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ABSTRACT Introduction: Surface treatment is an important technique to increase adhesion between implants and bones, improving its mechanical characteristics and consequently the patient’s comfort. Objectives: Ni-Cr alloys were the object of study in this work, with the purpose of analyzing and evaluating the effect of thin films deposition of titanium nitride via plasma, on its surface and comparing with cathodic cage (CC) and hollow cathode (HC) methods, for dental applications. Methods: Eighteen samples were prepared and the experiment was conducted in two steps: the pre-sputtering (1h, 350 °C, gases: Ar and H) and sputtering (4h, 450 °C, gases: Ar, Ni, and H). To characterize and compare the samples with those of reference, the Scanning Electron Microscopy (SEM), X-Ray Diffraction (XRD), Vickers Microhardness and wettability tests were used. Results: The results presented by SEM showed that during the surface treatment using CC, voids were formed, and using HC, the samples showed a more homogenous behavior. In microhardness tests, using a 25gf load, it was possible to observe that the HC method allowed an increase of 87% when compared to the reference and treated samples. Significance: Lastly, it can be concluded that both methods are suitable for Ni-Cr alloy surface treatment, and the HC technique, a method already used by dental professionals, presents better results due to the formation of a thicker film layer.

https://doi.org/10.1590/1517-7076-rmat-2022-0257

COVID-19 outcomes in people living with HIV: Peering through the waves
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Sales, Thaís Lorenna Souza

; Souza-Silva, Maíra Viana Rego

; Delfino-Pereira, Polianna

; Neves, João Victor Baroni

; Sacioto, Manuela Furtado

; Assis, Vivian Costa Morais de

; Duani, Helena

; Oliveira, Neimy Ramos de

; Sampaio, Natália da Cunha Severino

; Ramos, Lucas Emanuel Ferreira

; Schwarzbold, Alexandre Vargas

; Jorge, Alzira de Oliveira

; Scotton, Ana Luiza Bahia Alves

; Castro, Bruno Mateus de

; Silva, Carla Thais Cândida Alves da

; Ramos, Carolina Marques

; Anschau, Fernando

; Botoni, Fernando Antonio

; Grizende, Genna Maira Santos

; Nascimento, Guilherme Fagundes

; Ruschel, Karen Brasil

; Menezes, Luanna Silva Monteiro

; Castro, Luís César de

; Nasi, Luiz Antônio

; Carneiro, Marcelo

; Godoy, Mariana Frizzo de

; Nogueira, Matheus Carvalho Alves

; Guimarães Júnior, Milton Henriques

; Ziegelmann, Patricia Klarmann

; Almeida, Rafaela Charão de

; Francisco, Saionara Cristina

; Silveira Neto, Sidney Teodoro

; Araújo, Silvia Ferreira

; Avelino-Silva, Thiago Junqueira

; Aliberti, Márlon Juliano Romero

; Pires, Magda Carvalho

; Silva, Eduardo Sérgio da

; Marcolino, Milena Soriano

Clinics

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2023, Volume 78 elocation 100223

Abstract: En | Text: En | PDF: En

Abstract Objective To evaluate clinical characteristics and outcomes of COVID-19 patients infected with HIV, and to compare with a paired sample without HIV infection. Methods This is a substudy of a Brazilian multicentric cohort that comprised two periods (2020 and 2021). Data was obtained through the retrospective review of medical records. Primary outcomes were admission to the intensive care unit, invasive mechanical ventilation, and death. Patients with HIV and controls were matched for age, sex, number of comorbidities, and hospital of origin using the technique of propensity score matching (up to 4:1). They were compared using the Chi-Square or Fisher's Exact tests for categorical variables and the Wilcoxon for numerical variables. Results Throughout the study, 17,101 COVID-19 patients were hospitalized, and 130 (0.76%) of those were infected with HIV. The median age was 54 (IQR: 43.0;64.0) years in 2020 and 53 (IQR: 46.0;63.5) years in 2021, with a predominance of females in both periods. People Living with HIV (PLHIV) and their controls showed similar prevalence for admission to the ICU and invasive mechanical ventilation requirement in the two periods, with no significant differences. In 2020, in-hospital mortality was higher in the PLHIV compared to the controls (27.9% vs. 17.7%; p = 0.049), but there was no difference in mortality between groups in 2021 (25.0% vs. 25.1%; p > 0.999). Conclusions Our results reiterate that PLHIV were at higher risk of COVID-19 mortality in the early stages of the pandemic, however, this finding did not sustain in 2021, when the mortality rate is similar to the control group.

