Weed

weed
(Science: botany) Any plant that is growing in a place where a human wants a different kindof plant or no plants at all. Any plant that crowds out cultivated plants.Clear of weeds; weed the garden.

Weed. An undesirable plant.
Weediness. Unwanted effects of a plant.
Wild type. An organism as found in nature; the organism before it is genetically engineered.

Klamath Weed
In 1946 two species of Chrysolina beetles were introduced into California to control the Klamath weed (also known as St. Johnswort, and the same plant that yields the popular herbal concoction) that was ruining millions of acres of ...

weed A plant not valued for its use or beauty and not intentionally planted; a category of hay fever plants that includes nongrass and nontree species.
weir Filtration apparatus in flame-cell protonephridia of flatworms.

A weed called mouse-eared cress has been designed to produce a biodegradable plastic called polyhydroxubutrate (PHB).
Possibilities for the Future ...

The cruciferous weed Arabidopsis thialiana has become a model system for the ... Systematic Relationships of Arabidopsis: A Molecular and Morphological ...
Full article ...

Weed Science
[edit] References
^ Winterborne J, 2005. Hydroponics - Indoor Horticulture [1]
^ Mann, J. (1987). Secondary Metabolism, 2nd ed.. Oxford: Oxford University Press, 186-187. ISBN 0-19-855529-6.
^ Hoek, C.van den, Mann, D.

Tussock: a hummock of grasses or sedges bound together by their roots Weed: a species that volunteers in artificially modified habitats and is considered undesirable by people.

When selection acts to weed out deleterious alleles, or causes an allele to sweep to fixation, it depletes genetic variation.

For example, transgenic crop plants capable of degrading weed killers allow farmers to spray weeds without affecting yield.

Some people are concerned that employers may try to use genetic information to weed out workers who are sick, or who may someday become sick, because of a genetic disorder.

mulch. A layer of material placed on the soil surface to prevent weed growth.
mummy. Unharvested nut remaining on the tree (also called sticktight); the crusty skin of an aphid whose inside has been consumed by a parasite.

FIG. 691- Dissection of brain-stem. Dorsal view. The nuclear masses of the medulla are taken from model by Weed, Carnegie Publication, No. 19. (See enlarged image) ...

Model organisms for developmental biology include the round worm Caenorhabditis elegans,[38] the fruit fly Drosophila melanogaster,[39] the zebrafish Danio rerio[40], the mouse Mus musculus,[41], and the weed Arabidopsis thaliana.

See also: Plant, Human, Species, Organ, Environment