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GLOSSARY
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Ecosystem

The totality of flora, fauna, and physical/chemical environment of a locale such as a rainforest or desert.

Ecozoic

One of the proposed names for the emerging period following the present Cenozoic era, to be distinguished by mutually enhancing human-Earth relations.

Ediacarian

A term for the Precambrian age of primitive bacteria, taken from a region of Australia where such traces were found.

Emergence

The resultant appearance of a higher degree of organization in a complex system due to multiple interactions between simpler elements or entities.

Encephalization

The steady, graphically-linear development of larger, more capable brains in evolution.

Entropy

A measure of randomness or disorder in a system associated with energy or heat loss. A term associated with the second law of thermodynamics.

Enzyme

A protein catalyst that promotes and regulates biochemical reactions in cells.

Epigenesis

The developmental course of an organism due to factors other than molecular genetic effects such as topological constraints or environmental influences.

Epigenome

The epigenome is composed of two modules, a component that is part of the covalent structure of DNA, methylated cytosines located in the dinucleotide sequence CG and a noncovalent module. In contrast to genes themselves, the epigenome programs their expression profiles.

Ergodic

A collection of systems forms an ergodic ensemble if the modes of behavior found in any one system resemble its behavior at other time periods and if the behavior of another, randomly chosen, system also is like the standard.

Eukaryotic

A designation for a cell which contains a distinct nucleus with genetic material.