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Unvaccinated periodontal patients with a history of COVID-19: clinical findings in a Dental School setting
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Roza, Vanessa B.

; Brasil, Sabrina C.

; Mello, Luiza F.

; Silva-Boghossian, Carina M.

Brazilian Dental Journal

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oct 2023, Volume 34 N. 5 Pages 134 - 139

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

Abstract This study analyzed the periodontal clinical data of individuals with a history of COVID-19 treated in a dental school during the pandemic in 2021 before vaccination. Methods: This analysis included individuals older than 18 years with no history of systemic disorders other than systemic arterial hypertension. Individuals who had COVID-19 were classified according to the World Health Organization as asymptomatic, with mild, moderate, severe, or critical symptoms. Results: A total of 95 individuals were evaluated, which included 24 with a history of COVID-19. Seventeen percent had been asymptomatic, 21% had mild, 25% moderate, 21% severe, and 17% critical symptoms, including intubation. Individuals with no history of COVID-19 presented significantly lower measurements of probing depth (p=0.003; Mann-Whitney test) and clinical attachment level (p=0.002) compared to individuals with a history of COVID-19. A significant negative association was found between bleeding on probing and the severity of characteristics of COVID-19 (rho= -0.233; p=0.023). Conversely, positive associations between the values of probing depth (rho= 0.292; p=0.004) and mean clinical attachment level (rho= 0.300; p=0.003) and the characteristics of COVID-19 were found. Conclusions: The periodontal data shows that patients who had COVID-19 before vaccination may present a worse periodontal status when compared to patients in the same clinical setting with no history of COVID-19. However, a more extensive study should confirm it with more participants.

Resumo Este estudo analisou os dados clínicos periodontais de indivíduos com histórico de COVID-19 tratados em uma escola de odontologia durante a pandemia em 2021, antes da vacinação. Métodos: Essa análise incluiu indivíduos maiores de 18 anos sem histórico de distúrbios sistêmicos, exceto hipertensão arterial sistêmica. Os indivíduos que tiveram COVID-19 foram classificados de acordo com a Organização Mundial da Saúde como assintomáticos, com sintomas leves, moderados, graves ou críticos. Resultados: 95 indivíduos foram avaliados, incluindo 24 com histórico de COVID-19. 17% eram assintomáticos, 21% tinham sintomas leves, 25% moderados, 21% graves e 17% críticos, incluindo intubação. Os indivíduos sem histórico de COVID-19 apresentaram medidas significativamente mais baixas de profundidade de sondagem (p=0,003; teste de Mann-Whitney) e nível de fixação clínica (p=0,002) em comparação com indivíduos com histórico de COVID-19. Foi encontrada uma associação negativa significativa entre o sangramento à sondagem e a gravidade das características da COVID-19 (rho= -0,233; p=0,023). Por outro lado, foram encontradas associações positivas entre os valores de profundidade de sondagem (rho = 0,292; p = 0,004) e o nível médio de apego clínico (rho = 0,300; p = 0,003) e as características da COVID-19. Conclusão: Os dados periodontais mostraram que os pacientes que tiveram COVID-19 antes da vacinação podem apresentar um pior estado periodontal quando comparados a pacientes no mesmo ambiente clínico sem histórico de COVID-19. No entanto, um estudo mais extenso deve ser realizado para confirmar tal achado com maior número de participantes.

https://doi.org/10.1590/0103-6440202305284

Genetic algorithm in the design of soybean silos for airflow homogenization
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Petravicius, Daniel

; Binelo, Manuel O.

; Binelo, Marcia de F. B.

