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  • 1
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    Protein kinase C overactivity impairs prefrontal cortical regulation of working memory (2004)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2004-10-30
    Description: The prefrontal cortex is a higher brain region that regulates thought, behavior, and emotion using representational knowledge, operations often referred to as working memory. We tested the influence of protein kinase C (PKC) intracellular signaling on prefrontal cortical cognitive function and showed that high levels of PKC activity in prefrontal cortex, as seen for example during stress exposure, markedly impair behavioral and electrophysiological measures of working memory. These data suggest that excessive PKC activation can disrupt prefrontal cortical regulation of behavior and thought, possibly contributing to signs of prefrontal cortical dysfunction such as distractibility, impaired judgment, impulsivity, and thought disorder.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Birnbaum, S G -- Yuan, P X -- Wang, M -- Vijayraghavan, S -- Bloom, A K -- Davis, D J -- Gobeske, K T -- Sweatt, J D -- Manji, H K -- Arnsten, A F T -- AG06036/AG/NIA NIH HHS/ -- P50 MH068789/MH/NIMH NIH HHS/ -- New York, N.Y. -- Science. 2004 Oct 29;306(5697):882-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Neurobiology, Yale Medical School, 333 Cedar Street, New Haven, CT 06520-8001, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15514161" target="_blank"〉PubMed〈/a〉
    Keywords: Adrenergic alpha-Agonists/pharmacology ; Alkaloids ; Animals ; Benzophenanthridines ; Carbolines/pharmacology ; Electrophysiology ; Enzyme Activation ; Female ; Imidazoles/pharmacology ; Lithium Carbonate/pharmacology ; Macaca mulatta ; Male ; Memory/drug effects/*physiology ; Neurons/drug effects/physiology ; Phenanthridines/pharmacology ; Prefrontal Cortex/enzymology/*physiology ; Protein Kinase C/antagonists & inhibitors/*metabolism ; Rats ; Rats, Sprague-Dawley ; Receptors, Adrenergic, alpha-1/physiology ; Signal Transduction ; Stress, Physiological/physiopathology ; Tetradecanoylphorbol Acetate/pharmacology ; Valproic Acid/pharmacology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 2
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    Null model trumps accusations of bias (2004)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2004-12-14
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Davis, Mark A -- New York, N.Y. -- Science. 2004 Dec 10;306(5703):1891.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15591186" target="_blank"〉PubMed〈/a〉
    Keywords: *Awards and Prizes ; Female ; Humans ; Male ; Men ; *National Institutes of Health (U.S.) ; *Prejudice ; United States ; *Women
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 3
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    Lost at sea: where is all the plastic? (2004)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2004-05-08
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Thompson, Richard C -- Olsen, Ylva -- Mitchell, Richard P -- Davis, Anthony -- Rowland, Steven J -- John, Anthony W G -- McGonigle, Daniel -- Russell, Andrea E -- New York, N.Y. -- Science. 2004 May 7;304(5672):838.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉University of Plymouth, PL4 8AA, UK. rcthompson@plymouth.ac.uk〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15131299" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 4
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    Macroscopic, neat, single-walled carbon nanotube fibers (2004)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2004-09-09
    Description: Well-aligned macroscopic fibers composed solely of single-walled carbon nanotubes (SWNTs) were produced by conventional spinning. Fuming sulfuric acid charges SWNTs and promotes their ordering into an aligned phase of individual mobile SWNTs surrounded by acid anions. This ordered dispersion was extruded via solution spinning into continuous lengths of macroscopic neat SWNT fibers. Such fibers possess interesting structural composition and physical properties.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ericson, Lars M -- Fan, Hua -- Peng, Haiqing -- Davis, Virginia A -- Zhou, Wei -- Sulpizio, Joseph -- Wang, Yuhuang -- Booker, Richard -- Vavro, Juraj -- Guthy, Csaba -- Parra-Vasquez, A Nicholas G -- Kim, Myung Jong -- Ramesh, Sivarajan -- Saini, Rajesh K -- Kittrell, Carter -- Lavin, Gerry -- Schmidt, Howard -- Adams, W Wade -- Billups, W E -- Pasquali, Matteo -- Hwang, Wen-Fang -- Hauge, Robert H -- Fischer, John E -- Smalley, Richard E -- New York, N.Y. -- Science. 2004 Sep 3;305(5689):1447-50.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Center for Nanoscale Science and Technology, Rice University, Houston, TX 77005, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15353797" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 5
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    What can progeroid syndromes tell us about human aging? (2004)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2004-09-09
