11
analysis (chemical)
amphidromic point ~co-tidallines.
Amphineura former class of the phylum Mollusca, now divided into the classes
Polyplacophora and Aplacophora.
Amphipoda (amphipods) order of class Malacostraca, subphylum Crustacea (phylum
Arthropoda). Large order (100 families) of small and mainly marine, but also
freshwater crustaceans. There is no carapace, only one or two segments are
fused to the head. The abdomen is not distinctly demarcated from the thorax,
and the thorax has seven pairs of legs, of which the first two pairs are usually
nipperlike (subchelate). They resemble the Isopod a, but the body is usually laterally compressed. The compound eyes are sessile. Example: gammarids.
Amphipoda
anabolism ~metabolism .
anadromous (upward-running) term used for marine fish that migrate from the
sea to freshwater for their reproduction, e.g., the salmon; opposite of catadromous.
anaerobic in absence of free oxygen, opposite to aerobic. For example: anaerobic
organisms do not require free oxygen for their metabolic processes; anaerobic processes can be carried out in the absence of free oxygen; in anaerobic respiration an electron acceptor other than oxygen is used in the electron-type transport oxidation system. This type of respiration occurs in
some groups of bacteria. The most common anaerobic electron acceptors
are nitrate, sulfate, and carbonate, which are eventually metabolized into
ammonia, H 2 S, and methane, respectively; the anaerobic zone is the zone in
the sea bottom without free oxygen, ~benthic system.
analysis (chemical) determination of chemical constituents by various techniques. In the marine environment, a great number of these techniques have
to be adapted due to the excess of sodium chloride in seawater relative to all
other major and minor constituents. Marine chemical analyses are used in
physical oceanographic research, marine chemistry itself, and marine biol-
analysis (chemical)
amphidromic point ~co-tidallines.
Amphineura former class of the phylum Mollusca, now divided into the classes
Polyplacophora and Aplacophora.
Amphipoda (amphipods) order of class Malacostraca, subphylum Crustacea (phylum
Arthropoda). Large order (100 families) of small and mainly marine, but also
freshwater crustaceans. There is no carapace, only one or two segments are
fused to the head. The abdomen is not distinctly demarcated from the thorax,
and the thorax has seven pairs of legs, of which the first two pairs are usually
nipperlike (subchelate). They resemble the Isopod a, but the body is usually laterally compressed. The compound eyes are sessile. Example: gammarids.
Amphipoda
anabolism ~metabolism .
anadromous (upward-running) term used for marine fish that migrate from the
sea to freshwater for their reproduction, e.g., the salmon; opposite of catadromous.
anaerobic in absence of free oxygen, opposite to aerobic. For example: anaerobic
organisms do not require free oxygen for their metabolic processes; anaerobic processes can be carried out in the absence of free oxygen; in anaerobic respiration an electron acceptor other than oxygen is used in the electron-type transport oxidation system. This type of respiration occurs in
some groups of bacteria. The most common anaerobic electron acceptors
are nitrate, sulfate, and carbonate, which are eventually metabolized into
ammonia, H 2 S, and methane, respectively; the anaerobic zone is the zone in
the sea bottom without free oxygen, ~benthic system.
analysis (chemical) determination of chemical constituents by various techniques. In the marine environment, a great number of these techniques have
to be adapted due to the excess of sodium chloride in seawater relative to all
other major and minor constituents. Marine chemical analyses are used in
physical oceanographic research, marine chemistry itself, and marine biol-