; Faoro, Vanessa

; Silva, José A. G. da

Revista Brasileira de Engenharia Agrícola e Ambiental

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jul 2023, Volume 27 N. 7 Pages 531 - 538

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

RESUMO Um dos processos mais usados para garantir a qualidade dos grãos em grandes armazéns é a aeração. Um modelo de otimização que considere a natureza limitada e discreta das entradas de ar, além das características geométricas do armazém dos grãos, pode produzir resultados mais facilmente aplicáveis no design de novos armazéns graneleiros. O objetivo deste estudo foi parametrizar e aplicar o modelo de Darcy-Forchheimer para simulação de fluxo de ar em massa de grãos de soja em função da altura da camada de grãos e desenvolver um método de inteligência artificial baseado em algoritmos genéticos para otimizar as dimensões do armazém de grãos e a configuração das entradas de ar para obter um fluxo de ar mais homogêneo na massa de grãos. A parametrização considerou o efeito da compactação dos grãos e as simulações em OpenFOAM mostraram boa concordância com os dados experimentais. O algoritmo genético proposto foi capaz de aumentar a homogeneidade do fluxo de ar se comparada ao armazém usado como referência. aeração graneleiros DarcyForchheimer Darcy Forchheimer experimentais referência

ABSTRACT One of the main processes used to maintain grain quality in large storage bins is aeration. An optimization model that considers the limited and discrete nature of the air inlets, in addition to the geometric characteristics of the storage bin, could produce results more easily applicable results for the design of new grain storage bins. The objective of this study was to parameterize and to apply the Darcy-Forchheimer model for simulating airflow in soybean grain mass as function of grain layer height, and develop an artificial intelligence method based on genetic algorithm for optimizing grain storage bin dimensions and air inlet configurations to obtain a more homogeneous airflow in the grain mass. The parameterization considered the effect of grain compaction and the OpenFOAM simulations showed good agreement with the experimental data. The proposed genetic algorithm was able to increase the airflow homogenization when compared to the grain storage bin used as reference. aeration inlets DarcyForchheimer Darcy Forchheimer height data reference

https://doi.org/10.1590/1807-1929/agriambi.v27n7p531-538

How many species of Mollusca are there in Brazil? A collective taxonomic effort to reveal this still unknown diversity
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Machado, Fabrizio M.

; Miranda, Marcel S.

; Salvador, Rodrigo B.

; Pimenta, Alexandre D.

; Côrtes, Mariana O.

; Gomes, Jaime A.J.

; Miyahira, Igor C.

; Agudo-Padrón, Ignacio

; Oliveira, Cléo D.C.

; Caetano, Carlos H.S.

; Coelho, Paulo R.S.

; D’Ávila, Sthefane

; Arruda, Eliane P. de

; Almeida, Sérgio M. de

; Gomes, Suzete R.

; Alvim, Juliana

; Galvão-Filho, Hilton

; L. Ferreira-Júnior, Augusto

; Marques, Rodrigo C.

; Martins, Inês

; Souza, Leonardo S. de

; Arruda, Janine O.

; Cavallari, Daniel C.

; Santos, Sonia B. dos

; Pedro, Natan C.

; Salles, Anna C. de A.

; Dornellas, Ana P.S.

; Lima, Tarcilla C. de

; Amaral, Vanessa S. do

; Silva, Fernanda S.

; Passos, Flávio D.

; Thiengo, Silvana S.

; Leite, Tatiana S.

; Simone, Luiz R.L.

Zoologia (Curitiba)

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2023, Volume 40 elocation e23026

Abstract: En | Text: En | PDF: En

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

Antifungal activity of lemongrass and thyme essential oils and effect on gray mold control and postharvest quality of ‘Italia’ grape
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Lopes, Vanessa Caroline

; Benato, Eliane Aparecida

; Silva, Bárbara Marçon Pereira da

; Veiga, Júlia Claudiane da

; Bron, Ilana Urbano

; Cia, Patrícia

Bragantia

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2023, Volume 82 elocation e20220202