https://doi.org/10.1016/j.clinsp.2023.100223

Uso de álcool, conflitos familiares e supervisão parental entre estudantes do ensino médio
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Neves, João Victor Viana da Silva

; Carvalho, Lucas Almeida de

; Carvalho, Mateus Almeida de

; Silva, Érica Thaís Costa

; Alves, Maria Luiza Terra Santos

; Silveira, Marise Fagundes

; Silva, Rosângela Ramos Veloso

; Almeida, Maria Tereza Carvalho

Ciência & Saúde Coletiva

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oct 2021, Volume 26 N. 10 Pages 4761 - 4768

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

Resumo Investigou-se a associação entre o consumo de álcool pelos escolares com os conflitos familiares, supervisão dos pais e qualidade dos relacionamentos. Estudo transversal realizado com 1.265 adolescentes de 21 escolas. Foi utilizada a versão brasileira do Inventário de Triagem do Uso de Drogas/DUSI e estimadas prevalências absolutas e relativas para variáveis categóricas, e conduzidas análises bivariadas: teste Qui Quadrado de Pearson. Para magnitude da associação entre a variável dependente e independentes foram estimadas razões de prevalências por meio deregressão multivariável de Poisson. Houve associação do consumo de álcool com uso de drogas por familiares, discussões frequentes e desconhecimento dos pais sobre o que os adolescentes fazem. Supervisão familiar, bom relacionamento com pais/responsáveis, estabelecimento de vínculo familiar afetivo e ciência dos pais acerca do que os adolescentes fazem e onde estão, foram fatores de proteção para uso de álcool. Concluiu-se que a alta taxa de escolares que consomem álcool é preocupante, passível de complicações da saúde na sua integralidade, sendo fundamental relação familiar harmonizada. A implementação de práticas interventivas entre escola e Estratégia de Saúde da Família, podem contribuir no estabelecimento de vínculo protetivo.

Abstract The association between alcohol consumption by students with family conflicts, parental supervision and quality of relationships was investigated. A cross-sectional study was conducted with 1,265 adolescents from 21 schools. The Brazilian version of the Drug Use Screening Inventory/DUSI was used, and absolute and relative prevalence for categorical variables was estimated, while bivariate analyses and Pearson’s Chi Square test were conducted. For the magnitude of the association between the dependent and independent variables, prevalence ratios were estimated using Poisson multivariate regression. There was an association between alcohol consumption and drug use by family members, frequent discussions and parental lack of awareness about adolescents’ activities. Family supervision, a good relationship with parents/guardians, establishing an affective family bond and parents’ knowledge about teenagers’ whereabouts, were protective factors for alcohol use. The conclusion was that the high rate of schoolchildren who consume alcohol is worrying, liable to health complications in general, and a harmonized family relationship is fundamental. The implementation of measures of intervention between school and the Family Health Strategy, can contribute to the establishment of a protective bond.

https://doi.org/10.1590/1413-812320212610.22392020 118 downloads

Uso de álcool, conflitos familiares e supervisão parental entre estudantes do ensino médio
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Neves, João Victor Viana da Silva

; Carvalho, Lucas Almeida de

; Carvalho, Mateus Almeida de

; Silva, Érica Thaís Costa

; Alves, Maria Luiza Terra Santos

; Silveira, Marise Fagundes

; Silva, Rosângela Ramos Veloso

; Almeida, Maria Tereza Carvalho

Ciência & Saúde Coletiva

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2021, Volume 26 N. 10 Pages 4761 - 4768

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

https://doi.org/10.1590/1413-812320212610.22392020

Influence of Pre-Heating Regular Resin Composites and Flowable Composites on Luting Ceramic Veneers with Different Thicknesses
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Tomaselli, Lucas de Oliveira

