P Delta Method
Mostrando 13-24 de 63 artigos, teses e dissertações.
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13. A numerical study of the Kullback-Leibler distance in functional magnetic resonance imaging
The Kullback-Leibler distance (or relative entropy) is applied in the analysis of functional magnetic resonance (fMRI) data series. Our study is designed for event-related (ER) experiments, where a brief stimulus is presented and a long period of rest is followed. In particular, this relative entropy is used as a measure of the "distance" between the probabi
Brazilian Journal of Physics. Publicado em: 2008-03
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14. Expression of homeobox genes in oral squamous cell carcinoma cell lines, stimulated with EGF and TGF-beta / Expressão de genes homeobox em células de carcinoma epidermóide de boca estimuladas com EGF e TGF-beta
Homeobox genes, vital to many aspects related with cellular growth and differentiation, had been described as deregulated in some cancers. Their role in carcinogenesis, mainly oral squamous cell carcinomas, remains unclear and poorly characterized. Thus, this study had the purpose to evaluate, in cell cultures, the expression profile of six homeobox genes (A
Publicado em: 2008
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15. Comparison of systolic and pulse pressure variation during pressure and volume controlled ventilation. Experimental study in rabbits / Comparação da variação da pressão sistólica e de pulso nas ventilações com pressão e volume controlados: estudo experimental em coelhos
Rationale: Systolic pressure variation (SPV) and pulse pressure variation (PPV) indices have been proposed as effective methods of hemodynamic monitoring to predict fluid responsiveness during mechanical ventilation. SPV is calculated by the difference between the maximum and minimum values of systolic blood pressure following a single positive pressure brea
Publicado em: 2006
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16. Utilização de RMN de ¹H na determinação da configuração absoluta de álcoois
This review reports the determination of absolute configuration of primary and secondary alcohols by ¹H NMR spectroscopy, using the Mosher method. This method consists in the derivatization of an alcohol possessig unknown absolute configuration with one or both enantiomers of an auxiliary reagent. The resulting diastereoisomer spectra are registered and com
Química Nova. Publicado em: 2005-12
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17. Parâmetros termodinâmicos da reação de adsorção de boro em solos tropicais altamente intemperizados
The driving force of boron adsorption on some tropical soils was evaluated by means of thermodynamic parameters. The batch method was employed, and the reaction was monitored at different pH values. The Langmuir equation successfully fitted the experimental results and provided reasonable isotherm parameters. Boron adsorption increased as a function of the p
Química Nova. Publicado em: 2005-12
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18. A semi-automatic computerized method to measure baroreflex-mediated heart rate responses that reduces interobserver variability
Arterial baroreflex sensitivity estimated by pharmacological impulse stimuli depends on intrinsic signal variability and usually a subjective choice of blood pressure (BP) and heart rate (HR) values. We propose a semi-automatic method to estimate cardiovascular reflex sensitivity to bolus infusions of phenylephrine and nitroprusside. Beat-to-beat BP and HR t
Brazilian Journal of Medical and Biological Research. Publicado em: 2005-06
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19. Standardization of the PCR technique for the detection of delta toxin in Staphylococcus spp.
Coagulase-negative staphylococci (CNS), components of the normal flora of neonates, have emerged as important opportunistic pathogens of nosocomial infections that occur in neonatal intensive care units. Some authors have reported the ability of some CNS strains, particularly Staphylococcus epidermidis, to produce a toxin similar to S. aureus delta toxin. Th
Journal of Venomous Animals and Toxins including Tropical Diseases. Publicado em: 2005-06
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20. An improved method for transformation of lettuce by Agrobacterium tumefaciens with a gene that confers freezing resistance
Um método eficiente de obtenção de cultivares de alface por meio de transformação com Agrobacterium tumefaciens foi descrito por Torres et al., 1993. Neste trabalho foi desenvolvido um procedimento melhorado a partir do trabalho descrito acima foi aplicado para transformação da cultivar de alface Grand Rapids com o gene mutado P5CS. As principais modi
Brazilian Archives of Biology and Technology. Publicado em: 2001-06
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21. Ecologia aplicada de pectinophora gossypiella (Saunders, 1843) : lepidoptera, gelechiidae
In the present work the populational fluctuation of P. gossypiella was studied in different fields and seasons under different control conditions. Also, pheromonic baits and traps as well as sexual circadian activity were evaluated. Utilizing delta traps, a cyclic behavior was detected during our observations. In fields treated conventionally in February, Ma
Publicado em: 1986
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22. Purification and characterization of the bacteriophage P4 delta protein.
The bacteriophage P4 delta protein is a transcriptional activator of the late genes of P4 as well as the late genes of its helpers, such as bacteriophage P2. delta was purified, using a variation of the MalE fusion system. With this method we purified two forms of delta: a fusion of MalE and delta and a unfused form. The fusion by itself is not active in viv
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23. Isolation and characterization of delta ompB strains of Escherichia coli by a general method based on gene fusions.
We isolated a series of delta ompR delta envZ mutants by inducing a strain carrying a lambda prophage in the closely linked gene malP and screening the bacterial survivors for loss of the major outer membrane porins OmpF and OmpC. Characterization of these deletion strains showed that both OmpR and EnvZ were necessary for transcription of ompF and ompC and t
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24. Properties of two different Na+/H+ antiport systems in alkaliphilic Bacillus sp. strain C-125.
Na+/H+ antiport was studied in alkaliphilic Bacillus sp. strain C-125, its alkali-sensitive mutant 38154, and a transformant (pALK2) with recovered alkaliphily. The transformed was able to maintain an intracellular pH (pHin) that was lower than that of external milieu and contained an electrogenic Na+/H+ antiporter driven only by delta psi (membrane potentia