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  • 1
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    Photochemically driven collapse of Titan's atmosphere (1997)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1997-01-31
    Description: Saturn's giant moon Titan has a thick (1.5 bar) nitrogen atmosphere, which has a temperature structure that is controlled by the absorption of solar and thermal radiation by methane, hydrogen, and organic aerosols into which methane is irreversibly converted by photolysis. Previous studies of Titan's climate evolution have been done with the assumption that the methane abundance was maintained against photolytic depletion throughout Titan's history, either by continuous supply from the interior or by buffering by a surface or near surface reservoir. Radiative-convective and radiative-saturated equilibrium models of Titan's atmosphere show that methane depletion may have allowed Titan's atmosphere to cool so that nitrogen, its main constituent, condenses onto the surface, collapsing Titan into a Triton-like frozen state with a thin atmosphere.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lorenz, R D -- McKay, C P -- Lunine, J I -- New York, N.Y. -- Science. 1997 Jan 31;275(5300):642-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Planetary Sciences, Lunar and Planetary Laboratory, University of Arizona, Tucson 85721, USA.rlorenz@pl.arizona.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9005844" target="_blank"〉PubMed〈/a〉
    Keywords: Atmosphere ; *Evolution, Planetary ; *Extraterrestrial Environment ; *Methane ; *Nitrogen ; Photolysis ; *Saturn ; Temperature
    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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    Genetic testing for cancer risk (1997)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1997-11-14
    Description: Genetic testing for cancer susceptibility is already part of the clinical management of families with some of the well-defined (but uncommon) inherited cancer syndromes. In cases where the risks associated with a predisposing mutation are less certain, or where there is no clearly effective intervention to offer those with a positive result, its use is more controversial. Careful evaluation of costs and benefits, and of the efficacy of interventions in those found to be at risk, is essential and is only just beginning. An immediate challenge is to ensure that both health professionals and the public understand clearly the issues involved.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ponder, B -- New York, N.Y. -- Science. 1997 Nov 7;278(5340):1050-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Oncology, University of Cambridge, Addenbrooke's Hospital, Box 238, Level 3 Lab Block, Hills Road, Cambridge CB2 2QQ, UK. bajp@mole.bio.cam.ac.uk〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9353178" target="_blank"〉PubMed〈/a〉
    Keywords: Confidentiality ; Cost-Benefit Analysis ; Female ; Genetic Counseling ; Genetic Predisposition to Disease ; Genetic Services ; *Genetic Testing ; Genetic Variation ; Humans ; Insurance, Health ; Insurance, Life ; Male ; Mutation ; Neoplasms/*diagnosis/*genetics ; Resource Allocation ; Risk Assessment ; Risk Factors ; Uncertainty
    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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    PtdIns(3,4,5)P3 gets its message across (1997)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1997-07-25
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hemmings, B A -- New York, N.Y. -- Science. 1997 Jul 25;277(5325):534.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Friedrich Miescher Institute, CH-4002 Basel, Switzerland. hemmings@fmi.ch〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9254423" target="_blank"〉PubMed〈/a〉
    Keywords: 3-Phosphoinositide-Dependent Protein Kinases ; Enzyme Activation ; Phosphatidylinositol Phosphates/*metabolism ; Phosphorylation ; Protein-Serine-Threonine Kinases/chemistry/*metabolism ; Proto-Oncogene Proteins/chemistry/*metabolism ; Proto-Oncogene Proteins c-akt ; Second Messenger Systems ; Signal Transduction
    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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  • 4
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    Sexual selection in Asian elephants (1997)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1997-12-31
