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Full-Text Articles in Biomedical Engineering and Bioengineering

Bactericidal Effects Of Cold Plasma Technology On Geobacillus Stearothermophilus And Bacillus Cereus Microorganisms, Angela D. Morris, Gayle B. Mccombs, Susan L. Tolle, Mounir Laroussi, Wayne L. Hynes Oct 2007

Bactericidal Effects Of Cold Plasma Technology On Geobacillus Stearothermophilus And Bacillus Cereus Microorganisms, Angela D. Morris, Gayle B. Mccombs, Susan L. Tolle, Mounir Laroussi, Wayne L. Hynes

Dental Hygiene Faculty Publications

Cold plasma is a state of matter that contains a large number of particles that are electrically charged. Plasmas generate chemically reactive species and ultraviolet radiation making them useful in decontamination applications (Kong & Laroussi, 2003). Research regarding the inactivation of gram-positive bacteria by cold plasma has been studied by Laroussi et al (2003); however, there is limited research regarding the germicidal effectiveness of cold plasma on Geobacillus stearothermophilus and Bacillus cereus microorganisms. The purpose of this study was to determine if cold plasma technology inactivates Geobacillus stearothermophilus and Bacillus cereus vegetative cells and spores. This study consisted of 981 samples; 762 experimental samples exposed to cold plasma at various times and 291 controls. Experimental samples were inoculated and exposed either ...


Potentiality Of Biogas And The Role Of Substrates In Biogas Formation Potential, Scott Shealy Apr 2007

Potentiality Of Biogas And The Role Of Substrates In Biogas Formation Potential, Scott Shealy

Independent Study Project (ISP) Collection

Biogas infrastructure development, particularly in countries such as Vietnam, has the potential to provide great benefits to people living agrarian lifestyles in rural areas. Decentralized wastewater treatment facilities that utilize anaerobic technologies to digest organic waste for the purpose of collecting methane provide a number of benefits to centralized use as well. In both cases, users benefit from the production of methane gas, wastewater treatment, nutrient recycling, and organic fertilizers. In the case of decentralized use, as is most prevalent in Vietnam, integrated farming methods, such as the VACB model, allow farmers to reap the benefits of a wide array ...


Electron Microscopic Observations Of Interfacial Voids In Aluminum Created By Alkaline Dissolution, Saikat Adhikari, L. Scott Chumbley, H. Chen, Y. C. Jean, A. C. Geiculescu, Kurt R. Hebert Jan 2007

Electron Microscopic Observations Of Interfacial Voids In Aluminum Created By Alkaline Dissolution, Saikat Adhikari, L. Scott Chumbley, H. Chen, Y. C. Jean, A. C. Geiculescu, Kurt R. Hebert

Chemical and Biological Engineering Conference Presentations and Proceedings

We report evidence from electron microscopy and positron annihilation spectroscopy (PAS) for the formation by alkaline dissolution of nm-scale voids in aluminum near the metal-oxide interface. Imaging was carried out using transmission electron microscopy (TEM), scanning transmission electron microscopy (STEM) and field emission scanning electron microscopy (FESEM). EM images supported the PAS finding that voids were found within tens of nm of the interface, and revealed that the void number density increased by at least 10 times due to dissolution. From TEM, void number densities were on the order of 108 cm-2. From TEM and SEM, voids appeared circular in ...


Theoretical Study Of The Pyrolysis Of Methyltrichlorosilane In The Gas Phase. 2. Reaction Paths And Transition States, Yingbin Ge, Mark S. Gordon, Francine Battaglia, Rodney O. Fox Jan 2007

Theoretical Study Of The Pyrolysis Of Methyltrichlorosilane In The Gas Phase. 2. Reaction Paths And Transition States, Yingbin Ge, Mark S. Gordon, Francine Battaglia, Rodney O. Fox

Chemical and Biological Engineering Publications

The kinetics for the previously proposed 114-reaction mechanism for the chemical vapor deposition (CVD) process that leads from methyltrichlorosilane (MTS) to silicon carbide (SiC) are examined. Among the 114 reactions, 41 are predicted to proceed with no intervening barrier. For the remaining 73 reactions, transition states and their corresponding barrier heights have been explored using second-order perturbation theory (MP2) with the aug-cc-pVDZ basis set. Final energies for the reaction barriers were obtained using both MP2 with the aug-cc-pVTZ basis set and coupled cluster theory (CCSD(T)) with the aug-cc-pVDZ basis set. CCSD(T)/aug-cc-pVTZ energies were estimated by assuming additivity ...


Theoretical Study Of The Pyrolysis Of Methyltrichlorosilane In The Gas Phase. 1. Thermodynamics, Yingbin Ge, Mark S. Gordon, Francine Battaglia, Rodney O. Fox Jan 2007

Theoretical Study Of The Pyrolysis Of Methyltrichlorosilane In The Gas Phase. 1. Thermodynamics, Yingbin Ge, Mark S. Gordon, Francine Battaglia, Rodney O. Fox

Chemical and Biological Engineering Publications

Structures and energies of the gas-phase species produced during and after the various unimolecular decomposition reactions of methyltrichlorosilane (MTS) with the presence of H2 carrier gas were determined using second-order perturbation theory (MP2). Single point energies were obtained using singles + doubles coupled cluster theory, augmented by perturbative triples, CCSD(T). Partition functions were obtained using the harmonic oscillator-rigid rotor approximation. A 114-reaction mechanism is proposed to account for the gas-phase chemistry of MTS decompositions. Reaction enthalpies, entropies, and Gibbs free energies for these reactions were obtained at 11 temperatures ranging from 0 to 2000 K including room temperature and typical ...