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  • Cats  (37)
  • Chemistry
  • American Association for the Advancement of Science (AAAS)  (43)
  • 1975-1979  (43)
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  • 1
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    Benzo(a)pyrene-7,8-dihydrodiol 9,10-oxide adenosine and deoxyadenosine adducts: structure and stereochemistry (1979)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1979-12-14
    Description: The structure and absolute stereoconfigurations of four adenosine adducts with (+/-)-7 alpha,8 beta-dihydroxy-9 beta, 10 beta-epoxy-7,8,9,10-tetrahydrobenzo(a)pyrene (BPDE) and their deoxyadenosine analogs have been determined. They result from both cis and trans addition of the N6 amino group of ademine to the 10 position of both enantiomers of BDPE. This was determined from studies of the nuclear magnetic resonance spectra, mass spectra, and circular dichroism spectra, as well as from their pKa values and chemical reactivities.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Jeffrey, A M -- Grzeskowiak, K -- Weinstein, I B -- Nakanishi, K -- Roller, P -- Harvey, R G -- New York, N.Y. -- Science. 1979 Dec 14;206(4424):1309-11.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/316186" target="_blank"〉PubMed〈/a〉
    Keywords: *Benzopyrenes ; Chemical Phenomena ; Chemistry ; Circular Dichroism ; Dna ; *Deoxyadenosines/analogs & derivatives ; Magnetic Resonance Spectroscopy ; Mass Spectrometry ; Molecular Conformation ; Mutation ; Stereoisomerism
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 2
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    Choline excites cortical neurons (1979)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1979-12-14
    Description: In cats under halothane or methoxyflurane, iontophoretic applications of choline are only eight times weaker than applications of acetylcholine in evoking firing of neurons in the sensorimotor region of the cerebral cortex. The action of choline is suppressed by atropine but not by two agents that block choline uptake (hemicholinium-3 and triethylcholine), and is not potentiated by an anticholinesterase (physostigmine). Choline therefore appears to excite cortical neurons by a direct action, which may be a significant component of its beneficial therapeutic effects.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Krnjevic, K -- Reinhardt, W -- New York, N.Y. -- Science. 1979 Dec 14;206(4424):1321-3.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/515735" target="_blank"〉PubMed〈/a〉
    Keywords: Acetylcholine/pharmacology ; Action Potentials/drug effects ; Animals ; Cats ; Cerebral Cortex/*drug effects ; Choline/*pharmacology ; Drug Synergism ; Evoked Potentials ; Glutamates/pharmacology ; Hemicholinium 3/pharmacology ; Motor Cortex/physiology ; Physostigmine/pharmacology ; Receptors, Muscarinic/drug effects ; Stimulation, Chemical
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 3
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    Generation of unidirectionally propagated action potentials in a peripheral nerve by brief stimuli (1979)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1979-12-14
    Description: Single, unidirectionally propagated action potentials can be elicited in peripheral nerves by electrical stimuli of short duration. Propagation in one direction is blocked anodically by means of a quasi-trapezoidal stimulus wave form and a modified tripolar electrode configuration. Propagation in the other direction proceeds unhindered. This technique may be applicable to collision blocking of motor nerves for neural prostheses.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉van den Honert, C -- Mortimer, J T -- New York, N.Y. -- Science. 1979 Dec 14;206(4424):1311-2.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/515733" target="_blank"〉PubMed〈/a〉
    Keywords: *Action Potentials ; Animals ; Cats ; Electric Stimulation ; Electrodes ; Nerve Block/methods ; Peripheral Nerves/*physiology ; Sciatic Nerve/physiology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 4
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    Cortical plasticity in monocularly deprived immobilized kittens depends on eye movement (1979)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1979-11-30
    Description: A marked reduction of binocular cells in striate cortex is found if 4-week-old kittens are visually stimulated monocularly while anesthetized and held in a stereotaxic apparatus. If the kittens are paralyzed and artificially respirated, changes are not found unless an eye is moved mechanically. It appears that eye movement and visual stimulation are necessary conditions for deactivation of binocular connections, but neither is sufficient to induce such changes alone.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Freeman, R D -- Bonds, A B -- New York, N.Y. -- Science. 1979 Nov 30;206(4422):1093-5.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/493996" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cats ; Evoked Potentials ; *Eye Movements ; Functional Laterality ; Immobilization ; Paralysis/physiopathology ; Visual Cortex/*growth & development/physiology ; Visual Pathways/*growth & development
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 5
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    Functional organization of lateral geniculate cells following removal of visual cortex in the newborn kitten (1979)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1979-11-09
    Description: When the visual cortex of a newborn kitten is removed, most neurons in the dorsal lateral geniculate nucleus degenerate, but a small population of large cells is spared. Electrophysiological recording revealed that detailed visual topography in the nucleus is abnormal and that single cells have unusually large receptive fields. These results suggest that optic axons deprived of their normal synaptic targets rearrange their connections to converge on local surviving neurons.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Murphy, E H -- Kalil, R -- New York, N.Y. -- Science. 1979 Nov 9;206(4419):713-6.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/493978" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Animals, Newborn/anatomy & histology ; Cats ; Functional Laterality ; Geniculate Bodies/*cytology ; Nerve Degeneration ; Visual Cortex/*cytology ; Visual Pathways/*cytology/growth & development
