The ground base was evaluated and analysed by using biological index and variation of population of benthon which are effected by bottom water and mud environment.
以底栖动物作为底层水环境和底泥环境长期影响的指标，利用生物指数和种群结构的变化对底质进行评价和分析。
The paper also reviews polyphenolic types , property, distribution, physiological function, biological synthesis and genetic variation in tobacco.
本文还综述了烟草多酚的种类、特性、分布、生理功能、生物合成和遗传变异等内容。
The paper reports the study on the variation way of the relationship between mechano-physical properties as well as biological characteristics and planting periods of ramie.
本文以动态观点研究各季苧麻纤维的机械物理性能及生物学特性与生长期关系的变化规律。
Somatic mutation, a main biological phenomenon of citrus and other fruits, is often used for breeding as a major variation source. Spontaneous mutations often occur in citrus.
体细胞突变是柑橘等果树比较常见的生物学现象，也是品种选育，即芽变选种的主要变异来源。
Variation of space environment is driven by solar activity. Space radiation will lead to biological effects of space radiation.
空间生物学辐射效应是由空间辐射环境引起的，空间辐射环境的变化受太阳活动性影响。
It USES a biological point of view of genetics, with natural selection, genetic variation and other mechanisms to achieve the improvement of each individual adaptation.
它使用了生物遗传学的观点，拥有自然选择、遗传、变异等作用机制，实现各个个体的适应性的提高。
Epigenetic is the latest biological science in recent years, which mainly researches gene function reversible and heritable variation without DNA sequence changes.
表观遗传学是近年来新兴起的生物学学科，主要研究在没有DNA序列改变情况下基因功能可逆的、可遗传的变异。
The paper discusses variation trend of biological environment in DaQing city in recent years and puts forword countermeasures.
本文通过调查数据阐述了近年来大庆市生态环境的状况变化趋势，井提出对策。
The results showed there are rich and popular variation in many quantity characters such as fast-growth, resistance, adaption, and biological volume among clones of Salix psammophila.
研究结果表明 ，在沙柳无性系间速生性、抗逆性、适应性和生物量等数量性状存在丰富而广泛变异 ；
The results showed there are rich and popular variation in many quantity characters such as fast-growth, resistance, adaption, and biological volume among clones of Salix psammophila.
研究结果表明 ，在沙柳无性系间速生性、抗逆性、适应性和生物量等数量性状存在丰富而广泛变异 ；
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