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Search Results: 1 - 10 of 1196 matches for " 唐中华 "
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人参皂苷生物合成途径及关键酶的研究进展
Advances in the Biosynthesis Research of Ginsenosides and Key Enzymes
 [PDF]

刘佳, 唐中华
Botanical Research (BR) , 2014, DOI: 10.12677/BR.2014.33013
Abstract:

人参皂苷是名贵药材人参中的主要有效成分,属于三萜类皂苷化合物,由于其具有改善记忆力、延缓衰老、抗氧化、抗炎作用以及抗肿瘤作用,近年来得到了广泛关注。在人参皂苷生物合成途径解析及其反应机制研究方面,目前已从人参属植物中克隆到20多个与人参皂苷生物合成相关的关键酶基因。本文综述了近年来国内外学者对人参次生代谢途径及关键酶基因研究的新进展,重点阐述了人参皂苷的生物合成途径,针对途径中新发现的关键酶及编码基因进行了详细的介绍。
Ginsenosides are the major bioactive ingredients of rare traditional Chinese herbs of Panax ginseng and belong to specific types of triterpene saponins. There is much evidence that ginsenosides exert beneficial effects in a wide range of pathological conditions such as cardiovascular diseases, cancer, immune deficiency, and aging. It was reported that about 20 key enzymes and the encoding genes related to the biosynthesis of ginsenosides from Panax genus plants have been identified. This paper summarizes new progress in ginseng secondary metabolic pathways and genes of the key enzyme, focusing on the biosynthesis pathway of ginsenosides. In addition, the newly cloned and functionally identified genes encoding those key enzymes in the ginsenosides biosynthesis pathway are introduced in detail.

可溶性糖对植物生长发育调控作用的研究进展
The Regulation of Soluble Sugars in the Growth and Development of Plants
 [PDF]

王嘉佳, 唐中华
Botanical Research (BR) , 2014, DOI: 10.12677/BR.2014.33011
Abstract:

可溶性糖如葡萄糖,蔗糖,在植物的生命周期中具有重要作用。它不仅为植物的生长发育提供能量和代谢中间产物,而且具有信号功能。它也是植物生长发育和基因表达的重要调节因子。在对植物进行调控时,它又与其它信号如植物激素组成复杂的信号网络体系。本文主要阐述可溶性糖对植物生长发育调控作用,以及在调控制过程中与植物激素和环境因子之间相互关系。
Soluble sugars, such as glucose and sucrose, play an important role in the cycle of plant life. They not only provide energy and mid-metabolites, but also act as signals, regulating the growth and development of plant. When regulating the plant, sugars with other signals such as hormone constitute complex transduction web. In this paper, we illuminate the regulation of soluble sugars in the development and growth of plant, and the interaction of soluble sugars and phytohormones, and environment factors.

长春花生物碱代谢生物学研究进展
The Catharanthus Terpenoid Indole Alkaloids: Metabolic Biology Review
 [PDF]

成海宁, 唐中华
Botanical Research (BR) , 2014, DOI: 10.12677/BR.2014.33012
Abstract:

随着长春碱和长春新碱日益成为近年来抗癌药物研发的重要对象,长春花生物碱受到了广泛的关注,与其相关的研究也随之得到了较快的发展。生物碱代谢生物学是在各门学科的基础上应运而生的一门跨领域的新兴交叉学科,它研究的是生物碱在代谢途径中的代谢生物学过程及其功能。本文从长春花生物碱的代谢途径、代谢控制因子,以及长春花生物碱的合成和贮存部位等方面,对长春花生物碱代谢生物学作以简要综述,对长春花生物碱的生物学功能的研究提出了展望。
The alkaloids in Catharanthus roseus are noticed extensively as vinblastine and vincristine have been the important anticancer drugs recently, and the concerned studies developed rapidly. On the basis of many disciplines, metabolic biology of alkaloid is a new interdiscipline which contains many fields, and what it studied is the biosynthetic process of the alkaloids in the biosynthetic pathway. This paper attempts to give a brief review on the metabolic biology of the alkaloids in Catharanthus roseus, involving the biosynthetic pathway, regulatory factors, and biosynthesis and storage position of the alkaloids in C. roseus, and the perspective of researches on biological function also has been given.

