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Abstract A high frequency of feline leishmaniasis has been reported in several countries. However, much information about disease progression in cats still needs to be clarified. This study aimed to verify the occurrence of clinicopathological changes in cats infected with Leishmania infantum. A total of 60 cats were divided into three groups of 20 animals each: control, suspects, and infected. All 60 cats underwent blood count and biochemical analyses. Serum samples from 20 animals with leishmaniasis were also used to diagnose feline immunodeficiency virus and feline leukemia virus. A total of five of the infected animals underwent necropsy for a histopathological study. The main clinical findings in cats with leishmaniasis were lymphadenomegaly (65%), alopecia (55%), ulcerative skin lesions and weight loss (40%), skin nodules (25%), a significant reduction in red blood cells (p=0.0005) and hematocrit (p=0.0007), hyperplasia in spleen 4/5(80%), presence of Leishmania in the spleen 2/5(40%), hepatitis 3/5(60%), liver degeneration 4/5(80%) and inflammatory nephropathy 3/5(60%). It was concluded that cats with leishmaniasis presented significant clinical, hematological, and histopathological alterations compatible with L. infantum infection. The observation of lymphadenomegaly, weight loss, skin lesions and low concentration of red blood cells, contributes significantly to the diagnosis and analysis of progression of feline leishmaniasis.

Resumo Uma alta frequência de leishmaniose felina tem sido relatada em vários países. No entanto, muitas informações sobre a progressão da doença em gatos ainda precisam ser esclarecidas. Este estudo teve como objetivo verificar a ocorrência de alterações clinicopatológicas em gatos infectados por Leishmania infantum. Um total de 60 gatos foi dividido em três grupos de 20 animais cada: controle, suspeitos e infectados. Todos os 60 gatos foram submetidos à hemograma e testes bioquímicos. Amostras de soro de 20 animais com leishmaniose também foram utilizadas para diagnosticar o vírus da imunodeficiência felina e o vírus da leucemia felina. Um total de cinco dos animais infectados foram necropsiados para estudo histopatológico. Os principais achados clínicos nos gatos com leishmaniose foram linfadenomegalia (65%), alopecia (55%), lesões ulcerativas na pele e emagrecimento (40%), nódulos cutâneos (25%), redução significativa de hemácias (p=0,0005) e hematócrito (p=0,0007), hiperplasia no baço 4/5(80%), presença de Leishmania no baço 2/5(40%), hepatite 3/5(60%), degeneração hepática 4/5(80%) e nefropatia inflamatória 3/5(60%). Concluiu-se que gatos com leishmaniose apresentaram alterações clínicas, hematológicas e histopatológicas significativas compatíveis com infecção por L. infantum. A observação de linfadenomegalia, emagrecimento, lesões cutâneas e baixa concentração de hemácias, contribui significativamente para o diagnóstico e análise da progressão da leishmaniose felina.

https://doi.org/10.1590/s1984-29612023037

ST-Elevation in a Patient with Acute Chagas Disease
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Pinto, Guilherme Dantas Campos

; Pimentel, José Henrique Martins

; Barros, Maria das Neves Dantas da Silveira

; Medeiros, Carolina de Araújo

; Carrazzone, Cristina de Fátima Velloso

; Matins, Silvia Marinho

; Oliveira Júnior, Wilson Alves de

International Journal of Cardiovascular Sciences

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jun 2022, Volume 35 N. 3 Pages 419 - 422

Abstract: En | Text: En | PDF: En

https://doi.org/10.36660/ijcs.20200396

Atualização da Diretriz Brasileira de Hipercolesterolemia Familiar – 2021
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Izar, Maria Cristina de Oliveira

; Giraldez, Viviane Zorzanelli Rocha

; Bertolami, Adriana

; Santos Filho, Raul Dias dos

; Lottenberg, Ana Maria

; Assad, Marcelo Heitor Vieira

; Saraiva, José Francisco Kerr

; Chacra, Ana Paula M.

; Martinez, Tania L. R.

; Bahia, Luciana Ribeiro

; Fonseca, Francisco Antonio Helfenstein

; Faludi, Andre Arpad

; Sposito, Andrei C.

