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ABSTRACT The expression ‘you need to know to conserve’ is a well-known cliche among biologists. Documenting the richness of a group of organisms is the first step towards understanding biodiversity and preparing efficient conservation plans. In this context, many efforts have been made to quantify the number of species on Earth and estimate the number of species still unknown to science. A few countries have complete and integrated databases estimating the approximate number of species recorded for their territory, particularly in the Global South. In Brazil, a country of continental dimensions, revealing the richness of the second most diverse clade of invertebrates (=Mollusca) has been a goal of taxonomists. Recently, in an unprecedented, collective, and integrated effort among Brazilian malacologists, it was possible to estimate how many valid species of molluscs are there in Brazil. In this effort, more than 30 mollusc experts joined together to update the Taxonomic Catalogue of the Brazilian Fauna (TCBF), a governmental website that allows a quick and real-time updating of all Metazoan. So far, more than 5,000 updates have been made in TCBF, indicating the presence of 3,552 valid species of molluscs in Brazil, distributed among the main clades as follows: Caudofoveata (10 spp.), Solenogastres (6 spp.), Polyplacophora (35 spp.), Scaphopoda (43 spp.), Cephalopoda (92 spp.), Bivalvia (629 spp.) and Gastropoda (2,737 spp.). The present study, in addition to demonstrating for the first time the richness of Brazilian molluscs, also presents the state of the art of this important phylum of invertebrates highlighting its most representative and neglected groups.

https://doi.org/10.1590/s1984-4689.v40.e23026

Demystifying Quantum Mechanics
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Barioni, Ana Elisa D.

; Mazzi, Felipe B.

; Pimenta, Elsa B.

; Santos, Willian Vieira dos

; Lima, Marco A. P.

Revista Brasileira de Ensino de Física

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2022, Volume 44 elocation e20210433

Resumo: En | Texto: En | PDF: En

Why does such a successful theory like Quantum Mechanics have so many mysteries? The history of this theory is replete with dubious interpretations and controversies, and yet a knowledge of its predictions, however, contributed to the amazing technological revolution of the last hundred years. In its very beginning Einstein pointed out that there was something missing, due to contradictions with the relativity theory. So, even though Quantum Mechanics explains all the nanoscale physical phenomena, there were many attempts to find a way to “complete” it, e.g. hidden-variable theories. In this paper, we discuss some of those enigmas, with special attention to the concepts of physical reality imposed by quantum mechanics, the role of the observer, prediction limits, a definition of collapse, and how to deal with correlated states (the basic strategy for quantum computers and quantum teleportation). That discussion is carried out within the framework of accepting that there is in fact nothing important missing, rather we are just restricted by the limitations imposed by quantum mechanics. The mysteries are thus explained by a proper interpretation of those limitations, which is achieved by introducing two interpretation rules within the Copenhagen paradigm.

https://doi.org/10.1590/1806-9126-rbef-2021-0433

Investigação experimental da lei de Stokes em discos: uma abordagem de baixo custo por vídeo-análise de oscilações amortecidas
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Pereira, L. O.

; Ferreira, D. S. R.

; Freitas, R. P.

; Pimenta, A. R.

; Felix, V. S.

; Gonçalves, E. A. S.

; Dutra, R. S.

Revista Brasileira de Ensino de Física

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2021, Volume 43 elocation e20200498

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

Neste trabalho apresentamos uma atividade de baixo custo que visa a investigação da força de arrasto, que atua na geometria de um disco, através das oscilações amortecidas de um sistema massa-mola. Utilizando discos de papelão de diferentes raios e controlando a massa do sistema oscilatório, mantendo-a fixa, estudamos a influência da variação exclusiva da magnitude da força de arrasto na dinâmica desse sistema, por meio da variação do raio do disco, mantendo todos os outros parâmetros acessíveis do sistema fixos. A técnica de vídeo-análise é utilizada para rastrear o movimento do sistema, levando o estudante a investigar e a extrair conclusões acerca da dependência funcional da força de atrito viscosa com o raio do disco, bem como a obter a constante elástica da mola e uma estimativa para a espessura dos discos.

