Papers by João Gomes da Costa
Lingua, 2010
Children are known to have problems in understanding Wh-movement constructions in which the objec... more Children are known to have problems in understanding Wh-movement constructions in which the object moves across an overt subject (as is the case in object relatives, Wh-object questions, and topicalization). To test whether crossing dependencies are also problematic when no Wh-movement is involved and whether dependencies in which the subject crosses an object are also difficult, we test a construction that has not been studied before, a coordination sentence like The girl kissed the boy and went to the beach. This structure includes a dependency-between the empty subject of went to the beach and the girl. This dependency crosses the object the boy. We tested the comprehension of this construction in comparison with coordination that does not involve a dependency, and with coordination that includes a dependency without intervention. We also compared it with relative clauses with and without intervention, object relatives and subject relatives, respectively. We ran five experiments to assess the comprehension of these structures and the correlation between them. Experiments 1 and 2 tested sentence-picture matching in 49 3;4 to 5;5 year old Hebrew-and European-Portuguese-speaking children; Experiments 3 and 4 used comprehension questions in 41 3;6 to 5;6 year old Hebrew-and European-Portuguesespeaking children. Experiment 5 tested the correlations between the structures in 69 schoolage children. The main findings were that children performed poorly on the comprehension of sentences containing crossing dependency coordination, in all 5 experiments, and in both languages. Their difficulty in the crossing dependency coordination was similar to their difficulty with object relatives, and their performance on crossing dependency coordination correlated with that of object relatives. Their performance on coordination without dependency, coordination with a dependency but without crossing, and subject relatives was good. We conclude that crossing dependencies, not only in Wh-movement dependencies, underlie the difficulty in young children's sentence comprehension.
As Regiões Semiáridas e suas Especificidades, 2019
Regiões áridas-Brasil. I. Zuffo, Alan Mario. II. Série. CDD 333.7369 Elaborado por Maurício Amorm... more Regiões áridas-Brasil. I. Zuffo, Alan Mario. II. Série. CDD 333.7369 Elaborado por Maurício Amormino Júnior-CRB6/2422 O conteúdo dos artigos e seus dados em sua forma, correção e confiabilidade são de responsabilidade exclusiva dos autores. 2019 Permitido o download da obra e o compartilhamento desde que sejam atribuídos créditos aos autores, mas sem a possibilidade de alterá-la de nenhuma forma ou utilizá-la para fins comerciais. www.atenaeditora.com.br APRESENTAÇÃO A obra "As Regiões Semiáridas e suas Especificidades" aborda uma série de livros de publicação da Atena Editora, em seu I volume, apresenta, em seus 24 capítulos, com conhecimentos tecnológicos das regiões semiáridas e suas especificidades. As Ciências estão globalizadas, englobam, atualmente, diversos campos em termos de pesquisas tecnológicas. O semiárido brasileiro tem característica peculiares, alimentares, culturais, edafoclimáticas, étnicos, entre outros. Tais, diversidades culminam no avanço tecnológico, nas áreas de Agronomia, Engenharia Florestal,
Meio Ambiente, Sustentabilidade e Agroecologia 6, 2019
Elaborado por Maurício Amormino Júnior-CRB6/2422 O conteúdo dos artigos e seus dados em sua forma... more Elaborado por Maurício Amormino Júnior-CRB6/2422 O conteúdo dos artigos e seus dados em sua forma, correção e confiabilidade são de responsabilidade exclusiva dos autores. 2019 Permitido o download da obra e o compartilhamento desde que sejam atribuídos créditos aos autores, mas sem a possibilidade de alterá-la de nenhuma forma ou utilizá-la para fins comerciais.
