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  • Kinetics  (15)
  • American Association for the Advancement of Science (AAAS)  (15)
  • 1980-1984  (15)
  • 1984  (3)
  • 1980  (12)
Collection
Keywords
Publisher
  • American Association for the Advancement of Science (AAAS)  (15)
  • Springer  (4)
Years
  • 1980-1984  (15)
Year
  • 1
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    Antibody to spermine: a natural biological constituent (1980)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1980-06-06
    Description: A protein that binds spermine specifically was separated from normal rabbit serum by affinity chromatography. Immunoelectrophoresis, the Ouchterlony immunodiffusion test, and gradient gel electrophoresis indicated that this protein has immunoglobulin characteristics and consists of several populations of antibodies to spermine. These were sequentially released from Sepharose-spermine gel by step-wise elution with solutions ranging in pH from 4 to 1. The binding constants varied from 5.0 x 10(8) to 11.1 x 10(8) liters per mole. These globulins did not react with monoacetylputrescine, L-ornithine, L-lysine, and histamine. Negligible cross-reactivity was detected with spermidine, putrescine, N8-monoacetylspermidine, cadaverine, and diaminopropane. Since perturbations in polyamine metabolism have been identified in several diseases, the study of extracellular polyamine homeostasis may reveal an important regulatory function for this protein.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Bartos, D -- Bartos, F -- Campbell, R A -- Grettie, D P -- Smejtek, P -- New York, N.Y. -- Science. 1980 Jun 6;208(4448):1178-81.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7375929" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antibodies/*isolation & purification ; Binding Sites, Antibody ; Chromatography, Affinity ; Homeostasis ; Immunoglobulin G/isolation & purification ; Kinetics ; Rabbits ; Spermine/*immunology/metabolism
    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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    Chemical mutation of enzyme active sites (1984)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1984-11-02
    Description: New active sites can be introduced into naturally occurring enzymes by the chemical modification of specific amino acid residues with the use of appropriately designed coenzyme analogs. The resultant semisynthetic enzymes can have catalytic activities very different from those of the corresponding native enzymes. For example, papain has been converted into a highly effective oxidoreductase by covalent modification of the sulfhydryl group of the active site cysteine residue (Cys25) with flavins such as 8-bromoacetyl-10-methylisoalloxazine. Thus, it is now possible to enhance the catalytic versatility of existing enzymes through the process of "chemical mutation" of the active site.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kaiser, E T -- Lawrence, D S -- New York, N.Y. -- Science. 1984 Nov 2;226(4674):505-11.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6238407" target="_blank"〉PubMed〈/a〉
    Keywords: Anaerobiosis ; *Binding Sites ; Catalysis ; Chemical Phenomena ; *Chemistry ; Chymotrypsin ; Enzymes/*chemical synthesis ; Flavins ; Kinetics ; NAD/metabolism ; Niacinamide/analogs & derivatives ; Oxidation-Reduction ; Papain ; Stereoisomerism ; Toluene/analogs & derivatives/metabolism
    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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  • 3
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    Benzodiazepine receptor synthesis and degradation by neurons in culture (1984)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1984-11-16
    Description: The benzodiazepine-gamma-aminobutyric acid receptor complex was used to study functional receptor synthesis and degradation in primary cultures of neurons. Fifty percent of the receptors turned over with an unusually rapid half-life (4 hours); this was followed by a second, slower phase (32 hours). These results provide the basis for elucidating the mechanism by which neurons derived from the central nervous system control neurotransmitter receptor number, an important problem in cellular neurobiology. The findings may be of significance in the study of neurological and psychiatric disorders.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Borden, L A -- Czajkowski, C -- Chan, C Y -- Farb, D H -- New York, N.Y. -- Science. 1984 Nov 16;226(4676):857-60.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6093257" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cells, Cultured ; Chick Embryo ; Flunitrazepam/metabolism ; Half-Life ; Kinetics ; Neurons/*metabolism ; Receptors, GABA-A/biosynthesis/*metabolism ; Spinal Cord/cytology ; 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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  • 4
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    Cyclophilin: a specific cytosolic binding protein for cyclosporin A (1984)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1984-11-02
