[Efficacy comparison between surgical resection and endoscopic submucosal dissection of early gastric cancer in a domestic single center].

Objective: To compare the clinical efficacy of endoscopic submucosal dissection (ESD) and surgical resection for early gastric cancer (EGC). Method The retrospective case-control study was conducted. Clinical and pathological data of 246 patients who were diagnosed as early gastric cancer and received ESD or surgery for EGC at Peking University First Hospital from 2010 to 2015 were collected, including 171 males and 75 females with average age of (63.

[Diagnosis and surgical treatment of solitary fibrous tumor of the pelvis].

Objective: To explore the clinical diagnosis and surgical treatment of pelvic solitary fibrous tumor (SFT).

Methods: The data of nine cases of pelvic solitary fibrous tumor from April 2008 to February 2012 were reviewed retrospectively.

Results: There were 7 male and 2 female patients in this group with a median age of 56 years, of whom 6 were asymptomatic.

[Microscope observation of the microbial distribution on the wall of different pipe material in water supply system].

Scanning electron microscope, atomic force microscope and confocal laser scanning microscope were used to observe the microbial distribution and biofilm structure on the surface of stainless steel plugs and the wall of PPR pipe in the water distribution system. The results show that, it is not easy for microbial to attach on the surface of stainless steel plugs. Little bacteria was observed in a short period of time (less than 3 months).

[Effect of ammonia-oxidizing bacteria (AOB) on chloraminated disinfection attenuation in drinking water distribution system].

The growth of microbe and formation of biofilm in water distribution system were important factors affecting the security of water quality. The number of ammonia-oxidizing bacteria (AOB) in biofilm of a chloraminated drinking water distribution system in Shanghai was detected by MPN-Griess method, and the relations among AOB, nitrification and chloraminated disinfection were analyzed. Meanwhile, the effects of AOB on chloraminated disinfection fastness and attenuation by simulation experiment were studied.

Adapting the RUSLE and GIS to model soil erosion risk in a mountains karst watershed, Guizhou Province, China.

Soil erosion is a serious environmental problem in Guizhou Province, which is located in the centre of the karst areas of southwestern China. Unfortunately, Guizhou Province suffers from a lack of financial resources to research, monitor and model soil erosion at large watershed. In order to assess the soil erosion risk, soil erosion modeling at the watershed scale are urgently needed to be undertaken.