Basically, selenium-containing compounds are found in nature in the form of selenium-containing amino acids such as methylselenocysteine, selenocysteine, and selenomethionine are present in traces in various vegetables and germinated seeds. It is a nonmetal with properties that are intermediate between those of its periodic table column-adjacent chalcogen elements sulfur and … It is found as solid at 20 ℃ temperature. This mineral is capable of protecting the eye against destructive oxidation factor preventing the appearance of eye problems such as cataracts, loss of vision or night blindness. These similarities and dissimilarities should be known while we study periodic table elements. Selenium - Specific Heat Capacity - Latent Heat of Vaporization and Fusion. Also this diet will protect us from diseases like flu, cold, etc.. – Aging: The ability of selenium to enable people to maintain a more youthful appearance is attributed to the power of this mineral to repair damaged tissue and its ability to keep the skin smooth. Discovered accidentally, selenium has many properties that allow it to be used for biological and electrical purposes. Exposure to selenium through drinking water may be increased when selenium from hazardous waste disposals ends up in water wells. Selenium is one of several nutrients known to have antioxidant properties, meaning selenium plays a part in chemical reactions that stop free … Use Case. We now know how we can use the Selenium getAttribute() method to fetch web element properties. The seriousness of these effects depends upon the concentrations of selenium in the food and how often this food is eaten. The rejuvenating effects of selenium have been used in the treatment of other conditions such as chronic fatigue syndrome, depression or lack of courage. Selenium is a member of the sulfur group of nonmetallic elements and is similar to this element in terms of its forms and compounds. "Botanical" is not responsible for damages caused by self-medication. It is worth noting, that data on selenium anticancer properties is still contraversive. Allotropes and Physical Properties Selenium can exist in multiple allotropes that are essentially different molecular forms of an element with varying physical properties. To offer personalized advertising content. What's this What is selenium? Selenium to prevent infections, aging and cancer. It has been proven that people who have low levels of selenium are more likely to get sick. They collect information about the displayed advertisements, help to improve and correctly manage the display of advertisements on the web service. Follow the "Link to definition of property" or "Link to data for property" of the element selenium. – A very antioxidant mineral: Selenium has stimulatory functions to enzymes with a large cellular antioxidant and protective effect against external pathogens. Photo of foods high in selenium: nuts, legumes and whole grains. Balanced selenium levels are important for reproductive health in both men and women. 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. Botanical-online team in charge of content writing, windows.microsoft.com/es-xl/internet-explorer/delete-manage-cookies#ie="ie-10", support.microsoft.com/es-es/help/4468242/microsoft-edge-browsing-data-and-privacy-microsoft-privacy, support.mozilla.org/es/kb/Borrar%20cookies, support.google.com/chrome/answer/95647?hl="es". Selenium is among the rarer elements on the surface of this planet, and is rarer than silver. When the exposure is extremely high, collection of fluid in the lungs and bronchitis may occur. The stored data are technical and, in no case, personal information to identify the navigator. The oxygen levels in the soil and the acidity of the soil will increase mobile forms of selenium. Achetez neuf ou d'occasion First Ionization Energy of Selenium is 9.7524 eV. For example, one allotrope of selenium can be seen as an amphorous (“without crystalline shape”) red powder. When selenium uptake is too high health effects will be likely to come about. Cancer-protective properties of high-selenium broccoli. When shortages occur people may experience heart and muscle problems. Selenium is a non metallic chemical element, member of the group XVI of the periodic table. 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. This antioxidant helps lower oxidative stress in your body, which reduces inflammation and enhances immunity. 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. Selenium atoms have 34 electrons and the shell structure is 2.8.18.6. You can read more information in the Privacy Policy. Selenium can also find applications in photocopying, in the toning of photographs. Related to the analytical or statistical function of the site traffic. We elaborate the uses of Selenium and atomic properties with characteristics. Specific Heat: Value given for solid hexagonal form. Technical cookie. Achetez neuf ou d'occasion Allotropes are forms of an element with different physical and chemical properties. It is combined with the physical properties of elements like tellurium and sulfur. Display or collection of the table of contents. The radioprotective properties of selenium-containing substances were examined in rats that were x-rayed with different doses. Some selenium compounds decolourise glass, while others give a deep red colour. While developing automation frameworks we need to store so many hard coded values to use them in project, so we store all that values in property file. This article explains the setProperty method in Selenium with a sample program. Third-party cookies: those that are sent to the browser or device and are managed by third parties. 