检索结果-南通市图书馆

Journal of Chemistry and Chemical Engineering 2014年第3期8卷 278-285页

作者： birgit Elisabeth Swenson Chalmers Technical University Molnda143136 Sweden

Transportation of energy and substances is fundamental for the conditions of life. The energy from metabolised food is yielded at the reduction of oxygen by the assistance of Se-enzymes. Activated Se-enzymes contain an electron conducting Se-link with elemental Se bounded to Se-cys (Se-cystein) that prevents electron transferring (autoxidable) agents, as arginine, from oxidations. NO is formed from e. g. arginine during the passive state of a Se-enzyme. With NO, instead of O 2, bounded to a hem group, destroying oxidations are avoided. This is the role of NO. A nerve signal is activated by the GTP (guanosine triphosphate)-induced triggered transformation of cGMP (cyclic guanosine monophosphate) into GMP, closing the sodium channels. When GTP is consumed, the opposite reaction takes place. The direct influence of the GMP/cGMP quote on a nerve signal makes GMP/cGMP equal to EDHF (endothelium-derived hyperpolarizing factor). Part of the energy from food is stored and transported in the form of acetyl groups, building up many important molecules of which LDL (low density lipoprotein) is one, containing cholesteryl esters. These are brought in to the cell, decomposed to acetyl groups generating hydrogen, H, making LDL to an essential substance. High levels are connected to impaired energy yielding reactions, perhaps related to low levels of some substances, especially to one or both forms of Se. The necessity of a Se-link and NO induced protection against oxidations by reducible oxygen can no longer be neglected.

关键词：低密度脂蛋白 cGMP 硒酶 NO 连接硒半胱氨酸环磷酸鸟苷氧化反应

A Method and a Surface Treatment Agent for Preventing Biofouling on Surfaces under Water

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Chemistry and Chemical Engineering 2012年第3期6卷 227-232页

作者： birgit Elisabeth Swenson

This paper presents an environmentally friendly method of inhibiting biofouling especially acorn barnacles on surfaces under water by using nicotine and selenium in the form of Se(0), or such a substance which can be converted into them. Both of the substances are necessary to oxygen dependent organisms and will be used after conversion, but are toxic in high doses. By adding the substances to paint or other surface treatment agent which marine surfaces are treated with, organisms which are trying to establish themselves on the surfaces will be exposed to so high doses, the reactions which the settling is based on are disturbed. When the substances leak out into the seas, they will act as environment protectors, as they promote the development of organisms. Nicotine is transformed to nicotine amid which is the reactive part in NADH and one of the most important substances for the transference of hydrogen. Selenite is reduced to Se(0), also involved in the transport chain of hydrogen to reducible oxygen. However, large quantities Se(0) may disturb the reactions of sulphur by binding to it and impairing the formation of S-S-bridges.

关键词：表面处理剂生物污染水面物质形式环境功能尼古丁 NADH 生物体

塔里木河下游阿拉干断面胡杨树高的分布和密度

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

生态环境 2008年第3期17卷 1086-1090页

作者：蔡富艳玉米提·哈力克艾尔肯·艾白不拉阿布都米吉提·阿布力克木 Bodo Coenradie birgit Kleinschmit 新疆大学资源与环境科学学院新疆乌鲁木齐830046 新疆绿洲生态教育部重点实验室新疆乌鲁木齐830046 塔里木河流域管理局新疆库尔勒841000 中国科学院新疆生态与地理研究所新疆乌鲁木齐830011 德国柏林理工大学景观规划研究所德国柏林10623

通过小尺度生态监测与遥感数据分析获取塔里木河下游胡杨（Populus euphratica Oliv．）林现状信息，将胡杨个体对输水的响应实测数据和QuickBird影像信息进行对比和分析，“面”上宏观调查与“点”上典型研究相结合，集中对塔里木河下... 详细信息

通过小尺度生态监测与遥感数据分析获取塔里木河下游胡杨（Populus euphratica Oliv．）林现状信息，将胡杨个体对输水的响应实测数据和QuickBird影像信息进行对比和分析，“面”上宏观调查与“点”上典型研究相结合，集中对塔里木河下游阿拉干断面设立的100hm2长期监洲样方内的4500棵胡杨树进行了详细的调查。研究表明：胡杨密度随着离河岸距离增加而呈现降低的规律。不同树高的胡杨也呈一定规律分布。树高小于3m的幼树主要分布在距河道50m范围内；树高3-9m之间的胡杨在研究区中占绝对优势；树高大于9m的胡杨在距河道200m内分布比较均匀，200m之外分布稀少。

