Abstract: In a process for the cultivation of living cells, in which the cells are cultivated on a support structure (14), the support structure (14) comprises cellulose. A process for the production of a support structure (14) of cellulose for the cultivation of living cells comprises the steps: preparation of a hollow mould; cultivation of cellulose-forming organisms in an interior space formed by the hollow mould, in order to allow the support structure (14) to grow in the interior space; demoulding of the hollow mould. In the step of demoulding the hollow mould, at least part (2, 3, 4) of the hollow mould is irreversibly deformed.

Abstract: An elongate hollow body (1) comprising crystalline cellulose has on an inside wall a plurality of protuberances (3, 4) which extend into a lumen of the hollow body (1). A process for the production of an elongate hollow body (1) comprising crystalline cellulose comprises the steps: preparation of a hollow mold (12); cultivation of cellulose-forming organisms in an interior space formed by the hollow mold (12), in order to allow the hollow body (1) to grow in the interior space; demolding of the hollow mold (12). In the step of demolding the hollow mold (12), at least part of the hollow mold (12) is irreversibly deformed.

Abstract: Process for the production of a long hollow cellulose body, where cellulose-forming organisms are cultivated in an interior space formed by a hollow mold, said space substantially having the shape of the long hollow body, in order to allow the long hollow body to grow in the interior space, wherein the direction of growth of the hollow body runs substantially from a first longitudinal side of the interior space to a second longitudinal side substantially opposite the first.

Abstract: The invention relates to a method for producing a body (7) comprising cellulose with the help of cellulose-producing organisms, which are supplied with a nutrient solution. A particularly uniform structure and density of the cellulose bodies can be achieved when a vessel (1) having a membrane (4) is supplied, said membrane being permeable to the nutrient solution and is substantially impermeable to the organisms, wherein the organisms are cultivated on one side of the membrane (4), where a gas atmosphere prevails, and the nutrient solution is arranged on the other side of the membrane and passes through the membrane (4) in the direction of the organisms, to supply them.

Abstract: In a process for the production of a structure comprising crystalline cellulose (10), cellulose (10) -forming organisms are at least partly cultured in a hollow mould (5). The hollow mould (5) is produced by means of a 3D printer (1), which builds up at least a part (2a, 2b) of the hollow mould (5) in layers from a modelling material.

Abstract: An elongate hollow body (1) comprising crystalline cellulose has on an inside wall a plurality of protuberances (3, 4) which extend into a lumen of the hollow body (1). A process for the production of an elongate hollow body (1) comprising crystalline cellulose comprises the steps: preparation of a hollow mould (12); cultivation of cellulose-forming organisms in an interior space formed by the hollow mould (12), in order to allow the hollow body (1) to grow in the interior space; demoulding of the hollow mould (12). In the step of demoulding the hollow mould (12), at least part of the hollow mould (12) is irreversibly deformed.