In this work we present a low-cost activity that aims to investigate the drag force, which acts on the geometry of a disc, through the damped oscillations of a mass-spring system. Using cardboard disks of different radii and controlling the mass of the oscillatory system, keeping it fixed, we studied the influence of the exclusive variation of the magnitude of the drag force on the dynamics of this system, by varying the radius of the disk, keeping all the others fixed system accessible parameters. The video analysis technique is used to track the movement of the system, leading the student to investigate and draw conclusions about the functional dependence of the viscous frictional force with the radius of the disk, as well as to obtain the spring elastic constant and an estimate for the thickness of the disks.

https://doi.org/10.1590/1806-9126-rbef-2020-0498 921 downloads

Proyecto integrador y actitudes: una perspectiva hermenéutica del desarrollo de la competencia en la docencia
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Silva, P. M. S.

; Pires, C. S.

; Pimenta, M. A. A.

Estudios pedagógicos (Valdivia)

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2020, Volume 46 Nº 3 Páginas 181 - 193

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

ABSTRACT: Professional and Technological Education aims at professional qualification whose objective is to prepare and insert the students in the labor market and improve their professional performance. However, the role of school must be broader in order to guarantee the students integral formation. This article highlights the potential of the pedagogical practice of Professional Education in the sense of developing more than the technical contents that underlie within it, the knowledge and skills, the values and attitudes which are decisive factors of the future professional behavior. The investigation was carried out based on bibliographic research and documentary analysis and intends to demonstrate how the proposal of Integrating Projects (IP) can contribute to formation of competence, including the dimensions of knowledge, skills (knowing how to do) and attitudes (knowing how to be), being this last one, the most fragile, and the least commonly worked in comparison to the other dimensions. As the anchor curricular component of professional disciplines, the Integrator Project (IP) promotes interdisciplinary nature, corroborates with development of specific technical contents and provides opportunities to develop values and attitudes, thus fulfilling the role of school which is to guarantee students integral formation.

RESUMEN: En Brasil, la Educación Profesional y Tecnológica apunta a la calificación profesional cuyo objetivo es la formación para el trabajo, la inserción de los trabajadores en el mercado y la mejora de su desempeño profesional. Sin embargo, el papel de la escuela debe ser más amplio para garantizar la formación integral de los estudiantes. Este artículo destaca el potencial de la práctica pedagógica de la Educación Profesional, en el sentido de desarrollar más que el contenido técnico que subyace en los conocimientos y habilidades, los valores y actitudes que determinan el comportamiento del futuro profesional. La investigación realizada a partir de la pesquisa bibliográfica y el análisis documental tiene como objetivo demostrar cómo la propuesta de los Proyectos Integradores (PI) puede contribuir a la formación de competencias, incluyendo las dimensiones del conocimiento (saber), habilidades (saber hacer) y actitudes (saber ser), siendo este último, el más frágil; es decir, el menos trabajado entre las otras dimensiones. Como componente curricular ancla de las disciplinas profesionales, el Proyecto Integrador (PI) promueve la interdisciplinariedad, se corrobora con el desarrollo de contenidos técnicos específicos y brinda oportunidades para el desarrollo de valores y actitudes, cumpliendo así la función de la escuela, que es garantizar la formación integral de los estudiantes.

RESUMO: No Brasil, a Educação Profissional e Tecnológica visa à qualificação profissional cujo objetivo é a formação para o trabalho, inserção do trabalhador ao mercado e a melhoria de desempenho profissional. No entanto, a função da escola deve ser mais ampla no sentido de garantir a formação integral dos estudantes. Este artigo destaca o potencial da prática pedagógica da Educação Profissional, no sentido de desenvolver mais que os conteúdos técnicos que fundamentam os conhecimentos e habilidades, os valores e atitudes determinantes no comportamento do futuro profissional. A investigação realizada a partir de pesquisa bibliográfica e análise documental pretende demonstrar como a proposta dos Projetos Integradores (PI) pode contribuir na formação da competência incluindo as dimensões do conhecimento (saber), habilidades (saber fazer) e atitudes (saber ser), sendo esta última, a mais frágil, ou seja, a menos comumente trabalhada dentre as demais dimensões. Como componente curricular âncora das disciplinas profissionalizantes, o Projeto Integrador (PI) promove a interdisciplinaridade, corrobora com desenvolvimento de conteúdos técnicos específicos, e proporciona oportunidade de desenvolvimento de valores e atitudes, atendendo, desta forma, a função da escola que é garantir a formação integral dos estudantes.

