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Among stimulant drugs, cocaine deserves attention due to its high rates of seizures worldwide. This work presents the synthesis and characterization of hybrid molecularly imprinted polymers (MIPs) for use in preparing biological samples using a homemade microextraction in a packed sorbent device to extract cocaine. The MIPs synthesized using caffeine and cocaine as templates have been compared. Caffeine was used due to its low value and be easier to obtain than cocaine. Additionally, restricted access molecularly imprinted polymers (RAMIPs) were also produced for comparison purposes. The polymeric materials were characterized using scanning electron microscopy, textural analysis, Fourier transform infrared spectroscopy, and cross polarization/ magic angle spinning 13C nuclear magnetic resonance. The method optimization was performed using linear ion trap mass spectrometer to evaluate the effects of sample pH, type of eluent, washing solvent, adsorption cycles, and eluent volume. In the optimized method, RAMIPs indicated better cocaine extraction compared to MIPs. The quantitative study demonstrated that the developed method was able to accurately quantify cocaine in urine samples with values close to actual concentrations. drugs worldwide (MIPs Additionally (RAMIPs purposes microscopy analysis spectroscopy polarization C resonance pH solvent cycles volume concentrations

https://doi.org/10.21577/0103-5053.20230103

COMBINING DIFFERENT CONCURRENT TRAINING METHODS IN OLDER ADULTS WITH METABOLIC SYNDROME
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Da Silva, Marco Antônio R.

; França, Elias de

; Baptista, Liliana C.

; Neves, Rafael S.

; Loureiro, Helena

; Caperuto, Erico C.

; Veríssimo, Manuel T.

; Martins, Raul A.

Revista Brasileira de Medicina do Esporte

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Ago 2022, Volumen 28 Nº 4 Paginas 267 - 273

Resumen: Pt En Es | Texto: Pt En Es | PDF: Pt | PDF: En | PDF: Es

RESUMO Introduction: Introdução: Não há estudos que comparem diferentes rotinas de treinamentos concorrentes [isto é, programa de treinamento resistido mais treinamento intervalado de alta intensidade (TR+HIIT) ao TR mais treinamento contínuo de intensidade moderada (TR+MICT)] na aptidão cardiorrespiratória (ACR) e desempenho físico em idosos com síndrome metabólica (SM). Objetivos: O objetivo deste estudo foi comparar os efeitos de duas rotinas de treinamentos concorrentes (TR+HIIT vs. TR+MICT) na ACR e aptidão física em adultos e idosos com SM. Métodos: Trinta e nove participantes (67,0 ± 6,7 anos) foram divididos randomicamente em três grupos: TR+MICT, TR+HIIT e grupo controle (CON, sem exercício). O programa de treinamento físico de 12 semanas consistiu em 3 sessões/semana (~ 50 minutos/sessão). O componente de treinamento aeróbico (HIIT ou MICT) foi adaptado para gasto energético isocalórico (P ≥ 0,217) e distribuição de isocarga (TRIMP; P ≥ 0,893), porém, o componente MICT teve tempo de treinamento aeróbico maior (P ≤ 0,01). Avaliamos a ACR pré e pós-intervenção (VO2pico), capacidade física (potência de membros inferiores [PMI], velocidade de corrida e tempo de corrida até a exaustão), lactato plasmático, percepção subjetiva de esforço (PSE), frequência cardíaca de repouso (FCrepouso) e máxima (FCpico). Resultados: No final da intervenção, somente o grupo TR+HIIT teve aumento significativo do VO2pico (P = 0,01), mas em comparação com o grupo CON, ambos os grupos TR+HIIT e TR+MICT tiveram melhora significativa do VO2pico (P ≤ 0,02). Somente o grupo TR+HIIT mostrou FCrepouso menor em comparação com o basal e com o grupo CON. Além disso, os grupos TR+HIIT e TR+MICT, mas não o grupo CON, tiveram melhora significativa da velocidade de corrida, do tempo até a exaustão e da PMI (P < 0,05). Não houve alterações significativas em FCpico, PSE e lactato em nenhum dos grupos. Conclusão: Nossos resultados sugerem que 12 semanas de TR+MICT ou TR+HIIT melhoram o desempenho físico dos membros inferiores. Além disso, nossos resultados sugerem que TR+HIIT fornece benefícios adicionais de ACR em idosos com SM. Nível de evidência II; Estudo Experimental Randomizado.

