6911 Weiss Dr.,

Galveston, TX, 77551

(409)-740-4530 (Lab)

(409)-354-8312 (Cell)

xuchen66@tamu.edu

Chen Xu

Areas of Study

 

-        Chemical Oceanography

-        Environmental Chemistry

-        Environmental Microbiology and Radiochemistry

Education

 

09/2000-08/2004: Xiamen University, Xiamen, Fujian, Peoples Republic of China; Bachelor of Science in Environmental Science and Engineering

Thesis Topic in B. Sc.: Nutrient distribution and fluxes in the South China Sea

 

 

09/2004-12/2007: Texas A&M University, Galveston, Texas, USA; Master of Science, majoring in Oceanography

Thesis Title: Optimized procedures for extraction, purification and characterization of exopolymeric substances (EPS) from two bacteria (Sagittula Stellata and Pseudomonas fluorescens Biovar II) with relevance to the study of actinide binding in aquatic environments

01/2008- present: Texas A&M University, Galveston, Texas, USA; Enrolled in Ph.D program, majoring in Oceanography

Experience

 

07/2003-05/2004: Xiamen University, Xiamen, Fujian, Peoples Republic of China. _Lingfeng Undergraduate Research Award Projects_ in the Department of Environmental Sciences and Engineering (Dr. Minhan Dai and Dr. Pinghe Cai, Co-advisors)

 

 

04/2005: R/V Gyre cruise, led by Dr. William R. Bryant under the project of TEES# DGOMB, Deep Gulf of Mexico Benthics, (Geological Support) MMS

 

 

05/2005: R/V Gyre cruise, led by Dr. William R. Bryant under the project of TEES# DGOMB, Deep Gulf of Mexico Benthics, (Geological Support) MMS

 

 

08/2005: R/V Pelican cruise. Funding Project: NSF-OCE, _Collaborative Proposal: Th(IV) and Pa(IV,V) binding to exopolymeric acid polysaccharides in marine environments_, P.H. Santschi, lead-PI, 2004-2008.

 

 

05/2006: R/V Seaward Johnson. Funding Project: NSF-OCE, _Collaborative Proposal: Th(IV) and Pa(IV,V) binding to exopolymeric acid polysaccharides in marine environments_, P.H. Santschi, lead-PI, 2004-2008.

 

 

09/2005-present: Texas A& M University at Galveston, Galveston, Texas, USA; Research Assistant in Dr. Peter H. Santschi?_s Lab in Department of Oceanography (Dr. Peter H. Santschi, Supervisor)

 

 

01/2007-05/2007: Texas A& M University at Galveston, Galveston, Texas, USA; Teaching Assistant in Department of Marine Sciences (Dr. Susan Knock, Supervisor)

 

 

01/2008-05/2008: Texas A&M University at Galveston, Galveston, Texas, USA; Teaching Assistant in Department of Marine Sciences

(Dr. Susan Knock, Supervisor)

 

 

01/2008: College of Science, Old Dominion University, Virginia, USA; Visiting student in the usage of Bruker Avance II 400 MHz NMR-spectrometer and interpretation of NMR COSY, TOCSY, DPMAS, HSQC spectra

(Dr. Patrick G. Hatcher and Dr. Zhong, Junyan, Co-advisors)

Training

 

-        Basic laboratory procedure

-        Microbe cultures and phytoplankton cultures

-        Ultrafiltration technique

-        Use of liquid scintillation counter

-        Use of beta-counter

-        Use of gamma-counter

-        Use of GC-EI-MS

-        Use of ATR-FT/IR

-        Use of PerkinElmer CHNO/S Analyzer

-        Use of Shimadzu TOC 5000 Analyzer

-        Use of Waters HPLC

-        Gel electrophoresis

Award

 

-        Welch Foundation Fellowship (Grant BD-0046; Spring, 2009)

-        Erma Lee and Luke Mooney Graduate Student Excellence Research Award (2008)

Publications

 

 

Xu, C., Santschi, P.H., Schwher, K., Hung, C.-C., 2009. Optimized isolation procedure for obtaining strongly actinide binding exopolymeric substances (EPS) from two bacteria (Sagittula stellata and Pseudomonas fluorescens Biovar II). Bioresource Technology. 100,6010-6021

Miao, A., Schwehr, K.A., Xu, C., Zhang, S., Luo, Z., Quigg, A., Santschi, P.H., 2009. The toxicity of silver engineered nanoparticles to a marine diatom, and potential detoxification by exopolymeric substances. Environ. Pollution. In press.