577 downloads

Effects of Light Quality and Chemical Elicitors on the Growth Parameters and Rosmarinic Acid Content of in vitro Cultures of Hyptis pectinata (L.) Poit.
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Pedroso, Rita C. N.

; Pimenta, Leticia P.

; Tozatti, Marcos G.

; Branquinho, Núbia A. A.

; Hara, Alessandra C. B. A. M.

; Silva, Fernando H. L.

; Costa, Alan C.

; Silva, Fabiano G.

; Miranda, Carlos E. S.

; Silva, Marcio L. A.

; Cunha, Wilson R.

; Pauletti, Patricia M.

; Januario, Ana H.

Journal of the Brazilian Chemical Society

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Nov 2019, Volume 30 Nº 11 Páginas 2430 - 2437

Resumo: En | Texto: En | PDF: En

Hyptis pectinata (L.) Poit is a folk medicinal species in Northeast Brazil. In this work, seedlings of H. pectinata were cultured in vitro under diverse light quality spectra and under the influence of two distinct chemical elicitors, salicylic acid and silver nitrate (SN), at concentrations of 30 and 60 μM. Growth parameters, biomass and rosmarinic acid (RA) content were evaluated. RA may be associated with the functional properties of this plant. In the light quality experiments, the highest level of rosmarinic acid was found under red light (161.65 ± 8.64 μg g-1 DW (dry weight)) at 20 days (4.26-fold higher than the control white light). Among the evaluated elicitors, elicitation with 60 μM SN at 3 days and 30 μM SN at 6 days favored the highest rosmarinic acid content (6361.70 ± 216.96 and 4542.98 ± 92.53 μg g-1 DW, respectively), with relatively high biomass yield and a similar number of leaves and height as those of control seedlings. This approach is new for H. pectinata.

https://doi.org/10.21577/0103-5053.20190159 385 downloads

Zika Virus Activity of the Leaf and Branch Extracts of Tontelea micrantha and Its Hexane Extracts Phytochemical Study
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Ferreira, Fernanda L.

; Hauck, Marcela S.

; Duarte, Lucienir P.

; Magalhães, José C. de

; Silva, Louise S. M. da

; Pimenta, Lúcia P. S.

; Lopes, Julio C. D.

; Mercadante-Simões, Maria O.

; Vieira Filho, Sidney A.

Journal of the Brazilian Chemical Society

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Abr 2019, Volume 30 Nº 4 Páginas 793 - 803

Resumo: En | Texto: En | PDF: En

The new triterpene friedelan-1,3,21-trione, the known compounds friedelan-3-one, 3β-friedelinol, 3,4-seco-friedelan-3-oic acid, 28-hydroxyfriedelan-3-one, friedelan-3-oxo-28-al, friedelan-3,21-dione, 30-hydroxyfriedelan-3-one, a mixture of 30-hydroxyfriedelan-3-one/21α-hydroxyfriedelan-3-one, 21β-hydroxyfriedelan-3-one, gutta-percha, squalene, and a mixture of palmitic/stearic/oleic acids were isolated from the hexane extracts of leaves and branches of T. micrantha. Their chemical structures were established by Fourier transform infrared spectroscopy (FTIR), gas chromatography (GC), 1D/2D nuclear magnetic resonance (NMR) and comparison with the literature data. All compounds were described for T. micrantha and the genus Tontelea for the first time. The branch and leaf extracts displayed anti-Zika virus activity at the lowest tested concentration of 15.6 µg mL-1, mainly virucidal effect, and presented no cytotoxicity to Vero cells. Furthermore, the ethyl acetate and methanolic leaf extracts demonstrated the best activities at the concentration of 31.2 and 15.6 µg mL-1 at the viral adsorption and penetration stages, respectively. These results showed that these extracts may be promising candidates for the Zika virus treatment.

https://doi.org/10.21577/0103-5053.20180210 729 downloads

La efectividad de una ley de protección al servicio de la conservación de un recurso marino: El ejemplo del camarón fantasma Callichirus major (Decapoda, Callianassidae) de la costa de Brasil
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Hernáez, Patricio

; Hereman, Michael J.