; Chagas, Antônio Carlos Palandri

; Jannes, Cinthia Elim

; Amaral, Cristiane Kovacs

; Araújo, Daniel Branco de

; Cintra, Dennys Esper

; Coutinho, Elaine dos Reis

; Cesena, Fernando

; Xavier, Hermes Toros

; Mota, Isabela Cardoso Pimentel

; Giuliano, Isabela de Carlos Back

; Faria Neto, José Rocha

; Kato, Juliana Tieko

; Bertolami, Marcelo Chiara

; Miname, Marcio Hiroshi

; Castelo, Maria Helane Costa Gurgel

; Lavrador, Maria Sílvia Ferrari

; Machado, Roberta Marcondes

; Souza, Patrícia Guedes de

; Alves, Renato Jorge

; Machado, Valeria Arruda

; Salgado Filho, Wilson

Arquivos Brasileiros de Cardiologia

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oct 2021, Volume 117 N. 4 Pages 782 - 844

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

https://doi.org/10.36660/abc.20210788 231 downloads

Oportunidades e Desafios no CenÃ¡rio de (PÃ³s-)Pandemia para Transformar a EducaÃ§Ã£o Mediada por Tecnologias
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Dotta, Silvia

; Pimentel, Edson

; Silveira, Ismar

; Braga, Juliana

Revista Iberoamericana de Tecnología en Educación y Educación en Tecnología

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mar 2021, N. 28 Pages 157 - 167

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

Sem aulas presenciais, a pandemia do SARS-CoV-2 impÃ´s, para a continuidade dos processos de ensino-aprendizagem, o uso das Tecnologias da InformaÃ§Ã£o e ComunicaÃ§Ã£o (TIC) na forma de um conjunto de ferramentas, via internet. De forma emergencial, professores e estudantes foram instados a utilizar computadores e celulares, por meio de plataformas virtuais, para experiÃªncias de aprendizagem. A esperada transformaÃ§Ã£o da EducaÃ§Ã£o, do modelo massivo transmissivo para uma aprendizagem ativa, com o suporte das tecnologias finalmente poderia tornar-se uma realidade. Contudo, vulnerabilidades existentes mas subreptÃcias e ignoradas foram reveladas e evidenciadas. Destaca-se o fato de que muitas pessoas nÃ£o tÃªm acesso a computador, nem Ã internet com velocidade e volume de acesso suficientes. Muitos professores nÃ£o possuem conhecimento pedagÃ³gico adequado para uso dessas ferramentas nas suas prÃ¡ticas educativas. Mesmo assim, muitas experiÃªncias de uso de TIC na EducaÃ§Ã£o tÃªm ocorrido nesse cenÃ¡rio de pandemia na forma de ensino remoto emergencial. Planejamentos para um pÃ³s-pandemia jÃ¡ contemplam a EducaÃ§Ã£o hÃbrida. Este ensaio objetiva discutir aspectos a serem considerados no contexto da EducaÃ§Ã£o mediada por tecnologias, mesmo em um cenÃ¡rio emergencial. Ã‰ um convite para uma reflexÃ£o sobre as prÃ¡ticas pedagÃ³gicas e as possibilidades de mediaÃ§Ã£o da aprendizagem com o uso das TIC.

With no face-to-face classes, the SARS-CoV-2 pandemic imposed, for the continuity of teaching-learning processes, the use of Information and Communication Technologies (ICT) in the form of a set of tools, through the internet. In an emergency, teachers and students were urged to use computers and cell phones, through virtual platforms, for learning experiences. The expected transformation of education, from the massive transmissive model to active learning, could finally become a reality with the support of technologies. However, existing but surreptitious and ignored vulnerabilities have been revealed and highlighted. It is noteworthy that many people do not have access to a computer or the internet with sufficient speed and volume of access. Many teachers do not have adequate pedagogical knowledge to use these tools in their educational practices. Even so, many experiences of using ICT in Education have occurred in this pandemic scenario in the form of emergency remote education. Plans for a post-pandemic already include hybrid education. This essay aims to discuss aspects to be considered in the context of technology-mediated education, even in an emergency scenario. It is an invitation to reflect on pedagogical practices and the possibilities of mediating learning using ICT.