    Description: Human genetic diseases that resemble accelerated aging provide useful models for gerontologists. They combine known single-gene mutations with deficits in selected tissues that are reminiscent of changes seen during normal aging. Here, we describe recent progress toward linking molecular and cellular changes with the phenotype seen in two of these disorders. One in particular, Werner syndrome, provides evidence to support the hypothesis that the senescence of somatic cells may be a causal agent of normal aging.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kipling, David -- Davis, Terence -- Ostler, Elizabeth L -- Faragher, Richard G A -- New York, N.Y. -- Science. 2004 Sep 3;305(5689):1426-31.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Pathology, School of Medicine, Cardiff University, Heath Park, Cardiff CF14 4XN, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15353794" target="_blank"〉PubMed〈/a〉
    Keywords: *Aging ; Animals ; Cell Aging ; Cell Division ; DNA Helicases/genetics/physiology ; Exodeoxyribonucleases ; Female ; Gene Expression ; Humans ; Male ; Mice ; Models, Animal ; Mutation ; Phenotype ; RecQ Helicases ; Telomere/metabolism ; *Werner Syndrome/genetics/pathology/physiopathology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 6
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    Robotic observations of enhanced carbon biomass and export at 55 degrees during SOFeX (2004)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2004-04-17
    Description: Autonomous floats profiling in high-nitrate low-silicate waters of the Southern Ocean observed carbon biomass variability and carbon exported to depths of 100 m during the 2002 Southern Ocean Iron Experiment (SOFeX) to detect the effects of iron fertilization of surface water there. Control and "in-patch" measurements documented a greater than fourfold enhancement of carbon biomass in the iron-amended waters. Carbon export through 100 m increased two- to sixfold as the patch subducted below a front. The molar ratio of iron added to carbon exported ranged between 10(4) and 10(5). The biomass buildup and export were much higher than expected for iron-amended low-silicate waters.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Bishop, James K B -- Wood, Todd J -- Davis, Russ E -- Sherman, Jeffrey T -- New York, N.Y. -- Science. 2004 Apr 16;304(5669):417-20.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Earth Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, MS 90-1116, Berkeley, CA 94720, USA. JKBishop@lbl.gov〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15087544" target="_blank"〉PubMed〈/a〉
    Keywords: *Biomass ; Carbon/*analysis/metabolism ; *Iron/metabolism ; Oceans and Seas ; Phytoplankton/*growth & development/metabolism ; Robotics ; *Seawater/chemistry ; Temperature
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 7
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    Biochemistry. Mimicking posttranslational modifications of proteins (2004)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2004-01-24
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Davis, Benjamin G -- New York, N.Y. -- Science. 2004 Jan 23;303(5657):480-2.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Dyson Perrins Laboratory, Department of Chemistry, University of Oxford, Oxford OX1 3QY, UK. ben.davis@chemistry.oxford.ac.uk〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/14739446" target="_blank"〉PubMed〈/a〉
    Keywords: Biochemistry/*methods ; Drug Design ; Erythropoietin/chemistry/metabolism ; Glycosylation ; *Molecular Mimicry ; Molecular Structure ; Phosphorylation ; *Protein Processing, Post-Translational ; Recombinant Proteins/chemistry/metabolism ; ras Proteins/chemistry/metabolism
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 8
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    Host-to-parasite gene transfer in flowering plants: phylogenetic evidence from Malpighiales (2004)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2004-07-17
    Description: Horizontal gene transfer (HGT) between sexually unrelated species has recently been documented for higher plants, but mechanistic explanations for HGTs have remained speculative. We show that a parasitic relationship may facilitate HGT between flowering plants. The endophytic parasites Rafflesiaceae are placed in the diverse order Malpighiales. Our multigene phylogenetic analyses of Malpighiales show that mitochondrial (matR) and nuclear loci (18S ribosomal DNA and PHYC) place Rafflesiaceae in Malpighiales, perhaps near Ochnaceae/Clusiaceae. Mitochondrial nad1B-C, however, groups them within Vitaceae, near their obligate host Tetrastigma. These discordant phylogenetic hypotheses strongly suggest that part of the mitochondrial genome in Rafflesiaceae was acquired via HGT from their hosts.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Davis, Charles C -- Wurdack, Kenneth J -- New York, N.Y. -- Science. 2004 Jul 30;305(5684):676-8. Epub 2004 Jul 15.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Ecology and Evolutionary Biology, University of Michigan Herbarium, 3600 Varsity Drive, Ann Arbor, MI 48108-2287, USA. chdavis@umich.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15256617" target="_blank"〉PubMed〈/a〉
