Kozyreva Elena Alexeevna RussiaSaratovSSU. Educational scientific institute of nanostructures and biosystems., 410012, Saratov, Astrakhanskaya str., 83 инженер отдела высокомолекулярных соединений kozyreva-ev@yandex.ru Author's articles ОСОБЕННОСТИ ФИЗИКО-ХИМИЧЕСКИХ СВОЙСТВ РАСТВОРОВ ХИТОЗАНА Materials to the Study of the Lichen Flora of the National Park «Khvalynsky» (Saratov Region) To the Question of Distribution of the Lemnaceaes’ Species and Communities with Their Participation in the Saratov Region Rare and Disappearing Fungus and Lichens Species to Be Included Into the Third Edition of the Red Book of Saratov Region