NOVELTY - The photobioreactor (1) comprises a chamber (2) for culturing cells. The chamber has a non-opaque frontside glazing unit (3), which has an interior surface (30) making contact with an interior of the chamber. The frontside glazing unit comprises: a first glass substrate that is provided with a thin-film multilayer comprising an alternation of functional metal films based on silver or a silver-containing metal alloy and antireflection coatings; a second glass substrate; and a plastic material sheet disposed between the substrates.    USE - The closed photobioreactor is useful for culturing biological cells in a fixed medium and for creating biomass for animal feed.    ADVANTAGE - The photobioreactor ensures efficient culturing of biological cells without the emission of greenhouse gases.    DETAILED DESCRIPTION - The photobioreactor (1) comprises a chamber (2) for culturing cells. The chamber has a non-opaque frontside glazing unit (3), which has an interior surface (30) making contact with an interior of the chamber. The frontside glazing unit comprises: a first glass substrate that is provided with a thin-film multilayer comprising an alternation of n-functional metal films based on silver or a silver-containing metal alloy and (n+1) antireflection coatings, where n is an integer of 3; a second glass substrate; a plastic material sheet disposed between the substrates; and a thin antireflection multilayer. Each antireflection coating comprises: an antireflection film, where each functional film is placed between two antireflection coatings; and a silicon nitride based layer or aluminum nitride based layer. The thin-film is disposed on a face of the substrate other than an inner surface, which is in contact with the interior of the chamber. The frontside glazing unit is a laminated glass, and has an external surface, which is textured by geometric patterns with respect to a plane of the surface. A total thickness of the functional metal films is 40-60 nm. The patterns comprise two planes intersecting with each other, where the planes are perpendicular to the plane of the textured surface and contain two lines that are perpendicular to the surface and pass through the planes.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic view of a photobioreactor.    Photobioreactor (1)    Chamber (2)    Non-opaque frontside glazing unit (3)    Interior surface (30)    Exterior surface. (31)