Picard Number
Mostrando 1-8 de 8 artigos, teses e dissertações.
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1. Dinamica não linear e controle de sistemas ideais e não-ideais periodicos
Neste trabalho, apresenta-se um novo método numérico para aproximar matriz de transição de estados (STM) para sistemas com coeficientes periódicos no tempo. Este método, é baseado na expansão polinomial de Chebyshev, no método iterativo de Picard e na transformação de Lyapunov-Floquet (L-F) e aplica-se na análise da dinâmica e o controle de sist
Publicado em: 2005
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2. Threefolds whose canonical bundles are not numerically effective
Let X be an arbitrary nonsingular projective 3-fold whose canonical bundle is not numerically effective. Then we have: (i) X contains an exceptional divisor of several types, which we classify explicitly, (ii) X has a morphism to a projective nonsingular surface whose fibers are conics, (iii) X has a morphism to a projective nonsingular curve whose general f
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3. A rapid and efficient one-tube PCR-based mutagenesis technique using Pfu DNA polymerase.
A rapid method for efficiently generating site-directed mutations on a clean sequence background is described. This modification of the megaprimer PCR mutagenesis approach can be performed in one tube in less than 4.5 hours, and does not require purification of intermediate products. High fidelity of DNA sequence replication is obtained by employing Pfu DNA
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4. Existence of nonarithmetic monodromy groups
In an 1885 paper, E. Picard defined a subgroup Τ(Λ) of PU(2,1) generated by monodromies and depending on parameters Λ = (λ1,λ2,λ3,λ4), 0 < λi < 1, < λi < 3, λi + λj ≥ 1, 1 ≤ i < j ≤ 4. The family Τ(Λ) resembles the family of groups Τ([unk]) defined in 1978 but is a different family. In common with the groups Τ([unk]), (i) Τ(Λ) is discr
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5. Mutator Natural Escherichia coli Isolates Have an Unusual Virulence Phenotype
A small percentage of natural Escherichia coli isolates (both commensal and pathogenic) have a mutator phenotype related to defects in methyl-directed mismatch repair (MR) genes. We investigated whether there was a direct link between the mutator phenotype and virulence by (i) studying the relationships between mutation rate and virulence in a mouse model of
American Society for Microbiology.
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6. Model of interaction between a cardiotoxin and dimyristoylphosphatidic acid bilayers determined by solid-state 31P NMR spectroscopy.
The interaction of cardiotoxin IIa, a small basic protein extracted from Naja mossambica mossambica venom, with dimyristoylphosphatidic acid (DMPA) membranes has been investigated by solid-state 31P nuclear magnetic resonance spectroscopy. Both the spectral lineshapes and transverse relaxation time values have been measured as a function of temperature for d
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7. An intronic 10-base-pair deletion in a class II A beta gene affects RNA processing.
Several biologically important examples of posttranscriptionally regulated genes have recently been described (T. Gerster, D. Picard, and W. Schaffner, Cell 45:45-52, 1986; R. Reeves, T.S. Elton, M.S. Nissen, D. Lehn, and K.R. Johnson, Proc. Natl. Acad. Sci. USA 84:6531-6535, 1987; H.A. Young, L. Varesio, and P. Hwu, Mol. Cell. Biol. 6:2253-2256, 1986). Litt
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8. Detection and enumeration of bacteria in soil by direct DNA extraction and polymerase chain reaction.
In order to develop a rapid and specific detection test for bacteria in soil, we improved a method based on the polymerase chain reaction (PCR). Each step of the protocol, including direct lysis of cells, DNA purification, and PCR amplification, was optimized. To increase the efficiency of lysis, a step particularly critical for some microorganisms which res