ABSTRACT Introduction: There are no studies comparing the effects of different concurrent training routines [i.e., a resistance training plus high-intensity interval training (RT+HIIT) program compared to an RT plus moderate-intensity continuous training (RT+MICT) program] on cardiorespiratory fitness (CRF) and physical performance in older adults with metabolic syndrome (MetS). Objective: This study aimed to compare the effects of two concurrent training routines, RT+HIIT versus RT+MICT, on CRF and physical fitness in adults and older adults with MetS. Methods: Thirty-nine participants (67.0±6.7 years of age) were randomly assigned into three groups: RT+ MICT, RT+ HIIT and the control group (CON, no exercise). The 12-week physical training program consisted of 3 sessions/week (~50 minutes/session). The aerobic training component was customized for iso-caloric energy expenditure (P≥0.217) and iso-load distribution (TRIMP, P≥0.893), however the MICT component had a longer aerobic training time (P≤0.01). We evaluated pre- and post-evaluation CRF (VO2peak), physical capacity [power of lower limbs (PLL), running velocity, and running time to exhaustion], plasma lactate, rate of perceived exertion (RPE), resting heart rate (HRrest), and peak heart rate (HRpeak). Results: At the end of the intervention, a significant increase in the VO2peak was observed only in the RT+HIIT group (P=0.01), but compared to the CON group both RT+HIIT and RT+MICT groups had significant improvement in the VO2peak (P≤0.02). Only the RT+HIIT group had lower HRrest as compared to the baseline and the CON group. Also, both RT+HIIT and RT+MICT groups, but not CON, significantly improved running speed, time to exhaustion, and PLL (P<0.05). There were no significant changes in HRpeak, RPE, and lactate for any of the groups. Conclusion: Our results suggest that 12 weeks of RT+MICT or RT+HIIT improve lower-limb physical performance. Also, our results suggest that RT+HIIT provides additional CRF benefits in older adults with MetS. Level of evidence II; Randomized Experimental Study.

RESUMEN Introducción: No hay estudios que comparen diferentes rutinas de entrenamientos concurrentes [es decir, programa del entrenamiento de resistencia (ER) más entrenamiento de intervalos de alta intensidad (ER+HIIT) con el ER más entrenamiento continuo de intensidad moderada (ER+ECIM) en la aptitud cardiorrespiratoria (ACR) y desempeño físico en ancianos con síndrome metabólico (SM). Objetivo: El objetivo de este estudio fue comparar los efectos de dos rutinas de entrenamientos concurrentes (ER+HIIT sobre ER+ECIM) sobre la ACR y aptitud física en ancianos con SM. Método: Treinta y nueve participantes (67,0±6,7 años) fueron divididos aleatoriamente en 3 grupos: ER+ECIM, ER+HIIT y grupo de control (CON, sin ejercicio). El programa de entrenamiento físico de 12 semanas consistió en 3 sesiones semanales (50 minutos/sesión). En componente de entrenamiento aeróbico HIIT o ECIM se igualó en cuanto al gasto energético isocalórico (P≥0,217) y la distribución de isocarga (TRIMP; P≥0,893), sin embargo, el componente ECIM tuvo un mayor tiempo de entrenamiento aeróbico (P≤0,01). Se evaluó la ACR antes y después de la intervención (VO2pico), la capacidad física (potencia de las extremidades inferiores [PEI], la velocidad, y el tiempo hasta el agotamiento), el lactato plasmático y percepción subjetiva del esfuerzo (RPE), la frecuencia cardíaca en reposo HRest) y máxima (FCpico). Resultados: Al final de la intervención, solo el grupo ER+HIIT presentó un aumento significativo del VO2pico (P=0,01), pero en comparación con el grupo CON, tanto el grupo ER+HIIT como el ER+ECIM presentaron una mejora significativa l del VO2pico (P ≤ 0,02).. Sólo el grupo ER+HIIT demostró una HRest menor en comparación con el nivel de referencia y el grupo CON. Además, los grupos ER+HIIT y ER+ECIM, pero no el grupo CON, tuvieron una mejora significativa en la velocidad de carrera, el tiempo hasta el agotamiento y la PEI (P<0,05). No hubo cambios significativos en FCpico, RPE y lactato para ninguno de los grupos. Conclusión: Nuestros resultados sugieren que 12 semanas de ER+ECIM o ER+HIIT mejoran el rendimiento físico de las extremidades inferiores. Además, sugieren que ER+HIIT proporciona beneficios adicionales en la ACR en ancianos con SM. Nivel de evidencia II;Estudio experimental aleatorio

https://doi.org/10.1590/1517-8692202228042020_0122

Microstructure and diametral fracture strength of spark plasma sintered WC-6Co-0.2B and WC-6Co-0.5B ceramic composites from nanosized and metastable WC powders
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Silva, G. S. de Alencar e

; Leal Neto, R. M.

; Filgueira, M.

; Baptista, C. A. R. P.

; Santos, C. dos

; Ramos, A. S.

