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  • Articles  (22)
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  • Articles  (22)
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  • American Association for the Advancement of Science (AAAS)  (22)
  • American Geophysical Union
  • American Meteorological Society
  • Blackwell Publishing Ltd
  • Springer Nature
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  • 1
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    Associative induction of posttetanic and long-term potentiation in CA1 neurons of rat hippocampus (1986)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1986-05-23
    Description: Electrical stimulation of fibers in the stratum radiatum causes an excitatory postsynaptic potential in CA1 neurons of the hippocampus. Other excitatory inputs to or direct depolarization of these CA1 neurons during stimulation of the stratum radiatum caused a subsequent increase in the excitatory postsynaptic potential. This enhancement was characterized as a brief potentiation (2 to 3 minutes, similar to posttetanic potentiation) and a long-term potentiation (presumed to be involved in learning and memory). These potentiations are probably induced by an interaction of the postsynaptic cell or other presynaptic terminals with the test presynaptic terminals.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sastry, B R -- Goh, J W -- Auyeung, A -- New York, N.Y. -- Science. 1986 May 23;232(4753):988-90.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3010459" target="_blank"〉PubMed〈/a〉
    Keywords: Action Potentials ; Animals ; Brain Mapping ; Calcium/physiology ; Conditioning (Psychology)/physiology ; Electric Stimulation ; Hippocampus/*physiology ; In Vitro Techniques ; Learning/physiology ; Membrane Potentials ; Rats ; Synapses/physiology ; Synaptic Transmission
    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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    Three-dimensional structure of an antigen-antibody complex at 2.8 A resolution (1986)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1986-08-15
    Description: The 2.8 A resolution three-dimensional structure of a complex between an antigen (lysozyme) and the Fab fragment from a monoclonal antibody against lysozyme has been determined and refined by x-ray crystallographic techniques. No conformational changes can be observed in the tertiary structure of lysozyme compared with that determined in native crystalline forms. The quaternary structure of Fab is that of an extended conformation. The antibody combining site is a rather flat surface with protuberances and depressions formed by its amino acid side chains. The antigen-antibody interface is tightly packed, with 16 lysozyme and 17 antibody residues making close contacts. The antigen contacting residues belong to two stretches of the lysozyme polypeptide chain: residues 18 to 27 and 116 to 129. All the complementarity-determining regions and two residues outside hypervariable positions of the antibody make contact with the antigen. Most of these contacts (10 residues out of 17) are made by the heavy chain, and in particular by its third complementarity-determining region. Antigen variability and antibody specificity and affinity are discussed on the basis of the determined structure.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Amit, A G -- Mariuzza, R A -- Phillips, S E -- Poljak, R J -- New York, N.Y. -- Science. 1986 Aug 15;233(4765):747-53.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2426778" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Antibodies, Monoclonal ; *Antigen-Antibody Complex ; Chickens ; Egg White ; Epitopes ; *Immunoglobulin Fab Fragments ; Immunoglobulin Heavy Chains ; Immunoglobulin Light Chains ; In Vitro Techniques ; Kinetics ; Models, Molecular ; Muramidase/*immunology ; Protein Conformation ; X-Ray Diffraction
    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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    Dynamics of lymphocyte-endothelial interactions in vivo (1986)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1986-01-24
    Description: The dynamics of the attachment of lymphocytes to the endothelium of high endothelial venules in murine Peyer's patches were studied in vivo. Lymphocytes adhered readily to the endothelium lining these vessels, but most of the adhering cells detached within a few seconds. Many lymphocytes, however, experienced multiple collisions with the high endothelial venules, and this substantially increased the efficiency of lymphocyte collection by these vessels.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Bjerknes, M -- Cheng, H -- Ottaway, C A -- New York, N.Y. -- Science. 1986 Jan 24;231(4736):402-5.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3941903" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Endothelium/physiology ; Female ; In Vitro Techniques ; Lymphocytes/*physiology ; Mice ; Mice, Inbred BALB C ; Microscopy, Fluorescence ; Peyer's Patches/*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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  • 4
