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  • Articles  (13)
  • Cells, Cultured  (13)
  • Physical Chemistry
  • 1975-1979  (13)
  • Physics  (13)
  • 1
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    Inosine may be an endogenous ligand for benzodiazepine receptors on cultured spinal neurons (1979)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1979-08-17
    Description: Mouse spinal neurons grown in tissue culture were used to study the membrane effects of the benzodiazepine flurazepam and the naturally occurring purine nucleoside inosine, which competes for benzodiazepine receptor sites in the central nervous system. Application of inosine elicited two types of transmitter-like membrane effects: a rapidly desensitizing excitatory response and a nondesensitizing inhibitory response. Flurazepam produced a similar excitatory response which showed cross-desensitization with the purine excitation. Flurazepam also blocked the inhibitory inosine response. The results provide electrophysiological evidence that an endogenous purine can activate two different conductances on spinal neurons and that flurazepam can activate one of the conductances and antagonize the other.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉MacDonald, J F -- Barker, J L -- Paul, S M -- Marangos, P J -- Skolnick, P -- New York, N.Y. -- Science. 1979 Aug 17;205(4407):715-7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/37602" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Benzodiazepines/*metabolism ; Cells, Cultured ; Electric Conductivity ; Flurazepam/antagonists & inhibitors ; Inosine/*metabolism/pharmacology ; Ligands ; Mice ; Neurotransmitter Agents/metabolism ; Receptors, Drug/*metabolism ; Receptors, Neurotransmitter/metabolism ; Spinal Cord/*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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    Specific-opiate-induced depression of transmitter release from dorsal root ganglion cells in culture (1978)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1978-03-31
    Description: The opiate etorphine depresses monosynaptic excitatory postsynaptic potentials (EPSP's) elicited in spinal cord cells by activation of dorsal root ganglion cells in murine neuronal cell culture. The depression is reversed by naloxone. Statistical analysis of the synaptic responses reveals that the opiate reduces EPSP quantal content at this synapse without altering quantal size. Therefore, the opiate action is presynaptic and affects transmitter release rather than postsynaptic responsiveness.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Macdonald, R L -- Nelson, P G -- New York, N.Y. -- Science. 1978 Mar 31;199(4336):1449-51.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/204015" target="_blank"〉PubMed〈/a〉
    Keywords: Cells, Cultured ; Depression, Chemical ; Dose-Response Relationship, Drug ; Etorphine/*pharmacology ; Ganglia, Spinal/*drug effects ; Membrane Potentials/drug effects ; Morphinans/*pharmacology ; Naloxone/pharmacology ; Nerve Endings/drug effects ; Spinal Cord/drug effects ; Synapses/drug effects ; Synaptic Transmission/*drug effects
    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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    Metabolism of theophylline to caffeine in human fetal liver (1979)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1979-12-14
    Description: Caffeine (1,3,7-trimethylxanthine) is a biotransformation product of theophylline (1,3-dimethylxanthine) in the human fetus. Liver explants, obtained from human fetuses with gestational ages of 12 to 20 weeks, were incubated with theophylline and produced caffeine and, in lesser amounts, 1,3-dimethyluric acid and 3-methylxanthine. These findings suggest that the predominant pathway in theophylline metabolism in the fetus and newborn infant is the methylation reaction producing caffeine. This may contribute to the neonate's exceedingly slower elimination of caffeine relative to theophylline. Caffeine produced from theophylline may add to the pharmacologic effects of theophylline in newborn infants with apnea.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Aranda, J V -- Louridas, A T -- Vitullo, B B -- Thom, P -- Aldridge, A -- Haber, R -- New York, N.Y. -- Science. 1979 Dec 14;206(4424):1319-21.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/515734" target="_blank"〉PubMed〈/a〉
    Keywords: Apnea/drug therapy ; Biotransformation ; Caffeine/*biosynthesis/metabolism/therapeutic use ; Cells, Cultured ; Gestational Age ; Humans ; Infant, Newborn ; Liver/*embryology/metabolism ; Methylation ; Theophylline/*metabolism/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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  • 4
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    Specific nonopiate receptors for beta-endorphin (1979)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1979-09-07
