Wednesday, February 26, 2014
7:00 pm - 8:00 pm - Northridge Center, University Student Union
THIS EVENT HAS BEEN POSTPONED UNTIL FURTHER NOTICE.
The Education on the Edge speaker series presents Dr. Linda Darling-Hammond.
Professor of Education at Stanford University, current Chair of the CA Commission on Teacher Credentialing, and one of the nation's Top 10 most influential people affecting educational policy.
Saturday, March 15, 2014
10:00 am - 12:00 pm - USU, Lakeview Terrace, Room D
Do you have questions about working with students with autism? Do you feel like you spend more time managing behaviors than you do actual speech therapy? Come join us for a lively discussion about practical ideas in working with students with autism hosted by the CSUN Communication Disorders and Sciences Alumni Association.
A light breakfast will be provided.
Wednesday, March 26, 2014
3:00 pm - 4:00 pm - Live Oak Hall (LO) 1231
Krishna L. Foster
Sigma Xi Distinguished Lecturer
Professor, Department of Chemistry and Biochemistry
California State University, Los Angeles
Elucidating the role of aged particulate matter on air quality
March 26, 2014, 3 pm
Dr. Foster was awarded a B.S. in chemistry from Spelman College in 1992 and a Ph.D. in physical chemistry from the University of Colorado at Boulder in 1998. Her dissertation investigates the interaction of surrogate polar stratospheric clouds with hydrogen halides, and was prepared under the direction of Drs. Margaret A. Tolbert and Steve M. George. Her postdoctoral research examined the contribution of sea-salt particles to the oxidizing capacity of the lower-atmosphere. This work was conducted at the University of California, Irvine in the laboratory of Dr. Barbara Finlayson-Pitts. She joined the faculty of California State University, Los Angeles (CSULA) in 2000 as an Assistant Professor, was promoted with tenure to Associate in 2006, and became a Full Professor in 2011. Her current research focuses on elucidating the role of aged particulate matter on air quality.
The role of aging particulate matter on air quality is an active area of research. Urban particulate matter contains polycyclic aromatic hydrocarbons (PAH) produced in incomplete combustion processes, such as the combustion of diesel fuel. Polycyclic aromatic hydrocarbons are hydrocarbons that contain 2 or more fused benzene rings. Because many PAH have demonstrated carcinogenic and mutenogenic properties, the abundance and chemical transformations of PAH have been have been studies for decades in various media including soil, water and air. Photooxidation of PAH on aged particulate matter produces oxygenated-PAH (oxy-PAH), including isomeric pyrene-diones and benzo[a]pyrene-diones (BaP-diones). Little is known about the impact of oxy-PAH on air quality. This paper will investigate the role of oxy-PAH on the oxidation capacity of the lower atmosphere through the production of singlet molecular oxygen. Singlet molecular oxygen reacts readily with organic pollutants in solutions forming peroxides that decompose to form hydroxyl radicals. Preliminary results show two isomers of benzo[a]pyrene-dione generate singlet molecular oxygen very efficiently with a quantum yield near one. Moreover, the BaP-diones quench singlet molecular oxygen at a modest rate, illustrating that these compounds are not efficient singlet oxygen quenchers. These results suggest that the photodegradation of BaP-diones are catalytic sources of singlet molecular oxygen in the lower atmosphere. The environmental implications of these findings will be discussed.