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Search Results: 1 - 10 of 9633 matches for " Adolfo Henrique;Guilhon "
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Essential oil composition of Croton palanostigma Klotzsch from north Brazil
Brasil, Davi do Socorro B.;Muller, Adolfo Henrique;Guilhon, Giselle Maria S. P.;Alves, Cláudio Nahum;Andrade, Eloísa Helena A.;Silva, Joyce Kelly R. da;Maia, José G. S.;
Journal of the Brazilian Chemical Society , 2009, DOI: 10.1590/S0103-50532009000600026
Abstract: the essential oils of leaves, twigs, branches, trunk bark and fruits of croton palanostigma were analyzed by gc and gc-ms. the main compounds found in the oil of the leaves were linalool (25.4%), (e)-caryophyllene (21.0%), methyleugenol (17.2%) and β-elemene (6.0%); in the oil of the twigs were α-pinene (41.4%), limonene (29.0%), sabinene (11.5%) and β-pinene (5.7%); in the oil of the branches were methyleugenol (24.1%), (e)-methylisoeugenol (15.3%), α-pinene (11.2%) and (e)-caryophyllene (8.5%); in the oil of the trunk bark were a-pinene (31.6%), methyleugenol (25.6%) and (e)-methylisoeugenol (23.7%); and in the oil of the fruits were linalool (42.7%), methyleugenol (16.3%) and β-elemene (6.4%). statistical analysis showed that the leaves and fruit, and the branches and trunk bark, have significant similarities between them. in addition, the trunk bark oil has high brine shrimp larvicidal activity (lc50, 3.71 ± 0.01 mg ml-1).
Avalia o do crescimento e da produtividade da mamoneira BRS 149 Nordestina em dois níveis tecnológicos
Valdere Martins dos Santos,Henrique Guilhon de Castro,Dione Pereira Cardoso,Saulo de Oliveira Lima
Journal of Biotechnology and Biodiversity , 2011,
Abstract: This study aimed to evaluate the growth and yield of castor bean cultivar Northeastern in environments oflow tech and high technological level. The design was randomized blocks in factorial scheme, with fiverepetitions. The treatments consisted of two levels of technology and five sampling times. In the lowtechnological level, fertilization was not used and crop irrigation and sowing was done in pits. In thehigh technological level, we performed a chemical fertilization, liming the soil, plowing, disking, plantingin furrows and conventional sprinkler irrigation. Characteristics were evaluated plant height, stemdiameter, leaf area, fresh leaf and stem dry mass of leaf and stem, leaf area ratio, leaf area index andproductivity. There were significant differences between the levels of technology in all traits. In the lowtechnological level the absence of fertilization at planting and lack of irrigation during the period ofconducting the experiment, hindered the development of plants. With respect to productivity, the hightechnological level showed higher productivity, 3.794 kg ha-1. In the low technological level, the yieldwas 1.683 kg ha-1.
Avalia??o do teor e composi??o do óleo essencial de Cymbopogon nardus (L.) em diferentes épocas de colheita
Castro, Henrique Guilhon de;Perini, Vilma Borges de Moura;Santos, Gil Rodrigues dos;Leal, Tarcísio Castro Alves Barros;
Revista Ciência Agron?mica , 2010, DOI: 10.1590/S1806-66902010000200020
Abstract: this study aimed to analyze the content and the composition of the essential oil of cymbopogon nardus in five harvest times in tocantins state. five harvesting were carried out in regular space of 28 days, the first in 56 days and the last in 168 days after transplanting. the essential oil was obtained by hydro distillation and the identification of the oil components by gc and gc/ms. the highest contents of the essential oil were obtained in the second harvest time (1.15%) and in the last harvest time (1.07%). twenty three chemical compounds were identified in the essential oil. the monoterpenes identified were: limonene, linalool, isopulegol, citronellal, citronellol, neral, geraniol, citronellol acetate and geraniol acetate. the sesquiterpenes identified were: beta-elemene, germacrene, alpha-muurolene, gamma-cadinene, delta-cadinene, elemol, germacrene d-4-ol, caryophyllene oxide, tau-cadinol, beta-eudesmol, alpha-eudesmol. the main constituents of the essential oil were the citronellol, geraniol and elemol.
