Search Results - "Barbosa, Luiz Cláudio de Almeida"
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Phytotoxic effects of metabolites from Alternaria euphorbiicola against its host plant Euphorbia heterophylla
Published in Química Nova (2013)“…A bioassay-guided fractionation of culture filtrates of the fungus Alternaria euphorbiicola, a pathogen of the weed Euphorbia heterophylla, led to the…”
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QSAR modeling of photosynthesis-inhibiting nostoclide derivatives
Published in Pest management science (01-02-2010)“…BACKGROUND: A statistical model, built using the CODESSA software package, was developed to describe the relationship between the structure of nostoclide…”
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Harvest time on the content and chemical composition of essential oil from leaves of guava
Published in Ciência rural (01-10-2016)“…The essential oil plants contents can be affected by several factors. For example, in certain plants, collection time has been observed to affect the content…”
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Synthesis of New Phytogrowth-Inhibitory Substituted Aryl-p-Benzoquinones
Published in Chemistry & biodiversity (01-05-2006)“…Reaction of [(2‐alkyloxy)methyl]‐1,4‐dimethoxybenzene 10 (alkyl=butyl, hexyl, decyl, tridecyl, tetradecyl, hexadecyl, and octadecyl) with ceric ammonium…”
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Plant compounds insecticide activity against Coleoptera pests of stored products
Published in Pesquisa agropecuaria brasileira (01-07-2007)“…The objective of this work was to screen plants with insecticide activity, in order to isolate, identify and assess the bioactivity of insecticide compounds…”
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A comparative study on the crystal structure of bicycle analogues to the natural phytotoxin helminthosporins
Published in Journal of molecular structure (05-02-2016)“…Herein we described structural insights of a series of analogues to helminthosporin phytotoxins. The key reaction used to prepare the compounds corresponded to…”
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Síntese e avaliação da atividade antimalárica de novos ozonídeos
Published in Eclética química (01-05-2018)“…A reação de cicloadição [3+4] entre diferentes dienos (ciclopentadieno, 2-metilfurano e furano) e halocetonas levou aos cicloadutos correspondentes, cuja…”
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Chemical characterization by GC-MS and phytotoxic potential of non-polar and polar fractions of seeds of Dioteryx odorata (Aubl.) Willd. from Venezuelan regions
Published in Química Nova (2013)“…Dipteryx odorata (Aubl.) Willd. is a tall arboreal species native to Central and Northern South America. This paper describes the chemical characterization and…”
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Constituintes químicos da casca de Ochroma lagopus swartz (Bombacaceae)
Published in Eclética química (01-05-2018)“…O estudo químico das cascas de Ochroma lagopus Swartz levou ao isolamento e ou, identificação de uma mistura de ácidos graxos e triacilglicerídeos, de…”
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Composição e fungitoxicidade do óleo essencial de capim citronela em função da adubação orgânica
Published in Pesquisa agropecuaria brasileira (01-12-2012)“…O objetivo deste trabalho foi avaliar a influência da adubação orgânica sobre o teor e a composição do óleo essencial de capim citronela (Cymbopogon nardus),…”
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Variação química do óleo essencial de Hyptis suaveolens (L.) Poit., sob condições de cultivo
Published in Química Nova (01-12-2006)“…This study was performed to establish the correlation between the growth conditions and essential oil composition of Hyptis suaveolens from Alfenas (MG),…”
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Preparation and phytotoxicity of sorgoleone analogues
Published in Química nova (01-12-2001)“…3,5-Dimethoxybenzylic alcohol was converted into the 2-acetoxy-5-methoxy-3-(pent-1-yl)-1,4-benzoquinone (12), in seven steps, with an overall yield of 14.6%…”
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Influência do processo de secagem sobre os principais componentes químicos do óleo essencial de tomilho
Published in Revista Ceres (01-10-2012)“…Objetivou-se, com este trabalho, avaliar o efeito da temperatura do ar de secagem sobre a qualidade do óleo essencial de folhas de tomilho. Foram empregadas…”
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Síntese de novos herbicidas derivados do 1,2alfa,4alfa,5-tetrametil-8-oxabiciclo[3.2.1]oct-6-en-3-ona
Published in Química Nova (01-04-2004)Get full text
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Síntese e avaliação da atividade fitotóxica de novos análogos oxigenados do ácido helmintospórico
Published in Química Nova (01-10-2003)Get full text
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Discrimination between workers of Acromyrmex subterraneus molestans from monogynous and polygynous colonies
Published in Brazilian archives of biology and technology (01-03-2006)“…Behavioral assays were conducted with individuals from monogynous and polygynous colonies of Acromyrmex subterraneus molestans to evaluate the discriminatory…”
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Síntese e avaliação da atividade fitotóxica de lactonas derivadas do 2,4-dimetil-8-oxabiciclo[3.2.1]-oct-6-en-3-ona
Published in Química nova (01-05-2002)“…The alkene 2,4-dimethyl-8-oxabicyclo[3.2.1]-oct-6-en-3-one (3) was converted to 1,3,10-trimethyl-8-oxabicyclo[5.3.0]-dec-3-ene-2,9-dione (7) and…”
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Teor e composição do óleo essencial de cinco acessos de mentrasto
Published in Química nova (01-02-2004)“…This study aimed to analyse the content and the composition of the essential oil of five accesses of mentrasto (Ageratum conyzoides). Five accesses of…”
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Metodologia de extração e determinaçao do teor de extrativos em madeiras de eucalipto
Published in Revista árvore (01-12-2006)“…Neste trabalho foi avaliado o teor de extrativos em madeiras de eucalipto, por meio de extrações com acetona, mistura de tolueno:etanol (2:1), clorofórmio e…”
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