AFP

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alpha

 [al´fah]
the first letter of the Greek alphabet, α; used to denote the first position in a classification system; as, in names of chemical compounds, to distinguish the first in a series of isomers, or to indicate the position of substituent atoms or groups; also used to distinguish types of radioactive decay, brain waves or rhythms, adrenergic receptors, and secretory cells that stain with acid dyes, such as the alpha cells of the pancreas.
alpha-adrenergic blocking agent (alpha-blocker) (alpha-blocking agent) any of a group of drugs that selectively inhibit the activity of alpha receptors in the sympathetic nervous system. As with beta-adrenergic blocking agents, alpha-blocking agents compete with the catecholamines at peripheral autonomic receptor sites. This group includes ergot and its derivatives, and phentolamine.
alpha chain disease the most common heavy chain disease, occurring predominantly in young adults in the Mediterranean area, and characterized by plasma cell infiltration of the lamina propria of the small intestine resulting in malabsorption with diarrhea, abdominal pain, and weight loss, or, exceedingly rarely, by pulmonary involvement. The gastrointestinal form is immunoproliferative small intestine disease.
alpha-fetoprotein (AFP) a plasma protein produced by the fetal liver, yolk sac, and gastrointestinal tract and also by hepatocellular carcinoma, germ cell neoplasms, and other cancers in adults; elevated levels may also be seen in benign liver disease such as cirrhosis and viral hepatitis. The serum AFP level is used to monitor the effectiveness of cancer treatment.

During pregnancy some AFP crosses from the amniotic fluid to the mother's blood. If the fetus has a neural tube defect, large amounts of AFP will be found in the amniotic fluid and maternal blood. Blood screening tests for serum AFP can thus be done as a first step in the screening process; if test results are positive, further testing is indicated to diagnose the defect.
alpha particles a type of emission produced by the disintegration of a radioactive substance. The atoms of radioactive elements such as uranium and radium are very unstable, continuously breaking apart with explosive violence and emitting particulate and nonparticulate types of radiation. The alpha particles, consisting of two protons and two neutrons, have an electrical charge and form streams of tremendous energy when they are released from the disintegrating atoms. These streams of energy (alpha rays) can be used in treatment of various malignancies. See also radiation and radiation therapy.

AFP

Abbreviation for α-fetoproteins. See: fetoproteins.

AFP

alpha fetoprotein.

AFP

abbr.
alpha-fetoprotein

AFP

abbreviation for alpha-fetoprotein.

AFP

A gene on chromosome 4q11-q13 that encodes alpha-fetoprotein, a major plasma protein produced by the yolk sac and the liver during foetal life. AFP is regarded as the foetal counterpart of serum albumin and binds copper, nickel, fatty acids and bilirubin; hereditary persistance of alpha-fetoprotein may be found in individuals with no obvious pathology.

Molecular pathology
AFP is elevated in foetuses with neural tube defects, including spina bifida and anencephaly. It is elevated in adults with hepatocellular carcinomas and germ cell tumours.

AFP

α-fetoprotein, see there.

AFP

Abbreviation for alpha(α) fetoprotein test.

AFP (Alpha-fetoprotein)

A tumor marker associated with liver, testicular, and ovarian cancer.
Mentioned in: Tumor Markers

AFP

alpha-fetoprotein.
References in periodicals archive ?
The AppleTalk networking protocols are, much like the Macintosh itself, elegant in design and simple to use.
The set-up, configuration, administration and operation of most other networks requires much more knowledge of networking and computer technology than is generally necessary with an AppleTalk network.
Unfortunately, AppleTalk is not universally available as a way to network with non-Apple computers.
While AppleTalk provides the best user interface for the Mac, TCP/IP can be used to supplement it for wider connectivity and access to UNIX host computers.
This assumes, however, that the individual has recent versions of the system software for the Macs and that he or she has read the appropriate parts of the manuals for the LaserWriter and AppleTalk installations.
Alternatively, if PhoneNet could be installed on existing wire pairs, and if any of the department machines had or could be equipped with a SCSI hard disk, a local AppleTalk network could be set up to provide most of the departmental sharing functioins with far greater convenience to the faculty and staff.
Only TCP/IP protocol will provide connectivity to supercomputers, NSFNET and UNIX computers, but AppleTalk is a suitable choice for the shared Mac file access and LaserWriter support.
Groups of three students collaborate as teams through restricted-access shared folders on a server in the instructional lab, but may do so from any of six Macintosh laboratories across the campus, each of which has an AppleTalk network interconnected through the campus internet.
Each AppleTalk network also has an AppleShare server for local applications.
He and his coworkers have found that the performance for PacerLink users suffers occasionally with heavy file transfer activity from PacerShare and AppleShare users on the same AppleTalk network.

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