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In the construction industry , the 1:5:200 rule (or 1:5:200 ratio ) is a rule of thumb that states that:
If the initial construction costs of a building is 1, then its maintenance and operating costs over the years is 5, and the business operating costs (salary of people working in that building) is 200.
The rule ori... | https://en.wikipedia.org/wiki/1:5:200 |
In mathematics , 1 + 1 + 1 + 1 + ⋯ , also written ∑ n = 1 ∞ n 0 {\displaystyle \textstyle \sum _{n=1}^{\infty }n^{0}} , ∑ n = 1 ∞ 1 n {\displaystyle \textstyle \sum _{n=1}^{\infty }1^{n}} , or simply ∑ n = 1 ∞ 1 {\displaystyle \textstyle \sum _{n=1}^{\infty }1} , is a divergent series . Nevertheless, it is ... | https://en.wikipedia.org/wiki/1_+_1_+_1_+_1_+_⋯ |
In mathematics , 1 + 2 + 4 + 8 + ⋯ is the infinite series whose terms are the successive powers of two . As a geometric series , it is characterized by its first term, 1, and its common ratio , 2. As a series of real numbers it diverges to infinity , so in the usual sense it has no sum. However, it can be manipulated ... | https://en.wikipedia.org/wiki/1_+_2_+_4_+_8_+_⋯ |
In air navigation , the 1 in 60 rule is a rule of thumb which states that if a pilot has traveled sixty miles then an error in track of one mile is approximately a 1° error in heading, and proportionately more for larger errors. The rule is used by pilots with many other tasks to perform, often in a basic aircraft with... | https://en.wikipedia.org/wiki/1_in_60_rule |
1seg ( ワンセグ , wansegu ) is a mobile terrestrial digital audio/video and data broadcasting service in Japan , Argentina , Brazil , Chile , Uruguay , Paraguay , Peru and the Philippines . Service began experimentally during 2005 and commercially on April 1, 2006. It is designed as a component of ISDB-T , the terrestrial ... | https://en.wikipedia.org/wiki/1seg |
2,2′-Dipyridyldisulfide , sometimes known as DPS, is used for preparing thiols [ 1 ] [ 2 ] and activating carboxylic acid for coupling reactions , as in the following reaction: [ 3 ]
It is also used in molecular biology as an oxidising agent , for example to oxidise free thiols to form disulfide bonds in proteins.
Th... | https://en.wikipedia.org/wiki/2,2'-Dipyridyldisulfide |
Trichloroethyl chloroformate is used in organic synthesis for the introduction of the trichloroethyl chloroformate (Troc) protecting group for amines , thiols and alcohols . It readily cleaves vs other carbamates and can be used in an overall protecting group strategy.
The troc group is traditionally removed via Zn i... | https://en.wikipedia.org/wiki/2,2,2-Trichloroethoxycarbonyl_chloride |
2,2,6,6-Tetramethylpiperidine , abbreviated TMP , HTMP , or TMPH , is an organic compound of the amine class. In appearance, it is a colorless liquid and has a "fishy", amine-like odor. This amine is used in chemistry as a hindered base ( hindered amine ). Although TMP finds limited use per se, its derivatives are a m... | https://en.wikipedia.org/wiki/2,2,6,6-Tetramethylpiperidine |
2,2-Dimethoxypropane ( DMP ) is an organic compound with the formula (CH 3 ) 2 C(OCH 3 ) 2 . A colorless liquid, it is the product of the condensation of acetone and methanol . DMP is used as a water scavenger in water-sensitive reactions. Upon acid-catalyzed reaction, DMP reacts quantitatively with water to form aceto... | https://en.wikipedia.org/wiki/2,2-Dimethoxypropane |
2,3-Dichloro-5,6-dicyano-1,4-benzoquinone (or DDQ ) is the chemical reagent with formula C 6 Cl 2 (CN) 2 O 2 . This oxidant is useful for the dehydrogenation of alcohols, [ 3 ] phenols, [ 4 ] and steroid ketones. [ 5 ] DDQ decomposes in water, but is stable in aqueous mineral acid . [ 6 ]
Synthesis of DDQ involves cya... | https://en.wikipedia.org/wiki/2,3-Dichloro-5,6-dicyano-1,4-benzoquinone |
The [2,3]-Wittig rearrangement is the transformation of an allylic ether into a homoallylic alcohol via a concerted, pericyclic process . Because the reaction is concerted, it exhibits a high degree of stereocontrol, and can be employed early in a synthetic route to establish stereochemistry. The Wittig rearrangement r... | https://en.wikipedia.org/wiki/2,3-Wittig_rearrangement |
