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Evaluation of layered and mixed passive treatment systems for acid mine drainage
Jeen, Sung-Wook,Mattson, Bruce Informa UK (TaylorFrancis) 2016 Environmental Technology Vol.37 No.22
<P>Laboratory column tests for passive treatment systems for mine drainage from a waste rock storage area were conducted to evaluate suitable reactive mixture, system configuration, effects of influent water chemistry, and required residence time. Five columns containing straw, chicken manure, mushroom compost, and limestone (LS), in either layered or mixed configurations, were set up to simulate the treatment system. The results showed that all of the five columns removed metals of concern (i.e. Al, Cd, Co, Cu, Fe, Ni, and Zn) with a residence time of 15h and greater. Reaction mechanisms responsible for the removal of metals may include sulfate reduction and subsequent sulfide precipitation, precipitation of secondary carbonates and hydroxides, co-precipitation, and sorption on organic substrates and secondary precipitates. The results suggest that the mixed systems containing organic materials and LS perform better than the layered systems, sequentially treated by organic and LS layers, due to the enhanced pH adjustment, which is beneficial to bacterial activity and precipitation of secondary minerals. The column tests provide a basis for the design of a field-scale passive treatment system, such as a reducing and alkalinity producing system or a permeable reactive barrier.</P>
Nitric oxide suppresses L-type calcium currents in basilar artery smooth muscle cells in rabbits
Sharma, Naveen,Bhattarai, Janardhan Prasad,Hwang, Pyoung Han,Han, Seong Kyu Informa UK (TaylorFrancis) 2013 Neurological research Vol.35 No.4
<P>Nitric oxide (NO) is well known to be a vasodilator, and NO donor compounds are currently used for treating vasospasm following subarachnoid hemorrhage. However, the action mechanism of cerebral vascular relaxation is not yet clear. L-type calcium channels have been determined to play an essential role in smooth muscle contraction. To investigate the role of L-type calcium channels in NO-induced relaxation of basilar smooth muscle cells, we examined the effect of the NO donor, sodium nitroprusside (SNP) on calcium (Ca2+) currents using smooth muscle cells isolated from a rabbit basilar artery.</P>
Park, Hyun-Jung,Shim, Hyun Soo,Kim, Kyung Soo,Han, Jeong-Jun,Kim, Jin Su,Ram Yu, A.,Shim, Insop Informa UK (TaylorFrancis) 2013 Nutritional neuroscience Vol.16 No.2
<P>Phosphatidylserine, a major acidic phospholipid in the brain, has been studied extensively in regard to its actions on brain functions. The present study examined the effects of Krill phosphatidylserine (Krill-PS) on the learning and memory function and the neural activity in the normal young rats.</P>