TECHNOLOGY FOCUS - BIOLOGY - Preferred Process: The pretreated biomass has been pretreated mechanically, chemically, enzymatically and/or by heat. The fermentation is carried out by bacteria, yeast, algae and/or fungi. The amount of phage receptor proteins in step (a) is present in an amount which enhances the productivity of the fermentation process. The step (a) and step (b) are performed simultaneously. The fermentation process additionally involves recovering of the compound from the fermented material. Preferred Components: The components comprising polysaccharides of step (a) are bacterial polysaccharides, biomass and/or pretreated biomass. The bacterial polysaccharides are O-antigens of lipopolysaccharides or K-antigens of capsular polysaccharides, components of teichoic or lipoteichoic acids, of peptidoglycan, of extracellular components, in particular capsules or slime layers, of carbohydrates, of polysaccharide matrices, of lipopolysaccharides, or fragments of these components. The biomass is crops, corn, wheat, barley, sorghum, rye, sugar cane, potato, cottonwoods, paper, switchgrass, bagasse, wood, cornstover or corn fibers. The phage receptor protein is derived from a bacteriophage selected from P22, epsilon 15, Sf6, SP6, K1, K5, HK620, Det7, T1, T5, T7, phage 14, P2, phiV10, APSE-1, A1, A18a, ST104, ST64T, SETP3, JK106 and Gifsy. The phage receptor protein is selected from P22 TSP according to SEQ ID NO: 1 (available on WIPO website), Sf6 TSP according to SEQ ID NO: 2 (available on WIPO website), HK620 TSP according to SEQ ID NO: 3 (available on WIPO website), Det7 Tsp according to SEQ ID NO: 4 (available on WIPO website), epsilon 15 tailspike according to SEQ ID NO: 5 (available on WIPO website), K5 lyase A (KflA) according to SEQ ID NO: 6 (available on WIPO website), HylP2 according to SEQ ID NO: 7 (available on WIPO website), K1F TSP according to SEQ ID NO: 8 (available on WIPO website) and PhiV10 TF according to SEQ ID NO: 9 (available on WIPO website). EXAMPLE - No suitable example given.