PROBLEM TO BE SOLVED: To solve problems that: in many of conventional culture tanks of photosynthetic microbes and plant cells which use light as an energy source, irradiation of sunlight dose not fully reach a culture suspension in the depth of the tank, and therefore, growth yield remains low and moreover, for a cylindrical culture tank, a loading space increases.SOLUTION: The light, which enters from a side surface and an upper part of a culture tank, is transmitted by a structure, which extends from an inner surface of a side wall of the culture tank toward a central part of the tank or the opposite side walls in a height which exceeds the surface of the culture suspension from a bottom part of the tank, and more light is irradiated to the culture suspension in the depth of the tank by emitting the light into the culture suspension in the process of transmission. The culture density, which makes the growth yield as high as possible relative to variable irradiation intensity of sunlight, is identified, and the culture density is adjusted to the value. A housing of the cylindrical culture tank which has the feature is divided into two to be manufactured and transported.COPYRIGHT: (C)2014,JPO&INPIT【課題】従来の光をエネルギー源とする光合成微生物や植物細胞の培養槽の多くは太陽光の照射が槽内の深部の培養懸濁液迄十分に届かず、低い増殖量に留まっている。また円筒型の培養槽は積載スペースが嵩む。【解決手段】培養槽の側壁の内側の面から槽の中心部或いは対向する側壁に向って槽の底部から培養懸濁液の液面を越える高さで延展する構造体で槽の側面及び上部より入射する光を伝送し、且つ伝送の過程で培養懸濁液中に出光することにより槽内深部の培養懸濁液迄より多くの光を照射する。太陽光の変動する照射強度に対し、増殖量をできる限り高くする培養密度を特定し、その値に培養密度を調節する。上記の特徴を有する円筒型培養槽の筺体を2分割して製作し運送する。【選択図】図1
