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  • Articles  (136)
  • Kinetics  (136)
  • American Association for the Advancement of Science (AAAS)  (136)
  • American Meteorological Society
  • Annual Reviews
  • 1980-1984  (136)
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  • Chemistry and Pharmacology  (136)
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  • Articles  (136)
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  • American Association for the Advancement of Science (AAAS)  (136)
  • American Meteorological Society
  • Annual Reviews
  • Springer  (23)
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Year
Journal
Topic
  • 101
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    Metkephamid, a systemically active analog of methionine enkephalin with potent opioid alpha-receptor activity (1981)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1981-02-06
    Description: Metkephamid is an analog of methionine enkephalin that retains high affinity for the delta receptor and is a systemically active analgesic. Since it is at least 100 times more potent than morphine as an analgesic when placed directly into the lateral ventricles, and is 30 to 100 times more potent on the delta receptor and yet is roughly equipotent on the mu receptor in vitro, it is concluded that it probably produces analgesia by action on delta receptors as well as, or rather than, on mu receptors. It has less tendency to produce respiratory depression, tolerance, and physical dependence than standard analgesics, and it is presently undergoing clinical trial.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Frederickson, R C -- Smithwick, E L -- Shuman, R -- Bemis, K G -- New York, N.Y. -- Science. 1981 Feb 6;211(4482):603-5.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6256856" target="_blank"〉PubMed〈/a〉
    Keywords: *Analgesics ; Animals ; Brain/*drug effects ; Dose-Response Relationship, Drug ; Endorphins/*pharmacology ; *Enkephalin, Methionine/*analogs & derivatives ; Enkephalins/*pharmacology ; Humans ; Kinetics ; Male ; Mice ; Rats ; Receptors, Opioid/*drug effects ; Structure-Activity Relationship ; Substance-Related Disorders/etiology
    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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  • 102
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    Optical recording of calcium action potentials from growth cones of cultured neurons with a laser microbeam (1981)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1981-06-05
    Description: Simultaneous recordings of calcium action potentials directly from growth cones and from somata of neuroblastoma cells indicated that they could be generated in the neurites at or near growth cones. Growth cone responses were measured with a fluorescent voltage-sensitive dye and a 5-milliwatt helium-neon laser microbeam as a monitoring light source.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Grinvald, A -- Farber, I C -- NS14716/NS/NINDS NIH HHS/ -- New York, N.Y. -- Science. 1981 Jun 5;212(4499):1164-7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7233210" target="_blank"〉PubMed〈/a〉
    Keywords: Action Potentials/drug effects ; Animals ; Calcium/*pharmacology ; Cells, Cultured ; Chickens ; Evoked Potentials/drug effects ; Kinetics ; Lasers ; Microscopy, Fluorescence ; Neurons/drug effects/*physiology
    Print ISSN: 0036-8075
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  • 103
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    Two distinct central serotonin receptors with different physiological functions (1981)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1981-05-15
    Description: Two distinct serotonin (5-hydroxytryptamine) receptors designated serotonin 1 and serotonin 2 bind tritium-labeled serotonin and tritium-labeled spiroperidol, respectively. Drug potencies at serotonin 2 sites, but not at serotonin 1 sites, predict their effects on the "serotonin behavioral syndrome," indicating that serotonin 2 sites mediate these behaviors. The limited correlation of drug effects with regulation by guanine nucleotides suggests that serotonin 1 sites might be linked to adenylate cyclase. Drug specificities of serotonin-elicited synaptic inhibition and excitation may reflect serotonin 1 and serotonin 2 receptor interactions, respectively.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Peroutka, S J -- Lebovitz, R M -- Snyder, S H -- DA-00074/DA/NIDA NIH HHS/ -- New York, N.Y. -- Science. 1981 May 15;212(4496):827-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7221567" target="_blank"〉PubMed〈/a〉
    Keywords: Adenylyl Cyclases/metabolism ; Animals ; Behavior, Animal/*physiology ; Brain/*physiology ; Guanine Nucleotides/physiology ; Kinetics ; Male ; Rats ; Receptors, Serotonin/*physiology ; Serotonin/metabolism ; Spiperone/metabolism ; Structure-Activity Relationship
    Print ISSN: 0036-8075
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  • 104
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    Intestinal diffusion barrier: unstirred water layer or membrane surface mucous coat? (1981)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1981-12-11
    Description: The dimensions of the small intestinal diffusion barrier interposed between luminal nutrients and their membrane receptors were determined from kinetic analysis of substrate hydrolysis by integral surface membrane enzymes. The calculated equivalent thickness of the unstirred water layer was too large to be compatible with the known dimensions of rat intestine. The discrepancy could be reconciled by consideration of the mucous coat overlying the intestinal surface membrane. Integral surface membrane proteins could not be labeled by an iodine-125 probe unless the surface coat was first removed. The mucoprotein surface coat appears to constitute an important diffusion barrier for nutrients seeking their digestive and transport sites on the outer intestinal membrane.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Smithson, K W -- Millar, D B -- Jacobs, L R -- Gray, G M -- AM 05418/AM/NIADDK NIH HHS/ -- AM 11270/AM/NIADDK NIH HHS/ -- AM 15802/AM/NIADDK NIH HHS/ -- New York, N.Y. -- Science. 1981 Dec 11;214(4526):1241-4.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7302593" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Membrane/*metabolism ; Diffusion ; Disaccharides/metabolism ; *Intestinal Absorption ; Jejunum/*metabolism/ultrastructure ; Kinetics ; Male ; Microscopy, Electron ; Microvilli/*metabolism/ultrastructure ; Rats ; Rats, Inbred Strains