中国东北肇东盐碱土壤中水溶性胶体的研究
Study on the Water-Dispersible Colloids in the Saline-Alkali Soils in Zhaodong, Northeast of China
 [PDF]

刘志国, 祖元刚, 唐中华
Advances in Geosciences (AG) , 2015, DOI: 10.12677/AG.2015.52010
Abstract:
近来的研究结果显示土壤中的水溶性胶体可能对营养物质和各种污染物的迁移和转化起到关键作用。然而,目前国内外对土壤中水溶性胶体的系统研究和报道比较少。本文对中国东北肇东盐碱土壤中的水溶性胶体进行了提取和研究。使用了原子力显微镜,X射线衍射法和光电子能谱等技术对获得的水溶性胶体进行了表征。原子力显微镜观察结果显示这些水溶性胶体呈现为较大的片状固体以及粒径范围很广的球体。X射线衍射法和光电子能谱测定表明这些水溶性胶体是由高岭石,伊利石、方解石、石英石所组成。我们同时也对经过水解聚马来酸酐(HPMA)处理后的盐碱土壤中水溶性胶体以及邻近的农业土壤中水溶性胶体进行了测定和比较。测定结果揭示了盐碱环境有利于产生大量不同粒径的胶体而经过水解聚马来酸酐(HPMA)处理的盐碱土壤和农业土壤中则含有较少量的粒径较小的胶体。本研究所得到的结果可加深研究者对盐碱土壤的认识以及水解聚马来酸酐(HPMA)治理盐碱土壤的基本原理。
Recent studies indicated that water-dispersible colloids play important roles in transportation of nutrients and contaminants in soils. However, there are few systematic studies on the water-dis- persible colloids in soil so far. In this study, the water-dispersible colloids in the saline-alkali soils in Zhaodong, northeast of China, were extracted and further characterized by Atomic force microscopy (AFM), X-ray Diffraction (XRD), X-ray photoelectron spectroscopy (XPS). AFM observation indicated that the water-dispersible colloids contain some large plates and many small spherical particles with a wide range of size distribution. XRD and XPS measurement revealed that the wa-ter-dispersible colloids are composed of kaolinite, illite, calcite, quartz and humic acid. The wa-ter-dispersible colloids extracted from the saline-alkali soils pretreated with hydrolyzed polymaleic anhydride (HPMA) and an agricultural soil were also investigated and compared. The differences of the water-dispersible colloids in the saline-alkali soils and agricultural soil implied that the saline-alkali condition facilitate the formation of the large colloids. The present study is very useful for enriching the knowledge of the saline-alkali soils and understanding the reclamation mechanism of HPMA for the saline-alkali soils.
功能化酸性离子液体催化甲醛与烯烃的Prins缩合反应
宋河远,唐中华,陈静
分子催化 , 2008,
Abstract: 研究了以功能化酸性离子液体为催化剂,甲醛与烯烃Prins缩合反应生成1,3-二?烷及其衍生物,水解得到1,3-二元醇.对不同结构的离子液体、催化剂用量和反应条件进行了考察.结果表明,该体系具有良好的催化性能,反应可在较温和的条件下进行,实现了高活性和高选择性的目标.产物易分离,催化剂重复使用6次,其催化活性基本不变.
tac方案联合使用绿脓杆菌制剂在乳腺癌新辅助化疗中的应用研究
陈卫东唐中华徐峰
南方医科大学学报 , 2009,
Abstract:
