Page 3594 of 3644 Results 35931 - 35940 of 36434
Id/Author/Year/TitleOrder by:  Year  Id  Author  Title
35708
Castañeta G., Sepulveda B., Vargas R., Garcia-Beltran O., Simirgiotis M. & Areche C. (2023): A sustainable application for the extraction of lichen metabolites from Usnea cornuta: nontargeted metabolomics and antioxidant activity - Natural Product Research, 37(12): 2076‒2082

In this study, isolation and purification of lichen substances from Usnea cornuta were performed using conventional solvents, green solvents and green technologies. In addition, several lichen compounds were tentatively identified by UHPLC/ESI/MS/MS and usnic acid, diffractaic and galbinic acids were quantified as well. Limonene, ethyl lactate and methanol, were compared regarding their extraction properties and antioxidant capacities, determined by DPPH, ORAC, and FRAP assays. In the ethyl … URL EndNote PDF Read more... 

35709
Nguyen H.-H., Duong T.-H., Nguyen T.V.A., Do T.-H., Pham D.-D., Nguyen N.-H. & Truong Nguyen H. (2023): α-Glucosidase inhibitory derivatives of protocetraric acid - Natural Product Research, 37(12): 1935‒1946

Lichen-derived depsidones have been a successful source for alpha-glucosidase inhibitory agents with numerous advantages. In this article, derivatives of protocetraric acids were designed and synthesised. Diels-Alder reaction, esterification, and Friedel-Crafts alkylation of protocetraric acid with different reagents under Lewis acid were performed. Eleven products were prepared, including 10 new compounds and parmosidone A. Among them, compounds 2–4 and 6 had the novel skeletons. The newly … URL EndNote PDF Read more... 

35710
Nguyen V.-K., Nguyen-Si H.-V., Devi A.P., Poonsukkho P., Sangvichien E., Tran T.-N., Yusuke H., Mitsunaga T. & Chavasiri W. (2023): Eumitrins F-H: three new xanthone dimers from the lichen Usnea baileyi and their biological activities - Natural Product Research, 37(9): 1480‒1490

The lichen Usnea baileyi is a fruticose lichen belonging to the Usnea genus. It is well known as a rich source of natural xanthone dimers and possesses various bioactivities. Nevertheless, the chemical investigation on this type of lichen is still rare as most of researches reported its components without structural elucidation. Herein, in the continuous study on this type of lichen, we further isolate xanthone dimers from the dichloromethane extract and explore three new xanthone dimers, eumitrins … URL EndNote PDF Read more... 

35711
Nguyen T.-Q.-T., Pham N.-K.-T., Trung N.T., An T.N., Mai D.-T., Sichaem J., Huynh B.-L.-C., Anh N.T.H., Nguyen N.-H. & Duong T.-H. (2023): Indicuen, a new hopane from Parmotrema indicum Hale growing in Vietnam - Natural Product Research, 37(8): 1284‒1291

One new hopane-type triterpene, indicuen (1), along with eight known compounds (2–9) were isolated from the n-hexane extract of the lichen Parmotrema indicum Hale. The chemical structures of isolated compounds were identified by interpretation of their spectroscopic data (1D, 2D NMR and HRESIMS) combined with DFT-NMR chemical shift calculations and subsequent assignment of DP4+ probabilities and by comparison with the literature. Indicuen represents for a rare hopane bearing a 1-carboxyethyl substituent … URL EndNote PDF Read more... 

35712
Sepulveda B., Benites D., Albornoz L., Simirgiotis M., Castro O., Garcia-Beltran O. & Areche C. (2023): Green ultrasound-assisted extraction of lichen substances from Hypotrachyna cirrhata. Ethyl lactate, a better extracting agent than methanol toxic organic solvent? - Natural Product Research, 37(1): 159‒163

For the first time, we report a green extraction of lichen substances assisted by high power ultrasounds from Hypotrachyna cirrhata using ethyl lactate. This sustainable alternative was comparable, both in isolation and detection of lichen substances, to methanol. In the metabolomic analysis, a total of 77 lichen substances were detected comprising depsides, depsidones, dibenzofurans, organic acids, and lipids. Although the UHPLC/ESI/ MS profiles were similar, the antioxidant activity was … URL EndNote PDF Read more... 

