- 行业: Government
- Number of terms: 30456
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NOAA Coral Reef Conservation Program, National Oceanic and Atmospheric Administration, U.S. Department of Commerce
A network of fiber-like microtubules that forms in a cell's nucleus during mitosis (nuclear division) which connects the centrosomes to the kinetochores and helps move the chromosomes around .
Industry:Natural environment
A sexual zooid produced as a medusa bud upon a hydroid, sometimes becoming a free hydromedusa and sometimes remaining attached.
Industry:Natural environment
A technique used to analyze a photograph of a quadrat (photo-quadrat), in which a grid of random dots is placed over an image of the photo-quadrat. It assumes that the proportion of dots that lies on a substrate is equal to the proportional area of the substrate.
Industry:Natural environment
An area favored for birth or egg deposition and where juveniles and immature members of a community feed and grow. For example, mangrove root areas serve as nursery grounds for many coral reef fishes.
Industry:Natural environment
Any discrete area that is used by a species for reproduction or obtaining other resources, such as food and shelter; an area of distinct habitat type; patchiness occurs when a habitat is divided (fragmented)into usable areas, called "patches," which are separated from one another by nonusable habitat .
Industry:Natural environment
Describes an immobile organism because of its attachment to a substrate. The term has also been applied to organisms, such as anemones, that move very slowly.
Industry:Natural environment
In genetic engineering, an easily identified gene that is inserted into an organism, along with a desired gene. The presence of the marker gene demonstrates that the transformation was successful.
Industry:Natural environment
Membranes possessed by amniote (reptiles, birds, and mammals) embryos that allow these classes of vertebrates to be free of aquatic habitats for reproduction, and in their evolution, occupy terrestrial habitats. The membranes are the amnion, yolk sac, allantois and chorion.
Industry:Natural environment
