[The characterization of scaffold made of N,O-carboxymethyl chitosan and tricalcium phosphate].

Purpose: To study the mechanical and chemical characterization of scaffold made of N,O-carboxymethyl chitosan (N,O-CMCS) and tricalcium phosphate(TCP) with various weight ratios.

Methods: Three composites of N,O-CMCS/TCP with weight ratios of 2:1,1:1 and 1:2 were mixed using the same volume of distilled water. The characteristic bands, morphologic structure, compressive strength and Young modulus of the composites were analyzed by infrared spectroscopy (IR),scanning electron microscopy(SEM) and universal testing machine respectively.

[Observation on the ultrastructure of Pneumocystis carinii].

Objective: To study the life cycle and morphology of Pneumocystis carinii by ultrastructural observation.

Methods: Wistar rat model of P. carinii infection was established by subcutaneous injection with dexamethasone.

[Effects of lead exposure to rat placenta and pups during different gestation periods].

Objective: To investigate the effects of lead exposure to rat placenta and pups during different gestation periods.

Methods: All 108 Wistar rats (72 females, 36 males) were randomly divided into four groups. All rats were orally fed with 0.

Inhibitory effect of polypeptide from Chlamys farreri on UVA-induced apoptosis in human keratinocytes.

Polypeptide from Chlamys farreri (PCF, Mr = 879) is a novel marine active product isolated from gonochoric Chinese scallop Chlamys farreri which has been served as sea food for several thousand years. As an octapeptide, PCF consists of 8 amino acids, namely, Pro, Asn, Ser, Thr, Arg, Hyl, Cys, and Gly. PCF had been identified as a marine chemopreventive drug that protected hairless mice's epidermis against UV-induced damage in our previous study.