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  • RFLP

    Restriction Fragment Length Polymorphism

  • RFP

    Request for Proposal

  • RFQ

    Request for Quotation

  • RGV

    Radio frequency Guided Vehicle

  • RH

    Relative Humidity

  • RHC

    Reheat Coil

  • Rheology

    Study of the flow of matter such as fermentation liquids.

  • Rheumatoid Arthritis (RA)

    An autoimmune disease that causes chronic inflammation of the joints. Rheumatoid arthritis can also cause inflammation of the tissue around the joints, as well as in other organs in the body. RA is referred to as a systemic illness and is sometimes called rheumatoid disease.

  • RHI

    Renewable Heat Incentive

  • RHI

    Regional Harmonization Initiatives (ICH)

  • Rhizobium

    A class of microorganisms that converts atmospheric nitrogen into a form that plants can utilize for growth. Species of this microorganism grow symbiotically on the roots of certain legumes, such as peas, beans and alfalfa.

  • RI

    Refractive Index

  • RIA

    Radio Immuno Assay

  • Ribonuclease

    Any enzyme that hydrolyzes RNA.

  • Ribonucleic Acid (RNA)

    A molecule consisting of a number of ribonucleotides attached together to form a long strand one nucleotide thick. Each nucleotide contains the sugar, ribose, and one of four different bases: cytosine, adenine and guanine (as in DNA) and uracil (as opposed to thymine in DNA). The major portion of cellular RNA occurs as ribosomal RNA (rRNA), to a lesser extent as transfer RNA (tRNA) and less still as messenger RNA (mRNA), all three forms being concerned with transformation of the DNA sequence into the complementary protein sequence. It also occurs in some viruses where it acts as the hereditary material.

  • Ribonucleotide

  • Ribose

    The five-carbon sugar that serves as a component of RNA.

  • Ribosomal RNA

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  • Ribosome

    The sub-cellular structure that contains both RNA and protein molecules and mediates the translation of mRNA into protein. Ribosomes comprise large and small sub-units.

  • Ribosomes

    Small cellular components composed of specialized ribosomal RNA and protein; site of protein synthesis.

  • Rickettsias

    Gram-negative microorganisms that are often carried by arthropod vectors and may infect humans and other mammals. Generally smaller than other bacteria, they require living cells for growth.

  • Rinse

    The operation that follows regeneration, a flushing out of excess regenerant solution.

  • Rinsing

    Action using a liquid, generally water, to remove and in some cases dissolve a soil.(also see: Flushing)

  • RISC

    Reduced Instruction Set Computer

  • Risk

    (IEEE) A measure of the probability and severity of undesired effects. Often taken as the simple product of probability and consequence.