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. 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. One allotrope of selenium is an amorphous red powder. The biggest use of selenium is as an additive to glass. Keywords Selenium poisoning may become so severe in some cases that it can even cause death. Normally we use a selenium dose of 200 mcg daily with thyroid hormones to supplement the lack of natural hormone. This last form conducts electricity better in the light than in the dark and is used in photocells. This action neutralizes the formation of dandruff and reduces hair itching. 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. Up to date, curated data provided by Mathematica's ElementData function from Wolfram Research, Inc. Nanotechnology has introduced nanoparticulate form of selenium for a wide variety of applications. These properties make selenium useful in the production of photocells and exposure meters for photographic use, as well as solar cells. Physical properties Selenium exists in a number of allotropic forms. There are many options through which Selenium can be used. Selenium is a micronutrient oligomineral with many properties and which performs numerous functions, both for the human or animal organism, and for the vegetable and various bacteria; in the next paragraph we will examine them in depth. 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. While developing automation frameworks we need to store so many hard coded values to use them in project , so we store all that values in property file . Selenium - Affinity - Electronegativity - Ionization Energy. Furthermore, because the anti-inflammatory effects, selenium stops inflammation that could occur in the walls of the arteries due to atherosclerosis. 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. 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. Follow the "Link to definition of property" or "Link to data for property" of the element selenium. Selenium is a chemical element that is placed in the oxygen group of the periodic table. They allow the creation and collection of session data, such as: number of visits, page views, sections visited, session duration, reference sources, searches carried out, the number of new users, the frequency and recurrence of visits, interest in products or services, the pages visited, the browser and the operator or type of terminal from which the visit is made. This phenomenon causes selenium to end up in local drinking water, so that exposure to selenium through water will be temporarily increased. It is released through both natural processes and human activities. 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. A second allotrope of selenium has a bluish, metallic appearance. 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. Physical state @ 20°C: Solid [4] Color: Vitreous amorphous form: dark red to bluish-black [5] Selenium can also be used to reduce the transmission of sunlight in architectural glass, giving it a bronze tint. Click to read the privacy policy Google, Inc. 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. Up to date, curated data provided by Mathematica's ElementData function from Wolfram Research, Inc. 8) Fertility and Reproductive Health. 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. This table has links to all the properties of selenium included within WebElements. The chemical properties of Selenium are determined by the number of protons, in fact, by number and arrangement of electrons. Keep in mind that in no case will cookies that compromise your privacy be used. Selenium—from Ancient Greek σελήνη (selḗnē) "Moon" – was discovered in 1817 by Jöns Jacob Berzelius, who noted the similarity of the new element … Identifiers are stored to count the number of visits, access dates, geographic location, among other statistical functions. Abstract. Selenium is a photoconductor, which means it has the ability to change light energy into electrical energy. Selenium nanoparticles (Se NPs) attract a lot of attention as potential cancer therapeutic agents. The exposure to selenium mainly takes place through food, because selenium is naturally present in grains, cereals and meat. The functions of selenium in the organism are mainly connected with its antioxidant properties, as it is an essential part of im … Unlike sulfur, selenium is a semiconductor, meaning that it conducts some electricity, but not as well as conductors. 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. This table has links to all the properties of selenium included within WebElements. This type of thyroiditis is an immune system disease in which the body attacks the thyroid causing inflammation and lack of efficiency in the production of thyroid hormone. Selenium, basic physical and chemical properties of the element. In this section you will find information about cookies that can be generated using this web service. In its natural form as an element selenium cannot be created or destroyed, but selenium does have the ability to change form. Specific heat of Selenium is 0.32 J/g K. Latent Heat of Fusion of Selenium is 6.694 kJ/mol. Selenium exists in only trace amounts around us. Selenium is a chemical element with symbol Se and atomic number 34. Martin Klaproth, the discoverer of uranium and zirconium had concluded that a red colored byproduct of sulfuric acid production contained tellurium, an element whose compounds he had been studying. Selenium offers a getText() method used to get the text of an element, i.e. 