Effect of essential oils of medicinal plants on leaf blotch in Tanzania grass Efeito de óleos essenciais de plantas medicinais sobre a helmintosporiose do capim Tanzania
Gil Rodrigues dos Santos,Rúbia Borges Cruz Sarmento Brum,Henrique Guilhon de Castro,Clebson Gomes Gon?alves
Revista Ciência Agron?mica , 2013,
Abstract: Leaf spots caused by phyto-pathogenic fungi, can reduce the production of forage plants. The essential oils of medicinal plants have antimicrobial potential. The objective here was to evaluate the fungotoxicity in vitro of the essential oils of lemongrass (Cymbopogon citratus (DC.) Stapf (Poaceae)), citronella (Cymbopogon nardus (L.) Rendle (Poaceae)), lemon balm (Lippia alba (Mill.) NE Br ex Britton & P. Wilson (Verbenaceae)) and peppermint (Mentha piperita L. (Lamiaceae)) on the fungus Helminthosporium sp. and the in vivo effect of these oils and of commercial neem oil (Azadirachta indica A. Juss. (Meliaceae)) on leaf blotch in Panicum maximum Jacq. cv. Tanzania-1. The mycelial growth of the fungus was evaluated over five periods (2; 4; 6; 8 and 10 days from incubation) and with five concentrations of essential oils (C1 = 250 ppm; C2 = 500 ppm; C3 = 750 ppm; C4 = 1,000 ppm e C5 = 1,250 ppm). As an alternative control, the preventative and curative effect on leaf blotch of five oil-based treatments were evaluated: lemongrass, citronella, lemon balm, peppermint and neem in four concentrations (2,500; 5,000; 7,500 and 10,000 ppm). The essential oils of lemongrass and citronella were the most effective in reducing mycelial growth of Helminthosporium sp. With the essential oil of lemongrass, the pathogen presented the highest growth concentration (1.250 ppm). The results obtained showed that all the essential oils and concentrations tested presented a preventive and curative effect, reducing the severity of leaf blotch. Manchas foliares, causadas por fungos fitopatogênicos, podem reduzir a produ o de forrageiras. óleos essenciais de plantas medicinais apresentam potencial antimicrobiano. Objetivou-se avaliar a fungitoxicidade in vitro dos óleos essenciais de capim-lim o (Cymbopogon citratus (DC.) Stapf (Poaceae)), citronela (Cymbopogon nardus (L.) Rendle (Poaceae)), erva-cidreira (Lippia alba (Mill.) N.E. Br. ex Britton & P. Wilson (Verbenaceae)) e hortel -pimenta (Mentha piperita L. (Lamiaceae)) sobre o fungo Helminthosporium sp. e o efeito in vivo desses óleos e do óleo comercial de nim (Azadirachta indica A. Juss. (Meliaceae)) sobre a helmintosporiose de Panicum maximum Jacq. cv. Tanzania-1. Foi avaliado, em cinco períodos (dois, quatro, seis, oito e dez dias de incuba o), o crescimento micelial do fungo sob cinco concentra es dos óleos essenciais (C1 = 250 ppm; C2 = 500 ppm; C3 = 750 ppm; C4 = 1000 ppm e C5 = 1250 ppm). Como controle alternativo, foi avaliado o efeito preventivo e curativo sobre a helmintosporiose de cinco tratamentos à base de óleo
Teor e composi o do óleo essencial de cinco acessos de mentrasto
Castro Henrique Guilhon de,Oliveira Luiz Orlando de,Barbosa Luiz Cláudio de Almeida,Ferreira Francisco Affonso
Química Nova , 2004,
Abstract: This study aimed to analyse the content and the composition of the essential oil of five accesses of mentrasto (Ageratum conyzoides). Five accesses of mentrasto with three repetitions were used. The accesses were obtained in Mariana-MG (AMA), Piranga-MG (API), Visconde do Rio Branco (ARB) and Vi osa-MG (AVB and AVP). The essential oil was obtained by hydrodistillation and the identification of the oil components by CG and GC/MS. The ARB access presented the higher essential oil content, that is 0.70% (P < 0.05). Eleven chemical compounds were identified. The precocene I was the main constituent in the access API, and the precocene II was the main constituent in the accesses AMA, ARB, AVB and AVP.
Biomass yield and essential oil from three chemotypes (I, II and III) and four accessions of lemongrass [Lippia alba (Mill.) N. E. Brown] in the southern State of Tocantins
Jo?o Josué Batista Neto,Tarcisio Castro de Barros Leal,Melquezedeque do Vale Nunes,Henrique Guilhon de Castro
Journal of Biotechnology and Biodiversity , 2012,
Abstract: This study aimed to evaluate the production of essential oil from three chemotypes for experiment 1 and four accessions of L. alba from different municipalities in southern Tocantins for experiment 2, with these three repetitions, the design of randomized blocks. The essential oil was obtained via hydrodistillation in Clevenger apparatus. Were evaluated: dry weight, content and yield of essential oil per plant. In experiment 1 there was no statistically significant difference in any of the variables analyzed. In the second experiment, there was significant difference between treatments in Gurupi / Cariri in relation to access to Figueirópolis / Alvorada with regard to oil content, which did not differ on the characteristics analyzed for dry mass, when analyzed if the yield per plant was a significant difference between the fits of Gurupi and Cariri in relation to access to Figueirópolis and Alvorada.
