even purified enzyme preparations are often heterogeneous. for example, preparations of aspartate aminotransferase or cytochrome oxidase can consist of several different forms of the enzyme.  for this reason we consider how different the kinetics of the reactions catalysed by a mixture of forms of an enzyme must be to provide some indication of the characteristics of the species present.  based...

in the present investigation, shells of pistachio are used as adsorbents and they have been successfully used for the removal of blue 56, from water samples. the effect of various parameters such as: ph, amounts of adsorbents, size of adsorbent particles and contact time on removal processing were investigated. in this study freundlich absorption isotherms and langmuir were investigated . the e...

background: patellofemoral pain syndrome (pfps) is one of the most frequent causes of anterior knee pain in adolescents and adults. this disorder can have a big effect on patients’ ability and quality of life and gait.   methods: this review included all articles published during 1990 to 2016. an extensive literature search was performed in databases of science direct, google scholar, pubmed an...

the kinetics of mn(vii) oxidation of lysine in moderately sulfuric acid solutions was studiedspectrophotometrically in the presence and absence of mn(ii) as catalyst. the reaction was arrangedto be under pseudo first-order condition with respect to mn(vii). the results showed that the pseudofirst-order rate constant increases with increasing [h2so4], [(mn)ii], and [lysine]. the dependence ofthe...

In this paper, experimental data on the drying kinetics of corn in a packed and fluidized bed are presented. Experimental research was conducted on a laboratory apparatus. Corn was used as a material because of its significance in agriculture and the food industry. An analysis of the influence of the operational parameters (the drying medium velocity i. e. the flu...

photoreactor using solar radiation. The effect of various parameters such as pH, initial concentration of pollutant, catalyst dose, oxidant, and time variation were studied. The determination of the best catalyst was studied amongst the four catalysts (TiO2, ZnO, PSA and SSA) .The kinetics of degradation of isooctane was also studied. The results showed that TiO2 was the best catalyst with a de...

Beginning this month and appearing periodically in future columns, "Trends in Psychopharmacology" will cover a new concept and hot topic in the field, namely, that of "multifunctional drugs." The concept is presented in overview here. Future installments will cover specific drugs in greater depth. Multifunctional drugs include those agents with more than one putative therapeutic mechanism of ac...

We outline our perspective on stochastic chemical kinetics, paying particular attention to numerical simulation algorithms. We first focus on dilute, well-mixed systems, whose description using ordinary differential equations has served as the basis for traditional chemical kinetics for the past 150 years. For such systems, we review the physical and mathematical rationale for a discrete-stocha...

We present a new microfluidic platform for the study of enzymtatic reactions using static droplets on demand. This allows us to monitor both fast and slow reactions with the same device and minute amounts of reagents. The droplets are produced and displaced using confinement gradients, which allows the experiments to be performed without having any mean flow of the external phase. Our device is...