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Pesquisa : B01.650.940.800.575.912.250.595.400 [Categoria DeCS]
Referências encontradas : 362 [refinar]
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[PMID]:29045488
[Au] Autor:Mo YQ; Li L; Li JW; Rohwer JG; Li HW; Li J
[Ad] Endereço:Plant Phylogenetics & Conservation Group, Center for Integrative Conservation, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Kunming, P. R. China.
[Ti] Título:Alseodaphnopsis: A new genus of Lauraceae based on molecular and morphological evidence.
[So] Source:PLoS One;12(10):e0186545, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:An investigation of a questionable species of the genus Alseodaphne led to the discovery of a new genus Alseodaphnopsis H. W. Li & J. Li, gen. nov., separated from Alseodaphne Nees, and a new species Alseodaphnopsis ximengensis H. W. Li & J. Li, sp. nov., endemic to Yunnan province, China. This new species is characterized by having big, axillary, paniculate inflorescences, as well as large, subglobose fruits. Based on DNA sequence data from two gene regions (nuclear ribosomal ITS and LEAFY intron II), we investigate its phylogenetic position within the Persea group. Phylogenies using maximum parsimony (MP) and Bayesian inference (BI) support the recognition of Alseodaphnopsis as a distinct genus but do not resolve well its relationship within the Persea group. The new genus is circumscribed, eight new combinations for its species are made, and a description and illustration of the new species are provided.
[Mh] Termos MeSH primário: Lauraceae/anatomia & histologia
Lauraceae/genética
[Mh] Termos MeSH secundário: Sequência de Bases
Teorema de Bayes
Bases de Dados Genéticas
Inflorescência/anatomia & histologia
Íntrons/genética
Tamanho do Órgão
Filogenia
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171031
[Lr] Data última revisão:
171031
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171019
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0186545


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[PMID]:29028818
[Au] Autor:Zeng G; Liu B; Ferguson DK; Rohwer JG; Yang Y
[Ad] Endereço:State Key Laboratory of Systematic and Evolutionary Botany, Institute of Botany, the Chinese Academy of Sciences, Beijing, China.
[Ti] Título:Floral structure and ontogeny of Syndiclis (Lauraceae).
[So] Source:PLoS One;12(10):e0186358, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Generic delimitation in the Beilschmiedia group of the Lauraceae remains ambiguous because flowering specimens of a few genera with confined distribution are poorly represented in herbaria, and a few floral characters important for taxonomy are still poorly known. Syndiclis is sporadically distributed in southwestern China, and is represented in the herbaria by only a few flowering specimens. We conducted field investigations to collect floral materials of four species and observed structures and ontogeny of the tiny flowers using both light microscopy (LM) and scanning electron microscopy (SEM). The results show that the genus Syndiclis possesses flowers with huge variation in both merosity and organ number. Flowers of the genus are dimerous, trimerous, or tetramerous, or have mixed merosity with monomerous and dimerous, or dimerous and trimerous, or trimerous and tetramerous whorls. The number of staminodes ranges from two to eight, depending on floral merosity, and on how many stamens of the third androecial whorl are reduced to staminodes. The staminodes of the fourth androecial whorl are comparable to the staminodes in Potameia, but the staminodes of the third androecial whorl of Syndiclis are relatively larger than the staminodes in Potameia. They are erect or curved inwards, covering the ovary. The anthers are usually two-locular, but rarely one-locular or three-locular. Each stamen of the third androecial whorl bears two conspicuous and enlarged glands at the base. The lability of floral merosity and organ number of Syndiclis may have been caused by changes of pollination system and loss of special selective pressures that are present in most Lauraceous plants with fixed floral organ number. This study furthers our understanding of variation and evolution of a few important characters of the Beilschmiedia group and provides essential data for a revised generic classification of the group.
[Mh] Termos MeSH primário: Flores/anatomia & histologia
Flores/crescimento & desenvolvimento
Lauraceae/anatomia & histologia
Lauraceae/crescimento & desenvolvimento
Desenvolvimento Vegetal
[Mh] Termos MeSH secundário: Especificidade da Espécie
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171031
[Lr] Data última revisão:
171031
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171014
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0186358


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[PMID]:28886133
[Au] Autor:Zhu Q; Liao BY; Li P; Li JC; Deng XM; Hu XS; Chen XY
[Ad] Endereço:Guangdong Key Laboratory for Innovative Development and Utilization of Forest Plant Germplasm, South China Agricultural University, Guangzhou, China.
