Study on Chemical Components of Alkaline Nitrobenzene Oxidation from Plantation Woods

This paper deals with the chemical components and the chemical structure of lignin of Chinese fir and Poplar I-214 from plantationforest. The results revealed that the contents ofchemical component in heart wood and sapwood were almost the same except ethanol-benzene extract both in Chinese fir and in Poplar I-214, The contents of ash, holocellulose, α -cellulose, pentosan, ethanol-benzene extract and cold-water extract in Poplar I-214 were higher than that in Chinesefir, The content of lignin in Poplar I-214 was lower than that in Chinese flr. Vanillin, vanillic acid and p-hydroxybenzaldehyde were found in Chinesefir while vanillin and vanillic acid, p-hydroxybenzoic acid, syringaldehyde and syringic acid werefound in Poplar I-214 in investigation of the chemical structure of lignin by using nitrobenzene oxidization method.     

中小水电机电设备科技进展（1）

随着小水电及农村电气化建设的发展，我国研制出了一批适用性强、针对性好的先进设备。文章集中介绍了在部分中小水电中使用的主机及辅机设备的新进展，并介绍了电站机电设备及输配电设备的近期配置模式。     

陕北黄龙山森林植物群落的初步研究

水文对森林植物群落的类型、结构、生活型谱、排序和动态做了初步研究。结果表明:森林植物群落分2个植被型,4个群系,19个群丛组;群落垂直结构分乔术、灌木、草本3层,植物组成分属于34科、76属108种;群落生活型谱反映了气候条件;群落排序结果满意;顶极植物群落为松栎林,山杨、白桦林将为辽东栎林演替,油松林与山杨林、白桦林之间的动态演替关系值得进一步研究。     

Identification of CpTI Gene Integration for 2-year-old Transgenic Poplars at DNA Level

The putative transgenic hybrid triploid poplars [(P. tomentosa P. bolleana) P. tomentosa] with CpTI gene have been outplanted in test field for 2 years. Although the authors previous studies have proved that they are highly resistant to 3 species of poplar-threatening insect pests and contain high content of CpTI protein in foliage, incorporation status of foreign CpTI gene in poplar genome is uncertain. In this present study, the incorporation of foreign CpTI gene in genome of 5 transgenic poplars was confirmed by PCR and Southern blotting analysis. DNA amplification showed that there were clear DNA bands of about 450bp specific to CpTI gene in transgenic lanes, while no corresponding band in non-transgenic lane was observed. Correspondingly, clear DNA hybridization signals and no signal were exhibited on film for DNA Southern blotting analysis in transgenic lanes and non-transgenic lane, respectively, which further confirmed the stable integration of foreign CpTI gene in genome of 2-year-old transgenic poplar.     

我国油菜品种变革对生产发展的影响

通过综述建国以来我国油菜品种三次变革对生产发展的推动作用，分析了我国油菜生产今后的发展潜力与对策。     

云南松毛虫发生与林分因子相关性研究

对云南松毛虫(Dendrolimus houi Lajonquiere)成灾与14个林分因子进行逐步回归分析，从中筛选出海拔高度、坡向、坡度、开阔度和土壤综合肥力5个关键因子，并用这5个因子建立多元回归模型。从中总结出了虫源地林分和有虫不成灾林分的特点。     

纤维素在鱼类饲料中适宜含量的研究概况

纤维素是鱼类重要的营养素,文章分析了有关纤维素的作用、鱼类饲料中纤维素的适宜含量及影响因素、饲料中纤维素含量过多的危害,同时,对一些研究方法也做了相应评价,对未来的研究方向提出了个人观点。     

中国饲料成分及营养价值表2005年第16版说明

一、本表是在《中国饲料成分及营养价值表1990年第1版～2004年第15版》的基础上,结合(1)中华人民共和国农业部颁布的猪、禽饲养标准;(2)国家科技部科技基础性项目——中国饲料科技基础数据整合与共享;(3)《奶牛精细养殖综合技术平台》和《猪精细养殖综合技术平台》等著作的编写等工作而修订的。该版增加和完善了饲料中的ADF和NDF数据,同时根据国内实际测定的饲料成分或养分数据,并参考了国际上同行同期在猪、鸡用饲料营养价值方面的评定结果,又对部分发布过的生物学效价数据进行了调整。二、本表中有关常规饲料营养成分及有效能值基本上…