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Search Results: 1 - 10 of 569 matches for " selenium "
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基于车型认证系统的自动化测试设计与实现
The Design and Implement of the Automation Test Based on Vehicle Certification System
 [PDF]

庄恒国, 国建胜, 邵学彬
Software Engineering and Applications (SEA) , 2016, DOI: 10.12677/SEA.2016.55031
Abstract:
随着信息化步伐不断加快,软件作为处理业务和提供服务的重要保障,其开发任务日趋繁重,各类管理软件也变得越来越庞大和复杂,这就对软件测试提出了更高的要求。为了节省大量的时间和开支,必须使用自动化测试技术代替效率低下的手工测试,节省软件测试成本,缩短产品发布周期[1]。Selenium是众多功能自动化测试工具中较为成熟的一个产品。当集成了WebDriver API,进入了Selenium 2.0时代后,其能力和影响力得到极大增强。本文研究了基于Selenium 2.0的自动化测试技术,对TestNg (Testing Next Generation)框架进行封装,并结合汽车行业软件申报零件多且重复性高的特点,在实际汽车软件平台中加以应用,不仅提升了软件测试工作的积累和复用度,而且有效保障了系统升级过程中的持续稳定性。
With the accelerating pace of the information technology, as the important guarantee for handling business and providing service, the development tasks of software are becoming increasingly arduous. All kinds of management software have become increasingly complex, which puts forward higher requirements for software testing. In order to save time and expenses, we must use automated testing technology instead of inefficient manual testing for saving software testing costs and shortening the release cycle of the product. Selenium is relatively mature in the automated testing tools. Especially after Selenium 2.0, the integration of Webdriver API significantly enhances its performance. Based on the software in the automotive sectors, this paper applies Selenium 2.0 to it with TestNg (Testing Next Generation) framework, which not only enhances the reusability and efficiency, but also improves the stability and reliability during system updating.
Functions of essential nutrition for high quality spermatogenesis  [PDF]
Yunsang Cheah, Wanxi Yang
Advances in Bioscience and Biotechnology (ABB) , 2011, DOI: 10.4236/abb.2011.24029
Abstract: The process of sperm production is well understood, but the studies of essential nutritional elements which are necessary for successful spermatogenesis are not deeply studied as yet. Our review focuses on integrating available information of various nutritional elements involved in spermatogenesis, sperm maturation and male reproductive system development, such as Zinc, Selenium, Folate, Vitamins and others. Antioxidants protect sperm from further oxidative damage during the entire sperm production. Other nutrients assist to improve sperm quality through different ways. The important roles of macronutrients like lipids, amino acids and proteins are emphasized here. These macronutrients constitute major components of the spermatozoa. Effects of nutritional elements on the development of Sertoli cells and Leydig cells, sperm motility and semen quality, capacity of capacitation and fertilization are discussed. A review of these areas will provide researchers with a better understanding of the compulsory participation of these nutrients in male reproductive processes. This review also pointed out gaps in current studies which will require further investigations.
The Effect of Selenium and Lycopene on Oxidative Stress in Bone Tissue in Rats Exposed to Cadmium  [PDF]
Tarfa Al Ibrahim, Hamza Abu Tarboush, Ahmad Aljada, Mai Al Mohanna
Food and Nutrition Sciences (FNS) , 2014, DOI: 10.4236/fns.2014.514155
Abstract:

This study examined the effect of selenium (Se) or lycopene (Lyc) and their combination on oxidative stress in bone following cadmium (Cd) exposure in vivo. Cd exposure enhanced accumulation of Cd in femur with subsequent increase in LPO and PC and decreased antioxidative enzyme activities in rat femur, along with significant decreases in body and femur bone weights. Subcutaneous (s.c.) injection of Se or Lyc reduced Cd accumulation in bone and increased body and femur weights,when given individually or concomitantly. Antioxidant enzyme activities maintained and/or increased following Se and Lyc supplementation when given individually or concomitantly. However, lycopene dose of 10 mg/kg of body weight alone or selenium alone provided better protection to bone tissues of rats against oxidative stress compared to treatment with their combination. Selenium and lycopene could be used as a dietary supplement to protect against bone oxidative stress in areas exposed to Cd pollution.

