Mammal metallothionein(MT) folds into two separate domains that exhibit different structure and metal binding propertity independently, the study of the strategy of metal ions binding with MT would give better understanding of their exact biological functional mechanisms. In this study, a method using eletrospray ionization mass spectrometry (ESI-MS) phase liquid chromatography and identified by ESI-MS. Different amounts of Cd or Cu were then added in MT-2a samples and ESI-MS was employed to determine the mass difference of MT in different samples. The results Cd2+4S11; while Cd is attached in separate binding sites for the formation of Cd2+3S9 cluster, which intermediately formed with five and six Cd ions were detected. For the Cuprous ions, it prefers to cooperatively bind in β-domain with the form of Cu4-MTβ. The binding form in β-domain would convert from Cu4 into more Cu binding form with the addition of Cu. When high concentration of Cu was added in samples, the result suggested that

Objective To be investigated the morphology of colorectal small flat adenoma and the expressions of p53 , p21, ER and PR. Methods Colonoscopy ( Olympus CF 240) and microscopy ( Olympus BV 41) were used to observe 50 cases of colorectal small flat adenomas. The expressions of p53 , p21 , ER, and PR were detected by the two steps of immunohistochemistry in 50 cases of small flat adenomas and the surrounding mucosa, 26 cases of colorectal carcinomas, while 15 cases of the normal colorectal mucosa as control group. Results These lesions were distributed throughout the large bowel, the prevalence in order was transverse colon, sigmoid and rectum. The small flat adenoma was round, flat, or sessile in shape, and sized