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  • Male  (56)
  • Cells, Cultured  (28)
  • American Association for the Advancement of Science (AAAS)  (81)
  • American Association of Petroleum Geologists (AAPG)
  • 1985-1989  (81)
  • 1987  (81)
Sammlung
Verlag/Herausgeber
  • American Association for the Advancement of Science (AAAS)  (81)
  • American Association of Petroleum Geologists (AAPG)
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  • 1985-1989  (81)
Jahr
  • 1
    Publikationsdatum: 1987-11-13
    Beschreibung: The long-term effects of excitotoxic lesions in the nucleus basalis magnocellularis of the rat were found to mimic several neuropathological and chemical changes associated with Alzheimer's disease. Neuritic plaque-like structures, neurofibrillary changes, and neuronal atrophy or loss were observed in the frontoparietal cortex, hippocampus, amygdala, and entorhinal cortex 14 months after the lesions were made. Cholinergic markers in neocortex were reduced, while catecholamine and indoleamine metabolism was largely unaffected at this time. Bilateral lesions of the nucleus basalis magnocellularis increased somatostatin and neuropeptide Y in the cortex of the rat by at least 138 and 284 percent, respectively, suggesting a functional interaction between cholinergic and peptidergic neurons that may differ from that in Alzheimer's disease.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Arendash, G W -- Millard, W J -- Dunn, A J -- Meyer, E M -- HD 17933/HD/NICHD NIH HHS/ -- New York, N.Y. -- Science. 1987 Nov 13;238(4829):952-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biology, University of South Florida, Tampa 33620.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2890210" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Acetylcholinesterase/metabolism ; Animals ; Biogenic Amines/metabolism ; Brain/metabolism/*pathology ; Cerebral Cortex/metabolism/*pathology ; Choline/metabolism ; Choline O-Acetyltransferase/metabolism ; Male ; Neuropeptide Y/analysis ; Olivary Nucleus/*physiology ; Organ Specificity ; Rats ; Rats, Inbred Strains ; Somatostatin/analysis
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1987-07-24
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Booth, W -- New York, N.Y. -- Science. 1987 Jul 24;237(4813):355-6.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2885919" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Acquired Immunodeficiency Syndrome/*transmission ; Animals ; *Culicidae ; DNA Replication ; Female ; HIV/genetics ; Humans ; Insect Bites and Stings ; Insect Vectors ; Male ; Virus Replication
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1987-10-09
    Beschreibung: In sharp contrast with the experiences of all other industrialized nations, the size of the labor force of the United States is growing rapidly while, simultaneously, its age, gender, and ethnic composition are changing markedly. Consequently, human resource issues present an unprecedented challenge in the nation's quest to achieve a fully employed and equitable society. New public policies that focus on labor market adjustment policies will be required if these developments are to be a boon rather than a bane to the emerging postindustrial economy.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Briggs, V M Jr -- New York, N.Y. -- Science. 1987 Oct 9;238(4824):176-80.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉New York State School of Industrial and Labor Relations, Cornell University, Ithaca 14851.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3659908" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Adult ; Age Factors ; Australia ; Canada ; Emigration and Immigration ; *Employment ; Europe ; Female ; Humans ; Japan ; Male ; *Population ; Unemployment ; United States
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1987-07-10
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Barnes, D M -- New York, N.Y. -- Science. 1987 Jul 10;237(4811):128-30.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3037699" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Acquired Immunodeficiency Syndrome/*drug therapy ; Amino Acid Sequence ; Antigens, Differentiation, T-Lymphocyte ; Antigens, Surface/metabolism ; Antiviral Agents/pharmacology/*therapeutic use ; Brain/metabolism ; Depression, Chemical ; Drug Evaluation ; HIV/drug effects/physiology ; HIV Envelope Protein gp120 ; Humans ; Male ; Oligopeptides/pharmacology/*therapeutic use ; Peptide T ; Protein Binding/drug effects ; Receptors, Virus/drug effects ; Retroviridae Proteins/metabolism ; Virus Replication/drug effects
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
    Publikationsdatum: 1987-10-23
    Beschreibung: Intraperitoneal administration of human recombinant interleukin-1 (IL-1) to rats can increase blood levels of corticosterone and adrenocorticotropic hormone (ACTH). The route by which IL-1 affects pituitary-adrenal activity is unknown. That the IL-1-induced pituitary-adrenal activation involves an increased secretion of corticotropin-releasing factor (CRF) is indicated by three lines of evidence. First, immunoneutralization of CRF markedly attenuated the IL-1-induced increase of ACTH blood levels. Second, after blockade of fast axonal transport in hypothalamic neurons by colchicine, IL-1 administration decreased the CRF immunostaining in the median eminence, indicating an enhanced release of CRF in response to IL-1. Third, IL-1 did not stimulate ACTH release from primary cultures of anterior pituitary cells. These data further support the notion of the existence of an immunoregulatory feedback circuit between the immune system and the brain.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Berkenbosch, F -- van Oers, J -- del Rey, A -- Tilders, F -- Besedovsky, H -- New York, N.Y. -- Science. 1987 Oct 23;238(4826):524-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Pharmacology, Medical Faculty, Free University, Amsterdam, the Netherlands.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2443979" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Adrenal Glands/physiology ; Adrenocorticotropic Hormone/secretion ; Animals ; Axonal Transport/drug effects ; Colchicine/pharmacology ; Corticotropin-Releasing Hormone/immunology/*physiology ; Fluorescent Antibody Technique ; Hypothalamus/*metabolism ; Immune Sera/pharmacology ; Interleukin-1/*physiology ; Male ; Median Eminence/metabolism ; Neurons/*metabolism ; Pituitary Gland, Anterior/physiology ; Rats ; Rats, Inbred Strains
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
    Publikationsdatum: 1987-10-23
    Beschreibung: Exposure to bacterial endotoxins has long been known to stimulate the release of anterior pituitary hormones; administration of endotoxin was at one time a common clinical test of anterior pituitary function. Endotoxin is a potent stimulus for production of the endogenous pyrogenic protein, interleukin-1 (IL-1), by macrophages and monocytes. The possibility that IL-1 has a direct effect on the secretion of hormones by rat pituitary cells in a monolayer culture was investigated. Recombinant human IL-1 beta stimulated the secretion of adrenocorticotropic hormone, luteinizing hormone, growth hormone, and thyroid-stimulating hormone. Increased hormone secretion into culture supernatants was found with IL-1 concentrations ranging from 10(-9) M to 10(-12) M. Prolactin secretion by the monolayers was inhibited by similar doses. These concentrations of IL-1 are within the range reported for IL-1 in serum, suggesting that IL-1 generated peripherally by mononuclear immune cells may act directly on anterior pituitary cells to modulate hormone secretion in vivo. Incubation of IL-1 solutions with antibody to IL-1 neutralized these actions. These pituitary effects of IL-1 suggest that this monokine may be an important regulator of the metabolic adaptations to infectious stressors.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Bernton, E W -- Beach, J E -- Holaday, J W -- Smallridge, R C -- Fein, H G -- New York, N.Y. -- Science. 1987 Oct 23;238(4826):519-21.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Division of Neuropsychiatry, Walter Reed Army Institute of Research, Washington, D.C. 20307-5100.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2821620" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Adrenocorticotropic Hormone/secretion ; Animals ; Cells, Cultured ; Dinoprostone ; Female ; Growth Hormone/secretion ; Humans ; Infection/physiopathology ; Inflammation/physiopathology ; Interleukin-1/*physiology ; Luteinizing Hormone/secretion ; Pituitary Gland, Anterior/*secretion ; Pituitary Hormones, Anterior/*secretion ; Prolactin/secretion ; Prostaglandins E/secretion ; Rats ; Rats, Inbred Strains ; Recombinant Proteins/pharmacology ; Thyrotropin/secretion
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 7
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1987-11-06
    Beschreibung: The c-erbA gene belongs to a multigene family that encodes transcriptional regulatory proteins including the v-erbA oncogene product, steroid hormone receptors, and the vitamin D3 receptor. A v-erbA DNA probe encoding the DNA-binding region of the v-erbA protein was used to screen a human complementary DNA testis library. One of the clones isolated, erbA-T-1, was found to encode a 490-amino acid protein (erbA-T). The erbA-T polypeptide shows high homology with the proteins encoded by both the chicken c-erbA and the human c-erbA-beta genes but is most closely related to the chicken gene. The chicken c-erbA and the human c-erbA-beta genes encode high-affinity receptors for thyroid hormone, and here it is shown that the erbA-T protein binds specifically to 3,5,3'-triiodo-L-thyronine with a dissociation constant of 3.8 +/- 0.2 x 10(-10) M. These data imply that more than one thyroid hormone receptor exists in humans and that these receptors might have different tissue- and gene-activating specificities.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Benbrook, D -- Pfahl, M -- DK-35083/DK/NIDDK NIH HHS/ -- New York, N.Y. -- Science. 1987 Nov 6;238(4828):788-91.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Cancer Research Center, La Jolla Cancer Research Foundation, CA 92037.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3672126" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Amino Acid Sequence ; *Cloning, Molecular ; DNA/*metabolism ; *Genes ; Humans ; Kinetics ; Male ; Protein Biosynthesis ; *Proto-Oncogenes ; Receptors, Thyroid Hormone/*genetics/metabolism ; Testis/*metabolism ; Transcription, Genetic
    Print ISSN: 0036-8075
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 8
    Publikationsdatum: 1987-08-28
    Beschreibung: Li-Fraumeni syndrome is manifested in a variety of neoplasms that are transmitted in a dominantly inherited pattern. The noncancerous skin fibroblasts of family members exhibit a unique characteristic of being resistant to the killing effect of ionizing radiation. A three- to eightfold elevation in expression of c-myc and an apparent activation of c-raf-1 gene have been observed in these noncancerous skin fibroblasts. These results may provide insight into the heritable defect underlying the familial predisposition to a variety of cancers.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Chang, E H -- Pirollo, K F -- Zou, Z Q -- Cheung, H Y -- Lawler, E L -- Garner, R -- White, E -- Bernstein, W B -- Fraumeni, J W Jr -- Blattner, W A -- CA45158/CA/NCI NIH HHS/ -- CO7488/CO/NCI NIH HHS/ -- New York, N.Y. -- Science. 1987 Aug 28;237(4818):1036-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3616624" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Cell Transformation, Neoplastic/radiation effects ; Cells, Cultured ; Fibroblasts/*radiation effects ; Humans ; Mice ; Mice, Nude ; Neoplastic Syndromes, Hereditary/*genetics ; Oncogenes/*radiation effects ; Pedigree ; *Radiation Tolerance ; Skin/cytology/*radiation effects ; Syndrome
    Print ISSN: 0036-8075
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 9
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1987-12-04
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Dunn, A J -- Powell, M L -- Gaskin, J M -- MH25486/MH/NIMH NIH HHS/ -- New York, N.Y. -- Science. 1987 Dec 4;238(4832):1423-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Neuroscience, College of Medicine, University of Florida, Gainesville 32610.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3685987" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Corticosterone/*blood ; Female ; Hypophysectomy ; Lymphocytes/physiology ; Male ; Mice ; Mice, Inbred Strains ; Models, Biological ; Newcastle Disease/*blood ; Pituitary-Adrenal System/*physiopathology ; Postoperative Complications/blood ; Stress, Physiological/blood
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 10
    Publikationsdatum: 1987-10-09
    Beschreibung: Oncogenes encoding serine/threonine or tyrosine kinases were introduced into the established rodent fibroblast cell line NIH 3T3 and tested for tumorigenic and metastatic behavior in T cell-deficient nude mice. Transforming oncogenes of the ras family were capable of converting fibroblast cell lines to fully metastatic tumors. Cell lines transformed by the kinase oncogenes mos, raf, src, fes, and fms formed experimental metastases and (in some cases) these genes were more efficient at metastatic conversion than a mutant ras gene. In contrast, cells transformed by either of two nuclear oncogenes, myc or p53, were tumorigenic when injected subcutaneously but were virtually nonmetastatic after intravenous injection. These data demonstrate that, in addition to ras, a structurally divergent group of kinase oncogenes can induce the metastatic phenotype.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Egan, S E -- Wright, J A -- Jarolim, L -- Yanagihara, K -- Bassin, R H -- Greenberg, A H -- New York, N.Y. -- Science. 1987 Oct 9;238(4824):202-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Manitoba Institute of Cell Biology, University of Manitoba, Winnipeg, Canada.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3659911" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; *Cell Transformation, Neoplastic ; Cells, Cultured ; *Genes ; Mice ; *Neoplasm Metastasis ; *Oncogenes ; Phenotype ; Protein Kinases/*genetics
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 11
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1987-03-27
    Beschreibung: The earliest known response of eggs to sperm in many species is a change in egg membrane potential. However, for no species is it known what components of the sperm cause the opening of the egg plasma membrane channels. Protein isolated from sperm acrosomal granules of the marine worm Urechis caused electrical responses in oocytes with the same form, amplitude, and ion dependence as the fertilization potentials induced by living sperm. Sperm initiated fertilization potentials in oocytes when sperm-oocyte fusion, but not binding, was inhibited by clamping oocyte membrane potentials to positive values. Acrosomal protein also initiated electrical responses in clamped oocytes. These results support the hypothesis that it is the sperm acrosomal protein that opens ion channels in the oocyte membrane.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Gould, M -- Stephano, J L -- New York, N.Y. -- Science. 1987 Mar 27;235(4796):1654-6.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3823908" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Acrosome/*physiology ; Action Potentials ; Animals ; Annelida ; Calcium/metabolism ; Carrier Proteins/isolation & purification/*pharmacology ; Electric Stimulation ; Electrophysiology ; Female ; Fertilization ; Male ; Sodium/metabolism ; *Sperm-Ovum Interactions ; Spermatozoa/*physiology
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 12
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1987-10-09
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Holden, C -- New York, N.Y. -- Science. 1987 Oct 9;238(4824):158-60.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3659906" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Female ; Humans ; *Life Expectancy ; Male ; Sex Factors ; Sex Ratio
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
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  • 13
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1987-08-28
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hedrick, P W -- New York, N.Y. -- Science. 1987 Aug 28;237(4818):963.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3616627" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Acinonyx/*genetics ; Animals ; Carnivora/*genetics ; Genetic Variation ; *Genetics, Population ; Houseflies/*genetics ; Male ; Mice/genetics ; Reproduction
    Print ISSN: 0036-8075
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 14
    Publikationsdatum: 1987-05-15