; Pimenta, Camila E. R.

; Rio, Juliana P. P.

; João, Marcio C. A.

; Pinheiro, Marcelo A. A.

Iheringia. Série Zoologia

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2019, Volume 109 elocation e2019001

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

ABSTRACT Studies on mortality due to fishing based on isolating the effect caused by catches are scarce. The present study analyzed this aspect using the ghost shrimp Callichirus major (Say, 1818) as a biological model, which is heavily harvested along the Brazilian coast. For that purpose, density of burrows and population structure of C. major was examined at two adjacent beaches, Gonzaga and Itararé, from the State of São Paulo, Brazil. Gonzaga beach was considered as control because since 1992 a municipal law prevents the capture of C. major, whereas Itararé as treatment since in this place the species is harvested throughout the year. Burrow density and female CL size were significantly higher in Gonzaga than that Itararé. Sex-ratio did not differ significantly from 1:1 in Itararé, differing from the observed in the area without fishing mortality and also to the general pattern reported in other species of ghost shrimps in which females outnumbered than males. Reproductive potential was significantly smaller in Itararé than Gonzaga, as result of the reduced number of females present in this area relative to Gonzaga. A preliminary estimation indicates that 71 % of shrimps in Itararé died as result of fishing. This information suggests non-viability of C. major in this area given the current pressure of fishing. Presence of C. major in the beach of Itararé and probably in other nearby areas where exploitation occurs would be favored by the permanent supply of larvae from Gonzaga beach where the species is protected by and municipal surveillance.

RESUMEN La mortalidad por pesca ha sido pocas veces estudiada aislando el efecto causado por las capturas. En este estudio se analizó este aspecto usando como modelo biológico al camarón fantasma Callichirus major (Say, 1818), el cual es colectado intensamente en varias regiones de la costa de Brasil. Para ello, la densidad de las galerías y la demografía poblacional de C. major fue analizada en las playas de Gonzaga e Itararé, dos playas contiguas del Estado de São Paulo, Brasil. La playa de Gonzaga fue considerada como control debido a que desde 1992 una ley municipal impide las capturas de C. major, mientras que Itararé fue considerada como tratamiento ya que en este lugar este camarón es recolectado durante todo el año. Los resultados mostraron que la densidad de las galerías y el tamaño de las hembras fueron significativamente mayores en la playa de Gonzaga que en Itararé. En Itararé, la proporción sexual no mostró diferencias significativas de la relación 1:1, lo cual no se ajustó a lo observado en el área sin mortalidad por pesca y al patrón general reportado en otras especies de camarones fantasma del mundo en donde las hembras predominan sobre los machos. El potencial reproductivo fue significativamente menor en Itararé, como efecto del menor número de hembras presentes en esta área sometida a la pesca intensiva de camarones. De acuerdo con una estimativa inicial, un 71% de los individuos murieron por efecto de la pesca en Itararé. Esto hace inviable el sostenimiento ambiental de C. major en esta área dada la actual presión de extracción. La presencia de C. major en la playa de Itararé y probablemente en otras áreas próximas donde es capturada, estaría favorecida por el permanente suministro de larvas procedentes de la playa de Gonzaga, en Santos, que está protegida por ley y fiscalización municipal.

https://doi.org/10.1590/1678-4766e2019001 2087 downloads

Morpho-anatomical, physiological and biochemical changes in rubber tree seeds
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SOUZA, GENAINA A. DE

; DIAS, DENISE C.F.S.

; PIMENTA, THALINE M.

; CARDOSO, AMANDA Á.

; PIRES, RAQUEL M.O.

; ALVARENGA, ANTÔNIO P.

; PÍCOLI, EDGARD A.T.

