Identifiers are stored to count the number of visits, access dates, geographic location, among other statistical functions. Therefore, a diet rich in foods that contain lots of selenium is adequate for healing of wounds, cuts, burns, and to increase defenses in general. Physical properties Selenium exists in a number of allotropic forms. Technical cookie. Selenium - Affinity - Electronegativity - Ionization Energy. Most of the Selenium isotopes have been used in studies into the role of Selenium as an essential nutrient. Le sélénium aurait également une incidence sur : 1. le bon fonctionnement de la thyroïde ; 2. l'élimination des métaux lourds du corps ; 3. l'eczéma ; 4. les troubles hépatiques ; 5. les rhumatismes. It is a nonmetal (more rarely considered a metalloid) with properties that are intermediate between the elements above and below in the periodic table, sulfur and tellurium, and also has similarities to arsenic. The revitalizing properties of selenium are sometimes used to treat gray hair. The double-helix structure, characterized by high-resolution transmission electron microscopy and X-ray diffraction, is completely different from the bulk atomic arrangement and may be considered a new structural phase of Se. There are many options through which Selenium can be used. The main producing countries are Canada, USA, Bolivia and Russia. Selenium uptake through food may be higher than usual in many cases, because in the past many selenium-rich fertilizers have been applied on farmland. Food usually contains enough selenium to prevent disease caused by shortages. Selenium exposure takes place either through food or water, or when we come in contact with soil or air that contains high concentrations of selenium. These properties make selenium useful in the production of photocells and exposure meters for photographic use, as well as solar cells. Selenium is among the rarer elements on the surface of this planet, and is rarer than silver. There are various allotropic forms of selenium, that interconvert into each other with varying temperature. People that eat a lot of grains that grow near industrial sites may experience a higher exposure to selenium through food. When the exposure is extremely high, collection of fluid in the lungs and bronchitis may occur. Selenium is mostly noted for its important chemical properties, especially those dealing with electricity. Let us now see how to get text of an element in Selenium using parallel tests. Nanotechnology has introduced nanoparticulate form of selenium for a wide variety of applications. Properties of Selenium Image will be added soon. First Ionization Energy of Selenium is 9.7524 eV. Similarly, there are some selenium contraindications and side effects that should be considered. It is found as solid at 20 ℃ temperature. Selenium is present in the atmosphere as metyl derivatives. Conclusion – Uses of Selenium. Selenium to prevent infections, aging and cancer. Other uses of selenium are in metal alloys such as the lead plates used in storage batteries and in rectifiers to convert AC current in DC current. Allotropes are forms of an element with different physical and chemical properties. Keywords You can withdraw your consent or cancel the data processing at any time by clicking on "More information" or visiting our Cookie Policy. The third min use, taking about 15% is sodium selenite for animal feeds and food supplements. The information is always anonymous. Most people get enough of this essential mineral from foods, and taking too much may lead to health problems. Introduction. What's this What is selenium? Se NPs have weak anti-tumor effects before functionalization. Selenium is a powerful zeitgeber – a cue that synchronizes your internal clock to the natural 24-hour light/dark cycles of the Earth (zeit=time, geber=giver). Click to read the privacy policy Google, Inc. Selenium helps restore an imbalanced circadian rhythm, which often affects people with insomnia. The behaviour of selenium in the environment strongly depends upon its interactions with other compounds and the environmental conditions at a certain location at a certain time. Compare Bromine and Selenium on the basis of their properties, attributes and periodic table facts. This table has links to all the properties of selenium included within WebElements. Implementing Selenium getAttribute() In LambdaTest Grid Cloud. Thus, it does not only manages to keep the muscles and tendons in better shape, for the body to retain agility for longer, but it also delays the havoc aging causes on the skin, manifested in the form of wrinkles, blemishes, crow’s feet, sagging and other imperfections that make us look older. Technical cookie. Selenium can also be used to reduce the transmission of sunlight in architectural glass, giving it a bronze tint. This is not very surprising, because selenium occurs naturally in the environment extensively and it is very widespread. Retrouvez Some experiments on the physical properties of selenium with a theoretical discussion based on the electron theory, by Patrick Joseph Nicholson, dissertation et des millions de livres en stock sur Amazon.fr. Boiling point of selenium is 685 ℃. People that live near hazardous waste-sites will experience a higher exposure through soil and air. Generates random alphanumeric data to protect the website by detecting and mitigating malicious activities. Exposure to selenium through drinking water may be increased when selenium from hazardous waste disposals ends up in water wells. Up to date, curated data provided by Mathematica's ElementData function from Wolfram Research, Inc. The main symptoms that indicate a lack of