Cerâmica

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Jun 2022, Volumen 68 Nº 386 Paginas 188 - 198

Resumen: En | Texto: En | PDF: En

Abstract The present work aimed at evaluating the microstructures and mechanical properties of spark plasma sintered WC-6 wt% Co ceramic composites doped with boron (0.2 and 0.5 wt%). W-50 at% C (W-6.13 wt% C) powders produced under different milling times (20, 60, 180, and 600 min) were used as starting materials and subsequently mixed with Co (6 wt%) and B (0.2 or 0.5 wt%) powders for 5 min. The resultant WC-Co-B powder mixtures were consolidated by spark plasma sintering at 1450 °C for 10 min at 40 MPa under vacuum in order to obtain the samples with 10 mm diameter and 3 mm thickness. The starting powders and the sintered samples were characterized by laser diffraction particle size analysis, X-ray diffraction with Rietveld refinement, relative density, scanning electron microscopy, energy dispersive spectrometry, Vickers hardness test, and diametral compression test. Supersaturated W solid solution (WSS) with a crystallite size of <50 nm was formed in W-50C (at%) powder mixtures. The relative density of the sintered composites increased with the increasing milling time up to 180 min from 79.7%±0.6% to 86.7%±0.5% for WC-6Co-0.2B and from 86.7%±0.6% to 90.9%±0.4% for WC-6Co-0.5B. Furthermore, the WC phase appeared as the matrix in the sintered samples, and W2CoB2 precipitated homogeneously around WC grain boundaries, mainly to those containing 0.5% B. The Vickers hardness values of the sintered WC-6Co-0.2B and WC-6Co-0.5B ranged from 1790±39 to 2158±25 HV and 1858±31 to 2182±28 HV, respectively. The fracture strength (determined by diametral compression test) varied between 144-353 MPa due to the porosity and precipitates in thin-thickness cylinder samples.

https://doi.org/10.1590/0366-69132022683863210

Upconversion 3D Printed Composite with Multifunctional Applications for Tissue Engineering and Photodynamic Therapy
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Nigoghossian, Karina

; Saska, Sybele

; Christovam, Livia M.

; Coelho, Fernanda

; Beatrice, Cesar Augusto G.

; Lucas, Alessandra A.

; Neto, Paulo I.

; Silva, Jorge Vicente L. da

; Tercjak, Agnieszka

; Baptista, Maurício S.

; Catalani, Luiz Henrique

; Scarel-Caminaga, Raquel M.

; Capote, Ticiana S. O.

; Ribeiro, Sidney José L.

Journal of the Brazilian Chemical Society

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Abr 2020, Volumen 31 Nº 4 Paginas 638 - 652

Resumen: En | Texto: En | PDF: En

Upconversion nanoparticles (UCNPs) are suitable materials for bioapplications due to their ability to emit visible light under near infrared (NIR) excitation, in the biological transparency range. Polycaprolactone(PCL)-based scaffolds are widely used in tissue engineering in combination with inorganic compounds to improve bioactivity and osteoconductive properties. This work proposes a 3D printed composite scaffold with upconversion property aiming at biomedical applications in therapy-stimulated bone repair and photodynamic therapy (PDT). The system combines PCL polymer, UCNPs-apatite and a PDT photosensitizer. Thermal and rheological behaviors of the composite were similar to pure PCL polymer. Mechanical properties were improved by adding UCNPs-apatite. The 3D printable composite presented upconversion property and potential for PDT application, which was demonstrated by singlet oxygen generation under 980 nm excitation. Cytotoxicity, genotoxicity and mutagenicity assays indicated no toxicological effects at low concentrations of rare earth elements. Taken together, a potential multifunctional material is proposed for biomedical applications.

https://doi.org/10.21577/0103-5053.20190228 489 descargas

Where do we aspire to publish? A position paper on scientific communication in biochemistry and molecular biology
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Baptista, M.S.

; Alves, M.J.M.

; Arantes, G.M.

; Armelin, H.A.

; Augusto, O.

; Baldini, R.L.

; Basseres, D.S.

; Bechara, E.J.H.

; Bruni-Cardoso, A.

; Chaimovich, H.

; Colepicolo Neto, P.

; Colli, W.

; Cuccovia, I.M.

; Da-Silva, A.M.

; Di Mascio, P.

; Farah, S.C.

; Ferreira, C.

; Forti, F.L.

; Giordano, R.J.

; Gomes, S.L.

; Gueiros Filho, F.J.

; Hoch, N.C.

; Hotta, C.T.

; Labriola, L.

; Lameu, C.

; Machini, M.T.

; Malnic, B.

; Marana, S.R.

; Medeiros, M.H.G.

; Meotti, F.C.

; Miyamoto, S.

; Oliveira, C.C.

; Souza-Pinto, N.C.

; Reis, E.M.

; Ronsein, G.E.

; Salinas, R.K.

; Schechtman, D.

; Schreier, S.

; Setubal, J.C.

; Sogayar, M.C.

; Souza, G.M.

; Terra, W.R.

; Truzzi, D.R.

; Ulrich, H.

; Verjovski-Almeida, S.

; Winck, F.V.