[Ti] Título:Phylogeographic pattern suggests a general northeastward dispersal in the distribution of Machilus pauhoi in South China.
[So] Source:PLoS One;12(9):e0184456, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Machilus pauhoi Kanehira is an important timber species in China. A provenance trial was recently set up to evaluate the growth performance of trees from different localities, with the aim of designing seed transfer guidelines. Here, we tested twelve nuclear microsatellite markers derived from other species of the Lauraceae family and investigated population genetic structure in M. pauhoi. Both the number of observed alleles per locus (Na) and the polymorphic information content (PIC) significantly decreased against the latitude, but showed an insignificant decrease against the longitude. Heterozygosity (Ho) and gene diversity (h) exhibited a weak correlation with geographic location. Private alleles were present in multiple populations, and a moderate level of population genetic differentiation was detected (Gst = 0.1691). The joint pattern of genetic diversity (Na, PIC, Ho, and h) suggests that general northeastward dispersal led to the current distribution of M. pauhoi. Significant but weak effects of isolation-by-distance (IBD) occurred, implicating the mountain ranges as the major barrier to gene flow. Both STRUCTURE and hierarchical clustering analyses showed three distinct groups of populations related to the physical connectivity among mountain ranges. A priority in designing genetic conservation should be given to the populations at the southwest side of the species' distribution. This conservation strategy can also be combined with the pattern of adaptive genetic variation from the provenance trial for comprehensive genetic resource management of native M. pauhoi.
[Mh] Termos MeSH primário: Lauraceae/classificação
Lauraceae/genética
Filogenia
Filogeografia
[Mh] Termos MeSH secundário: Alelos
China
Meio Ambiente
Variação Genética
Genética Populacional
Geografia
Repetições de Microssatélites
Polimorfismo Genético
Dinâmica Populacional
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171018
[Lr] Data última revisão:
171018
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170909
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0184456


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[PMID]:28864277
[Au] Autor:Grecco SS; Costa-Silva TA; Jerz G; de Sousa FS; Londero VS; Galuppo MK; Lima ML; Neves BJ; Andrade CH; Tempone AG; Lago JHG
[Ad] Endereço:Center of Natural Sciences and Humanities, Federal University of ABC, Santo Andre, SP, 09210-180, Brazil; Institute of Food Chemistry, Technische Universität Braunschweig, Braunschweig, 38106, Germany; Biotechnology and Innovation in Health Program, Anhanguera University of São Paulo, São Paulo, SP,
[Ti] Título:Neolignans from leaves of Nectandra leucantha (Lauraceae) display in vitro antitrypanosomal activity via plasma membrane and mitochondrial damages.
[So] Source:Chem Biol Interact;277:55-61, 2017 Nov 01.
