Spectrophotometric indicators of “Zamin-M” biopreparation immobilized with gypan flocculinateMutabar Khojanazarova, Rano Artikova, Gulchekhra Khalmuminova and Alisher OmonlikovE3S Web of Conf., 389 (2023) 03076DOI: https://doi.org/10.1051/e3sconf/202338903076