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  • 1
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    Adaptive changes of the vestibulo-ocular reflex in flatfish are achieved by reorganization of central nervous pathways (1983)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1983-08-19
    Description: Flatfish provide a natural model for the study of adaptive changes in the vestibulo-ocular reflex system. During metamorphosis their vestibular and oculomotor coordinate systems undergo a 90 degree relative displacement. As a result, during swimming movements different types of compensatory eye movements are produced before and after metamorphosis by the same vestibular stimulation. Intracellular staining of central nervous connections in the flatfish with horseradish peroxidase revealed that in postmetamorphic fish secondary horizontal semicircular canal neurons contact vertical eye muscle motoneuron pools on both sides of the brain via pathways that are absent in all other vertebrates studied.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Graf, W -- Baker, R -- 13742/PHS HHS/ -- New York, N.Y. -- Science. 1983 Aug 19;221(4612):777-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6603656" target="_blank"〉PubMed〈/a〉
    Keywords: Adaptation, Physiological ; Animals ; Fishes/anatomy & histology/*physiology ; Metamorphosis, Biological ; Neuronal Plasticity ; Oculomotor Muscles/*physiology ; Vestibule, Labyrinth/innervation/*physiology
    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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    Narcolepsy: biogenic amine deficits in an animal model (1983)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1983-05-06
    Description: Concentrations of biogenic amine metabolites in discrete brain areas differed significantly between dogs with genetically transmitted narcolepsy and age- and breed-matched controls. Dopamine and 3,4-dihydroxyphenylacetic acid were consistently elevated in the brains of narcoleptic animals, while homovanillic acid was not. Narcoleptic animals consistently exhibited lower utilization of dopamine and higher intraneuronal degradation of dopamine but no uniform decrease in serotonin utilization. Hence neuropathology appears to be associated with genetically transmitted canine narcolepsy. The data indicate a nonglobal depression of dopamine utilization or turnover or both.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Mefford, I N -- Baker, T L -- Boehme, R -- Foutz, A S -- Ciaranello, R D -- Barchas, J D -- Dement, W C -- MH 05804/MH/NIMH NIH HHS/ -- MH 23861/MH/NIMH NIH HHS/ -- NS 13211/NS/NINDS NIH HHS/ -- etc. -- New York, N.Y. -- Science. 1983 May 6;220(4597):629-32.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6188216" target="_blank"〉PubMed〈/a〉
    Keywords: 3,4-Dihydroxyphenylacetic Acid/analysis ; Animals ; *Brain Chemistry ; *Disease Models, Animal ; Dogs ; Dopamine/analysis ; Epinephrine/analysis ; Homovanillic Acid/analysis ; Humans ; Hydroxyindoleacetic Acid/analysis ; Narcolepsy/*physiopathology ; Norepinephrine/analysis ; Serotonin/analysis ; Sleep, REM/physiology
    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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    A gene controlling condensation of heterochromatin in Drosophila melanogaster (1983)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1983-07-01
    Description: A temperature-sensitive lethal mutant of Drosophila melanogaster was used to identify an essential cell cycle function that is necessary for the mitotic condensation of heterochromatic but not of euchromatic portions of the genome. This mutant is an allele at a locus (mus-101) identified earlier by the use of mutagen-sensitive mutants. The data suggest that the mutagen-sensitive and repair-defective phenotypes of viable mus-101 mutants result from a disruption in chromosome organization.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Gatti, M -- Smith, D A -- Baker, B S -- GM23345/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1983 Jul 1;221(4605):83-5.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6407113" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Cycle ; Chromosomes/ultrastructure ; Drosophila melanogaster ; Female ; *Genes ; Heterochromatin/*genetics/physiology ; Male ; Mutation
    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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  • 4
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    Aspects of a penalty finite element algorithm for the turbulent three-dimensional parabolic Navier-Stokes equations (1983)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: The formal derivation of the three-dimensional parabolic Navier-Stokes equations for subsonic turbulent flow is reviewed. A penalty finite element algorithm is established for numerical solution of the sixteen dependent variable system. Key numerical results are summarized documenting applications in various problem definitions.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
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  • 5
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    Finite element computational fluid mechanics (1983)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: Finite element analysis as applied to the broad spectrum of computational fluid mechanics is analyzed. The finite element solution methodology is derived, developed, and applied directly to the differential equation systems governing classes of problems in fluid mechanics. The heat conduction equation is used to reveal the essence and elegance of finite element theory, including higher order accuracy and convergence. The algorithm is extended to the pervasive nonlinearity of the Navier-Stokes equations. A specific fluid mechanics problem class is analyzed with an even mix of theory and applications, including turbulence closure and the solution of turbulent flows.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
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  • 6
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    Relationships between mineralization and silicic volcanism in the central Andes (1983)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: Existing models for the genesis of porphyry copper deposits indicate that they formed in granodioritic stocks located in the infrastructure of andesitic stratovolcanoes. It is noted that sites of porphyry-type subvolcanic tin mineralization in the Eastern Cordillera of Bolivia are distinguished by the absence of such andesitic structures. The surface expression of a typical subvolcanic porphyry tin deposit is thought to be an extrusive dome of quartz latite porphyry, sometimes related to a larger caldera structure. Evidence from the El Salvador porphyry copper deposit in the Eocene magmatic belt in Chile indicates that it too may be more closely related to a silicic volcanic structure than to an andesitic stratovolcano. The dome of La Soufriere, Guadeloupe is offered as a modern analog for the surface expression of subvolcanic mineralization processes, with the phreatic eruptions there indicating the formation of hydrothermal breccia bodies in depths. It is pointed out that the occurrence of mineralized porphyries, millions of years after caldera formation, does not necessarily indicate that tin intrusions and mineralization are not genetically related to the subcaldera pluton, but may be a consequence of the long thermal histories (1-10 million years) of the lowermost parts of large plutons.
