General

General

General nature or nature terms.

Industry: Natural environment

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General

sieve cells

Biology; General

Conducting cells in the phloem of vascular plants. See sieve elements.

A sedimentological and biological "fossil" representing colonies of bacteria altenating with layers of sediments. Becoming more common during the Proterozoic, stromatolites persist today in marine ...

systole

Biology; General

The contraction of the ventricles that opens the semilunar valve and forces blood into the arteries.

sieve elements

Biology; General

Tubular, thin-walled cells that form a system of tubes extending from the roots to the leaves in the phloem of plants; lose their nuclei and organelles at maturity, but retain a functional plasma ...