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  • Articles  (361)
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  • Articles  (361)
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  • American Association for the Advancement of Science (AAAS)  (361)
  • American Geophysical Union
  • American Meteorological Society
  • American Physical Society (APS)
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  • 11
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    Mapping the main immunogenic region and toxin-binding site of the nicotinic acetylcholine receptor (1987)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1987-01-02
    Description: The alpha-chain of the nicotinic acetylcholine receptor carries the binding sites both for cholinergic ligands and for most experimentally induced or naturally occurring antibodies to the native receptor. By means of expression cloning in Escherichia coli, fusion proteins were derived from specific fragments of a complementary DNA encoding the mouse alpha-chain, allowing the mapping of the toxin-binding site to residues 160-216 and the main immunogenic region to residues 6-85. This approach permits the independent study of different functional domains of a complex receptor molecule and should be generally applicable to other proteins for which complementary DNA clones are available.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Barkas, T -- Mauron, A -- Roth, B -- Alliod, C -- Tzartos, S J -- Ballivet, M -- New York, N.Y. -- Science. 1987 Jan 2;235(4784):77-80.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2432658" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Antibodies, Monoclonal/immunology ; Binding Sites ; Binding, Competitive ; Bungarotoxins/metabolism ; Cloning, Molecular ; Epitopes ; Humans ; Immunosorbent Techniques ; Ligands ; Mice ; Receptors, Nicotinic/genetics/*immunology ; Recombinant Fusion Proteins/immunology ; Species Specificity ; Structure-Activity Relationship
    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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  • 12
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    Newly identified 'glutamate interneurons' and their role in locomotion in the lamprey spinal cord (1987)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1987-04-17
    Description: A new class of excitatory premotor interneurons that are important in the generation of locomotion in the lamprey has now been described. In the isolated spinal cord, these neurons act simultaneously with their postsynaptic motoneurons during fictive swimming. They are small and numerous, and they monosynaptically excite both motoneurons and inhibitory premotor interneurons. The excitatory postsynaptic potentials are depressed by an antagonist of excitatory amino acids. These interneurons receive reticulospinal input from the brain stem and polysynaptic input form skin afferents. A model of the network underlying locomotion based on the synaptic interactions of these neurons can now be proposed for the lamprey.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Buchanan, J T -- Grillner, S -- 5 F32 NS07314-03/NS/NINDS NIH HHS/ -- New York, N.Y. -- Science. 1987 Apr 17;236(4799):312-4.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3563512" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Electric Stimulation ; Evoked Potentials ; Fishes/*physiology ; Glutamates/*physiology ; Interneurons/cytology/*physiology ; Lampreys/*physiology ; *Locomotion ; Motor Neurons/physiology ; Spinal Cord/cytology/*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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  • 13
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    Sodium-calcium exchange in heart: membrane currents and changes in [Ca2+]i (1987)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1987-12-18
    Description: Recordings have been made of changes in intracellular calcium ion concentration ([Ca2+]i) that can be attributed to the operation of an electrogenic, voltage-dependent sodium-calcium (Na-Ca) exchanger in mammalian heart cells. Guinea pig ventricular myocytes under voltage clamp were perfused internally with fura-2, a fluorescent Ca2+-indicator, and changes in [Ca2+]i and membrane current that resulted from Na-Ca exchange were identified through the use of various organic channel blockers and impermeant ions. Depolarization of cells elicited slow increases in [Ca2+]i, with the maximum increase depending on internal [Na+], external [Ca2+], and membrane voltage. Repolarization was associated with net Ca2+ efflux and a decline in the inward current that developed instantaneously upon repolarization. The relation between [Ca2+]i and current was linear, and the slope was made steeper by hyperpolarization.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Barcenas-Ruiz, L -- Beuckelmann, D J -- Wier, W G -- HL29473/HL/NHLBI NIH HHS/ -- New York, N.Y. -- Science. 1987 Dec 18;238(4834):1720-2.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physiology, University of Maryland School of Medicine, Baltimore.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3686010" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Calcium/*metabolism ; Carrier Proteins/*physiology ; Cell Membrane/physiology ; Guinea Pigs ; Heart/*physiology ; In Vitro Techniques ; Kinetics ; Membrane Potentials ; Sodium-Calcium Exchanger ; Ventricular Function
    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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  • 14
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    Immunity to schistosomes: progress toward vaccine (1987)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1987-11-20
    Description: Among the major parasitic infections, schistosomiasis may be the most promising candidate for human vaccination. Information about mechanisms of immunity, gained mainly from experimental models but likely to be relevant to human infection, indicates a dynamic balance between protective and regulatory (blocking) mechanisms. Besides cell-mediated responses leading to macrophage activation, antibody-dependent cell-mediated cytotoxicity systems involving precise antibody isotypes and nonlymphoid cells (mononuclear phagocytes, eosinophils, and platelets) appear to be essential effectors of immune attack. The slow development of immunity in humans seems related to the production of antibodies that cross-react with schistosomulum surface antigen and block the binding of antibodies of the effector isotype. Schistosomes that survive in the bloodstream and produce chronic infections may evade the immune system as a result of intrinsic changes in membrane susceptibility and of transient expression of target antigens; at other stages of the parasite life cycle, cross-reactive molecules may be secreted that play an essential role in the induction of immunity. Several schistosome proteins have been characterized as candidates for vaccination. Among these, an antigen of 28 kilodaltons has been cloned and shown to be immunogenic in humans and protective in mice, rats, and baboons.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Capron, A -- Dessaint, J P -- Capron, M -- Ouma, J H -- Butterworth, A E -- New York, N.Y. -- Science. 1987 Nov 20;238(4830):1065-72.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Centre d'Immunologie et de Biologie Parasitaire, Unite Mixte INSERM 167-CNRS 624, Institut Pasteur, Lille, France.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3317823" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antibodies, Helminth/immunology ; Antibody-Dependent Cell Cytotoxicity ; Antigens, Helminth/immunology ; Cytotoxicity, Immunologic ; Humans ; Immunity, Cellular ; Schistosoma/*immunology ; Schistosomiasis/*immunology ; Vaccines/immunology