2,3-Sigmatropic rearrangements are a type of sigmatropic rearrangements and can be classified into two types. Rearrangements of allylic sulfoxides , amine oxides , selenoxides are neutral . Rearrangements of carbanions of allyl ethers are anionic . [ 1 ] The general scheme for this kind of rearrangement is:
Atom Y may... | https://en.wikipedia.org/wiki/2,3-sigmatropic_rearrangement |
2,4,6-Tri- tert -butylpyrimidine is the organic compound with the formula HC(Bu t C) 2 N 2 C t Bu where t Bu = (CH 3 ) 3 C. It is a substituted derivative of the heterocycle pyrimidine . Known also as TTBP, this compound is of interest as a base that is sufficiently bulky to not bind boron trifluoride but still able ... | https://en.wikipedia.org/wiki/2,4,6-Tri-tert-butylpyrimidine |
2,4,6-Trichlorobenzoyl chloride or Yamaguchi's reagent is an chlorinated aromatic compound that is commonly used in a variety of organic syntheses. [ 2 ] [ 3 ]
It is the primary reactant in Yamaguchi esterification . 2,4,6-Trichlorobenzoyl chloride readily reacts with alcohols . This newly formed reagent , when mixed ... | https://en.wikipedia.org/wiki/2,4,6-Trichlorobenzoyl_chloride |
2,4,6-Triisopropylbenzenesulfonyl azide ( trisyl azide ) is an organic chemical used as a reagent to supply azide for electrophilic amination reactions, such as for the asymmetric synthesis of unnatural amino acids . [ 2 ] Introduction of an azide on the α carbon of carboxylic acid derivative using trisyl azide is an e... | https://en.wikipedia.org/wiki/2,4,6-Triisopropylbenzenesulfonyl_azide |
2,4,6-Trinitroaniline , C 6 H 4 N 4 O 6 , abbreviated as TNA and also known as picramide , a nitrated amine . Materials in this group range from slight to strong oxidizing agents . If mixed with reducing agents , including hydrides , sulfides and nitrides , they may begin a vigorous reaction that culminates in a detona... | https://en.wikipedia.org/wiki/2,4,6-Trinitroaniline |
Trinitrobenzenesulfonic acid (C 6 H 3 N 3 O 9 S) is a nitroaryl oxidizing acid . Due to its extreme oxidative properties, if mixed with reducing agents including hydrides , sulfides , and nitrides , it may begin a vigorous reaction that culminates in almost immediate detonation. The aromatic nitro compounds may explode... | https://en.wikipedia.org/wiki/2,4,6-Trinitrobenzenesulfonic_acid |
2,4,6-Trinitrobenzoic acid ( TNBA ) is an organic compound with the formula (O 2 N) 3 C 6 H 2 CO 2 H. It is a high explosive nitrated derivative of benzoic acid .
2,4,6-Trinitrobenzoic acid is prepared by oxidation of 2,4,6-trinitrotoluene (TNT). It is formed by oxidation of TNT and nitric acid with chlorate [ 2 ] an... | https://en.wikipedia.org/wiki/2,4,6-Trinitrobenzoic_acid |
2,4,6-Tris(trinitromethyl)-1,3,5-triazine is a chemical compound that is a derivative of triazine first prepared in 1995. [ 1 ] It is synthesized by destructive nitration of 2,4,6-tricarboxyl-1,3,5-triazine. It is noteworthy for having more nitro groups than it does carbon atoms, thus potentially being useful as an oxy... | https://en.wikipedia.org/wiki/2,4,6-Tris(trinitromethyl)-1,3,5-triazine |
2,4-Dinitroanisole ( DNAN ) is a low sensitivity organic compound. It has an anisole (methoxybenzene) core, with two nitro groups (–NO 2 ) attached. [ 1 ]
It is not explosive itself unless it is mixed with other explosive chemicals in certain ratios. Compared with TNT it has only 90% of the explosive power and is les... | https://en.wikipedia.org/wiki/2,4-Dinitroanisole |
2,4-Dinitrophenol ( 2,4-DNP or simply DNP ) is an organic compound with the formula HOC 6 H 3 (NO 2 ) 2 . It has been used in explosives manufacturing and as a pesticide and herbicide.
In humans, DNP causes dose-dependent mitochondrial uncoupling , causing the rapid loss of ATP as heat and leading to uncontrolled hype... | https://en.wikipedia.org/wiki/2,4-Dinitrophenol |
2,4-Dinitrophenylhydrazine ( 2,4-DNPH or DNPH ) is the organic compound C 6 H 3 (NO 2 ) 2 NHNH 2 . DNPH is a red to orange solid. It is a substituted hydrazine . The solid is relatively sensitive to shock and friction . For this reason DNPH is usually handled as a wet powder. DNPH is a precursor to the drug Sivifene .
... | https://en.wikipedia.org/wiki/2,4-Dinitrophenylhydrazine |
[ 2 ]
2,4-Dinitrotoluene ( DNT ) or dinitro is an organic compound with the formula C 7 H 6 N 2 O 4 . This pale yellow crystalline solid is well known as a precursor to trinitrotoluene (TNT) but is mainly produced as a precursor to toluene diisocyanate .
