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  • Signal Transduction  (90)
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  • American Association for the Advancement of Science (AAAS)  (277)
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  • 1
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    Evolution. Climb every mountain? (2003)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2003-12-20
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Elena, Santiago F -- Sanjuan, Rafael -- New York, N.Y. -- Science. 2003 Dec 19;302(5653):2074-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Instituto de Biologia Molecular y Celular de Plantas, Consejo Superior de Investigaciones Cientificas-UPV, 46022 Valencia, Spain. sfelena@ibmcp.upv.es〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/14684807" target="_blank"〉PubMed〈/a〉
    Keywords: *Adaptation, Physiological ; Animals ; *Biological Evolution ; Chlamydomonas/physiology ; Darkness ; *Ecosystem ; Environment ; *Genetic Variation ; Genotype ; Light ; Mutation ; Phenotype ; Pseudomonas fluorescens/genetics/*physiology ; RNA Viruses/physiology ; Selection, Genetic
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 2
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    Adaptation limits diversification of experimental bacterial populations (2003)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2003-12-20
    Description: Adaptation to a specific niche theoretically constrains a population's ability to subsequently diversify into other niches. We tested this theory using the bacterium Pseudomonas fluorescens, which diversifies into niche specialists when propagated in laboratory microcosms. Numerically dominant genotypes were allowed to diversify in isolation. As predicted, populations increased in fitness through time but showed a greatly decreased ability to diversify. Subsequent experiments demonstrated that niche generalists and reductions in intrinsic evolvability were not responsible for our data. These results show that niche specialization may come with a cost of reduced potential to diversify.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Buckling, Angus -- Wills, Matthew A -- Colegrave, Nick -- New York, N.Y. -- Science. 2003 Dec 19;302(5653):2107-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biology and Biochemistry, University of Bath, Bath BA2 7AY, UK. bssagjb@bath.ac.uk〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/14684817" target="_blank"〉PubMed〈/a〉
    Keywords: *Adaptation, Physiological ; *Biological Evolution ; *Ecosystem ; Environment ; *Genetic Variation ; Genotype ; Mutation ; Phenotype ; Pseudomonas fluorescens/cytology/genetics/*physiology ; Selection, Genetic
    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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    Neuroscience. ORs rule the roost in the olfactory system (2003)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2003-12-20
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lewcock, Joseph W -- Reed, Randall R -- New York, N.Y. -- Science. 2003 Dec 19;302(5653):2078-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute, Department of Molecular Biology and Genetics, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/14684811" target="_blank"〉PubMed〈/a〉
    Keywords: Action Potentials ; Alleles ; Animals ; Cell Nucleus/metabolism ; Chromosomes, Artificial, Yeast ; Feedback, Physiological ; *Gene Expression Regulation ; Genes, Reporter ; Mice ; Mice, Transgenic ; Multigene Family ; Odors ; Olfactory Receptor Neurons/*metabolism ; Promoter Regions, Genetic ; Pseudogenes ; Receptors, Odorant/*genetics/*metabolism ; Signal Transduction ; Transgenes
    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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    Crystal structure of the RC-LH1 core complex from Rhodopseudomonas palustris (2003)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2003-12-13
    Description: The crystal structure at 4.8 angstrom resolution of the reaction center-light harvesting 1 (RC-LH1) core complex from Rhodopseudomonas palustris shows the reaction center surrounded by an oval LH1 complex that consists of 15 pairs of transmembrane helical alpha- and beta-apoproteins and their coordinated bacteriochlorophylls. Complete closure of the RC by the LH1 is prevented by a single transmembrane helix, out of register with the array of inner LH1 alpha-apoproteins. This break, located next to the binding site in the reaction center for the secondary electron acceptor ubiquinone (UQB), may provide a portal through which UQB can transfer electrons to cytochrome b/c1.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Roszak, Aleksander W -- Howard, Tina D -- Southall, June -- Gardiner, Alastair T -- Law, Christopher J -- Isaacs, Neil W -- Cogdell, Richard J -- New York, N.Y. -- Science. 2003 Dec 12;302(5652):1969-72.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemistry, Institute of Biomedical and Life Sciences, University of Glasgow, Glasgow G12 8QQ, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/14671305" target="_blank"〉PubMed〈/a〉
