology/physiology ; Host-Parasite Interactions ; Humans ; Immunity, Innate ; Interleukin-10/immunology/metabolism ; Malaria/blood/*immunology/*parasitology ; Mice ; Models, Biological ; Models, Statistical ; *Parasitemia/blood/immunology/parasitology ; Plasmodium chabaudi/immunology/*physiology ; Receptors, Interleukin-10/immunology ; Regression Analysis
    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
    Publication Date: 2012-11-28
    Description: The plasma membrane protein Orai forms the pore of the calcium release-activated calcium (CRAC) channel and generates sustained cytosolic calcium signals when triggered by depletion of calcium from the endoplasmic reticulum. The crystal structure of Orai from Drosophila melanogaster, determined at 3.35 angstrom resolution, reveals that the calcium channel is composed of a hexameric assembly of Orai subunits arranged around a central ion pore. The pore traverses the membrane and extends into the cytosol. A ring of glutamate residues on its extracellular side forms the selectivity filter. A basic region near the intracellular side can bind anions that may stabilize the closed state. The architecture of the channel differs markedly from other ion channels and gives insight into the principles of selective calcium permeation and gating.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3695727/" 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/PMC3695727/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hou, Xiaowei -- Pedi, Leanne -- Diver, Melinda M -- Long, Stephen B -- GM094273/GM/NIGMS NIH HHS/ -- P30 CA008748/CA/NCI NIH HHS/ -- R01 GM094273/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2012 Dec 7;338(6112):1308-13. doi: 10.1126/science.1228757. Epub 2012 Nov 22.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Structural Biology Program, Memorial Sloan-Kettering Cancer Center, 1275 York Avenue, New York, NY 10065, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23180775" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Binding Sites ; Calcium/*chemistry ; Calcium Channels/*chemistry ; Crystallography, X-Ray ; Drosophila Proteins/agonists/*chemistry ; Glutamic Acid/chemistry ; Membrane Proteins/agonists/*chemistry ; Porosity ; Protein Binding ; Protein Structure, Secondary ; Protein Structure, Tertiary
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    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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