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Feeding for 24h by third instar larvae of the maize stalk borer induced farnesyl pyrophosphate synthase gene expressing, but had no effect on expression of AOC, BX9, PAL and PR2a genes and DIMBOA content.

3玉米螟3龄幼虫处理24h能诱导玉米根中法呢烯基焦磷酸合成酶基因表达，但不能诱导丙二烯氧化物环化酶、β－1，3葡聚糖酶基因（PR2a）、糖基转移酶（BX9）、苯丙氨酸转氨酶基因表达，同时对第二叶和根中丁布含量无显著影响，使第二叶对羟基苯甲酸及第三叶丁布、对羟基苯甲酸、香草酸含量显著降低。

According to invesstigation naturalenemy insects are parasite wasps,beetles and ladybugs.There are18 kinds of natural enemy insects identified.Natural enemy insectshappen in every instar of White Wax Scale;when it is serious,it canmake all the colony die in one area.

据统计，危害白蜡虫的天敌有小蜂，蜡象和瓢虫等，已鉴定到种虫的天敌有18种，天敌危害发生在白蜡虫的各个虫期，严重时可使整个白蜡虫种群在某一个地区内绝种。

Total alkaloid from Tripterygium wilfordii Hook was bioassayed with Mythimna separate for its insecticidal activities. The antifeedant effect of the total alkaloid on third to fifth instar larvae of M. separate increased with the treatment concentrations.

为进一步评价雷公藤中主要杀虫活性成分生物碱的杀虫活性及其应用前景，采用室内生测法研究了雷公藤总生物碱对粘虫Mythimna separate取食，存活及生长发育等的影响。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。