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Many urine samples had concentrations below detection limits of some metabolites.
Many urine samples collected during the organic diet period continued to have detectable levels of all five pyrethroid metabolites.
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This relies on susceptibility data from local surveillance schemes as in many cases urine samples are only sent for microbiological evaluation following treatment failure, recurrent or relapsing infection.
Other investigators asked subjects if they smelled an unusual odor from asparagus urine (Sugarman and Neelon 1985), which is prone to false-positive results because many plain urine samples might be considered to have an unusual or distinct odor.
However Rodchenkov said that as many as 100 dirty urine samples were expunged during the Games.
By the end of the Games, Dr. Rodchenkov estimated, as many as 100 dirty urine samples were expunged.
Don Catlin, the former head of U.C.L.A.'s Olympic Analytical Lab, best known for breaking the Bay Area Laboratory Co-operative doping ring, oversaw the testing of many of Drug Free Sport's urine samples when he was at U.C.L.A.
Many first morning void urine samples collected in this study had no detectable OP metabolite levels, whereas the before bedtime urine samples collected the previous day contained detectable metabolite levels.
Because these studies used urine samples from many individuals (see e.g. Ref. 4), the sensor mice must have learned to recognize the MHC-specific difference (or a combination of multiple differences) against the variable volatile profile from these individuals.
The literature contains data on total cotinine and total NNAL in urine samples from many thousands of people.
Despite these limitations, the procedures used in this study were chosen due to the expense and inherent difficulties of directly measuring GFRs and collecting first-morning void urine samples and many blood and urine samples in a study with more than 10,000 participants.
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