Guo, L. D., White, D.M., Xu, C., Santschi, P.H., 2009. Chemical and isotopic composition of colloidal organic matter from the Mississippi River plume. Marine Chemistry. 114, 63-71.

Roberts, K.A., Xu, C., Hung, C.-C., Conte, M.H., Santschi, P.H., 2009. Scavenging and fractionation of thorium vs. protactinium in the ocean, as determined from particle-water partitioning experiments with sediment trap material from the Gulf of Mexico and Sargasso Sea. Earth and Planetary Science Letters. In press.

Hung, C.-C., Xu, C., Santschi, P.H., Zhang, S., Schwehr, K.A.,?_ Quigg, A., Pinckney, J., Long, R., Guo, L., Gong, G.-C., and Wei, C.-L. 2009. Evaluation of the POC and 234Th fluxes in the Gulf of Mexico from sediment traps and size-fractionated POC/234Th ratios in suspended particles. Mar. Chem. In revision.

Xu, C., Santschi, P. H., Zhong, J. Y., Hatcher, P. G., Francis, A. J., Dodge, C. J., Roberts, K. A., Hung, C. C. and B. D. Honeyman., 2008. Colloidal Cutin-Like Substances Cross-Linked to Siderophore Decomposition Products Mobilizing Plutonium from Contaminated Soils. Environmental Science & Technology, 42(22): 8211-8217.

Zhang, S., Xu, C., Santschi, P.H., 2008. Chemical composition and 234Th (__) binding of extracellular polymeric substances (EPS) produced by the marine diatom Amphora sp. Marine Chemistry. 112, 81-92.

Other activities

 

-        Reviewer for Mar. Chem.

Abstracts

 

Hung, C.-C., Xu, C., Schwehr, K.A., Roberts, K., Santschi, P.H., Cai, Y., Guo, L., Tsai, J., Wei, C., 2006. ASLO. Re-examination of POC/Th-234 ratios in size-fractionated particles. Ocean Science Meeting. Honolulu, Hawaii, USA.

Schwehr, K.A., Truxal, L., Hung, C.-C., Xu, C., Santschi, P.H., 2007. Importance of relative hydrophobicity and molecular weight distributions of selected exopolymeric substances for their physico-chemical properties. ASLO. Aquatic Science Meeting, Sante Fe, New Mexico, USA.

Hung, C.-C., Schwehr, K.A., Xu, C., Roberts, K.A., Santschi, P.H., 2007. Enigma of Assessing losses from filtration of POC and associated species such as Th-234 in the ocean. ASLO. Aquatic Science Meeting, Sante Fe, New Mexico, USA

Xu, C., Santschi, P.H., 2008. Studies on the isolation and characterization of exopolymeric substances from marine substances from marine bacterium Sagittula stellata and soil bacterium Pseudomonas fluorescens Biovar II. ASLO. Ocean Science Meeting. Orlando, Florida, USA.

Schwehr, K.A., Miao, A-J., Xu, C., Zhang S-J, Santschi, P.H. 2008. In search of an elusive scale for the relative hydrophobicity of exopolymeric gel-forming substances. 2008 ASLO Aquatic Sciences Meeting, Orlando, Florida, Mar. 2-7, 2008. Paper 018-3141.

Miao, A. Quigg, A., Schwehr, K., Xu, C., Santschi, P., 2008. Potential effects of exopolymeric substances on engineered silver nanoparticles?_ (ESSNS) bioavailability and toxicity to a coastal marine phytoplankton. 2008 ASLO Aquatic Sciences Meeting, Orlando, Florida, Mar. 2-7, 2008. Paper 018-835.

Mobilization of plutonium by organic matter decomposition products and microbial metabolites. Xu, C., Santschi, P.H., Zhong, J.Y., Hatcher, P.G., Francis, A.J., Dodge, C.J., Roberts, K.A., Hung, C.-C., Honeyman, B.D. 2009 Migrations. 12th International Conference on the Chemistry and Migration Behaviour of Actinides and Fission Products in the Geosphere. September 20 - 25, 2009. PB4-14.