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Posicionamento sobre o Consumo de Gorduras e Saúde Cardiovascular – 2021
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Izar, Maria Cristina de Oliveira

; Lottenberg, Ana Maria

; Giraldez, Viviane Zorzanelli Rocha

; Santos Filho, Raul Dias dos

; Machado, Roberta Marcondes

; Bertolami, Adriana

; Assad, Marcelo Heitor Vieira

; Saraiva, José Francisco Kerr

; Faludi, André Arpad

; Moreira, Annie Seixas Bello

; Geloneze, Bruno

; Magnoni, Carlos Daniel

; Scherr, Carlos

; Amaral, Cristiane Kovacs

; Araújo, Daniel Branco de

; Cintra, Dennys Esper Corrêa

; Nakandakare, Edna Regina

; Fonseca, Francisco Antonio Helfenstein

; Mota, Isabela Cardoso Pimentel

; Santos, José Ernesto dos

; Kato, Juliana Tieko

; Beda, Lis Mie Masuzawa

; Vieira, Lis Proença

; Bertolami, Marcelo Chiara

; Rogero, Marcelo Macedo

; Lavrador, Maria Silvia Ferrari

; Nakasato, Miyoko

; Damasceno, Nagila Raquel Teixeira

; Alves, Renato Jorge

; Roberta Soares, Lara

; Costa, Rosana Perim

; Machado, Valéria Arruda

Arquivos Brasileiros de Cardiologia

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jan 2021, Volume 116 N. 1 Pages 160 - 212

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

https://doi.org/10.36660/abc.20201340 9969 downloads

Stability of jabuticaba flakes obtained by drum drying with cassava starch as additive
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Nunes, Larissa Peixoto

; Silva, Vanessa Martins da

; Souza, Elaine de Cássia Guerreiro

; Ferrari, Cristhiane Caroline

; Germer, Silvia Pimentel Marconi

Brazilian Journal of Food Technology

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2021, Volume 24 elocation e2020085

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

Resumo A estabilidade dos flocos de jabuticaba produzidos por drum drying usando fécula de mandioca foi avaliada. Isotermas de sorção a 25 °C foram determinadas e as amostras foram armazenadas sob condições controladas (umidade relativa = 60% e temperatura = 20, 25 e 35 °C) até 235 dias. O teor de anticianinas e os parâmetros de cor (L*, a* e b*) foram monitorados. O modelo de GAB teve o melhor ajuste das isotermas de sorção, com um teor de umidade da monocamada de 0,1596 g água/g base seca. A avaliação visual das amostras não mostrou aglomeração e escurecimento para aw ≤ 0,33 a 25 °C, o que pode ser considerado o ponto crítico. A degradação de antocianinas e dos parâmetros de cor seguiu uma cinética de ordem zero e primeira ordem, respectivamente. Os tempos de meia vida (630 a 1450 dias) apresentaram boa estabilidade a 25 °C, enquanto que os valores do fator de aceleração das reações com a temperatura (2,2 ≤ Q10 ≤ 3,2) e a energia de ativação (15 ≤ Ea ≤ 19 kcal/mol) demonstraram uma alta sensibilidade do produto com a temperatura.

Abstract The stability of jabuticaba flakes produced by drum drying using cassava starch as additive was evaluated. Sorption isotherms at 25 ºC were determined. Samples were stored under controlled conditions (relative humidity = 60%, temperature = 20, 25 and 35 ºC) for until 235 days. The anthocyanin content and color parameters (L*, a* and b*) were monitored. GAB model led to the best adjustment of sorption isotherm, with a monolayer moisture value of 0.1596 g water/g dry basis. The visual observations did not point out agglomerations and darkening at aw values higher than 0.33 at 25 ºC, which can be considered the critical point. The degradation of anthocyanin and color parameters followed first and zero-order kinetic model, respectively. The half-life times (630 to 1450 days) showed good stability at 25 ºC, while the temperature acceleration coefficient (2.2 ≤ Q10 ≤ 3.2) and activation energy (15 ≤ Ea ≤ 19 kcal/mol) values demonstrated a high-temperature sensitivity.

https://doi.org/10.1590/1981-6723.08520 118 downloads

Decompensated Heart Failure with Mid-Range Ejection Fraction: Epidemiology and In-Hospital Mortality Risk Factors
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Cavalcanti, Gabriela Paiva

; Sarteschi, Camila

; Gomes, Glory Eithne Sarinho

; Medeiros, Carolina de Araújo

; Pimentel, José Henrique Martins

; Lafayette, André Rabelo

; Almeida, Maria Celita

; Oliveira, Paulo Sérgio Rodrigues

; Martins, Silvia Marinho

International Journal of Cardiovascular Sciences

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feb 2020, Volume 33 N. 1 Pages 45 - 54

