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Mastigophora
mariculture ~aquaculture.
marine provinces ~biogeography.
marine snow the flocs of suspended particles in the ocean, ~f1occulation.
marine terrace ~terrace, marine.
marsh ~salt marsh.
mass extinction ~mass mortality.
mass mortality catastrophic dying of one or several species of organisms (usually not all species are affected) in a limited area. Mass mortality in the sea
often coincides chiefly with red tides and is then due to blooms of poisonous
algae (often Dinoflagellata). However, not all red tides coincide with mass mortalities and other causes of mass mortalities in sea are known, such as volcanism, earth- and seaquakes, sudden changes in salinity or temperature.
Mass extinctions are large mass mortalities that occurred in the past, and
worked over longer periods during which numerous species are exterminated, e.g., at the Cretaceous-Tertiary boundary, which marks the extinction of,
e.g., dinosaurs and ammonites. On the causes of such mass extinctions we can
only speculate, but usually worldwide extra-terrestrial causes are suggested.
The current extinction of many organisms due to activities of man is probably the largest mass mortality ever. ~extinction and ~biohorizon.
mass spectrometry an analytical technique for the identification and quantification of unknown compounds. It is based on the determination of the mass/
charge ratios of ionized molecules and ionized fragments of these molecules. The molecules are fragmentized and ionized by exposure to an excess
of energy. The ionized molecules and fragments are then accelerated and fed
into an ion-analysis device. Here the ions are separated according to their
mass/charge ratios and detected by a spectrum recording system. The
recorded fragmentation pattern contains specific and characteristic information on the molecule structure. Mass spectrometers are often combined
with other analytical instruments (~gas chromatography). The combination of
gas chromatograph, mass spectrometer, and data system is one of the most
powerful analytical devices for the analysis of complex mixtures of
unknown compounds.
Mastigophora (syn. Flagellata, flagellates) unicellular organisms distinguished by
the presence of one or more flagella. Within the zoological classificaton this
group was and is listed as a subphylum of the phylum Sarcomastigophora
(~Protozoa). There are different autotrophic groups, together called the Phy-
Mastigophora
mariculture ~aquaculture.
marine provinces ~biogeography.
marine snow the flocs of suspended particles in the ocean, ~f1occulation.
marine terrace ~terrace, marine.
marsh ~salt marsh.
mass extinction ~mass mortality.
mass mortality catastrophic dying of one or several species of organisms (usually not all species are affected) in a limited area. Mass mortality in the sea
often coincides chiefly with red tides and is then due to blooms of poisonous
algae (often Dinoflagellata). However, not all red tides coincide with mass mortalities and other causes of mass mortalities in sea are known, such as volcanism, earth- and seaquakes, sudden changes in salinity or temperature.
Mass extinctions are large mass mortalities that occurred in the past, and
worked over longer periods during which numerous species are exterminated, e.g., at the Cretaceous-Tertiary boundary, which marks the extinction of,
e.g., dinosaurs and ammonites. On the causes of such mass extinctions we can
only speculate, but usually worldwide extra-terrestrial causes are suggested.
The current extinction of many organisms due to activities of man is probably the largest mass mortality ever. ~extinction and ~biohorizon.
mass spectrometry an analytical technique for the identification and quantification of unknown compounds. It is based on the determination of the mass/
charge ratios of ionized molecules and ionized fragments of these molecules. The molecules are fragmentized and ionized by exposure to an excess
of energy. The ionized molecules and fragments are then accelerated and fed
into an ion-analysis device. Here the ions are separated according to their
mass/charge ratios and detected by a spectrum recording system. The
recorded fragmentation pattern contains specific and characteristic information on the molecule structure. Mass spectrometers are often combined
with other analytical instruments (~gas chromatography). The combination of
gas chromatograph, mass spectrometer, and data system is one of the most
powerful analytical devices for the analysis of complex mixtures of
unknown compounds.
Mastigophora (syn. Flagellata, flagellates) unicellular organisms distinguished by
the presence of one or more flagella. Within the zoological classificaton this
group was and is listed as a subphylum of the phylum Sarcomastigophora
(~Protozoa). There are different autotrophic groups, together called the Phy-