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Acquired Immune Deficiency Syndrome

Acquired Immune Deficiency Syndrome   Reference library

Encyclopedia of Evolution

Reference type:
Subject Reference
Current Version:
2005
Subject:
Science and technology, Life Sciences, Social sciences, Anthropology
Length:
6,732 words
Illustration(s):
2

This entry comprises two articles. The introductory article provides a discussion of the origins and phylogeny of HIV; the companion

affinity index

affinity index   Quick reference

A Dictionary of Ecology (5 ed.)

Reference type:
Subject Reference
Current Version:
2015
Subject:
Science and technology, Life Sciences, Social sciences, Environment
Length:
74 words
Illustration(s):
2

A measure of the relative similarity in composition of two samples. For example, A= c a+b, where ...

age structure

age structure   Quick reference

A Dictionary of Ecology (5 ed.)

Reference type:
Subject Reference
Current Version:
2015
Subject:
Science and technology, Life Sciences, Social sciences, Environment
Length:
60 words
Illustration(s):
1
Within a *population, the number or proportion of individuals in each age group (e.g. in a human population, the number of individuals aged 0–4, 5–14, 15–29, 30–44, 45–59, 60–69, over 70). ... More
Agriculture

Agriculture   Reference library

Encyclopedia of Evolution

Reference type:
Subject Reference
Current Version:
2005
Subject:
Science and technology, Life Sciences, Social sciences, Anthropology
Length:
6,017 words
Illustration(s):
1

This entry comprises two articles. The first article provides an account of the times and places of earliest centers of

aklé

aklé   Quick reference

A Dictionary of Ecology (5 ed.)

Reference type:
Subject Reference
Current Version:
2015
Subject:
Science and technology, Life Sciences, Social sciences, Environment
Length:
66 words
Illustration(s):
1
A French name for a network of sand *dunes that is found especially in the western Sahara. The basic unit of the network is a sinuous ridge, at right angles to the wind, made up of ... More
alfisols

alfisols   Quick reference

A Dictionary of Ecology (5 ed.)

Reference type:
Subject Reference
Current Version:
2015
Subject:
Science and technology, Life Sciences, Social sciences, Environment
Length:
67 words
Illustration(s):
1

Mineral soils that are grouped as an order. These soils have *clay-enriched *argic horizons, are alkaline to intermediate in reaction, with the ...

Amphibians

Amphibians   Reference library

Encyclopedia of Evolution

Reference type:
Subject Reference
Current Version:
2005
Subject:
Science and technology, Life Sciences, Social sciences, Anthropology
Length:
4,277 words
Illustration(s):
4

Amphibians are named for their two-phased life consisting of larva and adult. Typically the larva is aquatic and metamorphoses into

aneroid barometer

aneroid barometer   Quick reference

A Dictionary of Ecology (5 ed.)

Reference type:
Subject Reference
Current Version:
2015
Subject:
Science and technology, Life Sciences, Social sciences, Environment
Length:
56 words
Illustration(s):
1
An instrument for measuring atmospheric pressure as represented by the height (or thickness) of a sealed, flexible, metal, concertina-shaped drum from which air has been partially ... More
Animals

Animals   Reference library

Encyclopedia of Evolution

Reference type:
Subject Reference
Current Version:
2005
Subject:
Science and technology, Life Sciences, Social sciences, Anthropology
Length:
4,082 words
Illustration(s):
3

The Metazoa (equals animals) is one of the great kingdoms of life. Estimates of the current numbers of living animal

Antibiotic Resistance

Antibiotic Resistance   Reference library

Encyclopedia of Evolution

Reference type:
Subject Reference
Current Version:
2005
Subject:
Science and technology, Life Sciences, Social sciences, Anthropology
Length:
8,300 words
Illustration(s):
1

This entry comprises three articles:

The first article

Apoptosis

Apoptosis   Reference library

Encyclopedia of Evolution

Reference type:
Subject Reference
Current Version:
2005
Subject:
Science and technology, Life Sciences, Social sciences, Anthropology
Length:
2,330 words
Illustration(s):
2

Apoptosis, programmed or physiological cell death, is an active self-killing process of cells that regulates cell number and tissue architecture,

aquifer

aquifer   Quick reference

A Dictionary of Ecology (5 ed.)

Reference type:
Subject Reference
Current Version:
2015
Subject:
Science and technology, Life Sciences, Social sciences, Environment
Length:
82 words
Illustration(s):
1
A body of permeable rock (e.g. unconsolidated gravel or a *sand stratum) that is capable of storing significant quantities of water, that is underlain by impermeable material, and through ... More
area cladistics

area cladistics   Quick reference

A Dictionary of Ecology (5 ed.)

Reference type:
Subject Reference
Current Version:
2015
Subject:
Science and technology, Life Sciences, Social sciences, Environment
Length:
84 words
Illustration(s):
1
A technique that employs relationships between organisms to reconstruct past distributions and the positions of continents, independently of geological data. Genetic and morphological ... More
areagram

areagram   Quick reference

A Dictionary of Ecology (5 ed.)

Reference type:
Subject Reference
Current Version:
2015
Subject:
Science and technology, Life Sciences, Social sciences, Environment
Length:
63 words
Illustration(s):
1
A diagram derived from a *cladogram but with the addition of data referring to the former geographic distribution of organisms. The areagram resembles a cladogram, but instead of showing ... More
aridisols

aridisols   Quick reference

A Dictionary of Ecology (5 ed.)

Reference type:
Subject Reference
Current Version:
2015
Subject:
Science and technology, Life Sciences, Social sciences, Environment
Length:
62 words
Illustration(s):
1

An order of *mineral soils found in arid environments. These soils have very little organic matter in their surface ...

Art

Art   Reference library

Encyclopedia of Evolution

Reference type:
Subject Reference
Current Version:
2005
Subject:
Science and technology, Life Sciences, Social sciences, Anthropology
Length:
4,903 words
Illustration(s):
2

This entry comprises two articles. The introductory article is a wide-ranging overview of art in human prehistory that discusses its

artesian well

artesian well   Quick reference

A Dictionary of Ecology (5 ed.)

Reference type:
Subject Reference
Current Version:
2015
Subject:
Science and technology, Life Sciences, Social sciences, Environment
Length:
112 words
Illustration(s):
1
A well that flows at the surface without pumping, because it is sunk into a confined *aquifer with a hydraulic head (sometimes called the potentiometric or piezometric head) that lies ... More
Artificial Selection

Artificial Selection   Reference library

Encyclopedia of Evolution

Reference type:
Subject Reference
Current Version:
2005
Subject:
Science and technology, Life Sciences, Social sciences, Anthropology
Length:
3,500 words
Illustration(s):
2

The term “artificial selection” is generally applied to situations in which humans deliberately mold the features of another species by

auger

auger   Quick reference

A Dictionary of Ecology (5 ed.)

Reference type:
Subject Reference
Current Version:
2015
Subject:
Science and technology, Life Sciences, Social sciences, Environment
Length:
61 words
Illustration(s):
1
A tool used primarily for soil sampling, but also for sampling peats and other unconsolidated sediments. The simplest and most universal form has a screw head to bore the soil or sediment. ... More
Bacteria and Archaea

Bacteria and Archaea   Reference library

Encyclopedia of Evolution

Reference type:
Subject Reference
Current Version:
2005
Subject:
Science and technology, Life Sciences, Social sciences, Anthropology
Length:
3,133 words
Illustration(s):
2

Although they are generally much smaller than can be distinguished by the human eye, microbes are almost everywhere: from rocks

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