Abstract: En | Text: En | PDF: En

Abstract Background: Recently, a new HF entity, with LVEF between 40-49%, was presented to comprehend and seek better therapy for HF with preserved LVEF (HFpEF) and borderline, in the means that HF with reduced LVEF (HFrEF) already has well-defined therapy in the literature. Objective: To compare the clinical-therapeutic profile of patients with HF with mid-range LVEF (HFmrEF) with HFpEF and HFrEF and to verify predictors of hospital mortality. Method: Historical cohort of patients admitted with decompensated HF at a supplementary hospital in Recife/PE between April/2007 - August/2017, stratified by LVEF (< 40%/40 - 49/≥ 50%), based on the guideline of the European Society of Cardiology (ESC) 2016. The groups were compared and Logistic Regression was used to identify predictors of independent risk for in-hospital death. Results: A sample of 493 patients, most with HFrEF (43%), HFpEF (30%) and HFmrEF (26%). Average age of 73 (± 14) years, 59% men. Hospital mortality 14%, readmission within 30 days 19%. In therapeutics, it presented statistical significance among the 3 groups, spironolactone, in HFrEF patients. Hospital death and readmission within 30 days did not make difference. In the HFmrEF group, factors independently associated with death were: valve disease (OR: 4.17, CI: 1.01-9.13), altered urea at admission (OR: 6.18, CI: 1.78-11.45) and beta-blocker hospitalization (OR: 0.29, CI: 0.08-0.97). In HFrEF, predictors were: prior renal disease (OR: 2.84, CI: 1.19-6.79), beta-blocker at admission (OR: 0.29, CI: 0.12-0.72) and ACEI/ ARB (OR: 0.21, CI: 0.09-0.49). In HFpEF, only valve disease (OR: 4.61, CI: 1.33-15.96) and kidney disease (OR: 5.18, CI: 1.68-11.98) were relevant. Conclusion: In general, HFmrEF presented intermediate characteristics between HFrEF and HFpEF. Independent predictors of mortality may support risk stratification and management of this group.

https://doi.org/10.5935/2359-4802.20190075 466 downloads

Drum drying process of jabuticaba pulp using corn starch as an additive
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Nunes, Larissa Peixoto

; Ferrari, Cristhiane Caroline

; Ito, Danielle

; Souza, Elaine de Cássia Guerreiro

; Germer, Silvia Pimentel Marconi

Brazilian Journal of Food Technology

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2020, Volume 23 elocation e2019166

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

Resumo A jabuticaba é uma fruta nativa do Brasil, muito apreciada pelo sabor, sendo também muito nutritiva. No entanto, é sazonal e altamente perecível. Portanto, a secagem é uma alternativa que se apresenta para conservação e mais oferta. O presente estudo teve por objetivo empregar o drum drying na obtenção de flocos de jabuticaba, utilizando amido de milho regular como agente carreador principal. Objetivaram-se, também, o levantamento da isoterma de sorção dos flocos (a 25 °C) e, por modelos matemáticos, a determinação da condição crítica de armazenamento, bem como do tempo de vida útil por meio da permeabilidade de diferentes embalagens ao vapor de água. As condições do drum drying foram: temperatura de 144 °C; tempo de residência de 18 segundos, adição de 20% (base seca) de amido de milho regular e 0,5% (b.s.) de monoestearato de glicerila. O produto final foi analisado quanto a suas propriedades físico-químicas e tecnológicas. Determinou-se a isoterma de sorção dos flocos a 25 °C, empregando-se o método gravimétrico com soluções saturadas (0,11 ≤ aw ≤ 0,84). No processo, os flocos apresentaram boa retenção de antocianinas e de compostos fenólicos totais, além de alta atividade antioxidante. A solubilidade em água do produto foi em torno de 70% e a higroscopicidade, de aproximadamente 24%. Os pontos experimentais de equilíbrio da isoterma foram mais bem ajustados pelo modelo de GAB, com valor de umidade da monocamada de 12,74% e aw crítica de 0,432.

