Maya A. Trotz

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Goethite is a representative iron oxide in natural environments due to its abundance and thermodynamic stability and may be responsible for many surface-mediated processes, including ion retention and mobility in aqueous settings. A large variability in morphologies and specific surface areas of goethite crystals exists but little work has been done to(More)
Dissolved carbonate species are known to affect the sorption behavior of trace species. The macroscopic description of these interactions with a thermodynamic approach has been limited by the lack of data on the binary interaction between carbonate and relevant mineral surfaces. This work follows from two detailed studies of carbonate adsorption on goethite(More)
Membrane damage caused by phospholipase A action is thought to be an important factor in ischemic myocardial injury. Propranolol has been shown previously to have beneficial effects in both animal experiments and clinical trials, and it has membrane-stabilizing properties in vitro. To investigate the possibility that these effects might be due, in part, to(More)
Phospholipase A has been solubilized from the sarcoplasmic reticulum of rat heart by treatment with Tris buffer, potassium chloride, taurodeoxycholate or octyl glucoside. On HPLC gel permeation, two phospholipases were identified at the void volume of a TSK 3000 column and at an apparent molecular mass of 60 kDa. The two activity peaks exhibited a(More)
The cytosol of rat heart has been previously shown to contain phospholipase A activity in substantial amounts. This paper describes the isolation and partial purification of rat heart cytosolic phospholipase A. After homogenization of rat heart followed by centrifugation to remove membraneous material, the phospholipase A activity was isolated by ammonium(More)
Neural tube defects were induced dose-dependently by single injections of the anticonvulsant drug valproic acid (VPA) as sodium salt in mice on gestational day 8. Folinic acid (5-CHO-THF) coadministration by i.p. injection or by a constant rate infusion via osmotic minipumps, implanted s.c., significantly reduced the exencephaly rates using a randomized(More)
A Hybrid Adsorption and Biological Treatment System (HABiTS) was investigated for efficient nitrification in on-site wastewater treatment. Variable septic tank effluent loading experiments were carried out in bench-scale columns, with and without zeolite addition. Enhanced NH4-N removal (80%) was observed in the HABiTS column that combined expanded clay and(More)
The Low Carbon Development Strategy proposed in June 2009 by the government of Guyana in response to the Reducing Emissions from Deforestation and Forest Degradation in Developing Countries program has triggered evaluation of forest-related activities, thereby acting as a catalyst for improvements in Guyana's small- to medium-scale gold mining industry.(More)
Kemiron, a commercially available, porous iron oxide sorbent was evaluated in batch systems for arsenate (As(V)) and selenite (Se(IV)) removal from aqueous solutions as a function of pH, ionic strength, and particle size (< 38 micro m and between 250 and 425 micro m). BET surface area of Kemiron is 39.8 m(2)/g and Electron dispersive spectroscopy (EDS)(More)