Abstract: Apparatus for generating gas by electrolysis of a liquid comprises an electrolysis cell, and first, second and third chambers. Liquid for supply to the electrolysis cell is stored in the first chamber. The second chamber contains liquid which is a product of the electrolysis reaction and is enriched with a first gaseous product of the electrolysis reaction, and has an outlet for controlled release of the first gaseous product. The third chamber contains liquid which is a product of the electrolysis reaction and is enriched with a second gaseous product of the electrolysis reaction, and has an outlet for controlled release of the third gaseous product. A first channel which connects the first and second chambers, and a second channel which connects the second and third chambers.

Abstract: A transgenic plant is prepared by a method n which a plant cell is transformed with a chimaeric gene comprising a promoter and a gene encoding a polypeptide which displays the activity of an enzyme which regulates the amount of a metabolic intermediate in glycolysis or in a pathway for the synthesis or degradation of starch, sucrose or reducing sugar from a glycotyltic intermediate. In stored potatoes the subject of the invention an increased level of phosphofructokinase results in reduced accumulations of sugars in the tubers.