In 1995, we installed surface-sterilized, rough-barked and smooth-barked tree branches in clearcuts, young forests, and old growth. Half of the experimental branches were inoculated with propagules of the epiphytic cyanolichen, Lobaria oregana. In 1997, we concluded that L. oregana was associated with old-growth Douglas-fir forests because of dispersal limitation; addition of L. oregana propagu...

Increasing temperature and changing land-use in the Guayana Shield Amazonia result an accelerated decline of sensitive lichen populations. Monitoring these populations by biological plot inventories particularly vulnerable sites is urgently needed. In order to know diversity distribution species at Alto Orinoco, Parque Nacional Duida-Marahuaca nearby areas from Amazonas state, Venezuela, lichen...

Introduction: α-amylase is a major form of amylase found in humans and other mammals. It is the special key enzyme involved in carbohydrates breakdown. Inhibition of this enzyme could be used in treatment of diabetes. In this study, the effect of ten Iranian macrolichens on alpha amylase were tested. Methods: Different concentrations of the extracts (25, 50 and 75 mg/ml) were incubated wi...

New resources of food, pharmaceuticals or biotechnological products are needed. The huge biodiversity aero-terrestrial lichen-symbiont microalgae belonging to the Chlorophyta group remains unexplored despite they present interesting features such as extreme stress tolerance and growth in water shortage. Appropriateness for human consumption demands demonstration absence toxic effects. In vitro ...

Abstract Little is known about the chlorophyll fluorescence spectra for high latitude plants. A FluoWat leaf clip was used to measure leaf-level reflectance and of leaves common plants examine general spectral characteristics these species. Fluorescence yield (Fyield) calculated as ratio emitted divided by absorbed radiation wavelengths from 400 nm up wavelength cut-off low pass filter (either ...