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  • Autotrophy

    Autotrophy is the capacity of an organism to use light as the sole energy source in the synthesis of organic material from inorganic elements or compounds. Autotrophic organisms include green photosynthesizing plants and some photosynthetic bacteria.

  • Auxiliary Label

    An additional label applied to already packaged and labeled supplies to update or add additional/new information (e.g., Change to storage Conditions, review date updates). Also referred as Ancillary Label

  • Auxiliary Storage

    Storage device other than main memory (RAM); e.g., disks and tapes.

  • AV

    Atrioventricular

  • Availability

    A reflection of the form and location of nutritional elements and their suitability for absorption. In tissue culture media this is related to the abundance of each nutritional element, the osmotic concentration and pH of the medium, the stability and solubility of the item in question, the presence of absorbing agents in the media, and other factors.

  • AVEG

    AIDS Vaccine Evaluation Group

  • Average Airflow Rate

    Averaged volume of air per unit time, to determine the air exchange rate in a cleanroom or clean zone.NOTE: Air flow rate is expressed in cubic meters per hour (m³/h).ISO 14644-3.

  • Avirulent

    Unable to cause disease.

  • Avuncular Relationship

    The genetic relationship between nieces and nephews and their aunts and uncles.

  • AW

    Arc Welding

  • AWS

    American Welding Society

  • AWWA

    American Water Works Association

  • Axenic

    Not contaminated by or associated with any other living organisms. Usually used in reference to pure cultures of microorganisms that are completely free of the presence of other organisms. Also used to denote “germ-free” animals born and raised in a sterile environment.

  • Axenic

    A single organism in culture that is not contaminated by, or associated with, any foreign organism. Also used to denote “germ free” animals born and raised in sterile environment.

  • Axenic Culture

    Free of external contaminants and internal symbionts; generally not possible with surface sterilization alone, and incorrectly used to indicate aseptic culture.

  • Azeotrope

    A blend of two or more components with equilibrium vapor phase and liquid phase compositions that are the same at a given temperature and pressure.