    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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  • 105
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    Experimental hepatic encephalopathy: changes in the binding of gamma-aminobutyric acid (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1982-04-23
    Description: Two populations of receptors for gamma-aminobutyric acid, one with low- and the other with high-affinity characteristics, are detectable in frozen, thawed, Triton-treated synaptic membrane preparations from normal brain. It is now reported that membrane preparations from rats with mild galactosamine-induced hepatic encephalopathy show an increase in the number of low- and high-affinity gamma-aminobutyric acid binding sites, whereas those from rats with severe encephalopathy show only high-affinity binding sites. Thus, hepatic encephalopathy appears to involve partial degeneration of the gamma-aminobutyric acid-containing presynaptic nerve terminals.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Baraldi, M -- Zeneroli, Z L -- New York, N.Y. -- Science. 1982 Apr 23;216(4544):427-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6280279" target="_blank"〉PubMed〈/a〉
    Keywords: Bicuculline/metabolism ; Binding, Competitive ; Brain/*metabolism ; Disease Models, Animal ; Galactosamine ; Hepatic Encephalopathy/*metabolism ; Humans ; Kinetics ; Receptors, Cell Surface/*metabolism ; Receptors, GABA-A ; Synaptic Membranes/metabolism ; Time Factors ; gamma-Aminobutyric Acid/*metabolism
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 106
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    DNA strand breakage in human leukocytes exposed to a tumor promoter, phorbol myristate acetate (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1982-03-05
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Birnboim, H C -- New York, N.Y. -- Science. 1982 Mar 5;215(4537):1247-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6276978" target="_blank"〉PubMed〈/a〉
    Keywords: Cell Survival/drug effects ; Cells, Cultured ; Cocarcinogenesis ; *Dna ; Free Radicals ; Humans ; Kinetics ; Leukocytes/*drug effects ; Oxygen Consumption/drug effects ; Phorbols/*pharmacology ; Superoxides/metabolism ; Tetradecanoylphorbol Acetate/*pharmacology
    Print ISSN: 0036-8075
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  • 107
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    Endotoxin-stimulated opioid peptide secretion: two secretory pools and feedback control in vivo (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1982-08-27
    Description: Small doses of endotoxin evoked a dramatic biphasic response of opioid peptide secretion into blood in sheep. The first phase began within minutes and coincided with a brief hypertensive response to endotoxin well before the appearance of fever or hypotension. The ratio of beta-endorphin to beta-lipotropin fell abruptly at the onset of the second phase of release, suggesting early depletion of a pool rich in beta-endorphin and subsequent emergence of a pool rich in unprocessed precursor. The concentration of cerebrospinal fluid opioids increased tenfold during the second phase. Naloxone administration augmented endotoxin-induced opioid secretion in both early and late phases, suggesting a short-loop feedback regulation of stress-induced endorphin secretion.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Carr, D B -- Bergland, R -- Hamilton, A -- Blume, H -- Kasting, N -- Arnold, M -- Martin, J B -- Rosenblatt, M -- AM 07028-06/AM/NIADDK NIH HHS/ -- AM 26252/AM/NIADDK NIH HHS/ -- New York, N.Y. -- Science. 1982 Aug 27;217(4562):845-8.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6285473" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Blood Pressure/drug effects ; Endorphins/blood/cerebrospinal fluid/*secretion ; Endotoxins/*pharmacology ; Escherichia coli ; Feedback ; Kinetics ; Naloxone/pharmacology ; Peptide Fragments/blood/cerebrospinal fluid ; Sheep ; beta-Endorphin
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  • 108
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    Reproducing results (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1982-07-02
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kark, P -- New York, N.Y. -- Science. 1982 Jul 2;217(4554):6.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7089541" target="_blank"〉PubMed〈/a〉
    Keywords: *Ethics ; Friedreich Ataxia/enzymology ; Humans ; Kinetics ; *National Institutes of Health (U.S.) ; Pyruvate Dehydrogenase Complex/metabolism ; United States
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  • 109
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    Numbers of receptor sites from Scatchard graphs: facts and fantasies (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1982-09-24
    Description: Data for ligand and receptor binding presented in the format of a Scatchard graph are compared with the same data shown as bound ligand plotted against the logarithm of free ligand. From this comparison it is apparent that extrapolations in the Scatchard graph to yield total number of receptor sites are generally not correct.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Klotz, I M -- New York, N.Y. -- Science. 1982 Sep 24;217(4566):1247-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6287580" target="_blank"〉PubMed〈/a〉