; Zingales, B.

; Kowaltowski, A.J.

Brazilian Journal of Medical and Biological Research

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2019, Volumen 52 Nº 9 elocation e8935

Resumen: En | Texto: En | PDF: En

The scientific publication landscape is changing quickly, with an enormous increase in options and models. Articles can be published in a complex variety of journals that differ in their presentation format (online-only or in-print), editorial organizations that maintain them (commercial and/or society-based), editorial handling (academic or professional editors), editorial board composition (academic or professional), payment options to cover editorial costs (open access or pay-to-read), indexation, visibility, branding, and other aspects. Additionally, online submissions of non-revised versions of manuscripts prior to seeking publication in a peer-reviewed journal (a practice known as pre-printing) are a growing trend in biological sciences. In this changing landscape, researchers in biochemistry and molecular biology must re-think their priorities in terms of scientific output dissemination. The evaluation processes and institutional funding for scientific publications should also be revised accordingly. This article presents the results of discussions within the Department of Biochemistry, University of São Paulo, on this subject.

https://doi.org/10.1590/1414-431x20198935 1769 descargas

The E3 ligase MuRF2 plays a key role in the functional capacity of skeletal muscle fibroblasts
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Silvestre, J.G.

; Baptista, I.L.

; Silva, W.J.

; Cruz, A.

; Silva, M.T.

; Miyabara, E.H.

; Labeit, S.

; Moriscot, A.S.

Brazilian Journal of Medical and Biological Research

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2019, Volumen 52 Nº 9 elocation e8551

Resumen: En | Texto: En | PDF: En

Fibroblasts are a highly heterogeneous population of cells, being found in a large number of different tissues. These cells produce the extracellular matrix, which is essential to preserve structural integrity of connective tissues. Fibroblasts are frequently engaged in migration and remodeling, exerting traction forces in the extracellular matrix, which is crucial for matrix deposition and wound healing. In addition, previous studies performed on primary myoblasts suggest that the E3 ligase MuRF2 might function as a cytoskeleton adaptor. Here, we hypothesized that MuRF2 also plays a functional role in skeletal muscle fibroblasts. We found that skeletal muscle fibroblasts express MuRF2 and its siRNA knock-down promoted decreased fibroblast migration, cell border accumulation of polymerized actin, and down-regulation of the phospho-Akt expression. Our results indicated that MuRF2 was necessary to maintain the actin cytoskeleton functionality in skeletal muscle fibroblasts via Akt activity and exerted an important role in extracellular matrix remodeling in the skeletal muscle tissue.

https://doi.org/10.1590/1414-431x20198551 790 descargas

Differential vineyard fertilizer management based on nutrient,s spatio-temporal variability
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Serrano, João

; Silva, J. Marques da

; Shahidian, S.

; Silva, L.L.

; Sousa, A.

; Baptista, F.

Journal of soil science and plant nutrition

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Mar 2017, Volumen 17 Nº 1 Paginas 46 - 61

Resumen: En | Texto: En | PDF: En

Conventionally, vineyard fertilizer management has been based on information from composite soil samples and no account has been taken of the existing spatial variability in soil fertility. This study presents a quantitative analysis of soil phosphorus (P2O5) and potassium (K2O) content as well as pH carried out in an 80 ha vineyard, during 2011 and 2013 in order to identify their spatial variability and temporal stability. Additionally a quantitative analysis of plant P2O5 and K2O content was carried out in 2013 with the objective of evaluating the spatial variability of plant nutrients.In 2013 a contact sensor was used to survey soil apparent electrical conductivity (ECa) and an active optical sensor was used to measure the plant Normalized Difference Vegetation Index (NDVI). The results showed a low potential for implementing site-specific management of phosphorus fertilizer but an interesting potential for implementing site-specific management of potassium fertilizer and pH correction. The concentration of P2O5 and K2O in the plant showed a CV<30%, with adequate values in almost the entire area of the field, in contrast to the concentration of these main macronutrients in the topsoil. These results show that for differential nutrient management of vineyards, plant nutrient concentration is a more stable tool than soil nutrients concentration. The ECa and the NDVI presented weak correlations with soil and plant concentration of, , respectively, P2O5 and K2O, which shows that further development of vegetation operational sensors is needed to support decision making in the vineyard fertilization management.

1083 descargas

Angiosarcoma of small intestine: case report and literature review
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Lopes, Roberto Heleno

; Resende, Frederico Augustus M.

; Fraga, João Baptista P.

; Oliveira, Alexandre F.

; Pereira, Matheus S. V.

; Maciel, Bruno A. R.

; Lamim, Raul Fernando B.