Anais da Academia Brasileira de Ciências

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Abr 2018, Volume 90 Nº 2 Páginas 1625 - 1641

Resumo: En | Texto: En | PDF: En

ABSTRACT The physical, physiological and biochemical changes during the development until the dispersal of rubber tree seeds were evaluated with the purpose of estimating the point at physiological maturity. A total of 30 plants were selected at different points in a commercial planting area and had their flowers marked during the anthesis and every 15 days after marking. Fruits and seeds were collected for analysis of moisture content, dry matter, diameter and length. Details of the anatomy ultra-structure of the seeds were evaluated. The seed emergence, emergency speed index, heat resistant proteins and oxidative stress enzymes were examined. It was observed that fruits reached maximum size at 120 days after anthesis and seeds at 150 days. The seeds acquired germination capacity after 150 days. At 175 days, they presented the highest percentage of dry matter and lowest moisture, in addition to a higher percentage of germination and vigor. Therefore, it was possible to conclude that the physiological maturity of the rubber tree seeds occurs at 175 days after anthesis, and coincides with its maximum physiological quality. At 175 and 180 days post-anthesis, there is a greater expression of heat resistant proteins as well as low molecular weight and greater oxidative stress enzyme activity.

https://doi.org/10.1590/0001-3765201820170340 2906 downloads

Effect of Endophytic Fungal Associations on the Chemical Profile of in vitroVochysia divergens Seedlings
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Parpinelli, Bruna A. S.

; Siqueira, Katia A.

; Kellner Filho, Luis C.

; Pimenta, Letícia P.

; Costa, Ricardo M. da

; Parreira, Renato L. T.

; Veneziani, Rodrigo C. S.

; Silva, Marcio L. Andrade e

; Cunha, Wilson R.

; Pauletti, Patrícia M.

; Soares, Marcos A.

; Januario, Ana H.

Journal of the Brazilian Chemical Society

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Dez 2017, Volume 28 Nº 12 Páginas 2375 - 2381

Resumo: En | Texto: En | PDF: En

Vochysia divergens (Vochysiaceae) is considered an invasive species in the wetlands of the Brazilian Pantanal, which hinders the cultivation of agricultural species. In this study, we evaluated the chemical profile by HPLC-DAD (high-performance liquid chromatography-diode array detector) of leaves extracts from V. divergens seedlings inoculated with endophytic fungi isolated from V. divergens roots. These fungi were collected on dry (D) and wet (W) seasons in the Pantanal. The presence of tannin hexahydroxydiphenoyl (HHDP)-galloyl-glucose and flavone 3',5'-dimethoxy-luteolin were predominant in the seedlings inoculated with endophytic fungi W experiments at 100 and 80%, respectively. Likewise, flavone 3',5-dimethoxy-luteolin-7-O-β-glucoside showed a similar representation in the two evaluated periods, compared with 5-methoxy-luteolin, which was detected only in seedlings inoculated with W endophytic fungi. This approach is new to V. divergens, which has no scientific data on its in vitro elicitation, in the search for a better understanding of the ecological relationships of this species.

https://doi.org/10.21577/0103-5053.20170091 597 downloads

10.

DLLME-GC/ECD Method for the Residual Analysis of Parathion-Methyl and its Application in the Study of the UV-Photodegradation Process
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Pimenta, Gustavo G.

; Queiroz, Maria E. L. R. de

; Victor, Raquel P. D.

; Noronha, Luiz M.

; Neves, Antônio A.

; Oliveira, André F. de

; Heleno, Fernanda F.

Journal of the Brazilian Chemical Society

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Nov 2017, Volume 28 Nº 11 Páginas 2045 - 2053

Resumo: En | Texto: En | PDF: En

A new method has been developed to determine trace levels of organophosphorus pesticide parathion-methyl in water samples by using dispersive liquid-liquid microextraction (DLLME), followed by gas chromatograph coupled with electron capture detector (GC/ECD) analysis. The optimized and validated method showed high extraction recovery (101.1%), high enrichment factor (57.3), low limits of detection and quantification, 0.083 and 0.250 µg L-1, respectively. The established DLLME-GC/ECD method has been successfully applied for the evaluation of the photodegradation of the parathion-methyl by UV254nm radiation in different conditions of pH and temperature. The parathion-methyl photodegradation at pH 3 and 35 °C achieved > 99.5% after 120 min of exposition. For this condition, it was observed the kinetic rate of 0.0515 min-1, the quantum yield of 1.22 × 10-5 mol Einstein-1 and a half-life time of 13.46 min. All experimental conditions tested proved to be strongly influenced by pH and temperature. The application of the optimized process in distilled and drinking water spiked with parathion-methyl provided residues of this pesticide at levels below the maximum permitted by Brazilian legislation, which is 9.0 µg L-1.

https://doi.org/10.21577/0103-5053.20170048 683 downloads

11.

