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Positive chemotaxis is movement toward the source of the chemical stimulus (along the chemical concentration gradient in air or water); negative chemotaxis is movement away from the source. The phenomenon is known to exist in a number of microorganisms and invertebrates.
Positive diagnosis for a lactulose SIBO breath test â typically positive if the patient produces approximately 20 ppm of hydrogen and/or methane within the first two hours (indicates bacteria in the small intestine), followed by a much larger peak (colonic response). This is also known as a biphasic pattern.actulose is a carbohydrate that is not absorbed by humans. Lactulose is well known to measure oro-cecal transit time. The mean oro-cecal transit time in normal healthy individuals is 70 to 90 minutes. By 90 minutes, at least 50% of individuals would have delivered the lactulose dose to the colon.