    Description: Iodinated beta H-[2-D-alanine]endorphin exhibits specific binding to cultured human lymphocytes. The binding is inhibited by low concentrations of beta-endorphin and its D-alanine derivative, but is not affected by opiate agonists and antagonists, or by enkephalin analogs, beta-lipotropin, adrenocorticotrophic hormone, or alpha-melanocyte-stimulating hormone; this suggests the existence of a specific, non-opiate binding site (receptor) for beta-endorphin. The carboxy-terminal region of beta-endorphin is essential for this binding activity, since alpha-endorphin is not active. beta-Endorphin may be a circulating hormone with peripheral physiological effects that are not primarily mediated through interactions with opiate or enkephalin receptors.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hazum, E -- Chang, K J -- Cuatrecasas, P -- New York, N.Y. -- Science. 1979 Sep 7;205(4410):1033-5.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/224457" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Cells, Cultured ; Endorphins/blood/*metabolism ; Humans ; Lymphocyte Activation ; Lymphocytes/*metabolism ; Receptors, Drug/*metabolism ; Receptors, Opioid/metabolism ; Stress, Physiological/metabolism ; Structure-Activity Relationship
    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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    Deficiencies of glucosamine-6-sulfate or galactosamine-6-sulfate sulfatases are responsible for different mucopolysaccharidoses (1978)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1978-01-06
    Description: [1-3H]Galactitol-6-sulfate, N- [1-3H]acetylgalactosaminitol-6-sulfate, N-[1-3H]acetylglucosaminitol-6-sulfate, N-acetylglucosamine-6-sulfate, and 6-sulfated tetrasaccharides from chondroitin-6-sulfate have been used for the measurement of 6-sulfatase activity of extracts of normal skin fibroblasts and of fibroblasts cultured from patients with genetic mucopolysaccharidoses. With these substrates, extracts of fibroblasts derived from Morquio patients lack or have greatly reduced activities for galactitol-6-sulfate, N-acetylgalactosaminitol-6-sulfate, and 6-sulfated tetrasaccharides but have normal activity for N-acetylglucosamine-6-sulfate and its alditol; those derived from a patient with a newly discovered mucopolysaccharidosis have greatly reduced activity for N-acetylglucosamine-6-sulfate and its alditol but normal activity for galactitol-6-sulfate, N-acetylgalactosaminitol-6-sulfate, and the 6-sulfated tetrasaccharides. These findings demonstrate the existence of two different hexosamine-6-sulfate sulfatases, specific for the glucose or galactose configuration of their substrates. Their respective deficiencies, causing inability to degrade keratan sulfate and heparan sulfate in one case and keratan sulfate and chondroitin-6-sulfate in the other, are responsible for different clinical phenotypes.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Di Ferrante, N -- Ginsberg, L C -- Donnelly, P V -- Di Ferrante, D T -- Caskey, C T -- New York, N.Y. -- Science. 1978 Jan 6;199(4324):79-81.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratories of Connective Tissue Research, Department of Biochemistry, Baylor College of Medicine, Houston, Texas 77030, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17569489" target="_blank"〉PubMed〈/a〉
    Keywords: Acetylgalactosamine/analogs & derivatives/metabolism ; Acetylglucosamine/analogs & derivatives/metabolism ; Cells, Cultured ; Child, Preschool ; Chondroitin Sulfates/metabolism ; Chondroitinsulfatases/*deficiency/metabolism ; Fibroblasts/enzymology ; Galactitol/metabolism ; Heparitin Sulfate/metabolism ; Humans ; Hydrogen-Ion Concentration ; Keratan Sulfate/metabolism ; Male ; Mucopolysaccharidoses/*enzymology ; Mucopolysaccharidosis III/enzymology ; Mucopolysaccharidosis IV/*enzymology ; Skin/cytology/enzymology ; Substrate Specificity ; Sulfatases/*deficiency/metabolism
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  • 6
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    Erythroid progenitors circulating in the blood of adult individuals produce fetal hemoglobin in culture (1978)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1978-03-24
    Description: Erythroid colonies, raised from erythroid stem cells circulating in the peripheral blood of normal adult individuals, synthesize considerable amounts of fetal hemoglobin. In cultures from persons with sickling disorders, amounts of hemoglobin F that are known to inhibit sickling in vivo are produced. The results provide evidence that primitive erythroid progenitors are able to express the hemoglobin F production program and that cultures of mononuclear cells of the adult blood can be used to investigate the mechanisms involved in regulation of gamma-globin gene switching.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Papayannopoulou, T -- Nakamoto, B -- Buckley, J -- Kurachi, S -- Nute, P E -- Stamatoyannopoulos, G -- New York, N.Y. -- Science. 1978 Mar 24;199(4335):1349-50.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/628844" target="_blank"〉PubMed〈/a〉
    Keywords: Adult ; Anemia, Sickle Cell/blood ; Cell Differentiation ; Cells, Cultured ; Fetal Hemoglobin/*biosynthesis ; Hematopoietic Stem Cells/cytology/*metabolism ; Hemoglobin A/biosynthesis ; Hemoglobin, Sickle/biosynthesis ; Humans ; Reticulocytes/metabolism ; Thalassemia/blood
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  • 7
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    Ultraviolet radiation--induced chromosomal abnormalities in fetal fibroblasts from New Zealand black mice (1978)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1978-09-08
