Variations of concentrations of elements in needles of Pinus massoniana(L.) along an urban-suburban gradient in Guangzhou;
广州城郊环境梯度下马尾松针叶元素质量分数变化特征
Studies on diterpenes in needles of Pinus sylvestris;
樟子松针叶中二萜类成分研究
Change of ABA content inside the damaged Pinus massoniana needles.;
受害马尾松针叶内脱落酸含量的变化
Nutrient contents and resorption characteristics in needles of different age Pinus massoniana (Lamb.) before and after withering;
不同林龄马尾松针叶凋落前后养分含量及回收特征
With the appearance observation and the determination of the contents of Cr,Zn,Pb,Mn,Fe,Cu and S in different ages of needles of Pinus.
ExEndl)不同年龄针叶中Cr,Zn,Pb,Mn,Fe,Cu等重金属元素及元素S质量分数的分析,探讨了它们与北京大气污染之间的关系。
Objective: To study the non-taxoids in the leaves of Taxus mairei.
目的:研究美丽红豆杉针叶中的化学成分。
The influence of PFI beating on fibre and handsheet properties of hardwood and softwood kraft pulps was investigated.
研究了针叶木和阔叶木硫酸盐浆PFI打浆对各自纤维性质及浆张性能的影响。
Physico-chemical characteristics of ambient particles settling upon leaf surface of six conifers in Beijing;
北京市六种针叶树叶面附着颗粒物的理化特征
The Development and the Prospect on the Conifers Grafting;
针叶树嫁接研究进展与展望
Field Performance of Introduced Conifers in Zhanggutai Sandy Area, Liaoning Province;
章古台沙地针叶树引种造林试验
The potentiality of the conifer leaf glue to be exploited and utilized is relatively great.
针叶胶的开发利用潜力很大。
The results are as follows: temperature is the most important factor of cellulase on extracting the conifer leaf glue from cedar;when the enzyme concentration is higher than 20 U/g,it has little effect on the extraction rate;when the extration temperature is 50℃,the.
以松针为材料,用正交实验分析了影响纤维素酶活力的三个主要因素,并根据正交实验结果,对单个因素的多个水平进行了比较分析,结果表明:温度是影响纤维素酶提取针叶胶的最主要因素;酶用量高于20U/g以后,对针叶胶提取率影响不大;在温度50℃、pH5。
To recycle calcium carbide residue that was the waste by-product of industry,needle-like calcium carbonate was synthesized by calcium carbide residue.
为有效利用电石渣资源,以电石渣为原料合成了针叶形碳酸钙。