selenium are: – Increased susceptibility to food poisoning, – Increased susceptibility to chemical poisoning. Physical state @ 20°C: Solid [4] Color: Vitreous amorphous form: dark red to bluish-black [5] In Selenium .properties files are mainly used to store GUI locators / elements, and also Global fields like database configuration details '.properties' files are mainly used in Java programs to maintain project configuration data, database config or project settings etc. Selenium exists in an amorphous powder form in chemical reactions. What is setProperty in Selenium? Next, we will see how we can leverage LambdaTest’s Selenium Grid cloud to run tests in parallel and get the test results by a single execution. People that work in metal industries, selenium-recovery industries and paint industries also tend to experience a higher selenium exposure, mainly through breathing. In the present study, we prepared Ferulic Acid (FA)-modified selenium nanoparticles in a facile synthetic approach. The rejuvenating effects of selenium have been used in the treatment of other conditions such as chronic fatigue syndrome, depression or lack of courage. When shortages occur people may experience heart and muscle problems. We cannot access the data stored in the cookies of other websites when you browse the aforementioned websites. Each browser has a different configuration. What is Selenium - Chemical Properties of Selenium - Symbol Se. A lump of clay is an example of an amorphous material. Higher oxygen levels and increased acidity of soils is usually cause by human activities, such as industrial and agricultural processes. Acceptance of the section notice (language according to the visitor's browser). Electron affinity of Selenium is 195 kJ/mol. It’s a non-metallic chemical element which is a member of the group 16 … Selenium burns in air and is uneffected by water, but dissolv… Its symbol is Se and belongs to the group of nonmetals and its habitual state in nature is solid. Its deficit may cause acute disorders, but an overdose can also lead to severe consequences. It can cause dizziness, fatigue and irritations of the mucous membranes. Selenium is released to air through coal and oil combustion. Selenium offers a getText() method used to get the text of an element, i.e. In men, selenium is important for producing sperm and testosterone. Selenium is a member of the sulfur group of nonmetallic elements and is similar to this element in terms of its forms and compounds. Selenium nanoparticles (Se 0 NPs) have been well-characterized; however, whether processing affects their physicochemical and functional properties remains unknown. Synthesis of selenium QDs using laser induced melting/vaporization of water suspended selenium NPs of larger size and studies of their irradiation time or size dependent optical properties are subjects of current investigation. Cancer-protective properties of high-selenium broccoli. The health effects of various forms of selenium can vary from brittle hair and deformed nails, to rashes, heat, swelling of the skin and severe pains. Atomic Number of Selenium . Normally we use a selenium dose of 200 mcg daily with thyroid hormones to supplement the lack of natural hormone. Specific Heat: Value given for solid hexagonal form. Usually this bio magnification of selenium starts when animals eat a lot of plants that have been absorbing large amounts of selenium, prior to digestion. The RDA depends, as we can see, on age and sex. Selenium is a photoconductor, which means it has the ability to change light energy into electrical energy. properties.getProperty(“driverPath”):Properties object gives us a .getProperty method which takes the Key of the property as a parameter and return the Value of the matched key from the .properties file. Some of these toxins can be absorbed through food, contaminated water or the air we breathe. It has been proven that people who have low levels of selenium are more likely to get sick. Selenium is a non metallic chemical element, member of the group XVI of the periodic table. In other words, these factors determine its mobility. Global industrial production of selenium is around 1500 tonnes a year and about 150 tonnes of selenium are recycled from industrial waste an reclaimed from old photocopiers. Grey allotropic form of seleni… Selenium is most likely to enter the air through coal and oil combustion, as selenium dioxide. Third-party cookies: those that are sent to the browser or device and are managed by third parties. Pregnant or lactating women need an extra amount. To establish levels of protection for users against cyber attacks. Selenium that is immobile and will not dissolve in water is less of a risk for organisms. Carcinogenicity- The International Agency for Research on Cancer (IARC) has listed selenium within Group 3 (The agent is not classifiable as to its carcinogenicity to humans.). Achetez neuf ou d'occasion When animals absorb or accumulate extremely high concentrations of selenium it can cause reproductive failure and birth defects. Selenium has good photovoltaic and photoconductive properties, and it is used extensively in electronics, such as photocells, light meters and solar cells. Selenium is used to improve the abrasion resistance in vulcanized rubbers. Phone: +971 4 429 5853 e-mail: info@lenntech.com, Copyright © 1998-2020 Lenntech B.V. All rights reserved, Plant Inspection & Process Optimalisation, Separation and Concentration Purification Request. When selenium is more mobile, the chances of exposure to its compounds will be greatly enhanced. – Anticancer: Selenium is a good protection against the development of cancer cells. The exposure