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Tiedemann, R -- New York, N.Y. -- Science. 1997 Nov 28;278(5343):1550-1.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9411772" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Elephants/*anatomy & histology/*physiology ; Female ; Incisor/anatomy & histology ; India ; Male ; Models, Biological ; Models, Statistical ; *Sexual Behavior, Animal ; Sri Lanka
    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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    Angiopoietin-2, a natural antagonist for Tie2 that disrupts in vivo angiogenesis (1997)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1997-07-04
    Description: Angiogenesis is thought to depend on a precise balance of positive and negative regulation. Angiopoietin-1 (Ang1) is an angiogenic factor that signals through the endothelial cell-specific Tie2 receptor tyrosine kinase. Like vascular endothelial growth factor, Ang1 is essential for normal vascular development in the mouse. An Ang1 relative, termed angiopoietin-2 (Ang2), was identified by homology screening and shown to be a naturally occurring antagonist for Ang1 and Tie2. Transgenic overexpression of Ang2 disrupts blood vessel formation in the mouse embryo. In adult mice and humans, Ang2 is expressed only at sites of vascular remodeling. Natural antagonists for vertebrate receptor tyrosine kinases are atypical; thus, the discovery of a negative regulator acting on Tie2 emphasizes the need for exquisite regulation of this angiogenic receptor system.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Maisonpierre, P C -- Suri, C -- Jones, P F -- Bartunkova, S -- Wiegand, S J -- Radziejewski, C -- Compton, D -- McClain, J -- Aldrich, T H -- Papadopoulos, N -- Daly, T J -- Davis, S -- Sato, T N -- Yancopoulos, G D -- New York, N.Y. -- Science. 1997 Jul 4;277(5322):55-60.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Regeneron Pharmaceuticals Inc., 777 Old Saw Mill River Road, Tarrytown, NY 10591, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9204896" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Angiopoietin-1 ; Angiopoietin-2 ; Animals ; Blood Vessels/embryology/*metabolism ; Cells, Cultured ; Cloning, Molecular ; Embryo, Mammalian/metabolism ; Endothelial Growth Factors/genetics/metabolism ; Endothelium, Vascular/*cytology/metabolism ; Female ; Humans ; Ligands ; Lymphokines/genetics/metabolism ; Membrane Glycoproteins/antagonists & inhibitors/metabolism ; Mice ; Mice, Transgenic ; Molecular Sequence Data ; *Neovascularization, Physiologic ; Phosphorylation ; Proteins/chemistry/*metabolism ; Rats ; Rats, Sprague-Dawley ; Receptor Protein-Tyrosine Kinases/*antagonists & inhibitors/metabolism ; Receptor, TIE-2 ; Recombinant Fusion Proteins/metabolism ; Signal Transduction ; Vascular Endothelial Growth Factor A ; Vascular Endothelial Growth Factors
    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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    Integrating genetic approaches into the discovery of anticancer drugs (1997)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1997-11-14
    Description: The discovery of anticancer drugs is now driven by the numerous molecular alterations identified in tumor cells over the past decade. To exploit these alterations, it is necessary to understand how they define a molecular context that allows increased sensitivity to particular compounds. Traditional genetic approaches together with the new wealth of genomic information for both human and model organisms open up strategies by which drugs can be profiled for their ability to selectively kill cells in a molecular context that matches those found in tumors. Similarly, it may be possible to identify and validate new targets for drugs that would selectively kill tumor cells with a particular molecular context. This article outlines some of the ways that yeast genetics can be used to streamline anticancer drug discovery.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hartwell, L H -- Szankasi, P -- Roberts, C J -- Murray, A W -- Friend, S H -- N01-BC65017/BC/NCI NIH HHS/ -- New York, N.Y. -- Science. 1997 Nov 7;278(5340):1064-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Seattle Project, Molecular Pharmacology Department, Fred Hutchinson Cancer Research Center, Seattle, WA 98109, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9353181" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Antineoplastic Agents/pharmacology/therapeutic use ; *Drug Design ; *Drug Screening Assays, Antitumor ; Humans ; Mutation ; Neoplasms/*drug therapy/genetics ; Signal Transduction ; Yeasts/genetics