[Is] ISSN:1872-7786
[Cp] País de publicação:Ireland
[La] Idioma:eng
[Ab] Resumo:Chagas disease is a neglected tropical disease, caused by the protozoan parasite Trypanosoma cruzi, which affects more than eight million people in Tropical and Subtropical countries especially in Latin America. Current treatment is limited to nifurtimox and benznidazole, both with reduced effectiveness and high toxicity. In this work, the n-hexane extract from leaves of Nectandra leucantha (Lauraceae) displayed in vitro antitrypanosomal activity against T. cruzi. Using several chromatographic steps, four related neolignans were isolated and chemically characterized as dehydrodieugenol B (1), 1-(8-propenyl)-3-[3'-methoxy-1'-(8-propenyl)-phenoxy]-4,5-dimethoxybenzene (2), 1-[(7S)-hydroxy-8-propenyl]-3-[3'-methoxy-1'-(8'-propenyl)-phenoxy]-4-hydroxy-5-methoxybenzene (3), and 1-[(7S)-hydroxy-8-propenyl]-3-[3'-methoxy-1'-(8'-propenyl)-phenoxy]-4,5-dimethoxybenzene (4). These compounds were tested against intracellular amastigotes and extracellular trypomastigotes of T. cruzi and for mammalian cytotoxicity. Neolignan 4 showed the higher selectivity index (SI) against trypomastigotes (>5) and amastigotes (>13) of T. cruzi. The investigation of the mechanism of action demonstrated that neolignan 4 caused substantial alteration of the plasma membrane permeability, together with mitochondrial dysfunctions in trypomastigote forms. In silico studies of pharmacokinetics and toxicity (ADMET) properties predicted that all compounds were non-mutagenic, non-carcinogenic, non-genotoxic, weak hERG blockers, with acceptable volume of distribution (1.66-3.32 L/kg), and low rodent oral toxicity (LD 810-2200 mg/kg). Considering some clinical events of cerebral Chagas disease, the compounds also demonstrated favorable properties, such as blood-brain barrier penetration. Unfavorable properties were also predicted as high promiscuity for P450 isoforms, high plasma protein binding affinity (>91%), and moderate-to-low oral bioavailability. Finally, none of the isolated neolignans was predicted as interference compounds (PAINS). Considering the promising chemical and biological properties of the isolated neolignans, these compounds could be used as starting points to develop new lead compounds for Chagas disease.
[Mh] Termos MeSH primário: Antiparasitários/química
Antiparasitários/farmacologia
Lauraceae/química
Lignanas/química
Lignanas/farmacologia
Trypanosoma cruzi/efeitos dos fármacos
[Mh] Termos MeSH secundário: Animais
Antiparasitários/isolamento & purificação
Linhagem Celular
Membrana Celular/efeitos dos fármacos
Doença de Chagas/tratamento farmacológico
Seres Humanos
Lignanas/isolamento & purificação
Macaca mulatta
Potencial da Membrana Mitocondrial/efeitos dos fármacos
Folhas de Planta/química
Trypanosoma cruzi/metabolismo
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Antiparasitic Agents); 0 (Lignans)
[Em] Mês de entrada:1711
[Cu] Atualização por classe:171108
[Lr] Data última revisão:
171108
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170903
[St] Status:MEDLINE


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[PMID]:28478313
[Au] Autor:de Sousa FS; Grecco SS; Girola N; Azevedo RA; Figueiredo CR; Lago JHG
[Ad] Endereço:Institute of Environmental, Chemical and Pharmaceutical Sciences, Federal University of São Paulo, São Paulo, 09972-270, Brazil.
[Ti] Título:Neolignans isolated from Nectandra leucantha induce apoptosis in melanoma cells by disturbance in mitochondrial integrity and redox homeostasis.
[So] Source:Phytochemistry;140:108-117, 2017 Aug.
[Is] ISSN:1873-3700
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Six neolignans including three previously undescribed metabolites: 1-[(7R)-hydroxy-8-propenyl]-3-[3'-methoxy-1'-(8'-propenyl)-phenoxy]-4,5-dimethoxybenzene, 4-hydroxy-5-methoxy-3-[3'-methoxy-1'-(8'-propenyl)phenoxy]-1-(7-oxo-8-propenyl)benzene and 4,5-dimethoxy-3-[3'-methoxy-1'-(8'-propenyl)phenoxy]-1-(7-oxo-8-propenyl)benzene were isolated from twigs of Nectandra leucantha Nees & Mart (Lauraceae) using bioactivity-guided fractionation. Cytotoxic activity of isolated compounds was evaluated in vitro against cancer cell lines (SK BR-3, HCT, U87-MG, A2058, and B16F10), being dehydrodieugenol B and 4-hydroxy-5-methoxy-3-[3'-methoxy-1'-(8'-propenyl)phenoxy]-1-(7-oxo-8-propenyl)benzene the most active metabolites. These compounds displayed IC values of 78.8 ± 2.8 and 82.2 ± 3.5 µM, respectively, against murine melanoma. Different in vitro mechanism of induced cytotoxicity for this cell line is proposed for both compounds. Obtained results indicated a remarkable effect during the induction of morphological, biochemical and enzymatic features of apoptosis, such as disruption of mitochondrial membrane potential (ΔΨm), exposure of phosphatidylserine in the outer cell membrane, and genomic DNA condensation and fragmentation. Dehydrodieugenol B induced caspase-3 and PARP activation and 4-hydroxy-5-methoxy-3-[3'-methoxy-1'-(8'-propenyl)phenoxy]-1-(7-oxo-8-propenyl)benzene downregulated the levels of Bcl-2 protein. These effects were accompanied by increased levels of reactive oxygen species as a consequence of mitochondrial damage, followed by F-actin aggregation during the cell death process. Dehydrodieugenol B showed oxidative properties and both compounds, especially 4-hydroxy-5-methoxy-3-[3'-methoxy-1'-(8'-propenyl)phenoxy]-1-(7-oxo-8-propenyl)benzene, displayed potential to alkylate nucleophiles, suggesting an accessory mechanism of tumor-induced cytotoxicity by these metabolites.
