Abstract: A method for the manufacture of an agarose separation gel: The method is characterized in comprising the steps of: i) providing a solution of agar, and ii) one, two or more substeps (ii.A, ii.B, ii.C etc) which each comprises desulphating thereby transforming agar to agarose having a degree of substitution of sulphate groups that is at most 75% of the degree of substitution of sulphate groups in native agar, iii) gelling the dissolved agar prior to step (ii) and/or securing so that the desulphated agar is in gel form at least after one or more of the substeps of step (ii), and imperatively after step (ii). An agarose separation gel that exhibits a. a plurality of methoxy groups each of which are at the same position as in native agar and with a degree of substitution in the range of 1-100% of the degree of substitution of native agar, and b. sulphate groups with a degree of substitution which is <75% of the degree of substitution for sulphate groups in native agar.

Abstract: A method for the removal of arsenic in a positive oxidation stage from an aqueous liquid comprising the steps of: i) providing a porous adsorbent which comprises a solid phase carrying a metal ion in a form (I) which is capable of binding the arsenic to give a metal ion form (II) comprising the metal ion and the arsenic; ii) contacting the aqueous liquid with the adsorbent for formation of form (II), iii) separating the aqueous liquid from the adsorbent, iv) optionally regenerating the adsorbent, and reusing it in cycles comprising steps (i)-(iv), The characterizing feature is that A) form (I) is a metal chelate (I), which •comprises a metal ion and a multidentate chelating group, •comprises three or more amino nitrogens which are directly attached to sp3 carbon and in an at least triplet wise manner can coordinate a metal ion, and, •can be transformed to form (II), and/or B) step (ii) prior to the formation of form (II) comprises the substeps of: •oxidising As (+III) to As(+V), and •securing zero amounts of

Abstract: A method for the manufacture of an agarose separation gel: The method is characterized in comprising the steps of: i) providing a solution of agar, and ii) one, two or more substeps (ii.A, ii.B, ii.C etc) which each comprises desulphating thereby transforming agar to agarose having a degree of substitution of sulphate groups that is at most 75% of the degree of substitution of sulphate groups in native agar, iii) gelling the dissolved agar prior to step (ii) and/or securing so that the desulphated agar is in g form at least after one or more of the substeps of step (ii), and imperatively after step (ii). An agarose separation gel that exhibits a. a plurality of methoxy groups each of which are at the same position as in native agar and with a degree of substitution in the range of 1-100% of the degree of substitution of native agar, and b. sulphate groups with a degree of substitution which is <75% of the degree of substitution for sulphate groups in native agar.

Abstract: An adsorption material and a process for retention of heavy metals from acqueous solutions and a process for production of the material are disclosed. The production process comprises a pre-treatment to cause covalent bonding of polyethylene-imine to cellulosic material. A filter unit and a filter device are also claimed.

Abstract: A grinding tool for grinding buttons of a rock drill bit includes a spindle having a longitudinal axis of rotation, and a grinding cup mounted on the spindle by a tongue-and-socket connection. A fastener in the form of a coil spring secures the grinding cup to the spindle. The grinding cup can be inserted into the inside of, or around the exterior of, the coil spring. When the spindle is rotated in a working direction, the spring tightens against the grinding cup. To install or remove the grinding cup, the grinding cup is rotated relative to the spindle in a direction corresponding to the working direction, whereby engagement between the grinding cup and the coil spring becomes loosened.