异物质

X射线能谱分析说明根系内K的主动吸及Ca的被动吸收被紫茎泽兰内含的异克物质严重干扰，导致根系发育受阻。

The analysis of EPMA showed that the active transportation of K and the passive transportation of Ca in maize roots were obstructed , which retarded the growth of maize roots by allelopathic materials contained in plants of Eupatorium adenophorum .

饮用水中异嗅物质&土臭素及二甲基异冰片的测定方法

Measurement of odor causing compounds geosmin and 2-MIB in drinking water

研究了乙二硫醇与异戊醛物质的量比、催化剂用量、反应时间等因素对反应收率的影响。

Effects of mole ratio of1,2-ethanedithiol to isovaleraldehyde , amount of catalyst and refluxed time were investigated .

粪臭素是L-色氨酸的细菌降解产物，是引起反刍动物急性肺水肿和肺气肿（ABPE）的主要物质，同时也是产生猪肉异臭味的主要物质，严重危害家畜养殖。

Skatole , a compound formed by the bacterial degradation of tryptophan , causes acute bovine pulmonary edema and emphysema ( ABPE ) in cattle and is responsible for boar taint in pigs which may cause great damage to livestock raising .

岩浆演化过程中主要发生结晶分异作用，外来物质的混染作用较弱，混染物来自上地壳和俯冲板块。

The fractional crystallization is the main geological process in magmatic evolution , and contamination is weak . Two exotic components come from upper crust and / or subduction plate .