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  • American Association for the Advancement of Science (AAAS)  (13)
  • 1985-1989  (13)
  • 1
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    Federal science appointments (1989)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1989-12-15
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hess, C E -- New York, N.Y. -- Science. 1989 Dec 15;246(4936):1374.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17755981" 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
    Published by American Association for the Advancement of Science (AAAS)
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  • 2
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    Spatial patterns from oscillating microtubules (1989)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1989-12-08
    Description: Microtubules are fibers of the cytoskeleton involved in the generation of cell shape and motility. They can be highly dynamic and are capable of temporal oscillations in their state of assembly. Solutions of tubulin (the subunit protein of microtubules) and guanosine triphosphate (GTP, the cofactor required for microtubule assembly and oscillations) can generate various dissipative structures. They include traveling waves of microtubule assembly and disassembly as well as polygonal networks. The results imply that cytoskeletal proteins can form dynamic spatial structures by themselves, even in the absence of cellular organizing centers. Thus the microtubule system could serve as a simple model for studying pattern formation by biomolecules in vitro.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Mandelkow, E -- Mandelkow, E M -- Hotani, H -- Hess, B -- Muller, S C -- New York, N.Y. -- Science. 1989 Dec 8;246(4935):1291-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Max-Planck-Unit for Structural Molecular Biology, Hamburg, West Germany.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2588005" target="_blank"〉PubMed〈/a〉
    Keywords: Biopolymers ; Guanosine Diphosphate/metabolism ; Guanosine Triphosphate/metabolism ; Light ; Microscopy/methods ; Microtubules/*metabolism/ultrastructure ; Motion ; Scattering, Radiation ; Solutions ; Spectrophotometry, Ultraviolet ; Tubulin/metabolism ; Video Recording
    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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    Curvature and propagation velocity of chemical waves (1988)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1988-08-05
    Description: The collision of circular chemical waves in an excitable medium, the Belousov-Zhabotinskii reaction, leads to characteristic cusplike structures. The high curvatures of these structures are especially suitable for experimentally verifying the predicted proportionality between the velocity and the shape of traveling waves. A computerized spectrophotometric video technique with microscopic resolution was used to determine the proportionality factor (2 x 10(-5) square centimeter per second), which in this case is the diffusion coefficient of the autocatalytic species of the reaction system. A numerical calculation of the spatiotemporal evolution of the cusp structure is in good agreement with the experimental observations.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Foerster, P -- Muller, S C -- Hess, B -- New York, N.Y. -- Science. 1988 Aug 5;241(4866):685-7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17839079" target="_blank"〉PubMed〈/a〉
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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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    Evolution of the ratio of strontium-87 to strontium-86 in seawater from cretaceous to present (1986)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1986-02-28
    Description: A detailed record of the strontium-87 to strontium-86 ratio in seawater during the last 100 million years was determined by measuring this ratio in 137 well-preserved and well-dated fossil foraminifera samples. Sample preservation was evaluated from scanning electron microscopy studies, measured strontium-calcium ratios, and pore water strontium isotope ratios. The evolution of the strontium isotopic ratio in seawater offers a means to evaluate long-term changes in the global strontium isotope mass balance. Results show that the marine strontium isotope composition can be used for correlating and dating well-preserved authigenic marine sediments throughout much of the Cenozoic to a precision of +/-1 million years. The strontium-87 to strontium-86 ratio in seawater increased sharply across the Cretaceous/Tertiary boundary, but this feature is not readily explained as strontium input from a bolide impact on land.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hess, J -- Bender, M L -- Schilling, J G -- New York, N.Y. -- Science. 1986 Feb 28;231(4741):979-84.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17740296" target="_blank"〉PubMed〈/a〉
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 5
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    Calcium channels in planar lipid bilayers: insights into mechanisms of ion permeation and gating (1986)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1986-03-28
    Description: Electrophysiological recordings were used to analyze single calcium channels in planar lipid bilayers after membranes from bovine cardiac sarcolemmal vesicles had been incorporated into the bilayer. In these cell-free conditions, channels in the bilayer showed unitary barium or calcium conductances, gating kinetics, and pharmacological responses that were similar to dihydropyridine-sensitive calcium channels in intact cells. The open channel current varied in a nonlinear manner with voltage under asymmetric (that is, physiological) ionic conditions. However, with identical solutions on both sides of the bilayer, the current-voltage relation was linear. In matched experiments, calcium channels from skeletal muscle T-tubules differed significantly from cardiac calcium channels in their conductance properties and gating kinetics.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Rosenberg, R L -- Hess, P -- Reeves, J P -- Smilowitz, H -- Tsien, R W -- New York, N.Y. -- Science. 1986 Mar 28;231(4745):1564-6.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2420007" target="_blank"〉PubMed〈/a〉
    Keywords: 3-Pyridinecarboxylic acid, ; 1,4-dihydro-2,6-dimethyl-5-nitro-4-(2-(trifluoromethyl)phenyl)-, Methyl ester ; Animals ; Calcium/*physiology ; Cattle ; Electric Conductivity ; Heart/physiology ; In Vitro Techniques ; Ion Channels/*physiology ; Lipid Bilayers ; Nicotinic Acids/pharmacology ; Nifedipine/analogs & derivatives/pharmacology ; Nimodipine ; Potassium/physiology ; Sarcolemma ; Sodium/physiology
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 6
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    Heavy-electron metals: new highly correlated States of matter (1988)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1988-01-01
