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Specimen 100
Closterium is a genus of unicellular, freshwater algae that are curved in shape and can reach lengths of up to 2 mm. Closterium is characterized by the presence of two star-shaped chloroplasts that are connected by a narrow isthmus. In this video, we zoom in on the ends of the closterium, which are are called polar vacuoles. Inside the vacuoles you can see small, spinning crystals called "gypsum crystals", which are composed of calcium sulphate. The function of these gypsum crystals is not entirely clear, but there are several hypotheses about their possible roles. One hypothesis suggests that gypsum crystals may help to reinforce the cell wall, making it more rigid and resistant to damage. Another hypothesis proposes that the crystals may act as a source of calcium for the cell, which could be important for various cellular processes. Finally, some researchers have suggested that the crystals may play a role in regulating the movement of ions into and out of the cell. Overall, more research is needed to fully understand the function of gypsum crystals in Closterium cells. The spinning movement of these crystals is caused by Brownian motion - the random movement of microscopic particles in a fluid caused by the constant bombardment of the particles by the molecules of the surrounding medium. Closterium is a photosynthetic organism, meaning that it uses sunlight to produce energy through the process of photosynthesis. The two chloroplasts in Closterium allow it to maximize its exposure to sunlight, increasing its photosynthetic efficiency when Closterium is exposed to high levels of light, it can adjust the orientation of its chloroplasts to minimize the amount of light that enters the c |