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 6
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    Phase resetting and annihilation of pacemaker activity in cardiac tissue (1979)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1979-11-09
    Description: Spontaneous rhythmic activity in isolated cardiac pacemaker cells can be terminated by a brief, subthreshold, depolarizing or hyperpolarizing perturbation of the proper magnitude applied at a specific point in the pacemaker cycle. Evidence is provided in support of a topological theory of the existence of a "singular" point in cardiac oscillators.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Jalife, J -- Antzelevitch, C -- New York, N.Y. -- Science. 1979 Nov 9;206(4419):695-7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/493975" target="_blank"〉PubMed〈/a〉
    Keywords: Action Potentials ; Animals ; Cats ; Cattle ; Dogs ; Evaluation Studies as Topic ; Heart Conduction System/*physiology ; Membrane Potentials ; *Periodicity ; Purkinje Fibers/*physiology ; Sinoatrial Node/*physiology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 7
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    Response of cat inferior colliculus neurons to binaural beat stimuli: possible mechanisms for sound localization (1979)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1979-11-02
    Description: The interaural phase sensitivity of neurons was studied through the use of binaural beat stimuli. The response of most cells was phase-locked to the beat frequency, which provides a possible neural correlate to the human sensation of binaural beats. In addition, this stimulus allowed the direction and rate of interaural phase change to be varied. Some neurons in our sample responded selectively to manipulations of these two variables, which suggests a sensitivity to direction or speed of movement.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kuwada, S -- Yin, T C -- Wickesberg, R E -- New York, N.Y. -- Science. 1979 Nov 2;206(4418):586-8.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/493964" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Auditory Perception/*physiology ; Cats ; Evoked Potentials ; Inferior Colliculi/*physiology ; Motion Perception/physiology ; Orientation/*physiology ; Periodicity
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 8
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    Long-term amphetamine treatment decreases brain serotonin metabolism: implications for theories of schizophrenia (1979)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1979-09-21
    Description: Long-term amphetamine administration to cats (a mean of 8.75 milligrams per kilogram twice daily for 10 days) produced large decreases (40 to 67 percent in serotonin and its major metabolite, 5-hydroxyindoleacetic acid, in all brain regions examined. This treatment also produced several behaviors that are dependent on depressed central serotonergic neurotransmission, and which normally are elicited exclusively by hallucinogenic drugs. Short-term amphetamine administration (15 mg/kg) did not produce these behaviors and resulted in small decreases in brain serotonin and no change in 5-hydroxyindoleacetic acid. These data are discussed in the context of monoamine theories of schizophrenia.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Trulson, M E -- Jacobs, B L -- New York, N.Y. -- Science. 1979 Sep 21;205(4412):1295-7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/572992" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Behavior, Animal/drug effects ; Brain/*metabolism ; Brain Chemistry/*drug effects ; Cats ; Dextroamphetamine/*pharmacology ; Disease Models, Animal ; Female ; Humans ; Hydroxyindoleacetic Acid/metabolism ; Schizophrenia/*physiopathology ; Serotonin/*metabolism ; Time Factors
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 9
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    Visual resolution and receptive field size: examination of two kinds of cat retinal ganglion cell (1979)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1979-09-07
    Description: Intraocular recordings from brisk-sustained and brisk-transient ganglion cells in the cat's retina revealed a systematic increase in center size and decrease in spatial cut-off frequency with increasing distance from the area centralis. At any one eccentricity sizes of the centers of sustained and transient cells did not overlap, and the variation in cut-off frequency for each class was constrained to about one-half octave.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Cleland, B G -- Harding, T H -- Tulunay-Keesey, U -- New York, N.Y. -- Science. 1979 Sep 7;205(4410):1015-7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/472720" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cats ; Evoked Potentials ; Ganglia/physiology ; Retina/cytology/*physiology ; Vision, Ocular/*physiology ; *Visual Fields
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 10
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    The central origin of efferent pathways in the carotid sinus nerve of the cat (1979)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1979-09-07
    Description: The application of horseradish peroxidase to the central cut end of the carotid sinus nerve of the cat produced retrograde labeling of neurons in the ipsilateral medulla in the region of the nucleus ambiguus at anterior-posterior coordinates -8 to -10.5. These data coupled with previous electrophysiological observations suggest that the nucleus ambiguus may be the origin of an efferent inhibitory pathway to the carotid body.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉deGroat, W C -- Nadelhaft, I -- Morgan, C -- Schauble, T -- New York, N.Y. -- Science. 1979 Sep 7;205(4410):1017-8.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/472721" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Carotid Sinus/cytology/*innervation ; Cats ; Efferent Pathways/cytology ; Glossopharyngeal Nerve/cytology ; Horseradish Peroxidase ; Medulla Oblongata/cytology ; Neural Inhibition
    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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