Katalog - Lichenological literature

33789

Chiva S., Dumitru C., Bordenave C.D. & Barreno E. (2021): Watanabea green microalgae (Trebouxiophyceae) inhabiting lichen holobiomes: Watanabea lichenicola sp. nova, Phycological Research, 69(4): 226–236

Microalgae of the genus Watanabea are widely distributed as free living in soil/subaerial and aquatic habitats. In this study, two Watanabea spp. were isolated from lichen thalli of Buellia zoharyi collected on biocrusts in the Iberian Peninsula and the Canary Islands. To ascertain their taxonomic position and phylogenetic relationships within the genus Watanabea, morphological observations were performed using light and confocal microscopy, combined with molecular analyses based on the phylogeny … Read more...

33790

Ojha M., Kil Y.‐S., Youn U.J., Ok Y.J., Choi H. & Nam J.‐W. (2021): Compositional variation of atranorin‐related components of lichen Myelochroa leucotyliza dependent on extraction solvent and their quantitative analysis by qHNMR, Phytochemical Analysis, 32(6): 1067–1073

Quantitative nuclear magnetic resonance (qNMR) is one of the effective and reliable quantification tools for natural product research. Myelochroa leucotyliza belongs to the genus Myelochroa, a common foliose lichen genus found in the Korean Peninsula, and has not been quantitatively analysed using NMR. Previous chemical studies on M. leucotyliza have been limited to the main components by traditional thin‐layer chromatography (TLC) experiments. Myelochroa leucotyliza belongs to the genus Myelochroa, … Read more...

33792

Kikowska M., Thiem B., Jafernik K., Klimek-Szczykutowicz M., Studzińska-Sroka E., Ekiert H. & Szopa A. (2021): Effect of elicitation with (+)-usnic acid on accumulation of phenolic acids and flavonoids in agitated microshoots of Eryngium alpinum L., Molecules, 26: 5532 [11 p.]

The present work was aimed at studying the potential of elicitation on the accumulation of phenolic compounds in in vitro shoot cultures of Eryngium alpinum L., a protected plant from the Apiaceae family. The study examined the influence of (+)-usnic acid on the biomass growth as well as on the biosynthesis of the desired flavonoids and phenolic acids in the cultured microshoots. The phenolic compound content was determined by HPLC-DAD. The flavonoid of the highest concentration was isoquercetin, … Read more...

33793

Dyrkheeva N.S., Filimonov A.S., Luzina O.A., Zakharenko A.L., Ilina E.S., Malakhova A.A., Medvedev, S.P., Reynisson J., Volcho K.P., Zakian S.M., Salakhutdinov N.F. & Lavrik O.I. (2021): New hybrid compounds combining fragments of usnic acid and monoterpenoids for effective tyrosyl-DNA phosphodiesterase 1 inhibition, Biomolecules, 11: 973 [23 p.]

Usnic acid (UA) is a secondary metabolite of lichens that exhibits a wide range of biological activities. Previously, we found that UA derivatives are effective inhibitors of tyrosyl-DNA phosphodiesterase 1 (TDP1). It can remove covalent complex DNA-topoisomerase 1 (TOP1) stabilized by the TOP1 inhibitor topotecan, neutralizing the effect of the drugs. TDP1 removes damage at the 3′ end of DNA caused by other anticancer agents. Thus, TDP1 is a promising therapeutic target for the development of … Read more...

33794

Martínez D.N., Díaz-Álvarez E.A. & de la Barrera E. (2021): Selecting biomonitors of atmospheric nitrogen deposition: guidelines for practitioners and decision makers, Nitrogen, 2: 308–320

Environmental pollution is a major threat to public health and is the cause of important economic losses worldwide. Atmospheric nitrogen deposition is one of the most significant components of environmental pollution, which, in addition to being a health risk, is one of the leading drivers of global biodiversity loss. However, monitoring pollution is not possible in many regions of the world because the instrumentation, deployment, operation, and maintenance of automated systems is onerous. … Read more...

33795

Jonsson B.G., Dahlgren J., Ekström M., Esseen P.-A., Grafström A., Ståhl G. & Westerlund B. (2021): Rapid changes in ground vegetation of mature boreal forests—An analysis of Swedish National Forest Inventory data, Forests, 12: 475 [16 p.]

The boreal forest floor vegetation is critical for ecosystem functioning and an important part of forest biodiversity. Given the ongoing global change, knowledge on broad-scale changes in the composition and abundance of different plant species and species groups is hence important for both forest conservation and management. Here, we analyse permanent plot data from the National Forest Inventory (NFI) on changes in the vegetation over a 10-year period in four regions of Sweden. To limit the direct … Read more...

33796

Aptroot A. & Souza M.F. (2021): New lichen species and records from the Chapada dos Guimarães, Mato Grosso, Brazil, Cryptogamie, Mycologie, 42(10): 171–180

Three species of lichens are described as new from the Chapada dos Guimarães in Mato Grosso (Brazil): Astrothelium muriconicum Aptroot & M.F.Souza, sp. nov. which is the first species in the core group of the genus, the A. conicum-group, with muriform ascospores; Gassicurtia lopesiana M.F.Souza & Aptroot, sp. nov. which is characterized by red apothecium margins and lichexanthone in the thallus; and G. pruinosa M.F.Souza & Aptroot, sp. nov. which has brown pruinose, UV+ green discs and less red … Read more...

33797

Unal D., Gül U.D. & Silah H. (2021): Decolorization property of living Lichen Evernia prunastri on textile Acid Red P‑2BX dye, International Journal of Environmental Science and Technology, 18: 3469–3478

The removal of textile dye using the biosorption technique is important for improving water quality and avoiding the harmful effects of the traditional approach for removing wastewater on human health. Lichens are symbiotic organisms that have great potential for decolorization and degradation of textile dye. The present study evaluates Acid Red P-2BX dye decolorization by living lichen Evernia prunastri at the pH range of 2–10. Dye decolorization rates at pH 2 were 84.62%, 87.5% and 88.54% at … Read more...

33798

Salah M.B., Aouadhi C. & Khadhri A. (2021): Green Roccella phycopsis Ach. mediated silver nanoparticles: synthesis, characterization, phenolic content, antioxidant, antibacterial and anti‑acetylcholinesterase capacities, Bioprocess and Biosystems Engineering, 44: 2257–2268

In this study, we develop here for the first time an easy, eco-friendly method for synthesizing silver nanoparticles (AgNPs) using the lichen Roccella phycopsis. AgNPs formation was first determined by a color change of the lichen filtrate to brown, subsequent to addition of AgNO3 solution, and confirmed by a maximum absorbance peak at 425 nm in UV–vis spectrum. Scanning electron microscope images showed a spherical shape with a size distribution between 11 and 18 nm, while the elemental composition … Read more...

33799

Fernandes R.F., Alves G.A.S., Gonçalves R.V. & Temperini M.L.A. (2021): A methodology to identify the releasing of the amide‑containing β‑glucan from the Usnea lichen: A spectroscopic study, Journal of Polymers and the Environment, 29: 3105–3115

Polymer fractions from a biological matrix have been well-characterized by vibrational spectroscopy, XPS, CP/MAS 13C NMR, MALDI-TOF mass spectrometry, thermal analysis, and SEM, and all the results had corroborated for the chemical extraction of β-glucan polymers grafted amino groups by peptide bonds (namely NH2- β-glucan) as well as a cyclic oligosaccharide. Our primary purpose was to explore the polysaccharide extraction parameters in the sample of Usnea lichen, mainly in terms of extraction … Read more...