| abstract |
Without the use of pump and control unit, etc., a substance needed for microbial action is fed to thereby realize controlling of the activity thereof. Microbial activity controlling substance (3) is charged into container (4) of hermetically sealed structure having nonporous membrane (2) provided at at least part thereof, and the microbial activity controlling substance (3) is fed around the container (4) through the region of nonporous membrane (2) of the container (4) at a rate governed by the molecular permeation performance of the nonporous membrane (2) to thereby control the microbial activity around the container. The microbial activity controlling substance (3) consists of at least one member selected from among microbial energy source providing substance functioning as an electron donor, acidic substance, basic substance, inorganic salts, oxygen releasing substance and oxygen absorbing substance, with the proviso that acidic substance/basic substance and oxygen releasing substance/oxygen absorbing substance combinations are excluded. |