Abstract: A tidal power generation apparatus includes a first group of containers fixed in plural piles in a natural sea having a tidal difference in sea level height, which containers are spaced in parallel to one another at fixed intervals, each container of which is opened at a lower side thereof and is capable of holding air therein, a second group of containers fixed in plural piles in tideless water within an artificial dam, which second group of containers are spaced parallel to one another at fixed intervals, each container of which is opened at a lower side thereof and is capable of holding air therein, and air pipes providing communication between respective containers of the first group in the natural sea and respective containers of the second group within the artificial dam. With the apparatus, the energy in a tide is collected in the form of energy in compressed air created by water pressure at high tide.

Abstract: An apparatus for the continuous perfusion of a liquid in cell culture, hydroponic and breeding processes includes a container having a sealed lower portion and an open upper portion, a hollow tube having an upper end in the open upper portion and a lower end in the sealed lower portion of the container for introducing liquid to be perfused into the sealed lower portion, a blast pipe for introducing perfusing gas into the sealed lower portion of the container, and a hollow U-shaped pipe extending from above the sealed lower portion of the container and thereinto. The relative positioning of the ends of the hollow tube and hollow pipe at a particular height differential provides for a piston like movement of air and liquid to perfuse the liquid without requiring any electricity or motors.