University of CaliforniaBerkeley and professor of psychology at Tsinghua University. His work has appeared in the New York Times Magazine and The Scientist, and he is on the editorial board of the journal Nutrition. I started self-experimentation when I was a grad student. I was studying experimental psychology; self-experimentation was a way to learn how to do experiments. One of my rst self-experiments was about acne. My dermatologist had prescribed tetracycline, an antibiotic. Just for practice, I did an experiment to measure its e ect. I varied the dosage of tetracycline--the number of pills per day--and counted the number of pimples on my face each morning. First I compared six pills per day (a high dose) and four pills per day (the prescribed dose). Somewhat to my surprise, they produced the same number of pimples. I tried other dosages. Eventually I tried zero pills per day. To my shock, zero pills per day
L. plantarum have been found to show such factor synthesis, has been recently identified. resistance (Holley and Blaszyk 1997; Teuber Remarkably, strains of S. xylosus were iso- and Perreten 2000; Gevers et al. 2003). Some lated from patients who had an underlying genetic determinants, such as chlorampheni- disease. The same species has been reported col acetyltransferase (cat-TC), erythromycin to be involved in infections of poultry (ermB), and tetracycline (tetL, tetM, and tetS (Aarestrup et al. 2000). resistance genes), have been identified, sug- Although CNS of food origin has not been gesting that horizontal gene transfer may found to produce nosocomial infections, Starter Cultures for Meat Fermentation 213 some strains that produced enterotoxins have the selection of strains well adapted to the been described. Vernozy-Rozand et al
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