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. Among various inorganic nanoparticles, the Se can be extensively exploited due to its unique antioxidant properties. We report the production of covalently bonded selenium double-helices within the narrow cavity inside double-wall carbon nanotubes. Technical cookie. Notes on the properties of Selenium: Melting Point: Value given for hexagonal, gray form. Each parameter in properties file are stored as a pair of strings, in key and value format, where each key There are 2 types of cookies depending on their management: When browsing Botanical-online, own and third-party cookies will be generated. Selenium is an element with the atomic number 34. The amount of selenium in different foods depends on the amount of selenium in the soil where the food was grown. Compare elements on more than 90 properties. ©1999-2020 Botanical-Online SL - All rights reserved. In chemical activity and physical properties it resembles sulfur and tellurium. Exposure to selenium through air only comes about in the workplace usually. Its artistic use is to intensify and extend the tonal range of black and white photographic images. This enzyme gets inhibit prostaglandin production. Selenium is used to improve the abrasion resistance in vulcanized rubbers. 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. Humans need to absorb certain amounts of selenium daily, in order to maintain good health. Selenium dioxide reacts with moisture to form selenious acid, which is corrosive to the skin and eyes. Notes on the properties of Selenium: Melting Point: Value given for hexagonal, gray form. Selenium exhibits both photovoltaic action, where light is converted directly into electricity, and photoconductive action, where the electrical resistance decreases with increased illumination. Selenium has antioxidant properties, and research shows that the mineral may help improve immune response. 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. The third min use, taking about 15% is sodium selenite for animal feeds and food supplements. Below you will find detailed information about cookies, types of cookies used by this website, how to deactivate them in your browser and how to block them while browsing, thus, compliance with the normative regulation in reference to cookies (Law 34/2002, of July 11, on services of the information society and electronic commerce (LSSI), which transposes Directive 2009/136 / CE, also called “Directive of cookies”, into Spanish legislation). We pay special attention to antioxidant activities of selenium compounds, especially selenoproteins, and their importance in antioxidant defence. 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. – Anticancer: Selenium is a good protection against the development of cancer cells. Many of these toxins, together with other factors, may be responsible for the appearance of numerous cancers. Due to irrigation run-off concentrations of selenium tend to be very high in aquatic organisms in many areas. In men, selenium is important for producing sperm and testosterone. It will than be taken up by plants or end up in air when it is adsorbed on fine dust particles. The RDA depends, as we can see, on age and sex. Properties File in selenium is a plain notepad file that are used to store the hard coded values in selenium. Overexposure may result in red staining of the nails, teeth and hair. 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. It rarely occurs in its elemental state or as pure ore compounds in the Earth's crust. Humans may be exposed to selenium in several different ways. 1. Se-76 can be used for the production of the medical isotopes Br-75 and Br-76. Although there is no known mechanism by which this mineral acts, there have been numerous studies that have shown the link between a diet low in selenium and increased lung, stomach, liver and colon cancers. These properties make selenium useful in the production of photocells and exposure meters for photographic use, as well as solar cells. By mixing them, selenium sulfide occurs acting on the scalp. IN a letter headed ``Anomalous behaviour of Selenium,'' which appeared in NATURE (vol. To ensure that the website can function correctly. 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. Compare elements on more than 90 properties. Generated by Google services (for example reCaptcha, Youtube, search. Food usually contains enough selenium to prevent disease caused by shortages. Navigate to the LambdaTest website. Selenium nanoparticles are widely used in the field of medicine. Finley JW, Ip C, Lisk DJ, et al. Home; Random; Nearby; Log in; Settings; Donate; About Wikipedia; Disclaimers A lump of clay is an example of an amorphous material. Selenium anti-inflammatory properties are due to the role that this component plays in the production of the enzyme glutathione peroxidase. 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. Selenium is used with very great efficacy for the treatment of hypothyroidism caused by Hashimoto ‘s thyroiditis or chronic thyroiditis. Burns in contact with air but is unaffected by water. Introduction. The second largest use of selenium is in the glass industry: selenium is used to remove colour from glass, to give a red colour to glasses and enamels. Black selenium is converted to grey selenium when temperature is increased to around 180°C. Well fertilized agricultural soil generally has about 400 mg/ton since the element is naturally present in phosphate fertilizers ans is often added as a trace nutrient. J Agric Food Chem 2001;49:2679-83. Retrouvez Synthesis and Properties of Selena and Other Selenium-Containing Long Chain Fatty Acid Derivatives et des millions de livres en stock sur Amazon.fr. 