Jornal Brasileiro de Patologia e Medicina Laboratorial

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Oct 2016, Volumen 52 Nº 5 Paginas 345 - 348

Resumen: Pt En | Texto: Pt En | PDF: Pt | PDF: En

RESUMO Introdução: Angiossarcomas são patologias raras, e o aparecimento deles no intestino delgado é extremamente incomum. Relato de caso: Paciente do sexo feminino apresentando vômitos, cólica, distensão abdominal e irritação peritoneal. Foram realizadas laparotomia exploratória e enterectomia, evidenciando-se neoplasia vascular ao anatomopatológico e marcadores CD31, p53 e antígeno de proliferação celular Ki-67 à imuno-histoquímica. A paciente evoluiu com sarcomatose difusa e faleceu dois meses após o início dos sintomas. Conclusão: Demonstra-se a dificuldade em diagnosticar precocemente essa patologia devido à sua clínica inespecífica. A agressividade da doença, seus fatores predisponentes indeterminados e a controvérsia referente ao tratamento adequado suscitam seu péssimo prognóstico.

ABSTRACT Introduction: Angiosarcomas are rare pathologies, and their appearance in the small intestine is extremely unusual. Case report: Female patient presenting vomiting, colic, abdominal distension and peritoneal irritation. An exploratory laparotomy and an enterectomy were performed. Histopathology revealed vascular neoplasm; immunohistochemistry, markers CD31, p53 and cell proliferation antigen Ki-67. The patient developed diffuse sarcomatosis and died two months after the onset of symptoms. Conclusion: This case demonstrates the difficulty in early diagnosing this pathology, due to its nonspecific clinical presentation. The disease aggressiveness, its unestablished predisposing factors and the controversy around the adequate treatment engender the poor prognosis.

https://doi.org/10.5935/1676-2444.20160054 1006 descargas

A new species of Alpaida (Araneae, Araneidae) from Southeastern Brazil
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Castanheira, Pedro de S.

; Baptista, Renner L. C.

Iheringia. Série Zoologia

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Sep 2015, Volumen 105 Nº 3 Paginas 372 - 375

Resumen: Pt En | Texto: Pt En | PDF: Pt | PDF: En

RESUMO Alpaida venger sp. nov. é descrita baseada em machos e fêmeas do Parque Estadual da Pedra Branca, Rio de Janeiro, Brasil. Esta espécie parece relacionada a Alpaida scriba (Mello-Leitão, 1940) e Alpaida alticeps (Keyserling, 1879) devido a similaridades no formato e cor do corpo, mas é facilmente distinguida pela apófise média muito alongada, ao particular lobo do tégulo e ao paracímbio em forma de gancho do palpo do macho. Fêmeas apresentam epígino alongado como A. scriba, mas podem ser diferenciadas pelos lábios mais largos e escapo mais curto.

ABSTRACT Alpaida venger sp. nov. is described based on males and females from Pedra Branca State Park, Rio de Janeiro, Brazil. This species seems to be related to Alpaida scriba (Mello-Leitão, 1940) and Alpaida alticeps (Keyserling, 1879) due to similar body shape and color, but is easily distinguished by the very elongated median apophysis, the massive lobe of tegulum and the hooked paracymbium of male palp. Females have elongated epigyne as A. scriba, but can be distinguished by the wider lips and shorter scape.

https://doi.org/10.1590/1678-476620151053372375 1549 descargas

10.

Ecological water quality assessment in the Guapiaçu-Macacu hydrographic complex (Rio de Janeiro, Brazil) using multiple indicators
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Pereira, Priscilla S.

; Fernandes, Lia A. C.

; Dias, Roberto J. P.

; Sampaio, Marcelo S.

; Silva-Neto, Inácio D.

; Baptista, Darcilio F.

; Oliveira, Jaime L. M.

Revista Ambiente & Água

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Sep 2014, Volumen 9 Nº 3 Paginas 409 - 423

Resumen: Pt En | Texto: Pt En | PDF: Pt | PDF: En

O diagnóstico rápido da qualidade da água de cinco pontos do complexo hidrográfico Macacu-Guapiaçu foi realizado utilizando protocolo de avaliação visual (PAV), análises convencionais, composição e estrutura do grupo de ciliados e a ocorrência de macroinvertebrados bentônicos. Foram realizadas coletas de amostras da água em cinco pontos amostrais (A - E) em julho de 2010. Os protistas foram amostrados com auxílio de substratos artificiais e os macroinvertebrados utilizando método multi-habitat. Foram registrados 22 táxons de protozoários e 51 táxons de macroinvertebrados nas cinco amostras. O ponto de referência (A) apresentou maior diversidade de protistas e maiores índices BMWP-CETEC e IBE-IOC em relação aos grupos de macroinvertebrados. Os trechos mais impactados apresentaram menor diversidade e maior abundância de protozoários bem como menores valores para os índices. Os quatro métodos utilizados foram convergentes ao diagnosticar os trechos de referência (A), impactado (B e E) e com grau intermediário de impacto (C e D). Além disso, estes métodos foram complementares visto que os parâmetros convencionais e a composição de ciliados foram mais sensíveis na detecção do aumento da poluição orgânica enquanto que o PAV e a ocorrência de macroinvertebrados detectaram alterações na geomorfologia e degradação do habitat.

