Nuclear magnetic resonance spectroscopy has emerged as a valuable tool for engineers for noninvasive, real-time studies of cellular metabolism. Two applications of NMR for studying cellular metabolism were investigated in this work: 31 P NMR for studying yeast in a bioreactor and 13 C NMR for studying bioremediation. One acute challenge in NMR ...

A novel bead-pack micromodel has been developed to observe directly with videomicroscopy movement and distribution of toluene in the subsurface, including effects of water infiltration, variations in the water table, and alcohol-water flushing. If the medium was initially partially water-saturated, toluene spread downward along air-water interfaces, ...

Pliable, biodegradable scaffolds with poly(lactic-co-glycolic acid) (PLGA) and poly(ethylene glycol) (PEG) blends have been fabricated using a solvent-casting and particulate-leaching technique. This study investigated the effects of different processing parameters, PLGA copolymer ratio, the PLGA/PEG blend ratio, the initial salt weight fraction, and ...

A high pressure heat flux calorimeter in isobaric, temperature-ramping mode has been used to measure the solubility of pure methane, pure carbon dioxide and methane-carbon dioxide mixtures. The solubility measurements emphasize a crystallization-like process taking place during hydrate formation and show a striking divergence from Henry's Law, the ...

The object of the present work has been to study the adsorption of hydrocarbon vapors on various types of clays, and to learn from this adsorption study the relative importance of various factors, both chemical and physical, which determine the adsorptive phenomena. The initial work was designed to learn the relative magnitude and flexibility of ...

Monocyte adhesion to the endothelium is one of the earliest events leading to the pathogenesis of various inflammatory disorders like atherosclerosis. Since these interactions normally occur in flowing blood, it becomes essential to elucidate receptor mediated molecular mechanisms underlying monocyte-endothelial adhesion under physiologic flow ...

The properties of fluids near interfaces, in particular, the fluid-solid interfaces on which this work is concentrated, are important in many processes, such as: wettability as related to oil recovery and environmental cleanup, biochemical separation, bio-compatibility of materials, membrane separation, adsorption in porous solids and micro- or ...

Deposition of highly conformal alumina thin films onto various substrates was carried out by hydrolysis of AlH3(NMe2Et) in a hot-wall atmospheric pressure chemical vapor deposition (APCVD) system. Optimum growth conditions were at 165°C with a AlH3(NMe 2Et):H2O ratio of less than 1:25. Films were characterized by SEM, microprobe and electrical ...

There is a great need to develop new polymer foam systems that combine the advantages of polyurethane foams (low cost, ease of processing, desirable physical properties) with nonflammability and thermal stability which polyurethanes lack. In this project we address this need by synthesizing novel polymer networks with a substantial content of ...

This work further develops a technique for changing the electronic and defect structure of magnesium oxide and silica gel catalysts. Relatively small doses of ultraviolet and neutron irradiation have been found to enhance greatly the catalytic activity of MgO for the reaction H 2 + D2 &rlhar2; 2HD. The enhancement by radiation depends on the extent ...