The balance of nitrogen and composition of proteins inPleurotus ostreatus grown on natural substrates

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Abstract
The balance of nitrogen and nitrogen compounds inPleurotus ostreatus, cultivated on waste materials, corn straw and maize residues, was investigated. The results show that this organism has a considerable ability to fix atmospheric nitrogen, fixing 312 g of total nitrogen per 100 kg dry weight. When recalculating with respect to a decrease of the substrate during growth of the organism a value of 9.7 mg per 1 g of the decrease in material is obtained. Fruiting bodies, as well as the produced substrate contain 17–19 amino acids. In the produced substrate the content of the protein nitrogen represents only 30% of the total. It can be concluded thatPleurotus ostreatus yields a suitable raw material in the food industry and possibly also a fodder based on the basis of solid, cellulose-containing wastes.

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