Abstract: En | Text: En | PDF: En

ABSTRACT The aim of this study was to test the hypothesis that lemongrass and thyme essential oils (EOs) reduce Botrytis cinerea development and control gray mold in ‘Italia’ grapes. The fungitoxicity evaluation was performed by EOs direct contact with the pathogen, in culture medium, and by exposure to the EOs volatile phase. Individualized rachis berries were inoculated by subcuticular injection of a conidia suspension and after 4 hours sprayed with the EOs of lemongrass and thyme (100 to 1,000 mg·L-1), or oils blend (500 mg·L-1 thyme + 100 mg·L-1 lemongrass), and then stored at 25 °C / 75% relative humidity. To verify the possibility that the EOs protect the fruit against B. cinerea, the berries were sprayed with 400 mg·L-1 of each EOs or with the blend (200 mg·L-1 thyme + 200 mg·L-1 lemongrass), and after 24 hours inoculated with B. cinerea. On clusters, thyme (800 mg·L-1) and the blend (500 mg·L-1 thyme + 100 mg·L-1 lemongrass) were sprayed 4 hours after inoculation and then stored at 25 and 1 °C. The disease incidence and severity were analyzed, as well as the fruit quality attributes. EOs had antimicrobial effect, in-vitro, incorporated into the culture medium or by volatilization against B. cinerea. On detached berries, the thyme and oil blend reduced the gray mold severity when inoculated 4 hours before spraying. In clusters, thyme at 800 mg·L-1 significantly reduced the gray mold development only in fruits kept at 1 °C, without impairing the clusters quality, which could be an alternative for the disease management in postharvest.

https://doi.org/10.1590/1678-4499.20220202

Two years of the COVID-19 pandemic: an anesthesiology perspective
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Schmidt, André P.

; Módolo, Norma S.P.

; de Amorim, Célio G.

; Simões, Cláudia M.

; Kraychete, Durval C.

; Joaquim, Eduardo H.G.

; Lineburger, Eric B.

; Papa, Fábio V.

; Fernandes, Fátima C.

; Mendes, Florentino F.

; Guimarães, Gabriel M.N.

; Barros, Guilherme A.M.

; Silva-Jr, João M.

; Lima, Laís H. Navarro e

; Azi, Liana M.T.A.

; Carvalho, Lorena I.M.

; Stefani, Luciana C.

; Garcia, Luis V.

; Carmona, Maria José C.

; Salgado Filho, Marcello F.

; Nascimento Junior, Paulo do

; Alves, Rodrigo L.

; Carvalho, Vanessa H.

; Quintão, Vinicius C.

; Carmona, Maria José C.

Brazilian Journal of Anesthesiology

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apr 2022, Volume 72 N. 2 Pages 165 - 168

Abstract: En | Text: En | PDF: En

https://doi.org/10.1016/j.bjane.2022.02.004

Seleno- and Telluro-Functionalization of Quinones: Molecules with Relevant Biological Application
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Cordeiro, Pâmella S.

; Chipoline, Ingrid C.

; Ribeiro, Ruan C. B.

; Pinho, David R.

; Ferreira, Vitor F.

; Silva, Fernando C. da

; Forezi, Luana S. M.

; Nascimento, Vanessa

Journal of the Brazilian Chemical Society

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feb 2022, Volume 33 N. 2 Pages 111 - 127

Abstract: En | Text: En | PDF: En

Quinones and organochalcogens are classes of compounds with great biological applicability, such as antioxidant, anticancer, anti-Alzheimer, and antidepressant activities, among others. Thus, the combination of these two classes of compounds is important to obtain new hits with biological activities that are additive or synergistic. Several methodologies for the preparation of this class of hybrid compound have been widely described. Many of the prepared hybrid molecules have shown increased biological activities and, in some cases, to act as two distinct pharmacophores. In this review, methods for the preparation of selenium-quinones, tellurium-quinones and their biological applications are highlighted.

https://doi.org/10.21577/0103-5053.20210148

Brief International Cognitive Assessment for Multiple Sclerosis (BICAMS): discrete and regression-based norms for the Brazilian context
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Spedo, Carina Tellaroli

; Pereira, Danilo de Assis

; Frndak, Seth Edward

; Marques, Vanessa Daccach

; Barreira, Amilton Antunes

; Smerbeck, Alan

; Silva, Pedro Henrique Rodrigues da

; Benedict, Ralph H. B.

Arquivos de Neuro-Psiquiatria

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jan 2022, Volume 80 N. 1 Pages 62 - 68

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

ABSTRACT Background: The Brief International Cognitive Assessment for Multiple Sclerosis (BICAMS) has been recently developed as a brief, practical, and feasible tool for cognitive impairment in multiple sclerosis (MS). Objective: This study aimed to provide continuous and discrete normative values for the BICAMS in the Brazilian context. Methods: Normatization was achieved using six hundred and one healthy controls from the community assessed at five Brazilian geopolitical regions. Results: Mean raw scores, T scores, percentiles, and Z scores for each BICAMS measure are provided, stratified by age and educational level. Regression-based norms were provided by converting raw scores to scaled scores, which were regressed on age, gender, and education, yielding equations that can be used to calculate the predicted scores. Regression analyses revealed that age, gender, and education significantly influenced test results, as in previous studies. Conclusions: The normative data of the BICAMS to the Brazilian context presented good representativeness, improving its use in daily clinical practice.

