Riverbank filtration (RBF) is an important part of the surface water–groundwater cycle, and it intercepts retains many pollutants in rivers. However, RBF affects biogeochemical process which enables aquifer sediments to release iron (Fe) manganese (Mn). In this study, column experiments were performed investigate effects ammonium ions organic matter on Fe Mn from anaerobic sediments. addition, ...

Microbial communities can play important role in arsenic release in groundwater aquifers. To investigate the microbial communities in high arsenic groundwater aquifers in agricultural irrigation area, 17 groundwater samples with different arsenic concentrations were collected along the agricultural drainage channels of Hangjinhouqi County, Inner Mongolia and examined by illumina MiSeq sequencin...

the influence of various polymers on the release rate of lithium carbonate from matrix-type tablets was investigated in an attempt to formulate a sustained release solid dosage form. for this purpose, tablets containing 450 mg of lithium carbonate along with various amounts of carbopol 934p, 971p, 974p, pemulen and eudragit rlpo as retarding agents and inactive ingredients (e.g. pvp, avicel or ...

the objective of the study was to compare pharmacokinetic and pharmacodynamic parameters of gliclazide after administration of immediate (ir) and modified release (mr) tablets. the experiment included rats with both normoglyceamia and streptozocin (stz)-induced hyperglyceamia. several mr formulations were designed and in vitro drug release profile was assessed by a dissolution test. for the fur...

frequent dosing of the potent anti-androgen, flutamide, is necessary to reach a therapeutic level for the treatment of prostatic carcinoma. sustained delivery of the drug could reduce the adverse effects such as gastrointestinal disorders and improve patient compliance. in the present study sustained-release matrix tablets of flutamide were prepared by direct compression method using different ...

T he surfaces of microbial cells are perhaps their most important structure because they are in immediate contact with the external environment. Microbial cell walls admit nutrients and release wastes, and yet they must resist internal turgor pressure and environmental insults and maintain cellular shape. Walls also help cells adhere to other surfaces and provide space for specialized structure...

We carried out a simulation experiment in a laboratory in order to study the effects of hydrostatic pressure from 0.1 MPa to 1.0 MPa on nitrogen cycles at the water-sediment interface of a freshwater reservoir. The results show that high hydrostatic pressure facilitates the release of nitrogen at the interface and ammonification, but has little influence on denitrification. And high hydrostatic...

The purpose of the research presented herein was to evaluate the effects of solids residence time (SRT) and organic acid augmentation on biological phosphorus removal (BPR), with a focus on how these operational variables affect key metabolisms and the distribution of the microbial population. Using laboratory-scale sequencing batch reactors seeded with a mixed microbial consortium and fed real...