    Beschreibung: A new human T-lymphotropic virus (HTLV-4) was recently described in healthy people from Senegal. This virus has many properties in common with members of the human T-lymphotropic viruses, particularly the human immunodeficiency virus or HIV, the etiologic agent of acquired immune deficiency syndrome (AIDS), but does not appear to be associated with immunodeficiency-related disorders. In the present study, serum samples were obtained from 4248 individuals from six West African countries, including Senegal, Guinea, Guinea Bissau, Mauritania, Burkina Faso, and Ivory Coast. These samples, collected during 1985-1987, were from people categorized as healthy control, sexually active risk, and disease populations. All samples were analyzed for reactivity to HTLV-4 and HIV by radioimmunoprecipitation-sodium dodecyl sulfate-polyacrylamide gel electrophoresis and immunoblotting. Evidence for HTLV-4 infection was found in five of the six countries. The seroprevalence varied markedly from country to country. Healthy sexually active individuals in the risk category had the highest levels of HTLV-4 infection compared to individuals in the healthy control category and the disease category, the latter including AIDS patients. The seroprevalence of HIV infection in most of these countries was quite low, although tightly associated with the rare cases of AIDS. The biology of HTLV-4 infection thus differs from that of HIV in Central Africa or the United States and Europe. The presence of these viruses and their different pathogenicities in several countries of West Africa indicate the necessity for serologic assays that will distinguish between them. Further studies of their origin and distribution as well as of their biology will be important in advancing our understanding of AIDS.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kanki, P J -- M'Boup, S -- Ricard, D -- Barin, F -- Denis, F -- Boye, C -- Sangare, L -- Travers, K -- Albaum, M -- Marlink, R -- CA 18216/CA/NCI NIH HHS/ -- CA 37466/CA/NCI NIH HHS/ -- FOD 630/OD/NIH HHS/ -- New York, N.Y. -- Science. 1987 May 15;236(4803):827-31.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3033826" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Acquired Immunodeficiency Syndrome/epidemiology ; Adult ; Africa, Western ; Deltaretrovirus/*isolation & purification ; Demography ; Female ; HIV/*isolation & purification ; Humans ; Inpatients ; Male ; Pregnancy ; Prisoners ; Prostitution ; Reference Values ; Risk
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
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  • 15
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1987-10-16
    Beschreibung: A portion of the Duchenne muscular dystrophy (DMD) gene transcript from human fetal skeletal muscle and mouse adult heart was sequenced, representing approximately 25 percent of the total, 14-kb DMD transcript. The nucleic acid and predicted amino acid sequences from the two species are nearly 90 percent homologous. The amino acid sequence that is predicted from this portion of the DMD gene indicates that the protein product might serve a structural role in muscle, but the abundance and tissue distribution of the messenger RNA suggests that the DMD protein is not nebulin.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hoffman, E P -- Monaco, A P -- Feener, C C -- Kunkel, L M -- 2T 32 GM07753-07/GM/NIGMS NIH HHS/ -- HD18658/HD/NICHD NIH HHS/ -- R01 NS23740/NS/NINDS NIH HHS/ -- T32 GM007753/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1987 Oct 16;238(4825):347-50.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Division of Genetics, Children's Hospital, Boston, MA 02115.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3659917" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Amino Acid Sequence ; Animals ; Base Sequence ; DNA/*genetics ; DNA, Recombinant ; Exons ; Humans ; Male ; Mice ; Molecular Sequence Data ; Muscle Proteins/genetics ; Muscles/analysis/embryology ; Muscular Dystrophies/*genetics ; Muscular Dystrophy, Animal/*genetics ; Myocardium/analysis ; Nucleic Acid Hybridization ; RNA, Messenger/genetics ; X Chromosome
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
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  • 16
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1987-06-26
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kolata, G -- New York, N.Y. -- Science. 1987 Jun 26;236(4809):1626-7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3603001" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Humans ; Male ; National Institutes of Health (U.S.) ; Prostatic Neoplasms/*therapy ; United States
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    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 17
    Publikationsdatum: 1987-08-21
    Beschreibung: The molecular basis for the marked difference between primate and rodent cells in sensitivity to the cardiac glycoside ouabain has been established by genetic techniques. A complementary DNA encoding the entire alpha 1 subunit of the mouse Na+- and K+-dependent adenosine triphosphatase (ATPase) was inserted into the expression vector pSV2. This engineered DNA molecule confers resistance against 10(-4) M ouabain to monkey CV-1 cells. Deletion of sequences encoding the carboxyl terminus of the alpha 1 subunit abolish the activity of the complementary DNA. The ability to assay the biological activity of this ATPase in a transfection protocol permits the application of molecular genetic techniques to the analysis of structure-function relationships for the enzyme that establishes the internal Na+/K+ environment of most animal cells. The full-length alpha 1 subunit complementary DNA will also be useful as a dominant selectable marker for somatic cell genetic studies utilizing ouabain-sensitive cells.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kent, R B -- Emanuel, J R -- Ben Neriah, Y -- Levenson, R -- Housman, D E -- CA-07919/CA/NCI NIH HHS/ -- CA-26712/CA/NCI NIH HHS/ -- CA-38992/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1987 Aug 21;237(4817):901-3.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3039660" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Cells, Cultured ; Cercopithecus aethiops ; DNA/genetics ; Drug Resistance ; Gene Expression Regulation ; Macromolecular Substances ; Mice ; Ouabain/*pharmacology ; Sodium-Potassium-Exchanging ATPase/antagonists & inhibitors/*genetics ; Species Specificity ; Structure-Activity Relationship ; Transfection
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 18
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    Unbekannt
    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1987-05-15
    Beschreibung: Neoplasms produce substances that induce blood vessel formation (angiogenesis). Fractions from ethanol extracts of the Walker 256 carcinoma were isolated by silica column chromatography and C18 reversed-phase high-performance liquid chromatography. Two of the isolated fractions induced neovascularization when tested in the rabbit corneal micropocket assay. One of the fractions was identified as nicotinamide by desorption-electron impact mass spectrometry, nuclear magnetic resonance spectroscopy, and gas chromatography-mass spectrometry. The second active fraction contained nicotinamide as part of a more complex, as yet unidentified, molecular arrangement. Microgram quantities of commercial nicotinamide induced neovascularization in the corneal micropocket assay and in the chick chorioallantoic membrane assay.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kull, F C Jr -- Brent, D A -- Parikh, I -- Cuatrecasas, P -- New York, N.Y. -- Science. 1987 May 15;236(4803):843-5.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2437656" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Angiogenesis Inducing Agents/*isolation & purification/pharmacology ; Animals ; Carcinoma 256, Walker/*physiopathology ; Cells, Cultured ; Chick Embryo ; Cornea/blood supply ; Endothelium/cytology/drug effects ; Gas Chromatography-Mass Spectrometry ; Growth Substances/*isolation & purification ; Magnetic Resonance Spectroscopy ; Mass Spectrometry ; Mice ; Neovascularization, Pathologic ; Niacinamide/isolation & purification/pharmacology
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 19
    Publikationsdatum: 1987-12-04
    Beschreibung: The inherited genetic defect in adenomatous polyposis has been localized to a small region on the long arm of chromosome 5. Sixteen DNA marker loci were used to construct a linkage map of the chromosome. When five kindreds segregating a gene for adenomatous polyposis coli were characterized with a number of the markers, significant linkage was found between one marker and the disease gene. Linkage analysis determined the location of the defective gene within a primary genetic map of chromosome 5.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Leppert, M -- Dobbs, M -- Scambler, P -- O'Connell, P -- Nakamura, Y -- Stauffer, D -- Woodward, S -- Burt, R -- Hughes, J -- Gardner, E -- CA40641/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1987 Dec 4;238(4832):1411-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute, Department of Human Genetics, University of Utah Medical Center, Salt Lake City 84132.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3479843" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Chromosome Mapping ; *Chromosomes, Human, Pair 5 ; Colonic Polyps/*genetics ; Female ; Gardner Syndrome/genetics ; *Genes ; Genetic Markers ; Humans ; Lod Score ; Male ; Neoplasms, Multiple Primary/*genetics
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 20
    Publikationsdatum: 1987-08-14
    Beschreibung: Foreign DNA was successfully introduced into the germline of the African mosquito vector of malaria Anopheles gambiae. Stable integration of genes into the germlines of insects had been achieved previously only in Drosophila melanogaster and related species and required the use of the P element transposon. In these experiments with Anopheles gambiae, the plasmid pUChsneo was used, which contains the selectable marker neo gene flanked by P element inverted repeats. Mosquitoes injected with this plasmid were screened for resistance to the neomycin analog G-418. A single event of plasmid insertion was recovered. Integration appears to be stable and, thus far, resistance to G-418 has been expressed for eight generations. The transformation event appears to be independent of P.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Miller, L H -- Sakai, R K -- Romans, P -- Gwadz, R W -- Kantoff, P -- Coon, H G -- New York, N.Y. -- Science. 1987 Aug 14;237(4816):779-81.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3039658" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Anopheles/embryology/*genetics ; DNA Transposable Elements ; DNA, Bacterial/genetics ; Drosophila melanogaster/genetics ; Drug Resistance/genetics ; Female ; *Genes, Bacterial ; Gentamicins/pharmacology ; Male ; Microinjections ; Plasmids ; *Transformation, Genetic
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 21
    Publikationsdatum: 1987-12-11
    Beschreibung: A new human retrovirus was isolated from a continuous cell line derived from a patient with CD4+ Tac- cutaneous T cell lymphoma/leukemia. This virus is related to but distinct from human T cell leukemia/lymphoma virus types I and II (HTLV-I and HTLV-II) and human immunodeficiency virus (HIV-1). With the use of a fragment of provirus cloned from one patient with T cell leukemia, closely related sequences were found in DNA of the cell line and of tumor cells from seven other patients with the same disease; these sequences were only distantly related to HTLV-I. The phenotype of the cells and the clinical course of the disease were clearly distinguishable from leukemia associated with HTLV-I. All patients and the wife of one patient showed a weak serological cross-reactivity with both HTLV-I and HIV-1 antigens. None of the patients proved to be at any apparent risk for HIV-1 infection. The name proposed for this virus is HTLV-V, and the date indicate that it may be a primary etiological factor in the major group of cutaneous T cell lymphomas/leukemias, including the sporadic lymphomas known as mycoses fungoides.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Manzari, V -- Gismondi, A -- Barillari, G -- Morrone, S -- Modesti, A -- Albonici, L -- De Marchis, L -- Fazio, V -- Gradilone, A -- Zani, M -- New York, N.Y. -- Science. 1987 Dec 11;238(4833):1581-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Dipartimento di Medicina Sperimentale e Scienze Biochimiche II, Universita di Roma, Tor Vergata, Italy.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2825353" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Antigens, Viral/analysis ; Deltaretrovirus/classification/*isolation & purification/ultrastructure ; Female ; Humans ; Leukemia/*microbiology ; Lymphoma/*microbiology ; Male ; Microscopy, Electron ; T-Lymphocytes/cytology
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 22
    Publikationsdatum: 1987-10-02
    Beschreibung: Epidermal growth factor (EGF) is a potent polypeptide mitogen originally isolated from the adult male mouse submaxillary gland. It also acts as a gastrointestinal hormone. EGF-immunoreactive material has recently been identified within neuronal fibers and terminals in rodent brain. In the present study, EGF was found to enhance survival and process outgrowth of primary cultures of subneocortical telencephalic neurons of neonatal rat brain in a dose-dependent manner. This effect was observed with EGF concentrations as low as 100 picograms per milliliter (0.016 nanomolar) and was dependent on the continuous presence of EGF in the medium. Similar effects were observed with basic fibroblast growth factor, but several other growth-promoting substances, including other mitogens for glial elements, were without effect. Thus EGF, in addition to its mitogenic and hormonal activities, may act as a neurite elongation and maintenance factor for select neurons of the rodent central nervous system.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Morrison, R S -- Kornblum, H I -- Leslie, F M -- Bradshaw, R A -- NS19319/NS/NINDS NIH HHS/ -- NS19964/NS/NINDS NIH HHS/ -- T32-CA0905A/CA/NCI NIH HHS/ -- etc. -- New York, N.Y. -- Science. 1987 Oct 2;238(4823):72-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biological Chemistry, College of Medicine, University of California, Irvine 92717.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3498986" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Animals, Newborn ; Brain/*cytology ; Cell Survival/drug effects ; Cells, Cultured ; Epidermal Growth Factor/*physiology ; Growth Substances/pharmacology ; Rats
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 23
    Publikationsdatum: 1987-09-11
    Beschreibung: The role of polypeptide growth factors in the processes of inflammation and repair was investigated by analyzing the influence of transforming growth factor-beta (TGF-beta), applied directly to linear incisions made through rat dorsal skin. A dose-dependent, direct stimulatory effect of a single application of TGF-beta on the breaking strength of healing incisional wounds was demonstrated. An increase in maximum wound strength of 220 percent of control was observed at 5 days; the healing rate was accelerated by approximately 3 days for at least 14 days after production of the wound and application of TGF-beta. These increases in wound strength were accompanied by an increased influx of mononuclear cells and fibroblasts and by marked increases in collagen deposition at the site of application of TGF-beta. TGF-beta is thus a potent pharmacologic agent that can accelerate wound healing in rats.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Mustoe, T A -- Pierce, G F -- Thomason, A -- Gramates, P -- Sporn, M B -- Deuel, T F -- New York, N.Y. -- Science. 1987 Sep 11;237(4820):1333-6.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2442813" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Growth Substances/*pharmacology ; Male ; Peptides/*pharmacology ; Rats ; Rats, Inbred Strains ; Staining and Labeling ; Transforming Growth Factors ; Wound Healing/*drug effects ; Wounds, Penetrating/*pathology
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 24
    Publikationsdatum: 1987-01-09
    Beschreibung: In Xuan Wei County, Yunnan Province, lung cancer mortality is among China's highest and, especially in females, is more closely associated with indoor burning of "smoky" coal, as opposed to wood or "smokeless" coal, than with tobacco smoking. Indoor air samples were collected during the burning of all three fuels. In contrast to wood and smokeless coal emissions, smoky coal emission has high concentrations of submicron particles containing mutagenic organics, especially in aromatic and polar fractions. These studies suggested an etiologic link between domestic smoky coal burning and lung cancer in Xuan Wei.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Mumford, J L -- He, X Z -- Chapman, R S -- Cao, S R -- Harris, D B -- Li, X M -- Xian, Y L -- Jiang, W Z -- Xu, C W -- Chuang, J C -- New York, N.Y. -- Science. 1987 Jan 9;235(4785):217-20.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3798109" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): China ; *Coal ; Female ; Humans ; Male ; Neoplasms/etiology/*mortality ; Polycyclic Compounds/analysis ; Smoke/*adverse effects/analysis ; Wood
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 25
    facet.materialart.