Impact of light quality on flavonoid production and growth of Hyptis marrubioides seedlings cultivated in vitro
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Pedroso, Rita Cassia N.

; Branquinho, Núbia Angelica A.

; Hara, Alessandra C.B.A.M.

; Costa, Alan Carlos

; Silva, Fabiano Guimarães

; Pimenta, Leticia P.

; Silva, Marcio Luiz A.

; Cunha, Wilson Roberto

; Pauletti, Patricia M.

; Januario, Ana Helena

Revista Brasileira de Farmacognosia

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Ago 2017, Volume 27 Nº 4 Páginas 466 - 470

Resumo: En | Texto: En | PDF: En

ABSTRACT Hyptis marrubioides Epling, Lamiaceae, a species from Brazilian Cerrado, has been used against gastrointestinal infections, skin infections, pain, and cramps. Herein, H. marrubioides seedlings were cultured in vitro under different wavelengths (white, blue, green, red, and yellow) with 50 µmol m-2 s-1 irradiance and a 16-h photoperiod. After 20 and 30 days of cultivation, shoot length, leaf number, fresh mass, and dry mass were evaluated. The flavonoid rutin content was determined by the HPLC-DAD method. The shoots were longer in plants cultivated under yellow (16.603 ± 0.790 cm, 1.8-fold), red (15.465 ± 0.461 cm, 1.7-fold), and green (14.677 ± 0.737 cm, 1.6-fold) lights than in control plants exposed to white light (9.203 ± 0.388 cm). The number of leaves increased in plants exposed to red (23.425 ± 1.138, 1.1-fold) and green (22.725 ± 1.814, 1.1-fold) lights, compared to control plants (20.133 ± 0.827). Fresh (0.665 ± 0.048 g, 1.2-fold) and dry (0.066 ± 0.005 g, 1.3-fold) mass of seedlings were the highest in seedlings grown under red light, compared to seedlings grown under white light (0.553 ± 0.048 and 0.028 ± 0.004, respectively). However, rutin production was higher under white (0.308 mg g-1 of dry weight) and blue lights (0.298 mg g-1 of dry weight). Thus, red light induces plant growth and increases leaf number and dry weight in in vitro-cultivated H. marrubioides, whereas blue and white lights promote the greatest rutin accumulation.

https://doi.org/10.1016/j.bjp.2016.12.004 883 downloads

12.

Irrigation canals in Melo creek basin (Rio Espera and Capela Nova municipalities, Minas Gerais, Brazil): habitats to Biomphalaria (Gastropoda: Planorbidae) and potential spread of schistosomiasis
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Leite, M. G. P.

; Pimenta, E. C.

; Fujaco, M. A. G.

; Eskinazi-Sant'Anna, E. M.

Brazilian Journal of Biology

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Set 2016, Volume 76 Nº 3 Páginas 638 - 644

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

Resumo Neste estudo avaliou-se a presença de espécies de Biomphalaria na bacia do Ribeirão do Melo, municípios de Rio Espera e Capela Nova, sudeste do estado de Minas Gerais, e sua relação com os canais de irrigação presentes na região. Em 17 desses canais foi realizada uma caracterização limnológica, morfológica e hidrológica durante um ciclo sazonal anual. Espécimes de Biomphalaria foram coletados e encaminhados ao Centro de Pesquisas René Rachou/FIOCRUZ (Belo Horizonte, MG) para identificação e exame parasitológico. Dos 17 canais estudados, foram identificados seis como criadouros do caramujo, sendo que em um dos canais coexistiam as espécies B. tenagophila (primeiro registro para a bacia) e B. glabrata. Os resultados indicaram que a baixa vazão e a velocidade do fluxo foram os fatores que contribuíram para a ocorrência pontual dos caramujos na bacia. Estas características hidrológicas foram modificadas por ação antropogênica, através da canalização de trechos lóticos do ribeirão do Melo. Os resultados destacam a necessidade do manejo adequado e monitoramento constante da bacia hidrográfica, sujeita a condições sanitárias inadequadas, como forma de prevenção da ocorrência e propagação da esquistossomose.

