Definitions beginning with G

A phenomenon in plants, in which a pollen grain is genetically incapable of fertilizing a particular egg, because both gametes carry the identical allele at an incompatibility locus (usually denoted S). This is a mechanism for forcing crossfertilization.
UN Food and Agriculture Organization - Cite This Source - This Definition
Browse Related Terms: dizygotic twins, gestation, identical twin, monozygotic twin, progesterone

Gamma - permalink - collapse

All > Science > Weather

A unit of magnetic field intensity equal to 1 x 10.0^-5 Gauss; also equal to 1 nanotelsa (nT).
NOAA National Weather Service - Cite This Source - This Definition
Browse Related Terms: Gauss, Geophysics, Nanotesla (nT)

gamma correction - permalink - collapse

All > Technology > Telecommunications

In video, the insertion of a nonlinear output-input characteristic for the purpose of changing the system transfer characteristic. [IEEE 100] Note: Historically, gamma correction was a precompensation applied to the video signal at the camera to correct for the nonlinearities of the CRT (i.e., the power function of the electron gun) and, as such, it was the inverse of the electron gun function. It is now widely used, however, to describe "the total of all transfer function manipulations" (i.e., including departures from a true power-law function), whether inherent or intentionally introduced to act upon the video signal for the purpose of reducing the bandwidth for signal processing, making the image on the final display conform to preconceived artistic objectives, or providing noise suppression, or even bit-rate reduction.
ATIS - Cite This Source - This Definition
Browse Related Terms: artifact, coded image, graphics, image capture, judder, still image, telegraphy

Gamma-interferon - permalink - collapse

All > Science > Biotechnology and Genetics > Stem Cell

A type of small protein with antiviral activity, made by T lymphocytes.
The President's Council on Bioethics - Cite This Source - This Definition
Browse Related Terms: lymph nodes, Lymphatic system, lymphocyte, lymphoid

gamma irradiation - permalink - collapse

All > Medicine > Cancer

A type of radiation therapy that uses gamma radiation. Gamma radiation is a type of high-energy radiation that is different from x-rays.
National Cancer Institute - Cite This Source - This Definition
Browse Related Terms: dosimetry, gamma ray, irradiation, radiation therapy, radiotherapy

Gamma Knife therapy - permalink - collapse

All > Medicine > Cancer

A treatment using gamma rays, a type of high-energy radiation that can be tightly focused on small tumors or other lesions in the head or neck, so very little normal tissue receives radiation. The gamma rays are aimed at the tumor from many different angles at once, and deliver a large dose of radiation exactly to the tumor in one treatment session. This procedure is a type of stereotactic radiosurgery. Gamma Knife therapy is not a knife and is not surgery. Gamma Knife is a registered trademark of Elekta Instruments, Inc.
National Cancer Institute - Cite This Source - This Definition
Browse Related Terms: abdominal x-ray, chest x-ray, fluoroscope, fluoroscopy, neuroradiologist, prophylactic cranial irradiation, radiation fibrosis, radiologic exam, radiologist, Radiotherapeutic ablation, thoracodynia, x-ray

gamma ray - permalink - collapse

All > Medicine > Cancer

A type of high-energy radiation that is different from an x-ray.
National Cancer Institute - Cite This Source - This Definition
Browse Related Terms: dosimetry, gamma irradiation, irradiation, radiation therapy, radiotherapy

All > Science > Weather

A type of electromagnetic radiation with a very short wavelength and high energy level. Generally, emitted during radioactive decay of a substance.
NOAA National Weather Service - Cite This Source - This Definition
Browse Related Terms: blackbody, Blackbody Radiation, dispersion, Graybody, Longwave Radiation, Microwave, Photosphere, radiation, Radiation Laws, Shortwave radiation, ultraviolet radiation, Visual Spectrum, X-Rays

All > Technology > Defense

Electromagnetic radiation resulting from nuclear transitions. Although incorrect, high-energy radiation, particularly bremsstrahlung , is sometimes referred to as gamma radiation.
DoD Missile Defense Agency - Cite This Source - This Definition
Browse Related Terms: Coherence, CRT, Electromagnetic Radiation (EMR), ionizing radiation, Nuclear Radiation, radiation, Radioactivity, Scattering, Thermal X-Rays, Ultraviolet (UV), X-Rays

Gamma-Ray Laser - permalink - collapse

All > Technology > Defense

A laser which generates a beam of gamma rays; also called a graser . A gamma-ray laser, if developed, would be a type of x-ray laser; although it would employ nuclear reactions, it need not (but might) employ nuclear fission or fusion reactions or explosions.
DoD Missile Defense Agency - Cite This Source - This Definition
Browse Related Terms: GRASER, Laser Weapons, X-Ray Laser (XRL), XRL

