系统功能语法理论因其独到的功能主义和社会意义学视角,而为越来越多的人接受.它把语篇作为研究的基本单位,从语篇与语境的互动关系中揭示语言的性质和社会功能.对报刊英语新闻进行功能语篇分析可以进一步加深对新闻的理解,以韩礼德语法理论的功能语篇分析模式为依据,对一则英语新闻进行及物性结构、语气结构和主位结构的分析,有益于对英语报刊新闻的深化认识和理解.

The hairy roots induced by Agrobacterium rhizogenes A 4 were cultured and the effects of different nutrition elements, carbon sources and primary sugar density, hormone as well as temperature and shaker speed were compared. The results showed that when cultured in 1/2B 5 culture with high concentration of initial sucroseand 1mg/L 6 BA and 500mg/L L tryptophan in 28℃and 75r/min, hairy roots grew well and alkaloid production was high.

A Penicillium sp.which can produce phytase with high-activity has been screened and mutated by UV.The best phytase-producing medium is: 3% soluble starch,0.5% peptone,0.5% NH 4NO 3,0.05% MgSO 4·7H 2O,0.05% FeSO 4·7H 2O,0.001% MnSO 4·4H 2O.Primary pH of medium at 6.5,inoculum size at 4%(V/V),fermentation for 72 hours are beneficial to the yield of phytase.The adding of a small quantity of phytate can stimulative the produce of phytase,while excessive phytate will inhibit the reaction.

The results of the orthogonal experiment design showed that the fittest carbon sourse was 3% sucrose and nitrogen was 1.25% soya peptone,025% beef extract for Streptomyces sp.RX-17 produing bacteriolytic enzyme.The study of the optimum cultivation conditions indicated that aeration had singificant effect on the production of the enzyme.The optimum temperature and pH of the lytic activity was 60℃ and 6.0.In alkaline circumstance the enzyme was easy to keep activity.About 36.3% of the original activity remained after 1 hour at 60℃.The lytic activity was very sensitive to the variety of the ionic strength.The enzyme had a broader bacteriolytic spectrum posessing high activity against Streptococcus mutans and Staphylococcus aureus which were resistant to egg-white lysozyme.

通过动物实验比较了白首乌总甙、醇提物和全粉的功效性和毒性.结果表明三种样品中醇提物的功效性最好,可能是因为其提取了白首乌中包括C21甾甙在内的多数活性物质而又易于吸收利用所致:醇提物和全粉未表现出急性毒性反应,总甙具有一定的急性毒性.这说明虽然C21甾甙是白首乌的主要有效成分,但以醇提物的方式开发白首乌保健食品更具有实际意义.

经实验确定了甾苷定量测定的官能团反应方法.用定量测定3-羟基族化合物的最特效的方法磺基醋酸汞试剂法直接测定C21甾苷元的C3-OH,从而间接测定C21甾苷,实验证明该方法是可行的.

采用强饲式代谢试验方法测定了高活性植酸酶对生长公鸡(杂交肉食)的消化性及其生长性能的影响.结果表明:饲料中高活性植酸酶的适宜用量为每公斤300单位;饲料中使用该酶,磷的表观代谢率获得较大幅度的提高,包括氨基酸等其他营养物质的表观代谢率也同时获得相应的提高;添加该酶的同时,减少饲粮中70%的无机磷使用量,其结果不影响生长鸡的正常增重,还减少了1/3的粪磷排出量.