Abstract This study analyzed the presence of Biomphalaria in Melo creek basin, Minas Gerais state, and its relationship to irrigation canals. Seventeen of these canals were used to determine a limnological, morphological and hydrological characterization during an annual seasonal cycle. Biomphalaria samples were sent to René Rachou Research Center/FIOCRUZ for identification and parasitological examination. Six canals were identified as breeding areas for mollusks and in one of them it was registered the coexistence of B. tenagophila (first report to this basin) and B. glabrata species. Results indicated that the low flow rate and speed of water flow were the main characteristics that contributed to this specific growth of the mollusks in the area. These hydraulic characteristics were created due to anthropogenic action through the canalization of lotic areas in Melo creek, which allowed ideal ecological conditions to Biomphalaria outbreak. The results emphasize the need of adequate handling and constant monitoring of the hydrographic basin, subject to inadequate phytosanitary conditions, aiming to prevent the occurrence and propagation of schistosomiasis.

https://doi.org/10.1590/1519-6984.22714 1409 downloads

13.

Exposure to an extremely low-frequency electromagnetic field only slightly modifies the proteome of Chromobacterium violaceum ATCC 12472
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Baraúna, Rafael A.

; Santos, Agenor V.

; Graças, Diego A.

; Santos, Daniel M.

; Ghilardi Júnior, Rubens

; Pimenta, Adriano M. C.

; Carepo, Marta S. P.

; Schneider, Maria P.C.

; Silva, Artur

Genetics and Molecular Biology

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Jun 2015, Volume 38 Nº 2 Páginas 227 - 230

Resumo: En | Texto: En | PDF: En

Several studies of the physiological responses of different organisms exposed to extremely low-frequency electromagnetic fields (ELF-EMF) have been described. In this work, we report the minimal effects of in situ exposure to ELF-EMF on the global protein expression of Chromobacterium violaceum using a gel-based proteomic approach. The protein expression profile was only slightly altered, with five differentially expressed proteins detected in the exposed cultures; two of these proteins (DNA-binding stress protein, Dps, and alcohol dehydrogenase) were identified by MS/MS. The enhanced expression of Dps possibly helped to prevent physical damage to DNA. Although small, the changes in protein expression observed here were probably beneficial in helping the bacteria to adapt to the stress generated by the electromagnetic field.

https://doi.org/10.1590/S1415-4757382220140240 1808 downloads

14.

In vitro cytotoxic, antifungal, trypanocidal and leishmanicidal activities of acetogenins isolated from Annona cornifolia A. St. -Hil. (Annonaceae)
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LIMA, LUCIANA A.R.S.

; ALVES, TÂNIA M.A.

; ZANI, CARLOS L.

; SALES JÚNIOR, POLICARPO A.

; ROMANHA, ALVARO J.

; JOHANN, SUSANA

; CISALPINO, PATRÍCIA S.

; PIMENTA, LÚCIA P.S.

; BOAVENTURA, MARIA AMÉLIA D.

Anais da Academia Brasileira de Ciências

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Jun 2014, Volume 86 Nº 2 Páginas 829 - 839

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

Annona cornifolia A. St. -Hil. é uma pequena árvore anual perene encontrada no cerrado brasileiro; seu fruto verde é usado popularmente no tratamento de úlceras. As acetogeninas isoladas a partir das sementes de Annona cornifolia anteriormente apresentaram atividade antioxidante. Continuando as nossas investigações sobre as atividades biológicas das acetogeninas, quatro misturas binárias e dez acetogeninas bis-tetra-hidrofurânicas adjacentes puras foram avaliadas quanto às atividades: citotóxica (sobre três linhagens de células tumorais humanas), antifúngica (sobre Paracoccidioides brasiliensis), tripanocida (sobre Trypanosoma cruzi) e leishmanicida (sobre Leishmania amazonensis). As acetogeninas apresentaram atividade citotóxica, confirmando seu uso potencial na terapia anticâncer. Quanto às atividades leishmanicida e tripanocida, foi observada uma inibição de 87% das formas amastigotas de L. amazonensis e 100% de formas amastigotas e tripomastigotas de T. cruzi, quando testadas a uma concentração de 20 µg mL–1. Além disso, seis acetogeninas mostraram maior atividade sobre todas as três cepas testadas de P. brasiliensis que o trimetoprim-sulfametoxazol, um medicamento usado no tratamento da paracoccidioidomicose. Assim, as acetogeninas podem ser uma alternativa no tratamento de uma série de doenças que têm um enorme impacto em milhões de pessoas no mundo. Este trabalho relata pela primeira as atividades antifúngica, leishmanicida e tripanocida para estas acetogeninas.