to selenium mainly takes place through food, because selenium is naturally present in grains, cereals and meat. Due to irrigation run-off concentrations of selenium tend to be very high in aquatic organisms in many areas. Antioxidants protect cells from damage. Selenium is a chemical element that is placed in the oxygen group of the periodic table. The radioprotective properties of selenium-containing substances were examined in rats that were x-rayed with different doses. This article explains the setProperty method in Selenium with a sample program. One allotrope of selenium is an amorphous red powder. Related to the advertising displayed on the website. Cookies are text files that browsers or devices generate when visiting Internet websites. Overexposure may result in red staining of the nails, teeth and hair. Moreover, selenium compounds as chemotherapeutic agents usually are used at supranutritional doses. Uncombined selenium is occasionally found and there are around 40 known selenium-conaining minerals, some of which can have as much as 30% selenium - but all are rare and generally they occur together with sulfides of metals such as copper, zinc and lead. The selenium is a micronutrient trace element, the antioxidant effect is chiefly due to the selenoenzymes such as thioredoxin reductase (TR) and glutathione peroxidase family (GPxs) which is having ROS scavenging activity. Compare elements on more than 90 properties. Selenium is an element with the atomic number 34. Navigate to the LambdaTest website. red selenium has here sub-forms, alpha, beta and gamma. Selenium is … Below is a table with identification of the most relevant cookies used on this website and their purpose: You can restrict, block or delete Botanical-online cookies, or any other website, using your Internet browser. Physical properties Selenium exists in a number of allotropic forms. More studies are needed to evaluate the immune-stimulating properties of selenium. The biggest use of selenium is as an additive to glass. Specific heat of Selenium is 0.32 J/g K. Latent Heat of Fusion of Selenium is 6.694 kJ/mol. – Increases immunity: We must also take into account that selenium helps the immune system, increasing the defenses and protecting the body against infectious diseases. Selenium occurs naturally in the environment. Selenium anti-inflammatory properties are due to the role that this component plays in the production of the enzyme glutathione peroxidase. Finley JW, Ip C, Lisk DJ, et al. This element is rare and composed of 90 parts per billion of the Earth crust. The amount of selenium in different foods depends on the amount of selenium in the soil where the food was grown. Supplementation of vitamin E and selenium can be very good for the treatment of inflammatory diseases such as rheumatoid arthritis and lupus, two diseases in which the affected patients generally exhibit low levels of selenium. Soil temperatures, moisture, concentrations of water-soluble selenium, the season of the year, organic matter content and microbial activity determine how fast selenium will move through soil. Physical-electrical properties The most outstanding physical property of crystalline selenium is its photoconductivity: on illumination, the electrical conductivity increases more than 1,000-fold. Noté /5. Se-76 can be used for the production of the medical isotopes Br-75 and Br-76. The antioxidant action of selenium is carried out in combination with vitamin E. Thus, selenium protects us against free radicals, … It was found that the selenium - containing substance, used either separately or in the combination with the E and A vitamins, possessed radioprotective properties. It was discovered by Jons J. Berzelius in 1817. In a randomized controlled trial featuring sixty patients with diabetic nephropathy, selenium supplementation significantly increased blood levels of antioxidants such as glutathione ( 18 ). The antioxidant action of selenium is carried out in combination with vitamin E. Thus, selenium protects us against free radicals, retarding aging, and preventing the appearance of many degenerative diseases. This action neutralizes the formation of dandruff and reduces hair itching. Allotropes are forms of an element with different physical and chemical properties. The oxygen levels in the soil and the acidity of the soil will increase mobile forms of selenium. A lump of clay is an example of an amorphous material. Unlike sulfur, selenium is a semiconductor, meaning that it conducts some electricity, but not as well as conductors. Selenium has antioxidant properties and may help protect cells from damage. The process of improving blood circulation prevents against the emergence of many cardiovascular diseases, including hypertension, myocardial infarction, angina or stroke. These tools never obtain your personal data such as data about your name or surnames, or the postal address from where you connect, or credit card, among others. Due to exceptional catalytic, photoreactive, biocidal, anticancer, and antioxidant properties, selenium nanoparticles (SeNPs) attract considerable interest for use in antimicrobial coatings, nutritional supplements, nanotherapeutics, diagnostics, and medical devices, as well as in … Among various inorganic nanoparticles, the Se can be extensively exploited due to its unique antioxidant properties. To ensure that the website can function correctly. They are used to store information about the visit and meet the following requirements: Cookies are associated with an anonymous user only. J Agric Food Chem 2001;49:2679-83. Distributieweg 3 2645 EG Delfgauw The Netherlands Phone: +31 152 610 900 fax: +31 