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palaeoconservativeAlternative spelling of paleoconservative.paleomagnetosphereThe magnetosphere, as it was in prehistoric timespalmitotransferase(biochemistry) palmitoyltransferasepalmitoylcarnitine(biochemistry) An ester derivative of carnitine involved in the metabolism of fatty acids.papilioerythrinone(organic chemistry) A carotenoid (6S)-6-hydroxy-2,4,4-trimethyl-3-[(1E,3E,5E,7E,9E,11E,13E,15E,17E)-3,7,12,16-tetramethyl-18-[(1R)-2,6,6-trimethyl-4-oxocyclohex-2-en-1-yl]octadeca-1,3,5,7,9,11,13,15,17-nonaenyl]cyclohex-2-en-1-one in the kin and feathers of birdsparabariomicrolite(mineralogy, outdated) A trigonal-hexagonal scalenohedral mineral containing barium, hydrogen, oxygen, and tantalum.parahydroxybenzenehydroquinonepararammelsbergite(mineralogy) An orthorhombic-dipyramidal mineral containing arsenic and nickel.pentaazamacrocycle(organic chemistry) Any macrocycle that has five nitrogen atoms in the ringpentachloroanisole(organic chemistry) A pentachloro derivative of anisole (in which the five hydrogens of the benzene ring are replaced by chlorine)pentachlorobenzene(organic chemistry) A chlorinated derivative of benzene C₆HCl₅pentafluorostyrene(organic chemistry) A derivative of styrene in which each hydrogen of the benzene ring has been replaced by fluorine; it is used to make specialized polymers.pentagalacturonateA salt or ester of pentagalacturonic acid.pentamethylbenzene(organic chemistry) An aromatic hydrocarbon, C₆H(CH₃)₅, obtained by methylation of xylene.pentylenetetrazoleAlternative spelling of pentylenetetrazol.peptidoleukotrieneA lipopeptide derived from leukotrienepeptidylcitrullineA citrulline residue within a peptidepeptidylnucleosideAny peptidyl derivative of a nucleosideperfluoroalkanoate(organic chemistry) Any perfluoro alkanoateperfluorobutanoate(organic chemistry) Any perfluoro derivative of a butanoate group or anionperfluorodecanoate(organic chemistry) Any perfluoro derivative of a decanoate group or anionperfluoroglutarate(organic chemistry) a perfluoro derivative of the glutarate groupperfluorohexanoate(organic chemistry) Any perfluoro derivative of a hexanoate group or anionperfluorononanoate(organic chemistry) Any perfluoro derivative of a nonanoate group or anionperfluorooctanoateA salt or ester of perfluorooctanoic acid.perfluoropentacene(organic chemistry) The completely fluorinated derivative of pentacene; it is an organic semiconductorperfluorosulfonate(organic chemistry) Any sulfonate whose hydrogen atoms have all been replaced with those of fluorine; many of then are used as ionomers.phanerocrystalline(geology, of rocks) Visibly crystalline.pharmacodependencedependence on a pharmaceutical drugpharmacoprotectiveDescribing a drug that confers protection against a disease or conditionpharmacoresistanceThe condition of being pharmacoresistantphenophosphazinine(organic chemistry) A tricyclic heterocycle consisting of two benzene rings fused to phosphazinephenoxaphosphinine(organic chemistry) A tricyclic heterocycle consisting of two benzene rings fused to oxaphosphinephenylacetaldehyde(organic chemistry) An aromatic compound found in buckwheat, chocolate, etc. responsible for the antibiotic activity of maggot therapy.phenylcarbodiimide(organic chemistry) Any phenyl derivative of a carbodiimidephenylchlorosilane(organic chemistry) The halogenated organosilane C₆H₅SiH₂Clphenyldiazomethane(organic chemistry) The diazo compound C₆H₅CH=N⁺=N⁻; any derivative of this compoundphenylenedicarbene(organic chemistry) Any dicarbene based on a phenylene moiety.phenylethanolamineA biogenic amine related structurally to the major neurotransmitter norepinephrine and the biogenic amine octopamine.phosphatidylserine(organic chemistry) A phospholipid containing serine.phosphogartrellite(mineralogy) A triclinic-pinacoidal bright green mineral containing copper, hydrogen, iron, lead, oxygen, and phosphorus.phosphoglucokinase(biochemistry) A transferase enzyme that participates in starch and sucrose metabolism.phosphoglucomutase(biochemistry) Any enzyme that catalyzes the interconversion of isomers of glucose phosphatesphosphoglucosamine(biochemistry) Either of two isomeric glucosamine phosphatesphosphomannomutase(biochemistry) A phosphotransferase enzyme that catalyzes the chemical reaction alpha-D-mannose 1-phosphate ⇌ D-mannose 6-phosphate.phosphonodiamidite(organic chemistry) Any diamidite derived from a phosphatephosphonodithioate(organic chemistry) Any sulfur derivative of a phosphonate that has the form R-O-PH(=S)S⁻phosphonoselenoate(organic chemistry) Any anion of the form R-O-PH(=O)-Se⁻phosphopantetheine(biochemistry) A derivative of coenzyme A essential to the function of carrier proteinsphosphopentomutase(biochemistry) An isomerase enzyme, alpha-D-ribose 1,5-phosphomutase, involved in pentose phosphate pathway