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7.4 Genotoxic Effects. The evidence for beryllium as a directly acting mutagen is weak and inconsistent. Most studies have found that beryllium chloride, beryllium nitrate, beryllium sulfate, and beryllium oxide did not induce gene mutations in bacterial assays with or without metabolic activation.
Beryllium oxide (BeO), also known as beryllia, is an inorganic compound with the formula BeO. This colourless solid is a notable electrical insulator with a higher thermal conductivity than any other non-metal except diamond, and exceeds that of most metals.
Beryllium is a chemical element known by the chemical symbol "Be". It is an Alkaline earth metal found in the second column of the periodic table along with Magnesium, Calcium, Strontium, Barium, and Radium. Although bearing the atomic number of four, Beryllium remains highly nonreactive with other elements.
Beryllium definition is - a toxic divalent metallic element with four protons that is steel-gray in color, light and strong but brittle, and is used chiefly as a hardening agent in alloys.
Beryllium combines with many non-metals to form binary compounds, such as beryllium oxide (BeO). BeO is a white solid that has a high melting point, making it useful in engines, radio equipment, and semiconductor devices.
1 Deborah A. Kramer, "Beryllium," from Mineral Commodity ... Kirk-Othmer Encyclopedia of Chemical ... and Beryllium Alloys," Kirk-Othmer Encyclopedia of ...
Specifically, beryllium is used in nuclear reactors as a neutron reflector or moderator, and in the aerospace industry in inertial guidance systems; beryllium alloys (consisting of copper or aluminum) are also used in structural material.
the beryllium-exposure takes place in the production of precision optical instruments including fiberoptics. Beryllium oxide is the most important high-purity commercial beryllium chemical, with primary use in ceramics manufacturing. Because beryllium-oxide is transparent to microwaves, it is also used in microwave devices.
Feb 21, 2007· i need the physical and chemical ... The modulus of elasticity of beryllium is ... education.yahoo/reference/encyclopedia ...
The fifth edition of the Kirk-Othmer Encyclopedia of Chemical Technology builds upon the solid foundation of the previous ... Beryllium, Beryllium Alloys and ...
Beryllium fluoride Beryllium fluoride IUPAC name ... Beryllium fluoride is the chemical compound with ... bionity/en/encyclopedia/Beryllium ...
A toxic tort is a legal claim for harm caused by exposure to a dangerous substance -- such as a pharmaceutical drug, pesticide, or chemical. If an individual or a group of people has been exposed to and injured by a dangerous substance, either may be able to bring a toxic tort lawsuit.
Description This is an easily-accessible two-volume encyclopedia summarizing all the articles in the main volumes Kirk-Othmer Encyclopedia of Chemical Technology, Fifth Edition organized alphabetically.
As a consequence of the high ionisation energy of beryllium its halides are essentially covalent, with comparatively low m.p.. the melts being non-conducting and (except beryllium fluoride) dissolving in many organic solvents.
Beryllium and its salts are toxic substances[?] and potentially carcinogenic. Chronic berylliosis is a pulmonary and systemic granulomatous disease caused by exposure to beryllium. Acute beryllium disease in the form of chemical pneumonitis was first reported in Europe in 1933 and in the United States in 1943.
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How to Cite. Kaczynski, D. J. 2002. Beryllium, Beryllium Alloys, and Beryllium Composities. Kirk-Othmer Encyclopedia of Chemical Technology. .
The hydrides of beryllium and magnesium are both largely covalent, magnesium hydride having a rutile (p. 36) structure, while beryllium …
Beryllium was identified as a unique element and as a constituent of the mineral beryl and the gem emerald by the French chemist Louis Vauquelin in 1797. Metallic beryllium was isolated in 1828 by the scientists (working independently of one another) Antoine Bussy and Friedrich Wöhler.
