noun
definition
Any of a group of minute unicellular algae having a siliceous covering of great delicacy, now categorized as class Diatomophyceae or division Bacillariophyta.
Examples of diatom in a Sentence
A multi basin study will be carried out using diatom, pigment and pollen analysis.
Diatom ooze is the characteristic deposit in high southern latitudes.
The largest diatom on the picture measures about 200 microns in diameter.
The dots which are fine markings on the diatom frustule are now clearly seen.
Diatom ooze was recognized by Sir John Murray as the characteristic deposit in high latitudes in the Indian Ocean, and later it was found to be characteristic also of the corresponding parts of the Indian and Pacific covering a total area of about 22,000,000 sq.
Prior to the onset of the 19 th Century, diatom assemblages suggest a little or no change in water acidity.
Despite the generally calcareous environment, it is also possible that the samples contain pollen and diatom evidence.
Research projects typically involve interdisciplinary teams where we provide expertise in diatom analysis or the use of isotope ratios in diatom analysis or the use of isotope ratios in diatoms.
Hexagonal areoles giving a honeycomb effect can be seen in the three-sided diatom Triceratium favus.
The eupelagic deposits are subdivided by Kriimmel into two main groups; (a) epilophic,' including the pteropod, globigerina and diatom oozes occurring on the rises and ridges and in the less deep troughs.
To this inconceivably slowly-growing deposit of inorganic material over the ocean floor there is added an overwhelmingly more rapid contribution of the remains of calcareous and siliceous planktonic and benthonic organisms, which tend to bury the slower accumulating material under a blanket of globigerina, pteropod, diatom or radiolarian ooze.
Diatom ooze has been found in detached areas between the Philippine and Mariana islands, and near the Aleutian and Galapagos groups, forming an exception to the general rule of its occurrence only in high latitudes.
The silica, in the form of diatom or radiolarian skeletons, is eventually deposited on the ocean floor after the death of the organisms. Most of the fine colloidal clay is, however, deposited as river-sludges when the fresh water carrying it mixes with denser sea-water.
The irrigation of the claires is entirely under control, and the claires undergo a special preparation for the production of the green oysters, whose colour seems to be derived from a species of Diatom which abounds in the claires.