Pyridazine

Pyridimine dimer

Pyrimidine biosynthesis

Pyrite disease

Pyrgus sidae

Ball-and-stick model of pyridoxal

Pyrimidinyl-piperazine

Pyrimidine oxygenase

Pyriprole

changed

Pyrinioides sinuosa

Insecta

Pyridoxamine

Pyrites Island

Пирятин

Pyrinuron

Pyridoxal Phosphate

Pyrinuron (Pyriminil, Vacor) is a chemical compound formerly used as a rodenticide. Commercial distribution was voluntarily suspended in 1979 and it is not approved by the Environmental Protection Agency for use in the United States. If it is ingested by humans in high doses, it may selectively destroy insulin-producing beta cells in the pancreas causing type 1 diabetes.

Pyridoxal 5'-phosphate synthase (glutamine hydrolyzing) (EC 4.3.3.6, PdxST) is an enzyme with systematic name D-ribose 5-phosphate,D-glyceraldehyde 3-phosphate pyridoxal 5'-phosphate-lyase.

Pyriglena

Pyridoxine (Vitamin B6)

Pyrithione is the common name of an organosulfur compound with molecular formula C5H5NOS, chosen as an abbreviation of pyridinethione, and found in the Persian shallot. It exists as a pair of tautomers, the major form being the thione 1-hydroxy-2(1H)-pyridinethione and the minor form being the thiol 2-mercaptopyridine N-oxide; it crystallises in the thione form.

Pyrinioides sinuosus

Pyriminil

Pyrimidine-5'-nucleotide phosphoribo(deoxyribo)hydrolase

Pyripnoa is a genus of moths of the Noctuidae family.

Pyriatyn (Ukrainian: Пирятин) is a city in Poltava Oblast, Ukraine. Its population was 15,882 (2015 est.)

Pyridoxal phosphate (PLP, pyridoxal 5'-phosphate, P5P), the active form of vitamin B6, is a coenzyme in a variety of enzymatic reactions. The Enzyme commission has catalogued more than 140 PLP-dependent activities, corresponding to ~4% of all classified activities. The versatility of PLP arises from its ability to covalently bind the substrate, and then to act as an electrophilic catalyst, thereby stabilizing different types of carbanionic reaction intermediates.

Pyrimidal neuron

Pyridoxal

Pyrianoreina hovorei

In enzymology, a pyrithiamine deaminase (EC 3.5.4.20) is an enzyme that catalyzes the chemical reaction1-(4-amino-2-methylpyrimid-5-ylmethyl)-3-(beta-hydroxyethyl)-2- methylpyridinium bromide + H2O ⇌ {\displaystyle \rightleftharpoons } 1-(4-hydroxy-2-methylpyrimid-5-ylmethyl)-3-(beta-hydroxyethyl)-2- methylpyridinium bromide + NH3The 3 substrates of this enzyme are 1-(4-amino-2-methylpyrimid-5-ylmethyl)-3-(beta-hydroxyethyl)-2-, methylpyridinium bromide, and H2O, whereas its 3 products are 1-(4-hydroxy-2-methylpyrimid-5-ylmethyl)-3-(beta-hydroxyethyl)-2-, methylpyridinium bromide, and NH3.This enzyme belongs to the family of hydrolases, those acting on carbon-nitrogen bonds other than peptide bonds, specifically in cyclic amidines. The systematic name of this enzyme class is 1-(4-amino-2-methylpyrimid-5-ylmethyl)-3-(beta-hydroxyethyl)-2-methy lpyridinium-bromide aminohydrolase.

Pyrisitia dina

P. sinuosus

*Terias tenella f. jacarepaguana (d'Almeida, 1921)

Pyrimidodiazepine synthase

Pyrinistab

Pyrinioides sinuosus is a species of moth of the Thyrididae family. It is found in Taiwan, Japan, Burma and India.

PAAD_DAPIN

Pyrimidine biosynthesis occurs both in the body and through organic synthesis.

Animalia

In enzymology, a pyridoxine 4-dehydrogenase (EC 1.1.1.65) is an enzyme that catalyzes the chemical reactionpyridoxine + NADP+ ⇌ {\displaystyle \rightleftharpoons } pyridoxal + NADPH + H+Thus, the two substrates of this enzyme are pyridoxine and NADP+, whereas its 3 products are pyridoxal, NADPH, and H+.This enzyme belongs to the family of oxidoreductases, specifically those acting on the CH-OH group of donor with NAD+ or NADP+ as acceptor. The systematic name of this enzyme class is pyridoxine:NADP+ 4-oxidoreductase. Other names in common use include pyridoxin dehydrogenase, pyridoxol dehydrogenase, and pyridoxine dehydrogenase. This enzyme participates in vitamin B6 metabolism.

Pyrianoreina

Pyridoxine-dependent seizure

Pyridoxamine-phosphate oxidase

Chemical structure of pyriproxyfen

Pyridoxine 5’-phosphate oxidase is an enzyme that catalyzes several reactions in the vitamin B6 metabolism pathway. Pyridoxine-5-P oxidase catalyzes the terminal step (also the rate-limiting step) in vitamin B6 metabolism, the biosynthesis of pyridoxal-5’-phosphate, the biologically active form of vitamin B6 which acts as an essential cofactor. Pyridoxine 5’-phosphate oxidase is a member of the enzyme class oxidases, or more specifically, oxidoreductases.

Pyrimidine molecule

Pyricularia grisea

pyrimidodiazepine synthase

Pyriproxyfen

Pyridoxal kinase

Pyrimidine analogue

Pyrimidine nucleoside

Pyrilia

Pyridoxal:NAD+ 4-oxidoreductase

Pyrgus wyandot

Mykola Kupriyan

5,5'-[dithiobis(methylene)]bis[4-(hydroxymethyl)-2-methylpyridin-3-ol]

P. warrenensis

Pyridinium chlorochromate (PCC) is a yellow-orange salt with the formula [C5H5NH][CrO3Cl]. It is a reagent in organic synthesis used primarily for oxidation of alcohols to form carbonyls. A variety of related compounds are known with similar reactivity. Although no longer widely used, PCC offers the advantage of the selective oxidation of alcohols to aldehydes or ketones, whereas many other reagents are less selective.

Pyridox

P. incensata

Arthropoda

Pyridinedicarbothioic acid

Pyrgus tucusa

Pyrimidine oxygenase (EC 1.14.99.46, RutA) is an enzyme with systematic name uracil,FMNH2:oxygen oxidoreductase (uracil hydroxylating, ring-opening) . This enzyme catalyses the following chemical reaction(1) uracil + FMNH2 + O2 ⇌ {\displaystyle \rightleftharpoons } (Z)-3-ureidoacrylate peracid + FMN(2) thymine + FMNH2 + O2 ⇌ {\displaystyle \rightleftharpoons } (Z)-2-methylureidoacrylate peracid + FMNIn vitro the product (Z)-3-ureidoacrylate peracid is spontaneously reduced to ureidoacrylate.

Pyrimidine dimers

Pyrilamine

N06

A pyridotriazolodiazepine is a heterocyclic compound containing pyridine and triazole rings fused to a diazepine ring.Pyridotriazolodiazepines forms the central structure of zapizolam. Zapizolam is poorly researched, but probably it is a sedative and/or anxiolytic, like other benzodiazepine derivatives, especially triazolobenzodiazepines (such as alprazolam).

