Reference health
Occurrence of usnic acid in Usnea laevis Nylander (lichenized ascomycetes) from the Venezuelan Andes
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15/15 checkable references clean · checked 2026-07-23
Every reference with a DOI in the deposited reference list resolved to a known work in Crossref or DataCite at the dated check, and none carried a retraction, withdrawal, or removal notice.
15 without a DOI — not checked. A reference deposited without a DOI is never matched by title or guessed at; it stays outside the checked set, and this line discloses that.
The 15 checked references that resolve
resolves10.1016/S0006-291X(80)80074-X
Binding studies of L-usnic acid to D-fructose-6-P aminotransferase
resolves10.1515/znc-1982-5-606
Purification and Properties of Glucosaminephosphate Isomerase of Proteus mirabilis
resolves10.1016/0021-9673(72)80013-X
Improved conditions and new data for identification of lichen products by standardized thin-layer chromatographic method
resolves10.1016/S0021-9673(00)99256-2
A standardized two-dimensional thin-layer chromatographic method for lichen products
resolves10.1016/S0021-9673(00)81336-9
Substitution of methyl tert.-butyl ether for diethyl ether in the standardized thin-layer chromatographic method for lichen products
resolves10.1016/S0021-9673(00)83967-9
A standardized method for the identification of lichen products
resolves10.1002/bms.1200070707
Lichen substances—126 mass spectroscopy of natural products—10. Comparative positive and negative ion mass spectroscopy of usnic acid and related compounds
resolves10.1002/oms.1210080117
Mass spectral fragmentation studies in usnic acid and related compounds
resolves10.1128/AAC.39.11.2541
In vitro activities of the lichen secondary metabolites vulpinic acid, (+)-usnic acid, and (-)-usnic acid against aerobic and anaerobic microorganisms
resolves10.1002/oms.1210010409
Chemistry of lichen constituents—VI: Mass spectra of usnic acid, lichexanthone and their derivatives
resolves10.1111/j.1365-3040.1978.tb00742.x
Quaternary structure changes and kinetics of urease inactivation by L‐usnic acid in relation to the regulation of nutrient transfer between lichen symbionts
The 15 references without a DOI — listed, not checked
no DOI — not checkedAction of l-usnic acid on glucosamine phosphate isomerase activity of Proteus mirabilis
no DOI — not checkedCulberson, C.F., 1969. Chemical and Botanical Guide to Lichen Products. The University of Carolina Press, Chapel Hill, 628 pp.
no DOI — not checkedMitteilungen über Flechteninhaltsstoffe. LXXXIII. Zur Phytochemie und Chemotaxonomie einiger Usnea-Arten
no DOI — not checkedGalloway, D.J., 1985. Flora of New Zealand. Lichens. P.D. Hasselberg, Government Printer, Wellington, New Zealand, 637 pp.
no DOI — not checkedUsnic acid, a selective antimicrobial agent against Streptococcus mutans—a pilot clinical study
no DOI — not checkedMitteilungen über Flechteninhaltsstoffe. CX. Zur Phytochemie und Chemotaxonomie einiger Usnea-Arten. 2
no DOI — not checkedPropiedades Biomédicas de las Embriofitas Asifonogamas Andinas. Parte II. Lı́quenes
no DOI — not checkedMarcano, V., 1994a. Introducción al estudio de los lı́quenes y su clasificación (Serie Flora Liquénica de los Andes Venezolanos, vol. 1). Science, Technology, Arts and Crafts Museum Publications, Foundation for the Development of the Science and Technology FUNDACITE, Immeca Press, Mérida, 338 pp.
no DOI — not checkedMarcano, V., 1994b. Aplicaciones biomédicas de las sustancias liquénicas en enfermedades tropicales. In: Simposio Avances en Liquenologı́a Aplicada, VI Congreso Latinoamericano de Botánica, Mar del Plata. Resumenes, 88.
no DOI — not checkedMarcano, V., 1998. Aplicaciones biomédicas de sustancias liquénicas presentes en lı́quenes Neotropicales. In: Fortunato, R.H., Gunter, D. (Eds.), Proceedings of the VI Congreso Latinoamericano de Botánica, Monographs in Systematic Botany. Missouri Botanical Garden, St. Louis, Vol. 1.68, pp. 251–273.
no DOI — not checkedRichardson, D.H.S., 1988. Use of lichens in medicine. In: Galun, M. (Ed.), CRC Handbook of Lichens, vol. III. CRC Press, Boca Raton, FL, pp. 103–106.
no DOI — not checkedSwinscow, T.D.V., Krog, H., 1988. Macrolichens of East Africa. British Museum (Natural History), London, 390 pp.
no DOI — not checkedReassignment of the H-1NMR signals of the methyl-groups of usnic acid
no DOI — not checkedl-Usnate and permeability
no DOI — not checkedA new guide to microchemical techniques for the identification of lichen substances
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