    Unbekannt
    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1987-11-27
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Palmer, A R -- New York, N.Y. -- Science. 1987 Nov 27;238(4831):1217.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3685970" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; DNA, Mitochondrial/*genetics ; Female ; Fertilization ; Male ; Spermatozoa/*physiology ; Zygote/physiology
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 26
    Publikationsdatum: 1987-02-13
    Beschreibung: A highly T-lymphotropic virus was isolated from cats in a cattery in which all the animals were seronegative for feline leukemia virus. A number of cats in one pen had died and several had an immunodeficiency-like syndrome. Only 1 of 18 normal cats in the cattery showed serologic evidence of infection with this new virus, whereas 10 of 25 cats with signs of ill health were seropositive for the virus. Tentatively designated feline T-lymphotropic lentivirus, this new feline retrovirus appears to be antigenically distinct from human immunodeficiency virus. There is no evidence for cat-to-human transmission of the agent. Kittens experimentally infected by way of blood or plasma from naturally infected animals developed generalized lymphadenopathy several weeks later, became transiently febrile and leukopenic, and continued to show a generalized lymphadenopathy 5 months after infection.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Pedersen, N C -- Ho, E W -- Brown, M L -- Yamamoto, J K -- CA-39016-02/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1987 Feb 13;235(4790):790-3.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3643650" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Antigens, Viral/analysis ; Cat Diseases/*microbiology ; Cats/*microbiology ; Female ; HIV/immunology ; Immunologic Deficiency Syndromes/microbiology/*veterinary ; Lymphocytes/ultrastructure ; Male ; Microscopy, Electron ; Retroviridae/immunology/*isolation & purification/ultrastructure ; Species Specificity
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 27
    facet.materialart.
    Unbekannt
    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1987-04-10
    Beschreibung: A cycloheximide-sensitive protein responsive to adenosine 3',5'-monophosphate has been postulated to participate in the regulation of cholesterol side-chain cleavage activity in steroidogenic tissues. Such a steroidogenesis activator polypeptide (SAP) had been isolated from rat adrenocortical tissue and partially characterized. Now a polypeptide with comparable chromatographic behavior and biological activity has been purified from the rat H-540 Leydig cell tumor in quantities sufficient for amino acid sequencing. The activator contains 30 amino acid residues and has a molecular weight of 3215. The synthetic construct based on this sequence is virtually equipotent with native H-540 tumor SAP in an adrenal mitochondrial cholesterol side-chain cleavage assay. Hormonal regulation of the intracellular concentration of this activator may control the rate of cholesterol metabolism in steroidogenic organs.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Pedersen, R C -- Brownie, A C -- AM18141/AM/NIADDK NIH HHS/ -- HD00613/HD/NICHD NIH HHS/ -- HD19309/HD/NICHD NIH HHS/ -- New York, N.Y. -- Science. 1987 Apr 10;236(4798):188-90.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3563495" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Adrenal Cortex/analysis ; Amino Acid Sequence ; Animals ; Cholesterol/metabolism ; Cholesterol Side-Chain Cleavage Enzyme/*metabolism ; Chromatography, High Pressure Liquid ; *Heat-Shock Proteins ; Leydig Cell Tumor/*analysis ; Male ; Mitochondria/enzymology ; *Molecular Chaperones ; Oxidoreductases/*metabolism ; Peptide Fragments/analysis ; Proteins/*analysis ; Rats ; Steroids/*biosynthesis
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 28
    facet.materialart.
    Unbekannt
    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1987-07-10
    Beschreibung: Inhibin is a gonadal glycoprotein hormone that regulates the production of follicle-stimulating hormone (FSH) by the anterior pituitary gland and exhibits intragonadal actions as well. The present study shows that inhibin-like immunoreactivity (inhibin-LI) is present in cells of the cytotrophoblast layer of human placenta at term and in primary cultures of human trophoblasts. Human chorionic gonadotropin (hCG) stimulated secretion of inhibin-LI from these cultured placental cells. This effect was mimicked by 8-bromo-cyclic adenosine monophosphate (8-bromo-cAMP), forskolin, and cholera toxin, suggesting that the mechanism of hCG induction of placental inhibin-LI secretion is cAMP-dependent. Incubation with an antiserum that binds the alpha-subunit of human inhibin increased the secretion of hCG and gonadotropin-releasing hormone-like immunoreactivity (GnRH-LI) from trophoblast cells in culture, suggesting a local tonic inhibitory action of endogenous inhibin on hCG and GnRH-LI release. The action of inhibin on hCG secretion may partially require the presence of placental GnRH, as suggested by evidence that a synthetic GnRH antagonist partially reverses the hCG increase induced by inhibin immunoneutralization. Results suggest paracrine roles for both inhibin and GnRH in the regulation of placental hCG production.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Petraglia, F -- Sawchenko, P -- Lim, A T -- Rivier, J -- Vale, W -- AM26741/AM/NIADDK NIH HHS/ -- HD13527/HD/NICHD NIH HHS/ -- NS21182/NS/NINDS NIH HHS/ -- New York, N.Y. -- Science. 1987 Jul 10;237(4811):187-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3299703" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): 8-Bromo Cyclic Adenosine Monophosphate/pharmacology ; Cells, Cultured ; Cholera Toxin/pharmacology ; Chorionic Gonadotropin/pharmacology/*secretion ; Chorionic Villi/analysis ; Colforsin/pharmacology ; Feedback ; Female ; Gonadotropin-Releasing Hormone/antagonists & inhibitors/pharmacology/secretion ; Humans ; Infant, Newborn ; Inhibins/analysis/*physiology ; Male ; Pregnancy ; Secretory Rate/drug effects ; Trophoblasts/analysis/drug effects/*secretion
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 29
    facet.materialart.