Pyrisitia nise
*Eurema frieda (Baumann & Reissinger, 1969)

In enzymology, a pyrimidodiazepine synthase (EC 1.5.4.1) is an enzyme that catalyzes the chemical reactiona pyrimidodiazepine + glutathione disulfide + H2O ⇌ {\displaystyle \rightleftharpoons } 6-pyruvoyltetrahydropterin + 2 glutathioneThe 3 substrates of this enzyme are pyrimidodiazepine, glutathione disulfide, and H2O, whereas its two products are 6-pyruvoyltetrahydropterin and glutathione.This enzyme belongs to the family of oxidoreductases, specifically those acting on the CH-NH group of donors with a disulfide as acceptor. The systematic name of this enzyme class is pyrimidodiazepine:glutathione-disulfide oxidoreductase (ring-opening, cyclizing). Other names in common use include PDA synthase, pyrimidodiazepine:oxidized-glutathione oxidoreductase (ring-opening,, and cyclizing). This enzyme participates in glutathione metabolism.

Pyridinium chlorochromate

Pyrilium

Pyriatyn Raion (Ukrainian: Пирятинський район) is a raion (district) in the central Ukrainian province of Poltava. The raion's administrative center is the urban-type settlement of Pyriatyn.

*Terias joannisi ab. obliterata (Dufrane, 1947)

Pyridyl

*Papilio nise (Cramer, [1775])
*Pieris neda (Godart, 1819)
*Eurema nise
*Eurema neda
*Eurema sulla (Weymer, 1890)
*Terias porteri (d'Almeida, 1930)
*Terias joannisi (Dufrane, 1947)
*Terias joannisi ab. minor (Dufrane, 1947)
*Terias joannisi ab. marginata (Dufrane, 1947)
*Terias joannisi ab. obliterata (Dufrane, 1947)
*Terias tenella (Boisduval, 1836)
*Terias nisella (Felder, 1862)
*Terias perimede (Prittwitz, 1865)
*Terias tenella ab. alcides (d'Almeida, 1913)
*Terias tenella f. germana (d'Almeida, 1921)
*Terias tenella f. jacarepaguana (d'Almeida, 1921)
*Terias tenella f. panopea (d'Almeida, 1921)
*Terias lepidula (d'Almeida, 1921)
*Terias thymetus f. cordobensis (Köhler, 1923)
*Terias tenella ab. cissa (d'Almeida, 1928)
*Terias thymetus f. formosanus (Jörgensen, 1935)
*Eurema larae f. ricardi (Torre & Alayo, 1953)
*Terias nelphe (R. Felder, 1869)
*Eurema venustula (Staudinger, 1876)
*Terias linda (Edwards, 1884)
*Terias neda f. fusca (Giacomelli, 1915)
*Terias tenella ab. argia (d'Almeida, 1928)
*Eurema frieda (Baumann & Reissinger, 1969)
*Eurema frieda f. discopunctata (Baumann & Reissinger, 1969)

Pyridinoline, also known as Hydroxylysylpyridinoline, is a fluorescent cross-linking compound of collagen fibers. Crosslinks in collagen and elastin are derived from lysyl and hydroxylysyl residues, a process catalyzed by lysyl oxidase. Fujimoto and colleagues first described the isolation and characterization of a fluorescent material in bovine Achilles tendon collagen and termed it pyridinoline. It is reported to be present in collagen of bone and cartilage, but is absent in collagen of skin. It is not present in newly synthesized collagen and is formed from aldimine cross-links during maturation of collagen fibers.Pyridinoline and deoxypyridinoline were found to be released into the blood during bone degradation and rapidly exereted in the urine. In a preliminary study, both these compounds were proposed as a marker for metastatic bone tumor in patients with prostate cancer.

1-[2,6-dichloro-4-(trifluoromethyl)phenyl]-4-[(difluoromethyl)thio]-5-[(2-pyridinylmethyl)amino]-1H-pyrazole-3-carbonitrile

Pyrimidine oxygenase (EC 1.14.99.46, RutA) is an enzyme with systematic name uracil,FMNH2:oxygen oxidoreductase (uracil hydroxylating, ring-opening) .

*Terias tenella ab. cissa (d'Almeida, 1928)

Pyridazil

Pyridazine molecule

Pyridiate

Pyridoxine HCL

Pyritinol

Pyripnoa

Pyridamal 100

Pyrisitia messalina

Pyriform fossa

Pyriproxyfen is a pyridine-based pesticide which is found to be effective against a variety of arthropoda. It was introduced to the US in 1996, to protect cotton crops against whitefly. It has also been found useful for protecting other crops. It is also used as a prevention for flea control on household pets, for killing indoor and outdoor ants and roaches. Methods of application include aerosols, bait, carpet powders, foggers, shampoos and pet collars.Pyriproxyfen is a juvenile hormone analog and an insect growth regulator. It prevents larvae from developing into adulthood and thus rendering them unable to reproduce.In the US, pyriproxyfen is often marketed under the trade name Nylar. In Europe, pyriproxyfen is known under the brand names Cyclio (Virbac) and Exil Flea Free TwinSpot (Emax).

Ball-and-stick model of the chlorochromate anion

Pyrihos

Pyriatyn

Pyridoxal 5-phosphate

Pyrgus sidae, the yellow-banded skipper, is a species of skipper (family Hesperiidae). It is found in from the Iberian Peninsula (only an isolated occurrence in the Sierra de Gredos) through southern and eastern Europe , southeast France, the northwestern coastal areas of central Italy, then Istria (Slovenia and Croatia) and the Balkan peninsula, across Turkey, Transcaucasia, to Iran and Afghanistan.

Pyrithione zinc

Pyrinia is a genus of moth in the family Geometridae.

Pyriglena atra

C=black, H=white, N=blue

Pyritz

Pyriglena leucoptera

Pyrimidine analog

Pyridines

pyridoxal 4-dehydrogenase

Pyriglena pacifica

First mentioned

Pyriprole 3D ball.png

In enzymology, a pyrimidodiazepine synthase (EC 1.5.4.1) is an enzyme that catalyzes the chemical reactiona pyrimidodiazepine + glutathione disulfide + H2O ⇌ {\displaystyle \rightleftharpoons } 6-pyruvoyltetrahydropterin + 2 glutathioneThe 3 substrates of this enzyme are pyrimidodiazepine, glutathione disulfide, and H2O, whereas its two products are 6-pyruvoyltetrahydropterin and glutathione.This enzyme belongs to the family of oxidoreductases, specifically those acting on the CH-NH group of donors with a disulfide as acceptor.

Pyritis is a genus of hoverfly, from the family Syrphidae, in the order Diptera.

Pyrgus textor

4,6-Dimethyl-N-phenylpyrimidin-2-amine

combo

Pyrimidine

Pyridoxamine--pyruvate transaminase

left

Pyrinia incensata is a species of moth of the family Geometridae. It was described by Walker in 1863. It is found in Brazil (Para).Adults are bright ochraceous, the wings minutely red-speckled. The exterior line is red, straight, oblique and well defined and the submarginal line is red, indistinct and nearly obsolete in the forewings. The forewings are slightly acute, with a hyaline basal dot.

Coat of Arms of Pyriatynskiy Raion in Poltava Oblast.png

Pyritzans

Pyridine nucleotide transhydrogenase may stand forNAD(P)+ transhydrogenase (Re/Si-specific)NAD(P)+ transhydrogenase (Si-specific)

Pyridoxine

Pyrimidine dimers are molecular lesions formed from thymine or cytosine bases in DNA via photochemical reactions. Ultraviolet light induces the formation of covalent linkages by reactions localized on the C=C double bonds. In dsRNA (double-stranded RNA), uracil dimers may also accumulate as a result of UV radiation. Two common UV products are cyclobutane pyrimidine dimers (CPDs, including thymine dimers) and 6,4 photoproducts.