Six positional isomers are possible for dinitrotoluene. The mos... | https://en.wikipedia.org/wiki/2,4-Dinitrotoluene |
2,5-diamino-6-hydroxy-4-(5-phosphoribosylamino)pyrimidine is a metabolite in the purine metabolism, formed by the hydrolysis of GTP by GTP cyclohydrolase II . [ 1 ] Alternatively two separate enzymes can carry out this reaction, initially GTP cyclohydrolase IIa hydrolyses the 8,9 bond to form 2-Amino-5-formylamino-6-(5... | https://en.wikipedia.org/wiki/2,5-Diamino-6-hydroxy-4-(5-phosphoribosylamino)pyrimidine |
2,6-Di- tert -butylpyridine is an organic compound with the formula (Me 3 C) 2 C 5 H 3 N. This colourless, oily liquid is derived from pyridine by replacement of the two H atoms with tert-butyl groups. It is a hindered base . [ 1 ] For example, it can be protonated, but it does not form an adduct with boron trifluor... | https://en.wikipedia.org/wiki/2,6-Di-tert-butylpyridine |
2-(Dicyanomethylene)croconate is a divalent anion with chemical formula C 8 N 2 O 2− 4 or ((N≡C−) 2 C=)(C 5 O 4 ) 2− . It is one of the pseudo-oxocarbon anions , as it can be described as a derivative of the croconate oxocarbon anion C 5 O 2− 5 through the replacement of one oxygen atom by a dicyanomethylene group =C(... | https://en.wikipedia.org/wiki/2-(Dicyanomethylene)croconate |
The Aiken code (also known as 2421 code ) [ 1 ] [ 2 ] is a complementary binary-coded decimal (BCD) code. A group of four bits is assigned to the decimal digits from 0 to 9 according to the following table. The code was developed by Howard Hathaway Aiken and is still used today in digital clocks , pocket calculators an... | https://en.wikipedia.org/wiki/2-4-2-1_code |
N -2-Fluorenylacetamide [ 1 ]
2-Acetylaminofluorene (AAF, [ 4 ] 2-AAF) is a carcinogenic and mutagenic derivative of fluorene . It is used as a biochemical tool in the study of carcinogenesis . It induces tumors in a number of species in the liver, bladder and kidney. The metabolism of this compound in the body by me... | https://en.wikipedia.org/wiki/2-Acetylaminofluorene |
2-Amino-4-hydroxy-6-pyrophosphoryl-methylpteridine ( 7,8-Dihydropterin pyrophosphate , dihydropterin-CH2OH-diphosphate ) is a pteridine ; a precursor to dihydrofolic acid . [ 1 ]
This article about an organic compound is a stub . You can help Wikipedia by expanding it .
This biochemistry article is a stub . You can h... | https://en.wikipedia.org/wiki/2-Amino-4-hydroxy-6-pyrophosphoryl-methylpteridine |
2- C -Methyl- D -erythritol 4-phosphate ( MEP ) is an intermediate on the MEP pathway (non-mevalonate pathway) of isoprenoid precursor biosynthesis. [ 1 ] It is the first committed metabolite on that pathway on the route to IPP and DMAPP .
This biochemistry article is a stub . You can help Wikipedia by expanding it . | https://en.wikipedia.org/wiki/2-C-Methylerythritol_4-phosphate |
2-Furoic acid is an organic compound , consisting of a furan ring and a carboxylic acid side-group. Along with other furans, its name is derived from the Latin word furfur , meaning bran, from which these compounds were first produced. [ 2 ] The salts and esters of furoic acids are known as furoates . 2-Furoic acid is ... | https://en.wikipedia.org/wiki/2-Furoic_acid |
2-Hydroxyestriol , also known as estra-1,3,5(10)-triene-2,3,16α,17β-tetrol , is an endogenous catechol estrogen and metabolite of estriol . It is a suspected carcinogen of carcinogenicity category 2. [ 1 ]
This article about a steroid is a stub . You can help Wikipedia by expanding it . | https://en.wikipedia.org/wiki/2-Hydroxyestriol |
2-Iodophenol ( o -iodophenol ) is an aromatic organic compound with the formula IC 6 H 4 OH. It is a pale yellow solid that melts near room temperature. It undergoes a variety of coupling reactions in which the iodine substituent is replaced by a new carbon group ortho to the hydroxy group of the phenol , which can be... | https://en.wikipedia.org/wiki/2-Iodophenol |
2-Iodoxybenzoic acid ( IBX ) is an organic compound used in organic synthesis as an oxidizing agent . This periodinane is especially suited to oxidize alcohols to aldehydes . IBX is most often prepared from 2-iodobenzoic acid and a strong oxidant such as potassium bromate and sulfuric acid , [ 1 ] or more commonly, oxo... | https://en.wikipedia.org/wiki/2-Iodoxybenzoic_acid |