关键词：塔里木河下游生态输水胡杨树高密度结构

Pregnancy is not a risk factor for gallstone disease: Results of a randomly selected population sample

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2005年第43期11卷 6800-6806页

作者： Thomas Walcher Mark Martin Haenle Martina Kron birgit Hay Richard Andrew Mason Alexa Friederike Alice von Schmiesing Armin Imhof Wolfgang Koenig Peter Kern Bernhard Otto Boehm Wolfgang Kratzer Department of Internal Medicine Ⅰ Department of Biometry and Medical Documentation Department of Internal Medicine Ⅱ Department of Internal Medicine Ⅲ

AIM: To investigate the prevalence, risk factors, and selection of the study population for cholecystolithiasis in an urban population in Germany, in relation to our own findings and to the results in the international ***: A total of 2 147 persons (1 111 females,age 42.8±12.7 years; 1 036 males, age 42.3±13.1 years)participating in an investigation on the prevalence of Echinococcus multilocularis were studied for risk factors and prevalence of gallbladder stone *** factors were assessed by means of a standardized interview and calculation of body mass index (BMI). A diagnostic ultrasound examination of the gallbladder was performed. Data were analyzed by multiple logistic regression, using the SAS statistical software ***: Gallbladder stones were detected in 171study participants (8.0%, n = 2 147). Risk factors for the development of gallbladder stone disease included age, sex, BMI, and positive family history. In a separate analysis of female study participants, pregnancy (yes/no)and number of pregnancies did not exert any ***: Findings of the present study confirm that age, female sex, BMI, and positive family history are risk factors for the development of gallbladder stone disease. Pregnancy and the number of pregnancies,however, could not be shown to be risk factors. There seem to be no differences in the respective prevalence for gallbladder stone disease in urban and rural populations.

关键词：妊娠胆结石并发症治疗

Injections of Substances Inducing Apoptosis to Cancer Cells but Stimulation of Normal Cells May Prevent Cancer

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Chemistry and Chemical Engineering 2011年第5期5卷 393-403页

作者： birgit Elisabeth Swenson Tegelformsgatan 4 Moelnda143136 Sweden

Selenium(Se) compounds have prevented and Se-deficiency has induced the initiation of cancer. Se(0)-forming compounds and hydroxy-xanthones have killed cancer cells but shown beneficial effects to normal cells. They may together be effective in the treatment of cancer. Many enzymes which contain selenocysteine (Secys) can catalyze reactions with reducible oxygen (O2, O2 -, or H2O2). Experiments strongly support that Se-enzymes are activated by Se(0), from e. g. selenite, selenodiglutathione, binding to Se(-II) in Secys, forming an electron conducting Se-link to reducible oxygen as a protection against oxidations. Cancer cells, which are energy supported only from fermentation, are not dependent on Se which is why they are more sensitive to toxic effects of Se than normal cells. The energy from fermentation is insufficient for normal cell functions. High doses of Se(0)-containing compounds are toxic in that they form links with thiols (R?S?Se-) reducing their reaction rate. The reaction of an SH-enzyme, necessary in fermentation, is impaired. Mangostins (hydroxy-xanthones) induce apoptosis in human cancer cells but stimulate respiration. The OH-groups are responsible for the effects and the reduction of NADP+ into NADPH. Fermentation is inhibited as NADP+ is necessary for the process. Cancer may be treated by injections of Se(0)-forming compounds and hydroxy-xanthones into cancer cells in doses causing apoptosis. However, in diluted form, when meting normal cells, the substances promote the yield of energy by stimulating the electron transference to reducible oxygen. Se(0)-activated Se-links and hydrogen from hydroxy-xanthones hopefully prevent the initiation of cancer.

关键词：正常细胞诱导凋亡癌细胞癌症物质注射硒缺乏症氧杂蒽酮

集成化的一次性解决方案集成化一次性系统得到越来越多的关注

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

流程工业 2010年第3期 12-13页

作者： Christine Valle Paul Chapman Virginie lsner birgit Mohney Erica Saperstein 法国Molsheim市Millipore有限公司

一次性技术设备在多品种产品生产中具有节约成本，降低交叉污染风险，极大的使用灵活性等优点。而且集成化的一次性技术设备还满足了用户提出的与现有不断变化的生产工艺相匹配的要求。

关键词：一次性集成化系统技术设备节约成本产品生产污染风险生产工艺