Abstract This study focuses on the variation in activity-controlling factors during CO catalytic ignition over a CuO–CeO2 catalyst. The activity for combustion follows decreasing order of > CuO CeO2. Except inactive CeO2, increasing temperature induces to achieve self-sustained and CuO–CeO2. However, provides enough copper sites adsorb CO, abundant active lattice oxygen, thus obtaining higher h...

A quantitative (multistep) excitation-deactivation model of rose bengal (RB) has been developed which includes energy and electron transfer to oxygen and the possibility of photoproduct formation via higher excited triplet-singlet states. The model is based on previous measurements of non-linear absorption (NLA) and emission of RB with picosecond pulses at 532 nm and on NLA measurements with na...

A robust controller combining a feedforward compensator (for the measured disturbance) and a feedback RST controller is designed for the control of S. cerevisiae cultures. The controller is based on the linearization of Sonnleitner’s model allowing a simple transfer function model to be derived, which describes the relation between the ethanol concentration, the substrate feed and a measurable ...

Since their introduction in 2001 miniaturized bioreactor systems have made great advances in function and performance. In this article the dissolved oxygen (DO) transfer performance of submilliliter microbioreactors, and 1-10 mL minibioreactors was examined. Microbioreactors have reached k(L) a values of 460 h(-1) , and are offering instrumentation and some functionality comparable to productio...

Peroxynitrite mediates the oxidation of the thiol group of both cysteine and glutathione. This process is associated with oxygen consumption. At acidic pH and a cysteine/peroxynitrite molar ratio of < or = 1.2, there was a single fast phase of oxygen consumption, which increased with increasing concentrations of both cysteine and oxygen. At higher molar ratios the profile of oxygen consumption ...

Apo-glucose oxidase has been reconstituted with flavins modified in the 7 and 8 positions and characterized with regard to the catalytic rate of O(2) reduction and oxygen-18 isotope effects on this process. Kinetic studies as a function of driving force indicate a reorganization energy for electron transfer to O(2) of lambda = 28 kcal mol(-)(1) at optimal pH, which is similar to the value obtai...

Short-term oxygen consumption and filtration rate experiments were conducted to evaluate the response of edible cockle Cerastoderma edule when infested by the Digenean trematod Labratrema minimus. In this experiment the metabolic activities of bivalves were measured to detennine this particular aspect of the host-parasite interaction. We have used the Bucephalidae digenea Labratrema minimus inf...

A generalized kinetic model for fly ash native carbon oxidation is developed. It is shown that the conversion of fly ash native carbon to CO2 is the result of two simultaneous processes taking place on fly ash surface: the first process (rate constant k2) is the direct oxygen transfer from a metal oxide site to a vacant carbon active site leading to immediate carbon gasification; the second one...

th th Abstract: Snails Lymnaea accuminata, were exposed to 1.4 mg/l (1/10 of 96 hrLC50) and 2.8 mg/l(1/5 of 96hr LC50) of insecticide Dichlorvos. Initially at 24 hours, at both the concentrations Increase in respiratory rate is noted. At 48 hours stage, increase in respiratory rate is noticed at both the sublethal concentrations. At 72 hours stage in both the sublethal concentrations reduction ...

The oxygen barrier properties of composite materials, consisting of a 45 μm thick LDPE substrate coated by a thin layer (0.7-1 μm) of nanostructured hybrid organic/inorganic materials based on SiO2 and polyethylene-polyethylene glycol (PE-PEG) block copolymers, obtained via a sol-gel technique have been characterized at 35°C and 50°C. A significant decrease (25-40%) of the oxygen transfer rate ...