2-Mercaptoethanol (also β-mercaptoethanol , BME , 2BME , 2-ME or β-met ) is the chemical compound with the formula HOCH 2 CH 2 SH. ME or βME, as it is commonly abbreviated, is used to reduce disulfide bonds and can act as a biological antioxidant by scavenging hydroxyl radicals (amongst others). It is widely used beca... | https://en.wikipedia.org/wiki/2-Mercaptoethanol |
2-Methoxyethoxymethyl chloride is an organic compound with formula CH 3 OCH 2 CH 2 OCH 2 Cl . A colorless liquid, it is classified as a chloroalkyl ether . It is used as an alkylating agent . In organic synthesis , it is used for introducing the methoxyethoxy ether ( MEM ) protecting group . [ 2 ] MEM protecting grou... | https://en.wikipedia.org/wiki/2-Methoxyethoxymethyl_chloride |
2-Methoxypropene is an ether with the chemical formula C 4 H 8 O. It is a reagent used in organic synthesis to introduce a protecting group for alcohols, [ 1 ] and the conversion diols to the acetonide group. [ 3 ]
2-Methoxypropene can be prepared by the elimination of methanol from dimethoxypropane , [ 4 ] or by the... | https://en.wikipedia.org/wiki/2-Methoxypropene |
2-Nitrodiphenylamine is an organic chemical with the formula C 6 H 5 NHC 6 H 4 NO 2 . It is a nitrated derivative of diphenylamine . It is a red solid, usually found in form of flakes or powder. It is polar but hydrophobic .
Diphenylamine is used to extend the shelf-life of explosives containing nitrocellulose or nit... | https://en.wikipedia.org/wiki/2-Nitrodiphenylamine |
In organic chemistry , the term 2-norbornyl cation (or 2-bicyclo[2.2.1]heptyl cation ) describes a carbonium ionic derivative of norbornane . A salt of the 2-norbornyl cation was crystallized and characterized by X-ray crystallography confirmed the non-classical structure. [ 1 ]
Advocates of the non-classical nature o... | https://en.wikipedia.org/wiki/2-Norbornyl_cation |
2-Oxoadipic acid , also known as α-ketoadipic acid , is an intermediate in the metabolism of lysine and tryptophan . [ 3 ] [ 4 ] The conjugate base and carboxylate is 2-oxoadipate or α-ketoadipate , which is the biochemically relevant form.
This biochemistry article is a stub . You can help Wikipedia by expanding it .... | https://en.wikipedia.org/wiki/2-Oxoadipic_acid |
2-Phenylpyridine is an organic compound with the formula C 6 H 5 C 5 H 4 N (or C 11 H 9 N). It is a colourless viscous liquid. The compound and related derivatives have attracted interest as precursors to highly fluorescent metal complexes of possible value as organic light emitting diodes (OLEDs). [ 1 ]
The compound... | https://en.wikipedia.org/wiki/2-Phenylpyridine |
2-Phosphoglyceric acid ( 2PG ), or 2-phosphoglycerate , is a glyceric acid which serves as the substrate in the ninth step of glycolysis . It is catalyzed by enolase into phosphoenolpyruvate (PEP), the penultimate step in the conversion of glucose to pyruvate .
Compound C00197 at KEGG Pathway Database. Enzyme 5.4.2.1 ... | https://en.wikipedia.org/wiki/2-Phosphoglyceric_acid |
A 2-in-1 laptop , also known as 2-in-1 PC , 2-in-1 tablet , [ 1 ] laplet , [ 2 ] [ 3 ] tabtop , laptop tablet , or simply 2-in-1 , is a portable computer that has features of both tablets and laptops .
2-in-1 PCs consist of portable computer components within light and thin chassis , and exemplify technological conver... | https://en.wikipedia.org/wiki/2-in-1_laptop |
In optimization , 2-opt is a simple local search algorithm for solving the traveling salesman problem .
The 2-opt algorithm was first proposed by Croes in 1958, [ 1 ] although the basic move had already been suggested by Flood. [ 2 ] The main idea behind it is to take a route that crosses over itself and reorder it so ... | https://en.wikipedia.org/wiki/2-opt |
There are several uses of the 2.4 GHz ISM radio band . Interference may occur between devices operating at 2.4 GHz . This article details the different users of the 2.4 GHz band, how they cause interference to other users and how they are prone to interference from other users.
