A5087618795- Groundwater flow and contamination studies
- Water Quality and Resources Studies
- Groundwater and Isotope Geochemistry
- Fecal contamination and water quality
- Listeria monocytogenes in Food Safety
- Wastewater Treatment and Reuse
- Nuclear and radioactivity studies
- Landfill Environmental Impact Studies
- Water Quality Monitoring and Analysis
- Water Quality Monitoring Technologies
- Salmonella and Campylobacter epidemiology
- Geophysical Methods and Applications
- Parasitic Infections and Diagnostics
- Pharmaceutical and Antibiotic Environmental Impacts
- Vibrio bacteria research studies
- Chemical Safety and Risk Management
- Urban Stormwater Management Solutions
- Electrokinetic Soil Remediation Techniques
- Animal Nutrition and Physiology
- Recycled Aggregate Concrete Performance
- Child Nutrition and Water Access
- Wnt/β-catenin signaling in development and cancer
- Growth and nutrition in plants
- Irrigation Practices and Water Management
- Knowledge Management and Technology
University of California, Davis
2015-2020
Institute for Food Safety and Health
2015-2020
South Dakota State University
2010
Savannah River National Laboratory
1999-2001
Surveys of microbiological groundwater quality were conducted in a region with intensive animal agriculture California, USA. The survey included monitoring and domestic wells eight concentrated feeding operations (CAFOs) 200 small (domestic community supply district) across the region. Campylobacter was not detected groundwater, whereas Escherichia coli O157:H7 Salmonella each 2 190 CAFO well samples. Nonpathogenic generic E. Enterococcus spp. 24.2% (46/190) 97.4% (185/190) samples from 4.2%...
This randomized controlled trial characterized the transfer of E. coli from animal feces and/or furrow water onto adjacent heads lettuce during foliar irrigation, and subsequent survival bacteria on adaxial surface leaves. Two experiments were conducted in Salinas Valley, California: (1) to quantify indicator chicken rabbit fecal deposits placed furrows surrounding raised beds, (2) inoculated Romaine over 10 days. was recovered 97% (174/180) a maximal distance 162.56 cm (5.33 ft) feces....
In 2011, the US Congress passed Food Safety Modernization Act, which tasks and Drug Administration to establish microbiological standards for agricultural water. However, little data are available quality of surface water irrigation supplies. During 2015 season, we conducted a baseline study on microbial large districts in California ( n = 2) Washington 4). Monthly samples 517) were analyzed bacterial indicators (fecal coliforms, enterococci, Escherichia coli ) pathogens Salmonella spp., E....
Abstract The study was conducted to investigate the efficacy of a probiotic Bacillus subtilis strain on growth performance, diarrhea, systemic immunity, and intestinal health weaned pigs experimentally infected with an enterotoxigenic Escherichia coli compare B. that carbadox. Weaned (n = 48, 6.17 ± 0.36 kg body weight [BW]) were individually housed in disease containment rooms randomly allotted one four dietary treatments: negative control (NC, diet without E. challenge), positive (PC,...
In this study cull dairy cows from six California herds were sampled seasonally over the course of a year. The objectives to determine prevalence antimicrobial resistant (AMR) Salmonella spp. shed in cow feces, and factors associated with fecal shedding AMR multidrug (MDR) Salmonella.Six farms located San Joaquin Valley identified enrolled as convenience sample. On each dairy, once during four seasons, 10 randomly selected for sampling on day their removal herd. addition, personnel completed...
ABSTRACT Escherichia coli serotype O157:H7 is a zoonotic food- and waterborne bacterial pathogen that causes high hospitalization rate can cause life-threatening complications. Increasingly, E. infections appear to originate from fresh produce. Ruminants, such as cattle, are prominent reservoir of in the United States. California one most agriculturally productive regions world for produce, beef, milk. The close proximity produce cattle presents food safety challenges on uniquely large...
Agricultural recovery basins are an important conservation practice designed to provide temporary storage of sediment and water on farms before low-volume discharge. However, food safety concerns have been raised regarding redistribution captured fields used for human production. The purpose this study was examine the potential microbiological risk that may contribute nearby produce evaluate characteristics influence or mitigate those risks. Water samples were collected from participating in...
Field trials were conducted in July-August and October 2012 to quantify the inactivation rate of Escherichia coli O157:H7 when mixed with fecal slurry applied romaine lettuce leaves. Lettuce was grown under commercial conditions Salinas Valley, California. One-half milliliter rabbit, chicken, or pig slurry, containing an average 4.05 × 107 CFU E. (C0), inoculated onto upper (adaxial) surface a lower leaf on 288 heads per trial immediately following 2.5 h irrigation event. To estimate...
This study quantified the association of rodent fruit damage and microbiological quality irrigation water on risk contamination strawberries collected from 18 U-pick farms across five different districts in Guangzhou metropolitan region southern China. Fifty-four composite samples, with or without evidence avian foraging (i.e., bitten), along 16 were during spring 2014 winter 2015 our cohort farms. Composite strawberry samples analyzed for total coliforms, E. coli, Salmonella, coli O157,...
Abstract The use of rodent models to evaluate efficacy during testing is accompanied by significant economic and regulatory hurdles which compound the costs screening for promising drug candidates. Vasopermeation Enhancement Agents (VEAs) are a new class biologics that designed increase uptake cancer therapeutics at tumor site modifying vascular permeability in therapeutic index co-administered drugs. To panel VEA clinical candidates, we compared Miles assay an equivalent ex ovo chicken...
ProGlucan is 100% dried algae, Euglena gracillus, which contains approximately 54% β-1,3-glucan. The objective of this experiment was to investigate the influence dietary supplementation on growth performance, diarrhea score, and gut permeability weaned pigs experimentally infected with a pathogenic F-18 Escherichia coli. Weaned (n = 36; 7.69 ± 0.77 kg BW) were individually housed in disease containment rooms randomly allotted 1 3 treatments 12 replicate each treatment. diets nursery basal...
Wnt signaling plays a central role in the development of bone forming osteoblasts and remodeling. This study analyzed Wnt‐10b control gene expression throughout osteoblast differentiation. Genes regulated by were identified analyzing five mouse lines (C3H10T1/2, ST‐2, marrow stromal cells, MC‐3T3, calvarial osteoblasts). These cell exposed to media from producing line via transwell system. mRNA levels 32 osteoblastic, BMP responsive genes quantified qPCR. Several consistently up/down...