    Keywords: GEOPHYSICS
    Type: Journal of Volcanology and Geothermal Research (ISSN 0377-0273); 18; 165-190
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  • 7
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    Progress on a generalized coordinates tensor product finite element 3DPNS algorithm for subsonic (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A generalized coordinates form of the penalty finite element algorithm for the 3-dimensional parabolic Navier-Stokes equations for turbulent subsonic flows was derived. This algorithm formulation requires only three distinct hypermatrices and is applicable using any boundary fitted coordinate transformation procedure. The tensor matrix product approximation to the Jacobian of the Newton linear algebra matrix statement was also derived. Tne Newton algorithm was restructured to replace large sparse matrix solution procedures with grid sweeping using alpha-block tridiagonal matrices, where alpha equals the number of dependent variables. Numerical experiments were conducted and the resultant data gives guidance on potentially preferred tensor product constructions for the penalty finite element 3DPNS algorithm.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-CR-172256 , NAS 1.26:172256 , COMCO-83-TR-2.1
    Format: application/pdf
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  • 8
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    An ISEE 3 high time resolution study of interplanetary parameter correlations with magnetospheric activity (1983)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: The coupling between the solar wind and the geomagnetic disturbances was examined using data from the ISEE-3 spacecraft at an earth-sun libration point and ground-based data. One minute data were used to avoid aliasing in determining the internal magnetospheric response to solar wind conditions. Attention was given to the cross-correlations between the geomagnetic index (AE), the total energy dissipation rate (UT), and the solar wind parameters, as well as the spatial and temporal scales on which the magnetosphere reacts to the solar wind conditions. It was considered necessary to characterize the physics of the solar wind-magnetosphere coupling in order to define the requirements for a spacecraft like the ISEE-3 that could be used as a real time monitoring system for predicting storms and substorms. The correlations among all but one parameter were lower during disturbance intervals; UT was highly correlated with all parameters during the disturbed times. An intrinsic 25-40 min delay was detected between interplanetary activity and magnetospheric response in quite times, diminishing to no more than 15 min during disturbed times.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 88; Aug. 1
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  • 9
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    Plasma regimes in the deep geomagnetic tail - ISEE 3 (1983)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: The spacecraft remained close to or within a previously unexplored part of the distant (60-220 earth radii) geomagnetic tail nearly continuously from January 1 to March 30, 1983. Analysis of the data reveals that all of the plasma regimes identified previously with near-earth measurements (plasma sheet, low-latitude boundary layer, plasma mantle, lobe, and magnetosheath) remain recognizable in the distant tail. These regimes, however, are found to be intermingled in a more chaotic fashion than near the earth. Within the plasma sheet at approximately 200 earth radii, typical flow velocities are about 500 km/s tailward, considerably higher than in the near-earth plasma sheet. Earthward flow within the plasma sheet is observed occasionally, indicating the temporary presence of a neutral line beyond 220 earth radii. Also found are strong bidirectional electron anisotropies throughout much of the distant plasma sheet, boundary layer, and magnetosheath.
    Keywords: GEOPHYSICS
    Type: Geophysical Research Letters (ISSN 0094-8276); 10; Sept
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  • 10
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    Introduction - Processes of continental rifting (1983)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: It is thought likely that thermal thinning and/or diapirism can cause the extensional stress required for rifting. The rifting, however, will not occur unless the regional tectonic regime permits the sides of the rift to diverge. Whereas passive plate extension could cause rifting in isolation, the extension and rifting are likely to be localized where the lithosphere is weakest over an existing thermal anomaly. In those cases where asthenospheric diapirism occurs, which is essentially a response to thinning of the lithosphere by thermal thinning or plate extension, the effects of diapirism may completely mask the initiating mechanism. It is believed that anomalous heat transfer into the lithosphere, diapirism, and magmatism must all figure in rifting, along with a deviatoric stress field that will permit extension in a developing rift. Even though the models are useful in permitting idealized processes to be quantified and tested, better knowledge of lithosphere properties is considered necessary, in particular knowledge of mantle viscosity and its temperature dependence.
    Keywords: GEOPHYSICS
    Type: Tectonophysics (ISSN 0040-1951); 94; 1983
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