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Events for December 01, 2006
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Department Christmas Party
Fri, Dec 01, 2006
Sonny Astani Department of Civil and Environmental Engineering
Receptions & Special Events
Audiences: Department Only
Contact: Jean-Pierre Bardet
This event is open to all eligible individuals. USC Viterbi operates all of its activities consistent with the University's Notice of Non-Discrimination. Eligibility is not determined based on race, sex, ethnicity, sexual orientation, or any other prohibited factor. -
Unraveling Bacterial Mn(II) Oxidation
Fri, Dec 01, 2006 @ 01:00 PM - 02:00 AM
Sonny Astani Department of Civil and Environmental Engineering
Conferences, Lectures, & Seminars
Speakers:Hope A. Johnson and Bradley M. TeboThe Scripps Research Institute
La Jolla, CAAbstract
It is important to understand the fundamental mechanism of bacterial manganese(II) oxidation because it plays a role in many biogeochemical cycles and can be utilized for bioremediation. Prior work with Mn(II)-oxidizing bacteria has suggested that Mn(II) oxidation involves a multicopper oxidase, but whether this enzyme directly catalyzes Mn(II) oxidation is unknown. For a clearer understanding of microbial Mn(II) oxidation, we have undertaken biochemical studies in the model marine -proteobacterium, Erythrobacter sp. strain SD21. In vitro experiments with this strain showed the Mn(II)-oxidizing activity to be protein dependent. The optimum pH for activity was 8.0 with a specific activity of 2.5 nmol/min/mg and a Km = 204 µM. The activity is soluble which may suggest a cytoplasmic or periplasmic protein. Mn(III) is an intermediate in the oxidation of Mn(II) and likely the primary product of enzymatic oxidation by this organism. The activity is stimulated by calcium, but is not stimulated by copper in vivo or in vitro. Surprisingly, the activity was enhanced by pyrroloquinoline quinone (PQQ) and NAD+. PQQ could also rescue Pseudomonas putida MnB1 non-Mn(II)-oxidizing mutants with insertions in the anthranilate synthase gene. Partially purified Mn(II) oxidase was significantly enriched in quinones and had a UV/VIS absorption spectrum similar to a known quinoprotein but not to known multicopper oxidases, suggesting that quinones may play an integral role in bacterial Mn(II) oxidation. In addition to investigating enzymes involved in Mn(II) oxidation in laboratory model strains, we have also assayed and directly identified enzymes from the environment.Location: Kaprielian Hall (KAP) - rielian Hall, Room 203
Audiences: Everyone Is Invited
Contact: Evangeline Reyes
This event is open to all eligible individuals. USC Viterbi operates all of its activities consistent with the University's Notice of Non-Discrimination. Eligibility is not determined based on race, sex, ethnicity, sexual orientation, or any other prohibited factor. -
Water in Green Manufacturing: The Next Frontier
Fri, Dec 01, 2006 @ 01:00 PM - 02:00 PM
Sonny Astani Department of Civil and Environmental Engineering
Conferences, Lectures, & Seminars
Speaker:Azita Yazdani, P.E.
President and CEO
Exergy Technologies Corporation
25 Mauchly, Suite 316, Irvine CA 92618
Phone: 949-231-1390
Fax: 949-757-2715Abstract:Water is the most important raw material in terms of quality and quantity used in many manufacturing processes. An average process bath is made of at least 80% water, followed by most process steps that use one or more water rinses. Water can solve and cause many problems in production. Manufacturing plants spend millions of dollar each year to remove impurities before the water used in their processes is acceptable for use. Additionally, water quality plays an important role in ensuring process performance and quality of product.Membrane technologies can play an important role in delivering acceptable water quality to many processes. Today, these technologies also show promise for recycle and reuse applications of both water and process chemicals. Various membrane and electro-membrane technologies can provide and maintain high quality water and chemicals for process applications. These technologies help companies reduce the cost and operational downtimes experienced by the manufacturing processes by making reuse and recycling cost effective.Location: Kaprielian Hall (KAP) - rielian Hall 156
Audiences: Everyone Is Invited
Contact: Evangeline Reyes
This event is open to all eligible individuals. USC Viterbi operates all of its activities consistent with the University's Notice of Non-Discrimination. Eligibility is not determined based on race, sex, ethnicity, sexual orientation, or any other prohibited factor.
