The stericstructure is the main effect on the herbicidal activity as results.
研究结果表明，影响其药效的主要因素是空间结构。
2
From structure of organic compounds, this paper analyses and discusses impact of acids basing activity of organic molecules about electronic effect, hybrid method and steric effect.
主要从有机化合物的结构出发，分析和判断了电子效应、杂化方式及空间效应等因素对有机分子酸碱性的影响。
3
These could be related to the difference in solubility of KGM, viscosity of the reaction system, steric hindrance, and granule structure of KGM with different Mw values.