Abstract: Agent for the removal of nucleic acids and/or endotoxin from a liquid containing the nucleic acids and/or endotoxin and further useful substances (e.g. proteins, hormones, etc.), which comprises as an active ingredient a chitosan having a low molecular weight, particularly that having an intrinsic viscosity of 0.01 to 5 (dl/g) and further a colloid equivalent of not less than 2 meq/g of evaporated residue.

Abstract: A printing apparatus including a printing sheet guide for supporting a single printing sheet, a page feeder for successively feeding a plurality of continuous sheets to a printing section, and a sound absorber and a noise silencing cover for avoiding release of noise to outside. The printing apparatus has a front cover located forwardly of an upper cover for a printer body for movement between an open position and a closed position, and a pair of brackets are inserted in engaging holes formed on opposite sides of the upper cover. The printing sheet guide and the noise silencing cover are detachably attached to the brackets, and the page feeder includes engaging portions located on opposite sides which are inserted in positions at the front cover outwardly of the sound absorber and the noise silencing cover and inwardly of hinged portions on opposite sides of the front cover to be releasably brought into engagement with a platen shaft.

Abstract: A process for dewatering aqueous sludges of organic nature by adding to the sludge a cationic organic flocculant to effect a first stage agitation of vigorous intensity, and then adding thereto an anionic organic flocculant to perform a second stage agitation of mild intensity and subjecting the thus formed flocs to a dewatering operation, which process comprises the use of a cationic organic flocculant composed of any combination of A- and B-components, wherein the A-component consists of one or more polymers selected from the group consisting of A.sub.1 - and A.sub.2 -components, in which the A.sub.1 -component consists of polymers having a structural unit of vinylimidazoline or partially hydrolyzed products thereof and the A.sub.