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    Human beta-adrenoceptors: relation of myocardial and lymphocyte beta-adrenoceptor density (1986)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1986-03-28
    Description: In human right atria obtained from 21 patients during open-heart surgery, beta-adrenoceptor density [assessed by iodine-125-labeled (-)-cyanopindolol binding] and responsiveness (positive inotropic responses to isoprenaline) were linearly related to the beta-adrenoceptor density in the corresponding circulating lymphocytes. This direct relation of human myocardial and lymphocyte beta-adrenoceptor alterations, therefore, makes it possible to monitor drug- or disease-induced beta-adrenoceptor changes in tissues not easily accessible in humans.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Brodde, O E -- Kretsch, R -- Ikezono, K -- Zerkowski, H R -- Reidemeister, J C -- New York, N.Y. -- Science. 1986 Mar 28;231(4745):1584-5.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3006250" target="_blank"〉PubMed〈/a〉
    Keywords: Female ; Heart Atria ; Humans ; In Vitro Techniques ; Isoproterenol/pharmacology ; Lymphocytes/*metabolism ; Male ; Middle Aged ; Myocardial Contraction/drug effects ; Myocardium/*metabolism ; Receptors, Adrenergic, beta/*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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  • 5
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    A low threshold calcium spike mediates firing pattern alterations in pontine reticular neurons (1986)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1986-11-07
    Description: Intracellular electrical recordings in an in vitro slice preparation of the brainstem medial pontine reticular formation, a region thought to be important in mediation of desynchronized sleep phenomena, demonstrate a population of neurons that have a calcium-dependent, low threshold spike. This low threshold spike was inactivated at relatively depolarized membrane potential levels and, when this spike was deinactivated, it induced a burst of action potentials. The membrane potential dependence of the spike may underlie changes in action potential firing patterns associated with behavioral state change because the baseline membrane potential in neurons of the medial pontine reticular population depolarizes during passage from waking and slow wave sleep to desynchronized sleep, which is characterized by the absence of burst firing.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Greene, R W -- Haas, H L -- McCarley, R W -- MH 39,683/MH/NIMH NIH HHS/ -- New York, N.Y. -- Science. 1986 Nov 7;234(4777):738-40.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3775364" target="_blank"〉PubMed〈/a〉
    Keywords: Action Potentials ; Animals ; Calcium/physiology ; Electric Stimulation ; In Vitro Techniques ; Membrane Potentials ; Pons/cytology/*physiology ; Rats
    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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    Inhibition of endothelial regeneration by type-beta transforming growth factor from platelets (1986)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1986-09-05
    Description: Damage to the vessel wall is a signal for endothelial migration and replication and for platelet release at the site of injury. Addition of transforming growth factor-beta (TGF-beta) purified from platelets to growing aortic endothelial cells inhibited [3H]thymidine incorporation in a concentration-dependent manner. A transient inhibition of DNA synthesis was also observed in response to wounding; cell migration and replication are inhibited during the first 24 hours after wounding. By 48 hours after wounding both TGF-beta-treated and -untreated cultures showed similar responses. Flow microfluorimetric analysis of cell cycle distribution indicated that after 24 hours of exposure to TGF-beta the cells were blocked from entering S phase, and the fraction of cells in G1 was increased. The inhibition of the initiation of regeneration by TGF-beta could allow time for recruitment of smooth muscle cells into the site of injury by other platelet components.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Heimark, R L -- Twardzik, D R -- Schwartz, S M -- HL-18645/HL/NHLBI NIH HHS/ -- New York, N.Y. -- Science. 1986 Sep 5;233(4768):1078-80.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3461562" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Blood Platelets/*physiology ; Cell Cycle/drug effects ; Cell Movement/drug effects ; Cells, Cultured ; Endothelium/cytology/*physiology ; Flow Cytometry ; *Growth Inhibitors ; Humans ; In Vitro Techniques ; Peptides/*pharmacology ; Rats ; Regeneration ; Transforming 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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  • 7
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    The role of chloride transport in postsynaptic inhibition of hippocampal neurons (1986)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1986-06-13