    Keywords: Kinetics ; Ligands/metabolism ; Receptors, Cell Surface/*metabolism ; Statistics as Topic/*methods
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  • 110
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    Corticotropin-releasing factor stimulates accumulation of adenosine 3', 5'-monophosphate in rat pituitary corticotrophs (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1982-05-28
    Description: The presence of synthetic ovine corticotropin-releasing factor leads to a rapid and marked stimulation of adenosine 3', 5'-monophosphate accumulation in an enriched population of rat pituitary corticotrophs in primary culture. The increase, observed as early as 60 seconds after the addition of corticotropin-releasing factor, suggests that changes in the intracellular concentration of the cyclic nucleotide coincide with or precede the secretion of adrenocorticotropic hormone in response to corticotropin-releasing factor.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Labrie, F -- Veilleux, R -- Lefevre, G -- Coy, D H -- Sueiras-Diaz, J -- Schally, A V -- New York, N.Y. -- Science. 1982 May 28;216(4549):1007-8.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6281886" target="_blank"〉PubMed〈/a〉
    Keywords: Adrenocorticotropic Hormone/*secretion ; Animals ; Corticotropin-Releasing Hormone/*pharmacology ; Cyclic AMP/*metabolism ; Female ; Kinetics ; Pituitary Gland, Anterior/*drug effects/*metabolism ; Rats
    Print ISSN: 0036-8075
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  • 111
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    Are ions involved in the gating of calcium channels? (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1982-10-08
    Description: The rates of activation and deactivation of the currents carried by calcium, strontium, or barium ions through the voltage-sensitive calcium channel of Paramecium are different. The differences cannot be attributed to complications due to internal ion concentration, calcium channel inactivation, potassium current activation, surface charge effects, or incomplete space clamping. The findings indicate participation of the divalent cations in the voltage-driven calcium channel gating process.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Saimi, Y -- Kung, C -- GM22714/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1982 Oct 8;218(4568):153-6.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6289432" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Barium/metabolism ; Calcium/*metabolism ; Cell Membrane/physiopathology ; Ion Channels/*metabolism ; Kinetics ; Membrane Potentials ; Paramecium/*physiology ; Strontium/metabolism
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  • 112
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    beta, gamma-Peroxy analogs of adenosine and guanosine triphosphate: synthesis and biological activity (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1982-01-01
    Description: Extended analogs of adenosine triphosphate (ATP) and guanosine triphosphate (GTP), in which a peroxide bridge replaces the terminal bridge-oxygen of the triphosphate chain, have been synthesized. The ability of beta, gamma-peroxy-ATP to inhibit or substitute for ATP in representative enzyme systems and that of beta, gamma-peroxy-GTP, for FTP in protein synthesis was tested.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Rosendahl, M S -- Leonard, N J -- GM-05829/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1982 Jan 1;215(4528):81-2.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7053563" target="_blank"〉PubMed〈/a〉
    Keywords: Adenosine Triphosphate/*analogs & derivatives/chemical synthesis/metabolism ; Guanosine Triphosphate/*analogs & derivatives/chemical synthesis/metabolism ; Kinetics ; Peroxides ; Protein Biosynthesis/drug effects ; Structure-Activity Relationship
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  • 113
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    Tritiated imipramine binding sites are decreased in the frontal cortex of suicides (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1982-06-18
    Description: Binding characteristics of tritiated imipramine were determined in the frontal cortex of suicides and well-matched controls. Maximal binding was significantly lower in brains from the suicides. This finding is consistent with reports of decreased tritiated imipramine binding in the platelets of patients diagnosed as having a major affective disorder.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Stanley, M -- Virgilio, J -- Gershon, S -- New York, N.Y. -- Science. 1982 Jun 18;216(4552):1337-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7079769" target="_blank"〉PubMed〈/a〉
    Keywords: Adolescent ; Adult ; *Carrier Proteins ; Cerebral Cortex/*metabolism ; Humans ; Imipramine/*metabolism ; Kinetics ; Middle Aged ; Receptors, Drug/*metabolism ; Reference Values ; *Suicide ; Tritium
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  • 114
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    Biotin enhances guanylate cyclase activity (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1982-06-18
    Description: Biotin and its analog, (+)-biotin-p-nitrophenyl ester enhanced guanylate cyclase activity two- to threefold in rat liver, kidney, colon, cerebellum, and heart. Dose-response relationships revealed that at concentrations as low as 1 micromolar, both biotin and its analog caused maximal augmentation of guanylate cyclase activity. These data suggest a role for the activation of guanylate cyclase in the mechanism of action of this vitamin.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Vesely, D L -- New York, N.Y. -- Science. 1982 Jun 18;216(4552):1329-30.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6123152" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Biotin/analogs & derivatives/*pharmacology ; Cerebellum/enzymology ; Colon/enzymology ; Guanylate Cyclase/*metabolism ; Kidney/enzymology ; Kinetics ; Liver/enzymology ; Myocardium/enzymology ; Rats ; Rats, Inbred Strains
