This is the study of how to create computers that will learn from experience and modify their activity based on that learning (as opposed to traditional computers whose activity will not change unless the programmer explicitly changes it). This discipline is a sub-set of Artificial Intelligence.
For more information, visit Online Machine Learning Resources.
2. macroalgae
Author:
Definition:
Multicellular algae (green, blue-green and red algae) having filamentous, sheet or mat-like morphology.
3. macrobenthos
Author:
Definition:
Organisms (e.g., insect larvae) living in or on aquatic substrates and large enough to be seen with the naked eye.
4. macroevolution (adj. macroevolutionary)
Definition:
Evolution on a species level (speciation and extinction) and at higher taxonomic classifications (appearance and disappearance of genuses, families, orders, etc.).
5. macrofauna
Author:
Definition:
Animals large enough to be seen with the naked eye.
6. macroglia
Definition:
A part of the neuroglia. It consists of two types of astrocytes and two types of oligodendrocyte.
7. macroglossia
Author: Mirrored from
Guo Li's Dictionary of
On-Line Medical Resources
Definition:
Macroglossia is the medical term for an abnormally large tongue.
8. macrogyria (pachygyria)
Definition:
Abnormal coarseness or largeness of the ridgelike folds of the cerebral cortex (the gyri).
9. macroinfauna
Author:
Definition:
Animals living within aquatic sediments and large enough to be seen with the naked eye.
10. macroinvertebrate
Author:
Definition:
An invertebrate animal (animal without a backbone) large enough to be seen without magnification.
11. macromolecule
Definition:
A molecule with a molecular weight in excess of 1,000 daltons.
12. macronucleus (pl. macronuclei)
Definition:
One of two cellular nuclei found in the single-celled ciliated protozoan "tetrahymena." This nucleus contains only genes which are necessary for basic living and is in control of the organism's growth and reproduction (by binary fission) during optimal survival conditions.
13. macrophage (histiocyte)
Definition:
A type of large leukocyte that travels in the blood but can leave the bloodstream and enter tissue; like other leukocytes, it protects the body by digesting debris and foreign cells.
14. macrophyte
Author: Mirrored from
Dave Sutton's Aquatic Plant
Glossary
Definition:
A member of the macroscopic plant life of an area, especially of a body of water; large aquatic plant; the term 'aquatic macrophyte' has no taxonomic significance.
15. macrorestriction map
Definition:
Map depicting the order of and distance between sites at which restriction enzymes cleave chromosomes.
16. macroscopic
Author: Mirrored from
Dave Sutton's Aquatic Plant
Glossary
Definition:
Items large enough to be observed by the naked eye.
17. macroscopic pathology (gross pathology)
Author: Biological Sciences at
Heriot-Watt University
Definition:
Study of diseased tissues and tissue changes which are visible to the naked eye.
18. macrovascular diseases
Definition:
Macrovascular diseases afflict the larger blood vessels in the body and include coronary artery disease (arteriosclerosis and atherosclerosis), strokes, and peripheral vascular disease. People with diabetes and people who have hypertension, hyperlipidiemia, or high blood cholesterol levels are particularly at risk for developing these diseases.
19. macula (adj.: macular)
Author: Guo Li
Definition:
The macula of the eye is a small oval, yellowish area in the posterior retina.
20. macule
Author: Guo Li
Definition:
A macule is an area of skin with an abnormal color that is less than 1 cm in diameter. A macule is neither raised above nor depressed below the surrounding skin.
21. magnetic resonance imaging (MRI, NMRI)
Author: Guo Li
Definition:
Nuclear magnetic resonance imaging is a non-invasive imaging of the tissues that does not involve radiation. It provides better resolution for soft tissue imaging than radiation-based techniques.
22. magnetosomes
Author: Mirrored from
Tsute Chen's
Glossary of Microbiology
Definition:
Small particles of Fe3O4 present in cells that exhibit magnetotaxis.
23. magnetotactic bacteria
Author: Mirrored from
Tsute Chen's
Glossary of Microbiology
Definition:
Bacteria that can orient themselves in the earth's magnetic field due to the presence of magnetosomes.
24. magnetotaxis
Author: Mirrored from
Tsute Chen's
Glossary of Microbiology
Definition:
Movement toward the magnetic poles due to the presence of magnetosomes.
25. magnus (magn.)
Definition:
This Latin term, which is frequently used in medicine and pharmacy, means "large".
26. mainstem
Author:
Definition:
The principal, largest, or dominating stream or channel of any given area or drainage system.
27. major histocompatibility complex (MHC)
Author: Mirrored from
Tsute Chen's
Glossary of Microbiology
Definition:
28. malabsorption
Author: Guo Li
Definition:
Malabsorption is the state of poor absorption of nutritients from food.
29. malabsorption syndrome
Author: Guo Li
Definition:
Malabsorption syndrome is a loose term describing a number of conditions which are associated with intestinal malabsorption of nutrients: diarrhea, celiac disease, Whipple's disease, bacterial overgrowth of the small bowel (blind loop syndrome), lactase deficiency (lactose intolerance), etc.
30. malaise
Definition:
Malaise is a general feeling of discomfort and being unwell.
31. malaria
Definition:
A disease caused by a number of protozoan parasites from the genus Plasmodium and spread by female mosquitoes of the genus Anopheles. The four species of Plasmodium which cause malaria are P. vivax, P. ovale, P. malariae, and P. falciparum. The disease most commonly occurs in the tropics and subtropics, such as Central America, South America, Southeast Asia, the Caribbeans, the South Pacific Islands, and sub-Saharan Africa. Symptoms appear anywhere from a week to a month after the mosquito bite, and include high fever, shaking chills, sweats, headache, muscle aches, fatigue, anemia, and sometimes vomiting and coughing. If left untreated, symptoms progress to fluid in the lungs, liver failure, kidney failure, brain swelling, coma, and death.
For more information, visit Malaria Fact Sheet.
32. malathion
Image:
View the
chemical structure
Definition:
A yellowish, liquid organic phosphorous compound that is used as an insecticide. It has fairly low toxicity to humans and other mammals, and is especially effective against the Mediterranean fruit fly.
33. malformation
Author: Guo Li
Definition:
Malformation is the abnormal development of an organ or body part.
34. malignancy
Author: Biological Sciences at
Heriot-Watt University
Definition:
