Abstract: A water treatment system includes a flat plate rotating so as to be partially immersed in a raw water and an imaging device configured to image the flat plate to which microorganisms adhere. The water treatment system further includes a calculator configured to calculate an amount of the microorganisms adhering to the flat plate, a controller configured to control the water treatment system and a lighting device radiating light on the flat plate.

Abstract: A wastewater treatment apparatus includes a treatment mechanism that treats a wastewater containing an organic chromaticity component with an enzyme produced by Bacillus proteolyticus.

Abstract: A water treatment apparatus includes a flat plate and a remover. The flat plate rotates so as to be partially immersed in raw water and to which microorganisms that purify the raw water are attached. The remover removes part of the microorganisms adhering to the flat plate.

Abstract: A printer includes a conveying unit configured to convey a sheet having a detection area on at least a portion of a sheet surface; a sensor configured to output a detection signal in accordance with a surface of the sheet conveyed by the conveying unit; an acquisition unit configured to acquire, at a predetermined interval in accordance with conveyance of the sheet, the detection signal output from the sensor; a detection unit configured to detect the detection area based on an integrated value of a change amount of the detection signal acquired at the predetermined interval by the acquisition unit; and a printing control unit configured to control a printing position for printing on the sheet based on the detection area detected by the detection unit.

Abstract: A printer includes a conveying unit configured to convey a sheet having a detection area on at least a portion of a sheet surface; a sensor configured to output a detection signal in accordance with a surface of the sheet conveyed by the conveying unit; an acquisition unit configured to acquire, at a predetermined interval in accordance with conveyance of the sheet, the detection signal output from the sensor; a detection unit configured to detect the detection area based on an integrated value of a change amount of the detection signal acquired at the predetermined interval by the acquisition unit; and a printing control unit configured to control a printing position for printing on the sheet based on the detection area detected by the detection unit.

Abstract: Disclosed is an apparatus for removing dissolved hydrogen sulfide, including an anaerobic treatment tank (1) that anaerobically treats organic discharged water, a circulation water tank (3), means for introducing organic discharged water into circulation water, a treated-water tank (4) that temporarily stores anaerobically treated water, a biological desulfurization tower (5) that desulfurizes biogas formed by anaerobic treatment, air feeding means for feeding air to the biological desulfurization tower (5), water feeding means for feeding water to the biological desulfurization tower (5), first aerating means (9a) for blowing a part of biologically desulfurized gas from the biological desulfurization tower (5), into the treated-water tank (4), and second aerating means (9b) for blowing exhaust gas discharged from the treated-water tank (4) into a solution circulating between the anaerobic treatment tank (1) and circulation water tank (3).

Abstract: An aeration-less water treatment apparatus including an anaerobic reactor which receives sewage to cause the sewage to flow as an upward stream, and an aerobic reactor which receives treated water from the anaerobic reactor to cause the water to flow as a downward stream so that the water contacts aerobic microorganisms and air to aerobically treat the polluted matter in the water, the apparatus further including a suspended sludge section located in a lower part of the anaerobic reactor and in which the anaerobic microorganisms are suspended in the sewage, and a carrier section located in an upper part of the anaerobic reactor and having carriers to which the anaerobic microorganisms are attached, the anaerobic microorganisms having flowed from the suspended sludge section being further attached to the carriers.

Abstract: Disclosed is a desulfurization apparatus including a biological reaction tank 1 into which a hydrogen sulfide gas-containing gas is introduced, a carrier-packed layer 2a, 2b that is arranged in the biological reaction tank 1 and packed with a carrier for adhesion of microorganisms, a means that feeds an oxygen-containing gas to the biological reaction tank 1, and two or more sprinkling mechanisms 3, 4 that sprinkle water necessary for the organisms on the upper part of the biological reaction tank 1.

