THE DIGESTION AND INACTIVATION OF MALTASE BY TRYPSIN AND THE SPECIFICITY OF MALTASES

1. The maltase of saliva and that of E. coli (B. coli communis) hydrolyze maltose but not α-methylglucoside or sucrose and are therefore to be considered glucomaltases. 2. Maltase is rapidly and completely inactivated and digested by trypsin.     

薇甘菊的危害与田野菟丝子的防除作用

 通过对东莞、深圳、汕尾、香港等地的11个薇甘菊(Mikania micrantha)危害并有田野菟丝子( Cuscuta campestris )生长的野外样地的调查研究,结果表明：薇甘菊的危害极其严重,对各样地的覆盖度高达75%～95%,样地共有111种植物,其中属于重度危害（III级）和极重度危害（IV级）     

THE PHOSPHATE ION AND HYDROLYSIS BY PANCREATIC LIPASE

The equation, (activity of enzyme) (pPO₄)ⁿ = K, has been investigated and has been shown to have only a limited application to the effect of the phosphate ion on the hydrolytic activity of pancreatic lipase. The deviations observed are ascribed to the effect of certain factors on the stability of the enzyme.     

前体化合物与诱导子对紫杉醇和紫杉烷类化合物合成的调控作用

添加Ｄ,Ｌ－β－苯丙氨酸和苯丙氨酸没有显著促进紫杉醇的合成,乙酸和苯甲酸对紫杉醇的合成有抑制作用,Ｃ１３位侧链合成的前体含量并不是合成紫杉醇的限制性因素。１￣３ｍｇ／Ｌ的α－亚麻酸没有促进紫杉醇和紫杉烷类化合物的合成。茉莉酮酸显著地促进了紫杉醇的合成,５ｍｇ／Ｌ茉莉酮酸处理的紫杉醇含量达到１３４μｇ／ｇＤＷ,是对照的９倍。     

地下害虫防治研究Ⅲ.666土壤处理防治地下害虫研究

应用666粉剂处理土壤以消灭地下害虫,如蛴螬、金针虫等,在其他国家研究这种方法的不少;但是由于害虫种类和生活史的长短、土壤性质、肥料的施用、以及耕作气候条件的不同,因而施用的药量和施用方法亦差异很大。在应用适当药量之下,可使害虫消灭较为彻底,其药剂毒效在土中可以维持相当长时间,因此在发展上不仅作为地下害     

THE PENETRATION OF THE INSECT CUTICLE BY DDT AND RELATED COMPOUNDS

The penetration of pp -DDT and some related compounds into grain weevils has been studied by a micro-analytical technique.
Grain weevils were exposed to filter papers, impregnated with the chemical under test, for periods varying from a few hours to several days. The chemical removed by washing the insects with cold methanol, which was not expected to dissolve anything which had penetrated below the wax layer of the epicuticle, was described as being 'outside' the insect; that which remained was extracted with ether after grinding the insects with anhydrous sodium sulphate and recorded as being 'inside' the insect. By plotting the amounts 'inside' and 'outside' after varying times of exposure a picture of the rate of penetration of these compounds was obtained.
The results are discussed in relation to similar curves published earlier for isomers of benzene hexachloride. The major difference revealed is the very slow penetration of pp -DDT compared with γ-BHC. This is ascribed to the vapour effect of γ-BHC which has a vapour pressure much greater than that of pp -DDT.