Irina A. Gorbunova

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Elemental composition of some species of mushrooms from Ust’-Koksa raion, Gorny Altai, was analyzed to identify species that accumulate the highest concentrations of heavy metals and to estimate the ecological state of the area. The method of X-ray fluorescence analysis using synchrotron radiation was employed.
We find the threshold between avoidable and unavoidable repetitions in circular words over k letters for any k > 6. Namely, we show that the number CRT(k) = ⌈k/2⌉+1 ⌈k/2⌉ satisfies the following properties. For any n there exists a k-ary circular word of length n containing no repetition of exponent greater than CRT(k). On the other hand, k-ary circular(More)
Toxicity and antiviral activity of aqueous extracts from higher mushrooms such as Lentinula edodes (Berk.) Pegler (shiitake), Pleurotus ostreatus (Jacq.) P. Kumm. (oyster), Inonotus obliquus (Ach. ex Pers.) Pilát (chaga), Hydnellum compactum (Pers.) P. Karst. (compact tooth) were studied. In doses of 0.8 to 4.0 mg (dry weight) per mouse administered orally(More)
The recently confirmed Dejean’s conjecture about the threshold between avoidable and unavoidable powers of words gave rise to interesting and challenging problems on the structure and growth of threshold words. Over any finite alphabet with k ≥ 5 letters, Pansiot words avoiding 3-repetitions form a regular language, which is a rather small superset of the(More)
Algae, lichens, mushrooms, Bryophyta, and higher vascular plants that grow in West and Central Siberia are quite diverse. Their spatial arrangement is presented at levels of plain and mountainous territories, vegetation zones and subzones, altitudinal belts, and the most widespread ecosystems.
The paper considers the major problems of arid soil formation in the works of M.A. Glazovskaya, including the biogeochemical role of living organisms, soil formation in high-mountain cryo-arid deserts, and the polygenic origin of arid soils, as well as the significance and importance of the assigned tasks for developing soil science and understanding modern(More)