    Keywords: Apoproteins/chemistry ; Bacterial Proteins/*chemistry ; Bacteriochlorophyll A/chemistry ; Binding Sites ; Crystallization ; Crystallography, X-Ray ; Light-Harvesting Protein Complexes/*chemistry ; Macromolecular Substances ; Models, Molecular ; Photosynthetic Reaction Center Complex Proteins/*chemistry ; Protein Conformation ; Protein Structure, Secondary ; Rhodopseudomonas/*chemistry ; Ubiquinone/chemistry
    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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    Anterior-posterior guidance of commissural axons by Wnt-frizzled signaling (2003)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2003-12-13
    Description: Commissural neurons in the mammalian dorsal spinal cord send axons ventrally toward the floor plate, where they cross the midline and turn anteriorly toward the brain; a gradient of chemoattractant(s) inside the spinal cord controls this turning. In rodents, several Wnt proteins stimulate the extension of commissural axons after midline crossing (postcrossing). We found that Wnt4 messenger RNA is expressed in a decreasing anterior-to-posterior gradient in the floor plate, and that a directed source of Wnt4 protein attracted postcrossing commissural axons. Commissural axons in mice lacking the Wnt receptor Frizzled3 displayed anterior-posterior guidance defects after midline crossing. Thus, Wnt-Frizzled signaling guides commissural axons along the anterior-posterior axis of the spinal cord.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lyuksyutova, Anna I -- Lu, Chin-Chun -- Milanesio, Nancy -- King, Leslie A -- Guo, Nini -- Wang, Yanshu -- Nathans, Jeremy -- Tessier-Lavigne, Marc -- Zou, Yimin -- New York, N.Y. -- Science. 2003 Dec 12;302(5652):1984-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Neurobiology, Pharmacology and Physiology, University of Chicago, Chicago, IL 60637, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/14671310" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Axons/*physiology/ultrastructure ; Brain/embryology/metabolism ; COS Cells ; Central Nervous System/cytology/*embryology/metabolism ; Cues ; Culture Techniques ; Diffusion ; Frizzled Receptors ; Gene Expression Profiling ; Growth Cones/physiology/ultrastructure ; In Situ Hybridization ; *Membrane Proteins ; Mice ; Mice, Knockout ; Neurons/*physiology ; Proteins/pharmacology ; Proto-Oncogene Proteins/*metabolism ; Rats ; Rats, Sprague-Dawley ; Receptors, G-Protein-Coupled/genetics/*metabolism ; *Signal Transduction ; Spinal Cord/*cytology/embryology/metabolism ; Transfection ; Wnt Proteins ; Wnt4 Protein
    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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    High-probability uniquantal transmission at excitatory synapses in barrel cortex (2003)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2003-12-13
    Description: The number of vesicles released at excitatory synapses and the number of release sites per synaptic connection are key determinants of information processing in the cortex, yet they remain uncertain. Here we show that the number of functional release sites and the number of anatomically identified synaptic contacts are equal at connections between spiny stellate and pyramidal cells in rat barrel cortex. Moreover, our results indicate that the amount of transmitter released per synaptic contact is independent of release probability and the intrinsic release probability is high. These properties suggest that connections between layer 4 and layer 2/3 are tuned for reliable transmission of spatially distributed, timing-based signals.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Silver, R Angus -- Lubke, Joachim -- Sakmann, Bert -- Feldmeyer, Dirk -- New York, N.Y. -- Science. 2003 Dec 12;302(5652):1981-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physiology, University College London, Gower Street, London WC1E 6BT, U.K. a.silver@ucl.ac.uk〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/14671309" target="_blank"〉PubMed〈/a〉
    Keywords: Action Potentials ; Analysis of Variance ; Animals ; Axons/physiology/ultrastructure ; Calcium/pharmacology ; Dendrites/physiology/ultrastructure ; Dipeptides/pharmacology ; Excitatory Amino Acid Antagonists/pharmacology ; Excitatory Postsynaptic Potentials/drug effects ; Glutamic Acid/metabolism ; Image Processing, Computer-Assisted ; In Vitro Techniques ; Kynurenic Acid/pharmacology ; Lysine/*analogs & derivatives ; Patch-Clamp Techniques ; Probability ; Pyramidal Cells/physiology ; Rats ; Rats, Wistar ; Receptors, Glutamate/metabolism ; Somatosensory Cortex/cytology/*physiology ; Synapses/*physiology ; Synaptic Transmission/*physiology
    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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    Paleontology. Marsupial origins (2003)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2003-12-13
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Cifelli, Richard L -- Davis, Brian M -- New York, N.Y. -- Science. 2003 Dec 12;302(5652):1899-900.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Oklahoma Museum of Natural History and Department of Zoology, University of Oklahoma, Norman, OK 73072, USA. rlc@ou.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/14671280" target="_blank"〉PubMed〈/a〉
    Keywords: Adaptation, Biological ; Animals ; *Biological Evolution ; Bone and Bones/anatomy & histology ; China ; *Fossils ; *Mammals/classification/genetics/physiology ; *Marsupialia/anatomy & histology/classification/genetics/physiology ; Paleontology ; Phylogeny ; Time