Effects of Inclusion of Polyunsaturated Fatty Acids and Antioxidants on Spermatozoa Morphology of Potchefstroom Koekoek Cockerels  [PDF]
Caiphus Hlungwani, Francois K. Siebrits, Tshimangadzo L. Nedambale
Open Journal of Animal Sciences (OJAS) , 2015, DOI: 10.4236/ojas.2015.52018
Abstract: This study was conducted to determine the effects of increasing dietary polyunsaturated fatty acids (PUFA) and antioxidants (Se and vitamin E) on spermatozoa morphology. At 24 weeks of age, Potchefstroom Koekoek cockerels (n = 60) were selected from the base population. Cockerels were randomly allocated into five dietary treatments with 12 cockerels per dietary treatment. The diets consisted of commercial layer diet (CL), commercial cockerel diet (CC), modified layer diet (ML), modified layer diet +PUFA (MLP), and modified layer +PUFA+ antioxidants (MLPA) diet. At 36 weeks of age, six cockerels with ≥ 75% sperm motility rate following analysis by Computer Aided Sperm Analysis (CASA) were selected from the base population in each dietary treatment group. Semen volume, sperm cells concentration and dead cells did not differ significantly among any of the groups. However, live and normal spermatozoa were significantly higher in the MLPA group. The bent mid-piece, bent mid-piece plus droplets, proximal droplets and distal droplets were significantly lower in the MLPA group. From this study it can be concluded that supplementation of polyunsaturated fatty acids and antioxidants may be of vital importance for normal morphology characteristics of spermatozoa in Potchefstroom Koekoek cockerels.
A Novel Process For Recovery Of Te And Se From Copper Slimes Autoclave Leach Solution  [PDF]
Shijie Wang, Brad Wesstrom, Jean Fernandez
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2003, DOI: 10.4236/jmmce.2003.21005
Abstract: In pressure oxidation leaching of copper anode slimes, more than 65% of the tellurium is co-extracted during decopperizing. About 10 – 15% of the selenium is also dissolved imultaneously by severe leach conditions. Current operation for the treatment of the leachate is to constantly recirculate the leach solution through a bed of copper turnings. The tellurium and selenium are precipitated from the leach liquor as copper telluride and copper selenide and separated from the solution by filtration. In order to improve the reaction efficiency and reduce the process cost, viz. minimize the copper addition, cut retention time, and reduce the energy consumption; a chemical reducing agent is studied and the cementation process tested in the laboratory. In this paper, the test results are presented and the process chemistry is discussed.
Selenium and plants
Mateja Germ , Vekoslava Stibilj
Acta agriculturae Slovenica , 2007, DOI: 10.2478/v10014-007-0008-8
Abstract: Selenium is of metabolic importance in cyanobacteria and in some plants, being involved in their antioxidative processes. Selenium is widely distributed on the Earth's surface and available for plants in at least small traces. Cultivation of plants enriched with selenium could be an effective way of producing selenium rich foodstuffs and thereby increase health benefits. The essentiality of selenium to higher plants is still under debate. Selenium can increase the tolerance of plants to UV-induced oxidative stress, delay senescence, and promote the growth of ageing seedlings. Recently it has been shown that selenium has the ability to regulate the water status of plants under conditions of drought. The distribution and speciation of selenium in plants and the effect of selenium alone and in combination with some other environmental parameters is discussed.