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  • 115
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    Myosin light chain phosphorylation does not modulate cross-bridge cycling rate in mouse skeletal muscle (1983)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1983-06-10
    Description: An attempt was made to determine whether phosphorylation of the myosin light chain represents a thick filament-associated mechanism for modulating the rate of cross-bridge cycling in mouse skeletal muscle. When the degree of light chain phosphorylation was varied independently of tetanus duration, there was no correlation of phosphorylation with cross-bridge turnover rate, as measured by the shortening velocity of the muscle. It is concluded that in intact skeletal muscle phosphorylation of the myosin light chain does not in itself modulate cross-bridge cycling rate and that previously reported changes in cycling rate were due to other factors that may vary with tetanus duration.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Butler, T M -- Siegman, M J -- Mooers, S U -- Barsotti, R J -- AM 00973/AM/NIADDK NIH HHS/ -- HL 15835/HL/NHLBI NIH HHS/ -- New York, N.Y. -- Science. 1983 Jun 10;220(4602):1167-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6857239" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Kinetics ; Mice ; Muscle Contraction ; Muscles/*metabolism/physiology ; Myosins/*metabolism/physiology ; Phosphorylation ; Rats
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  • 116
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    Sex differences in serotonin 1 receptor binding in rat brain (1983)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1983-10-21
    Description: Male and female rats exhibit sex differences in binding by serotonin 1 receptors in discrete areas of the brain, some of which have been implicated in the control of ovulation and of gonadotropin release. The sex-specific changes in binding, which occur in response to the same hormonal (estrogenic) stimulus, are due to changes in the number of binding sites. Castration alone also affects the number of binding sites in certain areas. The results lead to the conclusion that peripheral hormones modulate binding by serotonin 1 receptors. The status of the serotonin receptor system may affect the reproductive capacity of an organism and may be related to sex-linked emotional disturbances in humans.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Fischette, C T -- Biegon, A -- McEwen, B S -- AM06122/AM/NIADDK NIH HHS/ -- NS06080/NS/NINDS NIH HHS/ -- New York, N.Y. -- Science. 1983 Oct 21;222(4621):333-5.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6623080" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Brain/*metabolism ; Brain Mapping ; Castration ; Cell-Free System ; Estradiol/*pharmacology ; Female ; Glucosephosphate Dehydrogenase/metabolism ; Kinetics ; Male ; Pituitary Gland/enzymology ; Rats ; Receptors, Serotonin/drug effects/*metabolism ; *Sex Factors
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  • 117
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    Salt-induced conversion of B-DNA to Z-DNA inhibited by aflatoxin B1 (1983)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1983-03-25
    Description: The carcinogen aflatoxin B1 was reacted with a polymer of alternating deoxyguanine and deoxycytosine residues to determine the effect that adduct formation has on the conversion of this polymer from the right-handed B-DNA form found at low salt concentrations to the left-handed Z-DNA form found at high salt concentrations. Reaction with aflatoxin strongly inhibited the salt-induced conversion of this polymer from B-DNA to Z-DNA. This inhibition could be detected even at relatively low binding levels.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Nordheim, A -- Hao, W M -- Wogan, G N -- Rich, A -- New York, N.Y. -- Science. 1983 Mar 25;219(4591):1434-6.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6402818" target="_blank"〉PubMed〈/a〉
    Keywords: Aflatoxin B1 ; Aflatoxins/*pharmacology ; Circular Dichroism ; DNA/*metabolism ; Kinetics ; Nucleic Acid Conformation ; Osmolar Concentration ; Sodium Chloride/pharmacology
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    Insulin receptors in hepatocytes: postreceptor events mediate down regulation (1980)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1980-11-28
    Description: Down regulation of the insulin receptor of primary cultures of rat hepatocytes occurs in the presence of insulin and several agents with insulin-like activity, which act through or distal to the insulin receptor. These findings indicate that the interaction of insulin with its specific binding site is not in itself sufficient to down-regulate this receptor and that one or more steps subsequent to this interaction are necessary. Thus, down regulation may be a complex biological response to insulin, and if a cell were resistant to this effect of insulin, our data may explain how target cells from a patient or animal can have a normal number of receptors in the presence of increased concentrations of circulating insulin.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Caro, J F -- Amatruda, J M -- AM 00366/AM/NIADDK NIH HHS/ -- AM 20948/AM/NIADDK NIH HHS/ -- New York, N.Y. -- Science. 1980 Nov 28;210(4473):1029-31.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7001632" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Insulin/metabolism ; Kinetics ; Liver/*metabolism ; Male ; Peroxides/pharmacology ; Rats ; Receptor, Insulin/drug effects/immunology/*metabolism ; Spermine/pharmacology ; Vitamin K/pharmacology
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    1 alpha, 25-Dihydroxyvitamin D3 nuclear receptors in pituitary (1980)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1980-09-12
