Pseudomonas cepacia G4 grown in chemostats with phenol demonstrated constant specific degradation rates for both phenol and trichloroethylene (TCE) over a range of dilution rates. Washout of cells from chemostats was evident at a dilution rate of 0.2 h-1 at 28 degrees C. Increased phenol concentrations in the nutrient feed led to increased biomass production with constant specific degradation r...

We applied 15N labeling approaches to leaves of the Arabidopsis thaliana rosette to characterize their protein degradation rate and understand its determinants. The progressive labeling of new peptides with 15N and measuring the decrease in the abundance of >60,000 existing peptides over time allowed us to define the degradation rate of 1228 proteins in vivo. We show that Arabidopsis protein ha...

Acetylcholine receptor located at the neuromuscular synapse of normal innervated adult muscle fibers is extremely stable metabolically. We have studied the kinetics of receptor degradation in both normal innervated and denervated rat diaphragms in organ culture. These studies show that degradation of receptor-bound 125I-alpha-bungarotoxin is a valid measure of junctional receptor degradation. D...

the degradation of poly (vinyl pyrrolidone) (pvp) by means of ultrasound irradiation and itscombination with heterogenous photocatalysis (tio2 nanoparticles) was investigated. emphasiswas given on the effect of additive on degradation rate constants. 24 khz of ultrasoundirradiation was provided by a sonicator, while an ultraviolet source of 30 w was used for uvirradiation. to increase the effic...

Untreated effluents especially in discharges from textiles and fabric industries, usually contain dyes. Synthetic dyes have adverse effects on all forms of life when discharged directly into the environment. This paper investigates photo-degradation a mixture direct orange 39, chlorantine fast red 5B, Viscose Black B sky blue K, present real textile effluent based influence ZnO photocatalyst do...

Perfluorinated chemicals such as perfluorooctane sulfonate (PFOS) and perfluorooctanoic acid (PFOA) are environmentally persistent and recalcitrant to most conventional chemical and microbial treatment technologies. In this paper, we show that sonolysis is able to decompose PFOS and PFOA present in groundwater beneath a landfill. However, the pseudo first-order rate constant for the sonochemica...

OBJECTIVE To investigate the biodegradation of tetrachloroethylene (PCE) using methanol as electron donor by acclimated anaerobic sludge. METHODS HP-6890 gas chromatograph (GC), together with HP-7694 autosampler, was used to analyze the concentration of PCE and intermediates. RESULTS PCE could be decholrinated reductively to DCE via TCE, and probably further to VC and ethylene. The degradat...

Amino acids and peptides present in waste water may produce byproducts which are potentially unsafe and may lead to serious health and environmental problems. Removal of these parent compounds by the use of the environmentally benign oxidant can be of much use to the human kind and the environment. Degradation of these peptides can be done by the Oxidation of amino acid residues which is consid...