4_Diatoms are a major group of typically unicellular algae, and are one of the most common varieties of phytoplankton. Unique to diatoms, their cells are encased in a cell wall of silica (silicon dioxide), which is responsible for their crystalline appearance. Diatoms are autotrophic, meaning they derive their nutrition from their surroundings by means of photosynthesis or chemosynthesis. This places them in the role of producers in the food chain.
Coloured scanning electron micrograph of the surface of the mineralised cell wall of an unidentified diatom
Excel Mouse Mayhem - 35+ Mouse tricks for mouse mongers
double click cell wall selection
Diatoms are a major group of algae, and are among the most common types of phytoplankton. A unique feature of diatom cells is that they are enclosed within a cell wall made of silica (hydrated silicon dioxide) called a frustule. Fossil evidence suggests that they originated during, or before, the early Jurassic period