RESUMO Antecedentes: O BICAMS foi desenvolvido como uma ferramenta breve, prática e confiável para avaliar o comprometimento cognitivo na esclerose múltipla (EM). Objetivo: Neste estudo, objetivamos fornecer dados normativos para o BICAMS. Métodos: Normatização foi realizada com seiscentos e um controles saudáveis da comunidade avaliados das cinco regiões geopolíticas brasileiras. Resultados: Escores brutos médios, escore T, percentil e escore Z para cada medida do BICAMS são fornecidos e estratificados por idade e nível educacional. Normas baseadas em regressão foram obtidas através da conversão dos pontos brutos em pontos ponderados, produzindo parâmetros de regressão que podem ser usados para calcular os escores preditos. As análises de regressão revelaram que idade, gênero e educação influenciaram significativamente nos resultados do teste, assim como em estudos prévios. Conclusão: Normas do BICAMS para o contexto brasileiro apresentaram boa representatividade, contribuindo para a utilização na prática clínica diária.

https://doi.org/10.1590/0004-282x-anp-2020-0526

NURSES' KNOWLEDGE, ATTITUDES AND PRACTICES REGARDING HEPATITIS B: AN INTEGRATIVE REVIEW
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Oliveira, Vanessa Moura Carvalho de

; Gomes, Cecília Natielly da Silva

; Rocha, Daniel de Macêdo

; Abreu, Wilson Jorge Correia Pinto

; Galvão, Marli Teresinha Gimeniz

; Magalhães, Rosilane de Lima Brito

Texto & Contexto - Enfermagem

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2022, Volume 31 elocation e20210187

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

RESUMO Objetivo: analisar, na literatura, o conhecimento, as atitudes e as práticas de enfermeiros sobre hepatite B. Método: revisão integrativa, com busca e seleção realizadas por pares e de forma independente, após consulta eletrônica às bases de dados CINAHL, MEDLINE, SCOPUS, Web of Science, LILACS, BDENF e IBECS em janeiro de 2021. A amostra foi constituída por 15 estudos primários publicados sem restrição temporal ou de idioma. A análise e a síntese dos resultados ocorreram de forma descritiva. Resultados: foram identificadas limitações no conhecimento, atitudes inconsistentes e práticas assistenciais comumente negligenciadas, relacionadas às medidas de prevenção, imunização e biossegurança, ao gerenciamento de risco e monitoramento de sintomas e complicações, que contribuíram para uma maior exposição ocupacional. Dentre os fatores associados, destacaram-se a baixa participação em atividades de educação permanente, o nível de formação, as condições laborais, as limitações na disponibilização de testes de imunização (anti-HBs) e a subnotificação de agravos. Conclusão: o conhecimento, as atitudes e as práticas desenvolvidos por enfermeiros, relacionados à hepatite B, mostraram-se limitados e inconsistentes, podendo resultar na maior exposição ocupacional, assim como impactar diretamente a cobertura vacinal e a ocorrência de incidentes.

ABSTRACT Objective: to analyze, in the literature, the nurses' knowledge, attitudes and practices regarding Hepatitis B. Method: an integrative review, with search and selection conducted independently by peers, after electronic queries in the CINAHL, MEDLINE, SCOPUS, Web of Science, LILACS, BDENF and IBECS databases in January 2021. The sample consisted in 15 primary studies published with no time or language restrictions. Analysis and synthesis of the results were carried out in a descriptive manner. Results: limitations in knowledge, inconsistent attitudes and commonly neglected assistance-related practices were identified, related to prevention, immunization and biosafety measures, to risk management and to monitoring of symptoms and complications, which contributed to greater occupational exposure. Among the associated factors, low participation in permanent education activities, training level, working conditions, limitations in the availability of immunization tests (anti-HBs) and underreporting of health problems stood out. Conclusion: the knowledge, attitudes and practices developed by nurses in relation to Hepatitis B proved to be limited and inconsistent, which may result in greater occupational exposure, as well as exert a direct impact on vaccination coverage and occurrence of incidents.

