继代培养基再利用研究

利用组织培养法繁育三倍体山杨继代丛生无根苗过程中,为降低育苗成本,利用回收转换后废弃的继代培养基,进行再利用试验研究,分别加入了原继代培养基１０％,２０％,３０％,４０％,５０％的母液,不加琼脂和糖,用原继代培养基做对照。     

Simulating responses of Northeastern China forests to potential climate change

IntroductionItissurethatpresentelevatiollsofCO2a11dotllergrcc11-housegasesinducedbyhumanactivitiesaren1akli1gglobalclimategothroughinexperielICedcl1anges(Scl1le-subgerl987).Thecurrentquasi-equilibriulllstatesofbio-sphereecosystCm,esPeciallyterrestrialecosystems,wouldbebrokenbecausetl1estructure,fu11ction,distributio11andtlledynamicsofanyexistedecosystemsareIberesultsoflongtermadaptationofbio-systemtocurrentclin1ate.Theec()systemsdistributedinhighlatitlldeareawouldhavemuchbiggerchai1ge(Bona…     

河南木兰属玉兰亚属植物数量分类的研究

本文采用系统聚类分析方法对河南木兰属玉兰亚属１４种植物进行研究。研究结果表明,聚类的分类特征性状不同,其结果差异显著。如①采用叶部分类特征性状聚类,则１４种植物明显聚为两大类：木兰类和玉兰类。该亚属玉兰组和望春玉兰组植物的聚类结果与其原分类系统相吻合,而木兰组和望春玉兰组应合并为一组,即木兰组。同时,调整了某些种的归属。②采用花部分类特征性状和③综合３８个分类特征特状的聚类结果相一致,不能作为玉兰亚属分组的依据和标准,即难以将１４种植物分成几个大的类别。但是,可以作为玉兰亚属种群鉴定、检验与划分的依据和手段。     

米老排不同定苗密度对苗木质量的影响

对采取不同定植密度的米老排育苗地进行了调查,结果表明:要培育优质米老排苗木,在强化圃地管理的同时,应在7—8月及时间苗,11月定苗,确保定苗密度保持在50~75株m^-2,能确保苗高、地径、主根长、>5cm侧根数均能达到苗木质量要求,Ⅰ级苗率达90%以上,且顶芽发育饱满、健壮、木质化程度高,抗逆性强。     

加快绿色化,迎接新世纪

在知识经济走向我们的时代,木材胶粘剂必须加快绿色化,成为生态材料,进入高技术产业行列。在我国,下世纪前十年内,低毒脲醛肢将成为主流产品;现用树脂胶的改性技术日益成熟,如三聚氰胺改性脲醛（ＭＵＦ）、苯酚改性脲醛（ＰＵＦ）等;利用天然资源制造的可降解胶粘剂用量提高,如木素胶、单宁胶、豆蛋白胶等;室温固化型胶粘剂品种增加,新产品用胶不断出现,如异氰酸酯等。另外,集科研、开发、生产于一体的专业胶粘剂产业将较快增长。     

山莓叶中茶多酚的提取工艺研究

用正交实验方法研究了从山莓叶中提取茶多酚的提取工艺,得到了提取茶多酚的最佳工艺条件。该工艺条件具有操作简单、产量高、无毒无污染、成本低等特点。     

三北地区大扁杏栽培管理实用技术

大扁杏是我国三北地区特有的经济树种之一。它适应性强,经济价值高。一般10～15年生杏平均收入1.5万元/(ｈ·ａ)。杏仁除含有多种营养成分外,还含有抗癌物质维生素Ｂ17,广泛应用于食品、医药等工业,是外贸出口产品,深受外商欢迎。栽植大扁杏是三北地区人民脱贫致富的一个?..     

观赏棕榈银海枣的研究进展

银海枣树形独特,景观效果佳,是值得推广的优良城市园林绿化树种.文章综述了银海枣的引种、耐寒机理研究、栽培技术、病虫害防治以及园林绿化应用研究进展,对其研究应用前景作了展望,并对生产应用存在的问题提出了相关建议.     

Anti-diabetic effects of emodin involved in the activation of PPARγ on high-fat diet-fed and low dose of streptozotocin-induced diabetic mice

Rheum palmatum Linn has been widely applied in the clinical treatment of diabetes mellitus. It has been found that emodin as the major bioactive component of R. palmatum L exhibits the competency to activate peroxisomal proliferator-activated receptor-γ (PPARγ) in vitro. So the aim of this study was to evaluate the anti-diabetic effects of emodin through the activation of PPARγ on high-fat diet-fed and low dose of streptozotocin (STZ)-induced diabetic mice. The diabetic mice were intraperitoneally injected with emodin for three weeks. No changes of food consumption and the body weight in emodin-treated mice were monitored daily during the entire experiment. At the end of experiment, the levels of blood glucose, triglyceride and total cholesterol in serum were significantly decreased after emodin treatment. However, serum high-density lipoprotein cholesterol (HDLc) concentration was significantly elevated. The glucose tolerance and insulin sensitivity in emodin-treated group were significantly improved. Furthermore, the results of quantitative RT-PCR analysis showed that emodin significantly elevated the mRNA expression level of PPARγ and regulated the mRNA expressions of LPL, FAT/CD36, resistin and FABPs (ap2) in liver and adipocyte tissues. No effects on the mRNA expressions of PPARα and PPARα-target genes were observed. Taken together, the results suggested that the activation of PPARγ and the modulation of metabolism-related genes were likely involved in the anti-diabetic effects of emodin.     

扭矩测量方法现状及发展趋势

按照不同的测量原理,将扭矩测量方法分为平衡力法、能量转换法和传递法三大类.根据被测物理参数的不同,重点分析了应用最为广泛的传递法扭矩测量所包含的各种方法,阐述了这些方法的原理、特点和适用范围,并归纳出扭矩测量方法的主要发展趋势.