Diversitas Journal, 2021
Phytochemical investigation, phenol content and allelopathic potential of Croton heliotropiifoliu... more Phytochemical investigation, phenol content and allelopathic potential of Croton heliotropiifolius Kunth extract Investigação fitoquímica, conteúdo de fenol e potencial alelopático do extrato de Croton heliotropiifolius Kunth Chryslane Barbosa da Silva (1) ; Kelly Barbosa da Silva (2) ; Antônio Euzébio Goulart Santana (3) ; Aldenir Feitosa dos Santos (4) ; João Gomes da Costa (5) ; Ligia Sampaio Reis (6)
Revista Principia - Divulgação Científica e Tecnológica do IFPB, 2020
The edaphic mesofauna comprises litter-decomposing organisms deposited on the surface that direct... more The edaphic mesofauna comprises litter-decomposing organisms deposited on the surface that directly participate in the process of nutrient cycling and the formation of organic matter, essential to maintain soil quality. The aim of this research was to quantify the abundance, richness and diversity of the edaphic mesofauna in caatinga environments in the semiarid region of Alagoas. For this research, two areas of native caatinga were selected, located in Olho D’Água do Casado (area I) and Delmiro Gouveia (area II), in the state of Alagoas, whose areas of vegetation are characterized as hypoxophilous caatinga. The collections were conducted bimonthly between February 2012 and October 2013. For the collection of mesofauna, twenty pre-selected points were used, from which samples of soil + litter were taken, with the aid of metal rings, 5 cm soil depth. The samples were taken to the battery of extractors Berlese-Tullgren, which was modified for the extraction of the organisms, and later...
Diversitas Journal, 2018
Todo o conteúdo expresso neste artigo é de inteira responsabilidade dos seus autores.
Acta Brasiliensis, 2020
This study quantifies phenolic and flavonoid compounds and evaluates the antioxidant activity by ... more This study quantifies phenolic and flavonoid compounds and evaluates the antioxidant activity by the DPPH (2,2-diphenyl-1-picrylhydrazyl) method, also identifying some secondary metabolites of R. sativus under organic fertilization and water stress. For this, a greenhouse experiment was carried out with the preparation of plant extracts (leaves and roots), quantification of phenolic and flavonoid compounds, analysis of antioxidant activity, and phytochemical screening. Different classes of secondary metabolites (catechins, steroids, saponins, among others) were identified. The DPPH method showed that the leaf extract has higher DPPH radical scavenging activity. The leaf extract had a high content of phenolic compounds, especially in treatments without water stress, either with organic fertilization (1925.59 mg GAE/g extract) or with mineral fertilization (2058.47 mg GAE/g extract). For root extracts, R. sativus developed under water stress and organic fertilization showed higher phe...
Summa Phytopathologica, 2019
Bioscience Journal, 2019
The mangrove forest is an important transitional ecosystem consisted of terrestrial and marine en... more The mangrove forest is an important transitional ecosystem consisted of terrestrial and marine environment located in tropical and subtropical regions with average temperatures above 20 °C. In Alagoas, the mangrove forests are found on the entire coastline from Maragogi to Piaçabuçu. In the last 20 years, due to the pollution of water resources, studies of coastal aquatic ecosystems have been developed. The objective of this study was to analyze the physicochemical properties and determine the levels of heavy metals in mangrove sediments of the Mundaú-Manguaba estuary lagoon complex (MMELC) and Meirim River in Alagoas. Zinc, copper, lead, cadmium and chromium were chosen due to their relationship with sewer, agricultural, and industrial wastes. 22 soil samples were collected in the MMELC and in the Meirim River. The samples were submitted to soil routine analyses of Embrapa. The heavy metals were extracted by the Mehlich-1 method and analyzed by atomic absorption spectrometry. The mean concentrations of these metals in the sediment samples followed the order Mn > Zn >Pb > Cr> Cu >Cd in MMELC and Zn > Mn >Pb > Cr> Cu >Cd in Meirim River. All proposed heavy metals were found in sediments, however, the cadmium levels were above the normal levels proposed by Environment National Council (CONAMA) and Canadian Council of Ministers of the Environment. The study shows that the analysis of sediment can contribute to environmental monitoring actions and development of public policies aimed to controlling the sustainable use of natural resources of the studied areas.