[Mh] Termos MeSH primário: Antineoplásicos Fitogênicos/química
Apoptose
Lauraceae/química
Lignanas/química
Mitocôndrias/efeitos dos fármacos
[Mh] Termos MeSH secundário: Animais
Antineoplásicos Fitogênicos/isolamento & purificação
Linhagem Celular Tumoral
Seres Humanos
Lignanas/isolamento & purificação
Melanoma/patologia
Potencial da Membrana Mitocondrial
Camundongos
Estrutura Molecular
Oxirredução
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Antineoplastic Agents, Phytogenic); 0 (Lignans)
[Em] Mês de entrada:1707
[Cu] Atualização por classe:170717
[Lr] Data última revisão:
170717
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170508
[St] Status:MEDLINE


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[PMID]:28414813
[Au] Autor:Liu ZF; Ci XQ; Li L; Li HW; Conran JG; Li J
[Ad] Endereço:Plant Phylogenetics and Conservation Group, Center for Integrative Conservation, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Kunming, Yunnan, P. R. China.
[Ti] Título:DNA barcoding evaluation and implications for phylogenetic relationships in Lauraceae from China.
[So] Source:PLoS One;12(4):e0175788, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Lauraceae are an important component of tropical and subtropical forests and have major ecological and economic significance. Owing to lack of clear-cut morphological differences between genera and species, this family is an ideal case for testing the efficacy of DNA barcoding in the identification and discrimination of species and genera. In this study, we evaluated five widely recommended plant DNA barcode loci matK, rbcL, trnH-psbA, ITS2 and the entire ITS region for 409 individuals representing 133 species, 12 genera from China. We tested the ability of DNA barcoding to distinguish species and as an alternative tool for correcting species misidentification. We also used the rbcL+matK+trnH-psbA+ITS loci to investigate the phylogenetic relationships of the species examined. Among the gene regions and their combinations, ITS was the most efficient for identifying species (57.5%) and genera (70%). DNA barcoding also had a positive role for correcting species misidentification (10.8%). Furthermore, based on the results of the phylogenetic analyses, Chinese Lauraceae species formed three supported monophyletic clades, with the Cryptocarya group strongly supported (PP = 1.00, BS = 100%) and the clade including the Persea group, Laureae and Cinnamomum also receiving strong support (PP = 1.00, BS = 98%), whereas the Caryodaphnopsis-Neocinnamomum received only moderate support (PP = 1.00 and BS = 85%). This study indicates that molecular barcoding can assist in screening difficult to identify families like Lauraceae, detecting errors of species identification, as well as helping to reconstruct phylogenetic relationships. DNA barcoding can thus help with large-scale biodiversity inventories and rare species conservation by improving accuracy, as well as reducing time and costs associated with species identification.
[Mh] Termos MeSH primário: Código de Barras de DNA Taxonômico
DNA de Plantas/genética
Lauraceae/classificação
Lauraceae/genética
[Mh] Termos MeSH secundário: China
Filogenia
Especificidade da Espécie
[Pt] Tipo de publicação:EVALUATION STUDIES; JOURNAL ARTICLE
[Nm] Nome de substância:
0 (DNA, Plant)
[Em] Mês de entrada:1705
[Cu] Atualização por classe:170509
[Lr] Data última revisão:
170509
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170418
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0175788


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[PMID]:28216038
[Au] Autor:Chetia H; Kabiraj D; Singh D; Mosahari PV; Das S; Sharma P; Neog K; Sharma S; Jayaprakash P; Bora U
[Ad] Endereço:Bioengineering Research Laboratory, Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Assam 781039, India.
