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41种中药的诱变和抗诱变作用的研究 被引量:18
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作者 刘明哲 赵革平 +2 位作者 黄品篯 黄晓帆 胡钧 《癌变.畸变.突变》 CAS CSCD 1992年第3期25-28,4,共5页
对人参等41种常用中药水前提取物以Ames试验检测了其诱变性,结果表明41种中药水前提取物5.3-83.5mg/ml五个浓度点试均未见有诱发TA98和TA100回变作用。抗诱变试验表明8.4-33.4mg/皿的山楂、首乌、丹参、女贞子、大黄、松针和中华弥猴桃... 对人参等41种常用中药水前提取物以Ames试验检测了其诱变性,结果表明41种中药水前提取物5.3-83.5mg/ml五个浓度点试均未见有诱发TA98和TA100回变作用。抗诱变试验表明8.4-33.4mg/皿的山楂、首乌、丹参、女贞子、大黄、松针和中华弥猴桃根等7种中药水前提取物有明显的抑制2-氨基芴诱发TA98和TA100回变的作用,且抗诱变作用与中药水前提取物浓度呈正相关。 展开更多
关键词 中药 诱变性 抗诱变 Amer试验
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“Alone” VS. “Lonely”:Eudora Welty's Idyllic View on Life inDeath of a Traveling Salesman
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作者 刘现合 木拉提.吐尔别克 《海外英语》 2013年第18期183-184,共2页
In Death of a Traveling Salesman,Eudora Welty's idyllic view on life in the countryside,her nostalgic feelings for the loss of the American Southern tradition,and her protest against the industrialization of the c... In Death of a Traveling Salesman,Eudora Welty's idyllic view on life in the countryside,her nostalgic feelings for the loss of the American Southern tradition,and her protest against the industrialization of the city life are demonstrated by compar ing the"alone"of the couple in the countryside and the"lonely"of R. J. Bowman as a traveling salesman in the city. 展开更多
关键词 EUDORA WELTY idyllic VIEW INDUSTRIALIZATION Americ
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Amer1/WTX与APC相互作用的新结合位点鉴定 被引量:1
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作者 肖亚飞 吴更 《中国生物化学与分子生物学报》 CAS CSCD 北大核心 2014年第4期383-389,共7页
Amer1(APC membrane recruitment protein 1)又称为WTX(Wilms’tumor X),是首个发现位于X染色体上的抑癌基因.由于其定位的特殊性,Amer1近年来成为研究的热点之一.研究表明,Amer1作为骨架蛋白在细胞内与多种蛋白(APC,β-catenin,Axin等... Amer1(APC membrane recruitment protein 1)又称为WTX(Wilms’tumor X),是首个发现位于X染色体上的抑癌基因.由于其定位的特殊性,Amer1近年来成为研究的热点之一.研究表明,Amer1作为骨架蛋白在细胞内与多种蛋白(APC,β-catenin,Axin等)直接结合,在Wnt信号通路中发挥着重要功能.据报道Amer1/WTX含有3个肿瘤抑制蛋白质APC(adenomatous polyposis coli,APC)的结合位点,对于APC在细胞膜上的定位过程中发挥着重要的作用.但是,通过序列比对发现,Amer1可能存在第4个被忽略的APC的结合位点,定位于A1和A2之间.为了验证该片段能否与APC结合,分别构建了GST-Amer1(365-375)和His-APC(407-775)两种重组蛋白.通过GSTpull down,证明了这两个片段存在相互作用,并进一步通过ITC(isothermal titration calorimetry)实验测定了两者结合的亲和力.本研究结果不仅在体外证实了Amer1第4个APC结合位点的存在,也为APC和Amer1/WTX复合物的结构和功能的研究打下了良好的基础. 展开更多
关键词 Amer1 WTX APC蛋白 ARM结构域 GST-pull DOWN ITC
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Petrology, geochemistry, radioactivity, and M–W type rare earth element tetrads of El Sela altered granites, south eastern desert,Egypt 被引量:1
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作者 A.M.El Mezayen M.A.Heikal +3 位作者 M.G.El-Feky H.A.Shahin I.K.Abu Zeid S.R.Lasheen 《Acta Geochimica》 EI CAS CSCD 2019年第1期95-119,共25页
The southern part of the Eastern Desert of Egypt—about 30 km southwest of Abu-Ramad city—is mainly covered by ophiolitic rocks(Sul Hamed), island arc assemblage, younger granites(muscovite granites of Qash Amer and ... The southern part of the Eastern Desert of Egypt—about 30 km southwest of Abu-Ramad city—is mainly covered by ophiolitic rocks(Sul Hamed), island arc assemblage, younger granites(muscovite granites of Qash Amer and two mica granites of El Sela), and various acidic and basic dikes. Field, petrological, and geochemical studies indicate that the El Sela shear zone has been subject to hydrothermal and supergene alteration such as kaolinization, albitization, sericitization, and hematitization. It is invaded by quartz ENE–WSW veins associated with hydrothermal alteration accompanied by radioactive mineralization. The investigated younger granitic rocks had very low contents of compatible elements, such as Cr, Ni,and Co; and high contents of incompatible elements, such as Zr, and large ion lithophiles, such as Sr, especially in the El Sela shear zone. Major oxide and trace element analyses revealed calc-alkaline affinity and peraluminous character.These highly differentiated granitic rocks' lower Zr/Hf and higher Y/Ho than the normal ratio are consistent with hydrothermal alteration. Most samples had rare earth element(REE)-patterns with an M-type tetrad effect in the first and fourth segments and a W-type tetrad in the third segment. The average ∑REE in the studied granites was lower than the world granite average; the ratio of light to heavy REEs greater. The main radioactive, uranium-bearing, and uraniferous Fe and Mn minerals are uranothorite,autunite, uranophane and autunite as compounds, kasolite,columbite, xenotime, uranophane-bearing zircon and jarosite, silver-bearing pyrite, hematite, and autunite-bearing pyrolusite. 展开更多
