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Wikipedia is written by volunteer editors and hosted by the Wikimedia Foundation, a non-profit organization that also hosts a range of other volunteer projects : Commons. Free media repository. MediaWiki. Wiki software development. Meta-Wiki. Wikimedia project coordination. Wikibooks. Free textbooks and manuals.
Antikythera mechanism. The Antikythera mechanism (fragment A – front and rear); visible is the largest gear in the mechanism, about 13 cm (5 in) in diameter. The Antikythera mechanism ( / ˌæntɪkɪˈθɪərə / AN-tik-ih-THEER-ə, US also / ˌæntaɪkɪˈ -/ AN-ty-kih-) [1] [2] is an Ancient Greek hand-powered orrery (model of the Solar ...
Hydrogen peroxide is a chemical compound with the formula H 2 O 2. In its pure form, it is a very pale blue [5] liquid that is slightly more viscous than water. It is used as an oxidizer, bleaching agent, and antiseptic, usually as a dilute solution (3%–6% by weight) in water for consumer use and in higher concentrations for industrial use.
- Uses
- Health Effects
- Available Forms and Nomenclature
- Production
- Safety
- See Also
Medical uses
1. Pharmaceutical-grade PEG is used as an excipientin many pharmaceutical products, in oral, topical, and parenteral dosage forms. 2. PEG is the basis of a number of laxatives (as MiraLax, RestoraLAX, etc.). Whole bowel irrigation with polyethylene glycol and added electrolytes is used for bowel preparation before surgery or colonoscopy or for children with constipation. Macrogol (with brand names such as Laxido, Movicol and Miralax) is the generic name for polyethylene glycol used as a laxat...
Chemical uses
1. Polyethylene glycol is also commonly used as a polar stationary phase for gas chromatography, as well as a heat transfer fluidin electronic testers. 2. PEG is frequently used to preserve waterlogged wood and other organic artifacts that have been salvaged from underwater archaeological contexts, as was the case with the warship Vasa in Stockholm, and similar cases. It replaces water in wooden objects, making the wood dimensionally stable and preventing warping or shrinking of the wood when...
Biological uses
1. An example study was done using PEG-diacrylate hydrogels to recreate vascular environments with the encapsulation of endothelial cells and macrophages. This model furthered vascular disease modeling and isolated macrophage phenotype's effect on blood vessels. 2. PEG is commonly used as a crowding agent in in vitro assays to mimic highly crowded cellular conditions. Although polyethylene glycol is considered biologically inert, it can form non-covalent complexes with monovalent cations such...
PEG is considered biologically inert and safe by the U.S. FDA. However, a growing body of evidence shows the existence of a detectable level of anti-PEG antibodies in approximately 72% of the population, never treated with PEGylated drugs, based on plasma samples from 1990 to 1999.[further explanation needed] Due to its ubiquity in a multitude of p...
PEG, PEO, and POE refer to an oligomer or polymer of ethylene oxide. The three names are chemically synonymous, but historically PEG is preferred in the biomedical field, whereas PEO is more prevalent in the field of polymer chemistry. Because different applications require different polymer chain lengths, PEG has tended to refer to oligomers and p...
The production of polyethylene glycol was first reported in 1859. Both A. V. Lourenço and Charles Adolphe Wurtz independently isolated products that were polyethylene glycols. Polyethylene glycol is produced by the interaction of ethylene oxide with water, ethylene glycol, or ethylene glycol oligomers. The reaction is catalyzed by acidic or basic c...
PEO's have "very low singledose oral toxicity", on the order of tens of grams per kg body weight (oral). Because of its low toxicity, PEO is used in a variety of edible products.The polymer is used as a lubricating coating for various surfaces in aqueous and non-aqueous environments. The precursor to PEGs is ethylene oxide, which is hazardous. Ethy...
Jen-Hsun "Jensen" Huang (Chinese: 黃仁勳; pinyin: Huáng Rénxūn; Pe̍h-ōe-jī: N̂g Jîn-hun; born 17 February 1963[2]) is an American businessman, electrical engineer, and the co-founder, president and CEO of Nvidia.[3] He co-founded Nvidia in 1993 at age 30 and in June 2024, it became the largest company in the world by market ...
James Clavell (born Charles Edmund Dumaresq Clavell; 10 October 1921 [1] [2] – 7 September 1994) was an Australian-born, British-raised and educated, naturalized-American writer, screenwriter, director, and World War II veteran and prisoner of war. Clavell is best known for his Asian Saga novels, a number of which have had television adaptations.
A lithium-ion or Li-ion battery is a type of rechargeable battery that uses the reversible intercalation of Li + ions into electronically conducting solids to store energy.
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