GAMS - permalink - collapse

All > Technology > Defense

GPS (Global Positioning System)-Aided Munitions.
DoD Missile Defense Agency - Cite This Source - This Definition
Browse Related Terms: GBD, GPS, HOB

ganciclovir - permalink - collapse

All > Medicine > Cancer

An antiviral agent used to prevent or treat cytomegalovirus infections that may occur when the body's immune system is suppressed. In gene therapy, ganciclovir is used with an altered herpes simplex virus-1 gene to kill advanced melanoma cells and brain tumor cells.
National Cancer Institute - Cite This Source - This Definition
Browse Related Terms: CA-125, cancer antigen 125, CAP-1, carcinoembryonic antigen peptide-1, immunomodulation, peptide 946, ras peptide

Ganglia - permalink - collapse

All > Technology > Parallel Computing > Grid Computing

A cluster monitoring tool (re: WS MDS). See http://ganglia.sourceforge.net.

Globus Toolkit - Cite This Source - This Definition
Browse Related Terms: Message Passing Interface (MPI), PureTLS, superuser do (sudo), Web Services Description Language for Java Toolkit (WSDL4j), XML::DB

ganglioside - permalink - collapse

All > Medicine > Cancer

A complex molecule that contains both lipids (fats) and carbohydrates (sugars) and is found in the plasma (outer) membrane of many kinds of cells. Several different types of gangliosides have been identified.
National Cancer Institute - Cite This Source - This Definition
Browse Related Terms: enveloped virus, Lysis, Lytic, nonlytic

Gangrene - permalink - collapse

All > Medicine > Diabetes

A form of a wet or dry infection, frequently seen in diabetes causing decay and dying of tissue in a localized part of the body or involve an organ or a limb because of an obstruction or loss of blood supply, injury, or disease resulting from arteriosclerosis.
CA DMV - Cite This Source - This Definition
Browse Related Terms: Autoimmune process, Autonomic Neuropathy, calluses, corns, Foot Ulceration, hyperparathyroidism, Hypoparathyroidism, Rest Pain, Topical Burning, ulcer, Warning Symptoms, yeast infection

Gank - permalink - collapse

All > Recreation > Games > World of Warcraft

A PvP fight were one side is seriously outnumbered, and have no chance of victory. Often just one character being attacked by four or five others.
Stratics - Cite This Source - This Definition
Player vs. Player: To attack another player while they're trying to fight a monster.
Blizzard Entertainment - Cite This Source - This Definition
Gang Killing. Also used to mean bullying of lower level players in PvP or to kill a player while he is engaged with a monster.
worldofwar.net - Cite This Source - This Definition
Browse Related Terms: Carebear, Combat Pets, guild master (gm), Pet, PvE, PvP, RAID (Redundant Array of Independent or Inexpensive Disks), Small Pets, Zerg

GaNMPA - permalink - collapse

All > Technology > Defense

Gallium Nitride Microwave Power Amplifiers. (A demonstration program to develop GaN based transistors and integrated circuits for power amplifiers in systems such as Ground Based Radar. Goal is to reduce total weight and size by a factor of 10).
DoD Missile Defense Agency - Cite This Source - This Definition
Browse Related Terms: ASIC, CCTV, GVSC, IC, LIVEX, LSI, MMIC, TIC, VHSIC, VLSIC

Gantry - permalink - collapse

All > Science > Water

An overhead structure that supports machines or operating parts, such as a gantry crane.

Bureau of Reclamation - Cite This Source - This Definition
Browse Related Terms: Derrick, Gantry crane

Gantry crane - permalink - collapse

All > Science > Water

A fixed or traveling, bent-supported crane for handling heavy equipment.

Bureau of Reclamation - Cite This Source - This Definition
Browse Related Terms: Derrick, Gantry

Pages: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60

Home (49,845) > A B C D E F G H I J K L M N O P Q R S T U V W X Y Z #

ExpertGlossary

gametoclone - permalink - collapse

gametogenesis - permalink - collapse

gametophyte - permalink - collapse

gametophytic incompatibility - permalink - collapse

Gamma - permalink - collapse

gamma correction - permalink - collapse

Gamma-interferon - permalink - collapse

gamma irradiation - permalink - collapse

Gamma Knife therapy - permalink - collapse

gamma ray - permalink - collapse

Gamma-Ray Laser - permalink - collapse

GAMS - permalink - collapse

ganciclovir - permalink - collapse

Ganglia - permalink - collapse

ganglioside - permalink - collapse

Gangrene - permalink - collapse

Gank - permalink - collapse

GaNMPA - permalink - collapse

Gantry - permalink - collapse

Gantry crane - permalink - collapse