Beryllium is the chemical element with the symbol Be and atomic number 4. A bivalent element, beryllium is found naturally only combined with other elements in minerals. Notable gemstones which contain beryllium include …
Acute beryllium disease in the form of chemical pneumonitis was first reported in Europe in 1933 and in the United States in 1943. Cases of chronic berylliosis were first described in 1946 among workers in plants manufacturing fluorescent lamps in Massachusetts.
Beryllium is a chemical element with symbol Be and atomic number 4. It is a relatively rare element in the universe, usually occurring as a product of the spallation of larger atomic nuclei that have collided with cosmic rays. Within the cores of stars beryllium is depleted as it is fused and creates larger elements.
Inhalation of beryllium fumes or particles may cause the formation of granulomas in the lungs, skin, and subcutaneous tissues. beryllium a chemical element, atomic number 4, atomic weight 9.012, symbol Be.
Home » About Beryllium The following information is derived from the DOE Training Reference for Beryllium Workers and Managers/Supervisors Participant Manual entitled, Communicating Health Risks, Working Safely With Beryllium, May 1998.
7.4 Genotoxic Effects. The evidence for beryllium as a directly acting mutagen is weak and inconsistent. Most studies have found that beryllium chloride, beryllium nitrate, beryllium sulfate, and beryllium oxide did not induce gene mutations in bacterial assays with or without metabolic activation.
environmental contaminants encyclopedia ... with assistance from colorado state university student assistant contaminants ... beryllium is a rare chemical ...
Beryllium oxide (BeO), ... Formation of BeO from beryllium and oxygen releases the highest energy per mass of reactants for any chemical reaction, close to 24 MJ/kg.
The elements are beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra). Occurrence, properties, and uses. Beryllium is a steel-gray metal that is quite brittle at room temperature, and its chemical properties somewhat resemble those of aluminum. It does not occur free in nature.
Beryllium is the lightest member of the alkaline earth metals family. These metals make up Group 2 (IIA) of the periodic table. They include beryllium, magnesium, calcium, strontium, barium, and radium. Elements in the same column of the periodic table have similar chemical properties.
At one time beryllium was referred to as glucinium (from Greek glykys, sweet), due to the sweet taste of its salts (with the accompanying chemical symbol "Gl" ) . This element was discovered by Louis Vauquelin in 1798 as the oxide in beryl and in emeralds.
Beryllium (chemical symbol Be, atomic number 4) ranks among the lightest of all known metals. Steel-gray in color, it is strong but brittle. It is classified as an alkaline earth metal, along with calcium and magnesium. Precious forms of …
Beryllium Figure 12: The energy levels of three nuclei with A = 6, relative to the ground state of 6Li after subtraction… Figure 1: Radioactive decay of beryllium-7 to lithium-7 …
Preparation and chemical properties. Beryllium oxide can be prepared by calcining (roasting) beryllium carbonate, dehydrating beryllium hydroxide, or igniting metallic beryllium: BeCO 3 → BeO + CO 2 Be(OH) 2 → BeO + H 2 O 2 Be + O 2 → 2 BeO. Igniting beryllium in air gives a mixture of BeO and the nitride Be 3 N 2.
Beryllium is a hard, grayish metal naturally found in mineral rocks, coal, soil, and volcanic dust. Beryllium compounds are commercially mined, and the Beryllium is purified for use in nuclear weapons and reactors, aircraft and space vehicle structures, instruments, x-ray machines, and mirrors.
Beryllium is used in the Joint European Torus fusion research facility and will be used in ITER, to condition the plasma facing components. Compounds. Beryllium is an effective p-type dopant in III-V compound semiconductors. It is widely used in materials such as GaAs, AlGaAs, InGaAs, and InAlAs grown by molecular beam epitaxy (MBE).
Beryllium carbide, Be 2 C, may be prepared by heating a mixture of beryllium oxide and carbon to 1950–2000°C. The reaction is accompanied by a substantial exotherm. The melting point of beryllium carbide is 2250–2400 °C.
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