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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 ?
    Polycyclic aromatic hydrocarbons (PAHs) that form mainly as a result of pyrolysis process, especially the incomplete combustion of organic compounds are a diversified classes of carcinogenic chemicals [1].
    Pulmonary and cardiac manifestations are common in SLE patients, which are common cause of mortality and morbidity.8 Pulmonary arterial Hypertension is the least studied parameter among patients o SLE, but it is not uncommon.8 Diagnosis of early PAH can safeguard patients from grave consequences.8
    Therefore, PAHs can serve as geochemical markers for assessing anthropogenic influences within a specific environmental medium because they are closely related to human activities such as anthropogenic combustion processes [4].
    The research on the Asian SLE-PAH population has regional characteristics; nevertheless, we could not find correlation of selected SNPs with PAH onset either.
    Patients with PAH exhibit multiple nonspecific symptoms, with fatigue, weakness, dizziness, and progressive shortness of breath on exertion being often reported by patients (12).
    The reaction mechanism of P[A.sub.6]-g-LCX-PAH fiber with formaldehyde was investigated by both FTIR spectra and [H.sup.1]-NMR spectrum of PAH and PAHF (the resultant of reaction from formaldehyde and PAH), as presented in Figs.
    PAHs are carcinogens in nature, so many health risks may be associated to PAHs to much more extent (WHO, 2014).
    These cancer risk values were then compared to cancer risk values calculated for exposure to sediment in the original AWI Superfund site risk assessment performed by the US EPA, for the same seven PAH COCs.
    For smoked salmon fillets, the results illustrated direct smoking producing higher PAH levels than the indirect smoking (Figure 3(b)).
    The deactivation of the inlet split (0 mL x [min.sup.-1]) generated a significant improvement in PAH desorption because the complete sample, without purge, arrived at the cold trap.
    Heritable PAH is confirmed if two or more family members have PAH or if a BMPR2 gene mutation is identified in the affected person.
    In lab experiments, most of them conducted in test tubes and in animals, researchers use doses of HCAs and PAHs that are extremely high, the equivalent of thousands of times the exposure of a person eating a typical diet.