Asymmetric Distributions
Mostrando 13-24 de 30 artigos, teses e dissertações.
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13. AGRUPAMENTO E VISUALIZAÇÃO DE DADOS SÍSMICOS ATRAVÉS DE QUANTIZAÇÃO VETORIAL / CLUSTERING AND VISUALIZATION OF SEISMIC DATA USING VECTOR QUANTIZATION
This thesis suggests the use of a new method of seismic data clustering that can aid in the visualization of seismic maps. Seismic data are primarily made of signal and noise and, due to its dual composition, have asymmetric distributions. Seismic data are traditionally classified by methods that lead the proposed groups` references to their mean values. The
Publicado em: 2004
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14. Sthocastic model for estimating potential maize productivity in Piracicaba-SP, Brazil. / Modelo estocástico para estimação de produtividade potencial de milho em Piracicaba - SP.
With the purpose of proposing a stochastic model for estimating potential maize productivity in Piracicaba (SP), as function of mean values of daily air temperature and solar radiation, a software was developed using Visual Basic for Windows, where it was applied for different agro climatic periods (sowing dates). The results allowed the following conclusion
Publicado em: 2004
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15. Experience-dependent, asymmetric expansion of hippocampal place fields
Theories of sequence learning based on temporally asymmetric, Hebbian long-term potentiation predict that during route learning the spatial firing distributions of hippocampal neurons should enlarge in a direction opposite to the animal’s movement. On a route AB, increased synaptic drive from cells representing A would cause cells representing B to fire ea
The National Academy of Sciences of the USA.
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16. Asymmetric Distribution of Myosin IIB in Migrating Endothelial Cells Is Regulated by a rho-dependent Kinase and Contributes to Tail Retraction
All vertebrates contain two nonmuscle myosin II heavy chains, A and B, which differ in tissue expression and subcellular distributions. To understand how these distinct distributions are controlled and what role they play in cell migration, myosin IIA and IIB were examined during wound healing by bovine aortic endothelial cells. Immunofluorescence showed tha
The American Society for Cell Biology.
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17. Transverse Distribution of Phospholipids in Organelle Membranes from Ricinus communis L. var. Hale Endosperm: MITOCHONDRIA AND GLYOXYSOMES 1
Phospholipase A2 (Naja naja), the nonpenetrating dye trinitrobenzene sulfonate, and the penetrating dye dinitrofluorobenzene, were used to determine the transmembrane distributions of phospholipids of mitochondria and glyoxysomes isolated from endosperm tissue of castor bean (Ricinus communis L. var. Hale). These studies indicated that the phospholipid distr
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18. Lighting up mRNA localization in Drosophila oogenesis
The asymmetric localization of four maternal mRNAs - gurken, bicoid, oskar and nanos - in the Drosophila oocyte is essential for the development of the embryonic body axes. Fluorescent imaging methods are now being used to visualize these mRNAs in living tissue, allowing dynamic analysis of their behaviors throughout the process of localization. This re
Company of Biologists.
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19. Membrane phospholipid asymmetry in Bacillus amyloliquefaciens.
The phospholipid distribution in the membrane of Bacillus amyloliquefaciens was studied by using phospholipase C (B. cereus), phospholipase A2 (Crotalus), and the nonpenetrating chemical probe trinitrobenzenesulfonic acid. After treatment of intact protoplasts of B. amyloliquefaciens with either phospholipase, about 70% of total membrane phospholipid was hyd
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20. Distribution of Saccharide Residues on Membrane Fragments from a Myeloma-Cell Homogenate: Its Implications for Membrane Biogenesis
Ferritin conjugates of two plant agglutinins, concanavalin A and ricin, have been used as specific electron microscopic stains for covalently-bound saccharide residues on membrane fragments from a myeloma-cell homogenate. The results indicate that different saccharide residues are uniformly localized to a single surface of each membrane fragment. In particul
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21. Electrophoretic distributions of human peripheral blood mononuclear white cells from normal subjects and from patients with acute lymphocytic leukemia.
The electrophoretic mobilities of mononuclear white cells from the peripheral blood of normal subjects and leukemic patients were measured. Analysis of both fresh and cryopreserved samples of each type showed that cryopreservation had no distinguishable effect on the electrophoretic distribution of either normal or leukemic cells. Mode mobilities (mobilities
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22. The sequence asymmetry of the Escherichia coli chromosome appears to be independent of strand or function and may be evolutionarily conserved.
I have examined potential determinants of the asymmetric distribution of nucleotide sequences in the genome of Escherichia coli as cataloged in GenBank release 44. I have used the frequency of occurrence of all possible tetranucleotides in a given sequence catalog or derivative as a comparative measure of asymmetry. The GenBank-cataloged strand and its compl
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23. Population dynamics, demographic stochasticity, and the evolution of cooperation
A basic evolutionary problem posed by the Iterated Prisoner’s Dilemma game is to understand when the paradigmatic cooperative strategy Tit-for-Tat can invade a population of pure defectors. Deterministically, this is impossible. We consider the role of demographic stochasticity by embedding the Iterated Prisoner’s Dilemma into a population dynamic framew
The National Academy of Sciences of the USA.
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24. Distributions of molecular forms of acetylcholinesterase and butyrylcholinesterase in nervous tissue of the cat.
We analyzed the activities of acetylcholinesterase and butyrylcholinesterase, and of the metabolic enzymes enolase and lactate dehydrogenase, in the superior cervical ganglion, ciliary ganglion, dorsal root ganglion, stellate ganglion, and caudate nucleus of the cat; we found that these tissues possess very different levels of enzymic activities. The proport