检索结果-南通市图书馆

Journal of Life Sciences 2011年第11期5卷 879-883页

作者： david Pan Laboratory of Animal resources Medical School University of Wisconsin Madison Wisconsin 53706 USA

A newly discovered enzyme, that can catalyze the formation of phosphotriester/-diester bonds between nucleic acids, was found to be associated with plant and animal viruses; （i.e. southern bean mosaic virus, brome mosaic virus, influenza virus, avian virus and mouse retrovirus）. A partially purified enzyme from maize developing endosperms was prepared through 15%-35% ammonium sulfate fractionation, DEAE-cellulose anion exchange column chromatography and Sephadex GI50 gel filtration. The enzyme preparation was then used to demonstrate its main functional characteristics. The enzyme can use varieties of short and long chain length of nucleotides as substrates. However, the enzyme requires at least a minimum of 3 to 4 units of nucleotide chain length for the reaction to occur. The enzyme activity shows an optimum reaction in 50 mM sodium acetate buffer at pH 5.4 and is significantly inhibited by 6-azauridine as compared to other nucleotide analogs. By analyzing the data documented in literature and the results from the present study of the association of this enzyme with viruses and the distinctive inhibitory effect of 6-azauridine, it is speculated that this enzyme is likely associated with many other plant and animal viruses. The association of this enzyme on the surface of virus particles can be explored as a common antigen for developing a versatile antiviral vaccine.

关键词： Virus associated enzyme "phosphotriester/-diester bond linkase" sugar phosphate backbone of DNA 6-azauridine

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Learners for Life

空中英语教室（高级版．彭蒙惠英语） 2021年第11期 6-7,38页

作者： david Jesse 不详

His tassel draped correctly from his cap,and his graduation robe carefully arranged so just the top of his maroon and gold tie showed,Michael Duthler extended his fist toward Bill Corner for one last fist bump.

关键词： Learner carefully arrange

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

China＇s Late Bloomer

China International Business 2006年第7期 32-36页

作者： david HENDrICKSON

Once scorned and unappreciated, flowers are today big business in China. However, challenges to industry growth and profitability remain.

关键词：中国花卉产业 2006年发展市场

MIGrATION AFTEr MIDDLE-AGE

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

The World of Chinese 2017年第2期 90-91页

作者： david DAWSON

Elderly Chinese are moving abroad to join family,but their journeys are far from smooth随子女移民海外,老人们在异国他乡努力寻找属于自己的生活Migrating abroad is among the toughest challenges a person can face in *** young people,in the prime of their lives and careers,it’s *** elderly people with little experience of foreign countries,it can be downright terrifying.

关键词： have with of is be MIGrATION AFTEr MIDDLE-AGE into CICS that for

Biliary Mucinous Cystadenoma: A review of the Literature

在线全文

学校读者我要写书评

暂无评论

Journal of Clinical and Translational Hepatology 2019年第2期7卷 149-153页

作者： Leon D.Averbukh david C.Wu Woo Cheal Cho George Y.Wu Department of Medicine Division of Gastroenterology-HepatologyUniversity of Connecticut Health CenterFarmingtonCTUSA Department of Pathology Hartford HospitalHartfordCTUSA

Biliary mucinous cystadenomas are cystic neoplasms commonly mistaken for simple *** are rare and generally benign tumors,often incidentally found on imaging and during unrelated surgical *** tend to be slow growing though may reach symptomatic *** of biliary mucinous cystadenomas may have serious consequences secondary to their potential for malignant transformation into biliary mucinous ***,we review the epidemiology,etiology,pathology,diagnostic modalities,histology,and available treatment methods for mucinous cystadenomas reported in current literature.

关键词： Biliarymucinous cystadenoma Biliary mucinous cystadenocarcinoma Cystic neoplasm

Sports retail Sportswear Giants Jockey for Olympic Success

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

China International Business 2006年第10期 42-43页

作者： david HENDrICKSON

Spurred by favorable high-end market conditions, Nike and Adidas turn to competing Olympic strategies in the race for China＇s retail spoils

关键词：运动服中国奥运会阿迪达斯公司耐克公司

Dinosaurs of a Feather

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Bulletin of the Chinese Academy of Sciences 2010年第2期24卷 92-94页

作者： david Hone Institute of Vertebrate Paleontology and Paleoanthropology CAS

From the earliest days of paleontological research, the origin of birds was an area of special interest. Largely thanks to the work of Thomas Huxley and

关键词：恐龙羽毛鸟类起源古生物赫胥黎托马斯兽脚类候选人

在线全文

学校读者我要写书评

暂无评论

BELOW THE GAYDAr

The World of Chinese 2015年第5期 66-67页

作者： david DAWSON

Cautious strides for China’s gay and lesbian community in recent decades在美国,最高法院赋予同性恋婚姻合法地位,但在国情迥异的中国,同性恋这一特殊的群体还在争取亲友的理解和社会的认同,他(她)们还有很长的路要走On July 5,Li... 详细信息

Cautious strides for China’s gay and lesbian community in recent decades在美国,最高法院赋予同性恋婚姻合法地位,但在国情迥异的中国,同性恋这一特殊的群体还在争取亲友的理解和社会的认同,他(她)们还有很长的路要走On July 5,Li Maizi and her girlfriend Teresa Xu got *** wasn’t a large event,it had just a few dozen guests in attendance at the Beijing restaurant ***’s parents were not present.

关键词： BELOW THE GAYDAr

在线全文

学校读者我要写书评

暂无评论

Class in Session

China International Business 2006年第3期 I0006-I0006,I0008-I0009页

作者： david HENDrICKSON

China＇s insatiable demand for high-level business education is grabbing the attention of the global academic community and transforming how elite institutions do business. But will it last and to what end？

关键词：商业教育 MBA 中国 UIBE EMBA

FEAr AND LOATHING IN SAN FrANCISCO

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

The World of Chinese 2015年第6期 52-53页

作者： david DAWSON

Vice,faith,xenophobia,and success目睹过罪恶,聆听过福音,经历过排挤,见证过成功;百余年风云变幻,旧金山的唐人街从不缺少传奇San Francisco’s Chinatown may well be the largest outside of Asia,its success fueled in part by a ... 详细信息

关键词： FEAr AND LOATHING IN SAN FrANCISCO