    Description: Heavy-electron metals exhibit highly correlated electronic behavior at liquid helium temperatures, with conduction-electron masses some hundred times the free-electron mass. Whether "normal," antiferromagnetic, or superconducting, their electronic behavior differs drastically from their ordinary metallic counterparts. The physical origin of the large mass and unusual superconducting and magnetic properties is the strong coupling between the conduction electrons and the local f-electron moment fluctuations characteristic of these materials.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Fisk, Z -- Hess, D W -- Pethick, C J -- Pines, D -- Smith, J L -- Thompson, J D -- Willis, J O -- New York, N.Y. -- Science. 1988 Jan 1;239(4835):33-42.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17820627" target="_blank"〉PubMed〈/a〉
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  • 7
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    Voltage-sensitive calcium channels in normal and transformed 3T3 fibroblasts (1988)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1988-02-26
    Description: Patch clamp recordings of whole-cell and single channel currents revealed the presence of two voltage-sensitive calcium channel types in the membrane of 3T3 fibroblasts. The two calcium channel types were identified by their unitary properties and pharmacological sensitivities. Both calcium channel types were present in all control 3T3 cells, but one type was selectively suppressed in 3T3 cells that had been transformed by activated c-H-ras, EJ-ras, v-fms, or polyoma middle T oncogenes. The presence of voltage-sensitive calcium channels in these nonexcitable cells and the control of their functional expression by transforming oncogenes raises questions about their role in the control of calcium-sensitive processes such as cell motility, cytoskeletal organization, and cell growth.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Chen, C F -- Corbley, M J -- Roberts, T M -- Hess, P -- CA21082/CA/NCI NIH HHS/ -- HL37124/HL/NHLBI NIH HHS/ -- New York, N.Y. -- Science. 1988 Feb 26;239(4843):1024-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physiology, Harvard Medical School, Boston, MA 02115.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2449730" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Calcium/*metabolism ; Calcium Channel Agonists ; Cell Division ; Cell Line ; Cell Line, Transformed ; *Cell Transformation, Neoplastic ; Electric Conductivity ; Fibroblasts/*physiology ; Ion Channels/drug effects/*physiology ; Kinetics ; Membrane Potentials ; Mice ; Nicotinic Acids/pharmacology ; Oncogenes ; *Oxadiazoles
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  • 8
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    Pork barreling (1988)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1988-11-11
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hess, C E -- New York, N.Y. -- Science. 1988 Nov 11;242(4880):846-7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3187523" target="_blank"〉PubMed〈/a〉
    Keywords: *Politics ; Research Support as Topic/economics/*legislation & jurisprudence ; United States
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  • 9
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    Cyclosporin A binding to calmodulin: a possible site of action on T lymphocytes (1985)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1985-04-19
    Description: Cyclosporin A, a potent immunosuppressive agent, has been widely used to treat patients with solid organ transplants. Although its precise mechanism of action is unknown, it appears to inhibit subsets of T lymphocytes at an early stage in cell activation. Fluorescent, fully active derivatives of cyclosporin A and calmodulin, a protein that binds calcium and is therefore essential to normal cell function, were utilized to demonstrate that cyclosporin A binds to calmodulin. Flow cytometry showed that the calmodulin inhibitors R24571 and W-7 competitively inhibited binding of cyclosporin A to cloned T lymphocytes. Cyclosporin A inhibited the calmodulin-dependent activation of phosphodiesterase in a dose-dependent manner. Binding of cyclosporin A to calmodulin may prevent the latter's role in the activation of the second messengers and enzymes required for effective cell proliferation and function in the immune response.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Colombani, P M -- Robb, A -- Hess, A D -- AI 20990/AI/NIAID NIH HHS/ -- CA 00958/CA/NCI NIH HHS/ -- CA 15396/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1985 Apr 19;228(4697):337-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3885394" target="_blank"〉PubMed〈/a〉
    Keywords: Binding, Competitive ; Calmodulin/*metabolism ; Carrier Proteins/metabolism ; Cyclosporins/*metabolism/pharmacology ; Dose-Response Relationship, Drug ; Flow Cytometry ; Imidazoles/pharmacology ; Lymphocyte Activation/drug effects ; Peptidylprolyl Isomerase ; Sulfonamides/pharmacology ; T-Lymphocytes/drug effects/*metabolism
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  • 10
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    cis- and trans-acting transcriptional regulation of visna virus (1985)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1985-08-02
    Description: Visna virus is a pathogenic lentivirus of sheep that is related to human T-cell lymphotropic virus type III (HTLV-III), the probable etiologic agent of the acquired immune deficiency syndrome (AIDS). The transcriptional activity of visna virus promoter and enhancer sequences was studied by means of an assay based on the transient expression of the bacterial gene chloramphenicol acetyltransferase (CAT). The results suggest that the high level of expression of visna virus is due in part to cis-acting enhancer sequences that give the viral promoter a high level of transcriptional activity. In addition, the rate of transcription from the visna virus promoter situated in a plasmid expressing the CAT gene was much greater in infected than uninfected cells. This phenomenon of trans-acting transcriptional activation may involve either virally or cellularly encoded factors.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hess, J L -- Clements, J E -- Narayan, O -- NS-15721/NS/NINDS NIH HHS/ -- NS-16145/NS/NINDS NIH HHS/ -- New York, N.Y. -- Science. 1985 Aug 2;229(4712):482-5.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2990051" target="_blank"〉PubMed〈/a〉
    Keywords: Acetyltransferases/genetics ; Animals ; Base Sequence ; Cell Line ; Chloramphenicol O-Acetyltransferase ; Choroid Plexus ; Chromosome Mapping ; Enhancer Elements, Genetic ; *Genes, Regulator ; Goats ; Humans ; L Cells (Cell Line) ; Macrophages ; Mice ; Plasmids ; Promoter Regions, Genetic ; Sheep ; Synovial Membrane ; T-Lymphocytes ; *Transcription, Genetic ; Transfection ; Visna-maedi virus/*genetics
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