    Unbekannt
    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1987-08-28
    Beschreibung: Chemical evidence is needed in both insect endocrinology and sensory physiology to understand hormone and pheromone action at the molecular level. Radiolabeled pheromones and hormones have been synthesized and used to identify binding and catabolic proteins from insect tissues. Chemically modified analogs, including photoaffinity labels and enzyme inhibitors, are among the tools used to covalently modify the specific acceptor or catalytic sites. Such targeted agents can also provide leads for the design of growth and mating disruptants by allowing manipulation of the physiologically important interactions of the chemical signals with macromolecules.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Prestwich, G D -- GM-30899/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1987 Aug 28;237(4818):999-1006.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3616631" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Bees/metabolism ; Chemical Phenomena ; Chemistry ; Cockroaches/metabolism ; Female ; Insect Hormones/*metabolism ; Insects/metabolism ; Juvenile Hormones/metabolism ; Male ; Methoprene/metabolism ; Moths/metabolism ; Pheromones/*metabolism
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 30
    Publikationsdatum: 1987-09-11
    Beschreibung: The validity of mouse liver tumor end points in assessing the potential hazards of chemical exposure to humans is a controversial but important issue, since liver neoplasia in mice is the most frequent tumor target tissue end point in 2-year carcinogenicity studies. The ability to distinguish between promotion of background tumors versus a genotoxic mechanism of tumor initiation by chemical treatment would aid in the interpretation of rodent carcinogenesis data. Activated oncogenes in chemically induced and spontaneously occurring mouse liver tumors were examined and compared as one approach to determine the mechanism by which chemical treatment caused an increased incidence of mouse liver tumors. Data suggest that furan and furfural caused an increased incidence in mouse liver tumors at least in part by induction of novel weakly activating point mutations in ras genes even though both chemicals did not induce mutations in Salmonella assays. In addition to ras oncogenes, two activated raf genes and four non-ras transforming genes were detected. The B6C3F1 mouse liver may thus provide a sensitive assay system to detect various classes of proto-oncogenes that are susceptible to activation by carcinogenic insult. As illustrated with mouse liver tumors, analysis of activated oncogenes in spontaneously occurring and chemically induced rodent tumors will provide information at a molecular level to aid in the use of rodent carcinogenesis data for risk assessment.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Reynolds, S H -- Stowers, S J -- Patterson, R M -- Maronpot, R R -- Aaronson, S A -- Anderson, M W -- New York, N.Y. -- Science. 1987 Sep 11;237(4820):1309-16.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3629242" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Cell Line ; *Cell Transformation, Neoplastic ; Cells, Cultured ; Liver Neoplasms/*genetics ; Mice ; Mutation ; Nucleic Acid Hybridization ; *Oncogenes ; *Proto-Oncogenes ; Risk
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 31
    Publikationsdatum: 1987-09-04
    Beschreibung: Although cocaine binds to several sites in the brain, the biochemical receptor mechanism or mechanisms associated with its dependence producing properties are unknown. It is shown here that the potencies of cocaine-like drugs in self-administration studies correlate with their potencies in inhibiting [3H]mazindol binding to the dopamine transporters in the rat striatum, but not with their potencies in binding to a large number of other presynaptic and postsynaptic binding sites. Thus, the cocaine receptor related to substance abuse is proposed to be the one associated with dopamine uptake inhibition.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ritz, M C -- Lamb, R J -- Goldberg, S R -- Kuhar, M J -- New York, N.Y. -- Science. 1987 Sep 4;237(4819):1219-23.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2820058" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Brain/drug effects/*metabolism ; Cattle ; Cocaine/administration & dosage/*pharmacology ; Corpus Striatum/metabolism ; Dopamine/metabolism ; Haplorhini ; Male ; Mazindol/metabolism ; Norepinephrine/metabolism ; Rats ; Rats, Inbred Strains ; Receptors, Adrenergic/drug effects/metabolism ; Receptors, Dopamine/drug effects/*metabolism ; Receptors, Serotonin/drug effects/metabolism ; Self Administration ; Serotonin/metabolism
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 32
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1987-07-03
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Roberts, L -- New York, N.Y. -- Science. 1987 Jul 3;237(4810):28-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3603009" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Adult ; Arteriosclerosis/*therapy ; Cholesterol/*adverse effects ; Colestipol/therapeutic use ; Dietary Fats/adverse effects ; Humans ; Male ; Middle Aged ; Niacin/therapeutic use
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 33
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    Unbekannt
    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1987-11-27
    Beschreibung: In density-arrested monolayer cultures of Balb/c 3T3 cells, platelet-derived growth factor (PDGF) stimulates expression of the c-myc and c-fos proto-oncogenes, as well as the functionally uncharacterized genes, JE, KC, and JB. These genes are not coordinately regulated. Under ordinary conditions, c-fos, JE, KC, and JB respond to PDGF only when the cells are in a state of G0 growth arrest at the time of PDGF addition. The c-myc gene is regulated in opposition to the other genes, responding best to PDGF in cycling cultures.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Rollins, B J -- Morrison, E D -- Stiles, C D -- CA 20042-09/CA/NCI NIH HHS/ -- GM 31489-04/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1987 Nov 27;238(4831):1269-71.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Division of Medicine, Dana-Farber Cancer Institute, Boston, MA 02115.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3685976" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Cell Cycle/drug effects ; Cell Division/drug effects ; Cells, Cultured ; Gene Expression Regulation/*drug effects ; Interphase ; Mice ; Mice, Inbred BALB C ; Platelet-Derived Growth Factor/*pharmacology ; Proto-Oncogenes/*drug effects ; Transcription, Genetic/*drug effects
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 34
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    Unbekannt
    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1987-03-13
    Beschreibung: Although homelessness has been recognized as a serious and growing urban social problem, scientifically acceptable methods for estimating the composition and size of the homeless population have been lacking. A new research approach to estimating the size and composition of undomiciled urban populations is presented, and its utility is illustrated through a description of the literal homeless of Chicago. The homeless in the Chicago sample are unaffiliated persons living in extreme poverty, with high levels of physical and mental disability. Homelessness is interpreted as a manifestation of extreme poverty among persons without families in housing markets with declining stocks of inexpensive dwelling units suitable for single persons.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Rossi, P H -- Wright, J D -- Fisher, G A -- Willis, G -- New York, N.Y. -- Science. 1987 Mar 13;235(4794):1336-41.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2950592" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Chicago ; Demography ; Disabled Persons ; Employment ; Female ; *Homeless Persons ; Humans ; Income ; Interviews as Topic ; Male ; Poverty ; Research Design ; Sampling Studies ; Social Isolation ; *Urban Population
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 35
    Publikationsdatum: 1987-07-24
    Beschreibung: Fragile X syndrome is a common form of mental retardation associated with a fragile site on the human X chromosome. Although fragility at this site is usually evident as a nonstaining chromatid gap, it remains unclear whether or not actual chromosomal breakage occurs. By means of somatic cell hybrids containing either a normal human X or a fragile X chromosome and utilizing two genes that flank the fragile site as markers of chromosome integrity, segregation of these markers was shown to be more frequent if they encompass the fragile site under appropriate culture conditions. Hybrid cells that reveal marker segregation were found to contain rearranged X chromosomes involving the region at or near the fragile site, thus demonstrating true chromosomal breakage within this area. Two independent translocation chromosomes were identified involving a rodent chromosome joined to the human X at the location of the fragile site. DNA analysis of closely linked, flanking loci was consistent with the position of the breakpoint being at or very near the fragile X site. Fragility at the translocation junctions was observed in both hybrids, but at significantly lower frequencies than that seen in the intact X of the parental hybrid. This observation suggests that the human portion of the junctional DNA may contain part of a repeated fragility sequence. Since the translocation junctions join heterologous DNA, the molecular cloning of the fragile X sequence should now be possible.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Warren, S T -- Zhang, F -- Licameli, G R -- Peters, J F -- CA31777/CA/NCI NIH HHS/ -- HD20521/HD/NICHD NIH HHS/ -- New York, N.Y. -- Science. 1987 Jul 24;237(4813):420-3.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3603029" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Cell Line ; Chromosome Banding ; *Cloning, Molecular ; Female ; Fragile X Syndrome/*genetics ; Glucosephosphate Dehydrogenase/genetics ; Humans ; Hybrid Cells/cytology ; Hypoxanthine Phosphoribosyltransferase/genetics ; Male ; Sex Chromosome Aberrations/*genetics ; Translocation, Genetic
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 36
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1987-12-18
    Beschreibung: The traditional view that quantal release of neurotransmitter results from the fusion of transmitter-containing vesicles with the neuronal membrane has been recently challenged. Although various alternative mechanisms have been proposed, a common element among them is the release of cytoplasmic transmitter, which, in one view, could occur through large conductance channels on the presynaptic membrane. Six nerve-muscle cell pairs were examined with a whole-cell patch clamp for the presence of such channels that are associated with the production of miniature end-plate potentials. Examination of the neuronal membrane current during the occurrence of 822 miniature end-plate potentials produced no evidence of large channels. Thus it is unlikely that quantal release is mediated by such channels in the neuromuscular junction.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Young, S H -- Chow, I -- New York, N.Y. -- Science. 1987 Dec 18;238(4834):1712-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physiology, UCLA School of Medicine 90024.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2891190" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Cell Membrane/*physiology ; Cells, Cultured ; Membrane Potentials ; Motor Endplate/cytology/*physiology ; Neuromuscular Junction/*physiology ; Neurons/cytology/*physiology ; Neurotransmitter Agents/*secretion ; Xenopus
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 37
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1987-10-23
    Beschreibung: The fluorescence anisotropy of 1,6-diphenyl-1,3,5-hexatriene in labeled platelet membranes, an index of membrane fluidity, identifies a prominent subgroup of patients with Alzheimer's disease who manifest distinct clinical features. In a family study, the prevalence of this platelet membrane abnormality was 3.2 to 11.5 times higher in asymptomatic, first-degree relatives of probands with Alzheimer's disease than in neurologically healthy control subjects chosen without regard to family history of dementia. The pattern of the platelet membrane abnormality within families was consistent with that of a fully penetrant autosomal dominant trait. Thus, this abnormality of platelet membranes may be an inherited factor that is related to the development of Alzheimer's disease.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Zubenko, G S -- Wusylko, M -- Cohen, B M -- Boller, F -- Teply, I -- AG03705/AG/NIA NIH HHS/ -- AG05133/AG/NIA NIH HHS/ -- MH30915/MH/NIMH NIH HHS/ -- etc. -- New York, N.Y. -- Science. 1987 Oct 23;238(4826):539-42.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Psychiatry, University of Pittsburgh, Western Psychiatric Institute and Clinic, PA 15213.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3659926" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Aged ; Alzheimer Disease/blood/*genetics ; Blood Platelets/*ultrastructure ; Cell Membrane/physiology ; Diphenylhexatriene ; Female ; Fluorescence Polarization ; Humans ; Male ; *Membrane Fluidity ; Middle Aged ; Risk Factors
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 38
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    Unbekannt
    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1987-01-02
    Beschreibung: The occurrence of seizure activity in human temporal lobe epilepsy or status epilepticus is often associated with a characteristic pattern of cell loss in the hippocampus. An experimental model that replicates this pattern of damage in normal animals by electrical stimulation of the afferent pathway to the hippocampus was developed to study changes in structure and function that occur as a result of repetitive seizures. Hippocampal granule cell seizure activity caused a persistent loss of recurrent inhibition and irreversibly damaged adjacent interneurons. Immunocytochemical staining revealed unexpectedly that gamma-aminobutyric acid (GABA)-containing neurons, thought to mediate inhibition in this region and predicted to be damaged by seizures, had survived. In contrast, there was a nearly complete loss of adjacent somatostatin-containing interneurons and mossy cells that may normally activate inhibitory neurons. These results suggest that the seizure-induced loss of a basket cell-activating system, rather than a loss of inhibitory basket cells themselves, may cause disinhibition and thereby play a role in the pathophysiology and pathology of the epileptic state.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sloviter, R S -- NS 18201/NS/NINDS NIH HHS/ -- New York, N.Y. -- Science. 1987 Jan 2;235(4784):73-6.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2879352" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Cholecystokinin/physiology ; Disease Models, Animal ; Electric Stimulation ; Epilepsy/pathology/*physiopathology ; Hippocampus/*physiopathology ; Immunologic Techniques ; Interneurons/*pathology/physiopathology ; Male ; Neural Inhibition ; Rats ; Somatostatin/*physiology ; Time Factors ; Vasoactive Intestinal Peptide/metabolism ; gamma-Aminobutyric Acid/*physiology
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 39
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    Unbekannt
    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1987-09-04
    Beschreibung: In John Walsh's article "Some refuseniks see no glasnost" (News & Comment, 24 July, p. 356), the Committee for Concerned Scientists was incorrecty identified as the "Union" of Concerned Scientists.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 1987 Sep 4;237(4819):1094.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3629229" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Alcoholism/*rehabilitation ; Follow-Up Studies ; Humans ; Male
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 40
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1987-01-30
    Beschreibung: The messenger RNA (mRNA) that encodes alpha subunit of the guanosine triphosphate-binding protein transducin (T alpha) and T alpha immunoreactivity were localized and measured in the rat retina during the light-dark cycle with in situ hybridization and immunohistochemistry. Both T alpha mRNA and T alpha immunoreactivity were observed only in photoreceptors. Within the photoreceptor T alpha mRNA was present primarily in the inner segments and to a lesser extent in the outer nuclear layer at all times during the day and night. However, the distribution of T alpha immunoreactivity varied profoundly with the light-dark cycle; during the day, T alpha immunoreactivity was highest in the inner segments, and at night the outer segments were more immunoreactive. The amounts of T alpha mRNA and T alpha immunoreactivity also depended on the light-dark cycle. Levels of T alpha mRNA were high immediately before and after lights on; levels were low for the rest of the light-dark cycle. During the day, T alpha immunoreactivity increased in the inner segments following the increase in T alpha mRNA. After the lights were turned off, T alpha immunoreactivity decreased in the inner segments and increased in the outer segments. Thus, it appears that T alpha is synthesized in the inner segments after a morning increase in T alpha mRNA. Newly synthesized T alpha remains in the inner segments until it is transported to the outer segments at night, where it may be involved in the increase in the sensitivity of photoreceptor rods at night.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Brann, M R -- Cohen, L V -- New York, N.Y. -- Science. 1987 Jan 30;235(4788):585-7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3101175" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Biological Transport ; Circadian Rhythm ; GTP-Binding Proteins/*genetics/immunology/metabolism ; Gene Expression Regulation ; Immunoenzyme Techniques ; Male ; Membrane Proteins/*genetics/immunology/metabolism ; Photoreceptor Cells/*physiology/ultrastructure ; RNA, Messenger/genetics ; Rats ; Transducin
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 41
    facet.materialart.
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1987-05-22
    Beschreibung: The DNA in human sperm chromatin is packaged into nucleoprotamine (approximately 85%) and nucleohistone (approximately 15%). Whether these two chromatin fractions are sequence-specific subsets of the spermatozoon genome is the question addressed in this report. Sequence-specific packaging would suggest distinct structural and functional roles for the nucleohistone and nucleoprotamine in late spermatogenesis or early development or both. After removal of histones with 0.65M NaCl, exposed DNA was cleaved with Bam HI restriction endonuclease and separated by centrifugation from insoluble nucleoprotamine. The DNA sequence distribution of nucleohistone DNA in the supernatant and nucleoprotamine DNA in the pellet was compared by cloning size-selected single-copy sequences and by using the derived clones as probes of nucleohistone DNA and nucleoprotamine DNA. Two clones derived from nucleohistone DNA preferentially hybridized to nucleohistone DNA, and two clones derived from nucleoprotamine DNA preferentially hybridized to nucleoprotamine DNA, which demonstrated the existence of sequence-specific nucleohistone and nucleoprotamine components within the human spermatozoon.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Gatewood, J M -- Cook, G R -- Balhorn, R -- Bradbury, E M -- Schmid, C W -- GM-07377/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1987 May 22;236(4804):962-4.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3576213" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Chromatin/*physiology ; Cloning, Molecular ; DNA/*genetics/isolation & purification/metabolism ; Histones/isolation & purification ; Humans ; Male ; Nucleic Acid Hybridization ; Nucleoproteins/isolation & purification ; Spermatozoa/*physiology
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 42
    Publikationsdatum: 1987-08-21
    Beschreibung: The genome of the human immunodeficiency virus HIV-1 contains at least eight genes, of which three (sor, R, and 3' orf) have no known function. In this study, the role of the sor gene was examined by constructing a series of proviral genomes of HIV-1 that either lacked the coding sequences for sor or contained point mutations in sor. Analysis of four such mutants revealed that although each clone could generate morphologically normal virus particles upon transfection, the mutant viruses were limited in their capacity to establish stable infection. Virus derived from transfection of Cos-1 cells (OKT4-) with sor mutant proviral DNA's was resistant to transmission to OKT4+ "susceptible" cells under cell-free conditions, and was transmitted poorly by coculture. In contrast, virus derived from clones with an intact sor frame was readily propagated by either approach. Normal amounts of gag-, env-, and pol-derived proteins were produced by all four mutants and assays in both lymphoid and nonlymphoid cells indicated that their trans-activating capacity was intact and comparable with wild type. Thus the sor gene, although not absolutely required in HIV virion formation, influences virus transmission in vitro and is crucial in the efficient generation of infectious virus. The data also suggest that sor influences virus replication at a novel, post-translational stage and that its action is independent of the regulatory genes tat and trs.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Fisher, A G -- Ensoli, B -- Ivanoff, L -- Chamberlain, M -- Petteway, S -- Ratner, L -- Gallo, R C -- Wong-Staal, F -- New York, N.Y. -- Science. 1987 Aug 21;237(4817):888-93.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3497453" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Cell Communication ; Cells, Cultured ; Cercopithecus aethiops ; Cytopathogenic Effect, Viral ; Genes, Viral ; HIV/*genetics ; T-Lymphocytes/microbiology ; Viral Proteins/*physiology ; *Virus Replication
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 43
    facet.materialart.
