[Analysis of the risk factors of radiation-induced caries in patients with head and neck cancer].

Objective: This study aimed to evaluate the risk factors of radiation-induced caries by using a multiple linear regression equation and to provide the basis for the effective prevention of radioactive caries.

Methods: A total of 166 patients with head and neck cancer who underwent radiotherapy were selected as subjects. The number of decayed, missing or filled surfaces were recorded.

Mummified Oligocene fruits of Schima (Theaceae) and their systematic and biogeographic implications.

The genus Schima includes about 20 species and is distributed only in southern China and adjacent areas of Asia. The previous molecular phylogenetic analysis suggested Schima is in the tribe Gordoniae, along with Gordonia and Franklinia. However, because few fossils have been reported, the biogeographic origin of Schima is still poorly known.

Cyp2c19 genotype and omeprazole hydroxylation phenotype in Chinese Li population.

1. CYP2C19 is a polymorphism of cytochrome P450, which is responsible for the metabolism of many drugs. The genetic polymorphism shows interethnic variation and it has been demonstrated that the frequency of poor metabolizers (PM) and the distribution of alleles of CYP2C19 vary among Chinese ethnic nationalities.