BioScience Dictionary

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Found Order 244 times.

Displaying results 1 to 10.

1. Abrin (agglutinin, toxalbumin)
A highly poisonous protein found in the seeds of Abrus precatorius, the rosary pea. Abrin is toxic because it inhibits protein synthesis, causing symptoms such as internal bleeding, intestinal upset, and the irritation of mucous membranes. It was formerly used to treat some chronic eye disorders and it is currently being researched as a potential chemotherapy drug.

2. Acervulus
A flat, often round mass of hyphae which carry spore-bearing parts called conidophores; acervuli are found in fungi belonging to the order Melanconiales.

3. Achalasia
This is a disorder of esophageal peristalsis characterized by degeneration of the ganglion cells of the lower esophagus. This results in the failure of the relaxation of the cardiac sphincter during the passage of food. There is a potential of developing carcinoma of the esophagus in 5 to 10 % of such patients.

4. Acquired immunodeficiency syndrome (AIDS)
A collection of disorders that develop as a result of infection by the human immunodeficiency virus (HIV) , which attacks helper T cells , crippling the immune system and greatly reducing the body's ability to fight infection; results in premature death brought about by various diseases that overwhelm the compromised immune system.

5. Acromegaly
Acromegaly is a hormonal disorder in which there is excessive secretion of the growth hormone resulting in enlargement of hands, feet, face, tongue, jaws and internal organs. The cause is usually a benign pituitary adenoma .

6. Adenosine deaminase deficiency (ADA)
Inherited disorder caused by insufficient adenosine deaminase activity, resulting in a compromised immune system .

7. Adjacent wetlands
The term adjacent means bordering, continguous, or neighboring. Wetlands separated from other waters of the United States by man-made dikes or barriers, natural river berms, beach dunes, and the like are adjacent wetlands.

8. Allopurinol
An organic molecule used to treat gout and certain blood disorders by preventing excessive amounts of uric acid from building up in the blood. Formula: C5H4N4O. It is a derivative of the purine base hypoxanthine, and inhibits the enzyme xanthine oxidase.

9. Ameba (amoeba)
A common name describing the one-celled organism s classified under the order Amoebida of the class Sarcodina. An ameba has a constantly changing form and moves and eats by extending pseudopod s, or long fingers of itself, from its body cytoplasm.

10. Amniocentesis
A method of prenatal testing in which amniotic fluid is withdrawn from the uterus through a needle. The fluid and the fetal cells it contains are analyzed to detect biochemical or chromosomal disorders.

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