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Gamete
Mature male or female reproductive cell (sperm or ovum) with a haploid set
of chromosomes (23 for humans).
Gamma Globulin
A blood protein that plays a major role in the process of immunity.
Sometimes the term "gamma globulin" refers to a whole group of
blood proteins that are known as antibodies or immunoglobulins (Ig). Most
often, however, it applies to a particular immunoglobulin, designated as
IgG, believed to be the most abundant type of antibody in the body.
Gas Metal Arc Welding (GMAW)
An arc welding process that produces coalescence of metals by heating them
with an arc between a continuous filler metal (consumable) electrode and the
work. Shielding is obtained entirely from an externally supplied gas or gas
mixture. Some variations of this process are called MIG (Metal Inert Gas) Or
CO2 welding, nonpreferred terms.
Gas Room
A separately ventilated, fully enclosed room in which only toxic and highly
toxic compressed gases and associated equipment and supplies are stored or
used.
Gas Tungsten Arc Welding (GTAW)
An arc welding process that produces coalescence of metals by heating them
with an arc between a tungsten (nonconsumable) electrode and the work.
Shielding is obtained from a gas or gas mixture. Pressure may or may not be
used and filler material may or may not be used. (This process is sometimes
called TIG (Tungsten Inert Gas) welding, a nonpreferred term).
Gel
A colloid, where the dispersed phase is liquid and the dispersion medium is
solid.
Gel Electrophoresis
A DNA separation technique that is very important in DNA sequencing.
Standard sequencing procedures involve cloning DNA fragments into special
sequencing cloning vectors that carry tiny pieces of DNA. The next step is
to determine the base sequence of the tiny fragments by a special procedure
that generates a series of even tinier DNA fragments that differ in size by
only one base. These nested fragments are separated by gel electrophoresis,
in which the DNA pieces are added to a gelatinous solution, allowing the
fragments to work their way down through the gel. Smaller pieces move faster
and will reach the bottom first. Movement through the gel is hastened by
applying an electrical field to the gel. (
Gel Polarization
The phenomenon of formation of a layer of insoluble/semi-soluble material
at a liquid/filter interface. It is a common occurrence with excessive
linear velocity flow through filters of colloidal suspensions and
macromolecular solutions.
Gelatin
A derived protein formed from the collagen of the tissues by boiling in
water, sometimes called an albuminoid, though it lacks the characteristic
albuminoid properties. Glue, size, and isinglass are forms of gelatin.
Gene
A natural unit of hereditary material that is the physical basis for the
transmission of the characteristics of living organisms from one generation
to another. The basic genetic material is fundamentally the same in all
living organisms. It consists of deoxyribonucleic acid (DNA) in most
organisms and ribonucleic acid (RNA) in certain viruses, and is usually
associated in a linear arrangement that, in part, constitutes the
chromosome. The average length of a gene is 1µm and thus, about one
million genes could be contained in a one-meter stretch of DNA. The segment
of DNA that is involved in producing a polypeptide chain, it includes
regions preceding (leader) and following (trailer) the coding region as well
as intervening sequences (introns) between individual coding segments
(exons).
Gene Expression<
The process by which a gene's coded information is converted into the
structures present and operating in the cell. Expressed genes include those
that are transcribed into mRNA and then translated into protein and those
that are transcribed into RNA but not translated into protein
Gene Family
Group of closely related genes that makes similar products.
Gene Mapping
Determination of the relative positions of genes on a DNA molecule
(chromosome or plasmid) and of the distance, in linkage units or physical
units, between them.
Gene Markers
Landmarks for a target gene, either detectable traits that are inherited
along with the gene, or distinctive segments of DNA.
Gene Product
The biochemical material, either RNA or protein, resulting from expression
of a gene. The amount of gene product is used to measure how active a gene
is; abnormal amounts can be correlated with disease causing alleles.
Gene Sequencing
The determination of the sequence of bases in a DNA strand. The two most
widely used methods are the chain-termination method, developed by Sanger in
the mid-seventies, and the chemical method developed by Maxam & Gilbert
around the same time.
Gene Splicing
The enzymatic attachment of one gene or part of a gene to another.
Gene Therapy
The insertion of normal DNA directly into cells to correct a generic
defect.