    Unbekannt
    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1987-05-15
    Beschreibung: Allowing mice access to food immediately after an aversive training session enhances memory retention. Cholecystokinin-octapeptide (CCK-8), which is a gastrointestinal hormone released during feeding, also enhances memory retention when administered intraperitoneally. This memory-enhancing effect of CCK-8 is blocked when the vagus nerve is cut, indicating that CCK-8 may produce its effect on memory retention by activating ascending fibers in the vagus nerve. Thus, CCK-8, a peripherally acting peptide, may mediate the memory-enhancing effects of feeding.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Flood, J F -- Smith, G E -- Morley, J E -- New York, N.Y. -- Science. 1987 May 15;236(4803):832-4.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3576201" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Avoidance Learning/drug effects ; Electroshock ; Male ; Memory/*drug effects ; Mice ; Mice, Inbred Strains ; Sincalide/*pharmacology ; Vagotomy ; Vagus Nerve/drug effects/*physiology
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 44
    Publikationsdatum: 1987-01-30
    Beschreibung: In seven right-handed adults, the brain electrical patterns before accurate performance differed from the patterns before inaccurate performance. Activity overlying the left frontal cortex and the motor and parietal cortices contralateral to the performing hand preceded accurate left- or right-hand performance. Additional strong activity overlying midline motor and premotor cortices preceded left-hand performance. These measurements suggest that brief, spatially distributed neural activity patterns, or "preparatory sets," in distinct cognitive, somesthetic-motor, and integrative motor areas of the human brain may be essential precursors of accurate visuomotor performance.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Gevins, A S -- Morgan, N H -- Bressler, S L -- Cutillo, B A -- White, R M -- Illes, J -- Greer, D S -- Doyle, J C -- Zeitlin, G M -- New York, N.Y. -- Science. 1987 Jan 30;235(4788):580-5.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3810158" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Adult ; Cerebral Cortex/*physiology ; Cognition/physiology ; Electroencephalography ; Electrophysiology ; Functional Laterality ; Humans ; Male ; Motor Activity/physiology ; Time Factors ; Visual Perception/physiology
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  • 45
    facet.materialart.
    Unbekannt
    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1987-01-16
    Beschreibung: Second messenger systems may modulate neuronal activity through protein phosphorylation. However, interactions between two major second messenger pathways, the cyclic AMP and phosphatidylinositol systems, are not well understood. The effects of activators of cyclic AMP-dependent protein kinase and protein kinase C on resting membrane properties, action potentials, and currents recorded from mouse dorsal root ganglion neurons and cerebral hemisphere neurons grown in primary dissociated cell culture were investigated. Neither forskolin (FOR) nor phorbol 12,13-dibutyrate (PDBu) altered resting membrane properties but both increased the duration of calcium-dependent action potentials in both central and peripheral neurons. By means of the single-electrode voltage clamp technique, FOR and PDBu were shown to decrease the same voltage-dependent potassium conductance. This suggests that two independent second messenger systems may affect the same potassium conductance.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Grega, D S -- Werz, M A -- Macdonald, R L -- NS 07231/NS/NINDS NIH HHS/ -- NS 19613/NS/NINDS NIH HHS/ -- NS 19692/NS/NINDS NIH HHS/ -- New York, N.Y. -- Science. 1987 Jan 16;235(4786):345-8.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2432663" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Action Potentials/*drug effects ; Animals ; Brain/cytology ; Calcium/physiology ; Cells, Cultured ; Colforsin/*pharmacology ; Electric Conductivity ; Ganglia, Spinal/cytology ; Ion Channels/physiology ; Membrane Potentials ; Mice ; Neurons/drug effects/*physiology ; Phorbol Esters/*pharmacology ; Potassium/*physiology
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 46
    facet.materialart.
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1987-12-04
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lewin, R -- New York, N.Y. -- Science. 1987 Dec 4;238(4832):1350-1.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3685985" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; *Behavior, Animal ; *Deception ; Female ; Male ; Primates
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 47
    Publikationsdatum: 1987-08-07
    Beschreibung: Human peripheral blood eosinophils, cells often associated with allergic and parasitic diseases, were maintained in vitro for at least 14 days when they were cocultured with bovine endothelial cells and for at least 7 days when cultured with either bovine or human endothelial cell-derived conditioned medium. The cocultured eosinophils became hypodense and generated about three times as much leukotriene C4 upon activation with calcium ionophore and killed about three times as many antibody-coated larvae of Schistosoma mansoni as freshly isolated normodense eosinophils. That these cells can be maintained in vitro by coculture with endothelial cells, and the surprising finding that the cocultured eosinophils have biochemical, cytotoxic, and density properties similar to those of eosinophils in patients with allergic and other disorders, will facilitate investigation of the regulation and role of these cells in health and disease.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Rothenberg, M E -- Owen, W F Jr -- Silberstein, D S -- Soberman, R J -- Austen, K F -- Stevens, R L -- AI-22531/AI/NIAID NIH HHS/ -- AI-23483/AI/NIAID NIH HHS/ -- AM-01401/AM/NIADDK NIH HHS/ -- etc. -- New York, N.Y. -- Science. 1987 Aug 7;237(4815):645-7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3110954" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Antibody-Dependent Cell Cytotoxicity ; Calcimycin/pharmacology ; Cattle ; *Cell Communication ; Cell Survival ; Cells, Cultured ; Endothelium/*cytology ; Eosinophils/*cytology ; Humans ; SRS-A/biosynthesis ; Schistosoma mansoni/immunology ; Time Factors
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 48
    facet.materialart.
    Unbekannt
    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1987-12-04
    Beschreibung: The establishment of a cell culture system for the clonal development of blood cells has made it possible to identify the proteins that regulate the growth and differentiation of different blood cell lineages and to discover the molecular basis of normal and abnormal cell development in blood forming tissues. A model system with myeloid blood cells has shown that (i) normal blood cells require different proteins to induce cell multiplication (growth inducers) and cell differentiation (differentiation inducers), (ii) there is a hierarchy of growth inducers as cells become more restricted in their developmental program, and (iii) a cascade of interactions between proteins determines the correct balance between immature and mature cells in normal blood cell development. Gene cloning has shown that there is a family of different genes for these proteins. Normal protein regulators of blood cell development can control the abnormal growth of certain types of leukemic cells and suppress malignancy by inducing differentiation to mature nondividing cells. Chromosome abnormalities that give rise to malignancy in these leukemic cells can be bypassed and their effects nullified by inducing differentiation, which stops cells from multiplying. These blood cell regulatory proteins are active in culture and in the body, and they can be used clinically to correct defects in blood cell development.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sachs, L -- New York, N.Y. -- Science. 1987 Dec 4;238(4832):1374-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Genetics, Weizmann Institute of Science, Rehovot, Israel.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3317831" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Bone Marrow Cells ; Cell Differentiation/drug effects ; Cells, Cultured ; Clone Cells/cytology ; Colony-Stimulating Factors/physiology/therapeutic use ; *Hematopoiesis/drug effects ; Hematopoietic Stem Cells/cytology ; Humans ; Interleukin-3/physiology/therapeutic use ; Leukemia, Myeloid/drug therapy/physiopathology ; Mice ; Neoplastic Stem Cells/drug effects/pathology
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 49
    facet.materialart.
    Unbekannt
    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1987-01-30
    Beschreibung: Fertilization of eggs by sperm, the means by which sexual reproduction takes place in nearly all multicellular organisms, is fundamental to the maintenance of life. In both mammals and nonmammals, the pathway that leads to fusion of an egg with a single sperm consists of many steps that occur in a compulsory order. These steps include species-specific cellular recognition, intracellular and intercellular membrane fusions, and enzyme-catalyzed modifications of cellular investments. In several instances, the molecular mechanisms that underlie these events during mammalian fertilization are beginning to be revealed.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wassarman, P M -- New York, N.Y. -- Science. 1987 Jan 30;235(4788):553-60.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3027891" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Acrosome/physiology ; Animals ; *Fertilization ; Glycoproteins/physiology ; Humans ; Male ; Membrane Fusion ; Mice ; Ovum/*physiology ; Receptors, Cell Surface/physiology ; Sea Urchins ; Spermatozoa/*physiology
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 50
    Publikationsdatum: 1987-10-23
    Beschreibung: There is now evidence that the immune system, during times of infectious challenge, can stimulate the secretion of glucocorticoids, the adrenal steroids that mediate important aspects of the response to stress. Specifically, secretion of interleukin-1 (IL-1), a monocyte lymphokine secreted after infection, appears at least in part responsible for this effect. Glucocorticoids are secreted in response to a neuroendocrine cascade involving, first, the brain, then the pituitary, and finally the adrenal gland. In this report, human IL-1 is shown to activate the adrenocortical axis at the level of the brain, stimulating the release of the controlling hormone corticotropin-releasing factor (CRF) from the hypothalamus. Infusion of IL-1 induced a significant secretion of CRF into the circulation exiting the hypothalamus, whereas immunoneutralization of CRF blocked the stimulatory effect of IL-1 on glucocorticoid secretion. IL-1 appeared to have no acute direct stimulatory effects on the pituitary or adrenal components of this system. Furthermore, IL-1 did not cause a nonspecific release of other hypothalamic hormones. Thus, the lymphokine acts in a specific manner to activate the adrenocortical axis at the level of the brain; this effect appears to be unrelated to the known pyrogenic effects of IL-1 within the hypothalamus.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sapolsky, R -- Rivier, C -- Yamamoto, G -- Plotsky, P -- Vale, W -- AA06420/AA/NIAAA NIH HHS/ -- AM26741/AM/NIADDK NIH HHS/ -- New York, N.Y. -- Science. 1987 Oct 23;238(4826):522-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biological Sciences, Stanford University, CA 94305.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2821621" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Adrenal Cortex/physiology ; Adrenocorticotropic Hormone/secretion ; Animals ; Cell Line ; Corticosterone/secretion ; Corticotropin-Releasing Hormone/*secretion ; Hypothalamus/*secretion ; Immunologic Techniques ; Interleukin-1/*physiology ; Male ; Pituitary Gland, Anterior/secretion ; Pituitary Neoplasms/secretion ; Rats ; Rats, Inbred Strains
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 51
    facet.materialart.
