Flu, stomach
Flu, stomach: A gastrointestinal illness caused by a microorganism. Stomach flu is not related to the influenza (flu) virus.
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Fluctuating rib: One of the last two ribs. A rib is said to be “fluctuating” if it does not attach to the sternum (the breast bone) or to another rib. There are usually 12 pairs of ribs in all. Each pair of ribs is attached to the building blocks of the spine (the vertebrae) in […]
- Fluid, cerebrospinal (CSF)
Fluid, cerebrospinal (CSF): A watery fluid, continuously produced and absorbed, which flows in the ventricles (cavities) within the brain and around the surface of the brain and spinal cord. The CSF is produced by the choroid plexus, a series of infolded blood vessels projecting into the cerebral ventricles, and it is absorbed into the venous […]
- Fluorescein angiography
Fluorescein angiography: A test to examine blood vessels in the retina, choroid, and iris of the eye. A special dye is injected into a vein in the arm and pictures are taken as the dye passes through the blood vessels in the eye. The dye is injected into a vein in the arm. The pictures […]
- Fluorescent in situ hybridization
Fluorescence in situ hybridization: An important molecular cytogenetic method for identifying chromosomes and parts of chromosomes, deciphering chromosome rearrangements, and locating genes on chromosomes. “Fluorescence” means emitting light that comes from a reaction within the emitter. “In situ” refers to the fact that this techniques is done with the chromosomes, cells or tissue in place […]
- Fluorescent microscope
Fluorescent microscope: A microscope equipped to examine material that fluoresces under ultraviolet light. Fluorescence microscopy is based on the principle that fluorescent materials emit visible light when they are irradiated with ultraviolet rays or with violet-blue visible rays.