and purine metabolism.phosphorocyanidate(inorganic chemistry) Synonym of cyanophosphonate.phosphorodiamidateA phosphate group in which two oxygens have been replaced by nitrogens.phosphorodithioate(organic chemistry) Synonym of dithiophosphate.phosphorylceramide(biochemistry) Synonym of sphingomyelin.phosphorylcreatine(biochemistry) Phosphocreatine.phosphotransferase(biochemistry) Any enzyme that catalyzes the transfer of a phosphate group (phosphorylation)phosphotriesterasearyldialkylphosphatasephotocrosslinkablephotochemically crosslinkablephotoelectroactiveExhibiting, or relating to, photoelectroactivity.photoelectromotiveOf or relating to the electromotive force caused by photovoltaic action.photofunctionalizeTo photochemically functionalizephotophosphorylase(biochemistry) An enzyme that is involved in the photosynthetic phosphorylation of ATP.photopolymerizableAble to undergo photopolymerizationphototransformablephotochemically transformablephylotranscriptomeThe transcriptome of a specific phylum or speciesphytohemaglutinineMisspelling of phytohemagglutinin.picroindigocarmineA stain made from picric acid and indigo carmine.plastohydroquinone(biochemistry) The reduced, phenolic form of plastoquinonepolyethercarbonate(organic chemistry) Any polymer, or the form [-R-O-CO-O-CH₂-O-]ₙ that has both ether and carbonate groupspolyhomonucleotideA polynucleotide composed of repeats of a single nucleotidepolymethoxyflavone(organic chemistry) Any derivative of a flavone that is substituted with many methoxy groupspolymethylacrylate(chemistry) polymethyl acrylatepolymorphonucleate(chemistry) polymorphonuclearpolyphthalocyanine(organic chemistry) Any of a family of polymers of phthalocyanine, the metal derivatives of which are used as catalysts in organic synthesispolypseudorotaxane(chemistry) Any polymer having a pseudorotaxane as a repeat unitpolyribonucleotide(biochemistry) A biological macromolecule consisting of multiple ribonucleotidespolysporangiophyteAny plant in which the sporophyte has a structure of branching stems (axes) terminating in sporangia.polyubiquitinylate(chemistry) To polyubiquitinate.postdeconstructivePertaining to or characteristic of a style of analysis moving beyond deconstructionism.preantepenultimate(phonetics, obsolete, rare) Synonym of preantepenult (“the last syllable but three of a word or other utterance; the fourth-to-last syllable”).preoligodendrocyteThe structure that develops into an oligodendrocytepreproneuropeptideA precursor of a proneuropeptideprinzregententorteA Bavarian torte having thin layers of sponge cake separated by chocolate buttercream, topped with apricot jam and covered in a dark chocolate glaze.proazaphosphatrane(organic chemistry) The nonionic base of an azaphosphatraneprodifferentiativeThat leads to differentiationpropionylpromasine(organic chemistry) The propionyl derivative of promasine that is a dopamine receptor antagonistpropylketobemidone(pharmacology) A particular narcotic painkiller.protoanthophyllite(mineralogy) An orthorhombic-dipyramidal mineral containing aluminum, hydrogen, iron, magnesium, manganese, nickel, oxygen, silicon, and sodium.protochlorophilideMisspelling of protochlorophyllide.pseudoaffectionateApparently, but not actually, affectionate.pseudoconservative(politics) Apparently, but not actually, conservative.pseudodisaccharide(organic chemistry) The pseudosaccharide form of a disaccharidepseudofluorescenceApparent fluorescence due to internal reflection of lightpseudograndreefite(mineralogy) An orthorhombic-disphenoidal colorless mineral containing fluorine, lead, oxygen, and sulfur.pseudometallophyte(biology) Any plant that can tolerate a high metal content in its environment, but also thrives under normal conditionspseudopelletierine(chemistry) An alkaloid, a homolog of tropinone, derived from pomegranate bark.pseudoquantitativeHaving most, but not all, characteristics of a quantitative procedurepseudoreminiscence(psychology) A false memory.pseudoverticillate(botany) Appearing to be verticillate, but not actually so.psychomanipulativeEmploying or relating to psychomanipulation.pterocarpanquinone(organic chemistry) The naphthoquinone (2S,10S)-3,12-dioxapentacyclo[11.8.0.02,10.04,9.015,20]henicosa-1(13),4,6,8,15,17,19-heptaene-14,21-dione that has antileishmanial activitypyrazolopyrimidine(chemistry) Any of a class of sedative and anxiolytic drugs with similar effects to benzodiazepines, their molecules typified by the linked six-sided pyrimidine ring and five-sided pyrazole ring.pyridinylimidazole(organic chemistry) Any pyridinyl derivative of an imidazolepyridylsulfoximine(organic chemistry) Any pyridyl sulfoximinepyrimidopyrimidine(organic chemistry) A bicyclic heterocycle composed of two pyrimidine rings fused togetherpyrrolidinophenoneAny of a class of recreational designer drugs with psychostimulant effects.