Diversitas Journal, 2019
Os alimentos líquidos da dieta são considerados causas potenciais para erosão dental. Para a cara... more Os alimentos líquidos da dieta são considerados causas potenciais para erosão dental. Para a caracterização do potencial erosivo de bebidas, torna-se relevante analisar suas propriedades físico-químicas, como a mensuração do pH, da capacidade tamponante e do teor de sólidos solúveis totais. O objetivo do estudo in vitro foi conhecer o potencial erosivo de bebidas de fruta industrializadas e naturais, amplamente consumidas no Brasil. Foi realizada análise das características físico-químicas, comparando seus valores de pH, CT e teor de SST. Os parâmetros foram observados à temperatura ambiente (±23°C) e refrigeradas (±6°C). Foram selecionadas 9 bebidas de 3 sabores (maracujá, uva e morango) divididas em 3 grupos: bebida industrializada, bebida de polpa de fruta e bebida da fruta in natura, totalizando 18 amostras analisadas. Todas as bebidas apresentaram pH ácido abaixo do crítico para a dissolução do esmalte (<5,5), independente da temperatura (2,74-3,43). Os parâmetros pH e CT nã...
Pesquisa Brasileira em Odontopediatria e Clínica Integrada, 2019
Objective: To evaluate the influence of gustatory stimuli on the buffering capacity of saliva. Ma... more Objective: To evaluate the influence of gustatory stimuli on the buffering capacity of saliva. Material and Methods: The buccal ph of 18 male volunteers aged 18-35 years was measured after a mouthwash with 20 ml of water as a control, and in individual disposable cups they collected the saliva for two minutes. Then, each of chewed bubble gum with sugar for two minutes, discarding the gum and made new collection of saliva, for two minutes in other disposable cups individualized. After collection, each volunteer was again subject to regular brushing with toothpaste and waited another ten minutes. The same procedure was repeated with all other substances. Salivary buffer capacity was determined by Ericsson technique. Data were submitted to analysis of variance and the means were compared by the Scott-Knott grouping test and Mann-Whitney test at 5% probability. Estimates of Pearson correlations were calculated in order to determine possible associations between the variables. Results: It was not found statistically significant differences between the initial pH variation and after eating food (p>0.05), or between gustatory stimulation and variation of salivary buffer capacity (p>0.05). Conclusion: There is no influence of gustatory stimulus aroma and flavor on the variation of salivary buffer capacity.
Journal of Chemical Ecology, 2011
The cotton aphid, Aphis gossypii (Homoptera: Aphididae), is increasing in importance as a pest wo... more The cotton aphid, Aphis gossypii (Homoptera: Aphididae), is increasing in importance as a pest worldwide since the introduction of Bt-cotton, which controls lepidopteran but not homopteran pests. The chemical ecology of interactions between cotton, Gossypium hirsutum (Malvaceae), A. gossypii, and the predatory lacewing Chrysoperla lucasina (Neuroptera: Chrysopidae), was investigated with a view to providing new pest management strategies. Behavioral tests using a four-arm (Pettersson) olfactometer showed that alate A. gossypii spent significantly more time in the presence of odor from uninfested cotton seedlings compared to clean air, but significantly less time in the presence of odor from A. gossypii infested plants. A. gossypii also spent significantly more time in the presence of headspace samples of volatile organic compounds (VOCs) obtained from uninfested cotton seedlings, but significantly less time with those from A. gossypii infested plants. VOCs from uninfested and A. gossypii infested cotton seedlings were analyzed by gas chromatography (GC) and coupled GC-mass spectrometry (GC-MS), leading to the identification of (Z)-3-hexenyl acetate, (E)-4,8-dimethyl-1,3,7-nonatriene (DMNT), methyl salicylate, and (E,E)-4,8,12-trimethyl-1,3,7,11-tridecatetraene (TMTT), which were produced in larger amounts from A. gossypii infested plants compared to uninfested plants. In behavioral tests, A. gossypii spent significantly more time in the control (solvent) arms when presented with a synthetic blend of these four compounds, with and without the presence of VOCs from uninfested cotton. Coupled GC-electroantennogram (EAG) recordings with the lacewing C. lucasina showed significant antennal responses to VOCs from A. gossypii infested cotton, suggesting they have a role in indirect defense and indicating a likely behavioral role for these compounds for the predator as well as the aphid.