    Unbekannt
    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1987-07-24
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Segal, S L -- New York, N.Y. -- Science. 1987 Jul 24;237(4813):350.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3603021" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): *Anxiety ; Female ; Gender Identity ; Humans ; Male ; *Mathematics ; Students ; Universities ; *Women
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 52
    Publikationsdatum: 1987-05-08
    Beschreibung: In a variety of human genetic diseases, replacement of the absent or defective protein provides significant therapeutic benefits. As a model for a somatic cell gene therapy system, cultured murine fibroblasts were transfected with a human growth hormone (hGH) fusion gene and cells from one of the resulting clonal lines were subsequently implanted into various locations in mice. Such implants synthesized and secreted hGH, which was detectable in the serum. The function of the implants depended on their location and size, and on the histocompatibility of the donor cells with their recipients. The expression of hGH could be modified by addition of regulatory effectors, and, with appropriate immunosuppression, the implants survived for more than 3 months. This approach to gene therapy, here termed "transkaryotic implantation," is potentially applicable to many genetic diseases in that the transfected cell line can be extensively characterized prior to implantation, several anatomical sites are suitable for implantation, and regulated expression of the gene of therapeutic interest can be obtained.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Selden, R F -- Skoskiewicz, M J -- Howie, K B -- Russell, P S -- Goodman, H M -- AM-07055/AM/NIADDK NIH HHS/ -- New York, N.Y. -- Science. 1987 May 8;236(4802):714-8.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3472348" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Cells, Cultured ; DNA, Recombinant ; Fibroblasts/immunology/*transplantation ; *Genetic Engineering ; Graft Survival ; Growth Hormone/biosynthesis/*genetics ; Humans ; Immunosuppression ; Kidney ; Kinetics ; Mice ; Mice, Inbred C3H ; Mice, Inbred C57BL ; Plasmids ; Therapeutics ; Transfection
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 53
    Publikationsdatum: 1987-07-31
    Beschreibung: The decline in the high incidence of amyotrophic lateral sclerosis, parkinsonism, and Alzheimer-type dementia among the Chamorro population of the western Pacific islands of Guam and Rota, coupled with the absence of demonstrable viral and hereditable factors in this disease, suggests the gradual disappearance of an environmental factor selectively associated with this culture. One candidate is seed of the neurotoxic plant Cycas circinalis L., a traditional source of food and medicine which has been used less with the Americanization of the Chamorro people after World War II. Macaques were fed the Cycas amino acid beta-N-methylamino-L-alanine, a low-potency convulsant that has excitotoxic activity in mouse brain, which is attenuated by N-methyl-D-aspartate receptor antagonists. These animals developed corticomoto-neuronal dysfunction, parkinsonian features, and behavioral anomalies, with chromatolytic and degenerative changes of motor neurons in cerebral cortex and spinal cord. In concert with existing epidemiological and animal data, these findings support the hypothesis that cycad exposure plays an important role in the etiology of the Guam disease.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Spencer, P S -- Nunn, P B -- Hugon, J -- Ludolph, A C -- Ross, S M -- Roy, D N -- Robertson, R C -- NS-19611/NS/NINDS NIH HHS/ -- New York, N.Y. -- Science. 1987 Jul 31;237(4814):517-22.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3603037" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Amino Acids, Diamino/*toxicity ; Amyotrophic Lateral Sclerosis/*chemically induced ; Animals ; Basal Ganglia Diseases/*chemically induced ; Environmental Exposure ; Guam ; Macaca fascicularis ; Male ; Motor Cortex/drug effects ; Motor Neurons/drug effects ; Neural Conduction/drug effects ; Neuromuscular Diseases/chemically induced ; Neurotoxins/*toxicity ; *Plants, Toxic ; Spinal Cord/drug effects ; Substantia Nigra/drug effects
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 54
    Publikationsdatum: 1987-05-29
    Beschreibung: Linkage analysis of 15 Utah kindreds demonstrated that a gene responsible for von Recklinghausen neurofibromatosis (NF) is located near the centromere on chromosome 17. The families also gave no evidence for heterogeneity, indicating that a significant proportion of NF cases are due to mutations at a single locus. Further genetic analysis can now refine this localization and may lead to the eventual identification and cloning of the defective gene responsible for this disorder.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Barker, D -- Wright, E -- Nguyen, K -- Cannon, L -- Fain, P -- Goldgar, D -- Bishop, D T -- Carey, J -- Baty, B -- Kivlin, J -- CA 28854/CA/NCI NIH HHS/ -- CA 36362/CA/NCI NIH HHS/ -- GM 29090/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1987 May 29;236(4805):1100-2.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3107130" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Centromere ; Chromosome Mapping ; *Chromosomes, Human, Pair 17/ultrastructure ; DNA, Recombinant ; Female ; *Genes ; Genetic Linkage ; Humans ; Male ; Neurofibromatosis 1/*genetics ; Nucleic Acid Hybridization
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 55
    facet.materialart.
    Unbekannt
    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1987-04-24
    Beschreibung: Clinical, genetic, and neuropsychopharmacological studies of developmental factors in alcoholism are providing a better understanding of the neurobiological bases of personality and learning. Studies of the adopted-away children of alcoholics show that the predisposition to initiate alcohol-seeking behavior is genetically different from susceptibility to loss of control after drinking begins. Alcohol-seeking behavior is a special case of exploratory appetitive behavior and involves different neurogenetic processes than do susceptibility to behavioral tolerance and dependence on the antianxiety or sedative effects of alcohol. Three dimensions of personality have been described that may reflect individual differences in brain systems modulating the activation, maintenance, and inhibition of behavioral responses to the effects of alcohol and other environmental stimuli. These personality traits distinguish alcoholics with different patterns of behavioral, neurophysiological, and neuropharmacological responses to alcohol.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Cloninger, C R -- AA-003539/AA/NIAAA NIH HHS/ -- MH-00048/MH/NIMH NIH HHS/ -- MH-31302/MH/NIMH NIH HHS/ -- New York, N.Y. -- Science. 1987 Apr 24;236(4800):410-6.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2882604" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Alcoholism/etiology/genetics/*physiopathology/psychology ; Appetite/physiology ; Avoidance Learning/physiology ; Behavior/physiology ; Extinction, Psychological ; Female ; Male ; Neurotransmitter Agents/physiology ; Reinforcement (Psychology)
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 56
    Publikationsdatum: 1987-05-22
    Beschreibung: To explore the potential use of retrovirus vectors for the transfer of genomic DNA sequences into mammalian cells, recombinant retroviral genomes were constructed that encode a functionally rearranged murine lambda 1 immunoglobulin gene. Several of these genomes could be transmitted intact to recipient cells by viral infection, although successful transmission depended both on the orientation of the lambda 1 sequences and on their specific placement within vector sequences. The lambda 1 gene transduced by viral infection was expressed in a cell lineage-specific manner, albeit at lower levels than endogenous lambda 1 gene expression in cells from the B-lymphocyte lineage. Vectors yielding integrated proviruses that lacked viral transcriptional enhancer sequences were used to show that neither viral transcription nor the viral transcriptional sequences themselves had any effect on the tissue specificity of lambda 1 gene expression or the absolute amount of lambda 1 transcription. Vector transcription did, however, dramatically decrease the amount of lambda 1 protein that could be detected in tranduced cells. These results suggest that retrovirus vectors may be useful reagents not only for the expression of complementary DNA sequences but also for studies of tissue-specific transcription in mammalian cells.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Cone, R D -- Reilly, E B -- Eisen, H N -- Mulligan, R C -- CA26712/CA/NCI NIH HHS/ -- CA38497/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1987 May 22;236(4804):954-7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3107128" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; B-Lymphocytes/immunology ; Cells, Cultured ; Enhancer Elements, Genetic ; *Genes ; *Genes, Viral ; Genetic Vectors ; Immunoglobulin lambda-Chains/*genetics ; Retroviridae/*genetics ; *Transcription, Genetic
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 57
    Publikationsdatum: 1987-05-01
    Beschreibung: Mammalian X-chromosome inactivation involves a coordinate shutting down of physically linked genes. Several proposed models require the presence of specific sequences near genes to permit the spread of inactivation into these regions. If such models are correct, one might predict that heterologous genes transferred onto the X chromosome might lack the appropriate signal sequences and therefore escape inactivation. To determine whether a foreign gene inserted into the X chromosome is subject to inactivation, transgenic mice harboring 11 copies of the complete, 17-kilobase chicken transferrin gene on the X chromosome were used. Male mice hemizygous for this insert were bred with females bearing Searle's translocation, an X-chromosome rearrangement that is always active in heterozygous females (the unrearranged X chromosome is inactive). Female offspring bearing the Searle's translocation and the chicken transferrin gene had the same amount of chicken transferrin messenger RNA in liver as did transgenic male mice or transgenic female mice lacking the Searle's chromosome. This result shows that the inserted gene is not subject to X-chromosome inactivation and suggests that the inactivation process cannot spread over 187 kilobases of DNA in the absence of specific signal sequences required for inactivation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Goldman, M A -- Stokes, K R -- Idzerda, R L -- McKnight, G S -- Hammer, R E -- Brinster, R L -- Gartler, S M -- HD14412/HD/NICHD NIH HHS/ -- HD16659/HD/NICHD NIH HHS/ -- HD17321/HD/NICHD NIH HHS/ -- New York, N.Y. -- Science. 1987 May 1;236(4801):593-5.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2437652" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Chickens ; DNA/metabolism ; *Dosage Compensation, Genetic ; Female ; Male ; Methylation ; Mice ; Transferrin/*genetics ; *Transformation, Genetic ; Translocation, Genetic ; X Chromosome ; Y Chromosome ; alpha-Fetoproteins/genetics
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 58
    facet.materialart.
    Unbekannt
    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1987-01-23
    Beschreibung: Previous studies have shown that cytotoxic activated macrophages cause inhibition of DNA synthesis, of mitochondrial respiration, and of aconitase activity in tumor target cells. An L-arginine-dependent biochemical pathway synthesizing L-citrulline and nitrite, coupled to an effector mechanism, is now shown to cause this pattern of metabolic inhibition. Murine cytotoxic activated macrophages synthesize L-citrulline and nitrite in the presence of L-arginine but not D-arginine. L-Citrulline and nitrite biosynthesis by cytotoxic activated macrophages is inhibited by NG-monomethyl-L-arginine, which also inhibits this cytotoxic effector mechanism. This activated macrophage cytotoxic effector system is associated with L-arginine deiminase activity, and the imino nitrogen removed from the guanido group of L-arginine by the deiminase reaction subsequently undergoes oxidation to nitrite. L-Homoarginine, an alternative substrate for this deiminase, is converted to L-homocitrulline with concurrent nitrite synthesis and similar biologic effects.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hibbs, J B Jr -- Taintor, R R -- Vavrin, Z -- New York, N.Y. -- Science. 1987 Jan 23;235(4787):473-6.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2432665" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Ammonia/biosynthesis ; Animals ; Cells, Cultured ; Citrulline/biosynthesis ; Cytotoxicity, Immunologic ; Homoarginine/metabolism ; Hydrolases/metabolism ; *Macrophage Activation ; Macrophages/*physiology ; Mice ; Nitrates/metabolism ; Nitrites/metabolism
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 59
    facet.materialart.
