Provided in the present invention is an incubator capable of producing pressure fluctuations. The incubator comprises an incubator body and a variable pressure apparatus, the incubator body having a variable pressure interface, the variable pressure apparatus being connected to the incubator body by means of the variable pressure interface, and the variable pressure apparatus being used for inputting fluctuating or constant air pressure into the incubator body.

A system comprising a collocated thermal plant, water source, CO.sub.2 source and biomass growth module is disclosed. A method of improving the environment by utilizing the system is disclosed.

An industrialized protein production system using carbon-containing industrial gas includes a bacteria preparation system, a raw gas purification system, a water purification system, a bacteria separation system and a protein preparation system, wherein the bacteria preparation system is respectively communicated with the raw gas purification system, the water purification system and the bacteria separation system, and the protein preparation system is communicated with the bacteria separation system. By purifying the raw gas and the raw water and removing impurities from the raw gas and competing bacteria in the raw water, excellent raw materials and environment are provided for bacterial reproduction, which enable the raw gas to have high-efficiency fermentation, thereby increasing the yield of proteins.

A bioreactor for culturing/proliferating cells or acquiring exosomes secreted from the cells includes: a housing in the shape of a container having an inner space which is filled with a predetermined amount of a solution; a support assembly which includes a plurality of supports formed of a plate-shaped member having a predetermined area and spaced apart from each other in one direction, and which is disposed in the inner space to be immersed in the solution; and a gas supply part which includes a main body having a gas storage space filled with gas supplied from the outside, and is disposed in the inner space to supply gas from the gas storage space to the solution, wherein the main body is immersed in the solution filled in the inner space so that the gas stored in the gas storage space can move to the solution and be dissolved.