检索结果-南通市图书馆

Biodegradation of Styrene-Butadiene-Styrene Coploymer via Sugars Attached to the Polymer Chain

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Advances in Materials Physics and Chemistry 2013年第2期3卷 112-118页

作者： Rakesh Singh Rishi Gupta Mukund G. Adsul Ramesh C. Kuhad Digambar V. Gokhale anjani J. Varma Department of Microbiology University of Delhi (South Campus) New Delhi India National Collection of Industrial Microorganisms Biochemical Sciences Division National Chemical Laboratory Pune India Polymer Science & Engineering Division National Chemical Laboratory Pune India

A synthetic method was developed to chemically attach few molecules of simple sugars like glucose, mannose, galactose, maltose and xylose (0.09 - 0.37 wt%) and with quaternary nitrogen pendants (0.42 - 0.46 atomic%) along the polybutadiene section of polystyrene-block-polybutadiene-block-polystyrene (SBS) block copolymer. These functionalized SBS copolymers were evaluated for biodegradation using the fungal culture Aspergillus niger NCIM 1025 (ATCC 9642) and bacterial culture Pseudomonas sp. NCIM 2220, and for antimicrobial properties using bacteria E. coli DH5α and Bacillus subtilis and yeasts Pichia stipitis NCIM 3497 and P. stipitis NCIM 3499. It was conclusively demonstrated that these modified SBS block copolymers were significantly more biodegradable than the unmodified SBS;the observed weight loss after biodegradation was ~4 - 14-fold for bacterial and ~7 - 36-fold for fungal cultures with respect to the sugar content of modified SBS. Preliminary studies on antimicrobial properties of these biodegradable polymers showed a 4% - 24% decrease in growth of the microorganisms E. coli and Bacillus subtilis studied.

关键词： Biodegradation Antimicrobial SBS Sugar Quaternary Nitrogen

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

国内电动汽车市场迎来动荡也许是好事

商业周刊（中文版） 2023年第5期 7-7页

作者： anjani Trivedi 邵璐宁(译) 不详

中国汽车制造商正在重蹈覆辙,这也许是件好事。伴随电动汽车侵蚀传统产品的市场份额,制造商正通过大力降价来吸引消费者。这看起来像是另一个萧条一提振一繁荣周期的开始:经历一段时间的需求低迷后,出台刺激购车的优惠措施,然后是(希望... 详细信息

中国汽车制造商正在重蹈覆辙,这也许是件好事。伴随电动汽车侵蚀传统产品的市场份额,制造商正通过大力降价来吸引消费者。这看起来像是另一个萧条一提振一繁荣周期的开始:经历一段时间的需求低迷后,出台刺激购车的优惠措施,然后是(希望看到的)销售激增。

关键词：电动汽车优惠措施汽车制造商市场份额消费者

Gastric intestinal metaplasia development in African American predominant United States population

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastrointestinal Endoscopy 2022年第10期14卷 597-607页

作者： Akram I Ahmad Arielle Lee Claire Caplan Colin Wikholm Ioannis Pothoulakis Zaynab Almothafer NishthaRaval Samantha Marshall Ankit Mishra Nicole Hodgins In Guk Kang Raymond K Chang Zachary Dailey Arvin Daneshmand anjani Kapadia Jae Hak Oh Brittney Rodriguez Abhinav Sehgal Matthew Sweeney Christopher B Swisher Daniel F Childers Corinne O'Connor Lynette M Sequeira Won Cho Department of Internal Medicine MedStar Washington Hospital CenterWashingtonDC 20010United States Department of Internal Medicine Georgetown University School of MedicineWashingtonDC 20007United States Department of Gastroenterology and Hepatology INOVA Medical SystemLeesburgVA 20176United States

BACKGROUND Gastric cancer significantly contributes to cancer mortality *** intestinal metaplasia(GIM)is a stage in the Correa cascade and a premalignant lesion of gastric *** natural history of GIM formation and progression over time is not fully ***,there are no clear guidelines on GIM surveillance or management in the United *** To investigate factors associated with GIM development over time in African American-predominant study *** This is a retrospective longitudinal study in a single tertiary hospital in Washington *** retrieved upper esophagogastroduodenoscopies(EGDs)with gastric biopsies from the pathology department database from January 2015 to December *** included in the study had undergone two or more EGDswith gastric *** with no GIM at baseline were followed up until they developed GIM or until the last available *** criteria consisted of patients age<18,pregnancy,previous diagnosis of gastric cancer,and missing data including pathology results or endoscopy *** study population was divided into two groups based on GIM *** and multivariate Cox regression was used to estimate the hazard induced by patient demographics,EGD findings,and Helicobacter pylori(***)status on the GIM *** Of 2375 patients who had at least 1 EGD with gastric biopsy,579 patients were included in the study.138 patients developed GIM during the study follow-up period of 1087 d on average,compared to 857 d in patients without GIM(P=0.247).The average age of GIM group was 64 years compared to 56 years in the non-GIM group(P<0.001).In the GIM group,adding one year to the age increases the risk for GIM formation by 4%(P<0.001).Over time,African Americans,Hispanic,and other ethnicities/races had an increased risk of GIM compared to Caucasians with a hazard ratio(HR)of 2.12(1.16,3.87),2.79(1.09,7.13),and 3.19(1.5,6.76)*** gender difference was obse

关键词： Gastric intestinal metaplasia Gastric cancer Helicobacter pylori Retrospective longitudinal study Esophagogastroduodenoscopy African American population

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

美国想发展绿色产业离不开中国

商业周刊（中文版） 2022年第16期 7-7页

作者： anjani Trivedi 邵璐宁(译) 不详

美国的电动汽车产业政策可能让全球电动汽车电池制造商陷入焦虑。8月签署生效的《通胀削减法案》(IRA)旨在改革电动汽车的税收减免政策,确保电池组和电动汽车的最终组装在北美进行,同时将中国电池材料排除在供应链之外。为实现上述目标... 详细信息

美国的电动汽车产业政策可能让全球电动汽车电池制造商陷入焦虑。8月签署生效的《通胀削减法案》(IRA)旨在改革电动汽车的税收减免政策,确保电池组和电动汽车的最终组装在北美进行,同时将中国电池材料排除在供应链之外。为实现上述目标,该法案从供需两方面着手,既颁布新的激励措施,鼓励发展国内先进制造业,同时也修改了针对买方的现行激励政策。

关键词：税收减免政策先进制造业激励措施供应链电动汽车电池材料绿色产业激励政策