152 616 289 e-mail: info@lenntech.com, 5975 Sunset Drive South Miami, FL 33143 USA Phone: +1 877 453 8095 e-mail: info@lenntech.com, Level 5 - OFFICE #8-One JLT Tower Jumeirah Lake Towers Dubai - U.A.E. They are the cookies of the Google Analytics. Humans need to absorb certain amounts of selenium daily, in order to maintain good health. Follow the "Link to definition of property" or "Link to data for property" of the element selenium. Electronegativity of Selenium is 2.55. Generated by Google services (for example reCaptcha, Youtube, search. This last form conducts electricity better in the light than in the dark and is used in photocells. Compare elements on more than 90 properties. Low levels of selenium can end up in soils or water through weathering of rocks. Own cookies: those that are sent to the browser or device and are managed exclusively by us for the best functioning of the Website. In chemical activity and physical properties it resembles sulfur and tellurium. Related to the analytical or statistical function of the site traffic. Properties: Selenium has an atomic radius of 117 pm, a melting point of 220.5°C, boiling point of 685°C, with oxidation states of 6, 4, and -2. Selenium has antioxidant properties, and research shows that the mineral may help improve immune response. Se-74 is used for the production of Se-75 which is used as a source in gamma radiography. Rain, evaporation, pesticides, and pH levels can all affect selenium levels in soil. Amorphous means "without crystalline shape." Selenium nanoparticles (Se NPs) attract a lot of attention as potential cancer therapeutic agents. Abstract. Black selenium is converted to grey selenium when temperature is increased to around 180°C. Selenium is a metallic gray chemical element with an atomic number of 34. Photo of foods high in selenium: nuts, legumes and whole grains. One allotrope of selenium is an amorphous red powder. Humans may be exposed to selenium in several different ways. We pay special attention to antioxidant activities of selenium compounds, especially selenoproteins, and their importance in antioxidant defence. Botanical-online, like most other websites on the Internet, uses its own and third-party cookies to improve the user experience and to offer an accessible and adapted browsing. – Detoxifying: Selenium is able to neutralize the toxic effect of many heavy elements such as lead, cadmium, mercury, etc.. Compare Bromine and Selenium on the basis of their properties, attributes and periodic table facts. The data they keep is of a technical nature. They are managed by Google DoubleClick. The functions of selenium in the organism are mainly connected with its antioxidant properties, as it is an essential part of im … ©1999-2020 Botanical-Online SL - All rights reserved. Selenium appearsin a number of allotropic forms: the most popular are a red amorphous powder, a red crystalline material, and a gray crystalline metallike form called metallic selenium. It is worth noting, that data on selenium anticancer properties is still contraversive. View abstract. At any time it is possible to access the browser settings to modify and / or block the installation of cookies sent, without preventing access to the content. Properties of Selenium Moss, Richard J. Abstract. Achetez neuf ou d'occasion Burns in contact with air but is unaffected by water. All the elements of similar categories show a lot of similarities and differences in their chemical, atomic, physical properties and uses. This phenomenon causes selenium to end up in local drinking water, so that exposure to selenium through water will be temporarily increased. Selenium levels in soils and waters increase, because selenium settles from air and selenium from waste also tends to end up in the soils of disposal sites. Although it has not been proven effective to combat already developed cancers, selenium is often used in the treatment of lung, skin, prostate and stomach cancers. A second allotrope of selenium has a bluish, metallic appearance. Technical cookie. – A very antioxidant mineral: Selenium has stimulatory functions to enzymes with a large cellular antioxidant and protective effect against external pathogens. To offer personalized advertising content. Selenium Web Driver Object repository using Properties file In this approach, properties file is a text file wherein data is stored on the form of key-value pairs. Overexposure of selenium fumes may produce accumulation of fluid in the lungs, garlic breath, bronchitis, pneumonitis, bronchial asthma, nausea, chills, fever, headache, sore throat, shortness of breath, conjunctivitis, vomiting, abdominal pain, diarrhea and enlarged liver. We now know how we can use the Selenium getAttribute() method to fetch web element properties. Selenium uptake through food is usually high enough to meet human needs; shortages rarely occur. Notes on the properties of Selenium: Melting Point: Value given for hexagonal, gray form. Selenium, basic physical and chemical properties of the element. Selenium—from Ancient Greek σελήνη (selḗnē) "Moon" – was discovered in 1817 by Jöns Jacob Berzelius, who noted the similarity of the new element … Selenium substances in air are usually broken down to selenium and water fairly quickly, so that they are not dangerous to the health of organisms. And when subjected to rapid melting, selenium acquires a black glass like allotropic form. Selenium from hazardous waste-sites and from farmland will end up in groundwater or surface water through irrigation. Selenium is a non-metal and is sometimes considered as a metalloid.

properties of selenium

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