mesoporous tio2 has been prepared using a nonionic block copolymer (pluronic p-123) as structure-directing agent with sol-gel method. characterization of the product was carried out by means of x-ray diffraction (xrd), scanning electron microscopy (sem), thermogravimetry-differential scanning calorimetry (tg-dsc), nitrogen sorption isotherms, and uv-vis absorption spectroscopy. these analyses s...

background: carbaryl (1-naphthyl-n-methyl carbamate) is a chemical in the carbamate family used chiefly as an insecticide. it is a cholinesterase inhibitor and is toxic to humans and classified as a likely human carcinogen. in the present study, the degradation of the carbaryl pesticide was investigated in the laboratory synthetic samples of tap water, in the effect of sonolysis and photolysis ...

adsorption of anilofos was studied in four soils (topsoil from alfisol, inceptisol, oxisol and vertisol). the order of adsorption of anilofos was vertisol > oxisol > alfisol > inceptisol. the soil sorption coefficient k and the soil organic carbon sorption coefficient koc are the basic parameters used for describing the environmental fate of the herbicides. in top soil the calculated k values w...

background: poly chlorinated biphenyls (pcbs) are a class of chlorinated organic chemicals that do not easily degrade in the environment. this study was conducted to determine the effect of microwave rays, hydrogen peroxide, dioxide titanium and ethanol solvent on the degradation of pcbs. methods: a 900w domestic mw oven with a fixed frequency of 2450 mhz was used to provide mw irradiation. ray...

in plants, γ-aminobutyric acid (gaba) is synthesized by polyamine degradation pathway besides gaba shunt. aminoguanidine (ag) is a specific inhibitor of the key enzyme (diamine oxidase, dao) for gaba formation in polyamine degradation pathway. in this study, ag was applied to study the functions of polyamine degradation pathway on growth and gaba accumulation in germinating fava bean under hypo...

10

General nutritional strategies to promote whole body protein retention, particularly with relation to exercise, have been largely based on adult research that does not consider the dynamic process of growth and often ignores scenarios commonly experienced by children (e.g., exercise in the heat). Therefore, the aim of the present review is to highlight the importance of post-exercise protein qu...

1. Department of Human Genetics, University of Chicago. 920 E 58th St, CLSC 317. Chicago, IL, 60637, USA 2. Present address: Department of Biology, Massachusetts Institute of Technology. 31 Ames Street, 68-271A. Cambridge, MA 02139-4307, USA 3. Present address: Department of Evolutionary Anthropology and Duke Population Research Institute, Duke University. 125 Science Drive, Durham, NC 27708, USA.

We analyse a simple kinase model that exhibits bistability when there is no protein turnover, and show analytically that the property of being bistable is not necessarily conserved when degradation and synthesis of the kinase are taken into account.