Pyridinium is the cationic conjugate acid of pyridine. This can either be due to protonation of the ring nitrogen or because of addition of a substituent to the ring nitrogen, typically via alkylation. The lone pair of electrons on the nitrogen atom of pyridine is not delocalized, and thus pyridine can be protonated easily. Pyridine is often used as an organic base in chemical reactions, thus the pyridinium ion is produced as the counter ion to the leaving group in the reaction.

m-Diazine

Mimosa yellow

Pyrinia incensata

Pyridoxine:oxygen 4-oxidoreductase

Pyridoxine hydrochloride

3-Hydroxy-5-(hydroxymethyl)-2-methylpyridine-4-carbaldehyde

Pyridinium dichromate

AX26

3-(4-Nitrophenyl)-1-(pyridin-3-ylmethyl)urea

Pyriglena leuconota

Pyridoxal-5'-phosphate

Pyridinium compounds

*Terias tenella f. panopea (d'Almeida, 1921)

Pyridoxal is one form of vitamin B6.Some medically relevant bacteria, such as those in the genera Granulicatella and Abiotrophia, require pyridoxal for growth. This nutritional requirement can lead to the culture phenomenon of satellite growth.

P. hovorei

4-Pyrimidone

Pyrimidine-nucleoside phosphorylase

Pyrianoreina piranga

Oblast

Pyrisitia nise, the mimosa yellow, is a butterfly in the family Pieridae. It is found from Argentina north to the Texas Gulf Coast and throughout central and southern Florida, northward to the Tennessee Valley. It is an occasional stray to central Texas and south-eastern Arizona and rarely to southern California, southern Colorado and Kansas. The habitat consists of brushy woodland edges.The wingspan is 29–51 mm (1.1–2.0 in). Both sexes are yellow. The upperside of the forewing has narrow black outer edges. Black margins of the hindwing are uncommon in males, but always absent in females. Adults are on wing from May to August in southern Florida, September to November in southern Texas and all year round in the tropics. Adults feed on flower nectar.The larvae feed on Mimosa pudica.

Pyrimidine analogues are nucleoside analog antimetabolites which mimic the structure of metabolic pyrimidines.

Pyridine-4-carboxylic acid

Ball-and-stick model of the pyriprole molecule

Diclegis, Bendectin, Debendox, Lenotan, Merbental, Diclectin

Pyridoxol

Pyridoxine 5'-phosphate oxidase

In enzymology, a pyridine N-methyltransferase (EC 2.1.1.87) is an enzyme that catalyzes the chemical reactionS-adenosyl-L-methionine + pyridine ⇌ {\displaystyle \rightleftharpoons } S-adenosyl-L-homocysteine + N-methylpyridiniumThus, the two substrates of this enzyme are S-adenosyl methionine and pyridine, whereas its two products are S-adenosylhomocysteine and N-methylpyridinium.This enzyme belongs to the family of transferases, specifically those transferring one-carbon group methyltransferases.

The pyrite group of minerals is a set of cubic crystal system minerals with diploidal structure. Each metallic element is bonded to six "dumbbell" pairs of non-metallic elements and each "dumbbell" pair is bonded to six metal atoms.The group is named for its most common member, pyrite (fool's gold), which is sometimes explicitly distinguished from the group's other members as iron pyrite.Pyrrhotite (magnetic pyrite) is magnetic, and is composed of iron and sulfur, but it has a different structure and is not in the pyrite group.

Piryatinskyi Raion

Chemical structure of pyridinium chlorochromate
PCC

In enzymology, a pyrimidine-nucleoside phosphorylase (EC 2.4.2.2) is an enzyme that catalyzes the chemical reactiona pyrimidine nucleoside + phosphate ⇌ {\displaystyle \rightleftharpoons } a pyrimidine base + alpha-D-ribose 1-phosphateThus, the two substrates of this enzyme are pyrimidine nucleoside and phosphate, whereas its two products are pyrimidine base and alpha-D-ribose 1-phosphate.This enzyme belongs to the family of glycosyltransferases, specifically the pentosyltransferases. The systematic name of this enzyme class is pyrimidine-nucleoside:phosphate alpha-D-ribosyltransferase. This enzyme is also called Py-NPase. This enzyme participates in pyrimidine metabolism.

In enzymology, a pyrimidine-deoxynucleoside 2'-dioxygenase (EC 1.14.11.3) is an enzyme that catalyzes the chemical reaction2'-deoxyuridine + 2-oxoglutarate + O2 ⇌ {\displaystyle \rightleftharpoons } uridine + succinate + CO2The 3 substrates of this enzyme are 2'-deoxyuridine, 2-oxoglutarate, and O2, whereas its 3 products are uridine, succinate, and CO2.This enzyme belongs to the family of oxidoreductases, specifically those acting on paired donors, with O2 as oxidant and incorporation or reduction of oxygen.

Compatible

1-(2-Pyridinyl)piperazine is a chemical compound and piperazine derivative. Some derivatives of this substance are known to act as potent and selective α2-adrenergic receptor antagonists, such as 1-(3-fluoro-2-pyridinyl)piperazine.A few pyridinylpiperazine derivatives are drugs, including:Azaperone — antipsychoticAtevirdine — antiretroviralDelavirdine — antiretroviralMirtazapine — antidepressant

Pyridine-oxide

Pyrimethanil

Pyric

Oral

Pyridoxine:NADP+ 4-oxidoreductase

Pyriel

pyrimidine-5'-nucleotide nucleosidase

Pyrimidine 2D aromatic full.svg

In enzymology, a pyrimidine-deoxynucleoside 2'-dioxygenase (EC 1.14.11.3) is an enzyme that catalyzes the chemical reaction2'-deoxyuridine + 2-oxoglutarate + O2 ⇌ {\displaystyle \rightleftharpoons } uridine + succinate + CO2The 3 substrates of this enzyme are 2'-deoxyuridine, 2-oxoglutarate, and O2, whereas its 3 products are uridine, succinate, and CO2.This enzyme belongs to the family of oxidoreductases, specifically those acting on paired donors, with O2 as oxidant and incorporation or reduction of oxygen. The oxygen incorporated need not be derived from O2 with 2-oxoglutarate as one donor, and incorporation of one atom o oxygen into each donor. The systematic name of this enzyme class is 2'-deoxyuridine,2-oxoglutarate:oxygen oxidoreductase (2'-hydroxylating). Other names in common use include deoxyuridine 2'-dioxygenase, deoxyuridine 2'-hydroxylase, pyrimidine deoxyribonucleoside 2'-hydroxylase, thymidine 2'-dioxygenase, thymidine 2'-hydroxylase, thymidine 2-oxoglutarate dioxygenase, and thymidine dioxygenase. It has 2 cofactors: iron, and Ascorbate.

Pyrimethanil is a broad spectrum fungicide often applied to seeds. It inhibits methionine biosynthesis, thus affecting protein formation and subsequent cell division. Pyrimethanil works best on young fungus infestations.

This page provides supplementary chemical data on pyridine.

Orthodiazine

A pyrheliometer is an instrument for measurement of direct beam solar irradiance. Sunlight enters the instrument through a window and is directed onto a thermopile which converts heat to an electrical signal that can be recorded. The signal voltage is converted via a formula to measure watts per square metre. It is used with a solar tracking system to keep the instrument aimed at the sun. A pyrheliometer is often used in the same setup with a pyranometer.

