Lichens
Mostrando 1-12 de 54 artigos, teses e dissertações.
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1. DIFFERENTIAL RESPONSE OF EPIPHYTIC LICHEN TAXA TO AGRICULTURAL LAND USE IN A FRAGMENTED FOREST IN CENTRAL ARGENTINA
ABSTRACT The seasonally dry subtropical forest, especially the Espinal forest in central Argentina (one of the most fragmented ecoregions), is affected by intensive agricultural activity. These activities are the main anthropogenic sources of atmospheric nitrogen compounds and their effects on lichens have been extensively studied, making them excellent ecol
CERNE. Publicado em: 2020-06
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2. Physciaceae foliosas do Parque Estadual da Cantareira, estado de São Paulo. III. Espécies do Gênero Physcia
Resumo Este trabalho apresenta dados obtidos a partir do levantamento de espécimes de fungos liquenizados de hábito folioso coletados no Parque Estadual da Serra da Cantareira até o final da década de 1990 e depositados atualmente no herbário SP. Foram encontradas e analisadas amostras de seis espécies de fungos liquenizados pertencentes ao gênero Phy
Rodriguésia. Publicado em: 11/11/2019
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3. Antitumor effect of depsidones from lichens on tumor cell lines and experimental murine melanoma
Abstract Lichens have exhibited numerous biological activities, including growth inhibition of tumor cells. This study evaluated the antiproliferative activity of hypostictic and salazinic acids against tumor cell lines (B16-F10, PC-03, MCF7, HT-29, HEP-G2, K562 and 786-0) by the SRB assay in vitro and antitumor activity in experimental murine melanoma in vi
Rev. bras. farmacogn.. Publicado em: 17/10/2019
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4. Inhibition of growth of U87MG human glioblastoma cells by Usnea longissima Ach.
Abstract: Herbal medicines are efficient to reduce side effects in the fight against glioblastoma, which plays a critical role within brain cancer species. The recent studies designated for testing the effects of lichens that have shown numerous anticancer activities on glioblastoma so far. In the present study, different concentrations of water extract obta
An. Acad. Bras. Ciênc.. Publicado em: 07/10/2019
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5. Abiotic effects on the cover and richness of corticolous lichens on Araucaria angustifolia trunks
ABSTRACT Lichens play a key role in natural ecosystems, as they can function as primary producers, recycle minerals and fix nitrogen. Despite their environmental importance, little is known about lichen ecology in Brazil, and especially about how abiotic factors may influence their spatial distribution. In this study, we aimed to verify how the cover and ric
Acta Bot. Bras.. Publicado em: 21/09/2018
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6. Vitality of lichens under different light climates in an Araucaria forest (Pró-Mata RS, South Brazil) as determined by chlorophyll fluorescence
ABSTRACT The vitality of 64 lichen species (107 individual lichen thalli) growing under different light climates in an Araucaria forest in South Brazil was analyzed by chlorophyll fluorescence. Study sites were grouped according to their local light availability under full sunlight (about 2200 µmol m-2 s-1): 1 = low light, up to 20 µmol m-2 s-1; 2 = medium
Acta Bot. Bras.. Publicado em: 08/01/2018
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7. The Antifungal Activity of Naphthoquinones: An Integrative Review
ABSTRACT Naphthoquinones are the most commonly occurring type of quinones in nature. They are a diverse family of secondary metabolites that occur naturally in plants, lichens and various microorganisms. This subgroup is constantly being expanded through the discovery of new natural products and by the synthesis of new compounds via innovative techniques. In
An. Acad. Bras. Ciênc.. Publicado em: 2018
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8. Production and characterization of a biosurfactant produced by Streptomyces sp. DPUA 1559 isolated from lichens of the Amazon region
Surfactants are amphipathic compounds containing both hydrophilic and hydrophobic groups, capable to lower the surface or interfacial tension. Considering the advantages of the use of biosurfactants produced by microorganisms, the aim of this paper was to develop and characterize a biosurfactant produced by Streptomyces sp. DPUA1559 isolated from lichens of
Braz J Med Biol Res. Publicado em: 11/12/2017
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9. Chemotaxonomic Fingerprinting of Chilean Lichens Through Maldi and Electrospray Ionization Mass Spectrometry
The aim of this work was to study a fast, new, sensitive, and simple method for the chemotaxonomic classification of Chilean lichens (Teloschistes chrysophthalmus, Ramalina farinacea, Usnea pusilla, Ramalina chilensis and Stereocaulon ramulosum) using MALDI-TOF-MS and UPLC-ESI(-)-MS data. Lichens soluble proteins fingerprints were acquired by MALDI-TOF-MS an
Braz. arch. biol. technol.. Publicado em: 13/01/2015
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10. In vitro radical-scavenging activity, toxicity against A. salina, and nmr profiles of extracts of lichens collected from Brazil and Antarctica
Extracts of six lichen species collected from Brazil and Antarctica were investigated for their potential toxicity and radical-scavenging properties. The composition of the extracts was investigated using TLC and NMR, leading to identification of atranorin (1), along with salazinic (2), barbatic (3), α-alectoronic (4), α-collatolic (5), cryptochlorophaeic
Quím. Nova. Publicado em: 2014-07
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11. FATORES ASSOCIADOS À ESTRUTURA DA COMUNIDADE DE LIQUENS CORTICÍCOLAS CROSTOSOS EM DUAS ÁREAS DE CAATINGA NO ESTADO DE ALAGOAS. / FACTORS RELATED TO THE STRUCTURE OF LICHEN COMMUNITY CORTICICOLOUS CROSTOSOS IN TWO AREAS CAATINGA IN THE STATE OF ALAGOAS.
Cerca de um quinto dos fungos encontrados na natureza estão em simbiose com algas e/ou cianobactérias, a maior parte destes fungos é do Filo Ascomycota, com alguns representantes Basidiomycota. A esta associação, considerada uma estratégia nutricional de sucesso, dá-se o nome de liquenização, e à estrutura formada neste processo, líquen. Nesta uni
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 27/07/2012
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12. A COMUNIDADE DE MICROLIQUENS CROSTOSOS SOFRE ALTERAÇÃO AO LONGO DE GRADIENTES AMBIENTAIS NA CAATINGA? / A COMMUNITY OF SUFFERING MICROLIQUENS CROSTOSOS CHANGE ALONG ENVIRONMENTAL GRADIENTS IN CAATINGA?
Lichens are a quite diverse group of organisms and important components of the diversity of tropical forests since they act as pioneer organisms in the colonization of terrestrial environments and play various roles in ecosystems. However, studies on the ecology of lichens only in areas of Caatinga are still lacking. This study, which was held in a conservat
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/02/2012