Secondary Electrons
Mostrando 1-11 de 11 artigos, teses e dissertações.
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1. In vitro and in vivo electrochemical studies of nickel-chromium-molybdenum-titanium alloy applied to oral implant suprastructures / Estudos eletroquímicos in vitro e in vivo da liga níquelcromomolibdênio titânio aplicada em supraestruturas de implantes orais
The electrochemical behavior of the nickel-chromium-molybdenum-titanium (Ni-Cr-Mo-Ti) alloy was studied and compared to a gold-platinum-palladium (Au-Pt-Pd) alloy in 0.15 mol.L -1 NaCl medium at 36.5ºC. In vitro studies also involved the electrochemical titanium characterization since these alloys are employed in osseointegrated implant suprastructures. In
Publicado em: 2005
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2. Two dimensional computer simulation of plasma immersion ion implantation
The biggest advantage of plasma immersion ion implantation (PIII) is the capability of treating objects with irregular geometry without complex manipulation of the target holder. The effectiveness of this approach relies on the uniformity of the incident ion dose. Unfortunately, perfect dose uniformity is usually difficult to achieve when treating samples of
Brazilian Journal of Physics. Publicado em: 2004-12
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3. Longitudinal magnetic field effect on the electrical breakdown in low pressure gases
The electrical breakdown has been investigated for low-pressure argon and nitrogen discharges under the influence of an external longitudinal magnetic field. Plane-parallel aluminum electrodes (5 cm diameter) separated by a variable distance d (4.0 cm < d < 11.0 cm) were sustained with a dc voltage (0 < V < 1 kV). A Helmholtz coil was used to produce an unif
Brazilian Journal of Physics. Publicado em: 2004-12
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4. Novo arranjo para determinar os coeficientes de emissão e a distribuição de energia dos elétrons secundários emitidos por sólidos / A new arragement determine the coefficients of the emission and the secondary electrons distribution emitted by solids
Neste trabalho estudou-se um novo arranjo de medida para se obter a distribuição de energia dos elétrons secundários emitidos e os coeficientes de emissão por um sólido. Pelo fato deste arranjo permitir a medida direta do potencial de superfície no caso dos polímeros e da ddp de contato no caso dos metais, foi possível aplicar e descrever teoricamen
Publicado em: 1996
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5. Mode of inhibition of electron transport by orthophenanthroline in chromatophores and reaction centers of Rhodopseudomonas sphaeroides
In Rhodopseudomonas sphaeroides, light causes the transfer of electrons from bacteriochlorophyll to ubiquinone in the photochemical reaction centers. Electrons from this “primary” ubiquinone move on to a secondary ubiquinone. We have studied the manner in which o-phenanthroline inhibits the transfer of electrons from primary to secondary ubiquinone in ch
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6. The Involvement of Hydrogen Peroxide in the Differentiation of Secondary Walls in Cotton Fibers1
H2O2 is a widespread molecule in many biological systems. It is created enzymatically in living cells during various oxidation reactions and by leakage of electrons from the electron transport chains. Depending on the concentration H2O2 can induce cell protective responses, programmed cell death, or necrosis. Here we provide evidence that H2O2 may func
American Society of Plant Physiologists.
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7. Energetics of syntrophic cooperation in methanogenic degradation.
Fatty acids and alcohols are key intermediates in the methanogenic degradation of organic matter, e.g., in anaerobic sewage sludge digestors or freshwater lake sediments. They are produced by classical fermenting bacteria for disposal of electrons derived in simultaneous substrate oxidations. Methanogenic bacteria can degrade primarily only one-carbon compou
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8. Determination of the Rate Limiting Step for Photosynthesis in a Nearly Isonuclear Rapeseed (Brassica napus L.) Biotype Resistant to Atrazine
Plant biotypes that are resistant to S-triazines under most conditions often grow less vigorously and have lower quantum yields and lower maximum rates of photosynthesis. The photosynthetic reactions responsible for these effects were identified in whole leaves and thylakoids of nearly isonuclear lines of oilseed rape (Brassica napus L.). The lower quantum y
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9. Genome Mining in Sorangium cellulosum So ce56: IDENTIFICATION AND CHARACTERIZATION OF THE HOMOLOGOUS ELECTRON TRANSFER PROTEINS OF A MYXOBACTERIAL CYTOCHROME P450*
Myxobacteria, especially members of the genus Sorangium, are known for their biotechnological potential as producers of pharmaceutically valuable secondary metabolites. The biosynthesis of several of those myxobacterial compounds includes cytochrome P450 activity. Although class I cytochrome P450 enzymes occur wide-spread in bacteria and rely on ferredoxins
American Society for Biochemistry and Molecular Biology.
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10. Availability of specific reductases controls the temporal activity of the cytochrome P450 complement of Streptomyces coelicolor A3(2)
The annotated genome of Streptomyces coelicolor A3(2) revealed 18 cytosolic cytochromes P450 (CYPs) with six ferredoxin (fdx) proteins and two soluble ferredoxin reductases (fpr), their putative electron transport proteins. mRNA expression was observed for all 18 CYPs throughout growth and secondary metabolism, from 3 h after spore germination, and all CYP p
National Academy of Sciences.
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11. Herbicide resistance in Chlamydomonas reinhardtii results from a mutation in the chloroplast gene for the 32-kilodalton protein of photosystem II
We report the isolation and characterization of a uniparental mutant of Chlamydomonas reinhardtii that is resistant to 3-(3,4-dichlorophenyl)-1,1-dimethylurea (DCMU) and 2-chloro-4-ethylamino-6-isopropylamino-s-triazine (atrazine). Such herbicides inhibit photosynthesis by preventing transfer of electrons in photosystem II from the primary stable electron ac