Tiroid ve Selenyum - Olgu Sunumu
Ilg?n Y?ld?r?m ?im?ir,Ahmet G?khan ?zgen
Turkish Journal of Endocrinology and Metabolism , 2010,
Abstract: Selenium, which is toxic in high concentrations, is essential for the body. This trace element known for its antioxidant function is the cofactor of many enzymes. Selenium plays a role in many metabolic processes involving the enzymes glutathion peroxidases, deiodinases, thioredoxin reductases, and selenoprotein P that protect the organism from oxidative damages in humans. Selenium as a trace element plays role both structurally and as cofactor in the regulation of inflammatory processes, immune and endocrine functions. It has been shown that selenium may be a protector against some cancer types, increases male fertility, reduces cardiovascular mortality, and represses formation of inflammatory mediators in asthma. In first research studies, selenium drew attention with its anti-carcinogenic effects. Afterwards, its effects on thyroid hormone were started to be investigated in 1990s. As the studies on selenium increase, among the questions that frequently arise is whether to give selenium supplementation to healthy persons and patients with known thyroid pathology, especially to pregnant women, beside the iodine supplementation that has been used for a long time in the world and Turkey. In order to be able to give better answers to these questions, we tried to analyze the articles including selenium treatment related to thyroid disorders in the literature. Turk Jem 2010; 14: 76-9
Selenium: from health to the biological food chain
Elizabeth Williams,Melinda Harrison
Journal of Biotech Research , 2010,
Abstract: Selenium is an essential trace element which plays a role in the anti-oxidant activity in the cell. Selenium homeostasis needs to be strictly regulated as it can be harmful in excess or limiting amounts. Selenium has been studied extensively in its incorporation into seleneocysteine and subsequently seleneoproteins have been found in species ranging from algae to humans. Here within, a detailed review follows of selenium uptake within the human body and pathogenic implications. Also selenium toxicity will be examined in other organisms as well as its importance in biowebs and its role in the food chain. Lastly, the pathways of selenium in the cells will be discussed as well as future directions.
Selenium profile in blood plasma of grazing sheep: A case study in specific ranch in Punjab, Pakistan  [PDF]
Zafar Iqbal Khan, Kafeel Ahmad, Muhammad Danish, Muhammad Aslam Mirza, Farhad Mirzaei
Agricultural Sciences (AS) , 2012, DOI: 10.4236/as.2012.34055
Abstract: A survey was conducted in Southwestern, Punjab, Pakistan during two different seasons to assess the status of selenium of three different classes of grazing sheep. Blood plasma from lactating, non-lactating and male sheep were collected four times monthly in winter and summer seasons and analyzed for selenium concentration. Seasonal variations were found for plasma selenium concentration. Selenium concentration of plasma was higher in male sheep than those lactating and non lactating ewes during both the seasons as well as it were higher compared to the established critical value for blood plasma selenium for these ruminants. High incidence of deficiencies was found particularly for lactating ewes. These deficiencies in plasma selenium based on critical level were 35% to 15 % for lactating, 28% to 12% for non lactating ewes and 15% to 5% for male animals during winter and summer seasons, respectively. Although some differences among the three classes of sheep were found for selenium concentrations of blood plasma, but dramatic class differences could not be concluded based on this study. It was suggested based on the results obtained, pellets, glass bolus or mixture that contain selenium, should be used for supplementation for grazing sheep in the study area to maintain the plasma Se at optimum required level for the prevention of complication in livestock caused due to deficiency of this element.
Selenium Content in Blood of Donors from the North of Rio de Janeiro State, Brazil  [PDF]
Jaqueline Batista Silva, Karla Silva Ferreira, Selma Bergara Almeida, Laura Pessanha Duarte
Food and Nutrition Sciences (FNS) , 2012, DOI: 10.4236/fns.2012.39157
Abstract: Selenium is an element which participates in antioxidant enzymes. A medium and long term lack of such element is associated, mainly, with heart disease, joint and bone structure problems and thyroid activity. Selenium contents in blood reflect its ingestion and food content variation. It depends on soil characteristics, such as pH and selenium presence. There are few studies concerning selenium levels in food and blood in Brazil. Therefore, the objective of this research was to determine selenium content in a blood donor group in Rio de Janeiro state, conducted from December 2008 to March 2009. From the donated blood to Regional Blood Center of Campos dos Goytacazes, 4.0 mL were submitted to selenium analysis through atomic absorption spectrometry of hydride generation and organic matter oxidation wet basis with nitric and perchloric acid. Selenium content varied from 75 ± 16 ng·g-1 for females and 70 ± 21 ng·g-1 for males. There was no significant difference among selenium contents in blood from donors of different gender, age and residence. Seventy four percent of donors had selenium content in blood below 70 ng·mL-1, the lowest level for maximum selenoproteins production, according to the Nutritional Prevention Cancer.
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