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Abstract Physiological and yield evaluation of perennial forage plants grown in intercropping in the semiarid region is indispensable in the search for higher efficiency of the agricultural and livestock production systems. In this context, an experiment was carried out at the Experimental Station of the National Institute of the Semiarid Region - INSA, in the municipality of Campina Grande, Paraíba, Brazil, to evaluate the physiological efficiency and yield of prickly pear and gliricidia in intercropping. Treatments were distributed in randomized blocks, with six replicates, being represented by four spacings between gliricidia plants: S1 (1.0 m), S2 (1.5 m), S3 (2.0 m) and S4 (3.0 m) x 2.30 m between rows. Prickly pear was planted in double rows of 1.5 m x 0.8 m x 0.5 m. The analyzed variables were initial, maximum and variable fluorescence chlorophyll a, variable/initial fluorescence ratio, potential quantum yield and the fresh matter yield of both crops. Density planting of gliricidia up to 4,348 plants ha-1 increases its photochemical efficiency and yield, but reduces light energy capture by prickly pear in intercropping, whereas its yield is not influenced by cultivation density. Regardless of gliricidia density, prickly pear yield was not influenced. systems context INSA Grande Paraíba Brazil blocks replicates S 1.0 10 1 0 (1. m, , 15 5 2.0 20 2 (2. 3.0 30 3 (3. 230 2.3 1. 08 8 0. 05 initial a variableinitial ratio crops 4348 4 348 4,34 ha1 ha ha- density (1 2. (2 3. (3 23 434 34 4,3 ( 43 4,

https://doi.org/10.1590/1678-4324-2023220265

CO2 capture and water use efficiency in Opuntia stricta (Haw.) at different seasons and evaluation times
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SOUZA, JOSÉ THYAGO AIRES

; ARAÚJO, JUCILENE SILVA

; FÉLIX, EVALDO DOS SANTOS

; ALVES, RITA DE CÁSSIA

; FILHO, TARCÍSIO JOSÉ DE OLIVEIRA

; LIRA, ELDER CUNHA DE

Revista Colombiana de Ciencias Hortícolas

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Mai 2022, Volume 16 Nº 2 elocation e13525

Resumo: Es En | Texto: Es En | PDF: Es | PDF: En

RESUMEN El nopal forrajero Oreja de Elefante Mexicano está ampliamente incorporado a la cadena productiva animal de la región noreste de Brasil. Sin embargo, faltan estudios sobre la dinámica fisiológica de este cactus. Por lo anterior, se realizó este estudio en la Estação Experimental Prof. Ignácio Salcedo del Instituto Nacional do Semiárido (INSA), en Campina Grande, estado de Paraíba, Brasil. El objetivo del estudio fue evaluar la absorción de CO2 y los niveles de eficiencia en el uso del agua in Opuntia stricta (Haw.) durante diferentes estaciones e horas de evaluación. Los tratamientos se distribuyeron utilizando un arreglo factorial de 24×2, que correspondió a la evaluación de los procesos de intercambio de gases durante 24 horas en la época de lluvias (junio) y sequía (diciembre). Los parámetros evaluados fueron la conductancia estomática, la tasa de transpiración y absorción de CO2, la concentración interna de CO2, la eficiencia instantánea de uso del agua y la eficiencia intrínseca de uso del agua. Los resultados revelaron que el intercambio de gases en el nopal forrajero son más intensos durante la estación de lluvias, con buena estabilidad, que los bajos niveles de intercambio durante la estación época de sequía. Independientemente de la estación, la absorción de CO2 alcanzó su pico entre las 24:00 y las 2:00. Además, este intervalo de tiempo es el más adecuado para realizar análisis en condiciones de campo.

ABSTRACT The forage cactus Mexican Elephant Ear is widely incorporated into the animal productive chain of the northeast region of Brazil. However, there is a lack of studies on the physiological dynamics of this cactus. Therefore, this study was conducted at the Estação Experimental Prof. Ignácio Salcedo of the Instituto Nacional do Semiárido (INSA), in Campina Grande, State of Paraíba, Brazil. The aim of this study was to evaluate CO2 uptake and water-use efficiency levels in Opuntia stricta (Haw.) during different seasons and evaluation times. The treatments were distributed using a 24×2 factorial arrangement, which corresponded to the evaluation of gas exchange processes for 24 hours in the rainy (June) and dry (December) seasons. The evaluated parameters were stomatal conductance, transpiration and CO2 uptake rate, internal CO2 concentration,instantaneous water-use efficiency and intrinsic water-use efficiency. The results revealed that gas exchange in the forage cactus was more intense during the rainy season, with good stability, than the low exchange levels during the dry season. Regardless of the season, the CO2 uptake peaked between 24:00 and 02:00. In addition, this range of time is the most suitable to conduct analyses under field conditions.