    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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    Osmotic activation of the HOG MAPK pathway via Ste11p MAPKKK: scaffold role of Pbs2p MAPKK (1997)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1997-06-13
    Description: Exposure of the yeast Saccharomyces cerevisiae to high extracellular osmolarity induces the Sln1p-Ypd1p-Ssk1p two-component osmosensor to activate a mitogen-activated protein (MAP) kinase cascade composed of the Ssk2p and Ssk22p MAP kinase kinase kinases (MAPKKKs), the Pbs2p MAPKK, and the Hog1p MAPK. A second osmosensor, Sho1p, also activated Pbs2p and Hog1p, but did so through the Ste11p MAPKKK. Although Ste11p also participates in the mating pheromone-responsive MAPK cascade, there was no detectable cross talk between these two pathways. The MAPKK Pbs2p bound to the Sho1p osmosensor, the MAPKKK Ste11p, and the MAPK Hog1p. Thus, Pbs2p may serve as a scaffold protein.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Posas, F -- Saito, H -- GM50909/GM/NIGMS NIH HHS/ -- GM53415/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1997 Jun 13;276(5319):1702-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Division of Tumor Immunology, Dana-Farber Cancer Institute, Boston, MA 02115, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9180081" target="_blank"〉PubMed〈/a〉
    Keywords: Calcium-Calmodulin-Dependent Protein Kinases/*metabolism ; Enzyme Activation ; Genes, Fungal ; Genetic Complementation Test ; MAP Kinase Kinase Kinases ; *Mitogen-Activated Protein Kinase Kinases ; *Mitogen-Activated Protein Kinases ; Mutation ; Osmolar Concentration ; Osmotic Pressure ; Peptides/metabolism ; Phosphorylation ; Protein Kinases/*metabolism ; Protein-Serine-Threonine Kinases/*metabolism ; Protein-Tyrosine Kinases/genetics/*metabolism ; Recombinant Fusion Proteins/metabolism ; Saccharomyces cerevisiae/*enzymology/genetics ; *Saccharomyces cerevisiae Proteins ; Signal Transduction
    Print ISSN: 0036-8075
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  • 8
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    Pain affect encoded in human anterior cingulate but not somatosensory cortex (1997)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1997-08-15
    Description: Recent evidence demonstrating multiple regions of human cerebral cortex activated by pain has prompted speculation about their individual contributions to this complex experience. To differentiate cortical areas involved in pain affect, hypnotic suggestions were used to alter selectively the unpleasantness of noxious stimuli, without changing the perceived intensity. Positron emission tomography revealed significant changes in pain-evoked activity within anterior cingulate cortex, consistent with the encoding of perceived unpleasantness, whereas primary somatosensory cortex activation was unaltered. These findings provide direct experimental evidence in humans linking frontal-lobe limbic activity with pain affect, as originally suggested by early clinical lesion studies.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Rainville, P -- Duncan, G H -- Price, D D -- Carrier, B -- Bushnell, M C -- New York, N.Y. -- Science. 1997 Aug 15;277(5328):968-71.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉D-epartement de Psychologie and Centre de Recherche en Sciences Neurologiques, Universite de Montreal, Montreal, Quebec, Canada H3C 3J7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9252330" target="_blank"〉PubMed〈/a〉
    Keywords: Adult ; Affect/*physiology ; *Brain Mapping ; Female ; Frontal Lobe/blood supply/*physiology/radionuclide imaging ; Gyrus Cinguli/blood supply/*physiology/radionuclide imaging ; Humans ; Hypnosis ; Male ; Middle Aged ; Pain/*physiopathology/*psychology ; Pain Measurement ; Regional Blood Flow ; Regression Analysis ; Somatosensory Cortex/blood supply/*physiology/radionuclide imaging ; Thermosensing ; Tomography, Emission-Computed
    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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  • 9