    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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    Neuroscience. The ups and downs of Wnt signaling (2003)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2003-12-13
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Imondi, Ralph -- Thomas, John B -- New York, N.Y. -- Science. 2003 Dec 12;302(5652):1903-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Molecular Neurobiology Laboratory, Salk Institute, La Jolla, CA 92037, USA. imondi@salk.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/14671283" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Axons/*physiology ; Central Nervous System/cytology/*embryology/metabolism ; Cues ; Diffusion ; Frizzled Receptors ; Gene Expression Profiling ; Growth Cones/physiology ; Mice ; Models, Neurological ; Neurons/physiology ; Proto-Oncogene Proteins/genetics/*metabolism ; RNA, Messenger/genetics/metabolism ; Rats ; Receptors, G-Protein-Coupled/genetics/*metabolism ; *Signal Transduction ; Spinal Cord/*cytology/embryology/metabolism ; Wnt Proteins ; Wnt4 Protein
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 9
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    Redistribution of intracellular oxygen in hypoxia by nitric oxide: effect on HIF1alpha (2003)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2003-12-13
    Description: Cells exposed to low oxygen concentrations respond by initiating defense mechanisms, including the stabilization of hypoxia-inducible factor (HIF) 1alpha, a transcription factor that upregulates genes such as those involved in glycolysis and angiogenesis. Nitric oxide and other inhibitors of mitochondrial respiration prevent the stabilization of HIF1alpha during hypoxia. In studies of cultured cells, we show that this effect is a result of an increase in prolyl hydroxylase-dependent degradation of HIF1alpha. With the use of Renilla luciferase to detect intracellular oxygen concentrations, we also demonstrate that, upon inhibition of mitochondrial respiration in hypoxia, oxygen is redistributed toward nonrespiratory oxygen-dependent targets such as prolyl hydroxylases so that they do not register hypoxia. Thus, the signaling consequences of hypoxia may be profoundly modified by nitric oxide.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hagen, Thilo -- Taylor, Cormac T -- Lam, Francis -- Moncada, Salvador -- New York, N.Y. -- Science. 2003 Dec 12;302(5652):1975-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Wolfson Institute for Biomedical Research, University College London, Gower Street, London WC1E 6BT, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/14671307" target="_blank"〉PubMed〈/a〉
    Keywords: Antioxidants/pharmacology ; *Cell Hypoxia ; Cell Line ; *Cell Respiration/drug effects ; Cycloheximide/pharmacology ; Cysteine Proteinase Inhibitors/pharmacology ; HeLa Cells ; Humans ; Hypoxia-Inducible Factor 1, alpha Subunit ; Leupeptins/*pharmacology ; Luciferases/metabolism ; Methacrylates ; Mitochondria/*metabolism ; Nitric Oxide/pharmacology/*physiology ; Nitric Oxide Donors/pharmacology ; Oxygen/*metabolism ; Procollagen-Proline Dioxygenase/metabolism ; Protein Synthesis Inhibitors/pharmacology ; Reactive Oxygen Species/metabolism ; Recombinant Fusion Proteins/metabolism ; Signal Transduction ; Thiazoles/pharmacology ; Transcription Factors/*metabolism ; Transfection ; Triazenes/pharmacology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
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  • 10
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    An Early Cretaceous tribosphenic mammal and metatherian evolution (2003)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2003-12-13
    Description: Derived features of a new boreosphenidan mammal from the Lower Cretaceous Yixian Formation of China suggest that it has a closer relationship to metatherians (including extant marsupials) than to eutherians (including extant placentals). This fossil dates to 125 million years ago and extends the record of marsupial relatives with skeletal remains by 50 million years. It also has many foot structures known only from climbing and tree-living extant mammals, suggesting that early crown therians exploited diverse niches. New data from this fossil support the view that Asia was likely the center for the diversification of the earliest metatherians and eutherians during the Early Cretaceous.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Luo, Zhe-Xi -- Ji, Qiang -- Wible, John R -- Yuan, Chong-Xi -- New York, N.Y. -- Science. 2003 Dec 12;302(5652):1934-40.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Carnegie Museum of Natural History, Pittsburgh, PA 15213, USA. luoz@carnegiemuseums.org〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/14671295" target="_blank"〉PubMed〈/a〉
    Keywords: Adaptation, Biological ; Animals ; *Biological Evolution ; Biomechanical Phenomena ; Bone and Bones/anatomy & histology ; China ; Dentition ; *Fossils ; Geography ; Locomotion ; *Mammals/anatomy & histology/classification/physiology ; *Marsupialia/anatomy & histology/classification/physiology ; Paleodontology ; Paleontology ; Phylogeny ; Time
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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