February 2008
Antibiotic resistance profile of Escherichia coli from clinically healthy pigs and their commercial farm environments
The study was conducted to determine the antibiotic resistance profile ofEscherichia coli isolated from clinically healthy pigs and their commercial farm environments. Differential and selective media were used to isolate a total of 142E. coli strains from 202 samples. These were tested against 16 antibiotics using the disc diffusion method. The isolates showed high resistance rates to Cefuroxime (89.4%),...
February 2008
Safety control indices for plaa-som, a Thai fermented fish product
This study was aimed to determine chemical and microbiological changes duringplaa-som fermentation process. The results have been considered for use as safety control indices to obtain a higher quality and safer plaa-som. The fermentation process can be divided into an initiation stage (samples 1 to 3) and a maturation stage (samples 4 to 9) based on the changes obtained. At the initiation stage, pH...
February 2008
Isolation and characterization of a chlorpyrifos-degrading bacterium from agricultural soil and its growth response
A soil bacterium capable of utilizing chlorpyrifos as sole carbon source was isolated by selective enrichment on mineral medium containing chlorpyrifos. The bacterial isolate, designated MS09, was identified and characterized as a strain ofProvidencia stuartii based on biochemical characteristics and 16S rRNA sequence analysis. Growth studies showed that P. stuartii strain MS09 utilized chlorpyrifos to...
February 2008
Dehalogenase from Methylobacterium sp. HJ1 induced by the herbicide 2,2-dichloropropionate (Dalapon)
Heavy industrial activities and agricultural processes require consumption of many halogenated compounds, and release them continuously as pollutants into the environment. These xenobiotics show high toxicity and persistence and cause many problems to the society, soils and ground water. Microbial dehalogenases are involved in the biodegradation of many important chlorinated compounds. A bacterial strain...
February 2008
Effect of some chemical preservatives on the shelf-life of sobo drink
The effect of some commonly used chemical preservatives (benzoic acid, sodium benzoate and sodium sulfite) on the shelf-life of Sobo drink was investigated by isolation of microorganisms before and during its ambient storage for 14 days. Three bacterial species, i.e. Lactobacillus acidophilus, Bacillus subtilis and Bacillus cereus were isolated. L. acidophilus was found only in the samples...
February 2008
Antibacterial activity of Senna siamae leaf extracts on Salmonella typhi
The aqueous and organic leaf extracts of the plant Senna siamae, traditionally used for the treatment of infectious disease, were tested for their activity against clinical isolates of Salmonella typhi using the disc diffusion method. The ethanol extracts showed the highest activity (zone of inhibition 10 ± 0.01 mm), followed by acetone extracts (zone of inhibition 8 ± 0.01 mm), while...
February 2008
Growth and survival of Salmonella zanzibar in juice and salami stored under refrigerated and room temperature
The vehicles usually involved in salmonellosis outbreaks are meat, eggs, poultry and milk. Recently, Salmonella outbreaks were reported in some vegetables such as tomatoes and unpasteurized juice. After inoculation of Salmonella zanzibar onto food samples, growth and survival of S. zanzibar in orange juice and salami were monitored. Our results showed that S. zanzibar is able to grow and survive in orange juice and also...
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