Results 21 to 30 of about 503,811 (193)

Two New Fumarprotocetraric Acid Lactones Identified and Characterized by UHPLC-PDA/ESI/ORBITRAP/MS/MS from the Antarctic Lichen Cladonia metacorallifera

Separations, 2022
Lichens are symbiotic organisms between algae and fungi, which are makers of secondary compounds named as lichen substances. Hyphenated techniques have significantly helped natural product chemistry, especially UHPLC/ESI/MS/MS in the identification ...
Beatriz Sepúlveda, Alberto Cornejo, Daniela Bárcenas-Pérez, José Cheel, Carlos Areche   +4 more
doaj   +1 more source

Biosynthetic gene cluster synteny: Orthologous polyketide synthases in Hypogymnia physodes, Hypogymnia tubulosa, and Parmelia sulcata

MicrobiologyOpen, 2023
Lichens are symbiotic associations consisting of a photobiont (algae or cyanobacteria) and a mycobiont (fungus), which together generate a variety of unique secondary metabolites.
Nadim Ahmad, Manfred Ritz, Anjuli Calchera, Jürgen Otte, Imke Schmitt, Thomas Brueck, Norbert Mehlmer   +6 more
doaj   +1 more source

Genetic Basis of Self-Incompatibility in the Lichen-Forming Fungus Lobaria pulmonaria and Skewed Frequency Distribution of Mating-Type Idiomorphs: Implications for Conservation [PDF]

, 2012
Fungal populations that reproduce sexually are likely to be genetically more diverse and have a higher adaptive potential than asexually reproducing populations.
Dal Grande, Francesco, Christoph Scheidegger (113130), Schmitt, Imke, Carolina Cornejo, Imke Schmitt (104151), Scheidegger, Christoph, Cornejo, Carolina, Carolina Cornejo (113129), Francesco Dal Grande (113128), Garima Singh, Imke Schmitt, Christoph Scheidegger, Singh, Garima, Francesco Dal Grande, Garima Singh (113127)   +14 more
core   +2 more sources

Heavy Metal Behavior in Lichen-Mine Waste Interactions at an Abandoned Mine Site in Southwest Japan

Metals, 2015
The lichen, Stereocaulon exutum Nylander, occurring in a contaminated abandoned mine site was investigated to clarify (1) the behavior of heavy metals and As during the slag weathering processes mediated by the lichen; and (2) the distribution of these ...
Yuri Sueoka, Masayuki Sakakibara, Koichiro Sera   +2 more
doaj   +1 more source

Screening Evaluation of Antiproliferative, Antimicrobial and Antioxidant Activity of Lichen Extracts and Secondary Metabolites In Vitro

Plants, 2023
Lichen metabolites represent a wide range of substances with a variety of biological effects. The present study was designed to analyze the potential antiproliferative, antimicrobial and antioxidative effects of several extracts from lichens ...
Martin Kello, Michal Goga, Klaudia Kotorova, Dominika Sebova, Richard Frenak, Ludmila Tkacikova, Jan Mojzis   +6 more
doaj   +1 more source

Secondary metabolites of lichens in the snow zone of the Sierra Nevada in Mérida-Venezuela and their role in the absorption of ultraviolet radiation

Anales del Jardín Botánico de Madrid, 2008
Photochemical analyses of secondary compounds in lichens from the venezuelan andean snow zone were carried out in order to know the absorbance capacity of UV radiation at the UVA, UVB and UVC ranges and to determine its probable UV protective function ...
José Alberto Rojas-Fernández, Alirio Balza-Quintero, Vicente Marcano, Paula Andrea Rojas, Delsy Dávila-Vera, Zulma Peña-Contreras, Rosa Virginia Mendoza-Briceño, Ernesto Palacios-Prü   +7 more
doaj   +1 more source

Fourteen degrees of latitude and a continent apart: comparison of lichen activity over two years at continental and maritime Antarctic sites [PDF]

, 2010
There are marked declines in precipitation, mean temperatures and the number of lichen species with increasing latitude in Antarctica. However, it is not known which factors are the predominant controllers of biodiversity changes.
Burkhard Schroeter, Green, T.G. Allan, Schlensog, Mark, T.G. Allan Green, Sancho, Leopoldo G., Stefan Pannewitz, Leopoldo G. Sancho, Pannewitz, Stefan, Schroeter, Burkhard, Mark Schlensog   +9 more
core   +1 more source

A Role for Secondary Metabolites in Desiccation Tolerance in Lichens

Microbiology Research
In lichens, secondary metabolites have been shown to protect against biotic stresses such as pathogen attacks and grazing, and abiotic stresses such as ultraviolet (UV) and high photosynthetically active radiation (PAR).
Nqobile Truelove Ndhlovu, Farida Minibayeva, Richard Peter Beckett   +2 more
doaj   +1 more source

Are Ionic Liquids Better Extracting Agents Than Toxic Volatile Organic Solvents? A Combination of Ionic Liquids, Microwave and LC/MS/MS, Applied to the Lichen Stereocaulon glareosum

Frontiers in Chemistry, 2020
We report a green strategy for the extraction of lichen substances from Stereocaulon glareosum. This sustainable alternative does not use volatile toxic organic solvents, but it is assisted by microwave and is checked by UHPLC/ESI/MS/MS.
Erika Calla-Quispe, Juana Robles, Carlos Areche, Beatriz Sepulveda   +3 more
doaj   +1 more source

THE SIGNIFICANCE OF ACIDIC LICHEN SUBSTANCES IN THE ESTIMATION OF CHLOROPHYLL AND PHAEOPHYTIN IN LICHENS [PDF]

New Phytologist, 1977
SUMMARYAcidic lichen substances are shown to be responsible for degrading extracted chlorophyll to phaeophytins in certain species of lichens and a method is proposed for eliminating this error during pigment extraction. The proposed extraction and measurement method is applied to lichens that have been maintained in either dry or deep frozen ...
D. H. BROWN, T. N. HOOKER
openaire   +1 more source