[Ti] Título:De novo transcriptome of the muga silkworm, Antheraea assamensis (Helfer).
[So] Source:Gene;611:54-65, 2017 May 05.
[Is] ISSN:1879-0038
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:Antheraea assamensis (Lepidoptera: Saturniidae), is a semi-domesticated silkworm known to be endemic to Assam and the adjoining hilly areas of Northeast India. It is the only producer of a unique, commercially important variety of golden silk called "muga silk". Herein, we report the de novo transcriptome of A. assamensis reared on Machilus bombycina leaves for the first time. Short reads generated by high throughput sequencing of cDNA libraries from multiple tissues, viz. alimentary canal, silk gland and residual body of the 5 instar of muga silkworm were assembled into transcripts via a de novo assembly pipeline followed by functional annotation and classification. A total of 1,21,433 transcripts were generated from ~231 million raw reads of which ~74% (89,583) were either allocated a functional annotation or categorized under Pfam/COG/KEGG categories. Identification of differentially expressed transcripts and their comparative sequence analysis revealed candidate genes related to silk synthesis, viz. silk gland factor-1 and 3, sericin-like transcript, etc. with conserved forkhead, homeo- and POU domains. Several candidate anti-microbial peptides which may have potential anti-bacterial, anti-fungal or anti-parasitic activity in A. assamensis were also identified. T/A and AT/TA were predicted to be the most abundant mono- and di-nucleotide simple sequence repeat markers in the transcriptome. Transcriptome validation was carried out by quantitative real-time PCR (qPCR) amplification of eight transcripts. The resources generated by this study will expand the periphery of existing genomic data on A. assamensis facilitating future in-depth studies on its unknown aspects.
[Mh] Termos MeSH primário: Perfilação da Expressão Gênica/métodos
Mariposas/genética
Seda/genética
Transcriptoma
[Mh] Termos MeSH secundário: Sequência de Aminoácidos
Animais
Biblioteca Gênica
Ontologia Genética
Genes de Insetos/genética
Sequenciamento de Nucleotídeos em Larga Escala/métodos
Proteínas de Insetos/genética
Larva/genética
Lauraceae/parasitologia
Anotação de Sequência Molecular
Folhas de Planta/parasitologia
Reação em Cadeia da Polimerase Via Transcriptase Reversa
Análise de Sequência de DNA/métodos
Homologia de Sequência de Aminoácidos
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Insect Proteins); 0 (Silk)
[Em] Mês de entrada:1704
[Cu] Atualização por classe:170411
[Lr] Data última revisão:
170411
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170221
[St] Status:MEDLINE


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[PMID]:28160863
[Au] Autor:Grecco SS; Costa-Silva TA; Jerz G; de Sousa FS; Alves Conserva GA; Mesquita JT; Galuppo MK; Tempone AG; Neves BJ; Andrade CH; Cunha RL; Uemi M; Sartorelli P; Lago JH
[Ad] Endereço:Center of Natural Sciences and Humanities, Federal University of ABC, Santo Andre, São Paulo 09210-180, Brazil; Institute of Food Chemistry, Technische Universität Braunschweig, Braunschweig, 38106, Germany.
[Ti] Título:Antitrypanosomal activity and evaluation of the mechanism of action of dehydrodieugenol isolated from Nectandra leucantha (Lauraceae) and its methylated derivative against Trypanosoma cruzi.
[So] Source:Phytomedicine;24:62-67, 2017 Jan 15.
