目的：为了探讨钉螺孳生地微环境理化因素对钉螺分布的影响。
Objective: to explore the impacts of the microenvironment physical chemical factors of snail habitat on the snails distribution.
植物组织或细胞培养结合理化因素的处理，可大大提高变异的范围和频率。
The techniques, developed in 1970, for plant cell and tissue culture provide the selection of resistant varieties with an advanced method.
生精细胞凋亡受神经内分泌因素、各种理化因素、特异性基因及基因突变等许多因素的影响。
The apoptosis of spermatogenic cells is influenced by multiple factors, such as neuroendocrine, physical and chemical factors, specific genes, and gene mutations.
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