Pyrimidine metabolism

*Terias joannisi ab. marginata (Dufrane, 1947)

Pyrinioides

Pyrinae

Pyrinazine

Pyrites Island is the largest of three small islands lying northeast of Gam Point and forming the east side of Esther Harbor, off the north coast of King George Island in the South Shetland Islands. In 1913–14, the rocky extremity of Gam Point and the adjoining islands to the northwest and southeast were named Esther, Pyritis (sic) or Pyritic Islands by Scottish geologist David Ferguson, who reported they were composed of pyrites and vein quartz.

Pyriatyn Airport

Pyrimethanil Structure V.1.svg

Pyridyne

Ukraine Poltava Oblast

Pyrichos

Pyritohedral group

Pyridazine is a heterocyclic organic compound with the molecular formula (CH)4N2. It contains a six-membered ring with two adjacent nitrogen atoms, and is aromatic. It is a colorless liquid with a boiling point of 208 °C. It is isomeric with two other (CH)4N2 rings, pyrimidine and pyrazine.

Pyridyne in chemistry is the pyridine analogue of benzyne. This reactive intermediate is of some importance to scientific research. Pyridynes are the class of compounds sharing the pyridyne building motive. Two isomers exist, the 2,3-pyridine (2,3-didehydropyridine) and the 3,4-pyridyne (3,4-didehydropyridine). The reaction of 3-bromo-4-chloropyridine with furan and lithium amalgam gives 1,4-epoxy-dihydroquinoline through the 2,3-pyridyne intermediate. The reaction of 4-bromopyridine with sodium in liquid ammonia gives both 3-aminopyridine and 4-aminopyridine through the 3,4-pyridyne intermediate and an E1cB-elimination reaction.

Pyrinees Atlantiques

Pyrimidinetrione

Pyrilia barrabandi

Pyrimidine dimer DNA-glycosylase

In enzymology, a pyridoxal kinase (EC 2.7.1.35) is an enzyme that catalyzes the chemical reactionATP + pyridoxal ⇌ {\displaystyle \rightleftharpoons } ADP + pyridoxal 5'-phosphateThus, the two substrates of this enzyme are ATP and pyridoxal, whereas its two products are ADP and pyridoxal 5'-phosphate.This enzyme belongs to the family of transferases, specifically those transferring phosphorus-containing groups (phosphotransferases) with an alcohol group as acceptor. The systematic name of this enzyme class is ATP:pyridoxal 5'-phosphotransferase. Other names in common use include pyridoxal kinase (phosphorylating), pyridoxal 5-phosphate-kinase, pyridoxal phosphokinase, and pyridoxine kinase. This enzyme participates in vitamin B6 metabolism.

Pyrgus syrithtus

Pyriform lobe

Pyriform aperture

Pyridoxamine—pyruvate transaminase

pyridine N-methyltransferase

2-[1-(4-Phenoxyphenoxy)propan-2-yloxy]pyridine

Pyrinia

Pyrisitia proterpia

Pyridoxine HCl

Prac-tic

pyridoxamine-pyruvate transaminase

Martins & Galileo, 2008

Pyridoxamine-oxaloacetate transaminase

Pyrithione

Pyridine-4-carboxamide

Pyridoxal 5'-phosphate synthase

Pyrimids

Pyridinium

Pyrilia aurantiocephala i

Pyrimidine dimers are molecular lesions formed from thymine or cytosine bases in DNA via photochemical reactions. Ultraviolet light induces the formation of covalent linkages by reactions localized on the C=C double bonds. In dsRNA (double-stranded RNA), uracil dimers may also accumulate as a result of UV radiation. Two common UV products are cyclobutane pyrimidine dimers (CPDs, including thymine dimers) and 6,4 photoproducts. These premutagenic lesions alter the structure of DNA and consequently inhibit polymerases and arrest replication. Dimers may be repaired by photoreactivation or nucleotide excision repair, but unrepaired dimers are mutagenic. Pyrimidine dimers are the primary cause of melanomas in humans.

Pyridoxine deficiency

In enzymology, a pyrithiamine deaminase (EC 3.5.4.20) is an enzyme that catalyzes the chemical reaction1-(4-amino-2-methylpyrimid-5-ylmethyl)-3-(beta-hydroxyethyl)-2- methylpyridinium bromide + H2O ⇌ {\displaystyle \rightleftharpoons } 1-(4-hydroxy-2-methylpyrimid-5-ylmethyl)-3-(beta-hydroxyethyl)-2- methylpyridinium bromide + NH3The 3 substrates of this enzyme are 1-(4-amino-2-methylpyrimid-5-ylmethyl)-3-(beta-hydroxyethyl)-2-, methylpyridinium bromide, and H2O, whereas its 3 products are 1-(4-hydroxy-2-methylpyrimid-5-ylmethyl)-3-(beta-hydroxyethyl)-2-, methylpyridinium bromide, and NH3.This enzyme belongs to the family of hydrolases, those acting on carbon-nitrogen bonds other than peptide bonds, specifically in cyclic amidines.

Pyrite group

Pyridoxine/doxylamine, sold under the brand name Diclectin among others, is a combination of pyridoxine hydrochloride (vitamin B6) and doxylamine succinate prescribed for the management of nausea and vomiting of pregnancy (morning sickness).

Pyrgus warrenensis

Pyridone

Pyridine nucleotide transhydrogenase

Pyridinethiol

*Terias neda f. fusca (Giacomelli, 1915)

Pyrimidine phosphorylase (disambiguation)

(4-formyl-5-hydroxy-6-methylpyridin-3-yl)methyl phosphate

Pyrilia pulchra

Pyrilia vulturina

Pyrimidinediones are a class of chemical compounds characterized by a pyrimidine ring substituted with two carbonyl groups.Examples include naturally occurring metabolites:and drugs:FluorouracilIdoxuridinePrimidoneTrifluridine

Pyridinecarboxaldehyde

In enzymology, a pyridoxal phosphatase (EC 3.1.3.74) is an enzyme that catalyzes the chemical reactionpyridoxal 5'-phosphate + H2O ⇌ {\displaystyle \rightleftharpoons } pyridoxal + phosphateThus, the two substrates of this enzyme are pyridoxal 5'-phosphate and H2O, whereas its two products are pyridoxal and phosphate.This enzyme belongs to the family of hydrolases, specifically those acting on phosphoric monoester bonds.

thione form on the left, thiol form on the right

Pyrigesic

Pyrilamine maleate

Pyridoxine-dependent epilepsy

File:Pyratyn coat.png

Pyriprole (trade name Prac-tic) is for veterinary use on dogs against external parasites such as fleas and ticks.Pyriprole is a phenylpyrazole derivative similar to fipronil. Although recently introduced (in the 2000s) and still under patent protection it is a "classic" insecticide. So far it is only approved in the EU and a few other countries for use on dogs. It is not approved for use on cats or livestock. It has not been introduced as an agricultural or hygiene pesticide.Pyriprole applied as a spot-on is highly effective against fleas and several ticks species. Efficacy against fleas is comparable to that of other modern insecticidal active ingredients such as fipronil, imidacloprid, spinetoram or spinosad. As most flea spot-ons it controls existing flea and tick infestations in about 1 to 2 days, and provides about 4 weeks protection against re-infestations.

Pyridoxine/doxylamine

*Terias tenella ab. argia (d'Almeida, 1928)

In enzymology, a pyridoxal oxidase (EC 1.2.3.8) is an enzyme that catalyzes the chemical reactionpyridoxal + H2O + O2 ⇌ {\displaystyle \rightleftharpoons } 4-pyridoxate + (?)The 3 substrates of this enzyme are pyridoxal, H2O, and O2, whereas its product is 4-pyridoxate.This enzyme belongs to the family of oxidoreductases, specifically those acting on the aldehyde or oxo group of donor with oxygen as acceptor. The systematic name of this enzyme class is pyridoxal:oxygen 4-oxidoreductase. This enzyme participates in vitamin B6 metabolism. It employs one cofactor, molybdenum.