A quick diagnosis of the ecological quality of five sections of the Macacu-Guapiaçu hydrographic complex was performed using visual assessment protocol (VAP), conventional analysis, composition and structure of ciliates and the occurrence of benthic macro invertebrates. Water samples were collected from five sampling stations (A-E) in July of 2010. Protists were sampled with aid of artificial substrates, and macro invertebrates were sampled using the multi-habitat method. A total of 22 taxa of protozoa and 51 taxa of macro invertebrates was registered at the five stations. Reference station (A) showed greater protist diversity and higher values of BMWP-CETEC and IBE-IOC indices relating to macro invertebrates. The impacted stations (B and E) presented lower diversity and higher abundance of protozoa, as well as the lowest values for the rates. The four methods used were convergent to diagnose reference station (A), the impacted stations (B and E) and those in intermediate conditions (C and D). Thus, the methods were complementary, as the conventional parameters and ciliate assembly were more sensitive to detecting the increase in organic pollution and VAP and macro invertebrate assembly detected changes in geomorphology and habitat degradation.

https://doi.org/10.4136/ambi-agua.1397 1820 descargas

11.

Fertilidade de carneiros de raça Saloia com sémen refrigerado ou congelado
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Barbas, J.

; Marques, C.

; Baptista, M.

; Mascarenhas, R.

; Pereira, R.

; Cavaco-Gonçalves, S.

; Vasques, M.

; Horta, A.

Archivos de Zootecnia

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Jun 2013, Volumen 62 Nº 238 Paginas 303 - 306

Resumen: En Pt | Texto: En Pt | PDF: En | PDF: Pt

We intend to estimate Saloia breed rams fertility and its variation coefficients (VC) after cervical artificial insemination (AI) with refrigerated (SR) or frozen semen (SC). In experiment 1, we studied the seasonal effect of AI (spring vs. autumn) on fertility (n=5 rams) using SR. The seasonal effect of semen freezing (autumn vs. winter, n=3 rams) on fertility of ewes inseminated in spring was also tested with SC. Variations in ram fertility using either SF or SC were determined independently of seasons of insemination and freezing (experiment 2: SF (n=4), SC (n=4), same rams; experiment 3: SF=16, FS=5 rams). No seasonal differences in fertility were found when ewes were inseminated either with SF or SC. Fertility was higher when RS rather than SC was used (experiment 2: 51.28 vs. 13.65 %; experiment 3: 48.51 vs. 13.04 %, respectively). Fertility VCs from SC were higher than those from SR (experiment 2: 41.3 vs. 13.1 %; experiment 3: 38.9 vs. 19.5 %, respectively). SR or SC from Saloia rams can be used in AI programs during the studied seasons with no deleterious effect on fertility. Higher fertility VCs are estimated when insemination is performed with SR, suggesting semen individual susceptibility to freezing.

Avaliaram-se as fertilidades e coeficientes de variação (CV) de carneiros Saloios após inseminação artificial (IA) por via cervical com sémen refrigerado (SR) ou congelado (SC). Na 1ª experiência avaliou-se o efeito de duas épocas de IA (primavera vs. outono) sobre a fertilidade, utilizando SR (n=5 carneiros) e de duas épocas de congelação de sémen (outono vs. inverno) sobre a fertilidade de ovelhas inseminadas na primavera utilizando SC (n=3 carneiros). Nas outras experiências avaliaram-se as variações da fertilidade de carneiros, independentemente das épocas de IA ou congelação, utilizando SR e SC (2ª experiência: 4 carneiros comuns; 3ª experiência: 16 e 5 carneiros, respectivamente). Não foram observadas diferenças na fertilidade entre épocas de IA ou congelação de sémen. As fertilidades obtidas com SR foram superiores às do SC (2ª experiência: 51,28 vs. 13,65 %; 3ª experiência: 48,51 vs. 13,04 %). Os CV da fertilidade utilizando SC foram superiores aos do SR (2ª experiência: 41,3 % vs. 13,1 %; 3ª experiência: 38,9 vs. 19,5 %). Os carneiros de raça Saloia podem ser utilizados em programas de IA com SR e SC nas épocas do ano estudadas sem diminuição da fertilidade. O SC originou CV para a fertilidade superior sugerindo diferentes susceptibilidades dos carneiros à congelação.

https://doi.org/10.4321/S0004-05922013000200018 277 descargas Citado 1 vez en SciELO

12.

Determination of Na, K, Mg and Ca in biodiesel by LS F AAS and HR-CS F AAS: studies that supported the proposal of the ABNT NBR 15556 norm
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Oliveira, Ligia C. C. de

; Vieira, Mariana A.