关键词 GEOCHEMISTRY REE-tetrad effect Radioactive minerals Radiometric measurements Qash Amer EL Sela
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On the Americans'National Traits Reflected in The Adventures of Huckleberry Finn from the Perspective of History and Culture
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作者 金辉 唐岩 《海外英语》 2013年第15期186-187,共2页
The Adventures of Huckleberry Finn is Mark Twain's masterpiece,the one book from which,as Ernest Hemingway noted," All modern American literature comes ".It accounts the adventures of white Huck helping ... The Adventures of Huckleberry Finn is Mark Twain's masterpiece,the one book from which,as Ernest Hemingway noted," All modern American literature comes ".It accounts the adventures of white Huck helping black slave Jim escape and pursue freedom.Through their long journey along the Mississippi River,we can see panorama of America,such as its slavery,racial conflicts and integration,American Puritanism,and Westward Movement,etc.This thesis mainly deals with Americans'national traits reflected in The Adventures of Huckleberry Finn from the perspective of American developmental history and American culture. 展开更多
关键词 The Adventures of Huckleberry Finn MARK TWAIN Amer
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Distinctions between the Three Major Native Dialects of English 被引量:1
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作者 贺博闻 《海外英语》 2013年第4X期223-225,共3页
This paper focuses on essential distinctions between the major native dialects of English which are often divided by linguists into the three general categories of the British Isles dialects,those of North America and... This paper focuses on essential distinctions between the major native dialects of English which are often divided by linguists into the three general categories of the British Isles dialects,those of North America and those of Australasia.English learners might want to learn a standard accent,because maybe they need it in a play or maybe they want to impress their friends,or maybe they want to fit in better in a certain English speaking environment.The paper hopes to help Chinese English learners firstly isolate the distinctions among different but widely-used and officially-accepted accents and then speak good English by means of eliminating incorrect accent by imitating Standard English pronunciation. 展开更多
关键词 distinctions RECEIVED PRONUNCIATION general Americ
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“Made in China” gains acceptance
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《China's Foreign Trade》 2012年第7期35-35,共1页
"Made in China" is a phrase Americans know mainly as an indicator of pervasive offshore manufacturing. But increasingly it’s
关键词 ACCEPTANCE MADE in China OFFSHORE PERVASIVE Americ
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Willy Loman的美国梦缘何破灭(英文)
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作者 冯健高 《常州工程职业技术学院学报》 2011年第1期60-64,共5页
The death of Willy symbolizes the disillusionment of his American dream. Willy’s distorted personality is the direct cause, while the social system in his period is the root cause. These two causes determine the inev... The death of Willy symbolizes the disillusionment of his American dream. Willy’s distorted personality is the direct cause, while the social system in his period is the root cause. These two causes determine the inevitability of the disillusioning of his American dream. 展开更多
关键词 ARTHUR MILLER DEATH of a SALESMAN Willy Loman Amer
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Amer International Group Puts Its 100,000 T/a Precision Copper Wire Project In Xinjiang Into Operation
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《China Nonferrous Metals Monthly》 2020年第2期14-14,共1页
On November 26,2019,the industrial park project invested by Amer International Group in Xinjiang reached a milestone,i.e.the ceremony of opening of the Amer Xinjiang New Material Industrial Park&operation of 100,0... On November 26,2019,the industrial park project invested by Amer International Group in Xinjiang reached a milestone,i.e.the ceremony of opening of the Amer Xinjiang New Material Industrial Park&operation of 100,000 t/a precision copper wire project was grandly held.According to information available. 展开更多
关键词 PROJECT Amer INTERNATIONAL GROUP XINJIANG Into Operation
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Module 1 British and American English
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《时代英语(高二版)》 2014年第6期1-8,65,共9页
关键词 MODULE SOMETHING PERSONALITY FRIENDS SPEAKERS Amer
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