    Description: Hippocampal inhibitory postsynaptic potentials are depolarizing in granule cells but hyperpolarizing in CA3 neurons because the reversal potentials and membrane potentials of these cells differ. Here the hippocampal slice preparation was used to investigate the role of chloride transport in these inhibitory responses. In both cell types, increasing the intracellular chloride concentration by injection shifted the reversal potential of these responses in a positive direction, and blocking the outward transport of chloride with furosemide slowed their recovery from the injection. In addition, hyperpolarizing and depolarizing inhibitory responses and the hyperpolarizing and depolarizing responses to the inhibitory neurotransmitter gamma-aminobutyric acid decreased in the presence of furosemide. These effects of furosemide suggest that the internal chloride activity of an individual hippocampal neuron is regulated by two transport processes, one that accumulates chloride and one that extrudes chloride.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Misgeld, U -- Deisz, R A -- Dodt, H U -- Lux, H D -- New York, N.Y. -- Science. 1986 Jun 13;232(4756):1413-5.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2424084" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Biological Transport/drug effects ; Cell Membrane Permeability/drug effects ; Chlorides/*physiology ; Furosemide/pharmacology ; Guinea Pigs ; Hippocampus/*physiology ; In Vitro Techniques ; Ion Channels/drug effects ; Membrane Potentials/drug effects ; *Neural Inhibition ; gamma-Aminobutyric Acid/*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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  • 8
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    A macrophage-derived factor required by plasmacytomas for survival and proliferation in vitro (1986)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1986-08-01
    Description: Plasmacytoma (PCT) cell lines dependent for proliferation and survival on a factor elaborated by the murine macrophage cell line, P388D1, were established in vitro. Adherent peritoneal cells induced by pristane produced 50-fold greater amounts of this activity in vitro than did resident cells. The molecules responsible for plasmacytoma growth were distinct from a number of characterized factors including interleukin-1, -2, and -3, macrophage colony-stimulating factor, B-cell stimulatory factor-1, B-cell growth factor II, epidermal growth factor, transforming growth factor-beta, and gamma- and beta-interferon, none of which were able to support the growth of the factor-dependent PCT cell lines. These results suggest that PCT growth factor may be a novel factor that has not been previously characterized and, further, that its production is associated with the pristane-induced, chronic peritoneal inflammatory response that precedes plasmacytoma formation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Nordan, R P -- Potter, M -- New York, N.Y. -- Science. 1986 Aug 1;233(4763):566-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3726549" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Cell Division/drug effects ; Cell Line ; *Cell Survival/drug effects ; Growth Substances/*isolation & purification/pharmacology/physiology ; Humans ; In Vitro Techniques ; Macrophages/*physiology ; Mice ; Plasmacytoma/*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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  • 9
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    Effect of antibodies to recombinant and synthetic peptides on P. falciparum sporozoites in vitro (1986)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1986-01-10
    Description: Antibodies were raised in mice immunized with several recombinant and synthetic peptides of the circumsporozoite protein of Plasmodium falciparum. The antibodies were evaluated for protective activity in a human hepatocyte culture system. They exerted their protective effect against the parasite at three points: sporozoite attachment to the hepatocyte surface, entry, and subsequent intracellular development. Inhibition of attachment and entry were found to be related to the antibody titer against the authentic circumsporozoite protein on the sporozoite surface, especially when peptides were administered with alum or complete Freund's adjuvant. Even when invasion was not totally inhibited, the presence of abnormal trophozoites and a frequent inhibition of schizont development in long-term cultures suggested continued activity of antibodies at the intracellular level after sporozoite penetration had been completed.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Mazier, D -- Mellouk, S -- Beaudoin, R L -- Texier, B -- Druilhe, P -- Hockmeyer, W -- Trosper, J -- Paul, C -- Charoenvit, Y -- Young, J -- New York, N.Y. -- Science. 1986 Jan 10;231(4734):156-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3510455" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antibodies/*immunology ; Antigens, Protozoan/*immunology ; Fluorescent Antibody Technique ; Humans ; In Vitro Techniques ; Liver/cytology/parasitology ; Mice ; Peptides/immunology ; Plasmodium falciparum/*immunology ; Recombinant Proteins/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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  • 10
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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
    Print ISSN: 0036-8075
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