Sliding Contact
Mostrando 25-34 de 34 artigos, teses e dissertações.
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25. Modelamento do desgaste por deslizamento em anéis de pistão de motores de combustão interna. / Modelling of the sliding wear on piston rings of internal combustion engines.
The wear of piston rings and cylinder liner was modelled through a computer code that calculates the hydrodynamic and roughness contact pressures acting in the contact surfaces. The predicted wear is compared with a 750 hours dynamometer test of a medium duty diesel engine
Publicado em: 2000
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26. Estudo da influencia de parametros de processamento na resistencia ao desgaste do polietileno de ultra alto peso molecular
The Ultra High Molecular Weight Polyethylene (UHMWPE) is the most used human artificial joint polymer. In spite of its very good wear resistance properties the lifetime of the prosthetic system is limited by its wear. In order to study how the variation of the processing conditions influences the wear resistance of the plastic, a polymer molding and a wear t
Publicado em: 1997
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27. Structure-based predictions of Rad1, Rad9, Hus1 and Rad17 participation in sliding clamp and clamp-loading complexes
The repair of damaged DNA is coupled to the completion of DNA replication by several cell cycle checkpoint proteins, including, for example, in fission yeast Rad1Sp, Hus1Sp, Rad9Sp and Rad17Sp. We have found that these four proteins are conserved with protein sequences throughout eukaryotic evolution. Using computational techniques, including fold recognitio
Oxford University Press.
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28. A critical epitope for substrate recognition by the nucleosome remodeling ATPase ISWI
The ATPase ISWI is the catalytic core of several nucleosome remodeling complexes, which are able to alter histone–DNA interactions within nucleosomes such that the sliding of histone octamers on DNA is facilitated. Dynamic nucleosome repositioning may be involved in the assembly of chromatin with regularly spaced nucleosomes and accessible regulatory seque
Oxford University Press.
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29. Creating a dynamic picture of the sliding clamp during T4 DNA polymerase holoenzyme assembly by using fluorescence resonance energy transfer
The coordinated assembly of the DNA polymerase (gp43), the sliding clamp (gp45), and the clamp loader (gp44/62) to form the bacteriophage T4 DNA polymerase holoenzyme is a multistep process. A partially opened toroid-shaped gp45 is loaded around DNA by gp44/62 in an ATP-dependent manner. Gp43 binds to this complex to generate the holoenzyme in which gp45 act
The National Academy of Sciences.
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30. Simultaneous recordings of force and sliding movement between a myosin-coated glass microneedle and actin cables in vitro.
To elucidate the molecular mechanism of muscle contraction resulting from the ATP-dependent actin-myosin interaction, we constructed an assay system with which both the force and the movement produced by the actin-myosin interaction in vitro can be simultaneously recorded and analyzed. The assay system consisted of the giant internodal cells of an alga, Nite
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31. Topography of the ISW2–nucleosome complex: insights into nucleosome spacing and chromatin remodeling
Linker DNA was found to be critical for the specific docking of ISW2 with nucleosomes as shown by mapping the physical contacts of ISW2 with nucleosomes at base-pair resolution. Hydroxyl radical footprinting revealed that ISW2 not only extensively interacts with the linker DNA, but also approaches the nucleosome from the side perpendicular to the axis of the
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32. Glia-independent chains of neuroblasts through the subcortical parenchyma of the adult rabbit brain
In the brains of adult mammals long-distance cell migration of neuronal precursors is known to occur in the rostral migratory stream, involving chains of cells sliding into astrocytic glial tubes. By combining immunocytochemistry for polysialylated neural cell adhesion molecule (PSA-NCAM), neuronal and glial antigens, endogenous and exogenously administered
National Academy of Sciences.
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33. A case for sliding SeqA tracts at anchored replication forks during Escherichia coli chromosome replication and segregation
SeqA is an Escherichia coli DNA-binding protein that acts at replication origins and controls DNA replication. However, binding is not exclusive to origins. Many fragments containing two or more hemi-methylated GATC sequences bind efficiently. Binding was optimal when two such sequences were closely apposed or up to 31 bases apart on the same face of the DN
Oxford University Press.
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34. Protein and ligand dynamics in 4-hydroxybenzoate hydroxylase
para-Hydroxybenzoate hydroxylase catalyzes a two-step reaction that demands precise control of solvent access to the catalytic site. The first step of the reaction, reduction of flavin by NADPH, requires access to solvent. The second step, oxygenation of reduced flavin to a flavin C4a-hydroperoxide that transfers the hydroxyl group to the substrate, requires
The National Academy of Sciences.