Pyriphlegethon

Pyriproxyfen is a pyridine-based pesticide which is found to be effective against a variety of arthropoda. It was introduced to the US in 1996, to protect cotton crops against whitefly. It has also been found useful for protecting other crops. It is also used as a prevention for flea control on household pets, for killing indoor and outdoor ants and roaches.

pyridinium

MWMQNVGAHVXSPE-UHFFFAOYSA-N

Pyrithione is the common name of an organosulfur compound with molecular formula C5H5NOS, chosen as an abbreviation of pyridinethione, and found in the Persian shallot. It exists as a pair of tautomers, the major form being the thione 1-hydroxy-2(1H)-pyridinethione and the minor form being the thiol 2-mercaptopyridine N-oxide; it crystallises in the thione form. It is usually prepared from either 2-bromopyridine, 2-chloropyridine, or 2-chloropyridine N-oxide, and is commercially available as both the neutral compound and its sodium salt. It is used to prepare zinc pyrithione, which is used primarily to treat dandruff and seborrhoeic dermatitis in medicated shampoos, though is also an anti-fouling agent in paints.

Pyridoxine 5’-phosphate oxidase is an enzyme that catalyzes several reactions in the vitamin B6 metabolism pathway. Pyridoxine-5-P oxidase catalyzes the terminal step (also the rate-limiting step) in vitamin B6 metabolism, the biosynthesis of pyridoxal-5’-phosphate, the biologically active form of vitamin B6 which acts as an essential cofactor. Pyridoxine 5’-phosphate oxidase is a member of the enzyme class oxidases, or more specifically, oxidoreductases. These enzymes catalyze a simultaneous oxidation-reduction reaction. The substrate oxidase enzymes is hydroxlyated by one oxygen atom of molecular oxygen.Concurrently, the other oxygen atom is reduced to water. Even though molecular oxygen is the electron acceptor in these enzymes’ reactions, they are unique because oxygen does not appear in the oxidized product.

Pyrimidone

Pyriatyn Raion

Pyrilia aurantiocephala

Uninhabited

File:Собор Рiздва Богородицi. м.Пирятин.jpg

Skeletal formula of pyridoxal

*Terias thymetus f. formosanus (Jörgensen, 1935)

In enzymology, a pyridoxal kinase (EC 2.7.1.35) is an enzyme that catalyzes the chemical reactionATP + pyridoxal ⇌ {\displaystyle \rightleftharpoons } ADP + pyridoxal 5'-phosphateThus, the two substrates of this enzyme are ATP and pyridoxal, whereas its two products are ADP and pyridoxal 5'-phosphate.This enzyme belongs to the family of transferases, specifically those transferring phosphorus-containing groups (phosphotransferases) with an alcohol group as acceptor.

Pyrilia pyrilia

Walker, 1863

None

Pyrgus syrichthus

Pyrisitia lisa

Pyridoxamine—oxaloacetate transaminase

Pyricularia oryzae

P53

Pyridyne in chemistry is the pyridine analogue of benzyne. This reactive intermediate is of some importance to scientific research. Pyridynes are the class of compounds sharing the pyridyne building motive. Two isomers exist, the 2,3-pyridine (2,3-didehydropyridine) and the 3,4-pyridyne (3,4-didehydropyridine). The reaction of 3-bromo-4-chloropyridine with furan and lithium amalgam gives 1,4-epoxy-dihydroquinoline through the 2,3-pyridyne intermediate.

Pyricidin

Pyrimidine dimer

Pyrimidinedione

Pyritinol also called pyridoxine disulfide or pyrithioxine (European drug names Encephabol, Encefabol, Cerbon 6) is a semi-synthetic water-soluble analog of vitamin B6 (Pyridoxine HCl). It was produced in 1961 by Merck Laboratories by bonding 2 vitamin B6 compounds (pyridoxine) together with a disulfide bridge. Since the 1970s, it has been a prescription and OTC drug in several countries for cognitive disorders and learning disorders in children. Since the early 1990s it has been sold as a nootropic dietary supplement in the United States.

Pyridoxine 4-dehydrogenase

Pyridoxine 5-dehydrogenase

Pyridinium is the cationic conjugate acid of pyridine. This can either be due to protonation of the ring nitrogen or because of addition of a substituent to the ring nitrogen, typically via alkylation. The lone pair of electrons on the nitrogen atom of pyridine is not delocalized, and thus pyridine can be protonated easily. Pyridine is often used as an organic base in chemical reactions, thus the pyridinium ion is produced as the counter ion to the leaving group in the reaction. This complex is often insoluble in the organic solvent, so precipitation of the pyridinium leaving group complex is an indication of the progress of the reaction. The pyridinium ion also plays a role in Friedel-Crafts acylation. When pyridine is included, it forms a complex with the electrophilic acylium ion, rendering it even more reactive. Because the protonation involves only the lone pair electrons of nitrogen in pyridine, pyridinium is an aromatic ion, as determined through Hückel's rule.

Pyriphis pyrenoides

Pyridoxine 5’-phosphate oxidase

Pyrimidone "Medi-Pets"

Pyrilampes (Greek: Πυριλάμπης) was an ancient Athenian politician and stepfather of the philosopher Plato. His dates of birth and death are unknown, but according to estimations of Debra Nails, he must have been born after 480 BC and died before 413 BC.Pyrilampes had served many times as an ambassador to the Persian court and was a friend of Pericles, the leader of the democratic faction in Athens. He was injured at the Battle of Delium in 424 BC, when he was in his mid-fifties. Pyrilampes raised and showed peacocks, gifts he had received on his Asian embassies. Plutarch states accusations against Pyrilampes, according to which he used the peacocks to procure freeborn women for Pericles.Pyrilampes appears to have married his first wife in the late 440s; he had a son from this marriage, Demus, who was famous for his beauty. Around 423 BC, Pyrilampes had been widowed and so was free to marry his niece, Perictione, Plato's mother. Perictione gave birth to Pyrilampes' second son, Antiphon, the half-brother of Plato, who appears in Parmenides in which he is said to have given up philosophy to devote most of his time to horses.

Pyrimidine-5'-nucleotide nucleosidase

Pyridazol

CL0041

Pyridinium salt

Пирятинський район

Pyridine-1-oxide

Pyriatyn Airport was an airfield located approximately 7 miles (11 km) south of Pyriatyn (Piryatin), Ukraine. Satellite imagery appears to show that it has been abandoned.

Pyrgus syrechtus

Pyrimidinetriol

Pyrgus sysichtus

pyridoxal kinase

Pyrikappl

*Terias joannisi ab. minor (Dufrane, 1947)
P. n. nise, Jamaica

yes

4-Phenoxyphenyl (R/S)-2-(2-pyridyloxy)propyl ether

Pyrianoreina piranga is a species of beetle in the family Cerambycidae. It was described by Martins and Galileo in 2008.

Pyritohedral

Country

Pyridones

Pyridine-3-carboxamide

Pyridinium tosylate

Warren's skipper

Pyrimidinones

Pyrgus syrichtus

inline,title

Pyridazines

Pyrimidinone

Pyritis

pyrimidine-nucleoside phosphorylase

Pyridoxine-dependent epilepsy (PDE), also referred to as pyridoxine-dependent seizure (PDS) or vitamin B6 responsive epilepsy, is an extremely rare genetic disorder characterized by intractable seizures in the prenatal and neonatal period. The disorder was first recognized in the 1950s, with the first description provided by Hunt et al. in 1954. More recently, pathogenic variants within the ALDH7A1 gene have been identified to cause PDE.

