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A diatom ( Neo-Latin diatoma) [a] is any member of a large group comprising several genera of algae, specifically microalgae, found in the oceans, waterways and soils of the world.
Diatoms are among the most important and prolific microscopic sea organisms and serve directly or indirectly as food for many animals. Diatomaceous earth, a substance composed of fossil diatoms, is used in filters, insulation, abrasives, paints, and varnishes and as a base in dynamite.
- The Editors of Encyclopaedia Britannica
Diatoms, Phylum Bacillariophyta. Diatoms are another photosynthetic lineage of heterokonts that was derived from the secondary endosymbiosis of the red alga. Diatoms are an incredibly diverse group of unicellular organisms containing anywhere from 20,000 to 2 million species.
How big are diatoms? Nearly all diatoms are microscopic - cells range in size from 2 µm to 500 µm (= 0.5 mm). The biggest diatoms are about the width of a human hair. Scientists use light microscopes (LM) or scanning electron microscopes (SEM) to view diatom. When diatoms are viewed with a light...
1 mar 2022 · Diatoms are a major phytoplankton group, playing a critical role in the biogeochemical cycles of chemical elements such as carbon. They are one of the most abundant single-celled photosynthetic algae, contributing to about 40% of total marine primary production.
2 giorni fa · The diatoms are an amazing group of organisms, part of the Stremenopile lineage of life. These photosynthetic unicells (ranging from 1 µm to over 1 mm in size) have chlorophylls a and c, and a complement of accessory pigments that include xanthophylls and carotenoids, making the living cells golden-brown in color.
13 mag 2009 · Marine diatoms rose to prominence about 100 million years ago and today generate most of the organic matter that serves as food for life in the sea.
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