企业创新战略探讨——以正虹公司为实例

正虹公司技术创新应加强企业核心竞争能力的培育,以适应市场环境的要求,同时要关注企业内部,关注企业的特征和特质,找准自身的核心能力,提升竞争优势资源。     

英语口语水平测试研究

本文是关于湖南大学理工科学生英语口语水平的一项实验研究。这次水平测试对象涉及从本科生到博士生五个水平层次。评分采取三维量化,现场与事后两次性交叉进行。结果表明本项测试的信度、效度均较高,反映了我校理工科学生英语口语表达能力之现状,为日后加强口语教学提供了一些事实依据。本文还就口语测试客观化问题进行了讨论。     

Relationship among ovarian follicular status,developmental competence of oocytes,and anti‐Müllerian hormone levels: A comparative study in Japanese wild boar crossbred gilts and Large White gilts

The aim of this study was to investigate the ovarian follicular development, developmental competence of oocytes, and plasma anti‐Müllerian hormone (AMH) levels of Japanese wild boar crossbred (wild hybrid) gilts, whose litter size is inferior to that of European breeds. Ovary and plasma samples were collected from two different breeds of gilts (wild hybrid and Large White breeds). The ovaries from the wild hybrid gilts had a lower average numbers of secondary follicles and vesicular follicles in ovarian cross‐sections and of good quality oocytes collected from ovarian follicles as compared with those from Large White gilts (p < 0.05). The development rate to the blastocyst stage of good quality oocytes after in vitro maturation, fertilization and culture was also lower (p < 0.05) in wild hybrid gilts than in Large White gilts. Plasma AMH levels with >0.16 ng/ml were detected in 8.3% of the examined wild hybrid gilts and 33% of the Large White gilts. These results indicate that the low reproductive performance of wild hybrid breed may result in part from low numbers of vesicular follicles and good quality oocytes, and low developmental competence of oocytes. Moreover, plasma AMH levels may support low number of vesicular follicles in ovaries of wild hybrid gilts.     

Biological control of Sclerotinia minor using a chitinolytic bacterium and actinomycetes

Isolates of 85 bacteria and 94 streptomycete and 35 nonstreptomycete actinomycetes were obtained from a lettuce-growing field in Al-Ain, United Arab Emirates, on colloidal chitin agar, and screened for their ability to produce chitinase. Twenty-three bacteria and 38 streptomycete and 15 nonstreptomycete actinomycete isolates produced high levels of chitinase and were examined in vitro for their ability to suppress the growth of Sclerotinia minor , a pathogen causing basal drop disease of lettuce. The three most suppressive isolates were examined further for their production of β-1,3-glucanase and antifungal activity as well as their ability to colonize the roots and rhizosphere of lettuce in vitro and in planta . The three isolates, Serratia marcescens, Streptomyces viridodiasticus and Micromonospora carbonacea , significantly reduced the growth of S. minor in vitro , and produced high levels of chitinase and β-1,3-glucanase. Streptomyces viridodiasticus also produced antifungal metabolite(s) that significantly reduced the growth of the pathogen in vitro . When the pathogen was presented as the sole carbon source, all three isolates caused extensive hyphal plasmolysis and cell wall lysis. Serratia marcescens and St. viridodiasticus were competent to varying degrees in colonizing the roots of lettuce seedlings after 8 days on agar plates and the rhizosphere within 14 days in pots, with their competency being superior to that of M. carbonacea . All three isolates, individually or in combination, were antagonistic to S. minor and significantly reduced incidence of disease under controlled glasshouse conditions.     

认知语用学中的翻译观

本文对传统翻译活动进行了回顾，指出其理论基础的不足，在此基础上，从认知语用学的角度，对翻译的理解与表达活动进行了新的阐述，认为翻译理解实际上是译者对自身认知语境的搜索过程，翻译的表达是基于对读者认知语境的预测的交际策略的选择，并受原作者认知语境的制约。本文对翻译中的基本问题如直译或意译问题也作了探讨。     

木霉生防菌对植物生长的影响

 自木霉(Trichoderma)被发现具有生防价值以后,对其重寄生作用和拮抗成分的分析投入了大量的研究。而对植物生长的影响却被忽略了。象根瘤菌(rhizobia)和菌根真菌(mycorrhizae)一样,木霉能够对植物的生长产生明显的影响。它能产生植物毒性成分而抑制植物生长,也能通过产生激素和根际竞争能力促进植物生长,特别是它能诱导植物产生抗性。因此,仅对其抑制病原菌的能力进行讨论是不足够的。木霉在促进植物生长和诱导植物产生抗性具有真正的潜能。     

培养和提高学习者的语言运用能力刍议

分析了在学习英语过程中学生语言运用能力差的原因,指出传统的注入式教学给学生的语用能力带来的负面影响,并提出教师的反思行为、教师的教学情感及教师的课堂角色对学生语言运用能力培养和提高的重要作用。     

非英语专业研究生英语交际能力的跨文化因素影响研究

随着跨文化国际交流的日趋频繁,得体的跨文化交际能力成为我国高级人才的必备素质。然而,基于种种原因,非英语专业研究生的跨文化能力却比较薄弱。文章通过分析跨文化因素对非英语专业研究生英语交际能力各个方面的影响,指出"跨文化意识提升"在培养学生英语交际能力中的重要性,并提出了跨文化意识培养的具体策略。     

猪卵母细胞冷冻损伤的研究进展

卵母细胞冷冻保存技术的发展为体外受精、核移植以及转基因动物生产等胚胎工程技术提供了极大的灵活性,同时为家畜保种及珍稀濒危动物的保护提供了新的技术途径。在此,综述了以猪为主的家畜卵母细胞的冷冻保存的原理及冷冻保存对卵母细胞超微结构和发育潜力的影响,以期为猪卵母细胞的冷冻保存研究提供一定的理论参考,从而提高猪卵母细胞冷冻后的成活率和体外受精生产效率。     

浅析母语负迁移对英语学习的影响

“母语负迁移”是英语学习者学习目的语过程中普遍遇到的问题，也是英语学习者应该正视的问题。它增加了目的语学习的难度，在许多方面影响了目的语的学习，是英语学习的“瓶颈”。本文主要探讨“母语负迁移”对英语学习的负而影响，从而引起英语学习者的注意，减少或克服“母语负迁移”，以便轻松学好英语。