[Is] ISSN:1618-095X
[Cp] País de publicação:Germany
[La] Idioma:eng
[Ab] Resumo:BACKGROUND: From a previous screening of Brazilian biodiversity for antiprotozoal activity, the hexane extract from leaves of Nectandra leucantha (Nees & Mart.) (Lauraceae) demonstrated activity against Trypanosoma cruzi. Chromatographic separation of this extract afforded bioactive dehydrodieugenol (1). Furthermore, methylated derivative 2 (dehydrodieugenol dimethyl ether) was prepared and also tested against T. cruzi. PURPOSE: To examine the therapeutical potential of compounds 1 and 2 against T. cruzi as well as to elucidate the mechanism of action of bioactive compound 1 against T. cruzi. METHODS/STUDY DESIGN: Crude hexane extract from leaves was subjected to chromatographic steps to afford bioactive compound 1. In order to analyze the effect of additional methyl group in the antiparasitic activity of 1, derivative 2 was prepared (both are no pan-assay interference compounds - PAINS). These compounds were evaluated in vitro against T. cruzi (trypomastigote and amastigote forms) and analyzed for the potential effect in host cells through the production of nitric oxide and reactive oxygen species. Finally, the plasma membrane effect of the most potent compound 1 was investigated in T. cruzi trypomastigotes. RESULTS: Compounds 1 and 2 displayed activity against amastigotes of T. cruzi. Although both compounds promoted activity against intracellular amastigotes, the production of nitric oxide and reactive oxygen species of host cells were unaltered, suggesting an antiparasitic activity other than host cell activation. Considering 1 the most effective compound against T. cruzi, the interference in the plasma membrane of the trypomastigotes was investigated using the fluorescent probe SYTOX Green. After a short-term incubation, the fluidity and integrity of the plasma membrane was completely altered, suggesting it as a primary target for compound 1 in T. cruzi. CONCLUSION: Compounds 1 and 2 selectively eliminated the intracellular parasites without host cell activation and could be important scaffolds for the search of new hit compounds.
[Mh] Termos MeSH primário: Antiprotozoários/uso terapêutico
Doença de Chagas/tratamento farmacológico
Eugenol/uso terapêutico
Lauraceae/química
Extratos Vegetais/uso terapêutico
Trypanosoma cruzi/efeitos dos fármacos
[Mh] Termos MeSH secundário: Animais
Antiprotozoários/farmacologia
Brasil
Fitoterapia
Extratos Vegetais/farmacologia
Folhas de Planta/química
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Antiprotozoal Agents); 0 (Plant Extracts); 3T8H1794QW (Eugenol)
[Em] Mês de entrada:1704
[Cu] Atualização por classe:170817
[Lr] Data última revisão:
170817
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170206
[St] Status:MEDLINE


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[PMID]:28143663
[Au] Autor:Simon AG; Mills DK; Furton KG
[Ad] Endereço:International Forensic Research Institute, Florida International University, 11200 SW 8th St, Miami, FL, 33199 USA; Department of Chemistry and Biochemistry, Florida International University, 11200 SW 8th St, Miami, FL, 33199 USA.
[Ti] Título:Chemotyping the temporal volatile organic compounds of an invasive fungus to the United States, Raffaelea lauricola.
[So] Source:J Chromatogr A;1487:72-76, 2017 Mar 03.
[Is] ISSN:1873-3778
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:Volatile organic compounds (VOCs) in the headspace of the fungus Raffaelea lauricola have been monitored and identified over a twenty-eight day growth period. R. lauricola is an invasive and phytopathogenic fungus that was first identified in the United States in the mid-2000s. It is believed to be spread by a host beetle, Xyleborus glabratus, and is detrimental both to wild members of the Lauraceae family and to commercial avocado groves particularly in the Southeastern region of the country. The fungus causes the fatal laurel wilt disease, a result of the host tree shutting down its vascular system in order to halt the spread of the fungus. The current study identified the VOCs present in the headspace of R. lauricola over the initial growth stage using headspace solid phase microextracion-gas chromatography-mass spectrometry (HS-SPME-GC-MS). Results revealed the VOC dynamics of the fungus in culture, indicating that the initial growth period of the fungus may coincide with potential responses from the host trees that may recognize and respond to the pathogen when the fungal VOCs are produced as a result of primary metabolic processes. As fungal growth progresses past initial growth phases, the predominant compounds seen in the odor profile are hydrocarbons and terpenes, produced from secondary metabolic processes. The odor profile pattern for the twenty-eight day growth period did change with the stages of growth. Based on the information learned from this pilot study, a discussion is presented of possible host tree reactions to R. lauricola and implications for future experiments.
