中药拳参化学成分及药理活性研究进展

综述了中药拳参的化学成分和药理学活性研究,并对其今后研究开发的方向作了初步探讨.     

QTL analysis of flag leaf in barley (Hordeum vulgare L.) for morphological traits and chlorophyll content

To understand genetic patterns of the morphological and physiological traits in flag leaf of barley, a double haploid (DH) population derived from the parents Yerong and Franklin was used to determine quantitative trait loci (QTL) controlling length, width, length/width, and chlorophyll content of flag leaves. A total of 9 QTLs showing significantly additive effect were detected in 8 intervals on 5 chromosomes. The variation of individual QTL ranged from 1.9% to 20.2%. For chlorophyll content expressed as SPAD value, 4 QTLs were identified on chromosomes 2H, 3H and 6H; fur leaf length and width, 2 QTLs located on chromosomes 5H and 7H, and 2 QTLs located on chromosome 5H were detected; and for length/width, 1 QTL was detected on chromosome 7H. The identification of these QTLs associated with the properties of flag leaf is useful for barley improvement in breeding programs.     

水稻芽期耐冷性主效QTLqSCT-11的分子标记定位

以粳籼交Lemont／Teqing的F13RILs群体为作图群体,构建水稻芽期耐冷性主效QTLqSCT-11所在染色体区段的高密度分子标记连锁图谱,用于主效QTLqST-11的分子标记定位与分析。通过测定粳籼交Lemont／Teqjng的RILs群体在10℃低温的芽期耐冷性,WinQTLCart2．5软件对耐冷性性状进行复合区间作图,结果表明此主效QTL位于11号染色体短臂近着丝粒区域ID7924-3与RM202标记之间。     

母语在外语教学中的积极作用

在外语教学中使用母语对学习者进行帮助是提高语言学习者学习积极性的重要手段之一,使用母语能够简化对目标语言的理解,同时提升学习者的学习自信心。     

论信用证欺诈的种类、形式及防范措施

信用证欺诈有其产生原因和各种表现形式。本文试图探讨信用证欺诈的种类、形式及防范措施,并提出选择FOB贸易条件和适用信用证欺诈例外原则作为我国企业进出口贸易防止被欺诈的有效的对策。     

笃斯越桔根导管分子穿孔板的类型及演化

离析笃斯越桔根次生木质部，其细胞组成有纤维管胞；一端为网状穿孔板，另一端为孔纹增厚的导管分子；两端均为网状穿孔板的导管分子；一端为网状穿孔板，另一端为梯状穿孔板的导管分子；一端为梯状穿孔板，另一端为单穿孔板的导管分子；两端均为雌穿孔板的导管分子．在笃斯越桔根的个休发育过程中重演了导管分子穿孔板的系统演化过程．     

凤仙透骨草化学成分研究

目的：研究凤仙花科凤仙花属植物凤仙花干燥茎中的化学成分。方法：利用硅胶,Sephadex LH-20及大孔吸附树脂等色谱法分离凤仙透骨草的化学成分,用波谱方法鉴定其结构。结果：从凤仙透骨草中分离并鉴定了4种化合物,分别为槲皮素（quercetin,1）,2-甲氧基-1,4-萘醌（2-methoxy-1,4-naphthoquinone,2）,β-胡萝卜苷（daucosterol,3）,槲皮素-3-O-葡萄糖苷（quercetin-3-O-β-D-glucoside,4）。     

英语专业二语限时写作中词汇策略的重要性

研究主要分两个阶段进行写作测试,对50名云南师范大学英语专业二年级学生在二语限时写作中的词汇使用情况进行分析对比。研究发现,在二语限时写作的条件下,英语专业学生使用了过多的低级词汇。对此,研究者提出在二语写作教学中应采取一定的词汇策略,以培养英语专业学生的词汇能力和提高写作质量。     

The incidence of cross-licensing: A theory and new evidence on the firm and contract level determinants

This paper examines the firm and contract level determinants of the incidence of cross-licensing among manufacturing firms. It develops a simple stochastic theory explaining such incidence, which implies that cross-licensing, compared with unilateral licensing, is more prevalent between large and symmetric firms under a reasonable set of assumptions. We find strong empirical support to these implications, based on a new dataset of more than 1100 licensing contracts by Japanese manufacturing firms. We also find that the incidence of cross-licensing is higher when the contract covers only patent than when it covers only know-how, consistent with the theory. The licensing probability between two firms depends primarily on the size of a potential licensor, which, according to the theory, is consistent with the fact that a licensor is larger than a licensee on the average.     

中药抚芎的原植物及其与川芎、藁本的比较

The  vegetative  characters of  Ligusticum  chuanxiong  Hort.  cv.  Fuxiong are described in comparison with L. chuanxiong Hort. and L. sinense Oliv. The chromosome numbers and karyotypes of the three taxa were studied in root tip cells by Feulgen’s squash method. Their karyotypes are determined as follows: L. chuanxiong, K(2n)=22=16 m+ 4sm+2st (sat); L. chuanxiong cv. Fuxiong, K(2n)=33=24 m+6sm+3st (sat); L. sinen- se, K(2n)=22=12 m+6sm+2sm (sat)+2st (sat).      The karyotypic similarities are found between L. chuanxiong and its cultivariety, butthe former is a diploid while the latter probably is a homologous triploid.