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. Grey allotropic form of seleni… To collect anonymous statistical information to improve quality. They are managed by Google DoubleClick. Se NPs have weak anti-tumor effects before functionalization. Properties of Selenium Image will be added soon. Some selenium compounds are added to anti-dandruff shampoos. Selenium has been used as a common component of dandruff shampoos. Generates random alphanumeric data to protect the website by detecting and mitigating malicious activities. Link to definition of property Link to selenium data for property; Abundances of the elements: Its symbol is Se and belongs to the group of nonmetals and its habitual state in nature is solid. Noté /5. This substance will be converted into selenium acid in water or sweat. Selenium plays an important role in the health of your immune system. Analytical cookie. Selenium exhibits photovoltaic action, where light is converted directly into electricity, and photoconductive … Specific Heat: Value given for solid hexagonal form. I am anxious to learn where an account of this remarkable observation is to be found. An excess of selenium is toxic. Selenium is a chemical element with the symbol Se and atomic number 34. Selenium is a trace element which fulfils important functions in the organism. The data they keep is of a technical nature. In case of doubt, consult the doctor. Rain, evaporation, pesticides, and pH levels can all affect selenium levels in soil. Social cookie. We cannot access the data stored in the cookies of other websites when you browse the aforementioned websites. Likewise, it is used to reduce the side effects of chemotherapy. Antioxidants protect cells from damage. Its melting point is 221 ℃. Basic facts about selenium. – Detoxifying: Selenium is able to neutralize the toxic effect of many heavy elements such as lead, cadmium, mercury, etc.. Selenium helps restore an imbalanced circadian rhythm, which often affects people with insomnia. Compare Bromine and Selenium on the basis of their properties, attributes and periodic table facts. The information is always anonymous. The following table shows the recommended daily dose of selenium. A lump of clay is an example of an amorphous material. Selenium occurs naturally in the environment. Selenium is an eye and upper respiratory irritant and a sensitizer. It shows hexagonal crystal structure. Selenium is mostly noted for its important chemical properties, especially those dealing with electricity. 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 revitalizing properties of selenium are sometimes used to treat gray hair. Supporting ab initio calculations indicate that the … 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. Electronegativity of Selenium is 2.55. The main symptoms that indicate a lack of selenium are: – Increased susceptibility to food poisoning, – Increased susceptibility to chemical poisoning. Selenium nanoparticles (Se 0 NPs) have been well-characterized; however, whether processing affects their physicochemical and functional properties remains unknown. There is evidence selenium can accumulate in the body tissues of organisms and can than be passed up through the food chain. We report the production of covalently bonded selenium double-helices within the narrow cavity inside double-wall carbon nanotubes. It can cause dizziness, fatigue and irritations of the mucous membranes. 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. In most preparations selenium is mixed with sulfur. 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. However, the antitumor activities of pure Se NPs are poor, and some modifiers are needed to enhance the activities. Thus succeeds in improving the elasticity of blood vessels and, consequently, improves blood circulation. Pregnant or lactating women need an extra amount. Selenium from hazardous waste-sites and from farmland will end up in groundwater or surface water through irrigation. In chemical activity and physical properties it resembles sulfur and tellurium. Each browser has a different configuration. They are the cookies of the Google Analytics. 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 … More studies are needed to evaluate the immune-stimulating properties of selenium. Se-82 has been used to study double beta decay. Let us now see how to get text of an element in Selenium using parallel tests. When selenium in soils does not react with oxygen it remains fairly immobile. All the elements of similar categories show a lot of similarities and differences in their chemical, atomic, physical properties and uses. Web Driver API fit with the same role as played by Selenium RC. Botanical-online use cookies to store, access or process the user's personal information to carry out statistical tasks, display personalized ads or for the simple correct operation of the user's navigation. Properties of Selenium Moss, Richard J. Abstract. It’s a non-metallic chemical element which is a member of the group 16 … We do not have access to stored data (for example, by pressing social media buttons or viewing videos hosted on another website), which are those established by a different domain of our Website. Prostaglandins have an inflammatory effect. This website uses cookies to access, store and process personal data during your visit. Especially, because of their potential anti-tumor activity, functionalized selenium nanoparticles have been established as potential candidates for the treatment of many cancers. In current review, we have discussed the antioxidant and pro-oxidant properties of selenium nanoparticles and their mechanism of action involving in reducing the generation of ROS.