Many [ quantify ] of the cordless teleph... | https://en.wikipedia.org/wiki/2.4_GHz_radio_use |
20-Hydroxyeicosatetraenoic acid , also known as 20-HETE or 20-hydroxy-5 Z ,8 Z ,11 Z ,14 Z -eicosatetraenoic acid, is an eicosanoid metabolite of arachidonic acid that has a wide range of effects on the vascular system including the regulation of vascular tone, blood flow to specific organs, sodium and fluid transport ... | https://en.wikipedia.org/wiki/20-Hydroxyeicosatetraenoic_acid |
This article is a summary of the 2000s in science and technology . | https://en.wikipedia.org/wiki/2000s_in_science_and_technology |
The 2002 Diaz pipeline incident, also known simply as the Holley chemical spill , was a chemical leak at the Diaz Chemical Corporation site in Holley , New York . On January 5th, 2002, at approximately 9:30 am, [ 1 ] a faulty reactor vessel burst open, along with its pipeline carrying chemicals underground from inside ... | https://en.wikipedia.org/wiki/2002_Diaz_pipeline_incident |
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Proposition 71 of 2004 (or the California Stem Cell Research and Cures Act ) is a law enacted by California voters to support stem cell research in the state. It was proposed by means of the initiativ... | https://en.wikipedia.org/wiki/2004_California_Proposition_71 |
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Missouri Constitutional Amendment 2 (The Missouri Stem Cell Research and Cures Initiative) was a state constitutional amendment initiative that concerned stem cell research and human cloning . It allows any stem cell research and therapy in the U.S. state of Missouri that is legal under federal law , including... | https://en.wikipedia.org/wiki/2006_Missouri_Amendment_2 |
The 2007 United Kingdom petrol contamination problem arose on 28 February 2007, when motorists in South East England reported that their cars were breaking down. This was caused by silicon contaminated unleaded petrol, sold by several supermarkets , that damaged the lambda sensors in engine management systems .
On 28 ... | https://en.wikipedia.org/wiki/2007_United_Kingdom_petrol_contamination |
2008 Chinese heparin adulteration , refers to heparin adulteration incidents that occurred in the United States of America in 2008. Pharmaceutical company Baxter International subcontracted the creation of precursor chemicals of heparin to Scientific Protein Laboratories , an American company with production facilities... | https://en.wikipedia.org/wiki/2008_Chinese_heparin_adulteration |
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Michigan Proposal 08-2 was a proposal to amend the Michigan Constitution to remove restrictions on stem cell research in Michigan while maintaining the ban on human cloning. Opponents argued that it would raise taxes. The proposal was passed on November 4, 2008, by voters by a 53–47% margin. [ 1 ]
The proposa... | https://en.wikipedia.org/wiki/2008_Michigan_Proposal_2 |
The 2008 submarine cable disruption refers to three separate incidents of major damage to submarine optical communication cables around the world. The first incident caused damage involving up to five high-speed Internet submarine communications cables in the Mediterranean Sea and Middle East from January 23 to Februar... | https://en.wikipedia.org/wiki/2008_submarine_cable_disruption |
The 2010 Biodiversity Target was an overall conservation target aiming to halt the decline of biodiversity by the end of 2010. The world largely failed to meet the target. [ 1 ]
It was first adopted by EU Heads of State at the EU Summit in Gothenburg, Sweden, in June 2001. They decided that "biodiversity decline shoul... | https://en.wikipedia.org/wiki/2010_Biodiversity_Target |
2010 KQ is a small asteroid -like object that has been discovered in an orbit about the Sun that is so similar to the Earth's orbit that scientists strongly suspect it to be a rocket stage that escaped years ago from the Earth–Moon system. [ 1 ] The object was discovered on May 16, 2010 by Richard Kowalski at the Catal... | https://en.wikipedia.org/wiki/2010_KQ |
This article is a summary of the 2010s in science and technology .
Big data and " Big Tech " saw an expansion in size and power in the 2010s, particularly FAANG corporations. The growing influence of "Big Tech" over cyberspace drew scrutiny and increased oversight from national governments. The G20 countries began clo... | https://en.wikipedia.org/wiki/2010s_in_science_and_technology |
2011 submarine cable disruption refers to two incidents of submarine communications cables cut off on 25 December 2011. The first cut off occurred to SEA-ME-WE 3 at Suez Canal , Egypt and the second cut off occurred to i2i which took place between Chennai , India and Singapore line. SEA-ME-WE 3 is the longest datacable... | https://en.wikipedia.org/wiki/2011_submarine_cable_disruption |
The 2012 Hyderabad Conference of the Parties to the UN Convention on Biological Diversity (CBD), also known as COP11, was held in Hyderabad, India . Environment ministers and forests ministers of about 194 countries attended the conference; international organizations like World Bank and the Asian Development Bank also... | https://en.wikipedia.org/wiki/2012_Hyderabad_Biodiversity_Conference |
The 2012 LinkedIn hack refers to the computer hacking of LinkedIn on June 5, 2012. Passwords for nearly 6.5 million user accounts were stolen. Yevgeniy Nikulin was convicted of the crime and sentenced to 88 months in prison.