Pyrimidinecarboxylic acid

Pyrimidine dimer DNA glycosylase

Pyrgus tethys

Pyridoxine deficit

Pyridylnicotinamide may refer to one of two isomers with molecular formula C11H9N3O:3-Pyridylnicotinamide4-Pyridylnicotinamide

Skeletal formula

Pyricularia oryxae

Turner, 1920

In enzymology, a pyridoxal 4-dehydrogenase (EC 1.1.1.107) is an enzyme that catalyzes the chemical reactionpyridoxal + NAD+ ⇌ {\displaystyle \rightleftharpoons } 4-pyridoxolactone + NADH + H+Thus, the two substrates of this enzyme are pyridoxal and NAD+, whereas its 3 products are 4-pyridoxolactone, NADH, and H+.This enzyme belongs to the family of oxidoreductases, specifically those acting on the CH-OH group of donor with NAD+ or NADP+ as acceptor.

A pyrin domain is a protein domain and a subclass of protein motif known as the death fold; it allows a pyrin domain containing protein to interact with other proteins that contain a pyrin domain. It is also known as a PYD or PAAD/DAPIN domain, and is distantly evolutionarily related to the Death domain family of protein domains. Proteins containing a pyrin domain are frequently involved in biological processes called inflammation and apoptosis.

Pyridium

Pyrithiamine deaminase

Pyrinia incensata is a species of moth of the family Geometridae. It was described by Walker in 1863. It is found in Brazil (Para).Adults are bright ochraceous, the wings minutely red-speckled. The exterior line is red, straight, oblique and well defined and the submarginal line is red, indistinct and nearly obsolete in the forewings. The forewings are slightly acute, with a hyaline basal dot. The interior line is red, slight and bent and the exterior line is forked near the costa, where it includes a purplish mark.

1-(pyridin-2-yl)piperazine

SIXLXDIJGIWWFU-UHFFFAOYSA-N

article

Pyrimidin

pyrithiamine deaminase

Pyridostigmine bromide

Ball-and-stick model

Pyriproxifen

pyridoxal oxidase

Pyridazine 2D numbers.svg

: 2-Mercaptopyridine monoxide

Pyrites

PAAD/DAPIN/Pyrin domain

Pyridine (data page)

Hydroxypyrimidine; Pyrimidinone

Pyridoxal 5-phosphate, PAL-P, PLP, Vitamin B6 phosphate

Pyridotriazolobenzodiazepine

Pyrimidone is the name given to either of two heterocyclic compounds with the formula C4H4N2O: 2-pyrimidone and 4-pyrimidone. The compounds can also be called 2-hydroxypyrimidine or 4-hydroxypyrimidine respectively, based on a substituted pyrimidine, or 1,3-diazine, ring.

Pyrimidine nucleosides

Pyridoxamine is one form of vitamin B6. Chemically it is based on a pyridine ring structure, with hydroxyl, methyl, aminomethyl, and hydroxymethyl substituents. It differs from pyridoxine by the substituent at the 4-position.

Pyrilampes (Greek: Πυριλάμπης) was an ancient Athenian politician and stepfather of the philosopher Plato. His dates of birth and death are unknown, but according to estimations of Debra Nails, he must have been born after 480 BC and died before 413 BC.Pyrilampes had served many times as an ambassador to the Persian court and was a friend of Pericles, the leader of the democratic faction in Athens. He was injured at the Battle of Delium in 424 BC, when he was in his mid-fifties.

Pyrinamine Base

Pyrgus syricthus

In enzymology, a pyrimidine-nucleoside phosphorylase (EC 2.4.2.2) is an enzyme that catalyzes the chemical reactiona pyrimidine nucleoside + phosphate ⇌ {\displaystyle \rightleftharpoons } a pyrimidine base + alpha-D-ribose 1-phosphateThus, the two substrates of this enzyme are pyrimidine nucleoside and phosphate, whereas its two products are pyrimidine base and alpha-D-ribose 1-phosphate.This enzyme belongs to the family of glycosyltransferases, specifically the pentosyltransferases.

pyrimidine-deoxynucleoside 2'-dioxygenase

Pyrgus sidae, the yellow-banded skipper, is a species of skipper (family Hesperiidae). It is found in from the Iberian Peninsula (only an isolated occurrence in the Sierra de Gredos) through southern and eastern Europe , southeast France, the northwestern coastal areas of central Italy, then Istria (Slovenia and Croatia) and the Balkan peninsula, across Turkey, Transcaucasia, to Iran and Afghanistan. East of the Southern Ural mountains the range extends to northwest Kazakhstan and the west of the Tien Shan in the north.Pyrgus species are usually difficult to separate in the field but P. sidae is a notable exception. It is the largest member of the genus found in Europe with a wingspan of 32–38 mm and can be instantly recognized by two bold black-edged yellow bands on the underside of the hindwings. The dark brown upper forewings are also boldly marked with numerous large white spots. The adults fly in June and July.The larval food plant is Abutilon avicennae.

Pyridoxal is one form of vitamin B6.Some medically relevant bacteria, such as those in the genera Granulicatella and Abiotrophia, require pyridoxal for growth. This nutritional requirement can lead to the culture phenomenon of satellite growth. In in vitro culture, these pyridoxal-dependent bacteria may only grow in areas surrounding colonies of bacteria from other genera ("satellitism") that are capable of producing pyridoxal.Pyridoxal is involved in what is believed to be the most ancient reaction of aerobic metabolism on Earth, about 2.9 billion years ago, a forerunner of the Great Oxidation Event

In enzymology, a pyridoxine 5-dehydrogenase (EC 1.1.99.9) is an enzyme that catalyzes the chemical reactionpyridoxine + acceptor ⇌ {\displaystyle \rightleftharpoons } isopyridoxal + reduced acceptorThus, the two substrates of this enzyme are pyridoxine and acceptor, whereas its two products are isopyridoxal and reduced acceptor.This enzyme belongs to the family of oxidoreductases, specifically those acting on the CH-OH group of donor with other acceptors. The systematic name of this enzyme class is pyridoxine:acceptor 5-oxidoreductase. Other names in common use include pyridoxal-5-dehydrogenase, pyridoxol 5-dehydrogenase, pyridoxin 5-dehydrogenase, pyridoxine dehydrogenase, pyridoxine 5'-dehydrogenase, and pyridoxine:(acceptor) 5-oxidoreductase. This enzyme participates in vitamin B6 metabolism. It has 2 cofactors: FAD, and PQQ.

BX02

Pyriprole (trade name Prac-tic) is for veterinary use on dogs against external parasites such as fleas and ticks.Pyriprole is a phenylpyrazole derivative similar to fipronil. Although recently introduced (in the 2000s) and still under patent protection it is a "classic" insecticide. So far it is only approved in the EU and a few other countries for use on dogs. It is not approved for use on cats or livestock.

1-(2-Pyrimidinyl)piperazine (1-PP, 1-PmP) is a chemical compound and piperazine derivative. It is known to act as an α2-adrenergic receptor antagonist, and as a 5-HT1A receptor partial agonist to a much lesser extent.

