Tongwei Xia

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The urinary metabolites of phthalates are well-accepted exposure biomarkers for adults and children older than 6 years but are not commonly used for infants owing to non-convenient sampling. In the light of this situation, a novel sampling method based on monitoring the urine expressed from the gel diaper was developed. The urine was expressed from the gel(More)
The gelatinases (type IV collagenases) are members of the matrix metalloproteinase family that not only have a high degree of structural homology but are known to be nearly identical in their digestion profile against macromolecular substrates. We have shown previously that the preferred cleavage sites in the hydrolysis of type I gelatin, catalyzed by(More)
Infant exposure to endocrine disruptors (EDs) may cause adverse health effects because of their fast growth and development during this life stage. However, collecting urine from infants for exposure assessment using biological monitoring is not an easy task. For this purpose, we evaluated the feasibility of using urine expressed from disposable gel(More)
Extensive knowledge exists inEscherichia coli about the contiguouspheA andaroF-tyrA operons which have opposite transcription orientations and are separated by a bidirectional transcription terminator. The corresponding structural genes and individual components of the terminator and attenuator fromErwinia herbicola have been analyzed from an evolutionary(More)
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