    Description: Cyclophilin, a specific cytosolic binding protein responsible for the concentration of the immunosuppressant cyclosporin A by lymphoid cells, was purified to homogeneity from bovine thymocytes. Cation-exchange high-performance liquid chromatography resolved a major and minor cyclophilin species that bind cyclosporin A with a dissociation constant of about 2 X 10(-7) moles per liter and specific activities of 77 and 67 micrograms per milligram of protein, respectively. Both cyclophilin species have an apparent molecular weight of 15,000, an isoelectric point of 9.6, and nearly identical amino acid compositions. A portion of the NH2-terminal amino acid sequence of the major species was determined. The cyclosporin A-binding activity of cyclophilin is sulfhydryl dependent, unstable at 56 degrees C and at pH 4 or 9.5, and sensitive to trypsin but not to chymotrypsin digestion. Cyclophilin specifically binds a series of cyclosporin analogs in proportion to their activity in a mixed lymphocyte reaction. Isolation of cyclophilin from the cytosol of thymocytes suggests that the immunosuppressive activity of cyclosporin A is mediated by an intracellular mechanism, not by a membrane-associated mechanism.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Handschumacher, R E -- Harding, M W -- Rice, J -- Drugge, R J -- Speicher, D W -- New York, N.Y. -- Science. 1984 Nov 2;226(4674):544-7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6238408" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Carrier Proteins/*isolation & purification/metabolism ; Cattle ; Chromatography, High Pressure Liquid ; Cyclosporins/*metabolism ; Electrophoresis, Polyacrylamide Gel ; Humans ; Isoelectric Point ; Kinetics ; Lymphocyte Culture Test, Mixed ; Mice ; Molecular Weight ; Peptidylprolyl Isomerase
    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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    Tritiated imipramine binding sites are decreased in platelets of untreated depressed patients (1980)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1980-07-11
    Description: The high-affinity binding of triatiated imipramine to platelet membranes was compared in samples from 16 untreated depressed women and 21 age-matched controls of the same sex. The maximal binding in the depressed group was significantly lower than that of the controls, although the affinity constants were similar. These results suggest that binding of tritiated imipramine in human platelets may represent a biochemical index of depression, possibly reflecting similar changes in the brain.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Briley, M S -- Langer, S Z -- Raisman, R -- Sechter, D -- Zarifian, E -- New York, N.Y. -- Science. 1980 Jul 11;209(4453):303-5.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7384806" target="_blank"〉PubMed〈/a〉
    Keywords: Adult ; Aged ; Blood Platelets/*analysis ; Cell Membrane/metabolism ; Depression/*blood ; Humans ; Imipramine/*blood ; Kinetics ; Middle Aged ; Receptors, Drug/*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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  • 6
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    Excitatory and inhibitory effects of serotonin on sensorimotor reactivity measured with acoustic startle (1980)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1980-07-25
    Description: Serotonin infused into the lateral ventricle in rats produced a dose-dependent depression of the acoustic startle reflex. When infused onto the spinal cord, serotonin produced a dose-dependent increase in startle. Thus the same neurotransmitter can modulate the same behavior in opposite ways, depending on which part of the central nervous system is involved.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Davis, M -- Strachan, D I -- Kass, E -- New York, N.Y. -- Science. 1980 Jul 25;209(4455):521-3.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7394520" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Dose-Response Relationship, Drug ; Kinetics ; Male ; Rats ; Reflex, Acoustic/*drug effects ; Reflex, Startle/*drug effects ; Serotonin/*pharmacology
    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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    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
    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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    Time: a new parameter for kinetic measurements in flow cytometry (1980)
    American Association for the Advancement of Science (AAAS)
    Details
    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
    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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    Effective pulmonary ventilation with small-volume oscillations at high frequency (1980)
    American Association for the Advancement of Science (AAAS)
    Details
    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
    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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    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
    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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