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  • Peripheral Nervous System (PNS)

    The nervous system that serves the limbs, trunk, and internal organs, i.e., all nerves except those of the brain, spinal cord, and visual system.
  • Peristaltic Pump

    A type of positive displacement pump that operates by pulsations of flow caused by passing rollers over flexible tubing. Operating pressure limited by tubing tolerance.
  • Permeability

    The ability of a body to pass a fluid under pressure.
  • Permeable

    Used of a membrane, cell or cell system through which substances may diffuse.
  • Permeate

    In reverse osmosis, the water that diffuses through the membrane, thereby becoming purified water; the part of a mixture that passes through a filter.
  • Permissible Exposure Limit (PEL)

    Controlled exposure to hazardous substances as established by health and safety authorities. In California, PELs are set by the Occupational Safety and Health Standards Board, and enforced by the Division of Occupational Safety and Health (DOSH). There are three types of Cal/OSHA PELs:1.The 8-Hour Time Weighted Average (TWA) is the average employee exposure over an 8-hour period, based on industrial hygiene monitoring. The measured level may sometimes go above the TWA value, as long as the 8-hour average stays below. All chemicals with PELs have a TWA value. Only a few chemicals have Ceiling and Excursion Limits.2.The Ceiling Limit is the maximum allowable level. It must never be exceeded, even for an instant.3.The Excursion Limit is a value that can be exceeded only for a specified short period of time (between 5-15 minutes), which is called the Excursion Duration. When there is an Excursion Limit for a substance, exposure must never exceed the Ceiling Limit, and the 8-hour average must remain at or below the TWA.The National Institute for Occupational Safety and Health (NIOSH) has the statutory responsibility for recommending exposure levels that are protective to workers. NIOSH has identified Recommended Exposure Limits (RELs) for 667 hazardous substances (NIOSH Pocket Guide to Chemical Hazards. DHHS Publication No. 94-116). The American Conference of Governmental Industrial Hygienists (ACGIH) has developed hundreds of exposure limits that are more protective than OSHA’s (Threshold Limit Values for Chemical Substances and Physical Agents and Biological Exposure Indices – 1994-1995). Many U.S. companies use the current ACGIH levels or other internal and more protective limits.For Permissible Exposure Limits see CFR 29 - 1910.1000, Subpart Z (Code of Federal Regulations 29 – Occupational Safety and Health Standards – Toxic and Hazardous Substances)
  • Permission

    The agreement of parent(s) or guardian to the participation of their child or ward in research. 45CFR46.402 ©
  • Permissions or Privileges

    Security codes that define or restrict which users can read, write, and execute the associated files, directories, or programs. Some departments need to look only at data, some need to input data or run programs, and others may not need to look at the data at all.
  • Permitted Daily Exposure

    (ICH Q3C (R4)) The maximum acceptable intake per day of residual solvent in pharmaceutical products.
  • Peroxisome

    Very small membrane-bound particles responsible for photorespiration in plants. Similar to lysosome in structure, but not in function.
  • Persistent Identifier (PI)

    A maintained reliable pointer to the identity, and also possibly its location, of a digital object through time.There are many types of PIs: the ISBN for physical books, and in some cases also electronic publications, provides a unique name, but not the location of the item. In the digital world the URI/URN identifies the resource, while the URL also locates the resource. The term Digital Object Identifier (DOI) is also used.
  • Personal Care Products

    Products used for personal hygiene or cosmetic care.
  • Personal Computer (PC)

    A computer that is functionally similar to large computers, but serves only one user. Synonymous: Microcomputer.
  • Personal Data

    Any information relating to an identified or identifiable natural person, the data subject. An identifiable person is one that can be identified, directly or indirectly, in particular by reference to an identification number or to one or more factors specific to his physical, physiological, mental, economic, cultural, or social identity.
  • Personal Protective Equipment (PPE)

    PPE refers to gowns, gloves, booties, hair covers, hoods, respiratory protection, face masks, etc. intended to protect an operator from risks associated with the product or process.NOTE: Respiratory Protective Equipment (RPE) covers devices designed only to protect the mouth and nose.
  • Personal Protective Equipment (PPE)

    Equipment designed to protect individuals from hazards or biohazards (e.g., gloves, eye protection, respirators).
  • Personal Representative

    A person authorized under state or other law to act on behalf of the individual in making health-related decisions. Examples include a court-appointed guardian with medical authority, a health care agent under a health care proxy, and a parent acting on behalf of an unemancipated minor (with exceptions where state law gives minors the right to make health decisions). For a decedent, the personal representative may be an executor, administrator, or other authorized person for matters concerning PHI.
  • Personnel

    Persons entering the cleanroom for any purpose. ISO 14644-5.
  • Personnel proprement formé (Appropriately trained personnel)

  • Personnel proprement formé (Appropriately trained personnel)

  • PES

    Polyethersulfone
  • PET

    Polyethylene Terephthalate
  • PET

    Positron Emission Tomography
  • PETG

    Polyethylene Teraphthalate Glycol
  • PETP

    Polyethylene Terephthalate