; Ribeiro, Anderson S.

; Baptista, Paula M.

; Gonçalves, Rodrigo A.

; Campos, Reinaldo C. de

Journal of the Brazilian Chemical Society

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Jul 2012, Volumen 23 Nº 7 Paginas 1400 - 1408

Resumen: Pt En | Texto: Pt En | PDF: Pt | PDF: En

Recentemente, a Associação Brasileira de Normas Técnicas (ABNT) lançou uma série de normas, relacionadas com a determinação de Na, K, Mg e Ca em biodiesel, recomendando procedimentos similares àqueles das normas europeias e americanas, mas também introduzindo uma norma alternativa (ABNT NBR 15556), que possibilita a determinação dos 4 elementos usando a técnica de espectrometria de absorção atômica com chama (F AAS). Neste trabalho, apresentam-se os estudos de otimização e validação que dão suporte a essa norma, bem como a comparação do desempenho de um equipamento com fonte de linhas com outro de fonte contínua. Entre os fatores otimizados, os baixos valores de taxa de aspiração e o uso de uma solução de óleo mineral em xileno para o ajuste da viscosidade entre soluções das amostras e de calibração devem ser destacados. Testes de precisão (repetitividade e precisão intermediária) mostraram valores adequados, comprovando a robustez do método, e os limites de detecção estiveram confortavelmente abaixo daqueles propugnados pelas legislações brasileira e internacional. A exatidão foi confirmada por testes de recuperação e pela participação em exercícios interlaboratoriais de proficiência promovidos pela Agência Nacional de Petróleo, Gás Natural e Biocombustíveis (ANP). A determinação dos 4 elementos por F AAS traz evidentes vantagens econômicas ao produtor, uma vez que se trata de um equipamento mais barato na sua aquisição e manutenção.

Recently, ABNT (Brazilian Association of Technical Standards) has presented a set of norms related to the determination of Na, K, Mg and Ca in biodiesel, recommending procedures similar to those of the European and American norms. However, it has also introduced an alternative norm (ABNT NBR 15556) wherein these 4 elements can be determined by flame atomic absorption spectrometry (F AAS). This work presents the studies that have supported this proposal and compares the performance of linear source equipment with a continuous source one in the application of the norm. Among the optimized factors, the low aspiration rate and the use of mineral oil solution in xylene to adjust the viscosity between samples and calibration solutions are highlighted. Precision tests (repeatability and intermediary precision) have shown adequate values, confirming the robustness of the method. Limits of detection were suitably below the legislation limits. The accuracy was confirmed by recovery tests as well as by the participation in interlaboratory proficiency tests promoted by the National Agency on Oil, Natural Gas and Biofuels (ANP, Brazil). The determination of these 4 elements by F AAS brings evident economic advantages to the producer, once F AAS is less expensive to purchase and maintenance.

4127 descargas

13.

Introduced and native Phlebobranch and Stolidobranch solitary ascidians (Tunicata: Ascidiacea) around Salvador, Bahia, Brazil
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Rocha, Rosana M.

; Bonnet, Nadia Y.K.

; Baptista, Mariah S.

; Beltramin, Fabiele S.

Zoologia (Curitiba)

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Feb 2012, Volumen 29 Nº 1 Paginas 39 - 53

Resumen: En | Texto: En | PDF: En

The Port of Salvador (12°58'S, 38°30'W) receives cargo ships from different regions such as southeast Asia, North Atlantic, Mediterranean, Africa, North and South America. Thus, the presence of this port enhances the probability of new species arriving and establishing in Todos os Santos Bay (TSB), in which the port is located. Ascidians are sessile filter-feeding invertebrates with short lived larvae and thus are good indicators of bioinvasion. We surveyed the ascidian fauna on three different occasions: August 1999, June 2004 and December 2007. Nineteen species were identified belonging to the following families: Ascidiidae (Phallusia nigra, Ascidia cf. multitentaculata, A. nordestina, A. papillata, A. scalariforme, A. cf. tapuni, A. tenue), Corellidae (Rhodosoma turcicum), Pyuridae (Microcosmus anchylodeirus, M. exasperatus, M. helleri, Pyura vittata, Herdmania pallida), and Styelidae (Polycarpa cf. reviviscens, P. spongiabilis, P. tumida, Polycarpa sp., Styela canopus, Cnemidocarpa irene). Only A. nordestina, A. papillata, A. scalariforme and P. spongiabilis are possibly native to this region, while P. tumida and C. irene were classified as introduced. Microcosmus anchylodeirus, H. pallida, P. vittata, M. exasperatus, M. helleri, S. canopus, A. cf. multitentaculata, A. tenue and P. nigra were classified as cryptogenic. Most are widely distributed in all oceans and their native geographic distribution is unknown, while A. cf. multitentaculata and A. tenue occur only in the Atlantic, with disjunct distributions. Polycarpa cf. reviviscens, P. tumida and M. anchylodeirus are registered for the first time on the coast of Brazil. Colonial ascidians from this collection are still being studied. The large number of cryptogenic and introduced species indicates the necessity of monitoring TSB for expansion of these populations and the need for the establishment of control programs.