Pyritization

In enzymology, a pyridoxal oxidase (EC 1.2.3.8) is an enzyme that catalyzes the chemical reactionpyridoxal + H2O + O2 ⇌ {\displaystyle \rightleftharpoons } 4-pyridoxate + (?)The 3 substrates of this enzyme are pyridoxal, H2O, and O2, whereas its product is 4-pyridoxate.This enzyme belongs to the family of oxidoreductases, specifically those acting on the aldehyde or oxo group of donor with oxygen as acceptor.

Pyrimidine 2D numbers.svg

Pyrithioxin

Pyridoxal phosphatase

Pyridoxal 5'-phosphate synthase (glutamine hydrolyzing)

A pyrin domain is a protein domain and a subclass of protein motif known as the death fold; it allows a pyrin domain containing protein to interact with other proteins that contain a pyrin domain. It is also known as a PYD or PAAD/DAPIN domain, and is distantly evolutionarily related to the Death domain family of protein domains. Proteins containing a pyrin domain are frequently involved in biological processes called inflammation and apoptosis. Proteins that possess a pyrin domain include intracellular microbial sensors called NOD-like receptors, and proteins associated with their function, such as PYCARD and certain fish caspases.

Pyrisitia nise, the mimosa yellow, is a butterfly in the family Pieridae. It is found from Argentina north to the Texas Gulf Coast and throughout central and southern Florida, northward to the Tennessee Valley. It is an occasional stray to central Texas and south-eastern Arizona and rarely to southern California, southern Colorado and Kansas. The habitat consists of brushy woodland edges.The wingspan is 29–51 mm (1.1–2.0 in). Both sexes are yellow.

Pyridinium chromic chloride

4-(aminomethyl)-5-(hydroxymethyl)-2-methylpyridin-3-ol

Oizine

Omadine

Pyrgus zebra

Doxylamine

P. nise

Top: Structural formula of the monomer

In enzymology, a pyridoxal 4-dehydrogenase (EC 1.1.1.107) is an enzyme that catalyzes the chemical reactionpyridoxal + NAD+ ⇌ {\displaystyle \rightleftharpoons } 4-pyridoxolactone + NADH + H+Thus, the two substrates of this enzyme are pyridoxal and NAD+, whereas its 3 products are 4-pyridoxolactone, NADH, and H+.This enzyme belongs to the family of oxidoreductases, specifically those acting on the CH-OH group of donor with NAD+ or NADP+ as acceptor. The systematic name of this enzyme class is pyridoxal:NAD+ 4-oxidoreductase. This enzyme is also called pyridoxal dehydrogenase. This enzyme participates in vitamin B6 metabolism.

Pyridoxal 5'-phosphate synthase (glutamine hydrolyzing) (EC 4.3.3.6, PdxST) is an enzyme with systematic name D-ribose 5-phosphate,D-glyceraldehyde 3-phosphate pyridoxal 5'-phosphate-lyase. This enzyme catalyses the following chemical reactionD-ribose 5-phosphate + D-glyceraldehyde 3-phosphate + L-glutamine ⇌ {\displaystyle \rightleftharpoons } pyridoxal 5'-phosphate + L-glutamate + 3 H2O + phosphate (overall reaction)(1a) L-glutamine + H2O ⇌ {\displaystyle \rightleftharpoons } L-glutamate + NH3(1b) D-ribose 5-phosphate + D-glyceraldehyde 3-phosphate + NH3 ⇌ {\displaystyle \rightleftharpoons } pyridoxal 5'-phosphate + 4 H2O + phosphateThe enzyme can also use ribulose 5-phosphate and dihydroxyacetone phosphate.

*Eurema frieda f. discopunctata (Baumann & Reissinger, 1969)

pyridoxamine-oxaloacetate transaminase

Pyrgus warrenensis, the Warren's skipper, is a species of skipper (family Hesperiidae). It is a strictly Alpine species.This is a small skipper (wingspan 18–24 mm) with tiny white markings on dark brown wings. Very little is known about the ecology of this species and the larval food plant is unknown.

vertical

Pyritinol also called pyridoxine disulfide or pyrithioxine (European drug names Encephabol, Encefabol, Cerbon 6) is a semi-synthetic water-soluble analog of vitamin B6 (Pyridoxine HCl). It was produced in 1961 by Merck Laboratories by bonding 2 vitamin B6 compounds (pyridoxine) together with a disulfide bridge. Since the 1970s, it has been a prescription and OTC drug in several countries for cognitive disorders and learning disorders in children.

Pyriatyn, Ukraine

Pyrisitia

P. sidae

Bottom: Ball-and-stick model of the dimer
N-Hydroxypyridine-2-thione

Pyridine, 4-amino-

*Eurema larae f. ricardi (Torre & Alayo, 1953)

Raion

Pyrimidinylpiperazine

Pyridone may refer to several organic compounds with the formula C5H4NH(O):2-Pyridone3-Pyridone4-Pyridone

Pyridinylpiperazine

P. piranga

Pyridoxal oxidase

Pyrites Island is the largest of three small islands lying northeast of Gam Point and forming the east side of Esther Harbor, off the north coast of King George Island in the South Shetland Islands. In 1913–14, the rocky extremity of Gam Point and the adjoining islands to the northwest and southeast were named Esther, Pyritis (sic) or Pyritic Islands by Scottish geologist David Ferguson, who reported they were composed of pyrites and vein quartz. From Ferguson's description it appears that the ice cliff behind the Gam Point has advanced since 1914 so that this "island" is now joined to the mainland. The highest and most conspicuous of the remaining islands is the one here described. The name Pyrites Island was recommended by the United Kingdom Antarctic Place-Names Committee (UK-APC) in 1960 to avoid confusion with the other existing "Esther" names in the vicinity.

PyriminilVacor

Pyrilia caica

*Terias tenella ab. alcides (d'Almeida, 1913)

Pyrhhic victory

: 1-Hydroxypyridine-2-thione

Pyrisita boisduvaliana

Pyrgus syrictus

In enzymology, a pyridoxine 4-dehydrogenase (EC 1.1.1.65) is an enzyme that catalyzes the chemical reactionpyridoxine + NADP+ ⇌ {\displaystyle \rightleftharpoons } pyridoxal + NADPH + H+Thus, the two substrates of this enzyme are pyridoxine and NADP+, whereas its 3 products are pyridoxal, NADPH, and H+.This enzyme belongs to the family of oxidoreductases, specifically those acting on the CH-OH group of donor with NAD+ or NADP+ as acceptor.

Pyridoxalphosphate-6-azophenyl-2',4'-disulfonic acid

In enzymology, a pyridoxine 5-dehydrogenase (EC 1.1.99.9) is an enzyme that catalyzes the chemical reactionpyridoxine + acceptor ⇌ {\displaystyle \rightleftharpoons } isopyridoxal + reduced acceptorThus, the two substrates of this enzyme are pyridoxine and acceptor, whereas its two products are isopyridoxal and reduced acceptor.This enzyme belongs to the family of oxidoreductases, specifically those acting on the CH-OH group of donor with other acceptors.

Pyridoxamine:pyruvate aminotransferase

Pyridylnicotinamide

Interconversion of pyrithione tautomers

Pyribenzamin

Yellow-banded skipper

2-(piperazin-1-yl)pyrimidine

City

Pyridotriazolodiazepine

*Terias tenella f. germana (d'Almeida, 1921)

Skeletal formula with numbering convention

Bonaparte, 1856

Pyrgus

Pyridoxine and doxylamine

Pyridone (disambiguation)

Pyrianoreina hovorei is a species of beetle in the family Cerambycidae. It was described by Martins and Galileo in 2008.