; Oliveira, Dayane Carvalho Ramos Salles de

; Favarão, Jamille

; Silva, Ariel Farias da

; Pires-de-Souza, Fernanda de Carvalho Panzeri

; Geraldeli, Saulo

; Sinhoreti, Mário Alexandre Coelho

Brazilian Dental Journal

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oct 2019, Volume 30 N. 5 Pages 459 - 466

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

Resumo O objetivo neste estudo foi avaliar a influência do pré-aquecimento, conteúdo de carga e espessura da cerâmica na espessura da película, resistência de união ao microcisalhamento, grau de conversão e alteração de cor na cimentação de cerâmicas. Dois compósitos experimentais foram preparados (Bis-GMA / UDMA / BisEMA / TEGDMA), com diferentes quantidades de carga (65% ou 50% em peso), simulando um compósito convencional e um fluido. O fluido (F) foi usado à temperatura ambiente e o convencional, à temperatura ambiente (C) ou pré-aquecido (CPH). Foram preparados discos de cerâmica com diferentes espessuras (0,4mm, 0,8mm, 1,5mm). A espessura da película foi avaliada de acordo com a ISO 4049 (n=10). A resistência de união ao microcisalhamento (n=10) foi avaliada em esmalte utilizando espécimes fotopolimerizados através da cerâmica. O grau de conversão foi avaliado usando espectroscopia Raman. A alteração de cor das restaurações cerâmicas (n=10) foi avaliada por espectrofotometria. Os resultados foram submetidos à ANOVA 2- fatores e ao teste post hoc de Tukey (a=5%). Para espessura de película foi utilizada a ANOVA 1-fator (a=5%). O grupo C apresentou maior espessura de película; o CPH produziu uma espessura semelhante ao F. Todos os compósitos mostraram resistência de união ao microcisalhamento similares. O grau de conversão do F foi maior que C e CPH. O grau de conversão dos compósitos fotoativados através 0,4 mm foi maior que dos compósitos fotoativados através de cerâmicas mais espessas. O grupo C apresentou a maior mudança de cor, enquanto o CPH apresentou mudança de cor semelhante ao F. Em conclusão, compósitos convencionais pré-aquecidos assim como compósitos fluídos, parecem ser uma alternativa em potencial para cimentar laminados cerâmicos.

Abstract The aim of this study was to evaluate of pre-heating, filler contents and ceramic thickness on film thickness, microshear bond strength, degree of conversion and color change on ceramic veneers. Two experimental composites were prepared (Bis-GMA/UDMA/BisEMA/ TEGDMA), with different amounts of filler (65% or 50%wt) simulating a conventional and a flowable composite. The flowable (F) was used at room temperature and, the conventional either at room temperature (C) or pre-heated (CPH). Disk-shaped ceramics with different thickness (0.4 mm, 0.8 mm, 1.5 mm) were prepared. The film thickness was evaluated according to the ISO 4049 (n=10). The microshear bond strength (n=10) was evaluated in enamel using tubing specimens light-cured through the ceramic veneer. The degree of conversion was evaluated using Raman spectroscopy. The color change of the ceramic restorations (n=10) was evaluated by spectrophotometry. The results were submitted to 2-way ANOVA and Tukey’s post hoc test (a=5%). For the film thickness 1-way ANOVA was used (a=5%). The C presented the thicker film thickness; the CPH produced a similar film thickness in comparison to the F. All composites showed similar microshear bond strength. The degree of conversion of the F was higher than the C and CPH. The degree of conversion of the composites photo-activated through a 0.4 mm was higher than the composites photo-activated through thicker ceramics. The C showed the highest color change, while the CPH showed similar color change to the F. In conclusion, pre-heated conventional composites seem to be a potential alternative to lute ceramic veneers such as the flowable composites.

https://doi.org/10.1590/0103-6440201902513 3502 downloads

Florestas estacionais e áreas de ecótono no estado do Tocantins, Brasil: parâmetros estruturais, classificação das fitofisionomias florestais e subsídios para conservação
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Haidar, Ricardo Flores

; Fagg, Jeanine Maria Felfili

; Pinto, José Roberto Rodrigues

; Dias, Ricardo Ribeiro

; Damasco, Gabriel

; Silva, Lucas de Carvalho Ramos

; Fagg, Christopher William

Acta Amazonica

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sep 2013, Volume 43 N. 3 Pages 261 - 290