    Description: Specific binding of 1 alpha,25-dihydroxyvitamin D(3) was found in nuclear and cytosol fractions of the bovine pituitary. For nuclear binding. the dissociation constant was 0.1 namomole per liter, and maximum binding was 104 femtomoles per milligram of protein. In competition studies, 25-hydroxyvitamin D(3) was 300 times weaker than 1 alpha,25-dihydroxyvitamin D(3). The existence of high-affinity sites supports a physiologic role for 1 alpha,25-dihydroxyvitamin D(3) in the pituitary.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Gelbard, H A -- Stern, P H -- U'Prichard, D C -- New York, N.Y. -- Science. 1980 Sep 12;209(4462):1247-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6250221" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Brain/metabolism ; Cattle ; Cell Nucleus/metabolism ; Cholecalciferol/*metabolism ; Cytosol/metabolism ; Dihydroxycholecalciferols/*metabolism ; Hydroxycholecalciferols/*metabolism ; Kinetics ; Pituitary Gland/*metabolism/ultrastructure ; Receptors, Drug/*metabolism
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    Time: a new parameter for kinetic measurements in flow cytometry (1980)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1980-01-11
    Description: The measure of time was used as an additional parameter on an existing flow cytometer to study the kinetics of enzyme activities and cell-stain interactions. By correlating all fluorescent signals from single cells with time, the dynamics of a reaction can be followed for several minutes. This advanced application of flow cytometry is easily implemented and can be incorporated into any flow cytometer that has two-parameter analysis capability.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Martin, J C -- Swartzendruber, D E -- New York, N.Y. -- Science. 1980 Jan 11;207(4427):199-201.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6153131" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Line ; Cells, Cultured/enzymology ; Computers ; Cricetinae ; *Cytological Techniques ; DNA/metabolism ; Esterases/metabolism ; Kinetics ; Mice ; Spectrometry, Fluorescence/methods ; Staining and Labeling
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    Effective pulmonary ventilation with small-volume oscillations at high frequency (1980)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1980-08-01
    Description: At high oscillation frequencies (4 to 30 hertz), effective alveolar ventilation can be achieved with tidal volumes much smaller than the anatomic dead space. An explanation of this phenomenon is given in terms of the combined effects of diffusion and convection and in terms of data consistent with the hypothesis. Theory and experimental results both show that the significant variable determining the effectiveness of gas exchange is the amplitude of the oscillatory flow rate independent of the individual values of frequency and stroke volume.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Slutsky, A S -- Drazen, F M -- Ingram, R H Jr -- Kamm, R D -- Shapiro, A H -- Fredberg, J J -- Loring, S H -- Lehr, J -- New York, N.Y. -- Science. 1980 Aug 1;209(4456):609-71.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6771872" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Carbon Dioxide/metabolism ; Diffusion ; Dogs ; Kinetics ; Mathematics ; Oscillometry ; Pulmonary Alveoli/*physiology ; *Respiration
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    Endocytotic sucrose uptake in Amoeba proteus induced with the calcium ionophore A23187 (1980)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1980-08-08
    Description: The calcium ionophore A23187 brings about an influx of calcium and uptake of sucrose by endocytosis in Amoeba proteus. The amount of endocytotic sucrose uptake elicited by the ionophore depends upon the external calcium ion concentration. Calcium ion movements may serve to couple the surface phase of endocytosis with cytoplasmic uptake of the endocytotic inducer.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Prusch, R D -- New York, N.Y. -- Science. 1980 Aug 8;209(4457):691-2.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6771873" target="_blank"〉PubMed〈/a〉
    Keywords: Amoeba/drug effects/*metabolism ; Animals ; Anti-Bacterial Agents/*pharmacology ; Biological Transport/drug effects ; Calcimycin/*pharmacology ; Calcium/metabolism ; Endocytosis/*drug effects ; Kinetics ; Sucrose/*metabolism
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    Niemann-Pick disease: a genetic model in Siamese cats (1980)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1980-06-27
    Description: Three Siamese cats were found to have a progressive neurological disease that became obvious when they were 4 to 5 months of age. Their brains contained an excess of GM2 and GM3 gangliosides, and their livers a nine- to tenfold excess of sphingomyelin and cholesterol. A total deficiency of lysosomal (pH 5.0) sphingomyelinase was found in the leukocytes, liver, and brain of the cats, although the activity of the microsomal (pH 7.4, magnesium-dependent) sphingomyelinase was normal in brain. These cats appear to have a genetic disease identical to Niemann-Pick disease type A.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wenger, D A -- Sattler, M -- Kudoh, T -- Snyder, S P -- Kingston, R S -- New York, N.Y. -- Science. 1980 Jun 27;208(4451):1471-3.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7189903" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Brain/enzymology ; Brain Chemistry ; Cat Diseases/enzymology/*genetics ; Cats ; *Disease Models, Animal ; Gangliosides/analysis ; Humans ; Kinetics ; Liver/analysis ; Niemann-Pick Diseases/enzymology/*genetics ; Phospholipids/analysis ; Sphingomyelin Phosphodiesterase/analysis
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    Sodium-calcium exchange in rabbit heart muscle cells: direct measurement of sarcoplasmic Ca2+ activity (1980)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1980-08-08
