[Seasonal dynamics of the physicochemical properties of biological crusts exopolysaccharides and the microbial community structure].

Exopolysaccharides (EPS), an important substance of cyanobacteria in resisting stresses, are the main form of carbon storage in biocrusts and play an important role in material cycling and stability of biocrusts. In this study, the biocrusts in different seasons (January, April, July, October) were collected from Gurbantunggut Desert, and the dynamics of EPS content, composition, morphological characteristics and microbial community structures were analyzed. The results showed that: 1) The excretion of EPS showed obvious seasonal dynamics.

Prevalence and geographic disparity of depressive symptoms among middle-aged and elderly in China.

Background: To evaluate the prevalence of and risk factors for depressive symptoms among middle-aged and elderly Chinese in northern and southern China.

Methods: A population-based cross-sectional survey was performed in Beijing and Shanghai. Participants included 3289 community residents aged 50-70.

[Correlation between expression of vascular endothelial growth factor and prognosis of patients with esophageal squamous cell carcinoma].

Background & Objectives: Angiogenesis plays an essential role in tumor growth, invasion, and metastasis. Vascular endothelial growth factor(VEGF) is regarded the most important angiogenetic growth factor and it has been found in many kinds of tumors that its high expression can promote tumor progression and effect prognosis. However, there was few reports about the relationship between the VEGF expression and the progression and prognosis of the patients with esophageal carcinoma.