Owners of the hacked accounts were unable to access their accounts. LinkedIn said, in an offic... | https://en.wikipedia.org/wiki/2012_LinkedIn_hack |
The 2012 National Reconnaissance Office space telescope donation to NASA was the declassification and donation to NASA of two identical space telescopes by the United States National Reconnaissance Office . The donation has been described by scientists as a substantial improvement over NASA's current Hubble Space Teles... | https://en.wikipedia.org/wiki/2012_National_Reconnaissance_Office_space_telescope_donation_to_NASA |
The 2014 Russian hacker password theft was an alleged hacking incident resulting in the possible theft of over 1.2 billion internet credentials, including usernames and passwords, with hundreds of millions of corresponding e-mail addresses. [ 1 ] The data breach was first reported by The New York Times after being alle... | https://en.wikipedia.org/wiki/2014_Russian_hacker_password_theft |
The 2014 Taiwanese adulterated oil scandal refers to an incident in 2014 when many edible oil manufacturers in Taiwan were found to have violated the law. The incident aroused widespread public attention on food safety issues, including the detection of several scandal of inferior oil products. [ 1 ]
Around 2009, an e... | https://en.wikipedia.org/wiki/2014_Taiwanese_adulterated_oil_scandal |
Gaia was a space observatory of the European Space Agency (ESA) that was launched in 2013 and operated until March 2025. The spacecraft was designed for astrometry : measuring the positions, distances and motions of stars with unprecedented precision, [ 5 ] [ 6 ] and the positions of exoplanets by measuring attributes ... | https://en.wikipedia.org/wiki/2015_HP116 |
2015 VW 168 is a trans-Neptunian object . [ 1 ]
in 2019 the Hubble Space Telescope discovered a 64km moon around 2015 VW 168 .
This astronomy -related article is a stub . You can help Wikipedia by expanding it . | https://en.wikipedia.org/wiki/2015_VW168 |
The 2016 United States wireless spectrum auction , officially known as Auction 1001 , allocated approximately 100 MHz of the United States Ultra High Frequency (UHF) spectrum formerly allocated to UHF television in the 600 MHz band. The spectrum auction and subsequent reallocations were authorized by Title VI (The Spec... | https://en.wikipedia.org/wiki/2016_United_States_wireless_spectrum_auction |
CloudPets were a line of Internet-connected soft toys manufactured by now defunct Spiral Toys that was the subject of numerous security vulnerabilities in February 2017. [ 1 ] [ 2 ] The plush teddy bear -style toys used Bluetooth to connect to a parent's smartphone to allow distant family members to send voice messages... | https://en.wikipedia.org/wiki/2017_CloudPets_data_breach |
The 2019 Kim Kim River toxic pollution is a water pollution incident that occurred on 7 March 2019 caused by illegal chemical waste dumping at the Kim Kim River in Pasir Gudang of Johor in Malaysia . The illegal dumping released toxic fumes, affecting 6,000 people and hospitalising 2,775. Most of the victims were scho... | https://en.wikipedia.org/wiki/2019_Kim_Kim_River_toxic_pollution |
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California Proposition 14 is a citizen-initiated ballot measure that appeared on the ballot in the 2020 California elections , for November 3, 2020. It authorizes state bonds to be issue... | https://en.wikipedia.org/wiki/2020_California_Proposition_14 |
The 2020 Iran explosions were a series of eleven explosions in Iran , including at an advanced centrifuge assembly facility, [ 1 ] alleged missile sites, [ 2 ] [ 3 ] [ 4 ] petrochemical centers, [ 5 ] power plants, [ 6 ] a nuclear enrichment facility and a medical clinic. [ 7 ] First reported on 25 June 2020, The Irani... | https://en.wikipedia.org/wiki/2020_Iran_explosions |
2020 SO [ a ] is a near-Earth object identified to be the Centaur upper stage used on 20 September 1966 to launch the Surveyor 2 spacecraft. The object was discovered by the Pan-STARRS 1 survey at the Haleakala Observatory on 17 September 2020. It was initially suspected to be an artificial object due to its low veloci... | https://en.wikipedia.org/wiki/2020_SO |
On July 15, 2020, between 20:00 and 22:00 UTC , 69 high-profile Twitter accounts were reportedly compromised by outside parties to promote a bitcoin scam . [ 1 ] [ 2 ] Twitter and other media sources confirmed that the perpetrators had gained access to Twitter's administrative tools so that they could alter the account... | https://en.wikipedia.org/wiki/2020_Twitter_account_hijacking |
