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gas chromatography
G
gabbro (syn. diorite) a coarse-grained igneous rock, consisting in large part of
plagioclase feldspar and ferromagnesian silicates. Gabbro is the intrusive
equivalent of the fine-graines basalt. ~ volcanism and ~Iayer 1, layer 2, etc.
Gaia name of the Greek goddess of Earth. For Gaia hypothesis ~holistic approach.
Galathea Expedition (1950-1952) this Danish round-the-world deep-sea expedition studied in particular the deep-sea (hadal) fauna under Anton Bruun as
scientific leader, but also for the first time primary production measurements were carried out all around the world using 14C by E. Steemann
Nielsen the inventor of this method (~14C-method, productivity measurement).
The discovery of Neopilina, a representative of the monoplacophora, a group
of Mollusca up to then only known as fossils, made this expedition famous.
Gammaridea (gammarids) subclass of Amphipoda.
ganglion small mass of nervous tissue containing numerous neurons (i.e., nerve
cell bodies). The nervous system of many invertebrates consists largely of
such ganglia, connected by nerve cords, variously arranged but usually welldeveloped in the head (cerebral ganglia). In vertebrates ganglia also occur in
the peripheral and autonomous nervous system.
gas bladder (swim- or air bladder, air sac), organ in fish of which the original function was probably a respiratory one evolved into a hydrostatic organ. By
adjusting the gas content (air or gas secreted in its lining) specific gravity of
the animal is changed, and with that the buoyancy.
gas chromatography an analytical technique based on the partitioning of a
solute into a mobile gas phase and a stationary liquid phase. The stationary
phase is coated on the inner wall of a column or on the surface of a carrier.
Solute sample and mobile phase are introduced into the entrance of the
column. The exit of the column is connected to a detection system.
Partitioning of the solute between the mobile and the stationary phase is
determined by the temperature, the chemical/physical properties of the
solute and the liquid phase. Volatile compounds with low affinity for the
stationary phase will leave the column first. The technique is commonly
used for the separation of complex mixtures, such as organochlorines, into
their constituents.
gas chromatography
G
gabbro (syn. diorite) a coarse-grained igneous rock, consisting in large part of
plagioclase feldspar and ferromagnesian silicates. Gabbro is the intrusive
equivalent of the fine-graines basalt. ~ volcanism and ~Iayer 1, layer 2, etc.
Gaia name of the Greek goddess of Earth. For Gaia hypothesis ~holistic approach.
Galathea Expedition (1950-1952) this Danish round-the-world deep-sea expedition studied in particular the deep-sea (hadal) fauna under Anton Bruun as
scientific leader, but also for the first time primary production measurements were carried out all around the world using 14C by E. Steemann
Nielsen the inventor of this method (~14C-method, productivity measurement).
The discovery of Neopilina, a representative of the monoplacophora, a group
of Mollusca up to then only known as fossils, made this expedition famous.
Gammaridea (gammarids) subclass of Amphipoda.
ganglion small mass of nervous tissue containing numerous neurons (i.e., nerve
cell bodies). The nervous system of many invertebrates consists largely of
such ganglia, connected by nerve cords, variously arranged but usually welldeveloped in the head (cerebral ganglia). In vertebrates ganglia also occur in
the peripheral and autonomous nervous system.
gas bladder (swim- or air bladder, air sac), organ in fish of which the original function was probably a respiratory one evolved into a hydrostatic organ. By
adjusting the gas content (air or gas secreted in its lining) specific gravity of
the animal is changed, and with that the buoyancy.
gas chromatography an analytical technique based on the partitioning of a
solute into a mobile gas phase and a stationary liquid phase. The stationary
phase is coated on the inner wall of a column or on the surface of a carrier.
Solute sample and mobile phase are introduced into the entrance of the
column. The exit of the column is connected to a detection system.
Partitioning of the solute between the mobile and the stationary phase is
determined by the temperature, the chemical/physical properties of the
solute and the liquid phase. Volatile compounds with low affinity for the
stationary phase will leave the column first. The technique is commonly
used for the separation of complex mixtures, such as organochlorines, into
their constituents.