Industrial Crops and Products, 2012
Water deficit is among the main environmental factors limiting agricultural productivity of sugar... more Water deficit is among the main environmental factors limiting agricultural productivity of sugarcane in Northeast Brazil by affecting virtually every aspect of plant growth, with consequent reduction of the agro-industrial productivity of this crop. This study aimed to use path analysis to evaluate the physiological components of sugarcane under two water conditions, with photosynthesis as the basic variable, in order to obtain subsidies that can help the genetic breeding of this crop by selection of superior clones with drought tolerance. The experiment was carried out in a greenhouse with a completely randomized experimental design, 4 × 2 factorial arrangements (four sugarcane genotypes × two soil moisture regimes: control, with 80-100% available water and stressed, with 0-20% water available) and with four replications. Each plot consisted of one pot with 12 kg of substrate containing one plant. Treatments were maintained at a humidity close to field capacity with daily replacement of the evapotranspired water with a water supply for 66 days of cultivation for treatments under stress. Evaluations were conducted on the fourth day after severe water stress at 70 days of cultivation. Data from nine physiological variables were considered, with six of these being used in the model after exclusion of those that were contributing to multicollinearity. Variables used in path analysis were enough to explain the variation found in photosynthesis under both water conditions. Stomatal conductance, transpiration and the SPAD index should be considered as a priority in breeding programs for sugarcane aiming to get more productive and tolerant genotypes to water stress, and selection indexes should be used with due consideration of these variables to promote gains in photosynthesis.
Euphytica, 2010
The aim of this study was to demonstrate that Capsicum spp. cultivars are differentially preferre... more The aim of this study was to demonstrate that Capsicum spp. cultivars are differentially preferred by the cotton aphid, Aphis gossypii, and to investigate the role of volatile semiochemicals in conferring differences in host preferences. Two preference assays were conducted in 2008 under greenhouse conditions. Fourteen different commercially available cultivars were grown in cages protected by an anti-aphid net, and were infested 60 days after planting, through the release of ten adult female A. gossypii per plant. The results showed that after a five-day infestation period, statistically significant differences in the mean number of A. gossypii between cultivars were observed, with Sweet Pepper Hybrid Green Belt (SPHGB) being one of the cultivars with the lowest number of A. gossypii per plant. To test the hypothesis that the preference of cultivars was associated with release of volatile, Capsicum spp-derived semiochemicals, olfactometer behavior bioassays were conducted with A. gossypii, using volatile organic compounds (VOCs) collected from non-preferred SPHGB and preferred SPAB cultivars. A. gossypii was significantly repelled only by the VOCs of infested SPHGB. Furthermore, coupled gas chromatography-mass spectrometry (GC-MS) analysis of VOCs released by plants prior to, and after, A. gossypii infestation, revealed that the non-preferred SPHGB cultivar released nine additional compounds after infestation, including 6-methyl-5-hepten-2-one, a known plant defense semiochemical involved in plant-aphid interactions. These data suggest that non-preferred cultivars releasing this semiochemical have the potential to be used in breeding programs aimed at producing A. gossypii-resistant Capsicum spp. cultivars.
