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International Journal of Medicinal Mushrooms
Главный редактор: Solomon P. Wasser (open in a new tab)

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ISSN Печать: 1521-9437

ISSN Онлайн: 1940-4344

The Impact Factor measures the average number of citations received in a particular year by papers published in the journal during the two preceding years. 2017 Journal Citation Reports (Clarivate Analytics, 2018) IF: 1.2 To calculate the five year Impact Factor, citations are counted in 2017 to the previous five years and divided by the source items published in the previous five years. 2017 Journal Citation Reports (Clarivate Analytics, 2018) 5-Year IF: 1.4 The Immediacy Index is the average number of times an article is cited in the year it is published. The journal Immediacy Index indicates how quickly articles in a journal are cited. Immediacy Index: 0.3 The Eigenfactor score, developed by Jevin West and Carl Bergstrom at the University of Washington, is a rating of the total importance of a scientific journal. Journals are rated according to the number of incoming citations, with citations from highly ranked journals weighted to make a larger contribution to the eigenfactor than those from poorly ranked journals. Eigenfactor: 0.00066 The Journal Citation Indicator (JCI) is a single measurement of the field-normalized citation impact of journals in the Web of Science Core Collection across disciplines. The key words here are that the metric is normalized and cross-disciplinary. JCI: 0.34 SJR: 0.274 SNIP: 0.41 CiteScore™:: 2.8 H-Index: 37

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Extracellular Catalase Activity in the Edible and Medicinal Mushroom Pleurotus ostreatus (Jacq.: Fr.) Kumm. (Basidiomycota)

Том 4, Выпуск 1, 2002, 7 pages
DOI: 10.1615/IntJMedMushr.v4.i1.80
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Краткое описание

Degradation oflignin requires a complex enzymatic system that includes oxidases, peroxidases, and H2O2-producing enzymes. A time-course study of extracellular catalase and glyoxal oxidase (GLOX) activity in liquid cultures of the edible and medicinal mushroom Pleurotus ostreatus (Jacq.: Fr.) Kumm. was performed. Activity levels of GLOX increased, reaching maximal activity at 6.9 mM H2O2/min on the 7th day of growth. Catalase activity followed the pattern of GLOX activity, and was highest on the 8th day of growth (1.49 mM H2O2 reduced/min). The patterns of GLOX and catalase activity under conditions of solid-state fermentation (SSF) resembled those in liquid culture, with both activities reaching their highest levels on day 13 of growth. This trend was also observed in Trametes versicolor (L.: Fr.) Lloyd but not in the non-lignin-degrading basidiomycete Sclerotium rolfsii Sacc. The enzymes superoxide dismutase (SOD) and fumarase were selected as intracellular markers, as their activities were apparent only in the intracellular sample. On the basis of these results, we suggest that the catalase activity was indeed extracellular. The addition ofl H2O2 (3.3 mM, 6.6 mM) to P. ostreatus cultures caused increases in catalase activity at 15 and 30 minutes, but a decrease at 45 minutes. The addition of glucose to 5-day-old P. ostreatus cultures induced low GLOX activity, but no catalase activity was detected. Extracellular catalase in lignin-degrading fungi may play two roles: it may protect the fungus from oxidative damage and it may protect ligninolytic peroxidases from inactivation which might be caused by H2O2 accumulation.

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