Brownian Movement
Mostrando 1-12 de 17 artigos, teses e dissertações.
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1. Target Search for Transcription Factors on DNA Chains
RESUMO Entre muitas estruturas presentes nas células dos seres vivos, existem proteínas chamadas fatores de transcrição (FT) que são responsáveis por inibir ou promover a transcrição do ADN. Para realizar sua função, os fatores de transcrição executam buscas aleatórias ao redor do citoplasma (para células procarióticas) e ao longo da cadeia de
TEMA (São Carlos). Publicado em: 16/09/2019
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2. Direct block scheduling under marketing uncertainties
Abstract Mineral projects are composed of geological, operational and market uncertainties, and reducing these uncertainties is one of the objectives of engineering. Most surveys assess the impact of geological and operational uncertainties on the mining planning. The objective of this work is to study the impact of market uncertainty on the mineral activity
REM, Int. Eng. J.. Publicado em: 2018-04
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3. Nanobacteria-like particles : a threat to cell cultures
The main goal of this study is to alert researchers who work with cell cultures for the risk of contamination by structures called nanobacteria (NB). NB are tiny structures with size varying from 80 to 500 nm, commonly occurring in clusters and producing a biofilm which contains carbonate or hydroxyl apatite. The most likely source of cell culture contaminat
Publicado em: 2010
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4. Movimento bidirecional no transporte intracelular mediado por motores moleculares / Bidirectional movement in the intracellular transport mediated by molecular motors
In this work we present a theoretical model to describe aspects of the bidirectional movement performed by intracellular structures (vesicles, organelles, viruses etc, to which we refer here simply as "vesicles"), observed essentially at in vivo experiments. This nondifusive movement is characterized by rapid inversions in direction and is capable of creatin
Publicado em: 2007
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5. Um estudo na teoria do movimento brownianno com viscosidade variável
Neste trabalho nós investigamos o comportamento estocástico de uma grande classe de sistemas com amortecimento variável descritos por uma lagraniana dependente do tempo. Nossa abordagem estocástica é baseada no formalismo de Langevin descrevendo o comportamento de uma partícula browniana clássica de massa m. Duas situações de interesse físico são
Publicado em: 2003
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6. Intestinal Coccidia (Apicomplexa: Eimeriidae) of Brazilian Lizards. Eimeria carmelinoi n.sp., from Kentropyx calcarata and Acroeimeria paraensis n.sp. from Cnemidophorus lemniscatus lemniscatus (Lacertilia: Teiidae)
Eimeria carmelinoi n.sp., is described in the teiid lizard Kentropyx calcarata Spix, 1825 from north Brazil. Oocysts subspherical to spherical, averaging 21.25 x 20.15 µm. Oocyst wall smooth, colourless and devoid of striae or micropyle. No polar body or conspicuous oocystic residuum, but frequently a small number of fine granules in Brownian movement. Spor
Memórias do Instituto Oswaldo Cruz. Publicado em: 2002-03
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7. A dinamica caotica como mecanismo de dissipação - o papel das orbitas periodicas : fisica geral, teoria
We study classically a system with three degrees of freedom, composed of two subsystems weakly coupled. The first, a chaotic system with two freedoms, works as a reservoir for the second, the system of interest. The effects of the chaotic dynamics on the system of interest renders the motion of the latter similar to the Brownian movement, which is dissipativ
Publicado em: 1996
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8. Estudo das relaxações de polimeros utilizando sondas luminescentes
Some relaxations of organic polymers were studied using luminescence probes dispersed in the polymers. We have studied the following polymers: poly(styrene), poly(vinyl acetate), poly(propylene), low density poly(ethylene) and poly(ethylene glycol)-600. Anthracene and benzophenone were dispersed in these polymers to analyse the temperature dependence on both
Publicado em: 1988
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9. Mechanism of the single-headed processivity: Diffusional anchoring between the K-loop of kinesin and the C terminus of tubulin
A motor-domain construct of KIF1A, a single-headed kinesin superfamily protein, was demonstrated to take more than 600 steps before detaching from a microtubule. However, its molecular mechanism remained unclear. Here we demonstrate the nucleotide-dependent binding between the lysine-rich, highly positively charged loop 12 of the KIF1A motor domain (K-loop)
The National Academy of Sciences.
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10. Fluctuation in the microtubule sliding movement driven by kinesin in vitro.
We studied the fluctuation in the translational sliding movement of microtubules driven by kinesin in a motility assay in vitro. By calculating the mean-square displacement deviation from the average as a function of time, we obtained motional diffusion coefficients for microtubules and analyzed the dependence of the coefficients on microtubule length. Our a
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11. Tethered particle motion method for studying transcript elongation by a single RNA polymerase molecule.
Schafer et al. (Nature 352:444-448 (1991)) devised the tethered particle motion (TPM) method to detect directly the movement of single, isolated molecules of a processive nucleic acid polymerase along a template DNA molecule. In TPM studies, the polymerase molecule is immobilized on a glass surface, and a particle (e.g., a 0.23 microns diameter polystyrene b
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12. Change of the higher order structure of DNA induced by the complexation with intercalating synthetic polymer, as is visualized by fluorescence microscopy.
The electrophoretic movement and Brownian motion of T4DNA, lambda DNA and their complexes with polyacrylamide (PAAm) via intercalative unit from 5-[(4-acryloylamino)phenyl]-3-amino-7-(dimethylamino)-2-methylp henazinium chloride were observed using fluorescence microscopy. It was found that T4DNA/PAAm complex migrates slower than T4DNA alone in gel electroph