    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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  • 15
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    Biologics gain influence in expanding NCI program (1987)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1987-08-21
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Barnes, D M -- New York, N.Y. -- Science. 1987 Aug 21;237(4817):848-50.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2441472" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Biological Assay ; Humans ; Interferons/therapeutic use ; Interleukin-2/therapeutic use ; National Institutes of Health (U.S.) ; Neoplasms/*therapy ; United States
    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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  • 16
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    Neural models yield data on learning (1987)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1987-06-26
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Barnes, D M -- New York, N.Y. -- Science. 1987 Jun 26;236(4809):1628-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3603002" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Learning/*physiology ; Models, Neurological ; Neuronal Plasticity ; Neurons/*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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  • 17
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    Close encounters with an osteoclast (1987)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1987-05-22
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Barnes, D M -- New York, N.Y. -- Science. 1987 May 22;236(4804):914-6.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3576208" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Bone Development ; *Bone Resorption ; Cell Communication ; Humans ; Osteoclasts/*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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  • 18
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    Broad issues debated at AIDS vaccine workshop (1987)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1987-04-17
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Barnes, D M -- New York, N.Y. -- Science. 1987 Apr 17;236(4799):255-7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3551072" target="_blank"〉PubMed〈/a〉
    Keywords: Acquired Immunodeficiency Syndrome/immunology/*prevention & control ; Animals ; Clinical Trials as Topic ; Drug Evaluation, Preclinical ; HIV/immunology ; Humans ; Pan troglodytes ; United States ; United States Food and Drug Administration ; Viral Vaccines/*therapeutic use
    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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  • 19
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    A physiological basis for a theory of synapse modification (1987)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1987-07-03
    Description: The functional organization of the cerebral cortex is modified dramatically by sensory experience during early postnatal life. The basis for these modifications is a type of synaptic plasticity that may also contribute to some forms of adult learning. The question of how synapses modify according to experience has been approached by determining theoretically what is required of a modification mechanism to account for the available experimental data in the developing visual cortex. The resulting theory states precisely how certain variables might influence synaptic modifications. This insight has led to the development of a biologically plausible molecular model for synapse modification in the cerebral cortex.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Bear, M F -- Cooper, L N -- Ebner, F F -- New York, N.Y. -- Science. 1987 Jul 3;237(4810):42-8.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3037696" target="_blank"〉PubMed〈/a〉
    Keywords: Action Potentials ; Algorithms ; Animals ; Cats ; Learning/*physiology ; Models, Theoretical ; *Neuronal Plasticity ; Synapses/*physiology ; Synaptic Transmission ; Time Factors ; Visual Cortex/*physiology ; Visual Pathways/physiology
    Print ISSN: 0036-8075
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  • 20
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    Differential expression of c-myb mRNA in murine B lymphomas by a block to transcription elongation (1987)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1987-09-18
    Description: Expression of c-myb proto-oncogene messenger RNA (mRNA) and protein has been detected principally in tumors and in normal tissue of hematopoietic origin. In each hematopoietic lineage examined, expression of the c-myb gene is markedly downregulated during hematopoietic maturation. However, the mechanism by which differential expression of the c-myb gene is regulated is not known. In murine B-lymphoid tumor cell lines, the amount of steady-state c-myb mRNA is 10 to more than 100 times greater in pre-B cell lymphomas than in B cell lymphomas and plasmacytomas. The downregulation of c-myb mRNA correlates with events at the pre-B cell-B cell junction. Differential expression of c-myb mRNA levels detected between a pre-B cell lymphoma and a mature B cell lymphoma is now shown to be mediated by a block to transcription elongation in the first intron of the c-myb locus. In addition, this developmentally regulated difference in transcriptional activity is correlated with alterations in higher order chromatin structure as reflected by changes in the patterns of hypersensitivity to deoxyribonuclease I at the 5' end of the c-myb transcription unit. Regulation of transcription elongation may provide a more sensitive mechanism for rapidly increasing and decreasing mRNA levels in response to external stimuli than regulation of the initiation of transcription.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Bender, T P -- Thompson, C B -- Kuehl, W M -- New York, N.Y. -- Science. 1987 Sep 18;237(4821):1473-6.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3498214" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; B-Lymphocytes ; Chromosome Mapping ; *Gene Expression Regulation ; Introns ; Lymphoma/*genetics ; Mice ; Nucleic Acid Hybridization ; *Peptide Chain Elongation, Translational ; *Proto-Oncogenes ; RNA, Messenger/*metabolism ; *Transcription, Genetic
    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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