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This article is a summary of the 2020s in science and technology . | https://en.wikipedia.org/wiki/2020s_in_science_and_technology |
A global wave of cyberattacks and data breaches began in January 2021 after four zero-day exploits were discovered in on-premises Microsoft Exchange Servers , giving attackers full access to user emails and passwords on affected servers, administrator privileges on the server, and access to connected devices on the sam... | https://en.wikipedia.org/wiki/2021_Microsoft_Exchange_Server_data_breach |
2022 UQ 1 was a minor planet provisional designation that was mistakenly given to the Lucy mission's Centaur upper stage booster during its Earth gravity assist flyby in October 2022. [ 1 ] The object passed about 9,100 km (5,700 mi) from the center of Earth (or an altitude of 2,700 km (1,700 mi) above the surface of E... | https://en.wikipedia.org/wiki/2022_UQ1 |
The 2022 United Nations Biodiversity Conference of the Parties ( COP15 ) to the UN Convention on Biological Diversity (CBD) was a conference held in Montreal , Canada , which led to the international agreement to protect 30% of land and oceans by 2030 ( 30 by 30 ) and the adoption of the Kunming-Montreal Global Biodive... | https://en.wikipedia.org/wiki/2022_United_Nations_Biodiversity_Conference |
On January 11, 2023, U.S. flights were grounded or delayed as the Federal Aviation Administration (FAA) attempted to fix a system outage. [ 1 ] [ 2 ] FAA paused all flight departures between 7:30 a.m. and 9 a.m. ET . [ 2 ] Flights already in the air were allowed to continue to their destinations. [ 1 ] Around 8:30 am. ... | https://en.wikipedia.org/wiki/2023_FAA_system_outage |
Discovered in May 2023, a critical vulnerability in the MOVEit managed file transfer software triggered a wave of cyberattacks and data breaches . [ 1 ] Exploited by the notorious ransomware group CL0P , the flaw enabled unauthorized access to sensitive databases , leading to the compromise of over 2,700 organizations ... | https://en.wikipedia.org/wiki/2023_MOVEit_data_breach |
On 19 July 2024, American cybersecurity company CrowdStrike distributed a faulty update to its Falcon Sensor security software that caused widespread problems with Microsoft Windows computers running the software. As a result, roughly 8.5 million systems crashed and were unable to properly restart [ 1 ] in what has bee... | https://en.wikipedia.org/wiki/2024_CrowdStrike-related_IT_outages |
The 2024 United Nations Biodiversity Conference of the Parties (COP16) to the UN Convention on Biological Diversity (CBD) was a conference that was held from 21 October to 1 November 2024, in Cali, Colombia . [ 1 ] [ 2 ] The monitoring framework agreed at the previous conference should allow the progress of the countri... | https://en.wikipedia.org/wiki/2024_United_Nations_Biodiversity_Conference |
20α,22 R -Dihydroxycholesterol , or (3β)-cholest-5-ene-3,20,22-triol is an endogenous , metabolic intermediate in the biosynthesis of the steroid hormones from cholesterol . [ 1 ] [ 2 ] Cholesterol ((3β)-cholest-5-en-3-ol) is hydroxylated by cholesterol side-chain cleavage enzyme (P450scc) to form 22 R -hydroxycholeste... | https://en.wikipedia.org/wiki/20α,22R-Dihydroxycholesterol |
20β-Dihydroprogesterone ( 20β-DHP ), also known as 20β-hydroxyprogesterone ( 20β-OHP ), is an endogenous metabolite of progesterone which is formed by 20β-hydroxysteroid dehydrogenase (20β-HSD). [ 1 ] It is a progestogen similarly to progesterone, with about 20 to 50% of the progestogenic activity of progesterone. [ 1 ... | https://en.wikipedia.org/wiki/20β-Dihydroprogesterone |
21-Crown-7 is an organic compound with the formula [C 2 H 4 O] 7 and the IUPAC name 1,4,7,10,13,16,19-heptaoxacycloheneicosane. Similar to other crown ethers , 21-crown-7 functions as a ligand for certain metal cations, with a specific affinity for caesium cations. [ 1 ] The dipole moment of 21-crown-7 varies depending... | https://en.wikipedia.org/wiki/21-Crown-7 |
21st Century Medicine ( 21CM ) is a California cryobiological research company which has as its primary focus the development of perfusates and protocols for viable long-term cryopreservation of human organs , tissues and cells at temperatures below −100 °C through the use of vitrification . 21CM was founded in 1993.