Abstract: Disclosed is a biological desulfurization apparatus including a reaction tower 1 into which biogas generated by anaerobic fermentation of organic waste is to be introduced, a carrier-packed layer 2a, 2b arranged in the reaction tower and provided with a carrier to which microorganisms have adhered, an air feeding pipe 3 that mixes air into a lower part of the reaction tower, and a sprinkling mechanism 7 that sprinkles water on an upper part of the reaction tower, wherein the carrier-packed layer is arranged in two or more stages.

Abstract: Disclosed is an apparatus for removing dissolved hydrogen sulfide, including an anaerobic treatment tank (1) that anaerobically treats organic discharged water, a circulation water tank (3), means for introducing organic discharged water into circulation water, a treated-water tank (4) that temporarily stores anaerobically treated water, a biological desulfurization tower (5) that desulfurizes biogas formed by anaerobic treatment, air feeding means for feeding air to the biological desulfurization tower (5), water feeding means for feeding water to the biological desulfurization tower (5), first aerating means (9a) for blowing a part of biologically desulfurized gas from the biological desulfurization tower (5), into the treated-water tank (4), and second aerating means (9b) for blowing exhaust gas discharged from the treated-water tank (4) into a solution circulating between the anaerobic treatment tank (1) and circulation water tank (3).

Abstract: An aeration-less water treatment system includes an anaerobic treatment tank which subjects sewage supplied by a pump to anaerobic treatment by causing the sewage to upflow, and an aerobic treatment tank which subjects anaerobically treated water to aerobic treatment by letting the anaerobically treated water to downflow by natural downflow. The aerobic treatment tank includes an aerobic filter bed section in which carriers to which aerobic microorganisms are adhered are arranged. The aerobic filter bed section subjects the anaerobically treated water to decomposition treatment by putting the anaerobic treatment water in contact with the aerobic microorganisms adhered to surfaces of the carriers. The aerobic filter bed section is provided with an air port which takes in air into under normal pressure, thereby activating the aerobic microorganisms.

Abstract: An aeration-less water treatment apparatus including an anaerobic reactor which receives sewage to cause the sewage to flow as an upward stream, and an aerobic reactor which receives treated water from the anaerobic reactor to cause the water to flow as a downward stream so that the water contacts aerobic microorganisms and air to aerobically treat the polluted matter in the water, the apparatus further including a suspended sludge section located in a lower part of the anaerobic reactor and in which the anaerobic microorganisms are suspended in the sewage, and a carrier section located in an upper part of the anaerobic reactor and having carriers to which the anaerobic microorganisms are attached, the anaerobic microorganisms having flowed from the suspended sludge section being further attached to the carriers.

Abstract: An aeration-less water treatment system includes an anaerobic treatment tank which subjects sewage supplied by a pump to anaerobic treatment by causing the sewage to upflow, and an aerobic treatment tank which subjects anaerobically treated water to aerobic treatment by letting the anaerobically treated water to downflow by natural downflow. The aerobic treatment tank includes an aerobic filter bed section in which carriers to which aerobic microorganisms are adhered are arranged. The aerobic filter bed section subjects the anaerobically treated water to decomposition treatment by putting the anaerobic treatment water in contact with the aerobic microorganisms adhered to surfaces of the carriers. The aerobic filter bed section is provided with an air port which takes in air into under normal pressure, thereby activating the aerobic microorganisms.

Abstract: Compounds of the formula ##STR1## wherein R.sub.1 and R.sub.2 are each C.sub.16-18 long-chain aliphatic acyl and are the same or different; and pharmacologically acceptable salts thereof are disclosed. These novel compounds are effective against 5-FU-resistant tumor cells, have low toxicity, and are not inactivated by nucleoside phosphorylase in vivo.

Abstract: A compound of the formula ##STR1## wherein A is adenine-9-yl and X is halogen, Preferably iodine, or a pharmaceutically acceptable salt thereof. It is a novel derivative of neplanocin A and has almost the same level of cytotoxic activity. However, it is not inactivated by the action of adenosine deaminase. It is produced by replacing a hydroxyl at position-6' in neplanocin A or 2', 3'-O-protected neplanocin A with halogen by use of a halogenating agent, and when hydroxyl at position-2' or -3' is protected, removing the protective group thereof.