 หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Study of Dropping Speed in Eggs of Oncomelania hupensis, a Snail Intermediate Host of Schistosomiasis) ผู้เขียน: Xingjian Xu, Xianxiang Yang, Xiapin Li, Wei Zhang, Qingsang Pan, Zhengan Xiong สื่อสิ่งพิมพ์:pdf AbstractOncomelana hupensis (Gredler, 1881) is an intermediate host of Schistosomiasis japonica in China. In order to understand the factors controlling sedimentation and drifting of adult snails and snail eggs in rivers, three aspects were investigated by experiment. Firstly, the specific gravity of the snail eggs which was found to be 2.29 g/cm3 ; secondly, the range of dropping speed of the snail eggs through a water column which was found to be 1.19 to 3.77 cm/s; thirdly, a formula to determine dropping speed of the eggs was established. The formula was statistically validated by comparison with observed values. The results are relevant to both the development and design of irrigation schemes, and also to river management, where dispersal of snails and their eggs needs to be controlled. |