... | https://en.wikipedia.org/wiki/21st_Century_Medicine |
22-Dihydroergocalciferol is a form of vitamin D , also known as vitamin D 4 . [ 2 ] It has the systematic name (5 Z ,7 E )-(3 S )-9,10-seco-5,7,10(19)-ergostatrien-3-ol. [ 1 ]
Vitamin D 4 is found in certain mushrooms, being produced from ergosta-5,7-dienol (22,23-dihydroergosterol) instead of ergosterol. [ 3 ]
This ... | https://en.wikipedia.org/wiki/22-Dihydroergocalciferol |
22 R -Hydroxycholesterol , or (3β)-cholest-5-ene-3,22-diol is an endogenous , metabolic intermediate in the biosynthesis of the steroid hormones from cholesterol . [ 1 ] [ 2 ] Cholesterol ((3β)-cholest-5-en-3-ol) is hydroxylated by cholesterol side-chain cleavage enzyme (P450scc) to form 22 R -hydroxycholesterol, which... | https://en.wikipedia.org/wiki/22R-Hydroxycholesterol |
24-isopropyl cholestane is an organic molecule produced by specific sponges , protists [ 1 ] and marine algae . [ 2 ] The identification of this molecule at high abundances in Neoproterozoic rocks has been interpreted to reflect the presence of multicellular life prior to the rapid diversification and radiation of life... | https://en.wikipedia.org/wiki/24-Isopropylcholestane |
24-Norcholestane , a steroid derivative, is used as a biomarker to constrain the source age of sediments and petroleum through the ratio between 24-norcholestane and 27-norcholestane (24-norcholestane ratio, NCR), especially when used with other age diagnostic biomarkers, like oleanane . [ 1 ] While the origins of this... | https://en.wikipedia.org/wiki/24-Norcholestane |
24- n -Propylcholestane is a sterane biomarker molecule often found in marine source rocks. [ 1 ] [ 2 ] It is a C 30 molecule, meaning that it is composed of thirty carbon atoms, and is one of the leading ways to distinguish a marine source rock from a terrigenous sample. It is composed of three six-carbon rings and on... | https://en.wikipedia.org/wiki/24-n-Propylcholestane |
In geometry , the 25 great circles of the spherical octahedron is an arrangement of 25 great circles in octahedral symmetry . [ 1 ] It was first identified by Buckminster Fuller and is used in construction of geodesic domes .
The 25 great circles can be seen in 3 sets: 12, 9, and 4, each representing edges of a polyhe... | https://en.wikipedia.org/wiki/25_great_circles_of_the_spherical_octahedron |
Johnston Atoll, Pacific Ocean (1971–2001); Okinawa, Japan (1962–1971);
The 267th Chemical Company was a military unit of the U.S. Army Chemical Corps responsible for the surety of chemical warfare agents dubbed "RED HAT" deployed to the Islands of Okinawa , Japan and subsequently Johnston Atoll in the Pacific Ocean . ... | https://en.wikipedia.org/wiki/267th_Chemical_Company |
27-Norcholestane , is a chemical compound with the formula C 26 H 46 , that is a steroid derivative. 27-Norcholestane is used as a biomarker to constrain the source age of sediments and petroleum through the ratio between 24-norcholestane and 27-norcholestane (norcholestane ratio, NCR), especially when used with other ... | https://en.wikipedia.org/wiki/27-Norcholestane |
279 ( two hundred [and] seventy-nine ) is the natural number following 278 and preceding 280 . | https://en.wikipedia.org/wiki/279_(number) |
2A peptides are a class of 18–22 aa -long peptides , which can induce ribosomal skipping during translation of a protein in a biological cell. [ 1 ] [ 2 ] These peptides share a core sequence motif of DxExNPGP , and are found in a wide range of viral families . 2A peptides can be introduced artificially to help generat... | https://en.wikipedia.org/wiki/2A_peptides |
2D Materials is a monthly peer-reviewed scientific journal published by IOP Publishing . It covers fundamental and applied research on graphene and related two-dimensional materials . The editor-in-chief is Wencai Ren ( Chinese Academy of Sciences ). [ 1 ]
The journal is abstracted and indexed in:
According to the Jo... | https://en.wikipedia.org/wiki/2D_Materials_(journal) |
Two-dimensional silica ( 2D silica ) is a layered polymorph of silicon dioxide . Two varieties of 2D silica, both of hexagonal crystal symmetry, have been grown so far on various metal substrates. One is based on SiO 4 tetrahedra, which are covalently bonded to the substrate. The second comprises graphene -like fully s... | https://en.wikipedia.org/wiki/2D_silica |
The 2G spectrum case was a political controversy in which politicians and private officials of the United Progressive Alliance (UPA) coalition government India were allegedly involved in [ 1 ] selling or allotting 122 2G spectrum licenses on conditions that provided an advantage to specific telecom operators. A. Raja ,... | https://en.wikipedia.org/wiki/2G_spectrum_case |
The 2R hypothesis or Ohno's hypothesis , first proposed by Susumu Ohno in 1970, [ 1 ] is a hypothesis that the genomes of the early vertebrate lineage underwent two whole genome duplications , and thus modern vertebrate genomes reflect paleopolyploidy . The name derives from the 2 r ounds of duplication originally hyp... | https://en.wikipedia.org/wiki/2R_hypothesis |
2Sum [ 1 ] is a floating-point algorithm for computing the exact round-off error in a floating-point addition operation.
2Sum and its variant Fast2Sum were first published by Ole Møller in 1965. [ 2 ] Fast2Sum is often used implicitly in other algorithms such as compensated summation algorithms ; [ 1 ] Kahan's summati... | https://en.wikipedia.org/wiki/2Sum |
2 Base Encoding , also called SOLiD ( sequencing by oligonucleotide ligation and detection ), is a next-generation sequencing technology developed by Applied Biosystems and has been commercially available since 2008. These technologies generate hundreds of thousands of small sequence reads at one time. Well-known examp... | https://en.wikipedia.org/wiki/2_base_encoding |
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