نتایج جستجو برای: electron donors
تعداد نتایج: 344426 فیلتر نتایج به سال:
For the natural donor of photosynthetic photosystem II an operational model is postulated. This model combines a definite structural pattern of two types of electron donors (octahedral arrange ment of 6 secondary donors around a primary donor) with conformational state dependent electron transfer probability. It is shown that the model provides an explanation of many experimental data, especia...
For the natural donor of photosynthetic photosystem II an operational model is postulated. This model combines a definite structural pattern of two types of electron donors (octahedral arrange ment of 6 secondary donors around a primary donor) with conformational state dependent electron transfer probability. It is shown that the model provides an explanation of many experimental data, especia...
The near-field photoluminescence of a gated two-dimensional electron gas is measured. We use the negatively charged exciton, formed by binding of an electron to a photo-excited electron-hole pair, as an indicator for the local presence of charge. Large spatial fluctuations in the luminescence intensity of the negatively charged exciton are observed. These fluctuations are shown to be due to ele...
The near-field photoluminescence of a gated two-dimensional electron gas is measured. We use the negatively charged exciton, formed by binding of an electron to a photo-excited electron-hole pair, as an indicator for the local presence of charge. Large spatial fluctuations in the luminescence intensity of the negatively charged exciton are observed. These fluctuations are shown to be due to ele...
In recent times, metal-free chemistry has received significant attention due to its inherent qualities and its potential savings in the costs of (i) reagents and (ii) environmental treatments of residues. In this context, recently developed neutral organic electron-donors have shown an ability to perform challenging reductions that are traditionally the preserve of reactive metals and metal-bas...
Archaeoglobus fulgidus neelaredoxin (Nlr) is an electron donor:superoxide oxidoreductase. The reaction of superoxide with reduced Nlr is almost diffusion-limited, but the overall efficiency for detoxifying superoxide in vivo depends on the rate of reduction of Nlr by electron donors. Here, we report the purification and characterization of the two type I rubredoxins from A. fulgidus (AF0880 and...
Using UV-visible spectrophotometric data of (1:1), electron donor-acceptor complexes (AD1, AD2 and AD3) have been investigated. The complexes concerned are n-butyl amine (D1) and cyclohexyl amine (D2) and phenyl hydrazine (D3) as electron donors with iron (III) ion as an electron acceptor (A) in methanol at 25°C. The values of formation constant (kAD), molar extinction coefficient (eAD), and ab...
Spinach chloroplast preparations were mixed with Clostridium kluyveri hydrogenase and ferredoxin. Hydrogen evolution could be measured in the light in the absence of any added electron donors. Inhibition of the water-splitting reaction or of photosystem II reduced the amount of H(2) evolved more than 95%, indicating that H(2)O was the electron donor in this reaction. The rates of H(2) evolution...
Diverse microbial communities and numerous energy-yielding activities occur in deeply buried sediments of the eastern Pacific Ocean. Distributions of metabolic activities often deviate from the standard model. Rates of activities, cell concentrations, and populations of cultured bacteria vary consistently from one subseafloor environment to another. Net rates of major activities principally rel...
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