General

General

General nature or nature terms.

Industry: Natural environment

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General

neurotoxin

Biology; General

Chemical that paralyzes nerves. Neurotoxins are produced by a variety of organisms, most notably some of the heterotrophic dinoflagellates.

node

Biology; General

The stem region of a plant where one or more leaves attach. Where leaves are attached to stems.

The failure of chromosomes to separate properly during cell division. The unequal segregation of chromosomes during meiosis. This forms cells with either too many (possibly one or more single or sets ...

nonvascular plants

Biology; General

Plants lacking lignified vascular tissue (xylem), vascularized leaves, and having a free-living, photosynthetic gametophyte stage that dominates the life cycle. Common examples are the mosses and ...

norepinephrine

Biology; General

A hormone produced in the adrenal medulla and secreted under stress; contributes to the "fight or flight" response.

notochord

Biology; General

In chordates, a cellular rod that runs the length of the body and provides dorsal support. Also, a structure of mesoderm in the embryo that will become the vertebrae of the spinal column. The stiff ...