Nucleus
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  Nucleus



Nucleus

    Plural: nuclei. The compartment of a cell that contains the chromosomes.

RELATED TERMS
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Nuclei
See nucleus.

Cell
Fundamental structural unit of all life. The cell consists primarily of an outer plasma membrane, which separates it from the environment; the genetic material (DNA), which encodes heritable information for the maintainance of life; and the cytoplasm, a heterogeneous assemblage of ions, molecules, and fluid.



SIMILAR TERMS
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Nuclear Medicine
Imaging technique where small amounts of radioactive substances (radio-isotopes) are injected into a patient to trace disease processes. Sometimes the radioactive substance may concentrate directly in an organ/tissue, but in most cases it has to be attached to a carrier molecule with a "preference" for a certain tissue or disease process. The concentrated radioactivity may be detected by a so-called gamma camera as typical "hot spots".

Nuclear medicine
The branch of medicine that deals with the use of radioisotopes in therapy and diagnosis.

Nuclear medicine imaging techniques
Techniques that are used in the diagnosis, management, treatment and prevention of disease. Nuclear medicine is unique in that it often allows for diagnostic information to be discerned prior to the onset of physical symptoms. It is used significantly in the areas of oncology, neurology, cardiology and orthopedics, among others.

Nuclear medicine scan
Image produced as the result of a nuclear medicine procedure.

Nuclear scan
Nuclear imaging is a method of producing images by detecting radiation from different parts of the body after the administration of a radioactive tracer material.

Nuclear scanning


Nuclear transfer
A procedure in which a nucleus from a donor cell is transferred into an enucleated egg or zygote (an egg or zygote from which the nucleus/pronuclei have been removed). The donor nucleus can come from a Germ cell or a somatic cell.

Nuclei
See nucleus.

Nucleotides
The components of DNA, consisting of phosphate, a sugar derivative and one of the following bases: adenine, cytosine, guanine, or thymine. They are represented by their initial letters in a nucleotide sequence.

Nucleus of the optic tract (NOT)
Receives input from directionally sensitive cells in the retina. Lesions produce deficits in tracking of moving stimuli.



PREVIOUS AND NEXT TERMS
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Nuclear medicine imaging techniques
Techniques that are used in the diagnosis, management, treatment and prevention of disease. Nuclear medicine is unique in that it often allows for diagnostic information to be discerned prior to the onset of physical symptoms. It is used significantly in the areas of oncology, neurology, cardiology and orthopedics, among others.

Nuclear medicine scan
Image produced as the result of a nuclear medicine procedure.

Nutcracker syndrome
Abnormal muscle tightening in the esophagus.

Nuclear transfer
A procedure in which a nucleus from a donor cell is transferred into an enucleated egg or zygote (an egg or zygote from which the nucleus/pronuclei have been removed). The donor nucleus can come from a Germ cell or a somatic cell.

Nuclei
See nucleus.

Nucleus

Natural family planning
A method of preventing pregnancy without the aid of drugs or devices. Women monitor their body's signs to determine when they are and are not fertile.

Navel
The impression or scar on the middle of the belly left after the umbilical cord falls off.

Neck righting reflex
The tendency for a newborn to lie with one arm crooked and raised behind the head while the other is extended away from the body. This reflex will disappear shortly after birth.

Neonatal
The period of time from birth to 4 weeks of age.

Neonatal intensive care unit
An intensive care unit designed specially for newborns in need ofspecial care, including premature, low-birthweight, and seriously illinfants.

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