    Description: Calcium ion-selective microelectrodes made with Simon's neutral carrier were used to measure simultaneously sarcoplasmic Ca2+ activity (aiCa) and resting tension (Tr) of rabbit ventricular muscle during reduction and restoration of external sodium ion concentration, [Na]0. Under the same experimental conditions the change in contractile tension (Ta) also measured. In resting muscle the aiCa was 38 +/- 17 nanomolar (mean +/- standard deviation; N = 10). The reduction of [Na]O from 153 to 20 millimolar led to about a threefold increase in aiCa with parallel increases in Tr and Ta. The time course of the change in aiCa was similar to that of the changes in Tr and Ta. The results are consistent with an important role of the sodium-calcium exchange system for regulating sarcoplasmic Ca2+ activity.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lee, C O -- Uhm, D Y -- Dresdner, K -- New York, N.Y. -- Science. 1980 Aug 8;209(4457):699-701.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7394527" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Biological Transport/drug effects ; Calcium/*metabolism ; Heart Ventricles/metabolism ; Kinetics ; Membrane Potentials/drug effects ; Microelectrodes ; Myocardium/*metabolism ; Rabbits ; Sarcoplasmic Reticulum/drug effects/*metabolism ; Sodium/*metabolism/pharmacology
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    Neuronal control of acetylcholine receptor turnover rate at a vertebrate neuromuscular junction (1980)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1980-10-31
    Description: The turnover rate of acetylcholine receptors at neuromuscular junctions in mice increases progressively after denervation and, after 15 days, reaches a half-time of 30 z 5 hours. Denervation thus causes the clustered junctional acetylcholine receptors to assume the rapid turnover characteristic of extrajunctional receptors before innervation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Levitt, T A -- Loring, R H -- Salpeter, M M -- NS 09315-10/NS/NINDS NIH HHS/ -- New York, N.Y. -- Science. 1980 Oct 31;210(4469):550-1.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7423205" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Bungarotoxins/metabolism ; Kinetics ; Mice ; Motor Neurons/*physiology ; Muscle Denervation ; Neuromuscular Junction/*metabolism ; Receptors, Cholinergic/*metabolism ; Receptors, Nicotinic/metabolism
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    Lactate dehydrogenases of Atlantic hagfish: physiological and evolutionary implications of a primitive heart isozyme (1980)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1980-02-15
    Description: Isozymes of lactate dehydrogenase from heart and muscle of Atlantic hagfish show less functional divergence than those from other fishes and higher vertebrates. The enzyme from hagfish heart (B4) displays a higher Michaelis constant for pyruvate and lower substrate inhibition at moderate pyruvate concentrations than heart isozymes from other species. These properties support the hypothesis that the ancestral vertebrate lactate dehydrogenase was a muscle (A4)-type enzyme and also suggest a role for the B4 enzyme in the unusual physiology of hagfish cardiac tissue which functions under sustained hypoxic conditions.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sidell, B D -- Beland, K F -- New York, N.Y. -- Science. 1980 Feb 15;207(4432):769-70.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7352286" target="_blank"〉PubMed〈/a〉
    Keywords: Anaerobiosis ; Animals ; *Biological Evolution ; Energy Metabolism ; Fishes/genetics/*physiology ; Genes ; Isoenzymes ; Kinetics ; L-Lactate Dehydrogenase/*genetics/metabolism ; Muscles/*enzymology ; Myocardium/enzymology ; Pyruvates/metabolism
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    Sodium-calcium exchange activity generates a current in cardiac membrane vesicles (1980)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1980-06-27
    Description: Sarcolemmal membrane vesicles isolated from canine ventricular tissue accumulate calcium through the sodium-calcium exchange system when an outwardly directed sodium gradient is generated across the vesicle membrane. Moreover, calcium uptake under these conditions is accompanied by the transient accumulation of the lipophilic cation tetraphenylphosphonium. Since the distribution of tetraphenylphosphonium across biological membranes reflects the magnitude and direction of transmembrane potential differences and the characteristics of the transient accumulation of this cation closely resemble those of sodium-calcium exchange activity, it is concluded that a membrane potential, interior negative, is produced during calcium accumulation through the exchange system. Thus, the operation of the sodium-calcium exchange system generates a current in cardiac membrane vesicles, suggesting that three or more sodium ions exchange for each calcium ion.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Reeves, J P -- Sutko, J L -- New York, N.Y. -- Science. 1980 Jun 27;208(4451):1461-4.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7384788" target="_blank"〉PubMed〈/a〉
    Keywords: Biological Transport, Active/drug effects ; Calcium/*metabolism ; Carbonyl Cyanide m-Chlorophenyl Hydrazone/pharmacology ; Cell Membrane/drug effects/*metabolism ; Heart/*physiology ; Kinetics ; Membrane Potentials/drug effects ; Myocardium/*metabolism ; Onium Compounds/metabolism ; *Organophosphorus Compounds ; Sodium/*metabolism ; Valinomycin/pharmacology
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    N-Formylmethionyl peptide receptors on equine leukocytes initiate secretion but not chemotaxis (1980)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1980-07-25
