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  • 1
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    Nicotine activation of alpha4* receptors: sufficient for reward, tolerance, and sensitization (2004)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2004-11-06
    Description: The identity of nicotinic receptor subtypes sufficient to elicit both the acute and chronic effects of nicotine dependence is unknown. We engineered mutant mice with a4 nicotinic subunits containing a single point mutation, Leu9' --〉 Ala9' in the pore-forming M2 domain, rendering a4* receptors hypersensitive to nicotine. Selective activation of a4* nicotinic acetylcholine receptors with low doses of agonist recapitulates nicotine effects thought to be important in dependence, including reinforcement in response to acute nicotine administration, as well as tolerance and sensitization elicited by chronic nicotine administration. These data indicate that activation of a4* receptors is sufficient for nicotine-induced reward, tolerance, and sensitization.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Tapper, Andrew R -- McKinney, Sheri L -- Nashmi, Raad -- Schwarz, Johannes -- Deshpande, Purnima -- Labarca, Cesar -- Whiteaker, Paul -- Marks, Michael J -- Collins, Allan C -- Lester, Henry A -- DA-15663/DA/NIDA NIH HHS/ -- DA-3194/DA/NIDA NIH HHS/ -- MH-49716/MH/NIMH NIH HHS/ -- NS-11756/NS/NINDS NIH HHS/ -- New York, N.Y. -- Science. 2004 Nov 5;306(5698):1029-32.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Division of Biology, California Institute of Technology, Pasadena, CA 91125, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15528443" target="_blank"〉PubMed〈/a〉
    Keywords: Alkaloids/metabolism ; Animals ; Azocines/metabolism ; Bicyclo Compounds, Heterocyclic/metabolism ; Brain/drug effects/metabolism ; Calcium/metabolism ; Cells, Cultured ; *Drug Tolerance ; Leucine ; Mice ; Mice, Inbred C57BL ; Motor Activity/drug effects ; Neurons/metabolism ; Nicotine/*pharmacology ; Point Mutation ; Pyridines/metabolism ; Quinolizines/metabolism ; Receptors, Nicotinic/genetics/*physiology ; *Reward ; Serine ; Tobacco Use Disorder/*metabolism ; Up-Regulation
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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    PAPER CURRENT
  • 2
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    Hypoxic coordinate regulation of mitochondrial enzymes in mammalian cells (1984)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1984-02-17
    Description: The effect of hypoxic exposure on various mitochondrial enzymes and on cell mitochondrial genomic content was studied in two types of mammalian cells. Hypoxia depressed the activity of six enzymes to the same degree. The kinetics of depression and of recovery during reexposure to normoxia were statistically similar for three marker enzymes. Despite the global and symmetrical decrease in enzyme activities, mitochondrial DNA remained constant. This suggests either symmetrical loss of mitochondrial enzymes from all mitochondria or complete loss of enzymes from a subpopulation of mitochondria with retention of an intact mitochondrial genome.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Murphy, B J -- Robin, E D -- Tapper, D P -- Wong, R J -- Clayton, D A -- 5 R01 HL23701-14/HL/NHLBI NIH HHS/ -- New York, N.Y. -- Science. 1984 Feb 17;223(4637):707-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6320368" target="_blank"〉PubMed〈/a〉
    Keywords: Aerobiosis ; Anaerobiosis ; Animals ; Anoxia/physiopathology ; Citrate (si)-Synthase/genetics/*metabolism ; DNA, Mitochondrial/*genetics ; Electron Transport Complex IV/genetics/*metabolism ; Macrophages/*enzymology ; Mice ; Mitochondria/*enzymology ; Mitochondria, Muscle/*enzymology ; Oxidoreductases/genetics/*metabolism ; Oxo-Acid-Lyases/*metabolism ; Rats
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 3
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    ERTS-1 image enhancement by optically combining density slices (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The technique of density slicing using a photographic film and its application to enhancement of ERTS-1 imagery has proved to be useful for mapping varigated areal phenomena and provides a useful supplement ot the I2S MiniAddcol viewing system. The intial experiments conducted with this film were encouraging, and indicated that this technique of density slicing using readily accessible darkroom facilities and simple darkroom procedures allows rapid, accurate, and facile interpretation of certain areal phenomena to be made from the imagery. The distribution of the tree yucca, Yucca brevifolia Jaegeriana, in the eastern Mojave Desert of Southern California and southern Nevada was used as an example to test the accuracy of the technique for mapping purposes. The distribution was mapped at a relatively high level of accuracy.
    Keywords: GEOPHYSICS
    Type: PAPER-I11 , NASA. Goddard Space Flight Center Symp. on Significant Results obtained from the ERTS-1, Vol. 1, Sect. A and B; p 1179-1185
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    ERTS-1 image enhancement by optically combining density slices (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: ERTS-1 image enhancement by optically combining density slices
    Keywords: GEOPHYSICS
    Type: E73-10189 , PAPER-I11 , NASA. Goddard Space Flight Center Interpretation Tech. Develop.; p 131
    Format: text
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    NASA TECHNICAL REPORTS
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