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escherichia":
5 articles found in Index.
SANTIAGO K.A.A., DELA CRUZ T.E.E., TING A.S.Y. (2021): Diversity and bioactivity of endolichenic fungi in Usnea lichens of the Philippines. [antibacterial, anticandidal, antioxidant, lichen-associated, Sagada.] Czech Mycology 73(1): 1-19 (published: 14th January, 2021) Electronic supplement
abstract
Endolichenic fungi (ELF; asymptomatic microorganisms living inside healthy lichen thalli) were isolated from three Usnea species, namely U. baileyi, U. bismolliuscula and U. pectinata, collected near the town of Sagada, Philippines. A total of 101 ELF were recovered representing 12 genera (classes Sordariomycetes and Eurotiomycetes), with the genera Nemania (50.5%, 51 isolates) and Xylaria (22.8%, 23 isolates) being the most abundant. Comparative analyses on the antimicrobial activities of lichens and ELF revealed that lichen crude extracts were effective against the Gram-positive bacterium Staphylococcus aureus and the yeast Candida albicans, while ELF crude extracts were effective against S. aureus, C. albicans and the Gram-negative bacterium Escherichia coli. The broad-spectrum nature of ELF has provided medicinal and industrial advantages over the slow-growing lichens as shown on their respective bioactivities. Extracts from ELF also had a higher total flavonoid content (TFC; 6.29–85.69 mg QE/g of extract) and stronger antioxidant activities (IC50: 0.57–19.63 mg/ml) than lichen-derived extracts. Although only culturable ELF were identified, this study provides the first evaluation of the diversity and bioactivities of culturable ELF from fruticose lichens of the genus Usnea in the Philippines.
KRUPODOROVA T.A., BARSHTEYN V.YU., KIZITSKA T.O., POKAS E.V. (2019): Effect of cultivation conditions on mycelial growth and antibacterial activity of Lentinula edodes and Fomitopsis betulina. [xylotrophic basidiomycetes, shiitake, Piptoporus, fungal growth conditions, fungal antibiotic activity.] Czech Mycology 71(2): 167-186 (published: 13th December, 2019)
abstract
This research dealt with the effect of cultivation conditions on mycelial growth and antibacterial activity of Lentinula edodes and Fomitopsis betulina in liquid static culture. The antibacterial activity of mycelium and culture liquid were assayed against the bacteria Bacillus subtilis, Staphylococcus aureus and Escherichia coli using the disk diffusion method. The optimum incubation period of mycelial growth for both species and their antibacterial activity was 14 days. The biomass of the studied species was the largest at temperatures of 26–28 °C. The highest mycelium production was recorded at pH 3.5–4.0, whereas the strongest antibacterial activity was observed at pH 5.5. Of the carbon sources tested, the highest mycelium productivity of L. edodes was recorded for glucose, followed by cellulose. Cellulose was found to be the optimal carbon source for the highest antibacterial activity of L. edodes. Cellulose was also the optimal carbon source for mycelial growth in F. betulina, but the highest antibacterial activity was achieved with added galactose. For both fungal species, asparagine was found to be the nitrogen source producing a maximum biomass, whereas the highest antibacterial activity of L. edodes and F. betulina was noticed after adding ammonium nitrate and peptone, respectively. The antibacterial potential of culture liquids appeared to be higher in the studied species when compared to their mycelium. Establishing optimum cultivation conditions will allow for obtaining maximum productivity of mycelium and culture liquids with the highest antibacterial activity.
KLÁN J., RULFOVÁ I. (1989): Antibiotic activity of cultures of some saprotrophic basidiomycetous fungi. Česká Mykologie 43(2): 85-95 (published: 2nd May, 1989)
abstract
The antibiotic activity against microorganisms Bacillus subtilis, Candida pseudotropicalis, Escherichia coli and Sarcina lutea was tested in 97 species of mycelial cultures (110 strains) from saprotrophic Basidiomycotina, using the diffusion plate method. Activity was found in 55.4% of strains. The study also included rare species previously not tested. Antibiotic activity is evaluated as a biochemical taxonomic feature.
ŠAŠEK V., MUSÍLEK V. (1968): Antibiotic activity of mycorrhizal Basidiomycetes and their relation to thehost-plant parasites. Česká Mykologie 22(1): 50-55 (published: 1968)
abstract
35 strains (17 species) of mycorrhizal Basidiomycetes were cultured with Pinus silvestris seedlings. The fungi showed only slight antibiotic activity, which did not increase with seedling presence. In 12% of tests, growth of parasitic fungi was inhibited. Rhizoctonia solani was the most inhibited species.
MACURA J. (1959): Academiae sodali I. Málek quinquagenario ad salutem! Česká Mykologie 13(4): 193-195 (published: 20th October, 1959)
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