https://doi.org/10.17584/rcch.2022v16i2.13525

Use and misuse of biomarkers and the role of D-dimer and C-reactive protein in the management of COVID-19: A post-hoc analysis of a prospective cohort study
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Gonçalves, Fabio Augusto Rodrigues

; Besen, Bruno Adler Maccagnan Pinheiro

; Lima, Clarice Antunes de

; Corá, Aline Pivetta

; Pereira, Antônio José Rodrigues

; Perazzio, Sandro Félix

; Gouvea, Christiane Pereira

; Fonseca, Luiz Augusto Marcondes

; Trindade, Evelinda Marramon

; Sumita, Nairo Massakazu

; Duarte, Alberto José da Silva

; Lichtenstein, Arnaldo

; Bonfa, Eloisa

; Utiyama, Edivaldo M.

; Segurado, Aluisio C.

; Perondi, Beatriz

; Miethke-Morais, Anna

; Montal, Amanda C.

; Harima, Leila

; Fusco, Solange R. G.

; Silva, Marjorie F.

; Rocha, Marcelo C.

; Marcilio, Izabel

; Rios, Izabel Cristina

; Kawano, Fabiane Yumi Ogihara

; Jesus, Maria Amélia de

; Kallas, Ésper George

; Carmo, Carolina

; Tanaka, Clarice

; Souza, Heraldo Possolo de

; Marchini, Julio F. M.

; Carvalho, Carlos

; Ferreira, Juliana C.

; Levin, Anna Sara Shafferman

; Oliveira, Maura Salaroli

; Guimarães, Thaís

; Lázari, Carolina dos Santos

; Sabino, Ester

; Magri, Marcello M. C.

; Barros-Filho, Tarcisio E. P.

; Francisco, Maria Cristina Peres Braido

; Costa, Silvia F.

Clinics

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2021, Volume 76 elocation e3547

Resumo: En | Texto: En | PDF: En

OBJECTIVE: Coronavirus disease 2019 (COVID-19) is associated with high mortality among hospitalized patients and incurs high costs. Severe acute respiratory syndrome coronavirus 2 infection can trigger both inflammatory and thrombotic processes, and these complications can lead to a poorer prognosis. This study aimed to evaluate the association and temporal trends of D-dimer and C-reactive protein (CRP) levels with the incidence of venous thromboembolism (VTE), hospital mortality, and costs among inpatients with COVID-19. METHODS: Data were extracted from electronic patient records and laboratory databases. Crude and adjusted associations for age, sex, number of comorbidities, Sequential Organ Failure Assessment score at admission, and D-dimer or CRP logistic regression models were used to evaluate associations. RESULTS: Between March and June 2020, COVID-19 was documented in 3,254 inpatients. The D-dimer level ≥4,000 ng/mL fibrinogen equivalent unit (FEU) mortality odds ratio (OR) was 4.48 (adjusted OR: 1.97). The CRP level ≥220 mg/dL OR for death was 7.73 (adjusted OR: 3.93). The D-dimer level ≥4,000 ng/mL FEU VTE OR was 3.96 (adjusted OR: 3.26). The CRP level ≥220 mg/dL OR for VTE was 2.71 (adjusted OR: 1.92). All these analyses were statistically significant (p<0.001). Stratified hospital costs demonstrated a dose-response pattern. Adjusted D-dimer and CRP levels were associated with higher mortality and doubled hospital costs. In the first week, elevated D-dimer levels predicted VTE occurrence and systemic inflammatory harm, while CRP was a hospital mortality predictor. CONCLUSION: D-dimer and CRP levels were associated with higher hospital mortality and a higher incidence of VTE. D-dimer was more strongly associated with VTE, although its discriminative ability was poor, while CRP was a stronger predictor of hospital mortality. Their use outside the usual indications should not be modified and should be discouraged.

https://doi.org/10.6061/clinics/2021/e3547

Foraging preferences of the native stingless bee Melipona seminigra pernigra (Apidae: Meliponini) in campo rupestre on canga of Serra dos Carajás, southeastern Amazonia
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Guimarães, José Tasso Felix

