109
endostyle
elements our natural environment is built up of 90 different chemical elements,
numbers 1 through 92, omitting numbers 43 (Tc or Technetium) and 61 (Pm
or Promethium), of which only man-made, relatively short-lived radioisotopes
now occur in the environment. The transuranic elements 93 through 103, all
in the Actinide series, also are man-made only. All 90 natural elements exist
in seawater in concentrations ranging (when excluding the Hand ° in the
H 2 0 water molecule) from about 0.47 moles per liter for Na (sodium) down
to the femtomolar range (10.15 moles per liter) for trace elements like Eu
(Europium), Pd (Palladium), or Bi (Bismuth).
EI Nino the name given by the inhabitants of the west coast of S. America to the
phenomenon that around Christmas time (hence the name "the child")
warm equatorial water moves southward and replaces the colder waters that
are present there for the rest of the year. It appears that at 3- to 7-year intervals this phenomenon is much more pronounced and gives rise to exceptional climatic conditions. The atmosphere-ocean interaction that is held to
be the reason for this interannual oscillation is part of the so-called Southern
Oscillation. Strong El Nino years upset the ecological conditions along large
parts of the South American coast, with effects on the fisheries.
emigration process of migration of individuals of a population out of an area.
As opposed to immigration, migration towards, into an area.
endobenthos benthic organisms that live in the sediment. ~benthos and
~endofauna.
endoderm the innermost tissue layer of an animal embryo, developing into the
greater part of the gut with its associated glands. All tissues at later stages
derived from this embryonic layer are called endodermal tissues.
endofauna (syn. infauna) organisms that live buried in the sediment for the greater
part of their lives, such as most worms and bivalves. Sampling methods
( ~bottom samplers) for endofauna include cores and grabs, of which the contents
are washed over a sieve in order to remove the sediment; opposite of epifauna.
endoparasites ~parasites.
endospore bacterial spore formed within the cell; it is extremely resistant to
heat as well as to other harmful agents.
endostyle organ for ciliary feeding in, e.g., Urochordata. It consists of a ciliated and
glandular groove or pocket in the ventral wall of the pharynx. It produces
threads of mucus to which food particles adhere that are passed backwards
by ciliary (~cilia) action.
endostyle
elements our natural environment is built up of 90 different chemical elements,
numbers 1 through 92, omitting numbers 43 (Tc or Technetium) and 61 (Pm
or Promethium), of which only man-made, relatively short-lived radioisotopes
now occur in the environment. The transuranic elements 93 through 103, all
in the Actinide series, also are man-made only. All 90 natural elements exist
in seawater in concentrations ranging (when excluding the Hand ° in the
H 2 0 water molecule) from about 0.47 moles per liter for Na (sodium) down
to the femtomolar range (10.15 moles per liter) for trace elements like Eu
(Europium), Pd (Palladium), or Bi (Bismuth).
EI Nino the name given by the inhabitants of the west coast of S. America to the
phenomenon that around Christmas time (hence the name "the child")
warm equatorial water moves southward and replaces the colder waters that
are present there for the rest of the year. It appears that at 3- to 7-year intervals this phenomenon is much more pronounced and gives rise to exceptional climatic conditions. The atmosphere-ocean interaction that is held to
be the reason for this interannual oscillation is part of the so-called Southern
Oscillation. Strong El Nino years upset the ecological conditions along large
parts of the South American coast, with effects on the fisheries.
emigration process of migration of individuals of a population out of an area.
As opposed to immigration, migration towards, into an area.
endobenthos benthic organisms that live in the sediment. ~benthos and
~endofauna.
endoderm the innermost tissue layer of an animal embryo, developing into the
greater part of the gut with its associated glands. All tissues at later stages
derived from this embryonic layer are called endodermal tissues.
endofauna (syn. infauna) organisms that live buried in the sediment for the greater
part of their lives, such as most worms and bivalves. Sampling methods
( ~bottom samplers) for endofauna include cores and grabs, of which the contents
are washed over a sieve in order to remove the sediment; opposite of epifauna.
endoparasites ~parasites.
endospore bacterial spore formed within the cell; it is extremely resistant to
heat as well as to other harmful agents.
endostyle organ for ciliary feeding in, e.g., Urochordata. It consists of a ciliated and
glandular groove or pocket in the ventral wall of the pharynx. It produces
threads of mucus to which food particles adhere that are passed backwards
by ciliary (~cilia) action.