growing condition to favour for complete R or SR phenotype

Raymond Tsang rtsang at
Wed Nov 30 08:10:12 EST 1994

Dear Colleagues, 
I am looking for a condition to grow up Salmonella strains that favours 
temporarily the production of only low numbers (e.g. one) or even no 
O-specific side chains in their lipopolysaccharide. I would appreciate if 
someone can suggest a method or refer me to someone who might have the 
answer. Thank you. 
Raymond Tsang Ph.D.
National Laboratory for Enteric Pathogens, 
Bureau of Microbiolgoy, 
Laboratory Centre for Disease Control, 
Ottawa, Ontario, K1A 0L2. 
phone: (613) 941-1747
Fax: (613) 941-2408
e-mail: rtsang at

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