; Costa, Luciano

; Zappi, Daniela Cristina

; Batista Junior, Wilson Filgueira

; Lopes, Karen da Silva

; Alves, Ronnie Cley de Oliveira

; Romeiro, Luiza de Araújo

; Silva, Edilson Freitas da

; Carreira, Léa Maria Medeiros

; Rodrigues, Tarcísio Magevski

; Giannini, Tereza Cristina

; Imperatriz-Fonseca, Vera Lucia

; Barth, Ortrud Monika

Biota Neotropica

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2021, Volume 21 Nº 1 elocation e20201004

Resumo: Pt En | Texto: Pt En | PDF: Pt | PDF: En

Resumo: O conteúdo polínico de amostras de mel coletadas nos anos de 2017 e 2019 de apiários experimentais de Melipona seminigra pernigraMoure & Kerr 1950, instalado dentro de uma vegetação de campo rupestre em um afloramento de canga na Serra dos Carajás, sudeste da Amazônia, foi analisado para entender a variabilidade local dos recursos florais em áreas naturais e perturbadas. Aproximadamente 100% dos tipos polínicos foram identificados e pertencem principalmente às famílias Fabaceae, Myrtaceae e Euphorbiaceae (31, 6 e 5 espécies, respectivamente). Áreas de mineração apresentaram a maior riqueza de pólen, quase o dobro daquelas identificadas em áreas perturbadas. 80% dos tipos de pólen são raros com concentrações ≤ 2.000 grãos de pólen/10g, enquanto que os restantes foram os mais abundantes, frequentes e fontes primárias para as abelhas. Este últimos correspondem principalmente a plantas nativas como Tapirira guianensis Aubl., Protium spp., Aparisthmium cordatum (A.Juss.) Baill., Mimosa acutistipula var. ferrea Barneby, Periandra mediterrânea (Vell.) Taub., Miconia spp., Pleroma carajasense K.Rocha, Myrcia splendens (Sw.) DC., Serjania spp. e Solanum crinitum Lam. Todos os tipos polínicos foram identificados durante ambas as estações, mas altas concentrações estão relacionadas ao período seco (junho-setembro). A análise estatística indicou que não houve diferença significativa nos dados de pólen de mel entre áreas naturais e áreas anteriormente degradadas, uma vez que as fontes primárias das abelhas deste estudo são amplamente utilizadas na revegetação de áreas mineradas.

Abstract: Honey pollen samples of Melipona seminigra pernigraMoure & Kerr 1950 sampled between 2017 and 2019 from experimental apiaries installed in campo rupestre on canga (CRC) vegetation of the Serra dos Carajás aimed to evaluated seasonal floral availability of undisturbed and mining-influenced areas. Around one hundred pollen types were identified mainly belonging to Fabaceae, Myrtaceae and Euphorbiaceae (31, 6 and 5 species, respectively). Mining area presented the highest pollen richness, almost twice those identified in the undisturbed areas. 80% of the pollen types are rare with concentrations ≤ 2,000 pollen grains/10 g, while the remaining were the most abundant, frequent and the primary bee sources. These latter correspond mostly to native plants species such as Tapirira guianensis Aubl., Protium spp., Aparisthmium cordatum (A.Juss.) Baill., Mimosa acutistipula var. ferrea Barneby, Periandra mediterranea (Vell.) Taub., Miconia spp., Pleroma carajasense K.Rocha, Myrcia splendens (Sw.) DC., Serjania spp. and Solanum crinitum Lam. All pollen types were identified during both seasons, but higher concentration values are related to the dry period (June-September). The statistical analysis of the pollen data indicated that there was no significant difference between undisturbed and mining-influenced areas, since primary bee sources of this study are widespread used in revegetation of mined areas.

https://doi.org/10.1590/1676-0611-bn-2020-1004 777 downloads

Durability of Eucalypts wood in soil bed and field decay tests
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Medeiros Neto, Pedro Nicó de

; Paes, Juarez Benigno

; Oliveira, José Tarcísio da Silva

; da Silva, João Gabriel Missia

; Coelho, José Clailson Franco

; Ribeiro, Libânia da Silva

Maderas. Ciencia y tecnología

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Out 2020, Volume 22 Nº 4 Páginas 447 - 456

