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symbol for the element protactiniumprotactinium
, radioactive chemical element; symbol Pa; at. no. 91; mass number of most stable isotope 231; m.p. greater than 1,600°C;; b.p. 4,026°C;; sp. gr. 15.37 (calculated); valence +4, +5. Protactinium is a malleable, shiny silver-gray radioactive metal.
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Abbrev. for position angle.

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    Symbol for pascal; a unit of pressure.


    On drawings, abbr. for public address system.

    pascal (Pa)

    The Standard International unit of pressure; 1 pascal is equal to 1 newton per square meter.


    , pah NZ
    1. a Maori village or settlement
    2. History a Maori defensive position and settlement on a hilltop


    The country code for Panama.
    References in periodicals archive ?
    oSildenafil, a phosphodiesterase type 5(PDE5) inhibitor is also used to treat PAH.
    The PAH concentrations detected in wastewater-irrigated areas were significantly higher than PAH concentrations found in the control area: [SIGMA]PAHs were 1,046.
    The pathogenesis of PAH is closely related to heart and pulmonary circulation.
    Since there is hardly any data available on PAH in Lahore, Pakistan, the purpose of this research based study was to acquire the useful foundational information regarding the concentration of polycyclic aromatic hydrocarbon present in the total suspended particulate matter.
    About 20% of patients with idiopathic PAH and 80% of those with heritable PAH have a mutation of the bone morphogenetic protein receptor (BMPR2) gene, a member of the super-family of TGF proteins.
    In India, the sources of indoor PAHs are cooking, smoking, burning of natural gas, liquid petroleum gas, kerosene, wood, dung, coal, candles and incense sticks while the sources of outdoor PAHs include transport.
    Photooxidation and rapid photolysis may be also a reason of depletion of high molecular (>3 rings) PAH like pyrene.
    Pihkva sediment core PAH Code Molecular weight Naphthalene (LMW) NAP 128 Acenaphthylene (LMW) ACPy 152 Acenaphthene (LMW) ACP 154 Fluorene (LMW) FLU 166 Anthracene (LMW) ANT 178 Phenanthrene (LMW) PHE 178 Fluoranthene (LMW) FLT 202 Pyrene (HMW) PYR 202 Chrysene (HMW) CHR 228 Benzo[a]anthracene (HMW) BAA 228 Benzo[b+k]fluoranthene (HMW) BBF 252 Benzo[a]pyrene (HMW) BAP 252 Indeno[1,2,3-cd]pyrene (HMW) INP 276 Benzo[g,/h,i]perylene (HMW) BGP 276 Dibenzo[a,h]anthracene (HMW) DBA 278 PAH Group by Benzene vertical (and total) distribution ring (Fig.
    In humans, these PAHs are considered most probable carcinogens based on the evidence of carcinogenicity in animals, and the probability that similarity in metabolic processes involved in dealing with PAHs exists in humans and animals.
    We estimated ambient air PAH concentrations at a census tract resolution using results from the U.
    Nadeau also reported that consistent PAH exposure coincided with changes in a gene called Foxp3.
    Comment: Airborne PAH are generated in the processing of coal, crude oil, and natural gas, and by the incomplete burning of oil and gas used for heating and transportation.