Algae
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  Algae



Algae

   A major group of lower plants that comprises, usually, photosynthetic plants of extremely varied morphology and physiology, and that is commonly considered to be a heterogeneous assemblage. They are freshwater and marine, terrestrial and subterranean; some are neustonic (living at the interface of water and the atmosphere). They live in various protozoa and within other plants. Among the vectors of aquatic algae are water movements (tides and currents), wind, ships, beetles, aquatic birds, etc. They live also in soil and on soil surfaces, on long-persistent snows, and in Antarctic rocks. Thermophilic algae inhabit hot springs. (From Webster, 3d ed; from Bold & Wynne, Introduction to the Algae, 2d ed, pp1-6)

RELATED TERMS
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Physiology
The branch of medicine that deals with the function of the various parts of the living organism.

Heterogeneous
Dissimilar in type, and having different or opposing characteristics.

Protozoa
Are microscopic animals that occur as single cells. Some protozoa can cause disease in humans. Protozoa form cysts, which are specialized cells like eggs that are very resistant to chlorine. Cysts can survive the disinfection process, then "hatch" into normal cells that can cause disease. Protozoa must be removed from drinking water by filtration, because they cannot be effectively killed by chlorine.

Algae
A major group of lower plants that comprises, usually, photosynthetic plants of extremely varied morphology and physiology, and that is commonly considered to be a heterogeneous assemblage. They are freshwater and marine, terrestrial and subterranean; some are neustonic (living at the interface of water and the atmosphere). They live in various protozoa and within other plants. Among the vectors of aquatic algae are water movements (tides and currents), wind, ships, beetles, aquatic birds, etc. They live also in soil and on soil surfaces, on long-persistent snows, and in Antarctic rocks. Thermophilic algae inhabit hot springs. (From Webster, 3d ed; from Bold & Wynne, Introduction to the Algae, 2d ed, pp1-6)



SIMILAR TERMS
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Algae, Blue Green
A subgroup of the oxygenic photosynthetic bacteria comprised of unicellular to multicellular photosynthetic bacteria possessing chlorophyll a and carrying out oxygenic photosynthesis. Cyanobacteria are the only known organisms capable of fixing both carbon dioxide (in the presence of light) and nitrogen. Formerly called blue-green algae, cyanobacteria were traditionally treated as algae. By the late 19th century, however, it was realized that the blue-green algae were unique and lacked the traditional nucleus and chloroplasts of the green and other algae. The comparison of nucleotide base sequence data from 16S and 5S rRNA indicates that cyanobacteria represent a moderately deep phylogenetic unit within the gram-negative bacteria.

Algae, Brown
Predominantly marine algae of the division Phaeophyta, having chromatophores containing carotenoid pigments. Genera include Ascophyllum, Fucus, Eisenia, Petalonia, Ectocarpus.

Algae, Green
Algae of the division Chlorophyta, in which the green pigment of chlorophyll is not masked by other pigments. Classes include Charophyceae, Bryopsidophyceae, Conjugatophyceae, Oedogoniophyceae, Chlorophyceae, and Prasinophyceae. Common genera are ACETABULARIA; CHLAMYDOMONAS; CHLORELLA; Nitella; PROTOTHECA; Scenedesmus, Spirogyra, and Volvox.

Algae, Red
Algae of the division Rhodophyta, in which the pigment is predominantly red; common genera are Gelidium, Gracilaria, and Polysiphonia.

Algal Blooms
Growth of a superabundance of algae and other microscopic plant life usually from an enrichment of a natural body of water by the addition of dissolved nutrients, especially nitrogen and phosphorus. It may be natural, induced (water pollution), or controlled (harvesting phytoplankton for food in an aquaculture system).

Algal Gene Products
Proteins found in any species of algae.

Algal Viruses
A family of DNA plant viruses that infect eukaryotic algae.

Algarrobo
A plant genus of the family FABACEAE that is a source of prosopis gum.



PREVIOUS AND NEXT TERMS
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Aleurodoidea
A large order of insects characterized by having the mouth parts adapted to piercing or sucking. It is comprised of four suborders: HETEROPTERA, Auchenorrhyncha, Sternorrhyncha, and Coleorrhyncha.

Alfamovirus
A genus of the family BROMOVIRIDAE with a wide host range. Transmission is by aphids and the type species is ALFALFA MOSAIC VIRUS.

Alfalfa mosaic viruses
The type species of the genus ALFAMOVIRUS that is non-persistently transmitted by aphids.

Alfadolone Mixture, Alfaxalone
A 3:1 mixture of alfaxalone with alfadolone acetate that previously had been used as a general anesthetic. It is no longer actively marketed. (From Martindale, The Extra Pharmacopoeia, 30th ed, p1445)

Algae, Blue Green
A subgroup of the oxygenic photosynthetic bacteria comprised of unicellular to multicellular photosynthetic bacteria possessing chlorophyll a and carrying out oxygenic photosynthesis. Cyanobacteria are the only known organisms capable of fixing both carbon dioxide (in the presence of light) and nitrogen. Formerly called blue-green algae, cyanobacteria were traditionally treated as algae. By the late 19th century, however, it was realized that the blue-green algae were unique and lacked the traditional nucleus and chloroplasts of the green and other algae. The comparison of nucleotide base sequence data from 16S and 5S rRNA indicates that cyanobacteria represent a moderately deep phylogenetic unit within the gram-negative bacteria.

Algae

Alfoscerate, Choline
A component of PHOSPHATIDYLCHOLINES (lecithins), in which the two hydroxy groups of GLYCEROL are esterified with fatty acids. (From Stedman, 26th ed) It counteracts the effects of urea on enzymes and other macromolecules.

Alfeprol
One of the ADRENERGIC BETA-ANTAGONISTS used as an antihypertensive, anti-anginal, and anti-arrhythmic agent.

Alfentanyl
A short-acting opioid anesthetic and analgesic derivative of FENTANYL. It produces an early peak analgesic effect and fast recovery of consciousness. Alfentanil is effective as an anesthetic during surgery, for supplementation of analgesia during surgical procedures, and as an analgesic for critically ill patients.

Algal Blooms
Growth of a superabundance of algae and other microscopic plant life usually from an enrichment of a natural body of water by the addition of dissolved nutrients, especially nitrogen and phosphorus. It may be natural, induced (water pollution), or controlled (harvesting phytoplankton for food in an aquaculture system).

Algal Gene Products
Proteins found in any species of algae.

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