Resumo: En | Texto: En | PDF: En

Abstract: This evaluated the natural resistance of wood from seven Eucalyptus trees in field decay and soil bed tests. Two 12-year-old trees were randomly sampled per species, with 2,2 m logs being obtained from the basal section of each tree. The samples were taken in two positions in the radial direction of the stem (middle heartwood and transition zone; containing heartwood and sapwood). The field decay tests were installed in three municipalities in the southern state of Espírito Santo, and the soil utilized soil from the three field decay test areas. The field decay tests were evaluated after six, 12 and 18 months after installation and the soil bed tests after six months. The Scott-Knott test (p ≤ 0,05) was used in the analysis and evaluation of the tests. The sapwood-heartwood (transition region) exhibited the greatest mass losses for the field decay and soil bed tests. On average, for the soil bed test the lowest mass losses were observed for the soil of Vargem Alta (5,00 %), with greater mass losses observed for São José do Calçado (7,05 %) and Jerônimo Monteiro (9,90 %). In the field decay test the organisms present in the soil of São José do Calçado and related to the organic matter content Eucalyptus grandis and Eucalyptus saligna more intensely.

326 downloads

ESPORTE E LAZER NO PLANO INDIVIDUAL DE ATENDIMENTO DE ADOLESCENTES EM CUMPRIMENTO DE MEDIDA SOCIOEDUCATIVA DE INTERNAÇÃO
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Oliveira, Ueliton Peres de

; Conceição, Willian Lazaretti da

; Grunnenvaldt, José Tarcísio

; Olivera, Raul Angel Carlos

; Reverdito, Riller Silva

Movimento

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2020, Volume 26 elocation e26054

Resumo: Pt En Es | Texto: Pt En Es | PDF: Pt | PDF: En | PDF: Es

Resumo: Esta pesquisa documental tem por objetivo compreender o acesso ao esporte e lazer na trajetória de adolescentes em cumprimento de medida socioeducativa de internação no estado de Mato Grosso. Foram analisados 36 Planos Individuais de Atendimento (PIA) de sete Centros de Atendimento Socioeducativo, elaborados entre os anos de 2017-2018 e disponibilizados pela Gestão Estadual do Sistema para Infância e Adolescência - SIPIA/SINASE/MT. Os dados relacionados aos eixos esporte e lazer foram analisados através da análise de conteúdo. O perfil dos adolescentes retrata os problemas socioeconômicos e de vulnerabilidade social presentes na contemporaneidade. A partir das categorias de análise observou-se a restrita oferta dessas políticas de atendimento na trajetória dos adolescentes. Conclui-se que o cumprimento da medida socioeducativa de internação propiciou maior acesso aos espaços, equipamentos e conteúdos de esporte e lazer aos adolescentes, se comparado com suas vivências anteriores à aplicação da medida.

Abstract: This research aims to understand the access to sports and leisure in adolescents’ lives in compliance with court-mandated social-educative internment in the state of Mato Grosso. Thirty-six Individual Care Plans of seven Socio-Educational Care Centers were examined, which had been created between 2017-2018 and publicized by the State Management of the System for Childhood and Adolescence - SIPIA/SINASE/MT. Data related to sports and leisure were submitted to content analysis. The adolescents’ profiles show today’s socioeconomic problems and social vulnerability. Based on the categories of analysis, the offer of these care policies in the adolescents’ lives was observed to be restricted. Compliance to court-mandated social-educative internment is found to provide greater access to sports and leisure spaces, equipment and contents to the adolescents when compared to their experiences before the sentence.

Resumen: Este estudio tiene por objetivo comprender el acceso al deporte y a la recreación de adolescentes que cumplen medidas socioeducativas de internación en el Estado de Mato Grosso. Se analizaron 36 Planes Individuales de Asistencia (PIA) de siete Centros de Asistencia Socioeducativa, elaborados en los años 2017 y 2018 y puestos a disposición por la Administración Estatal del Sistema para la Infancia y Adolescencia - SIPIA/SINASE/MT. Los datos relacionados a los ejes deportes y recreación se analizaron a través de la metodología de análisis de contenido. El perfil de los adolescentes retrata los problemas socioeconómicos y de vulnerabilidad social presentes actualmente. A partir de las categorías de análisis, se observó una oferta limitada de estas políticas de asistencia en la trayectoria de los adolescentes. Se concluye que el cumplimiento de medidas socioeducativas de internación propició un mayor acceso a los espacios y contenidos de deporte y recreación a los adolescentes, en comparación con sus experiencias previas a la aplicación de las medidas.

https://doi.org/10.22456/1982-8918.101588 868 downloads

ADOLESCENTES E CONDUTA INFRACIONAL: ESPAÇOS, EQUIPAMENTOS E CONTEÚDOS DE ESPORTE E LAZER
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Oliveira, Ueliton Peres de