    Description: Fibroblasts from New Zealand Black mouse fetuses manifest increased frequency of chromosomal breaks and interchanges after exposure to ultraviolet radiation when compared with cells from BABL/c fetuses. This chromosomal instability is similar to what has been reported in cells from patients with xeroderma pigmentosum and may be related to the chromosomally abnormal clones and malignancy previously reported in adult New Zealand Black mice.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Reddy, A L -- Fialkow, P G -- Salo, A -- New York, N.Y. -- Science. 1978 Sep 8;201(4359):920-2.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/684417" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cells, Cultured ; *Chromosome Aberrations ; Chromosomes/*radiation effects ; Disease Models, Animal ; Dose-Response Relationship, Radiation ; Mice ; Mice, Inbred BALB C/physiology ; Mice, Inbred NZB/*physiology ; *Ultraviolet Rays ; Xeroderma Pigmentosum/physiopathology
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 8
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    Molecular cloning of polyoma virus DNA in Escherichia coli: lambda phage vector system (1979)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1979-03-02
    Description: The biological activity of recombinant phage and recombinant phage DNA containing monomeric or dimeric polyoma DNA inserts was examined in mice and cultured mouse cells. Recombinant preparations containing a single copy of viral DNA were invariably noninfectious; molecules containing a dimeric polyoma DNA insert were at least seven orders of magnitude less infectious than polyoma virions after parenteral inoculation. No infection was detected with any recombinant preparation after oral administration.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Chan, H W -- Israel, M A -- Garon, C F -- Rowe, W P -- Martin, M A -- New York, N.Y. -- Science. 1979 Mar 2;203(4383):887-92.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/217088" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cells, Cultured ; Coliphages/*genetics ; DNA Restriction Enzymes/metabolism ; *DNA, Recombinant ; DNA, Viral/genetics ; Escherichia coli/*genetics ; Mice ; Polyomavirus/*genetics ; Risk ; Tumor Virus Infections/*genetics ; Virus Replication
    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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    Growth of infective forms of Trypanosoma rhodesiense in vitro, the causative agent of African trypanosomiasis (1978)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1978-11-17
    Description: A new approach to the culture of African trypanosomes led to the growth of the infective forms of the causative agent of human African trypanosomiasis. Infective cultures of Trypanosoma rhodesiense were initiated and maintained in vitro on Chinese hamster lung cells. By changing daily one-third of the Hepes-buffered RPMI 1640 medium containing 20 percent fetal bovine serum, the trypanosome numbers increased to 3 X 10(6) to 5 X 10(6) cells per milliliter. After 80 days in vitro at 37 degrees C, the cultured trypomastigotes are infective for mice and rats and morphologically similar to bloodstream trypomastigotes in having a subterminal kinetoplast and a surface coat. In addition, they possess L-alpha-glycerophosphate oxidase, the predominant steady-state terminal oxidase of bloodstream trypomastigotes.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hill, G C -- Shimer, S P -- Caughey, B -- Sauer, L S -- New York, N.Y. -- Science. 1978 Nov 17;202(4369):763-5.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/715441" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cells, Cultured ; Oxidoreductases/metabolism ; Trypanosoma brucei brucei/cytology/enzymology/*growth & development ; Trypanosomiasis, African/*parasitology
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  • 10
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    Calcification of differentiating skeletal mesenchyme in vitro (1979)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1979-10-12
    Description: Embryonic limb-bud mesenchyme was induced to calcify in culture by the addition of 3 mM inorganic phosphate to the medium. Phosphate enhanced calcification of the matrix produced by mesenchymal or fibroblast-like cells, whereas no calcification was evident in areas where cartilage had developed. However, calcification was induced throughout the cell layer by altering the cartilage matrix properties with certain enzymes or by changing the phenotypic expression of the cells with vitamin A.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Binderman, I -- Greene, R M -- Pennypacker, J P -- New York, N.Y. -- Science. 1979 Oct 12;206(4415):222-5.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/482937" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Bone Development/drug effects ; Bromodeoxyuridine/pharmacology ; *Calcification, Physiologic/drug effects ; Cell Differentiation ; Cells, Cultured ; Chick Embryo ; Collagen/physiology ; Fibroblasts/cytology ; Hyaluronoglucosaminidase/metabolism ; Mesoderm/cytology ; Phosphates/metabolism ; Proteoglycans/physiology ; Vitamin A/pharmacology
    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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