Avalia o do efeito curativo e preventivo do óleo essencial do capim citronela no controle de Pyricularia grisea
Vilma Borges de Moura Perini,Henrique Guilhon de Castro,Gil Rodrigues dos Santos,Raimundo Wagner de Souza Aguiar
Journal of Biotechnology and Biodiversity , 2011,
Abstract: The rice blast is the most important disease of the rice, due to the damage that it causes in the productivity and grain quality. Aiming at the use of essential oils and plant extracts to control this disease. The objective of this study was to evaluate the curative and preventive effect of the extracts and essential oil of citronella grass (Cymbopogon nardus L.) to control rice blast. The evaluation of the curative effect was performed seven days after the spraying with the extracts of citronella grass. As for the evaluation of preventive effect, the plants were sprayed with the treatments and 24 hours after inoculated with 20 mL of the spore solution per tray. In the assessing of the curative effect, it was found that the application of fungicide and the diluted essential oil of citronella grass at a concentration of 2% plants showed no symptoms of blast in 50% of the repetitions. Regarding the evaluation of preventive effect, the plants showed no symptoms of the disease in concentrations of 1.5, 1.75 and 2% of the essential oil of citronella grass in 50% of the repetitions.
Crestamento gomoso do caule da melancia: Etiologia, epidemiologia e medidas de controle
Gil Rodrigues dos Santos,Evelynne Urzêdo Le?o,Henrique Guilhon de Castro,Ildon Rodrigues do Nascimento
Journal of Biotechnology and Biodiversity , 2011,
Abstract: The stem gummy blight (Didymella bryoniae) is one of the most important fungal diseases of the crop of the watermelon, because it causes damping off of the seedlings, lesions on leaves and cotyledons, and formation of cankers on stems and stalks. The fungus survives in the absence of the host on or beneath the soil, in sick crop residues, in other cultivated curcubitáceas, weeds or seeds. To control the disease is recommended the adoption of integrated management techniques, including cultural practices, chemical control and genetic control with the use of tolerant and / or resistant genotypes and other measures. This review aims to address the information to organize knowledge obtained in national and international literature on the gummy stem blight in watermelon crop. We tried to relate the aspects of etiology, epidemiology and controlling measures of D. bryoniae. It was noted that after several studies had been conducted so far, you must search for further information about the biology of the pathogen and the management of the disease in the field.
Isolation, X-ray crystal structure and theoretical calculations of the new compound 8-Eepicordatin and identification of others terpenes and steroids from the bark and leaves of Croton palanostigma Klotzsch
Brasil, Davi S. B.;Müller, Adolfo H.;Guilhon, Gisele M. S. P.;Alves, Cláudio N.;Peris, Gabriel;Llusar, Rosa;Moliner, Vicent;
Journal of the Brazilian Chemical Society , 2010, DOI: 10.1590/S0103-50532010000400021
Abstract: phytochemical studies of the bark and leaves of croton palanostigma klotzsch (euphorbiaceae) led to the isolation of a new clerodane diterpene, 8-epicordatin (2), in addition to 12-oxohardwickiic acid methyl ester (3), aparisthman, cordatin (1), ent-trachyloban-18-oic acid, ent-13-epimanoyl oxide, ent-3-oxo-13-epimanoyl oxide, ent-3β-hydroxy-13-epimanoyl oxide, sitosterol, stigmasterol, stigmastan-3-one, 6β-hydroxystigmast-4-en-3-one, 6β-hydroxystigmasta-4,22-dien-3-one, stigmast-4-en-3-one, stigmasta-4,22-dien-3-one, 3-o-acetylaleuritolic acid, 11α-hydroxyurs-12-en-3-one, α-amyrenone, 24-methylenecycloartenone and lupenone. these compounds were isolated using typical phytochemical procedures and the structures were deduced from spectroscopic studies, including 2d nmr experiments. in addition, the crystalline structure of 8-epicordatin (2) was determined by x-ray diffraction. nmr theoretical calculations at the b3pw91/dgdzvp level were used to confirm the assignment of the chemical shifts of the h-7α and h-7β hydrogens of 8-epicordatin.
Ensino superior privado: expans?o das cooperativas de m?o de obra docente
Calderón, Adolfo Ignacio;Louren?o, Henrique da Silva;
Cadernos de Pesquisa , 2011, DOI: 10.1590/S0100-15742011000200015
Abstract: the present article deals with the outsourcing of professors of private higher education through labor cooperatives. this educational phenomenon appeared in the middle of the decade. the matter was considered an illegal practice violating cooperative principles and defrauding labor laws. the objective of the article is to understand the expansion of this phenomenon, supported by a chronological reconstruction of the facts, the identification of historical moments aiming to provide a legal framework based on concrete cases involving the labor justice and the public ministry. qualitative research allowed the identification of four moments: since the appearance of the first cases, until the punishments of the higher education institutions who adopted this contractual system.
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