; Conceição, Willian Lazaretti da

; Grunnenvaldt, José Tarcísio

; Olivera, Raul Angel Carlos

; Reverdito, Riller Silva

Movimento

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2020, Volume 26 elocation e26079

Resumo: Pt En Es | Texto: Pt En Es | PDF: Pt | PDF: En | PDF: Es

Resumo: Este estudo exploratório e descritivo tem por objetivo identificar os espaços, equipamentos e conteúdos de esporte e lazer de um município do estado de Mato Grosso, com maior incidência de adolescentes em cumprimento de medida socioeducativa de internação nos anos de 2017 e 2018. Os dados foram disponibilizados pela Gestão Estadual do Sistema de Informação para Infância e Adolescência (SIPIA). Realizaram-se observações in loco em oito bairros, utilizando categorias de análise predefinidas para registros em diário de campo. Os resultados demonstram a escassa oferta de espaços, equipamentos e conteúdos de esporte e lazer disponibilizados aos adolescentes dessas comunidades. Diante desse cenário, a falta de acesso às políticas de esporte e lazer pode configurar como possível fator de risco ao cometimento de ato infracional no contexto pesquisado, além da exposição dos jovens ao mesmo risco ao retornarem à comunidade.

Abstract: This exploratory and descriptive study aims to identify sports and leisure spaces, equipment and contents of a municipality in the Brazilian state of Mato Grosso with higher incidence of adolescents sentenced to socio-educational internment in 2017 and 2018. Data were provided by the State Management of the Children and Adolescents Information System (SIPIA). On-site observation was carried out in eight neighborhoods, using predefined analytical categories for field diary records. The results point to scarce offer of sport and leisure spaces, equipment and content in those communities. In view of this scenario, the study concludes that the lack of access to sports and leisure policies is seen as a possible risk factor for committing infractions in the context researched, in addition to exposing young people to the same risk when they return to their communities.

Resumen: Este estudio exploratorio y descriptivo tiene por objetivo identificar los espacios, equipos y contenidos de deporte y recreación de un municipio del estado de Mato Grosso que tiene mayor incidencia de adolescentes en cumplimiento de medida socioeducativa de internación durante los años 2017 y 2018. Los datos fueron puestos a disposición por la Administración Estatal del Sistema de Información para Infancia y Adolescencia (SIPIA). Se realizaron observaciones in situ en ocho barrios, utilizando categorías de análisis predefinidas para registros en diario de campo. Los resultados demuestran la escasa oferta de espacios, equipos y contenidos de deporte y recreación que se ofrece a los adolescentes de esas comunidades. Ante este escenario, la falta de acceso a políticas de deporte y recreación puede configurarse como posible factor de riesgo para cometer infracciones en el contexto investigado, además de exponer a los jóvenes al mismo riesgo cuando regresan a la comunidad.

https://doi.org/10.22456/1982-8918.102733 1474 downloads

Effect Of Planting Spacing In Production And Permeability Of Heartwood And Sapwood Of Eucalyptus Wood
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Brito, Alice Soares

; Vidaurre, Graziela Baptista

; Oliveira, José Tarcísio da Silva

; Missia da Silva, João Gabriel

; Rodrigues, Brunela Pollastrelli

; Carneiro, Angélica de Cássia Oliveira

Floresta e Ambiente

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2019, Volume 26 Nº spe1 elocation e20180378

Resumo: Pt En | Texto: Pt En | PDF: Pt | PDF: En

RESUMO O objetivo deste trabalho foi avaliar a influência de diferentes áreas úteis proporcionadas pelos espaçamentos de plantio (3 × 1, 3 × 2, 3 × 3, 3 × 4 m) na produção e na permeabilidade do cerne e do alburno da madeira de clones de Eucalyptus grandis e Eucalyptus grandis × Eucalyptus urophylla, aos 4 anos de idade. Independente do clone, não houve efeito do espaçamento de plantio na relação cerne/alburno e na permeabilidade da madeira. Todos os clones apresentaram um decréscimo na quantidade de cerne com o aumento da altura do fuste, independentemente do espaçamento de plantio, e o E. grandis (B) foi o único que a percentagem de cerne correlacionou-se positiva e significativamente com as variáveis dendrométricas (DAP e altura comercial). O uso do composto dymethil yellow foi indispensável na demarcação das regiões do cerne e do alburno nas amostras a partir de 50% da altura do fuste. A permeabilidade do cerne foi baixa em todos os clones avaliados, sugerindo obstrução dos vasos por tilas ou outras substâncias, enquanto a permeabilidade do alburno atingiu 405,4 cm3/cm.atm.s.