    Description: The chemotaxis of leukocytes appears to be initiated by the binding of chemotactic factors to the surface of these cells. N-Formylated peptides induce chemotaxis and lysosomal enzyme secretion of leukocytes; because these peptides are available in a purified radiolabeled form, they have been useful in the characterization of receptors for chemotactic factors. Equine polymorphonuclear leukocytes secrete lysosomal enzymes but do not exhibit chemotaxis in respone to the N-formylated peptides, even though they have a high-affinity cell surface receptor for these agents. The specificity of the equine receptor resembles the specificity of the receptor on chemotactically responsive leukocytes from other species. Equine polymorphonuclear leukocytes may thus be an excellent model for the study of the events that lead to a biological response following receptor occupancy.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Snyderman, R -- Pike, M C -- New York, N.Y. -- Science. 1980 Jul 25;209(4455):493-5.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6248959" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Chemotaxis ; Horses ; Kinetics ; Leukocytes/*physiology/secretion ; Oligopeptides/blood/*physiology ; Receptors, Cell Surface/*physiology ; Receptors, Formyl Peptide ; Structure-Activity Relationship
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    Antiallergic drug cromolyn may inhibit histamine secretion by regulating phosphorylation of a mast cell protein (1980)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1980-01-04
    Description: Cromolyn inhibited histamine release from mast cells that was induced by a classic secretagogue and correspondingly increased incorporation of radioactive phosphate into a 78,000-dalton protein. These effects on histamine secretion and on protein phosphorylation were rapid in onset and both showed tachyphylaxis. Cromolyn may therefore act by altering the phosphorylation of a protein involved in the regulation of secretion.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Theoharides, T C -- Sieghart, W -- Greengard, P -- Douglas, W W -- New York, N.Y. -- Science. 1980 Jan 4;207(4426):80-2.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6153130" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Calcium/physiology ; Cromolyn Sodium/*pharmacology ; Histamine Release/*drug effects ; Kinetics ; Mast Cells/*drug effects/immunology/metabolism ; Molecular Weight ; Phosphoproteins/*metabolism ; Phosphorylation ; Rats ; p-Methoxy-N-methylphenethylamine/antagonists & inhibitors
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    Energy requirement for nitrogen fixation in actinorhizal and legume root nodules (1980)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1980-07-11
    Description: The ratio of respiration to nitrogenase activity was measured in five species of actinorhizal root nodules and eight species of legume nodules. The two types of nodules could not be distinguished on the basis of this ratio; this evidence thus indicates that the energy cost of nitrogen fixation is similar for both.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Tjepkema, J D -- Winship, L J -- New York, N.Y. -- Science. 1980 Jul 11;209(4453):279-81.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7384801" target="_blank"〉PubMed〈/a〉
    Keywords: Actinomycetales/metabolism ; Kinetics ; *Nitrogen Fixation ; Plants/*metabolism ; Rhizobium/metabolism ; Species Specificity
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    Cholecystokinin receptors in the brain: characterization and distribution (1980)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1980-06-06
    Description: Specific cholecystokinin binding sites in particulate fractions of rat brain were measured with iodine 125-labeled Bolton-Hunter cholecystokinin, a cholecystokinin analog that has full biological activity. Binding was detected in brain regions known to contain immunoreactive cholecystokinin. Binding was saturable, reversible, of high affinity (dissociation constant, 1.7 x 10(-9) M), and was inhibited by cholecystokinin analogs but not by unrelated hormones.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Saito, A -- Sankaran, H -- Goldfine, I D -- Williams, J A -- New York, N.Y. -- Science. 1980 Jun 6;208(4448):1155-6.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6246582" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Binding, Competitive ; Brain/*metabolism ; Brain Mapping ; Cerebral Cortex/metabolism ; Cholecystokinin/*metabolism ; Gastrins/metabolism ; Kinetics ; Male ; Olfactory Bulb/metabolism ; Pancreas/metabolism ; Rats ; Receptors, Cell Surface/*metabolism
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    Production of an epidermal growth factor receptor-related protein (1984)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1984-04-20
    Description: Human epidermoid carcinoma A431 cells in culture produce a soluble 105-kilodalton protein which, by the criteria of epidermal growth factor (EGF) binding, recognition by monoclonal and polyclonal antibodies to the EGF receptor, amino-terminal sequence analysis and carbohydrate content, is related to the cell surface domain of the EGF receptor. The high rate of production and the finding that with biosynthetic labeling the specific activity of this 105-kilodalton protein exceeds that of the intact receptor indicate that it is not derived from membrane-bound mature receptor but is separately produced by the cell. These cells thus separately synthesize an EGF receptor that is inserted into the membrane and an EGF receptor-related protein that is secreted.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Weber, W -- Gill, G N -- Spiess, J -- AM13149/AM/NIADDK NIH HHS/ -- New York, N.Y. -- Science. 1984 Apr 20;224(4646):294-7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6324343" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Antibodies, Monoclonal/immunology ; Carbohydrates/analysis ; Carcinoma, Squamous Cell/*metabolism ; Cell Line ; Epidermal Growth Factor/metabolism ; Glycoproteins/analysis/*biosynthesis ; Humans ; Kinetics ; Molecular Weight ; Receptor, Epidermal Growth Factor ; Receptors, Cell Surface/analysis/immunology/metabolism
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    Modulation of the metastatic activity of melanoma cells by laminin and fibronectin (1984)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1984-11-23
