What is pH. pH is a measure of the hydorgen ion concentration of a solution. Solutions with a high concentration of hydrogen ions have a low pH and solutions with a low concentrations of H+ ions have a high pH. This may seem like a confusion way to express these reationships, and it is, until you understand what pH stands for.
Because they depend on sunlight for photosynthesis, diatoms generally live in the upper 200 meters of oceans and bodies of fresh water. Some species of diatoms simply float in the water currents near the surface.Others attach themselves to larger floating objects or to the sea floor.ecause they depend on sunlight for photosynthesis, diatoms generally live in the upper 200 meters of oceans and bodies of fresh water. Some species of diatoms simply float in the water currents near the surface.
Similar to many other algae, they can live as unicellular organisms, colonial, or filamentous. Unlike most algae, though, they have a solid shells made of silica. Because of such shells, diatoms have major economic importance in industry while also having a major role in biological and chemical processes.Almost all of the extant and extinct species of Bacillariophyta are aquatic.ll diatom skeletons are made of silica and consist of two parts or frustules that fit inside each other like a petri dish: the epitheca and the hypotheca (Alexopoulos, 1967). The hypotheca is smaller and fits inside the larger epitheca.