    Keywords: Angiosperms/*classification/*genetics ; Cell Nucleus/genetics ; DNA, Mitochondrial/genetics ; Flowers ; *Gene Transfer, Horizontal ; Genes, Plant ; Mitochondria/genetics ; Mitochondrial Proteins/genetics ; Phylogeny ; Plant Proteins/genetics ; Vitaceae/*classification/*genetics/parasitology
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  • 9
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    Predictive thresholds for plague in Kazakhstan (2004)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2004-05-01
    Description: In Kazakhstan and elsewhere in central Asia, the bacterium Yersinia pestis circulates in natural populations of gerbils, which are the source of human cases of bubonic plague. Our analysis of field data collected between 1955 and 1996 shows that plague invades, fades out, and reinvades in response to fluctuations in the abundance of its main reservoir host, the great gerbil (Rhombomys opimus). This is a rare empirical example of the two types of abundance thresholds for infectious disease-invasion and persistence- operating in a single wildlife population. We parameterized predictive models that should reduce the costs of plague surveillance in central Asia and thereby encourage its continuance.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Davis, Stephen -- Begon, Mike -- De Bruyn, Luc -- Ageyev, Vladimir S -- Klassovskiy, Nikolay L -- Pole, Sergey B -- Viljugrein, Hildegunn -- Stenseth, Nils Chr -- Leirs, Herwig -- New York, N.Y. -- Science. 2004 Apr 30;304(5671):736-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Danish Pest Infestation Laboratory, Skovbrynet 14, DK-2800 Kongens Lyngby, Denmark.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15118163" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Animals, Wild/microbiology ; *Disease Outbreaks/veterinary ; *Disease Reservoirs ; *Gerbillinae/microbiology ; Humans ; Insect Vectors/microbiology ; Kazakhstan/epidemiology ; Likelihood Functions ; Models, Statistical ; Nonlinear Dynamics ; Plague/*epidemiology/prevention & control/transmission/*veterinary ; Population Density ; Population Surveillance ; Rodent Diseases/*epidemiology ; Siphonaptera/microbiology ; Yersinia pestis/isolation & purification
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 10
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    Structural basis of transcription: an RNA polymerase II-TFIIB cocrystal at 4.5 Angstroms (2004)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2004-02-14
    Description: The structure of the general transcription factor IIB (TFIIB) in a complex with RNA polymerase II reveals three features crucial for transcription initiation: an N-terminal zinc ribbon domain of TFIIB that contacts the "dock" domain of the polymerase, near the path of RNA exit from a transcribing enzyme; a "finger" domain of TFIIB that is inserted into the polymerase active center; and a C-terminal domain, whose interaction with both the polymerase and with a TATA box-binding protein (TBP)-promoter DNA complex orients the DNA for unwinding and transcription. TFIIB stabilizes an early initiation complex, containing an incomplete RNA-DNA hybrid region. It may interact with the template strand, which sets the location of the transcription start site, and may interfere with RNA exit, which leads to abortive initiation or promoter escape. The trajectory of promoter DNA determined by the C-terminal domain of TFIIB traverses sites of interaction with TFIIE, TFIIF, and TFIIH, serving to define their roles in the transcription initiation process.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Bushnell, David A -- Westover, Kenneth D -- Davis, Ralph E -- Kornberg, Roger D -- AI21144/AI/NIAID NIH HHS/ -- GM49985/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2004 Feb 13;303(5660):983-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Structural Biology, Stanford University School of Medicine, Stanford, CA 94305-5126, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/14963322" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Binding Sites ; Crystallization ; Crystallography, X-Ray ; DNA/chemistry/metabolism ; Models, Molecular ; Molecular Sequence Data ; Nuclear Magnetic Resonance, Biomolecular ; Nucleic Acid Hybridization ; Promoter Regions, Genetic ; Protein Conformation ; Protein Structure, Secondary ; Protein Structure, Tertiary ; RNA/chemistry/metabolism ; RNA Polymerase II/*chemistry/metabolism ; Saccharomyces cerevisiae Proteins/chemistry/metabolism ; TATA Box ; TATA-Box Binding Protein/chemistry/metabolism ; Templates, Genetic ; Transcription Factor TFIIB/*chemistry/metabolism ; Transcription Factors, TFII/chemistry/metabolism ; *Transcription, Genetic ; Zinc/chemistry
    Print ISSN: 0036-8075
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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