[Mh] Termos MeSH primário: Ophiostomatales/química
Compostos Orgânicos Voláteis/análise
Compostos Orgânicos Voláteis/química
[Mh] Termos MeSH secundário: Animais
Cromatografia Gasosa-Espectrometria de Massas
Hidrocarbonetos/análise
Lauraceae/microbiologia
Persea/microbiologia
Projetos Piloto
Microextração em Fase Sólida
Terpenos/análise
Fatores de Tempo
Árvores/microbiologia
Estados Unidos
Gorgulhos/microbiologia
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Hydrocarbons); 0 (Terpenes); 0 (Volatile Organic Compounds)
[Em] Mês de entrada:1704
[Cu] Atualização por classe:170414
[Lr] Data última revisão:
170414
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170202
[St] Status:MEDLINE


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[PMID]:28102496
[Au] Autor:Devi G; Devi A; Bhattacharyya KG
[Ad] Endereço:Environmental Chemistry Laboratory, Life Sciences Division (LSD), Institute of Advanced Study in Science and Technology (IASST), Paschim Boragaon, Guwahati, Assam, 781 035, India.
[Ti] Título:Oil exploration activities: assessment of hazardous impacts on 'Golden silk' cultivation.
[So] Source:Environ Monit Assess;189(2):62, 2017 Feb.
[Is] ISSN:1573-2959
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:Aliphatic-aromatic hydrocarbons and heavy metals (Cd, Cu, Co, Cr, Ni, Pb and Zn) were estimated in soil and leaf samples of Machilus bombycina (host plant of Antheraea assama silkworm) plantation along with atmospheric benzene, toluene and xylene (BTX) concentration near the oil exploration region of upper Assam, India, during the pre-monsoon and post-monsoon periods in six different sites. The results revealed higher aliphatic-aromatic hydrocarbons (ranging from 26.55 to 59.42 mg kg ) and heavy metal contaminations in all the six soil sampling sites during the pre-monsoon period while the trend was the opposite for the plant leaves. Polyaromatic hydrocarbons (9.85 mg kg ) were found in one soil sampling site near an abandoned oil well. The lead concentration in the soil showed values from 14.36 ± 1.5 to 96.5 ± 5.6 mg kg and found to be higher than the WHO limit in most of the samples. The aliphatic-aromatic hydrocarbon m-xylene was also found in M. bombycina plant leaves which could be traced due to crude oil. Cd and Pb concentrations in leave samples were found to be higher than the maximum allowable limit of 0.3 and 5.3 mg kg , respectively. Principal component analysis of hydrocarbons in soil and leaves showed different clusters during the pre-monsoon and post-monsoon periods. The crude protein and total carbohydrate contents in the leaves were lower than those of uncontaminated samples which are an indication of a major disturbance to overall growth of plants. BTX concentration was found in the range of 119-198 µg m which indicates that atmospheric contamination in the studied area is causing the death of A. assama larvae.
[Mh] Termos MeSH primário: Indústrias Extrativas e de Processamento
Lauraceae/química
Poluição por Petróleo
Seda
Poluentes do Solo/análise
[Mh] Termos MeSH secundário: Animais
Bombyx
Monitoramento Ambiental/métodos
Hidrocarbonetos/análise
Índia
Chumbo/análise
Metais Pesados/análise
Campos de Petróleo e Gás
Petróleo/análise
Plantas/metabolismo
Solo/química
Xilenos/análise
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Hydrocarbons); 0 (Metals, Heavy); 0 (Petroleum); 0 (Silk); 0 (Soil); 0 (Soil Pollutants); 0 (Xylenes); 2P299V784P (Lead); O9XS864HTE (3-xylene)
[Em] Mês de entrada:1702
[Cu] Atualização por classe:171116
[Lr] Data última revisão:
171116
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170120
[St] Status:MEDLINE
[do] DOI:10.1007/s10661-017-5769-x



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