tom bolo
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from other ciliates by the possession of a vase-like skeleton or lorica, which
sometimes consists of particles collected from the surrounding water and
cemented together, as, e.g., coccoliths. They may form an important link in the
food-chain between pico- and nanoplankton. ~Ciliophora.
tombolo sand bar connecting an island with the mainland.
topographic wave ~trapped wave.
tortuosity structural characteristic of a sediment that describes the curvature of
the pore space. The tortuosity (q) of a sediment is defined as the ratio of the
actual distance (/a) a solute or water parcel must travel between two locations and the length (/) of a line connecting those locations: q=lall. Some
authors, however, define tortuosity as the squared ratio, (/all)2.
total allowable catch (TAC) the maximum catch allowed of a specific unit stock
during a particular time period. In the European Union, the TAC is split in
national shares, which are called quota.
toxic acting as, or having the effect of, a poison or toxin.
toxicity the quality, relative degree or specific degree, of being toxic or poisonous. Acute toxicity: the consequences of "high" doses of a toxin within a short
time. As a quantitative measure the LDso (lethal dose) or LC so (lethal concentration) is used: the calculated dose or concentration causing 50 % mortality in an experimental population. Semi-chronic toxicity: the effect of generally low or sublethal concentrations of a toxin during an exposure time of
about 10 % of the life time of an experimental organism. Chronic toxicity:
the consequences of sublethal concentrations of a toxin to physiological
mechanisms in organisms exposed during their complete life cycle (or 80 to
90 % of it).
toxic organisms ~venomous marine organisms.
toxin any of a group of poisonous, usually unstable, compounds generated by
microorganisms, plants, animals, or of anthropogenic origin (e.g., industrially synthesized).
trace elements chemical elements occurring in seawater in concentrations typically below the micromolar level. Virtually all metals, largely the transition
metals, occur at such nanomolar to picomolar trace levels. Some, such as Fe,
Mn, Cu, Zn, Mo, V and Co, are micronutrients which occur in sufficient abundance for algal growth in the sea.
324
from other ciliates by the possession of a vase-like skeleton or lorica, which
sometimes consists of particles collected from the surrounding water and
cemented together, as, e.g., coccoliths. They may form an important link in the
food-chain between pico- and nanoplankton. ~Ciliophora.
tombolo sand bar connecting an island with the mainland.
topographic wave ~trapped wave.
tortuosity structural characteristic of a sediment that describes the curvature of
the pore space. The tortuosity (q) of a sediment is defined as the ratio of the
actual distance (/a) a solute or water parcel must travel between two locations and the length (/) of a line connecting those locations: q=lall. Some
authors, however, define tortuosity as the squared ratio, (/all)2.
total allowable catch (TAC) the maximum catch allowed of a specific unit stock
during a particular time period. In the European Union, the TAC is split in
national shares, which are called quota.
toxic acting as, or having the effect of, a poison or toxin.
toxicity the quality, relative degree or specific degree, of being toxic or poisonous. Acute toxicity: the consequences of "high" doses of a toxin within a short
time. As a quantitative measure the LDso (lethal dose) or LC so (lethal concentration) is used: the calculated dose or concentration causing 50 % mortality in an experimental population. Semi-chronic toxicity: the effect of generally low or sublethal concentrations of a toxin during an exposure time of
about 10 % of the life time of an experimental organism. Chronic toxicity:
the consequences of sublethal concentrations of a toxin to physiological
mechanisms in organisms exposed during their complete life cycle (or 80 to
90 % of it).
toxic organisms ~venomous marine organisms.
toxin any of a group of poisonous, usually unstable, compounds generated by
microorganisms, plants, animals, or of anthropogenic origin (e.g., industrially synthesized).
trace elements chemical elements occurring in seawater in concentrations typically below the micromolar level. Virtually all metals, largely the transition
metals, occur at such nanomolar to picomolar trace levels. Some, such as Fe,
Mn, Cu, Zn, Mo, V and Co, are micronutrients which occur in sufficient abundance for algal growth in the sea.