Annona cornifolia A. St. -Hil. is a small annual perennial tree found in the Brazilian savannah; their green fruit is popularly used in the treatment of ulcers. The acetogenins isolated from the seeds of Annona cornifolia previously showed to possess antioxidant activity. In continuation of our investigations on the biological activities of acetogenins, four binary mixtures and ten pure adjacent bis-tetrahydrofuran annonaceous acetogenins were evaluated: the cytotoxic (against three human tumor cell lines), antifungal (against Paracoccidioides brasiliensis), trypanocidal (against Trypanosoma cruzi) and leishmanicidal (against Leishmania amazonensis) activities. Acetogenins presented cytotoxic activity confirming their potential use in anti-cancer therapy. Regarding leishmanicidal and trypanocidal activities, an inhibition of 87% of L. amazonensis amastigotes and 100% of T. cruzi amastigotes and trypomastigotes was observed, when tested at the concentration of 20 µg mL–1. Moreover, six acetogenins showed more activity against all the three tested isolates of P. brasiliensis than trimethoprim-sulfamethoxazole, a drug used for treating paracoccidioidomycosis. Thus, acetogenins may be an alternative in treating a number of diseases that have a huge impact on millions of people worldwide. This paper reports for the first time the antifungal, leishmanicidal and trypanocidal activities for these acetogenins.

https://doi.org/10.1590/0001-3765201420130048 2737 downloads

15.

Determination of metal associated with proteins of wheat seed samples after sequential extraction procedure
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Bittencourt, Leila M.

; Lana, Diogo A. P. D.

; Pimenta, Adriano M. de C.

; Santos, Agenor V. dos

; Gonçalves, Ana Paula F.

; Augusti, Rodinei

; Costa, Letícia M.

Journal of the Brazilian Chemical Society

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Fev 2014, Volume 25 Nº 2 Páginas 264 - 270

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

Este trabalho foi conduzido para estudar a distribuição de Cu, Fe, Mn e Zn nas frações proteicas de amostras de trigo submetidas a um procedimento de extração sequencial. Maiores concentrações dos elementos foram determinadas na fração extraída com tampão Tris-HCl contendo 1% de dodecil sulfato de sódio (SDS). As frações da amostra de trigo obtidas após o procedimento de extração foram analisadas por eletroforese em gel de poliacrilamida unidimensional (1D SDS-PAGE) e as bandas de proteínas foram tratadas para quantificar os metais por espectrometria de absorção atômica em forno de grafite (GF AAS). Desta forma, foi possível associar os metais Cu, Fe, Mn e Zn às bandas proteicas de peso molecular específico. As frações proteicas da amostra de trigo foram analisadas por espectrometria de massas por tempo de vôo acoplada à ionização dessortiva de matriz por laser (MALDI-TOF-MS), após procedimento de digestão proteica, identificando-se as proteínas lipid transfer e grain softness, sendo esta última possivelmente associada ao metal manganês.

This work was initially conducted to study the distribution of Cu, Fe, Mn and Zn in the protein fractions of wheat sample subjected to sequential extraction procedure. The highest metal concentrations were determined in the fraction extracted with Tris-HCl buffer containing 1% sodium dodecyl sulfate (SDS). The fractions of wheat sample obtained after the extraction procedure were analyzed by one-dimensional polyacrylamide gel electrophoresis (1D SDS-PAGE) and protein bands were treated to quantify Cu, Fe, Mn, and Zn by graphite furnace atomic absorption spectrometry (GF AAS). Metals were associated to protein bands of specific molecular weight, determined using a standard protein. The protein fractions were also analyzed by matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF-MS) after a typical protein digestion protocol, identifying lipid transfer protein and grain softness, the latter being possibly associated to Mn.

https://doi.org/10.5935/0103-5053.20130292 2212 downloads

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