Abstract Jabuticaba is a fruit native to Brazil, appreciated for its flavor and is also very nutritious, but it is a seasonal fruit and highly perishable. Therefore, drying is a good alternative for its conservation. The purpose of this work was to use drum drying to obtain jabuticaba flakes using corn starch as the main carrier agent. The sorption isotherm of the flakes at 25 °C was also studied, as well as the determination of the critical storage condition and the estimation of product shelf life through the permeability of different packages to the water vapor using mathematical models. The drum drying conditions were: temperature of 144 °C; residence time of 18 seconds; addition of 20% (dry basis) of corn starch and 0.5% (d.b.) of glyceryl monostearate. The final product was analyzed with respect to its physicochemical and technological properties. The sorption isotherm of the flakes was determined at 25 °C, using the gravimetric method with saturated solutions (0.11 ≤ aw ≤ 0.84). After the process, the flakes presented good retention of anthocyanins and total phenolic compounds, besides a high antioxidant activity. The water solubility of the product was around 70% and the hygroscopicity was approximately 24%. The equilibrium experimental points of the isotherm were better adjusted by the GAB model, with a monolayer moisture value of 12.74% (w.b) and a critical aw of 0.432.

https://doi.org/10.1590/1981-6723.16619 1360 downloads

Comparative cytogenetics of nine populations of the Rhinella genus (Anura, Bufonidae) with a highlight on their conservative karyotype
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Bruschi, Daniel Pacheco

; Sousa, Deborah Yasmim

; Soares, Amanda

; Carvalho, Klélia Aparecida de

; Busin, Carmen Sílvia

; Ficanha, Natália Cristine

; Lima, Albertina Pimentel

; Andrade, Gilda Vasconcellos

; Recco-Pimentel, Shirlei Maria

Genetics and Molecular Biology

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jun 2019, Volume 42 N. 2 Pages 445 - 451

Abstract: En | Text: En | PDF: En

Abstract The genus Rhinella is one of the most diverse groups of bufonid toads, currently composed by 93 valid species and naturally distributed throughout different Neotropical ecoregions. Here, we analyze nine Brazilian populations of toads representing species of the Rhinella margaritifera and Rhinella marina groups. These new data include the first description of the R. hoogmoedi and R. proboscidae karyotypes, as well as other taxonomically unresolved forms. Chromosomal analysis of the populations revealed pronounced chromosomal uniformity (2n=22), including the diploid number and chromosomal morphology. Three different NOR-bearing chromosomes were identified: in the subterminal region of pair 10q in R. hoogmoedi, Rhinella sp. 1 and Rhinella sp. 2, in subterminal region of 7p in R. proboscidae and Rhinella cf. margaritifera while in R. henseli and R. icterica was detected in interstitial region of 7p. Karyotypic uniformity of the genus permits the inference of interspecific chromosome homologies and evolutionary changes in the NOR-bearing chromosome may represent an informative character in species group level. The review of the cytogenetic data of the Rhinella species together with the new karyotypes reported here contributes to the understanding of the chromosomal evolution of these toads, which karyotypes are highly conserved despite the ample distribution of many forms.

https://doi.org/10.1590/1678-4685-gmb-2018-0139 932 downloads

10.

Decompensated Heart Failure with Mid-Range Ejection Fraction: Epidemiology and In-Hospital Mortality Risk Factors
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Cavalcanti, Gabriela Paiva

; Sarteschi, Camila

; Gomes, Glory Eithne Sarinho

; Medeiros, Carolina de Araújo

; Pimentel, José Henrique Martins

; Lafayette, André Rabelo

; Almeida, Maria Celita

; Oliveira, Paulo Sérgio Rodrigues

; Martins, Silvia Marinho

International Journal of Cardiovascular Sciences

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2019, N. ahead

Abstract: En | Text: En | PDF: En

https://doi.org/10.5935/2359-4802.20190075 313 downloads

11.

Síntese de óxidos mistos AMn2O4 (A=Co, Cu e Ni) preparados por autocombustão para controle de emissões de compostos orgânicos voláteis
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Moraes, Alanna Silveira de

; Poncinelli, Gabriela de Oliveira Castro

; Fávaro, Silvia Luciana

; Monteiro, Luciane Pimentel Costa

; Simões, Rita de Cassia Colman

Matéria (Rio de Janeiro)

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2019, Volume 24 N. 1 elocation e-12307