Generic Drug
A drug produced and marketed under its chemical or "generic" name
(e.g. acetaminophen) as opposed to "Tylenol", a brand name for the
former produced by Johnson & Johnson. A generic drug can be sold only
after a proprietary drug goes off patent (i.e. when the patent runs out
after 17 years). There are numerous generic drug manufacturers. While
generic drugs are cheaper for consumers, they still must meet the standards
of GMPs as set out by the FDA.
Genetics
The scientific study of heredity: how particular qualities or traits are
transmitted from parents to offspring.
Genetic Code
The sequence of nucleotides, coded in triplets (codons) along the mRNA that
determines the sequence of amino acids in protein synthesis. The DNA
sequence of a gene can be used to predict the mRNA sequence, and the genetic
code can in turn be used to predict the amino acid sequence.
Genetic Diseases
Diseases that occur because a mutation in the genetic material.
Genetic Engineering
The selective, deliberate alteration of genes by technological means.
Genetic Engineering Technology
Genetic Map
Genome/B>
The full complement of chromosomes and extra-chromosomal DNA coding for
cellular proteins, contained within each cell of a given species. Its size
is generally given as total number of base pairs. (also see:
Genome Project
Research and technology development effort aimed at mapping and sequencing
some or all of the genome human beings and other organisms.
Genomic Library
A collection of clones made from a set of randomly generated overlapping
DNA fragments representing the entire genome of an organism.
Genomic Sequence
The order of the subunits, called bases, that makes up a particular
fragment of DNA in a genome. DNA is a long molecule made up of four
different kinds of bases, which are abbreviated A, C, T, and G. A DNA
fragment that is 10 bases long might have a base sequence of, for example,
ATCGTTCCTG. The particular sequence of bases encodes important information
in an individual's genetic blueprint, and is unique for each individual
(except identical twins).
Genotype
The genetic composition of an organism (including expressed and
nonexpressed genes), which may not be readily apparent.
Germicidal Lamps
Light sources that emit ultraviolet radiation at a wavelength of 254
nanometers. These lights are commonly found in biological safety cabinets
and used to inactivate bacteria, viruses and fungi which are either airborne
or on exposed surfaces.
Germicide
An agent that destroys microorganisms, especially pathogenic microorganisms
("germs"). Sterilants, disinfectants, and antiseptics are
germicides.
Germplasm
The total genetic variability, represented by germ cells or seeds,
available to a particular population of organisms.
GMP Critical Parameter
A parameter that has a direct effect on product quality.
GMP Facility
A production facility or clinical trial materials pilot plant for the
manufacture of pharmaceutical products. It includes the manufacturing space,
the storage warehouse for raw and finished product, and support lab areas. A
GMP facility operates under the guidelines established by the CFR (Code of
Federal Regulations) Title 21, Parts 225 (Current Good Manufacturing for
Medicated Feeds - Subpart B), and Part 226 (Current Good Manufacturing
Practice for Type A Medicated Articles - Subpart B).
Golgi Bodies
Very small particles composed of membrane aggregates and responsible for
the secretion of certain enzymes and macromolecules. Golgi bodies are the
deposition and packaging site for many excreted products.
Good Engineering Practice (GEP)
A combination of standards, specifications, codes, regulatory and
industrial guidelines as well as accepted engineering and design methods
intended to design, construct, operate, and maintain pharmaceutical and/or
biotechnology facilities taking into account not only regulatory compliance
but also safety, economics, environmental protection and operability.
Standards and specifications are provided by recognized sources such as
established engineering and architectural contractors as well as
pharmaceutical companies. Codes are provided by local, state, or federal
jurisdictions and/or insurance companies. Guidelines are issued by
professional societies, industrial organizations, or regulatory agencies.
Engineering design methods have been established throughout the engineering
educational system.
Good Large Scale Practice Organism (GLSP)
The National Institutes of Health (NIH) specifies physical containment
levels and defines Biosafety Levels for Large Scale in their "Guidelines
for Research Involving Recombinant DNA Molecules" - Appendix K - May
1999. Level of physical containment recommended for large-scale (more than
10 liters of culture) research or production involving viable,
non-pathogenic, and non-toxigenic recombinant strains derived from host
organisms that have an extended history of safe large scale use. Likewise,
the GLSP level of physical containment is recommended for organisms that
have a built-in environmental limitation that permits optimum growth in
large-scale bioreactors, but limited survival if released to the
environment.
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Pharmaceutical Abbreviations
| Abbreviations in product
information leaflets and literature
Acronyms | Glossary
of Terms | Abbreviations
used in the British Pharmaceutical