Combinatorial Chemistry & High Throughput Screening, 2013
The present study aims to determine the antioxidant capacity of the ethanolic extracts of husk fi... more The present study aims to determine the antioxidant capacity of the ethanolic extracts of husk fiber of four coconut (Cocos nucifera L.) varieties (yellow dwarf, green dwarf, giant and hybrid) and to evaluate the electrochemical behavior of these extracts on a glassy carbon electrode and on a modified glassy carbon electrode. The highest values of total phenolic content were obtained for the hybrid (531 ± 24 mg GAE g-1 dry extract) and yellow dwarf (501 ± 29 mg GAE g-1 dry extract) varieties and the lowest was for the green dwarf variety with 58 ± 9 mg GAE g-1 dry extract. The ability of the extracts to scavenge DPPH • radicals was in the order of giant > yellow dwarf > hybrid > green dwarf and the IC 50 values varied from 8.6 to 55.9 g mL-1. All varieties showed reducing potential by the use of FRAP and CUPRAC methods, with the lowest performance obtained for the green dwarf variety. Additionally, through the use of mimetic biomembranes, ethanolic extracts of coconut husk were shown to protect lipids against oxidative damage independent of the variety. The main antioxidants identified in the extract of yellow dwarf variety by UPLC-MS were quercetin and catechin. Cyclic voltammetric studies of the ethanolic extracts on glassy carbon electrode confirmed the presence of easily oxidized compounds, and the high antioxidant capacity of the varieties. This capacity was expressed as mg quercetin equivalents g-1 dry extract and ranged from 25.9 up to 53.5 mg QE g-1. A poly-xanthurenic acid (poly-Xa)/ multi-walled carbon nanotube (MWCNT) / glassy carbon modified electrode (poly-Xa/MWCNT/GCE) was used for this purpose. Our findings suggest that these extracts are potentially important antioxidant supplements for the everyday human diet, pharmaceutical and cosmetic industries, thereby aggregating value to the enormous amount of waste from the coconut industry, mostly used for burning purposes.
O controle de pragas das especies vegetais cultivadas tem sido normalmente realizado por meio de ... more O controle de pragas das especies vegetais cultivadas tem sido normalmente realizado por meio de inseticidas, o que e indesejavel tanto por motivos economicos quanto ambientais, ja que as aplicacoes sucessivas afetam os inimigos naturais e aumentam a possibilidade de desenvolvimento de populacoes da praga resistentes aos inseticidas. Esses problemas podem ser minimizados com metodos alternativos de controle como o emprego de variedades resistentes, o uso de substâncias indutoras e o controle biologico. Para isso, estudos envolvendo a interacao planta, praga e inimigo natural sao de fundamental importância. Dessa forma, este trabalho teve como objetivos: a) Estudar a acao dos compostos orgânicos volateis na interacao tritrofica entre o pimentao Capsicum spp., o pulgao Aphis gossypiie seu parasitoide Aphidiuscolemani; b) Estudar a acao da cis-jasmona na interacao tritrofica entre o pimentao, o pulgao A. gossypii e o parasitoide A. colemani e seu papel na ativacao do mecanismo de defes...
British Medical Journal
To evaluate the clinical benefit of lipid lowering drug treatment in patients with and without di... more To evaluate the clinical benefit of lipid lowering drug treatment in patients with and without diabetes mellitus, for primary and secondary prevention. Systematic review and meta-analysis. Cochrane, Medline, Embase, and reference lists up to April 2004. Randomised, placebo controlled, double blind trials with a follow-up of at least three years that evaluated lipid lowering drug treatment in patients with and without diabetes mellitus. Two independent reviewers extracted data. The primary outcome was major coronary events defined as coronary heart disease death, non-fatal myocardial infarction, or myocardial revascularisation procedures. Twelve studies were included. Lipid lowering drug treatment was found to be at least as effective in diabetic patients as in non-diabetic patients. In primary prevention, the risk reduction for major coronary events was 21% (95% confidence interval 11% to 30%; P &amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;lt; 0.0001) in diabetic patients and 23% (12% to 33%; P = 0.0003) in non-diabetic patients. In secondary prevention, the corresponding risk reductions were 21% (10% to 31%; P = 0.0005) and 23% (19% to 26%; P &amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;lt; or = 0.00001). However, the absolute risk difference was three times higher in secondary prevention. When results were adjusted for baseline risk, diabetic patients benefited more in both primary and secondary prevention. Blood lipids were reduced to a similar degree in both groups. The evidence that lipid lowering drug treatment (especially statins) significantly reduce cardiovascular risk in diabetic and non-diabetic patients is strong and suggests that diabetic patients benefit more, in both primary and secondary prevention. Future research should define the threshold for treatment of these patients and the desired target lipid concentrations, especially for primary prevention.
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Papers by João Gomes da Costa