COELASTRUM BAINHA GELATINOSA
....(1) ....(2) Cyanobacteria live in water and they can prepare their own food by photosynthesis. They are the oldest, largest and most important bacteria on the earth. e.g.
(2)Oscillatoria ...SÓ 3 GÉNEROS MONOESPECÍFICOS
ENDOSIMBIONTE EM ASCÍDEAS
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(Image source: http://www.ucmp.berkeley.edu/protista/rhodophyta.html) The red algae look red due to presence of pigment phycoerythrin. These pigments reflect red light and absorb blue light , which penetrates deep into the sea. Some red algae have very little of phycoerythrin so they look blue or greenish due to chlorophyll of some other pigments.
In Asia, Rhodophyta are important source of food. They are rich in Vitamins and protein contents, e.g. nori. They are easy to grow so Japan started growing them more then 300 years ago. Some red algae help in reef-building.
any species of planktonic cyanobacteria possess specialized intracellular gas vesicles. Stacks of these minute (<300 nm) proteinaceous hollow cylinders maintain a gas-filled space in the cell, which enables the organism to regulate its buoyancy and thus to actively seek water depths with optimal growth conditions. However, regulation of buoyancy by changing the amount of gas in the vesicles is slow. Cells adapted to turbulent mixing by enlarged gas vesicles will take a few days to reduce their buoyancy in order to adapt to more quiescent conditions.