Morphological characteristics


Multicellular algae, cylindrical spiral filaments, solitary or clustered, algal filaments 5-10 μm in diameter, apex blunt, 2-7 helices. The algae can vibrate and rotate, often rotating like a vertical axis and crawling forward. The cell contents are uniform and there is no real nuclei. The algal body is a non-branched filament composed of a single line of cells, and the colloidal sheath has no or only a very thin sheath and has a regular spiral shape to form an algal colony. No abnormal cells and posterior wall spores. Due to the different amounts of phycoerythrin and phycocyanin in the body, different body colors, such as blue-green, yellow-green or purple-red, are present. And there is a slim cross-wall. It is a simple breeding method of prokaryotes that can be directly split.




Spirulina


  Distribution


It grows in a variety of fresh water and seawater, and often floats in medium or low tide seawater or epiphytic on other algae and attachments to form a turquoise coating. The world's four natural lakes that naturally grow spirulina, Tchad Lake in Africa, Texcoco Lake in Mexico, Chenghai Lake in Lijiang, Yunnan, China, and Hamaseta Lake in Ordos. It has been artificially cultivated and produced in large areas. [3]


Growing environment


The optimal growth temperature of spirulina is 35-37 ° C, which has good heat resistance. The optimal growth pH range is 3-11.0, which is not conducive to growth when the pH is above 11.0. In the case of normal nutrition and temperature, light becomes an important factor affecting the growth of spirulina. In outdoor culture, the light source is mainly the sun. In the experiment, the cool white light source is generally used, and the light intensity required for growth and culture is about 3700- 4000lx, about 1100lx when maintained. The growth of spirulina is not only affected by the light intensity, but also because of the different color values of light.