ABSTRACT The objective of this work was to evaluate the influence of different useful areas provided by the planting spacings (3 × 1, 3 × 2, 3 × 3, 3 × 4 m) on the production and permeability of heartwood and sapwood of Eucalyptus grandis and Eucalyptus grandis × Eucalyptus urophylla clones at 4 years old. Regardless of the clone, there was no effect of planting spacing on the heartwood/sapwood relation and wood permeability. All clones showed a heartwood decrease with increased height, regardless of planting spacing, and E. grandis (B) was the only one that had its heartwood percentage positively and significantly correlated with the dendrometric variables (DBH and commercial height). The use of the dymethil yellow compound was indispensable in defining the heartwood and sapwood regions in the samples from 50% of the stem height. The heartwood permeability was low in all evaluated clones, suggesting vessel obstruction by tyloses or other deposits, while sapwood permeability reached 405.4 cm3/cm.atm.s.

https://doi.org/10.1590/2179-8087.037818 1957 downloads

Environmental Effect on Growth and Characteristics of Eucalyptus Wood
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Freitas, Thaís Pereira

; Oliveira, José Tarcisio da Silva

; Paes, Juarez Benigno

; Vidaurre, Graziela Baptista

; Lima, José Luis

Floresta e Ambiente

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2019, Volume 26 Nº 4 elocation e20160302

Resumo: En | Texto: En | PDF: En

ABSTRACT The objective of this work was to evaluate environmental effect on growth, wood basic density and anatomical characteristics of Eucalyptus grandis × Eucalyptus urophylla clones for pulp production. The studied clones were from 6.5-year-old plantations of Fibria Celulose company, located in two places: Nova Almeida (ES) and Posto da Mata (BA). The total and commercial heights, diameter at breast height (DBH), wood and bark volume (dendrometric characteristics), heartwood and sapwood percentages, wood basic density and wood fibers and vessels were evaluated. The heartwood and sapwood percentage and vessel frequency were the only characteristics not influenced by the growth site among the studied parameters. On the other hand, tree height (total and commercial) was considered the most influenced by the environment.

https://doi.org/10.1590/2179-8087.030216 410 downloads

10.

Biological Resistance of Two Reforestation Woods to Dry Wood Termites
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Oliveira, José Tarcisio da Silva

; Paes, Juarez Benigno

Floresta e Ambiente

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2019, Volume 26 Nº 4 elocation e20170558

Resumo: En | Texto: En | PDF: En

ABSTRACT This work aimed to evaluate the biological resistance of Australian red cedar (Toona ciliata) and Eucalyptus woods to the Cryptotermes brevis (Kalotermitidae) dry wood termite species. The species used to evaluate natural resistance to insect attacks were Australian red cedar from 6 and 12-year-old plantations installed in the mountainous region of the Espírito Santo state, and commercial adult Eucalyptus sp. wood provided by a sawmill located in the South of Bahia state. Fitting and evaluation of the experiment followed the recommendations of the Institute for Technological Research of the State of São Paulo. The three woods differed as to their susceptibility to attack by dry wood termites when the damage caused in the samples was considered, with the most consumed species being the 12-year old Australian red cedar, while the Eucalyptus wood was less susceptible to damage.

https://doi.org/10.1590/2179-8087.055817 1079 downloads

11.

ANÁLISE ERGONÔMICA DO AMBIENTE DE TRABALHO NA FABRICAÇÃO DE FERRAMENTAS FLORESTAIS
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Guimarães, Pompeu Paes

; Fiedler, Nilton César

; Oliveira, José Tarcísio da Silva

; Leite, Ângelo Marcio Pinto

; Lima, Julião Soares de Souza

Ciência Florestal

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Dez 2018, Volume 28 Nº 4 Páginas 1651 - 1665