2860 descargas

14.

Multimetric index for assessing ecological condition of running waters in the upper reaches of the Piabanha-Paquequer-Preto Basin, Rio de Janeiro, Brazil
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Baptista, Darcilio F.

; Souza, Roberta S. G. de

; Vieira, Carla A.

; Mugnai, Riccardo

; Souza, Ana S.

; Oliveira, Renata Bley S. de

Zoologia (Curitiba)

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Oct 2011, Volumen 28 Nº 5 Paginas 619 - 628

Resumen: En | Texto: En | PDF: En

The objective of this study was to develop a rapid multimetric index using benthic macrofauna as bioindicators of ecological conditions for the upper reaches of the Piabanha-Paquequer-Preto Basin located in the state of Rio de Janeiro, Brazil. A total of 33698 macroinvertebrates were collected in 27 sites. Benthic macroinvertebrates were sampled using the multi-habitat method that consists in sampling 20 m² of substrate collected in approximate proportion to the representation of all major habitat types in the reach. A subsampling procedure was used. The main steps followed to develop and test the index were: exclusion of unsuitable metrics using box-whisker plots, considering the degree of overlapping among interquartile limits (1º-3º) and confirmed by Mann-Whitney U test (p < 0.05) using six reference rivers and six impaired rivers. From all the candidate potential metrics, 36 were considered suitable. After identifying redundant metrics, through Spearman correlation analysis, and considering practical application criteria, six core metrics were selected to compose the Piabanha-Paquequer-Preto Multimetric Index (PPPMI) using the continuous method: Family richness, Shannon-Wiener family diversity, EPT family richness, %Diptera, %MOLD (Mollusca + Diptera) and %Collectors. The sensitivity of the index was tested in 15 rivers using a Principal Components Analysis (PCA) of the six environmental variables. The first axis of the PCA was highly correlated to the PPPMI scores (r = 0.703, p < 0.001). The PPPMI responded to a set of environmental variables associated to a gradient of human disturbance affecting the ecological condition of the waterbodies. This indicates that the PPPMI is an effective tool for biological monitoring and decision making in the hydrographic region of the Piabanha-Paquequer-Preto rivers.

5938 descargas

15.

Metallochlorophylls of magnesium, copper and zinc: evaluation of the influence of the first coordination sphere on their solvatochromism and aggregation properties
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Moreira, Leonardo M.

; Lima, Adriana

; Soares, Rafael R. S.

; Batistela, Vagner R.

; Gerola, Adriana P.

; Hioka, Noboru

; Bonacin, Juliano A.

; Severino, Divinomar

; Baptista, Mauricio S.

; Machado, Antônio E. da Hora

; Rodrigues, Máira R.

; Codognoto, Lúcia

; Oliveira, Hueder P. M. de

Journal of the Brazilian Chemical Society

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2009, Volumen 20 Nº 9 Paginas 1653 - 1658

Resumen: Pt En | Texto: Pt En | PDF: Pt | PDF: En

No presente estudo, o papel de diferentes centros metálicos (magnésio, zinco e cobre) sobre o caráter hidrofílico de metaloclorofilas foi avaliado. O solvatocromismo, assim como o processo de agregação para esses compostos, em misturas água/etanol foram avaliados usando medidas de fluorescência e de espalhamento de luz ressonante (ELR), visando caracterizar o comportamento desses compostos. Independente da metaloclorofila estudada, a presença de ao menos 60% de água resulta em incremento considerável na emissão de fluorescência apresentada por esses compostos. Isso, provavelmente, é uma conseqüência direta de uma menor agregação, o que é confirmado pelos resultados de ELR. Adicionalmente, os resultados sugerem que as clorofilas de magnésio e de zinco devem ser promissores agentes fototerapêuticos para emprego em Terapia Fotodinâmica.

In this study the role of different metal centers (magnesium, zinc and copper) on the enhancement of the hydrophilic character of metallochlorophylls, was evaluated. The solvatochromism as well as the aggregation process for these compounds in water/ethanol mixtures at different volume ratios were evaluated using Fluorescence, and Resonant Light Scattering (RLS) measurements, aiming to characterize the behavior of these compounds. Independently on the studied metallochlorophyll, the presence of at least 60% of water results in a considerable increase in the fluorescence emission, probably a direct consequence of a lower aggregation of these compounds, which is confirmed by the results from RLS measurements. Additionally, the results suggest that magnesium and zinc chlorophyll should be promising phototherapeutic agents for Photodynamic Therapy.

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