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Glossary: Bacillus

February 15th, 2012 — 2:18pm

Genus of Gram-positive, mostly rod-shaped, bacteria including both free-living and pathogenic species.

Glossary: backwater

February 15th, 2012 — 2:18pm

Quiet, often stagnant body of water connected to a larger body but held back in some way, e.g. by a naturally-occurring dam or tide.

Glossary: bacteria

February 15th, 2012 — 2:18pm

Large group of prokaryotic microorganisms representing one of the three domains of living organisms. Present in the majority of Earth's habitats as well as organic matter and the bodies of live animals. Most are harmless, some beneficial and others pathogenic.

Glossary: bactericide

February 15th, 2012 — 2:18pm

An agent with the ability to destroy bacteria.

Glossary: ball valve

February 24th, 2012 — 11:11am

Type of shutoff valve comprising a free-floating ball with a cylindrical-shaped hole in it that sits in a concave-shaped depression over an opening.

Glossary: bar

February 15th, 2012 — 2:18pm

Used in ichthyology to describe a vertical or diagonal marking, normally with well-defined margins, often located on the flank of a fish.

Glossary: barb

February 15th, 2012 — 2:18pm

In zoology, used to refer to a small spine projecting from a larger one; alternative name for spinule and, sometimes, barbel. Also used to refer to cyprinid fishes of the genera Barbus, Puntius, Systomus and related species.

Glossary: barbel

February 15th, 2012 — 2:18pm

A slender, whiskerlike, external process on the jaw or other part of the head of certain fishes used for touch and taste. Also used to refer to European members of the cyprinid genus Barbus.

Glossary: basal

February 15th, 2012 — 2:18pm

At, towards or constituting a base; primitive. Opposite of derived. In cladistics, used to in reference to a clade within which other clades are nested.

Glossary: base

February 16th, 2012 — 3:54pm

The bottom or lowest part of something. Biology. The point of attachment of a part or organ, e.g., a fin. Chemistry. A substance¬†that can accept protons or donate pairs of electrons. The chemical opposite of an acid. Bases have a pH greater than 7.0 and a solution containing one or more bases is often referred […]

Glossary: basibranchial

February 15th, 2012 — 2:18pm

Of, being, or relating to a median ventral cartilage or bony element located at the ventral point of a branchial arch, behind the tongue if the latter is present.

Glossary: basibranchial teeth

February 15th, 2012 — 2:18pm

Teeth on the median ventral plate (base of the tongue) overlying the basibranchial bones between the gill arches in some fishes.

Glossary: basic

February 16th, 2012 — 3:55pm

Of, relating to, forming, or being a base.

Glossary: basicaudal

February 15th, 2012 — 2:18pm

At or on the base of the caudal fin.

Glossary: basicity

February 15th, 2012 — 2:18pm

Being a base, or the extent to which a substance is basic.

Glossary: basin

February 15th, 2012 — 2:18pm

Used to denote a region drained by a single river system, e.g., the Amazon basin.

Glossary: basipterygium

February 15th, 2012 — 2:18pm

Basal bone or cartilage located at the base of the paired fins in some fishes.

Glossary: batch fecundity

February 15th, 2012 — 2:18pm

The number of eggs released by a serial spawner during a single spawning event.

Glossary: batch spawner

February 15th, 2012 — 2:18pm

A fish species which deposite eggs on more than a single occasion throughout a particular spawning season rather than within a short period.

Glossary: batesian mimicry

February 15th, 2012 — 2:18pm

A form of protective mimicry whereby a harmless species closely resembles an unpalatable or harmful species thus reducing the potential of predation.