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

RESUMO Os compostos orgânicos voláteis (COVs) são substâncias que possuem elevada pressão de vapor e baixa solubilidade em água e são reconhecidos por serem um dos maiores responsáveis pela poluição atmosférica, tanto por sua natureza tóxica quanto por serem os precursores do ozônio e do smog fotoquímico. O objetivo deste trabalho foi sintetizar óxidos mistos sob as mesmas condições de preparação e avaliar suas propriedades e atividade, visando a obtenção de catalisadores eficientes do ponto de vista ambiental naoxidação do tolueno, que constitui um dos COVs mais abundantes na atmosfera. Óxidos com estrutura de espinélio AMn2O4 (A=Co, Cu e Ni) foram preparados pelo método de autocombustão sob as mesmas condições de síntese e suas propriedades físico químicas foram avaliadas por DRX, BET, FTIR e MEV. A relação entre as propriedades a as atividades dos espinélios na oxidação do tolueno foi avaliada e os catalisadores de Cu e Co foram os mais promissores, com conversões de 99 e 92%, respectivamente. Esta maior atividade foi atribuída ao possível efeito sinérgico entre o Mn3+ e as fases Co2+ e Cu2+ presentes nas estruturas dos óxidos. Não foi verificada relação direta entre os resultados obtidos para a atividade e área específica.

ABSTRACT Volatile organic compounds (VOCs) have a high vapor pressure and low water solubility and are recognized either as major contributors of air pollution either, through their toxic nature, or as precursors of ozone and photochemical smog. The objectives of this work were to synthesize several manganite oxides under the same preparation conditions and the study of their properties and activities to develop as friendly environmental catalysts in oxidation of toluene, the VOC more abundant in the Earth's atmosphere. AMn2O4 (A=Co, Ni, Cu) manganite spinels were prepared by using by using auto combustion method under the same synthesis conditions and their physico-chemical properties were studied by XRD, BET, FTIR and MEV. The relationship between the properties and activity of spinels in oxidation of toluene was investigated. Among all, Cu and Co catalysts exhibited the most promising activity, converting 92 and 99%, respectively. The higher activity was explained in terms of the possible synergetic effect between Mn3+ and Co2+, Cu2+ phases in that manganite oxides. No direct relationship was resulted between activity with either specific surface area.

https://doi.org/10.1590/s1517-707620190001.0663 1032 downloads

12.

Consumo de suplemento de hierro reportado por padres de niños de 6 a 23 meses en Perú, 2015-2016
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Gómez-Guizado, Guillermo L.

; Rosales-Pimentel, Silvia

; Cruz-Egoavil, Lucy De la

; Rojas-Macedo, José

; Chávez-Ochoa, Héctor

Revista Peruana de Medicina Experimental y Salud Pública

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sep 2018, Volume 35 N. 3 Pages 531 - 532

Abstract: Es | Text: Es | PDF: Es

https://doi.org/10.17843/rpmesp.2018.353.3253 19 downloads

13.

Consumo de suplemento de hierro reportado por padres de niños de 6 a 23 meses en Perú, 2015-2016
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Gómez-Guizado, Guillermo L.

; Rosales-Pimentel, Silvia

; De la Cruz-Egoavil, Lucy

; Rojas-Macedo, José

; Chávez-Ochoa, Héctor

Revista Peruana de Medicina Experimental y Salud Publica

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jul 2018, Volume 35 N. 3 Pages 531 - 532

Abstract: Es | Text: Es | PDF: Es

https://doi.org/10.17843/rpmesp.2018.353.3253

14.

Crop residue harvest for bioenergy production and its implications on soil functioning and plant growth: A review
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Cherubin, Maurício Roberto

; Oliveira, Dener Márcio da Silva

; Feigl, Brigitte Josefine

; Pimentel, Laisa Gouveia

; Lisboa, Izaias Pinheiro

; Gmach, Maria Regina

; Varanda, Letícia Leal

; Morais, Maristela Calvente

; Satiro, Lucas Santos

; Popin, Gustavo Vicentini

; Paiva, Sílvia Rodrigues de

; Santos, Arthur Klebson Belarmino dos

; Vasconcelos, Ana Luisa Soares de

; Melo, Paul Lineker Amaral de

; Cerri, Carlos Eduardo Pellegrino

; Cerri, Carlos Clemente

Scientia Agricola

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may 2018, Volume 75 N. 3 Pages 255 - 272