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

O objetivo deste estudo foi descrever a riqueza, estrutura e diversidade de espécies arbóreas em áreas de Floresta Estacional e ecótono (Floresta Estacional/Floresta Ombrófila) no estado do Tocantins, buscando subsídios para a conservação, manejo florestal, compensação de reserva legal e recuperação ambiental, além de discutir as identidades fitogeográficas em comparação com outras florestas do Brasil. Em 18 bacias hidrográficas, conduziu-se amostragem da vegetação arbórea (DAP > 5 cm) de 22 áreas (amostras) por meio do inventário de 477 parcelas de 400 m². Foram elaboradas análises de classificação pelo método TWINSPAN, em duas escalas distintas. A primeira avaliou a diversidade beta entre as parcelas amostradas no estado do Tocantins e a segunda buscou analisar a similaridade das florestas do Tocantins em relação a outras florestas do bioma Cerrado e suas áreas de tensão ecológica. As florestas amostradas apresentaram ampla variação em termos de riqueza (33 a 243 espécies), densidade (486 a 1.179 ind.ha-1), área basal (14,04 e 37,49 m².ha-1), índices de diversidade (H´ = 2,75 a 4,59) e de equabilidade (J´= 0,72 a 0,86). As análises de classificação convergiram para resultados comuns, identificando quatro ambientes dissimilares em termos florísticos e estruturais no estado do Tocantins: Floresta Estacional Decidual, Floresta Estacional Semidecidual, ecótono Floresta Estacional Semidecidual/Floresta Ombrófila e ecótono Floresta Estacional Decidual/Floresta Ombrófila. A fim de manter a diversidade de plantas e de ambientes na região de transição Floresta Amazônica e Cerrado, sugere-se que o processo de criação de unidades de conservação no estado do Tocantins deva ser intensificado e tenha como base para seleção das áreas critérios biogeográficos.

The purpose of this study was to describe the richness, structure and diversity of tree species occurring in seasonally dry forests and some ecotone areas (Seasonal Forest/Ombrophilous Forest) in the state of Tocantins (Brazil). We aimed to provide information for conservation, management, environmental compensation and restoration strategies, and discuss their phytogeography identities in relation to other Brazilian forests. We selected 22 areas in 18 hydrogeographic basins and performed an inventory of all trees species (DHB > 5 cm) occurring in 477 plots of 400 m². We conducted a classification analysis of the vegetation using the TWINSPAN method in two different scales. The first assessed the beta diversity among plots within the state of Tocantins, and the second analysed similarities between these forests and other forests ecosystems in the Cerrado ecoregion and related ecotones in Central Brazil. A wide variation of species richness (33 to 243 species), density (486 to 1179 trees.ha-1), basal area (14.04 to 37.49 m². ha-1), diversity indexes (H’ = 2.75 to 4.59) and evenness (J’ = 0.72 to 0.86) across the sites was found. Based on floristic and structural aspects, classification analyses identified four major forests types: Seasonal Deciduous Forest, Seasonal Semi-deciduous Forest, and two ecotones Seasonal Semideciduous Forest/Ombrophilous Forest and ecotone Seasonal Deciduous Forest / Ombrophilous Forest. In order to maintain plant and habitat diversity in the Amazon/Cerrado transition zone, the creation of conservation areas should be intensified using biogeographical patterns as site selection criteria.

https://doi.org/10.1590/S0044-59672013000300003 18084 downloads Cited 2 times in SciELO

A simple procedure for the purification of active fractions in aqueous extracts of plants with allelopathic properties
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Borghetti, Fabian

; Lima, Elisa Coutinho de

; Silva, Lucas de Carvalho Ramos

Acta Botanica Brasilica

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mar 2013, Volume 27 N. 1 Pages 50 - 53