水分胁迫及遮光处理对沙漠植物约书亚树(Yuccabrevifolia)幼苗光合特性的影响
刘力宁, 满秀玲, 唐中华, 李 奕
中国沙漠 , 2013, DOI: 10.7522/j.issn.1000-694X.2013.00109
Abstract: 以3年生约书亚树(Yuccabrevifolia)幼苗为试材,选择不同水分胁迫(相对含水量≥75%(正常)、50%~60%(中度)和35%~45%(重度))及不同遮光处理(自然光、60%透光和20%透光)进行试验,对幼苗光合特性指标及叶绿素相对含量值(SPAD)进行研究。结果表明:(1)随着水分胁迫的加剧,约书亚树幼苗净光合速率(Pn)、气孔导度(Gs)、水分利用效率(WUE)明显下降,但自然光下重度水分胁迫幼苗WUE值远高于其他处理。幼苗光饱和点(LSP)均表现为重度水分胁迫>正常供水>中度水分胁迫。(2)水分胁迫下,60%透光率处理的幼苗叶宽增加,Pn、蒸腾速率(Tr)及Gs明显提高,而20%透光率下幼苗各指标均显著降低。(3)相同光照条件下,随着水分胁迫的加剧,幼苗SPAD值明显下降;相同水分条件下,随着透光率的减小,幼苗SPAD值增大。因此,在约书亚树幼苗培育时,应适当增加水分胁迫以提高幼苗的水分利用效率及光饱和点,同时,适当的遮光环境(透光率在60%左右)也可提高幼苗的光合能力及SPAD值,确保约书亚树幼苗生长及在我国沙漠地区引种成功。
电场与燃烧耦合研究进展
许秦坤,周煜琴,唐中华
科技导报 , 2013, DOI: 10.3981/j.issn.1000-7857.2013.13.012
Abstract: 为了提高能源转换效率、降低燃烧副产物的排放,利用电场增强燃烧、控制燃烧火焰特性已逐渐引起研究人员的注意.本文从竖向、横向(即径向)和单电极式等不同的电场形式对燃烧场的影响展开论述.不同的电场形式下,通过改变电场参数,对电场中不同燃料的燃烧火焰特性变化规律进行研究,以此考查电场与燃烧耦合时的特性.研究表明,利用竖向电场力来平衡浮力可以粗略模拟微重力下燃烧时的扩散火焰,燃烧速率受电场强度影响,4kV时最小;利用横向电场可以改变火焰形状(如高度降低)及颜色,也可以助燃低热值燃料,实现可靠点火和稳定燃烧;对于单极式电场,观察到3种不同类型的振荡火焰.然后,对利用电场降低燃烧副产物的可行性进行了阐述.最后指出,迄今未见对不同电场形式与燃烧火焰特性的系统研究,缺乏相应的基础数据、电场参与下的燃烧反应动力学模型以及完备的燃烧场耦合机制分析.
土壤不同水分条件对长春花(catharanthusroseus)生活史型的影响
唐中华,杨蕾?,梁胜楠?,祖元刚?
生态学报 , 2007,
Abstract: 为了研究土壤中不同水分条件对长春花生活史型形成及生理代谢的影响,设置对照、轻度干旱、中度干旱和重度干旱等土壤水分梯度,对长春花(catharanthus?roseus?(l.)?g.?don)幼苗进行处理。对长春花形态指标进行聚类分析发现选择的20个聚类实体被分为2组,第1组为对照(ck)和轻度干旱(ld)处理的植株,第2组为中度干旱(md)和重度干旱(hd)处理的植株。运用主成分分析(principal?component?analysis,?pca)方法对不同土壤水分条件下长春花营养生长(vegetative?growth,?v)、有性生殖(sexual?reproduction,?s)和无性繁殖(clone?reproduction,?c)等3类15种性状进行统计。结果显示,长春花在对照条件下生活史型为v0.39s0.54c0.07,轻度干旱为v0.36s0.50c0.14,中度干旱为v0.53s0.27c0.20,重度干旱为v0.45s0.09c0.46,干旱程度加强显著提高了无性繁殖的比重,降低了有性生殖的比例。同时,对长春花中文朵灵、长春质碱和脱水长春碱等生物碱的含量进行了动态测定,发现重度干旱下的文朵灵、长春质碱和脱水长春碱的含量在16d时分别是对照水平的1.5倍、2.3倍和3.1倍,表明干旱胁迫诱导生物碱积累,为长春花高效栽培提供了理论依据。
甘草生活史型的划分
赵则海?,祖元刚?,唐中华,曹建国?
生态学报 , 2005,
Abstract: 探讨了甘草生活史型的定性和定量划分方法并对其结果进行了对比,结果如下:生活史型定性划分法基于生态幅与扰动程度对甘草生活的生境进行划分,将野生甘草、半野生甘草和栽培甘草分别划分为c、cvs和s生活史型。生活史型定量划分法是将生长于不同生境中甘草的营养生长、克隆生殖和有性生殖形态性状参数进行主成分分析,根据主成分得分比例划分生活史型。野生甘草定量划分结果为c0.4552s0.3150v0.2297型,总体上趋于c型生活史型;半野生甘草划分结果为c0.3540v0.3534s0.2926型,其营养生长、无性生殖和有性生殖发育比较均衡,属于cvs过渡生活史型;栽培甘草划分结果为v0.8931s0.0569c0.0500型,为比较典型的v生活史型。栽培甘草的定性、定量划分结果不一致的原因主要在于生长年限太少,克隆生殖和有性生殖均不发达。对植物生活史型的定量划分方法比定性划分法更为可靠、客观。
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