35713
Toksoz O., Turkmenoglu I., Berber D., Caglayan P., Birbir M. & Sesal N.C. (2023): Evaluation of antibacterial potencies of eight lichen extracts against gram-positive moderately halophilic bacteria : ecological materials to control moderately halophilic bacteria for leather preservation - Johnson Matthey Technol. Rev., 67(1): 85–96

The leather sector has global economic importance. Overcoming microbiological problems, especially arising from halophilic bacteria, will greatly reduce product losses. In this study, lichen species including Usnea sp., Platismatia glauca, Ramalina farinacea, Evernia divaricata, Bryoria capillaris, Hypogymnia tubulosa, Pseudevernia furfuracea and Lobaria pulmonaria were examined for their antibacterial efficacies against Staphylococcus saprophyticus subsp. saprophyticus (TR5) and Salinicoccus roseus … URL EndNote PDF Read more... 

35714
Ohmaki A., Okane I., Crous P.W. & Verkley G.J.M. (2023): Cylindromonium dirinariae sp. nov. (Ascomycota, Hypocreales), a new nectrioid lichenicolous species on Dirinaria applanata in Japan - Fungal Systematics and Evolution, 11: 1–10

A nectrioid fungus forming a pinkish colony with mainly solitary phialides producing ellipsoid, aseptate conidia in mucoid packets was isolated from Dirinaria applanata. Our taxonomic study based on morphology and phylogenetic analysis using ITS rDNA sequences revealed that the isolates represented a member of the genus Cylindromonium. Based on further morphological examination, nucleotide sequence comparison, and phylogenetic analysis based on LSU rDNA, tef1, and rpb2 in addition to the phylogenetic … URL EndNote PDF Read more... 

35715
Knudsen K., Kocourková J., Hodková E., Malíček J. & Wang Y. (2023): Acarosporaceae of New Mexico: eight new species of Acarospora and Sarcogyne - Western North American Naturalist, 83(1): 51–88

Eight new species are described from the Chihuahuan Desert in southern New Mexico: Acarospora agostiniana, A. divisa, A. fissurata, A. ryanii, Sarcogyne brouardiana, S. coeruleonigricans, S. malpaiensis, and S. nogalensis. Three species, Acarospora coloradiana, A. peltastica, and A. utahensis are not treated as synonyms of A. strigata, a South American endemic. Thirty-four species of Acarosporaceae are reported from the Chihuahuan Desert in southern New Mexico. Fifty-six species of Acarosporaceae … URL EndNote Read more... 

35716
Brackel W. v. & Wirth V. (2023): Flechtenbewohnende Pilze im Naturraum Schwarzwald (südwestliches Deutschland) - Herzogia, 36(1): 84–130

Lichenicolous fungi known from the natural region Black Forest are listed, mainly based on recent finds. On the whole, 197 taxa are mentioned, including 183 described obligately lichenicolous fungi. Lichenosticta wirthii (on Loxospora cismonica) and Tremella altimontana (on Caloplaca cerina) are described as new to science. Further 17 species are new to Germany: Carbonea aggregantula, Clypeococcum cladonema, Didymocyrtis melanelixiae, Endococcus sardous, Lichenostigma rupicolae, Minutophoma chrysophthalmae, … EndNote Read more... 

35717
Joshi Y. & Bansal P. (2023): A new species of Stigmidium (Mycosphaerellaceae) on Bulbothrix setschwanensis (Parmeliaceae) from India - Herzogia, 36(1): 161–168

Stigmidium bulbothricis, parasiting the thallus of Bulbothrix setschwanensis is described as new to science from India. This is the twelfth species of Stigmidium growing on members of the family Parmeliaceae, and the first species on Bulbothrix. It is characterized by stromatic wart formations on the thallus of the host, a compound of multilocular ascomata in a sterile stromatic tissue between and over the loculi, hamathecium of “type b” pseudoparaphyses, and hyaline, 1-septate narrow ascospores … EndNote Read more... 

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