In enzymology, a pyrimidine-5'-nucleotide nucleosidase (EC 3.2.2.10) is an enzyme that catalyzes the chemical reactiona pyrimidine 5'-nucleotide + H2O ⇌ {\displaystyle \rightleftharpoons } D-ribose 5-phosphate + a pyrimidine baseThus, the two substrates of this enzyme are pyrimidine 5'-nucleotide and H2O, whereas its two products are D-ribose 5-phosphate and pyrimidine base.This enzyme belongs to the family of hydrolases, specifically those glycosylases that hydrolyse N-glycosyl compounds.

(Hunter, 1897)

File:Pyryatyn prapor.png

Pyrimidine is an aromatic heterocyclic organic compound similar to pyridine. One of the three diazines (six-membered heterocyclics with two nitrogen atoms in the ring), it has the nitrogen atoms at positions 1 and 3 in the ring. The other diazines are pyrazine (nitrogen atoms at the 1 and 4 positions) and pyridazine (nitrogen atoms at the 1 and 2 positions). In nucleic acids, three types of nucleobases are pyrimidine derivatives: cytosine (C), thymine (T), and uracil (U).

Pyridoxamine-5'-phosphate:oxygen oxidoreductase (deaminating)

Pyrilinks-D

Pyrintö Tampere

Pyriscence

Pyridoxal phosphate

Pyritohedral symmetry

*Camptochilus sinuosa (Warren, 1896)
*Pyralioides sinuosa (Warren, 1896)
*Camptochilus sinuosa
*Rhodoneura excavata (Gaede, 1917)

#Species

Pyridinoline, also known as Hydroxylysylpyridinoline, is a fluorescent cross-linking compound of collagen fibers. Crosslinks in collagen and elastin are derived from lysyl and hydroxylysyl residues, a process catalyzed by lysyl oxidase. Fujimoto and colleagues first described the isolation and characterization of a fluorescent material in bovine Achilles tendon collagen and termed it pyridinoline. It is reported to be present in collagen of bone and cartilage, but is absent in collagen of skin.

Pyrimidines

Pyrilampes

Pyritohedron

Pyrgus superna

Location in Antarctica

methyl phosphate

Ukraine

Pyrimidyl

Pyrinto Tampere

Pyriluma

Pyriform cortex

In enzymology, a pyridine N-methyltransferase (EC 2.1.1.87) is an enzyme that catalyzes the chemical reactionS-adenosyl-L-methionine + pyridine ⇌ {\displaystyle \rightleftharpoons } S-adenosyl-L-homocysteine + N-methylpyridiniumThus, the two substrates of this enzyme are S-adenosyl methionine and pyridine, whereas its two products are S-adenosylhomocysteine and N-methylpyridinium.This enzyme belongs to the family of transferases, specifically those transferring one-carbon group methyltransferases. The systematic name of this enzyme class is S-adenosyl-L-methionine:pyridine N-methyltransferase. This enzyme is also called pyridine methyltransferase.

Pyrimidine synthesis inhibitor

In enzymology, a pyrimidine-5'-nucleotide nucleosidase (EC 3.2.2.10) is an enzyme that catalyzes the chemical reactiona pyrimidine 5'-nucleotide + H2O ⇌ {\displaystyle \rightleftharpoons } D-ribose 5-phosphate + a pyrimidine baseThus, the two substrates of this enzyme are pyrimidine 5'-nucleotide and H2O, whereas its two products are D-ribose 5-phosphate and pyrimidine base.This enzyme belongs to the family of hydrolases, specifically those glycosylases that hydrolyse N-glycosyl compounds. The systematic name of this enzyme class is pyrimidine-5'-nucleotide phosphoribo(deoxyribo)hydrolase. Other names in common use include pyrimidine nucleotide N-ribosidase, and Pyr5N. This enzyme participates in pyrimidine metabolism.

Pyrilia is a genus of parrots in the family Psittacidae. It was recently split from the now-monotypic Pionopsitta, and then briefly moved to Gypopsitta. But as Pyrilia was published a few months before Gypopsitta, the latter is a junior synonym.All are relatively short-tailed parrots that are restricted to forests in the Neotropics. Their head or face contrasts clearly with the mainly green body, and they have a brownish or olive patch on the chest.

The pyrite group of minerals is a set of cubic crystal system minerals with diploidal structure.

Pyrin domain

AK5Q5FZH2R

Pyrimidine phosphorylase

Pyridoxamine is one form of vitamin B6. Chemically it is based on a pyridine ring structure, with hydroxyl, methyl, aminomethyl, and hydroxymethyl substituents. It differs from pyridoxine by the substituent at the 4-position. The phenol at position 3 and aminomethyl group at position 4 of its ring endow pyridoxamine with a variety of chemical properties, including the scavenging of free radical species and carbonyl species formed in sugar and lipid degradation and chelation of metal ions that catalyze Amadori reactions.

Pyridoxamine:oxaloacetate aminotransferase

Pyridoxine 5'-O-b-D-glucosyltransferase

Pyridine N-oxide

Pyridinoline

*Terias thymetus f. cordobensis (Köhler, 1923)

Pyridoxal-5'-phosphate phosphohydrolase

Church of the Nativity of Virgin Mary

Ball-and-stick model of the pyridinium cation

Pyridbenzamine

Pyridoxamine-pyruvate transaminase

Pyrimidine-nucleoside:phosphate alpha-D-ribosyltransferase

Pyridine N-methyltransferase

Oc1cCO

Undetermined

pyridoxine 4-dehydrogenase

Structures of 1:2 complexes of zinc and the conjugate base of pyrithione

Pyrheliometer

Pyridipca

pyridoxine 5-dehydrogenase

1-(2-Pyrimidinyl)piperazine (1-PP, 1-PmP) is a chemical compound and piperazine derivative. It is known to act as an α2-adrenergic receptor antagonist, and as a 5-HT1A receptor partial agonist to a much lesser extent. It does not appear to have any significant affinity for the D2 or α1-adrenergic receptors.A number of pyrimidinylpiperazine derivatives are drugs, including:Buspirone - anxiolyticDasatinib - anticancer agentEptapirone - anxiolyticGepirone - anxiolyticIpsapirone - anxiolyticPiribedil - antiparkinsonian agentRevospirone - anxiolyticTandospirone - anxiolyticTirilazad - neuroprotective agentUmespirone - anxiolyticZalospirone - anxiolyticThe anxiolytics are also classified as azapirones due to the azaspirodecanedione moiety in their structures. 1-PP is a common metabolite of most or all of the listed agents. Alnespirone, binospirone, and enilospirone, despite being azapirones, are not piperazines and therefore do not metabolize to 1-PP, and while perospirone and tiospirone are piperazines, they are instead benzothiazole-substituted piperazines and do not metabolize to 1-PP either.

In enzymology, a pyridoxal phosphatase (EC 3.1.3.74) is an enzyme that catalyzes the chemical reactionpyridoxal 5'-phosphate + H2O ⇌ {\displaystyle \rightleftharpoons } pyridoxal + phosphateThus, the two substrates of this enzyme are pyridoxal 5'-phosphate and H2O, whereas its two products are pyridoxal and phosphate.This enzyme belongs to the family of hydrolases, specifically those acting on phosphoric monoester bonds. The systematic name of this enzyme class is pyridoxal-5'-phosphate phosphohydrolase. Other names in common use include vitamine B6 (pyridoxine) phosphatase, PLP phosphatase, vitamin B6-phosphate phosphatase, and PNP phosphatase. This enzyme participates in vitamin B6 metabolism.

Pyridoxal 4-dehydrogenase

Pyridoxal:oxygen 4-oxidoreductase

Administered under the Antarctic Treaty System

Pyridine-2-carboxaldehyde