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    Rescue of a Drosophila NF1 mutant phenotype by protein kinase A (1997)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1997-05-02
    Description: The neurofibromatosis type 1 (NF1) tumor suppressor protein is thought to restrict cell proliferation by functioning as a Ras-specific guanosine triphosphatase-activating protein. However, Drosophila homozygous for null mutations of an NF1 homolog showed no obvious signs of perturbed Ras1-mediated signaling. Loss of NF1 resulted in a reduction in size of larvae, pupae, and adults. This size defect was not modified by manipulating Ras1 signaling but was restored by expression of activated adenosine 3', 5'-monophosphate-dependent protein kinase (PKA). Thus, NF1 and PKA appear to interact in a pathway that controls the overall growth of Drosophila.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉The, I -- Hannigan, G E -- Cowley, G S -- Reginald, S -- Zhong, Y -- Gusella, J F -- Hariharan, I K -- Bernards, A -- NS22229/NS/NINDS NIH HHS/ -- NS34779/NS/NINDS NIH HHS/ -- NS36084/NS/NINDS NIH HHS/ -- etc. -- New York, N.Y. -- Science. 1997 May 2;276(5313):791-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Massachusetts General Hospital Cancer Center and Harvard Medical School Building 149, 13th Street, Charlestown, MA 02129, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9115203" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Cell Count ; Cyclic AMP/metabolism ; Cyclic AMP-Dependent Protein Kinases/genetics/*metabolism ; Drosophila/cytology/*genetics/growth & development/metabolism ; *Drosophila Proteins ; GTP Phosphohydrolases/metabolism ; Genes, Insect ; Insect Proteins/chemistry/genetics/*metabolism ; Molecular Sequence Data ; Mutation ; *Nerve Tissue Proteins ; Neurofibromin 1 ; Phenotype ; Proteins/chemistry/genetics ; Recombinant Fusion Proteins/pharmacology ; Signal Transduction ; *ras GTPase-Activating Proteins ; ras Proteins/metabolism
    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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  • 10
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    A mouse model with features of familial combined hyperlipidemia (1997)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1997-01-17
    Description: Familial combined hyperlipidemia (FCHL) is a common inherited lipid disorder, affecting 1 to 2 percent of the population in Westernized societies. Individuals with FCHL have large quantities of very low density lipoprotein (VLDL) and low density lipoprotein (LDL) and develop premature coronary heart disease. A mouse model displaying some of the features of FCHL was created by crossing mice carrying the human apolipoprotein C-III (APOC3) transgene with mice deficient in the LDL receptor. A synergistic interaction between the apolipoprotein C-III and the LDL receptor defects produced large quantities of VLDL and LDL and enhanced the development of atherosclerosis. This mouse model may provide clues to the origin of human FCHL.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Masucci-Magoulas, L -- Goldberg, I J -- Bisgaier, C L -- Serajuddin, H -- Francone, O L -- Breslow, J L -- Tall, A R -- HL 21006/HL/NHLBI NIH HHS/ -- HL 54591/HL/NHLBI NIH HHS/ -- New York, N.Y. -- Science. 1997 Jan 17;275(5298):391-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Medicine, Columbia University, 630 West 168 Street, New York, NY 10032, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8994037" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Apolipoprotein C-III ; Apolipoproteins B/blood ; Apolipoproteins C/*genetics ; Apolipoproteins E/blood ; Arteriosclerosis/etiology ; Carrier Proteins/genetics ; Cholesterol/blood ; Cholesterol Ester Transfer Proteins ; Cholesterol, HDL/blood ; Cholesterol, LDL/blood ; Cholesterol, VLDL/blood ; Diet ; *Disease Models, Animal ; Disease Susceptibility ; Female ; *Glycoproteins ; Humans ; *Hyperlipidemia, Familial Combined/blood/genetics ; Hyperlipoproteinemia Type IV/genetics ; Lipoproteins/blood ; Lipoproteins, VLDL/blood ; Male ; Mice ; Mice, Inbred C57BL ; *Mice, Transgenic ; Receptors, LDL/*genetics/metabolism ; Transgenes ; Triglycerides/blood
    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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