Diatoms
Diatoms
Diatoms (/ˈdaɪ.ətɑːmz/; from Greek διά, dia "through" + τέμνειν, temnein "to cut") are a major group of algae, and are among the most common types of phytoplankton. They are unicellular and can be found in almost every aquatic environment, including fresh and salt water, soil, and as symbionts in other organisms.
Etymology
The term "diatom" is derived from the Greek words "dia" meaning "through" and "temnein" meaning "to cut". This refers to the diatom's unique cell wall, which is composed of two halves that fit together like a box and lid.
Characteristics
Diatoms are known for their unique cell walls or frustules made of silica. These frustules have intricate and beautiful patterns and are resistant to decay. Diatoms exist in a variety of shapes and sizes, with some species being solitary and others forming colonies.
Life Cycle
The life cycle of diatoms involves both asexual and sexual reproduction. The asexual phase is characterized by cell division, while the sexual phase involves the fusion of two gametes.
Ecological Role
Diatoms play a crucial role in the ecosystem. They are primary producers, converting sunlight into energy through photosynthesis and providing a food source for various aquatic organisms. Additionally, they contribute significantly to global carbon cycling and are used as bioindicators to monitor environmental conditions.
Related Terms
External links
- Medical encyclopedia article on Diatoms
- Wikipedia's article - Diatoms
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