Abstract: En | Text: En | PDF: En

Most studies conducted to test the allelopathic activity of plant parts have made use of water as solvent. However, the presence of polar, water-soluble substances, such as proteins and carbohydrates, tends to hamper the purification of active compounds. In this study, we present a simple purification procedure that separates the active fraction of the extract from the undesirable substances, thus facilitating the search for active molecules through standard chromatographic methods. Aqueous leaf extracts of three Cerrado species (Caryocar brasiliense, Qualea parviflora and Eugenia dysenterica) were prepared at 5% concentration (w/v) and stored at 4ºC (crude extracts). After 24 h, these solutions were filtered and freeze-dried. The powder obtained was dissolved in methanol, filtered again, evaporated and dissolved in water for bioassays (purified extracts). For the bioassays, seedlings of Sesamum indicum were grown for five days in aqueous solutions prepared from crude and purified extracts at concentrations ranging from 0.1% to 1.0% (w/v). Seedling growth in distilled water was set as a control. In comparison with the control, we found that test solutions prepared from both crude and purified extracts significantly inhibited sesame seedling growth. However, solutions prepared from purified extracts were two to ten times more inhibitory to seedling growth than were those prepared from crude extracts. The inhibition of root growth ranged from 35% to 77%, depending on the plant species, at a concentration as low as 0.1%. Roots were more affected than were shoots. The effects of purified extracts on seedling morphology were similar to those observed when crude extracts were employed, indicating that the procedure of purification of crude extracts did not interfere with the mode of action of the active substances

https://doi.org/10.1590/S0102-33062013000100007 8505 downloads

Características funcionais de folhas de sol e sombra de espécies arbóreas em uma mata de galeria no Distrito Federal, Brasil
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Rossatto, Davi Rodrigo

; Takahashi, Frederico Scherr Caldeira

; Silva, Lucas de Carvalho Ramos

; Franco, Augusto César

Acta Botanica Brasilica

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sep 2010, Volume 24 N. 3 Pages 640 - 647

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

As matas de galeria são formações florestais que ocupam cerca de 10% da área dos cerrados e representam 1/3 da diversidade de espécies arbóreas ali encontradas. Estudos recentes têm demonstrado a importância dessas florestas em regiões do Brasil central, mas pouco se sabe sobre a fisiologia e plasticidade de espécies de mata de galeria em relação a variantes ambientais, como a irradiação solar. No presente estudo, foram comparados in situ aspectos fisiológicos e nutricionais de folhas de sol e sombra, em dez espécies arbóreas comumente encontradas em matas de galeria. Folhas de sol apresentaram maiores valores de assimilação de CO2 em base de área (Aarea), condutância estomática (gs), rendimento quântico do fotossistema II (ΦFSII) e uma maior fração de centros de reação abertos (qL), enquanto folhas de sombra apresentaram uma maior área foliar específica. Diferenças não foram encontradas para potencial hídrico foliar, assimilação de CO2 em base de massa e para a concentração foliar de macronutrientes. Dos atributos foliares analisados, a abertura estomática e o rendimento quântico do fotossistema II foram os principais fatores atuantes na Aarea em folhas de sol, enquanto em folhas de sombra apenas ΦFSII foi influente. As diferenças encontradas demonstram que, assim como em outras formações florestais, em mata de galeria as espécies arbóreas possuem a capacidade de se aclimatarem às condições contrastantes de sombreamento que ocorrem neste tipo de ambiente.

Gallery forest is a forest formation that covers about 10% of the cerrado biome and represents about 1/3 of cerrado tree diversity in Brazil. Recent studies demonstrate the importance of gallery forest in central regions of Brazil, but little is known about the physiology and plasticity of gallery forest species in relation to environmental variability, particularly in terms of light availability. In this study we compared in situ physiological and nutritional aspects of shade and sun leaves, in ten tree species commonly found in gallery forests. Relative to shade leaves, sun leaves had higher values of CO2 assimilation rates on an area basis (Aarea), of stomatal conductance (gs), of quantum yield of Photosystem II (ΦPSIIL); and a larger fraction of PSII centers in the open state (qL), while shade leaves showed higher specific leaf area. However, shade and sun leaves did not differ in terms of leaf water potential, CO2 assimilation on a mass basis and in leaf concentrations of macronutrients. ΦPSII and gs were the main factors that influenced Aarea in sun leaves, while only ΦPSII significantly affected Aarea of shade leaves. The differences found here demonstrate that, like in other forest formations worldwide, gallery forest trees are able to acclimate to contrasting irradiance levels that typically occur in this type of environment.