    Description: Metastatic mouse melanoma cells have a high affinity for the basement membrane and the ability to degrade it; these properties may allow tumor cells to invade the membrane and disseminate. In this study it was found that the metastatic potential of mouse melanoma cells varied when the cells were exposed in culture to fibronectin or laminin. After removal of fibronectin or exposure to laminin, the cells had an increased affinity for basement membrane collagen, were more invasive of basement membranes in vitro, and produced more lung colonies in vivo. These changes are correlated with and may be due to an increase in the laminin-binding capacity of the tumor cell surface.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Terranova, V P -- Williams, J E -- Liotta, L A -- Martin, G R -- New York, N.Y. -- Science. 1984 Nov 23;226(4677):982-5.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6505678" target="_blank"〉PubMed〈/a〉
    Keywords: Amnion/physiology ; Animals ; Cell Division/drug effects ; Cell Line ; Female ; Fibronectins/*pharmacology ; Humans ; Immune Sera ; Kinetics ; Laminin/*pharmacology ; Melanoma/*pathology ; Mice ; Neoplasm Metastasis/*pathology ; Pregnancy
    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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  • 134
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    Virus like sensitivity of the scrapie agent to heat inactivation (1984)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1984-02-10
    Description: The resistance of the infectious agent of scrapie disease to sterilization at 100 degrees or 121 degrees C is reputed to be inconsistent with the structure of conventional viruses. However, in kinetic studies the majority of hamster scrapie strain 263K infectivity was (like that of previously characterized viruses) rapidly inactivated at temperatures of 100 degrees C or greater. Small resistant subpopulations remained. Similar heat-resistant subpopulations were observed at 60 degrees C for phage lambda but only in the presence of brain homogenate. Brain homogenate may also confer stability to small subfractions of scrapie infectivity. Such refractory subpopulations cannot be used to make structural inferences that are properly obtained from the behavior of the majority population as revealed in the initial inactivation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Rohwer, R G -- New York, N.Y. -- Science. 1984 Feb 10;223(4636):600-2.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6420887" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Brain/microbiology ; Cricetinae ; *Hot Temperature ; Kinetics ; Prions/*growth & development ; Species Specificity ; Sterilization/methods
    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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  • 135
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    Labeled putrescine as a probe in brain tumors (1983)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1983-08-12
    Description: The polyamine metabolism of transplanted N-nitrosomethylurea-derived rat glioma was determined with radiolabeled putrescine used as a marker for malignancy. The uptake of putrescine in vivo was complete within 5 minutes and was specific for tumor tissue. The conversion of putrescine to spermine and other metabolites by the tumor was rapid, in contrast to the case for adjacent normal brain. These results suggest that putrescine labeled with carbon-11 may be used as a positron-emission tomographic tracer for the selective metabolic imaging of brain tumor and may be used in an appropriate model as a marker for tumor growth rate.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Volkow, N -- Goldman, S S -- Flamm, E S -- Cravioto, H -- Wolf, A P -- Brodie, J D -- NS15638/NS/NINDS NIH HHS/ -- S07RR05399/RR/NCRR NIH HHS/ -- New York, N.Y. -- Science. 1983 Aug 12;221(4611):673-5.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6603020" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Autoradiography ; Brain Neoplasms/*radionuclide imaging ; Glioma/radionuclide imaging ; Kinetics ; Neoplasm Transplantation ; *Putrescine/metabolism ; Rats ; Tomography, Emission-Computed
    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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  • 136
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    The enzymatic synthesis of 5-amino-4-imidazolecarboxamide riboside triphosphate (ZTP) (1984)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1984-03-16
    Description: 5-Amino-4-imidazolecarboxamide riboside triphosphate (ZTP) is thought to play a regulatory role in cellular metabolism. Unlike other nucleoside triphosphates, ZTP is synthesized in a one-step reaction in which the pyrophosphate group of 5-phosphoribosyl-l-pyrophosphate is transferred to the riboside monophosphate (ZMP) in a reaction catalyzed by 5-phosphoribosyl-l-pyrophosphate synthetase; reversal of this reaction leads to dephosphorylation of ZTP to ZMP. This unusual route of synthesis (and catabolism) of ZTP may be important in defining its metabolic effects in the cell.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sabina, R L -- Holmes, E W -- Becker, M A -- AM12413/AM/NIADDK NIH HHS/ -- AM28554/AM/NIADDK NIH HHS/ -- New York, N.Y. -- Science. 1984 Mar 16;223(4641):1193-5.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6199843" target="_blank"〉PubMed〈/a〉
    Keywords: Adenosine Triphosphate/metabolism ; Aminoimidazole Carboxamide/analogs & derivatives/*biosynthesis/pharmacology ; Animals ; Cell Line ; Cricetinae ; Imidazoles/*biosynthesis ; Kinetics ; Phosphoribosyl Pyrophosphate/metabolism ; Phosphorylation ; Ribonucleosides/pharmacology ; Ribonucleotides/*biosynthesis ; Ribose-Phosphate Pyrophosphokinase/metabolism ; Substrate Specificity
    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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