Herein, we report a facile and flexible synthesis of porous highly faceted platinum nanoparticles (NPs) performed in the liquid phase. The is by reduction 2,4-pentantedionate presence oleylamine oleic acid dibenzyl ether at 200 °C. growth process was monitored time-course transmission electron microscopy (TEM), revealing peculiar progressive evolution that, comparison with previous methodologie...

The contribution of hydrogen peroxide (H2O2) and one of its unstable intermediates, superoxide anion (O2), to the oxidative reactions that occur in phagocytizing leukocytes was explored by depleting these cells of O2. This was accomplished by allowing them to phagocytize latex particles coated with superoxide dismutase (SOD), which catalyzes the generation of H2O2 from O2. Although the rate and...

A chemical and magnetic characterization of ferromagnet/antiferromagnet interfaces is essential to understand the microscopic origins of exchange anisotropy and other magnetic phenomena. We have used highresolution L-edge x-ray absorption spectroscopy ~XAS!, which is element specific and sensitive to chemical environment and spin orientation, to investigate the interface of antiferromagnetic ox...

Rate constants for reduction of cytochrome bsel by internal ascorbate (kOA) and oxidation by external ferricyanide (klF) were determined as a function of pH from rates of steady-state electron transfer across chromaffin-vesicle membranes. The pH dependence of electron transfer from cytochrome b56l to ferricyanide (klF) may be attributed to the pH dependence of the membrane surface potential. Th...

Several observations stimulate interest in the quantitative aspects of energy expenditure in the reduction of pyridine nucleotide and the oxidation of cytochrome. First, a comparison of energy conserved in electron transfer with that expended in its reversal gives a measure of the efficiency of the process: the full energy of the oxidation-reduction reaction must be expended in activating the r...

Although normal fatty acids (FAs) are degraded via β-oxidation, unusual FAs such as 2-hydroxy (2-OH) FAs and 3-methyl-branched FAs are degraded via α-oxidation. Phytosphingosine (PHS) is one of the long-chain bases (the sphingolipid components) and exists in specific tissues, including the epidermis and small intestine in mammals. In the degradation pathway, PHS is converted to 2-OH palmitic ac...

The two-electron ubiquinol oxidation or ubiquinone reduction typically involves semiquinone (SQ) intermediates. Natural engineering of ubiquinone binding sites of bioenergetic enzymes secures that SQ is sufficiently stabilized, so that it does not leave the site to membranous environment before full oxidation/reduction is completed. The ubiquinol oxidation Qo site of cytochrome bc1 (mitochondri...

Triggering the redox reaction of oxygens has become essential for the development of (electro) catalytic properties of transition metal oxides, especially for perovskite materials that have been envisaged for a variety of applications such as the oxygen evolution or reduction reactions (OER and ORR, respectively), CO or hydrocarbons oxidation, NO reduction and others. While the formation of lig...

Under secondary metabolic conditions, the white-rot basidiomycete Phanerochaete chrysosporium degraded 2,7-dichlorodibenzo-p-dioxin (I). The pathway for the degradation of I was elucidated by the characterization of fungal metabolites and oxidation products generated by lignin peroxidase (LiP), manganese peroxidase (MnP), and crude intracellular cell-free extracts. The multistep pathway involve...

Platinum’s (Pt) poisoning effect on Cu-SSZ-13 and its regeneration were investigated. The Pt enhanced the parallel reactions, such as NH3 oxidation NO which decreased deNOx activities. In temperature range below 330 °C, deactivation of by was primarily caused overconsumption NH3, due to NH3-selective reaction, while formation NOx in into NO2 further aggravated degradation when above 460 °C. non...