14832 downloads Cited 8 times in SciELO

Caracterização da polpa do coquinho-azedo (Butia capitata var capitata)
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Faria, Juliana Pereira

; Almeida, Fernanda

; Silva, Lucas Carvalho Ramos da

; Vieira, Roberto Fontes

; Agostini-Costa, Tânia da Silveira

Revista Brasileira de Fruticultura

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sep 2008, Volume 30 N. 3 Pages 827 - 829

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

O objetivo deste trabalho foi determinar a composição química, o teor de vitamina C, o valor pró-vitamina A e o teor de compostos fenólicos totais na polpa do coquinho-azedo (Butia capitata var capitata). Umidade, lipídeos, cinzas e fibras foram determinados por métodos gravimétricos; os minerais foram determinados por espectrometria de emissão atômica com fonte de plasma indutivo; o valor pró-vitamina A foi calculado através do teor de carotenóides; a vitamina C foi determinada por titulação com diclorofenolindofenol; os compostos fenólicos foram determinados pelo método de Folin-Ciocalteou, empregando ácido gálico e ácido tânico como padrões, e pelo método da vanilina, empregando catequina como padrão. A polpa, se comparada com outras frutas normalmente consumidas, apresentou elevado teor de óleo (2,5%), de fibra dietética (7,0%), de pró-vitamina A (146, 2RAE 100g-1), de vitamina C (53mg 100g-1), de compostos fenólicos (210mg de catequina, equivalente 100g-1; 116mg de ácido tânico, equivalente 100g-1) e de potássio (516mg 100g-1). O coquinho-azedo apresentou elevado potencial para enriquecer a alimentação da população local, especialmente como fonte de fibras, pró-vitamina A, vitamina C e potássio, a exemplo do que já vem sendo feito na merenda escolar no norte de Minas Gerais. Estes resultados demonstram o elevado valor de produtos oferecidos pelos pequenos agricultores, respaldando a importância cultural da espécie e valorizando a manutenção da variabilidade no cerrado.

The aim of this work was to measure the chemical composition and the vitamin A, vitamin C and total phenolics compounds of 'coquinho-azedo' pulp (Butia capitata var capitata). The moisture, lipids, ash and fiber contents were determined by gravimetric methods; the mineral profile was characterized by inductively coupled plasma spectrophotometer; the pro-vitamin A value was calculate through carotenoids measure; the vitamin C content was determined by dichlorophenolindophenol method; phenolic compounds were determined by Folin-Ciocalteou method, using gallic acid and tannic acid as standards, and by vanillin method, using catechin as standard. The 'coquinho-azedo' pulp, if compared with other fruits normally consumed, presented high content of oil (2,5%), dietetic fiber (7,0%), pro-vitamin A (146,2 RAE 100g-1), vitamin C (53mg 100g-1), phenolic compounds (210mg of catechin equivalent 100g-1 of pulp, by vanillin method; 116mg of tannic acid equivalent 100g-1 of pulp, by Folin-Ciocalteou method) and potassium (516mg 100g¹). The 'coquinho-azedo' presented high potential to enrich the food of local population, especially as a source of fiber, pro-vitamin A, vitamin C and potassium, as an example that has been happening in the meals for school children at the North of the state of Minas Gerais. These results show the high value of products supplied by small farmers, presenting the cultural importance of the Butia capitata var capitata and valuing the maintenance of the variability.

6975 downloads Cited 7 times in SciELO

10.

Sobrevivência e crescimento de seis espécies arbóreas submetidas a quatro tratamentos em área minerada no cerrado
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Silva, Lucas de Carvalho Ramos

; Corrêa, Rodrigo Studart

Revista Árvore

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aug 2008, Volume 32 N. 4 Pages 731 - 740

