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  • Photoluminescent

    The property of emitting light as the result of absorption of visible or invisible light, which continues for a length of time after excitation.
  • Photosynthesis

    Conversion by plants of light energy into chemical energy, which is then used to support the plants’ biological processes.
  • Photosynthetic

    Able to use sunlight energy to convert atmospheric carbon dioxide into organic compounds. Nearly all plants, most algae and some bacteria are photosynthetic.
  • Photovoltaic

    A field of semiconductor technology involving the direct conversion of electromagnetic radiation as sunlight, into electricity.
  • Photovoltaics

    Devices designed to perform the direct conversion of electromagnetic radiation as sunlight, into electricity.
  • PHPPO

    Public Health Practice Program Office (CDC)
  • PHPPO (Public Health Practice Program Office)

  • PhRMA

    Pharmaceutical Research and Manufacturers of America (formerly PMA)
  • PHS

    Public Health Service (United States)
  • PHS (Public Health Service)

    Part of the U.S. Department of Health and Human Services, it includes FDA, NIH, CDC, SAMHSA, and HRSA.
  • Phycomycetes

    Alga like fungi that do not posses chlorophyll and cannot photosynthesize. Aquatic and terrestrial molds belong to this category.
  • Physical Barrier

    Any equipment, facilities, or devices (e.g., fermentors, factories, filters, thermal oxidizers) that are designed to achieve containment.
  • Physical Completion

    A project milestone where the installation of a system is complete as per engineering design and the documentation required to support commissioning is available.
  • Physical Configuration Audit

    (IEEE) An audit conducted to verify that a configuration item, as built, conforms to the technical documentation that defines it. See: functional configuration audit.
  • Physical Hazard

    A classification of a chemical for which there is scientifically valid evidence that it is a combustible liquid, compressed gas, cryogenic, explosive, flammable gas, flammable liquid, flammable solid, organic peroxide, oxidizer, pyrophoric, unstable, (reactive), or water-reactive material.
  • Physical Manipulation

    A process other than a chemical reaction that may change the purity of the physical properties of the material, including but not limited to, crystallization, recrystallization, gel filtration, chromatography, milling, drying, or blending.
  • Physical Map

    A map of the locations of identifiable landmarks on DNA (e.g., restriction-enzyme cutting sites, genes), regardless of inheritance. Distance is measured in base pairs. For the human genome, the lowest-resolution physical map is the banding patterns on the 24 different chromosomes; the highest-resolution map is the complete nucleotide sequence of the chromosomes.
  • Physical Map

    A map of the locations of identifiable landmarks on DNA (e.g., restriction enzyme cutting sites, genes), regardless of inheritance. Distance is measured in base pairs. For the human genome, the lowest-resolution physical map is the banding patterns on the 24 different chromosomes; the highest resolution map would be the complete nucleotide sequence of the chromosomes.
  • Physical Requirement

    (IEEE) A requirement that specifies a physical characteristic that a system or system component must posses; e.g., material, shape, size, weight.
  • Physical Segregation

    The separation of materials, spaces, or operations by means of physical barriers to prevent their mixing or overlap.
  • Physical Separation

    The separation of materials, spaces, or operations by means of physical barriers to prevent their mixing or overlap.
  • Phytoremediation

    The use of plants to clean up pollution.
  • PI

    Principal Investigator (NIH Guidelines)
  • PI

    Polyimide
  • PI

    Proportional and Integral