Objective To assess the quantitative relationship between the distribution of Himalayan marmot and its ecological environment,the terrain,the temperature and the precipitation,using remote sensing and geographic information system in Qinghai province.Methods The distribution of Himalayan marmot was located by Google Earth and ArcGIS software and by using field survey data provided by Chinese Center for Disease Control and Prevention.The corresponding ecological environment of marmot including terrain,temperature and precipitation were derived from the spatial information datasets.All results were processed according to the overlay and statistics analysis using ArcGIS software.Results Seventy-seven point twenty-seven percent(153/198) of Himalayan marmot were distributed in the area of elevation between 3000 and 4000 meters.The number of marmot reached the highest when the slope was between 0 and 17 degrees,and aspect range was between 91 and 270 degrees,180 degree was as south direction.During the period with the maximum temperature of the warmest month of 14.3-17.5 ℃,17.6-20.8 ℃ and 20.9-24.0 ℃,the distribution of marmot reached 95％(186/198) of the total area.Meanwhile,most of the marmot were presented in the area with average precipitation of 46-108 mm.Conclusions A quantitative analysis of appropriate ecological environment of Himalayan marmot in a large scope is carried uul successfully using remote sensing and geographic information system.The study indicates that spatial information technology has important applications in plague prevention and control.

OBJECTIVE: To observe the safety and efficacy of rehepatectomy and radiofrequency ablation for patientswith recurrent hepatocellular carcinoma(HCC).METHODS: A consecutive sample of 159 recurrent HCC patients whounderwent rehepatectomy(n=77) or radiofrequency ablation(n=82) from January 2005 to December 2014 were analyzedretrospectively. Propensity score analysis was used. The Kaplan-Meier method was used for survival analysis.RESULTS: Propensity score analysis chose 41 pair patients. Patients in the radiofrequency ablation group were with lower rate ofperioperative mortality and morbidiy,shorter length of hospital stay. When calculate the survival time from the date ofrehepatectomy or radiofrequency ablation,or calculate the survival time from the date of the first hepatectomy,the twoarms showed similar overall survival(P=0.258,0.820). Moreover,overall survival were similar after propensity scoreanalysis(P=0.443,0.917).CONCLUSION: Radiofrequency ablation was safety,associated with shorter length of hospitalstay and similar long-term overall survival with rehepatectomy for recurrent HCC.

Aortoiliac occlusive disease (AIOD) refers to the stenosis and occlusion of the distal abdominal aorta and(or) bifurcation of the aortoiliac artery,which is mainly caused by atherosclerosis,leading to pelvic and lower limb ischemia.Open surgery has always been the main treatment for complex AIOD.However,in recent years,with the development of endovascular surgery technologies and medical instruments,its treatment concept has been greatly changed.More and more clinical evidence has proved that the long-term efficacy of endovascular therapy is not inferior to that of traditional open surgery,so minimally invasive endovascular therapy has become the preferred treatment for AIOD.
Aortic Diseases/surgery* ; Arterial Occlusive Diseases/surgery* ; Atherosclerosis ; Endovascular Procedures ; Humans ; Iliac Artery/surgery* ; Treatment Outcome ; Vascular Patency