Resumo: Pt En | Texto: Pt En | PDF: Pt | PDF: En

RESUMO Esta pesquisa objetivou avaliar o ambiente de trabalho em uma fábrica de produção de ferramentas. Este processo envolve as atividades de corte, orvado, viragem, forjadora, têmpera, inserção de cabos, esmeril, envernizamento e soldagem. Para avaliar o conforto térmico foi utilizado o IBUTG, para medir a velocidade do vento o anemômetro, luxímetro para avaliar a luminosidade e decibelímetro para analisar a exposição dos trabalhadores ao ruído. Os dados de IBUTG variaram em média de 20,9°C a 27,3°C. A forjadora apresentou os maiores valores de IBUTG em média durante todo o processo produtivo. Todas as atividades apresentaram velocidade do vento abaixo de 0,75 m/s, sendo aceitável para a jornada de trabalho. A iluminância, em média oscilou de 42,9 lux a 393,3 lux. As atividades de envernizamento, têmpera, forjadora e inserção de cabos apresentaram médias de iluminância abaixo dos 150 lux necessários durante toda a jornada de trabalho. Todas as atividades apresentaram ruídos acima de 85 dB(A), exceto o envernizamento e o corte. Os níveis de ruído variaram em média de 79,7 dB(A) no envernizamento às 8 h a 95,7 dB(A) no esmeril às 13 h.

ABSTRACT This research aimed to evaluate the work environment in a tool manufacturing factory. This process involves the cutting activities, orvado, turning, forger, temper, cable insertion, grinding, welding and varnishing. To evaluate the thermal comfort was used IBUTG to measure the wind speed anemometer, lux meter to evaluate the brightness and decibel meter to analyse the exposure of workers to noise. The data ranged IBUTG on average 20.9°C at 27.3°C. The forger had the highest IBUTG values averaged over the entire production process. All activities had wind speeds below 0.75 m/s, being perfectly acceptable for the entire workday. The average luminance oscillated from 42.9 lux to 393.3 lux. The activities of varnish, temper, forger and cable insertion had average illuminance below 150 lux required throughout the workday. All activities presented noise above 85 dB(A), except the varnishing and cutting. Noise levels ranged on average of 79.7 dB(A) in varnishing at 8 hours 95.7 dB (A), in the grinding at 13 hours.

https://doi.org/10.5902/1980509835315 1648 downloads

12.

Effect of the Brazilian process of thermal modification on the physical properties of Eucalyptus grandis juvenile wood
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Batista, Djeison Cesar

; Oliveira, José Tarcísio da Silva

; Paes, Juarez Benigno

; Nisgoski, Silvana

; Muñiz, Graciela Ines Bolzón de

Maderas. Ciencia y tecnología

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Out 2018, Volume 20 Nº 4 Páginas 715 - 724

Resumo: En | Texto: En | PDF: En

Abstract: This study is a continuation of a previous study published in this journal, with the aim of evaluating the effect of the Brazilian industrial thermal modification process on some physical properties of Eucalyptus grandis juvenile wood. Flatsawn boards of juvenile wood were tested for four treatment levels: untreated and thermally modified wood at final cycle temperatures of 140 °C, 160 °C and 180 °C. Physical properties were assessed according to a standard of the Comisión Panamericana de Normas Técnicas and a method proposed by the specialized literature encompassing equilibrium moisture content (a measure of wood’s hygroscopicity), density (oven-dried and air-dried) and radial, tangential and volumetric swelling (from oven-dried to green moisture content). Thermally modified Eucalyptus grandis wood became less hygroscopic, more dimensionally stable (tangential and volumetric swelling) and less dense, even at the lowest temperature tested (140 °C), except for radial swelling, which did not differ from untreated wood.

382 downloads

13.

ENVIRONMENTAL EFFECT ON CHEMICAL COMPOSITION OF EUCALYPTUS CLONES WOOD FOR PULP PRODUCTION
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Freitas, Thaís Pereira

; Oliveira, José Tarcísio da Silva

; Vidaurre, Graziela Baptista

; Rodrigues, Brunela Pollastrelli

CERNE

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Set 2018, Volume 24 Nº 3 Páginas 219 - 224

Resumo: En | Texto: En | PDF: En

ABSTRACT This study aimed to evaluate the environmental effect on the wood chemical composition of Eucalyptus grandis x Eucalyptus urophylla clones for pulp production. Seven clones of 6.5 years old were evaluated. The clones were planted in two growing sites, Nova Almeida - Espírito Santo and Posto da Mata - Bahia, established in 3 x 3 m spacing. Five trees were selected from each clone and discs were removed from five different positions equidistant from the trunk and at diameter at breast height (DBH) height. Two wedge from opposite sides were obtained from the discs. A chemical analysis was performed with a sample composed of all the wedges of each tree in order to determine extractive contents, lignin, holocellulose, carbohydrates and the ratio among syringyl (S) and guaiacyl (G) lignin substructures (S/G) per tree. The S/G ratio was considered to be the most stable characteristic to environmental change, followed by the holloceluloose content, which was considered the second least characteristic influenced by the growth site. Most of the studied clones presented a statistical difference between the growing site for the wood extractive content, in contrast to the total carbohydrates content that was highlighted by presenting values which were little influenced by the genetic material and the growth site.

https://doi.org/10.1590/01047760201824032558 573 downloads

14.