    Unbekannt
    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1987-05-22
    Beschreibung: Macrophages that rapidly enter injured peripheral nerve synthesize and secrete large quantities of apolipoprotein E. This protein may be involved in the redistribution of lipid, including cholesterol released during degeneration, to the regenerating axons. To test this postulate, apolipoprotein E-associated lipid particles released from segments of injured rat sciatic nerve and apolipoprotein E-containing lipoproteins from plasma were used to determine whether sprouting neurites, specifically their growth cones, possessed lipoprotein receptors. Pheochromocytoma (PC12) cells, which can be stimulated to produce neurites in vitro, were used as a model system. Apolipoprotein E-containing lipid particles and lipoproteins, which had been labeled with fluorescent dye, were internalized by the neurites and their growth cones; the unmetabolized dye appeared to be localized to the lysosomes. The rapid rate of accumulation in the growth cones precludes the possibility of orthograde transport of the fluorescent particles from the PC12 cell bodies. Thus, receptor-mediated lipoprotein uptake is performed by the apolipoprotein B,E(LDL) (low density lipoprotein) receptors, and in the regenerating peripheral nerve apolipoprotein E may deliver lipids to the neurites and their growth cones for membrane biosynthesis.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ignatius, M J -- Shooter, E M -- Pitas, R E -- Mahley, R W -- MH 17047/MH/NIMH NIH HHS/ -- NS 04270/NS/NINDS NIH HHS/ -- New York, N.Y. -- Science. 1987 May 22;236(4804):959-62.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3576212" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Adrenal Gland Neoplasms ; Animals ; Apolipoproteins E/*metabolism ; Axons/ultrastructure ; Cell Line ; Cells, Cultured ; Neurons/*cytology/metabolism ; Pheochromocytoma ; Rats ; Sciatic Nerve/*cytology/metabolism
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 60
    Publikationsdatum: 1987-12-11
    Beschreibung: Peptides corresponding to the amino-terminal region of the parathyroid hormone-related protein (PTHrP) of humoral hypercalcemia of malignancy were synthesized. A 34-amino acid peptide, PTHrP(1-34), was two to four times more potent than bovine or human PTH(1-34) in bioassays promoting the formation of adenosine 3',5'-monophosphate (cAMP) and plasminogen activator activity in osteogenic sarcoma cells and adenylate cyclase activity in chick kidney membranes. Like parathyroid hormone itself, in which the activity resides in the first 34 residues, PTHrP peptides of less than 30 residues from the amino terminus showed substantially reduced activity. PTHrP(1-34) had only 6% of the potency of bovine PTH(1-34) in promoting bone resorption in vitro. PTHrP(1-34) strongly promoted the excretion of cAMP and phosphorus and reduced the excretion of calcium in the isolated, perfused rat kidney consistent with the symptoms seen in malignant hypercalcemia.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kemp, B E -- Moseley, J M -- Rodda, C P -- Ebeling, P R -- Wettenhall, R E -- Stapleton, D -- Diefenbach-Jagger, H -- Ure, F -- Michelangeli, V P -- Simmons, H A -- New York, N.Y. -- Science. 1987 Dec 11;238(4833):1568-70.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉University of Melbourne, Department of Medicine, Repatriation General Hospital, Heidelberg, Victoria, Australia.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3685995" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Bone Resorption/*drug effects ; Bone and Bones/metabolism ; Calcium/metabolism ; Cattle ; Cells, Cultured ; Humans ; Hypercalcemia/etiology ; Neoplasms/*physiopathology ; Parathyroid Hormone/*pharmacology/physiology ; Peptide Fragments/*pharmacology/physiology ; Structure-Activity Relationship ; Teriparatide
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 61
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1987-11-20
    Beschreibung: Two different assays for B cell growth factors (BCGF) and an antibody against lymphotoxin were used to show that the presence of lymphotoxin in conditioned media derived from normal activated T cells and in a partially purified BCGF accounts for a substantial portion of their B cell growth-promoting activity. A competitive binding assay confirmed the presence of significant amounts of lymphotoxin in the partially purified BCGF. Recombinant lymphotoxin enhanced the proliferation of activated B cells and augmented B cell proliferation and immunoglobulin secretion induced by interleukin-2.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kehrl, J H -- Alvarez-Mon, M -- Delsing, G A -- Fauci, A S -- New York, N.Y. -- Science. 1987 Nov 20;238(4830):1144-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratory of Immunoregulation, National Institute of Allergy and Infectious Diseases, Bethesda, MD 20892.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3500512" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Antibody Formation/drug effects ; B-Lymphocytes/*cytology ; Cell Differentiation/drug effects ; Cells, Cultured ; DNA/biosynthesis ; Growth Substances/*physiology ; Humans ; In Vitro Techniques ; Interleukin-4 ; *Interleukins ; Lymphocyte Activation ; Lymphotoxin-alpha/*physiology ; Recombinant Proteins/pharmacology ; T-Lymphocytes/*physiology
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    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
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  • 62
    Publikationsdatum: 1987-05-15
    Beschreibung: Human immunodeficiency virus (HIV) is the causative agent of the acquired immune deficiency syndrome (AIDS). A large number of AIDS patients show evidence of neurologic involvement, known as AIDS-related subacute encephalopathy, which has been correlated with the presence of HIV in the brain. In this study, two genetically distinct but related viruses were isolated from one patient from two different sources in the central nervous system: brain tissue and cerebrospinal fluid. Both viruses were found to replicate in peripheral blood lymphocytes, but only virus from brain tissue will efficiently infect macrophage/monocytes. The viruses also differ in their ability to infect a brain glioma explant culture. This infection of the brain-derived cells in vitro is generally nonproductive, and appears to be some form of persistent or latent infection. These results indicate that genetic variation of HIV in vivo may result in altered cell tropisms and possibly implicate strains of HIV with glial cell tropism in the pathogenesis of some neurologic disorders of AIDS.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Koyanagi, Y -- Miles, S -- Mitsuyasu, R T -- Merrill, J E -- Vinters, H V -- Chen, I S -- New York, N.Y. -- Science. 1987 May 15;236(4803):819-22.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3646751" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Acquired Immunodeficiency Syndrome/*microbiology/pathology ; Brain/*microbiology/pathology ; Cells, Cultured ; HIV/isolation & purification ; Humans ; Lymphocyte Activation ; Lymphocytes/immunology/microbiology ; Macrophages/microbiology ; Monocytes/microbiology ; Species Specificity ; Virus Replication
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 63
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    Unbekannt
    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1987-05-22
    Beschreibung: The American family income distribution now lies at the center of several controversies. Some observers argue that the American middle class is vanishing, but U.S. census income statistics show income inequality has not changed appreciably since 1947. A second controversy involves whether average living standards have risen or fallen since the major oil price increase of 1973-74. These controversies can be partially resolved by understanding the sharp slowdown in the growth of workers' wages which occurred after 1973 and the demographic trends which kept per capita living standards rising despite stagnant wages, including more working women and low birthrates.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Levy, F -- New York, N.Y. -- Science. 1987 May 22;236(4804):923-7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3576210" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Adult ; Demography ; Female ; Humans ; *Income ; Male ; Middle Aged ; Social Class ; *Socioeconomic Factors ; United States
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 64
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    Unbekannt
    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1987-05-15
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lewin, R -- New York, N.Y. -- Science. 1987 May 15;236(4803):775-7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3576197" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Animals, Wild ; Female ; Male ; *Social Behavior ; Species Specificity
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 65
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1987-08-07
    Beschreibung: Factors that regulate synaptic specificity were investigated with Aplysia buccal and bag cell neurons in primary cell culture. In the presence of fetal calf serum electrical synapses are formed between buccal-buccal or bag-bag cell pairs, but not between buccal-bag cell pairs. Instead, buccal neurons make inhibitory chemical synapses on bag cells. However, in the presence of nanomolar concentrations of the lectin concanavalin A this pattern changes, such that more than 75 percent of buccal-bag pairs exhibit electrical synapses and the frequency of occurrence of buccal-bag chemical synapses is reduced. Such changes in synaptic specificity may be important in determining the types of synapses formed during neuronal development and neurite regeneration.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lin, S S -- Levitan, I B -- New York, N.Y. -- Science. 1987 Aug 7;237(4815):648-50.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3603045" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Aplysia ; Cell Communication ; Cells, Cultured ; Concanavalin A/*pharmacology ; Microelectrodes ; Neurons/*drug effects ; Organ Specificity ; Synapses/*drug effects
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 66
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    Unbekannt
    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1987-02-27
    Beschreibung: Although hypothyroidism (with concomitant increased levels of thyroid-stimulating hormone) has been associated with elevated plasma vasopressin, the role that vasopressin plays in controlling thyroid-stimulating hormone secretion from the adenohypophysis is not understood. In two in vitro pituitary cell systems, vasopressin caused a specific and dose-related release of thyroid-stimulating hormone from cells that was equal in potency to that elicited by thyrotropin-releasing hormone, the primary acknowledged regulator of thyroid-stimulating hormone release. When injected into the hypothalamus, however, vasopressin specifically inhibited the release of thyroid-stimulating hormone. Thus, vasopressin may exert differential regulatory effects on thyroid-stimulating hormone secretion in the hypothalamus and pituitary gland.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lumpkin, M D -- Samson, W K -- McCann, S M -- HD-09988/HD/NICHD NIH HHS/ -- New York, N.Y. -- Science. 1987 Feb 27;235(4792):1070-3.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2881350" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Arginine Vasopressin/*pharmacology/physiology ; Hypothalamus/drug effects/secretion ; Male ; Oxytocin/pharmacology ; Perfusion ; Pituitary Gland, Anterior/drug effects/*secretion ; Rats ; Rats, Inbred Strains ; Somatostatin/pharmacology ; Thyrotropin/*secretion ; Thyrotropin-Releasing Hormone/pharmacology
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 67
    Publikationsdatum: 1987-09-11
    Beschreibung: Human T-lymphotropic virus type 1 (HTLV-1) is a suspected causative agent of adult T-cell leukemia. One of the viral genes encodes a protein (tat) that not only results in transactivation of viral gene expression but may also regulate the expression of certain cellular genes that are important for cell growth. Transgenic mice that expressed the authentic tat protein under the control of the HTLV-1 long terminal repeat were generated, and cell types that are permissive for the viral promoter and the effects of the tat gene on these cells were studied. Three of eight founder mice with high levels of expression of the transgene in muscle were bred and then analyzed. All developed soft tissue tumors at multiple sites between 13 to 17 weeks of age. This phenotype was transmitted to nine of nine offspring that inherited the tat gene and were available for analysis. The remaining five founders expressed the transgene in the thymus, as well as in muscle. This second group of mice all exhibited extensive thymic depletion and growth retardation; in all of these mice, death occurred between 3 to 6 weeks of age before tumors became macroscopically visible. The tat gene under the control of the HTLV-1 regulatory region showed tissue-specific expression and the tat protein efficiently induced mesenchymal tumors. The data establish tat as an oncogenic protein and HTLV-1 as a transforming virus.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Nerenberg, M -- Hinrichs, S H -- Reynolds, R K -- Khoury, G -- Jay, G -- New York, N.Y. -- Science. 1987 Sep 11;237(4820):1324-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2888190" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Base Sequence ; Deltaretrovirus/*genetics ; Deltaretrovirus Infections/*genetics ; Female ; *Genes, Viral ; Genetic Engineering ; Genetic Vectors ; Male ; Mesenchymoma/genetics/*microbiology ; Mice ; Pedigree ; Plasmids ; Protein Biosynthesis ; Transcription, Genetic
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 68
    Publikationsdatum: 1987-05-29
    Beschreibung: Preneoplastic and neoplastic liver nodules and hepatocytes isolated from regenerating rat liver have been shown to be resistant to a broad range of carcinogenic agents. This phenomenon was studied by measuring the expression of the multidrug-resistant (mdr) gene in normal liver cells and in preneoplastic and neoplastic nodules and regenerating liver. Levels of messenger RNA for the mdr gene, which encodes P-glycoprotein, were elevated in both preneoplastic and neoplastic lesions. Expression of the mdr gene also reached high levels in regenerating rat liver 24 to 72 hours after partial hepatectomy. These results show that the expression of the mdr gene can be regulated in liver and is likely to be responsible for part of the multidrug-resistance phenotype of carcinogen-initiated hepatocytes and regenerating liver cells.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Thorgeirsson, S S -- Huber, B E -- Sorrell, S -- Fojo, A -- Pastan, I -- Gottesman, M M -- New York, N.Y. -- Science. 1987 May 29;236(4805):1120-2.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3576227" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Carcinogens/*pharmacology ; Drug Resistance/*genetics ; *Genes ; Humans ; Liver/drug effects ; Liver Neoplasms, Experimental/chemically induced ; Liver Regeneration/*drug effects ; Male ; Precancerous Conditions/chemically induced ; RNA, Messenger/genetics ; Rats
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 69
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    Unbekannt
    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1987-07-10
    Beschreibung: Some components of a speech signal, when made more intense, are heard simultaneously as speech and nonspeech--a form of duplex perception. At lower intensities, the speech alone is heard. Such intensity-dependent duplexity implies the existence of a phonetic mode of perception that takes precedence over auditory modes.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Whalen, D H -- Liberman, A M -- HD-01994/HD/NICHD NIH HHS/ -- New York, N.Y. -- Science. 1987 Jul 10;237(4811):169-71.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3603014" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Adult ; Attention ; Auditory Threshold ; Female ; Hearing ; Humans ; Male ; Perception ; *Phonetics ; Speech ; Speech Discrimination Tests ; *Speech Perception
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 70
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    Unbekannt
    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1987-10-16
    Beschreibung: Calcium influx is often an essential intermediate step for the release of neurotransmitter. However, some retinal neurons appear to release transmitter by a mechanism that does not require calcium influx. It was uncertain whether depolarization released calcium from an intracellular store or released transmitter by a mechanism that does not require calcium. The possibility that voltage, and not calcium, can regulate the release of transmitter was studied with pairs of solitary retinal neurons. Horizontal and bipolar cells were isolated from fish retinas and juxtaposed in culture. Communication between them was studied with electrophysiological methods. A horizontal cell released its neurotransmitter, gamma-aminobutyric acid, when depolarized during conditions that buffered the internal calcium concentration and prohibited calcium entry. The speed and amount of material released were sufficient for a contribution to synaptic transmission.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Schwartz, E A -- EY02440/EY/NEI NIH HHS/ -- New York, N.Y. -- Science. 1987 Oct 16;238(4825):350-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Pharmacological and Physiological Sciences, University of Chicago, IL 60637.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2443977" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Benzofurans ; Calcium/*physiology ; Catfishes ; Cell Communication ; Cell Membrane/physiology ; Cells, Cultured ; Chlorides/metabolism ; Egtazic Acid/analogs & derivatives/pharmacology ; Electrophysiology ; Fluorescent Dyes ; Fura-2 ; Ion Channels/physiology ; Neurons/drug effects/*physiology ; Nipecotic Acids/pharmacology ; Photoreceptor Cells/physiology ; *Proline/*analogs & derivatives ; Retina/*cytology/drug effects ; Synapses/physiology ; gamma-Aminobutyric Acid/pharmacology/*secretion
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 71
    facet.materialart.
