Correlation between the absolute configuration and the CD spectra of organic peroxides was studied by ab initio method with a mo- d el moleeule CH_3-O-O-CH_3.For P form when 0°≤θ(twist angle of C-O-O-C) <90&...Correlation between the absolute configuration and the CD spectra of organic peroxides was studied by ab initio method with a mo- d el moleeule CH_3-O-O-CH_3.For P form when 0°≤θ(twist angle of C-O-O-C) <90°, there is positive Cotton effect;when 90°<θ≤180°, there is nega- tive Cotton effect;the curve is bisignate at θ=90°.展开更多
Passive voice is a common linguistic phenomenon both in Chinese and in English, while it is used differently in each language system. This paper takes the grammar features of passive voice in both Chinese and English ...Passive voice is a common linguistic phenomenon both in Chinese and in English, while it is used differently in each language system. This paper takes the grammar features of passive voice in both Chinese and English as an example, collecting corpus data of passive voice in the two languages, to comparatively analyze the cultural difference reflected from the usage of languages. Getting to know this kind of cultural difference would help us to better understand linguistic phenomena in second language acquisition, and to master them better.展开更多
English Listening is process onward step by step.Teachers ought to pay attention to specific conditions in the choice of listening materials,teach students in accordance with their aptitude,and cover materials of diff...English Listening is process onward step by step.Teachers ought to pay attention to specific conditions in the choice of listening materials,teach students in accordance with their aptitude,and cover materials of different levels.Recognize and resolve the problems that hinder the improvement of English listening,develop students' confidence and interest in English,and guide students to master the correct methods and techniques of English listening.展开更多
全球领先的关键任务制冷解决方案供应商STU L Z通过其美国公司STULZ Air Technology Systems,Inc.(STULZ美国),于5月19日宣布与CoolIT Systems,Inc.(CoolIT)建立战略投资与商业合作关系,CoolIT是适用于高性能计算、云和企业市场的直接...全球领先的关键任务制冷解决方案供应商STU L Z通过其美国公司STULZ Air Technology Systems,Inc.(STULZ美国),于5月19日宣布与CoolIT Systems,Inc.(CoolIT)建立战略投资与商业合作关系,CoolIT是适用于高性能计算、云和企业市场的直接接触液冷能效(DCLC^TM)技术的全球制造商。展开更多
为了阐明Stu-miR156在马铃薯侧根发育中的生物学功能,以马铃薯栽培品种‘Desiree’为试验材料,利用短串联靶标模拟物(Short tandem target mimic,STTM)技术,成功构建了Stu-miR156沉默表达载体,通过农杆菌介导法转化马铃薯获得了转化植株...为了阐明Stu-miR156在马铃薯侧根发育中的生物学功能,以马铃薯栽培品种‘Desiree’为试验材料,利用短串联靶标模拟物(Short tandem target mimic,STTM)技术,成功构建了Stu-miR156沉默表达载体,通过农杆菌介导法转化马铃薯获得了转化植株,qRT-PCR技术检测Stu-miR156及其靶基因StSPL9在转基因植株中的表达量。并通过构建pCAM-GFP-StSPL9融合蛋白表达载体转化烟草,发现靶基因StSPL9位于细胞质和细胞核中。q RT-PCR分析结果表明:在马铃薯转基因株系L1和L2中,Stu-miR156表达量受到严重抑制,在根、茎和叶中均不同程度地下调,其靶基因StSPL9均上调表达。表型分析表明:与野生型对照相比,转基因植株的侧根数量显著减少,生长受到抑制。展开更多
Saddlepoint approximations for the studentized compound Poisson sums with no moment conditions in audit sampling are derived. This result not only provides a very accurate approximation for studentized compound Poisso...Saddlepoint approximations for the studentized compound Poisson sums with no moment conditions in audit sampling are derived. This result not only provides a very accurate approximation for studentized compound Poisson sums, but also can be applied much more widely in statistical inference of the error amount in an audit population of accounts to check the validity of financial statements of a firm. Some numerical illustrations and comparison with the normal approximation method are presented.展开更多
文摘Correlation between the absolute configuration and the CD spectra of organic peroxides was studied by ab initio method with a mo- d el moleeule CH_3-O-O-CH_3.For P form when 0°≤θ(twist angle of C-O-O-C) <90°, there is positive Cotton effect;when 90°<θ≤180°, there is nega- tive Cotton effect;the curve is bisignate at θ=90°.
文摘Passive voice is a common linguistic phenomenon both in Chinese and in English, while it is used differently in each language system. This paper takes the grammar features of passive voice in both Chinese and English as an example, collecting corpus data of passive voice in the two languages, to comparatively analyze the cultural difference reflected from the usage of languages. Getting to know this kind of cultural difference would help us to better understand linguistic phenomena in second language acquisition, and to master them better.
文摘English Listening is process onward step by step.Teachers ought to pay attention to specific conditions in the choice of listening materials,teach students in accordance with their aptitude,and cover materials of different levels.Recognize and resolve the problems that hinder the improvement of English listening,develop students' confidence and interest in English,and guide students to master the correct methods and techniques of English listening.
文摘全球领先的关键任务制冷解决方案供应商STU L Z通过其美国公司STULZ Air Technology Systems,Inc.(STULZ美国),于5月19日宣布与CoolIT Systems,Inc.(CoolIT)建立战略投资与商业合作关系,CoolIT是适用于高性能计算、云和企业市场的直接接触液冷能效(DCLC^TM)技术的全球制造商。
文摘为了阐明Stu-miR156在马铃薯侧根发育中的生物学功能,以马铃薯栽培品种‘Desiree’为试验材料,利用短串联靶标模拟物(Short tandem target mimic,STTM)技术,成功构建了Stu-miR156沉默表达载体,通过农杆菌介导法转化马铃薯获得了转化植株,qRT-PCR技术检测Stu-miR156及其靶基因StSPL9在转基因植株中的表达量。并通过构建pCAM-GFP-StSPL9融合蛋白表达载体转化烟草,发现靶基因StSPL9位于细胞质和细胞核中。q RT-PCR分析结果表明:在马铃薯转基因株系L1和L2中,Stu-miR156表达量受到严重抑制,在根、茎和叶中均不同程度地下调,其靶基因StSPL9均上调表达。表型分析表明:与野生型对照相比,转基因植株的侧根数量显著减少,生长受到抑制。
基金National Natural Science Foundation of China(Grant Nos. 71032005, 70802035)the MOE Project of Key Research Institute of Humanities and Social Science in University (Grant No. 07JJD63007)supported in part by National University of Singapore (Grant No. R-155-050-095-112)
文摘Saddlepoint approximations for the studentized compound Poisson sums with no moment conditions in audit sampling are derived. This result not only provides a very accurate approximation for studentized compound Poisson sums, but also can be applied much more widely in statistical inference of the error amount in an audit population of accounts to check the validity of financial statements of a firm. Some numerical illustrations and comparison with the normal approximation method are presented.