Efecto del ataque de Leptocybe invasa en plantaciones de eucalipto destinadas a la producción de pulpa de celulosa kraft
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Bobadilha, Gabrielly dos Santos

; Vidaurre, Graziela Baptista

; Câmara, Ana Paula

; Valin, Marina

; Oliveira, José Tarcísio da Silva

; Soliman, Everton Pires

; Lopez, Yonny Martinez

Maderas. Ciencia y tecnología

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Jun 2018, Volume 20 Nº 2 Páginas 171 - 182

Resumo: En Es | Texto: En Es | PDF: En | PDF: Es

Abstract: The aim of the research was to evaluate the effect of the attack Leptocybe invasa in dendrometric variables and wood properties of two clones of eucalyptus (Eucalyptus urophylla and Eucalyptus tereticornis), grown in the municipalities of Imperatriz (state of Maranhão) and Darcinopolis (state of Tocantins), Brazil, for Kraft pulping. Data were collected 10 trees for each clone, the 3-year-old attacked by L. invasa. The diagnosed was based on formation of large guts all over the glass, and emergency hole (closing the loop). The results were confirmed by the variation of the characteristics of species assessed relative to their total height, diameter, volume of bark, vessel frequency, fiber size, radial density profile vessel frequency, fiber size, radial density profile, and ash content. Host trees obtained alterations in dendrometric variables, content of pentosans and wood ashes for both genetic materials, not being observed variations in specific gravity, and size of vessels and fibers, as well as the contents of lignin and wood extractives.

Resumen: El objetivo de la investigación fue evaluar el efecto del ataque de Leptocybe invasa en las propiedades dendrométricas de la madera de dos clones de eucalipto (Eucalyptus urophylla y Eucalyptus tereticornis), cultivados en los municipios de Imperatriz (Estado do Maranhão) y Darcinópolis (Estado de Tocantins), Brasil, destinados a la producción de pulpa kraft. Se analizaron 10 árboles de 3 años de edad atacados por Leptocybe invasa, para cada clon. El diagnóstico fue basado en la formación de grandes agallas en la copa, y con orificio de emergencia (cerrando el ciclo). Los resultados fueron constatados por la variación de las características de las especies evaluadas con relación a su altura total, diámetro, volumen de corteza, frecuencia de vasos, longitud de fibras, perfil radial de densidad y contenido de cenizas. Los árboles hospederos presentaron alteraciones en las variables dendrométricas, contenido de pentosanos y cenizas en la madera para ambos materiales genéticos, no siendo observadas variaciones en la densidad básica, dimensión de vasos y fibras, así como en los contenidos de lignina y extractivos de la madera.

629 downloads

15.

PHYSIOLOGICAL DISORDERS AFFECTING DENDROMETRIC PARAMETERS AND EUCALYPTUS WOOD QUALITY FOR PULPING WOOD
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Câmara, Ana Paula

; Oliveira, José Tarcísio da Silva

; Bobadilha, Gabrielly dos Santos

; Vidaurre, Graziela Baptista

; Tomazello Filho, Mario

; Soliman, Everton Pires

CERNE

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Mar 2018, Volume 24 Nº 1 Páginas 27 - 34

Resumo: En | Texto: En | PDF: En

ABSTRACT The productive sustainability of eucalyptus planting is threatened when both diseases and disorders of growth occur. These interferences can have abiotic origin as environmental conditions can negatively affect the wood quality. This study has the goal of evaluating influence of different levels of physiological disorders in dendrometric variables and wood quality from seven-year-old Eucalyptus grandis x Eucalyptus urophylla hybrids intended for wood pulping production. The trees from commercial plantations in State of Maranhão, Brazil were separated into three levels of physiological disorders by means of morphologic changes. Then, they were evaluated according to dendrometric variables, anatomical characteristics, chemical properties, density of wood, and kraft pulp process. The physiological disorder levels significantly influenced all evaluated properties. Moreover, the wood from trees with higher severity of symptoms resulted in higher average values of dendrometric variables, basic density, and fibers dimensions. In addition, apparent density exhibited a different standard in the pith region with increase on radial wood profile. Trees with the least severe disorders exhibited changes in dendrometric and anatomical variables, mainly in wood volume and fibers dimensions, respectively.

https://doi.org/10.1590/01047760201824012480 1220 downloads

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