    Unbekannt
    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1987-12-18
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Barnes, D M -- New York, N.Y. -- Science. 1987 Dec 18;238(4834):1651-3.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3686006" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Alzheimer Disease/*metabolism ; Amnesia/*psychology ; Brain/*physiopathology ; Genes ; Humans ; Infant ; Male ; *Memory ; Middle Aged ; Nerve Tissue Proteins/analysis ; *Nervous System Physiological Phenomena ; Receptors, Cholinergic/genetics ; tau Proteins
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 72
    Publikationsdatum: 1987-07-24
    Beschreibung: Adipsin is a serine protease homolog whose primary structure was predicted from the nucleotide sequence of a differentiation-dependent adipocyte messenger RNA. Immunoblots probed with antisera to synthetic peptides identify two forms of adipsin that are synthesized and secreted by 3T3 adipocytes. These proteins of 44 and 37 kilodaltons are converted to 25.5 kilodaltons by enzymatic deglycosylation. Although adipsin is principally synthesized in adipose tissue, it is also produced by sciatic nerve and is found in the bloodstream. Because of the apparent restriction of adipsin synthesis to tissues highly active in lipid metabolism, its presence in serum, and its modulation in altered metabolic states, this molecule may play a previously unrecognized role in systemic lipid metabolism or energy balance.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Cook, K S -- Min, H Y -- Johnson, D -- Chaplinsky, R J -- Flier, J S -- Hunt, C R -- Spiegelman, B M -- AM07230/AM/NIADDK NIH HHS/ -- AM31405/AM/NIADDK NIH HHS/ -- DK34605/DK/NIDDK NIH HHS/ -- New York, N.Y. -- Science. 1987 Jul 24;237(4813):402-5.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3299705" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Adipose Tissue/*enzymology ; Animals ; Cells, Cultured ; Complement Factor D ; Endopeptidases/blood/genetics/*secretion ; Male ; Mice ; Molecular Weight ; Organ Culture Techniques ; RNA, Messenger/genetics ; Sciatic Nerve/*enzymology ; *Serine Endopeptidases ; Transcription, Genetic
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 73
    Publikationsdatum: 1987-08-07
    Beschreibung: The first human vaccines against the malaria parasite have been designed to elicit antibodies to the circumsporozoite protein of Plasmodium falciparum. However, it is not known whether any level of naturally acquired antibodies to the circumsporozoite protein can predict resistance to Plasmodium falciparum malaria. In this study, 83 adults in a malaria-endemic region of Kenya were tested for circumsporozoite antibodies and then treated for malaria. They were monitored for the development of new malaria infections for 98 days. Antibody levels, as determined by four assays in vitro, were indistinguishable between the 60 individuals who did and the 23 who did not develop parasitemia during follow-up, and there was no apparent relation between day of onset of parasitemia and level of antibodies to circumsporozoite protein. Unless immunization with sporozoite vaccines induces antibodies that are quantitatively or qualitatively superior to the circumsporozoite antibodies in these adults, it is unlikely that such antibodies will prevent infection in areas with as intense malaria transmission as western Kenya.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hoffman, S L -- Oster, C N -- Plowe, C V -- Woollett, G R -- Beier, J C -- Chulay, J D -- Wirtz, R A -- Hollingdale, M R -- Mugambi, M -- New York, N.Y. -- Science. 1987 Aug 7;237(4815):639-42.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3299709" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Adult ; Antibodies/*analysis ; Antigens, Protozoan ; Antigens, Surface/*immunology ; Humans ; Kenya ; Malaria/*prevention & control ; Male ; Middle Aged ; Plasmodium falciparum/*immunology ; Prospective Studies ; *Protozoan Proteins ; Spores/immunology ; Time Factors ; *Vaccines
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 74
    facet.materialart.
    Unbekannt
    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1987-11-13
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Holden, C -- New York, N.Y. -- Science. 1987 Nov 13;238(4829):887.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3672132" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Acquired Immunodeficiency Syndrome/prevention & control ; *Advertising as Topic ; *Contraceptive Devices, Male ; *Contraceptives, Oral ; Female ; Humans ; Male ; *Television ; United States
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 75
    facet.materialart.
    Unbekannt
    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1987-08-28
    Beschreibung: Dementia is common in patients with AIDS, but the mechanism by which the human immunodeficiency virus type 1 (HIV-1) causes the neurological impairment is unknown. In this study the possibility that an antigen of HIV-1 suppresses neuronal responses to neurotrophic factors was examined. Both HIV-1 and a related retrovirus, simian immunodeficiency virus (SIV), inhibited the growth of sensory neurons from chick dorsal root ganglia in medium containing neuroleukin (NLK) but not in medium containing nerve growth factor. An unrelated type D retrovirus, simian acquired immunodeficiency syndrome virus, did not affect the growth of neurons in the presence of either neurotrophic factor. The inhibition by HIV-1 of neuron growth in the presence of NLK was found to be due to the gp120 envelope glycoprotein. Regions of sequence homology between gp120 and NLK may account for this inhibitory property of gp120 and functional interactions between gp120 and NLK may be important in the pathogenesis of the AIDS dementia complex.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lee, M R -- Ho, D D -- Gurney, M E -- 5P01 NS-21443/NS/NINDS NIH HHS/ -- K08-AI00685/AI/NIAID NIH HHS/ -- New York, N.Y. -- Science. 1987 Aug 28;237(4818):1047-51.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3039662" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Acquired Immunodeficiency Syndrome/microbiology ; Brain/microbiology ; Cells, Cultured ; Ganglia, Spinal/drug effects ; Glucose-6-Phosphate Isomerase ; Growth Substances/*genetics/pharmacology ; HIV/*genetics ; HIV Envelope Protein gp120 ; Humans ; Lymphokines/*genetics/pharmacology ; Nerve Growth Factors/pharmacology ; Neurons, Afferent/drug effects ; Retroviridae Proteins/genetics/pharmacology ; Sequence Homology, Nucleic Acid ; Viral Envelope Proteins/genetics/pharmacology
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
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  • 76
    facet.materialart.
    Unbekannt
    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1987-03-06
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Miczek, K A -- Weerts, E M -- New York, N.Y. -- Science. 1987 Mar 6;235(4793):1127-8.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3823870" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Azides/*adverse effects ; Benzodiazepines/*adverse effects ; Male ; Rats ; Rats, Inbred Strains ; Saimiri ; Seizures/*chemically induced
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    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
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  • 77
    Publikationsdatum: 1987-12-04
    Beschreibung: The epidermal growth factor (EGF) receptor gene EGFR has been placed in a retrovirus vector to examine the growth properties of cells that experimentally overproduce a full-length EGF receptor. NIH 3T3 cells transfected with the viral DNA or infected with the corresponding rescued retrovirus developed a fully transformed phenotype in vitro that required both functional EGFR expression and the presence of EGF in the growth medium. Cells expressing 4 x 10(5) EGF receptors formed tumors in nude mice, while control cells did not. Therefore, the EGFR retrovirus, which had a titer on NIH 3T3 cells that was greater than 10(7) focus-forming units per milliliter, can efficiently transfer and express this gene, and increased numbers of EGF receptors can contribute to the transformed phenotype.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Velu, T J -- Beguinot, L -- Vass, W C -- Willingham, M C -- Merlino, G T -- Pastan, I -- Lowy, D R -- New York, N.Y. -- Science. 1987 Dec 4;238(4832):1408-10.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratory of Cellular Oncology, National Cancer Institute, Bethesda, MD 20892.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3500513" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Cell Transformation, Neoplastic/chemically induced/*genetics ; Cells, Cultured ; DNA, Recombinant ; Epidermal Growth Factor/*pharmacology ; Fibroblasts/pathology ; Genetic Vectors ; Harvey murine sarcoma virus/genetics ; Humans ; Male ; Mice ; Mice, Nude ; Neoplasms, Experimental/etiology ; *Proto-Oncogenes ; Receptor, Epidermal Growth Factor/drug effects/*genetics ; Recombinant Proteins/genetics
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 78
    Publikationsdatum: 1987-04-10
    Beschreibung: The development of Wilms' tumor, a pediatric nephroblastoma, has been associated with a deletion in the p13 region of chromosome 11. The structure and function or functions of this deleted genetic material are unknown. The role of this deletion in the process of malignant transformation was investigated by introducing a normal human chromosome 11 into a Wilms' tumor cell line by means of the microcell transfer technique. These variant cells, derived by microcell hybridization, expressed similar transformed traits in culture as the parental cell line. Furthermore, expression of several proto-oncogenes by the parental cells was unaffected by the introduction of this chromosome. However, the ability of these cells to form tumors in nude mice was completely suppressed. Transfer of other chromosomes, namely X and 13, had no effect on the tumorigenicity of the Wilms' tumor cells. These studies provide support for the existence of genetic information on chromosome 11 which can control the malignant expression of Wilms' tumor cells.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Weissman, B E -- Saxon, P J -- Pasquale, S R -- Jones, G R -- Geiser, A G -- Stanbridge, E J -- CA 19401/CA/NCI NIH HHS/ -- SO7RR05469-23/RR/NCRR NIH HHS/ -- New York, N.Y. -- Science. 1987 Apr 10;236(4798):175-80.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3031816" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Cell Transformation, Neoplastic/genetics ; Cells, Cultured ; *Chromosomes, Human, Pair 11 ; Gene Expression Regulation ; Humans ; Hybrid Cells ; Karyotyping ; Mice ; Mice, Nude ; Oncogenes ; Suppression, Genetic ; Wilms Tumor/*genetics/pathology
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 79
    facet.materialart.
    Unbekannt
    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1987-01-02
    Beschreibung: In an investigation of the mechanism by which brain lesions result in delayed degeneration of neurons remote from the site of injury, neurons within the caudate nucleus of rats were destroyed by local injection of the excitotoxin ibotenic acid. Treatment resulted in the rapid degeneration of the striatonigral pathway including projections containing the inhibitory neurotransmitter gamma-aminobutyric acid (GABA) and delayed transneuronal death of neurons in the substantia nigra pars reticulata. The distribution of nigral cell loss corresponded to the loss of GABAergic terminals. Neuronal death was prevented by long-term intraventricular infusion of the GABA agonist muscimol. Delayed transneuronal degeneration may be produced by neuronal disinhibition consequent to loss of inhibitory inputs. Replacement of inhibitory transmitters by suitable drugs may prevent some forms of delayed neuronal death.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Saji, M -- Reis, D J -- HL18974/HL/NHLBI NIH HHS/ -- NS03346/NS/NINDS NIH HHS/ -- New York, N.Y. -- Science. 1987 Jan 2;235(4784):66-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3798095" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Cell Survival/drug effects ; Ibotenic Acid/antagonists & inhibitors/pharmacology ; Male ; Muscimol/*pharmacology ; Nerve Degeneration/*drug effects ; Neural Inhibition ; Rats ; Substantia Nigra/*cytology/physiology ; gamma-Aminobutyric Acid/*physiology
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 80
    Publikationsdatum: 1987-09-04
    Beschreibung: Many spontaneous mutations are caused by the insertion or excision of DNA elements. Since most mutations are deleterious, evolution should favor a mechanism for genetically controlling the rate of movement of transposable elements in most, if not all, organisms. In Drosophila melanogaster a syndrome of correlated genetic changes, including mutation, chromosome breakage, and sterility, is observed in the hybrid progeny of crosses between different strains. This syndrome, which is termed hybrid dysgenesis, results from the movement of P-DNA elements. What is not clear is whether the movement of other types of transposable elements is under the same coordinated control. In this study the ability of hybrid dysgenesis to increase the rate of excision of 12 DNA elements at 16 mutant alleles and to induce insertion-bearing mutations to change to other mutant states was tested. The data show that hybrid dysgenesis caused by P-element transpositions does not act as a general stimulus for the movement of other Drosophila transposable elements.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Woodruff, R C -- Blount, J L -- Thompson, J N Jr -- K04-ES-00087/ES/NIEHS NIH HHS/ -- New York, N.Y. -- Science. 1987 Sep 4;237(4819):1206-18.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2820057" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Crosses, Genetic ; *DNA Transposable Elements ; Drosophila melanogaster/*genetics ; Female ; Gonadal Dysgenesis ; Hybridization, Genetic ; Male ; Mutation ; Probability
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 81
    facet.materialart.
    Unbekannt
    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1987-02-06
    Beschreibung: Calcium influx through voltage-gated membrane channels plays a crucial role in a variety of neuronal processes, including long-term potentiation and epileptogenesis in the mammalian cortex. Recent studies indicate that calcium channels in some cell types are heterogeneous. This heterogeneity has now been shown for calcium channels in mammalian cortical neurons. When dissociated embryonic hippocampal neurons from rat were grown in culture they first had only low voltage-activated, fully inactivating somatic calcium channels. These channels were metabolically stable and conducted calcium better than barium. Appearing later in conjunction with neurite outgrowth and eventually predominating in the dendrites, were high voltage-activated, slowly inactivating calcium channels. These were metabolically labile and more selective to barium than to calcium. Both types of calcium currents were reduced by classical calcium channel antagonists, but the low voltage-activated channels were more strongly blocked by the anticonvulsant drug phenytoin. These findings demonstrate the development and coexistence of two distinct types of calcium channels in mammalian cortical neurons.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Yaari, Y -- Hamon, B -- Lux, H D -- New York, N.Y. -- Science. 1987 Feb 6;235(4789):680-2.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2433765" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Barium/pharmacology ; Cadmium/pharmacology ; Calcium/*physiology ; Cell Differentiation ; Cells, Cultured ; Hippocampus/cytology/*physiology ; Ion Channels/classification/drug effects/*physiology ; Membrane Potentials ; Rats
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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