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

Entre as várias atividades antrópicas desenvolvidas no Cerrado, a mineração é uma das que provocam significativos danos. A regeneração natural da vegetação em áreas mineradas é extremamente lenta e, portanto, a intervenção em lavras esgotadas faz-se necessária. O presente trabalho objetiva avaliar a sobrevivência e o crescimento de mudas de seis espécies arbóreas, submetidas a quatro tratamentos, usadas na revegetação de uma cascalheira em Brasília-DF. Os quatro tratamentos consistiram da combinação da utilização de cobertura morta sobre as covas e/ou o plantio de árvores em substrato coberto por Stylosanthes spp. Um tratamento controle, localizado em área adjacente não minerada, foi estabelecido para efeitos comparativos. Os resultados indicam que as mudas arbóreas implantadas na área minerada apresentaram maior sobrevivência e crescimento do que as mesmas espécies plantadas na área controle não minerada. Na área minerada não foram verificadas diferenças significativas no desenvolvimento das espécies em função dos tratamentos aplicados - cobertura morta sobre covas e/ou estrato herbáceo sobre a superfície minerada.

Among many human activities developed in areas of Brazilian savanna, mining is one that causes significative damage to the environment. Natural sucession on such sites is extremely slow and therefore revegetation works are necessary. This work aims to evaluate survival and growth of six tree species under four treatments grown on an exploited gravel mine in the Brazilian Federal District. The four treatments were drawn from the combination of mulching around tree seedlings and the establishment of Stylosanthes spp on the area surface. A control was established on a nearby unexploited for comparison reason. Results show a higher survival rate and growth of tree seedlings established on the exploited site than on the control-site which kept intact soil. There were no significant differences for survival and growth among trees established on the gravel mine under the four treatments - combined mulching and/or herbaceous layer on gravel mine surface.

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11.

Caracterização química da amêndoa de coquinho-azedo (Butia capitata var capitata)
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Faria, Juliana Pereira

; Arellano, Daniel Barrera

; Grimaldi, Renato

; Silva, Lucas Carvalho Ramos da

; Vieira, Roberto Fontes

; Silva, Dijalma Barbosa da

; Agostini-Costa, Tânia da Silveira

Revista Brasileira de Fruticultura

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- Sobre o periódico
- SciELO Analytics

jun 2008, Volume 30 N. 2 Pages 549 - 552

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

A palmeira Butia capitata var capitata produz o coquinho-azedo, fruto de odor agradável e penetrante, cuja polpa é aproveitada para a produção de um suco saboroso na região norte de Minas Gerais. As sementes apresentam uma amêndoa cuja exploração ainda é bastante limitada. O objetivo deste trabalho foi determinar a composição da amêndoa do coquinho-azedo, visando a avaliar suas possibilidades de uso. Na amêndoa, a composição química (umidade, proteínas, lipídios, cinzas e fibras) foi determinada por métodos gravimétricos. Os teores dos principais minerais foram avaliados por espectrofotometria de emissão atômica com fonte de plasma indutivo, e a composição dos ácidos graxos presentes na gordura da semente foi determinada por cromatografia a gás. A amêndoa do coquinho-azedo apresentou 9,9 % de umidade e 57,8 % de lipídios totais, 25,8 % de fibra detergente neutro, 17,6 % de fibra detergente ácido e 1,6 % de cinzas em base seca. A gordura extraída da amêndoa de coquinho-azedo apresentou elevados teores de ácido láurico (42,1 %), que foi seguido pelo ácido oléico (16,9 %). Predominaram os ácidos graxos saturados (78,9 %), principalmente os de cadeia média (C6-C12).

The Butia capitata palm tree produce a very aromatic fruit named "coquinho-azedo", which freeze pulp is frequently used to produce agreeable juice in north of Minas Gerais, Brazil. "Coquinho-azedo" kernel contains a nut that is not frequently explored. The purpose of the present study was the chemical characterization of "coquinho-azedo" nut to evaluate the possibilities of its use. The moisture, lipids, ash and fiber contents were determined by gravimetric methods. The mineral profile was characterized by inductively coupled plasma spectrophotometer and the fatty acids profile was characterized by gas chromatography. The coquinho-azedo nut presented 9,9 % of moisture, 57,8 % of total lipid, 25,8 % of neutral detergent fiber, 17,6 % of acid detergent fiber and 1,6 % of ash. The fat from coquinho-azedo nut presented high content of lauric acid (42,1 %), followed by oleic acid (16,9 %). The saturated fatty acids predominated (78,9 %), mainly the medium chain length fatty acids (58,3 %).

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