Abstract: En | Text: En | PDF: En

ABSTRACT: The use of crop residues as a bioenergy feedstock is considered a potential strategy to mitigate greenhouse gas (GHG) emissions. However, indiscriminate harvesting of crop residues can induce deleterious effects on soil functioning, plant growth and other ecosystem services. Here, we have summarized the information available in the literature to identify and discuss the main trade-offs and synergisms involved in crop residue management for bioenergy production. The data consistently showed that crop residue harvest and the consequent lower input of organic matter into the soil led to C storage depletions over time, reducing cycling, supply and availability of soil nutrients, directly affecting the soil biota. Although the biota regulates key functions in the soil, crop residue can also cause proliferation of some important agricultural pests. In addition, crop residues act as physical barriers that protect the soil against raindrop impact and temperature variations. Therefore, intensive crop residue harvest can cause soil structure degradation, leading to soil compaction and increased risks of erosion. With regard to GHG emissions, there is no consensus about the potential impact of management of crop residue harvest. In general, residue harvest decreases CO2 and N2O emissions from the decomposition process, but it has no significant effect on CH4 emissions. Plant growth responses to soil and microclimate changes due to crop residue harvest are site and crop specific. Adoption of the best management practices can mitigate the adverse impacts of crop residue harvest. Longterm experiments within strategic production regions are essential to understand and monitor the impact of integrated agricultural systems and propose customized solutions for sustainable crop residue management in each region or landscape. Furthermore, private and public investments/cooperations are necessary for a better understanding of the potential environmental, economic and social implications of crop residue use for bioenergy production.

https://doi.org/10.1590/1678-992x-2016-0459 9203 downloads

15.

Histological analysis of the use of biphasic ceramics based on hydroxyapatite and β-tricalcium phosphate in maxillary sinus floor elevation surgery: pilot study
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PADOVAN, Luis Eduardo Marques

; GARCIA E SOUSA, Diego

; PADOVAN, Silvia Helena Marques

; LOPES DE OLIVEIRA, Guilherme José Pimentel

; SILVA, Ricarda Duarte da

; CLAUDINO, Marcela

Revista de Odontologia da UNESP

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mar 2018, Volume 47 N. 2 Pages 63 - 68

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

Resumo Objetivo Avaliar o reparo ósseo associado ao uso da cerâmica bifásica a base de hidroxiapatita e β-tricálcio fosfato (HA/TCP) nos procedimentos de elevação da membrana do seio maxilar em humanos. Material e método Foram selecionados 10 pacientes com rebordo ósseo residual entre 3 mm e 5 mm de altura na região posterior da maxila e que tinham indicação para procedimentos de enxertia óssea associado ao levantamento de seio maxilar. Os seios maxilares foram preenchidos com HA/TCP, e após 8 meses, foi executado a instalação dos implantes e nesse momento foi realizada a coleta de um fragmento ósseo com auxílio de uma broca trefina, o qual foi submetido à análise histológica da área enxertada. Resultado A análise histológica das biópsias revelou a presença de tecido ósseo vital e imaturo, justaposto ao biomaterial. A análise histomorfométrica revelou percentuais de 28,8%, 27,4% e 43,6% para tecido ósseo, biomaterial e tecido mole, respectivamente. Conclusão As áreas enxertadas com a HA/TCP apresentaram quantidade adequada de formação óssea que permitiu a instalação dos implantes. O sucesso do procedimento de enxertia com esse biomaterial esteve associado ao seu potencial de osteocondução que permitiu a formação de tecido ósseo em íntimo contato com a HA/TCP.

Abstract Objective To evaluate the bone repair associated with the use of biphasic ceramics based on hydroxyapatite and β-tricalcium phosphate (HA/TCP) in the procedures of maxillary sinus membrane elevation in human beings. Material and method Ten patients with a residual bone ridge in the posterior maxillary region between 3 mm and 5 mm in height were selected and indicated for procedures of bone grafting associated with maxillary sinus lift procedure. The maxillary sinuses were filled with HA/TCP, and after 8 months, the implants were implanted and a bone biopsy was collected with the aid of a trephine drill, which was then submitted to histological analysis for the evaluation of the composition of the grafted area. Result The histological description analysis of the biopsies revealed the presence of vital and immature bone tissue, juxtaposed to the biomaterial. Histomorphometric analysis showed that the biopsy composition was in average 28.8%, 27.4%, and 43.6% of bone tissue, biomaterial, and soft tissue, respectively. Conclusion The areas grafted with HA/TCP presented the adequate amount of bone formation that allowed the implantation of the implants. The success of the grafting procedure with this biomaterial was associated with its osteoconduction potential that allowed the formation of bone tissue in close contact with HA/TCP.

https://doi.org/10.1590/1807-2577.10917 1150 downloads

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