RESUMEN Objetivo: analizar, en la literatura, los conocimientos, las actitudes y las prácticas de los enfermeros en relación a la Hepatitis B. Método: revisión integradora, en la cual la búsqueda y la selección fueron realizadas por pares y de manera independiente, luego de consultas electrónicas en las siguientes bases de datos: CINAHL, MEDLINE, SCOPUS, Web of Science, LILACS, BDENF e IBECS en enero de 2021. La muestra estuvo compuesta por 15 estudios primarios publicados sin restricciones de tiempo o de idioma. El análisis y la síntesis de los resultados se realizaron en forma descriptiva. Resultados: se identificaron limitaciones en el conocimiento, actitudes inconsistentes y prácticas asistenciales comúnmente desatendidas, relacionadas con las medidas de prevención, inmunización y bioseguridad, y con la administración del riesgo y el monitoreo de síntomas y complicaciones, que contribuyeron a una mayor exposición ocupacional. Entre los factores asociados, se destacaron los siguientes: escasa participación en actividades de educación permanente, el nivel de formación, las condiciones laborales, las limitaciones en la disponibilidad de pruebas de inmunización (anti-HBs) y la subnotificación de problemas de salud. Conclusión: los conocimientos, las actitudes y las prácticas desarrolladas por los enfermeros, en relación con la Hepatitis B, demostraron ser limitados e inconsistentes, con la posibilidad de derivar en una mayor exposición ocupacional, al igual que de afectar directamente la cobertura de las vacunas y la frecuencia de incidentes.

https://doi.org/10.1590/1980-265x-tce-2021-0187

Comparison of senescence phenotype of short- and long- term cultured rat mesenchymal stem cells in vitro
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LEMOS, VANESSA P.A.

; PORTO, MICHELE

; CEZAR, RAFAEL DA S.

; SANTOS, BRUNO P. DOS

; SOUZA, MELISSA R. DE

; SILVA, JULIANA DA

; NARDI, NANCE B.

; CAMASSOLA, MELISSA

Anais da Academia Brasileira de Ciências

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2022, Volume 94 elocation e20211246

Abstract: En | Text: En | PDF: En

Abstract Mesenchymal stem cells present clinical potential to recover and regenerate injured tissues in diverse pathologies. The in vitro expansion and characterization of these cells contribute to elucidation of the mechanisms of senescence and strategies involving cell therapies. This study aimed to compare specific characteristics between initial and advanced passages of mesenchymal stem cells derived from adipose tissue and bone marrow. Both cell types were characterized according to immunophenotype, osteogenic differentiation, genomic instability, migration assay, doubling population time and colony forming ability. Our results demonstrated that both cell types were able to maintain an immunophenotypic profile typical of mesenchymal stem cells during increasing passages. Adipose stem cells at initial passage presented greater migration capacity compared to advanced passage cells, and advanced passage cells proliferated faster than initial passage cells. Bone marrow stem cells at early passages presented higher osteogenic potential than advanced. At advanced passages they presented higher colony forming capacity and genetic damage than those at initial passage. These results suggest that mesenchymal stem cells maintained in culture presented characteristics of senescence that should be monitored prior the use in regenerative medicine and cells derived from bone marrow at initial passage have better potential for therapeutic use in bone tissue engineering.

https://doi.org/10.1590/0001-3765202220211246

10.

Phytopathogen resistance of phytohormone-deficient and low-sensitivity mutant tomatoes
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Tunes, Carla Dias

; Gonçalves, Vanessa Pinto

; Rodrigues, Daniele Brandstetter

; Almeida, Andréia da Silva

; Meneses, Priscila Rossatto

; Neumann, Alexandre Milech

Revista Ceres

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jun 2021, Volume 68 N. 3 Pages 212 - 218

Abstract: En | Text: En | PDF: En

ABSTRACT This study broadens the knowledge of plant-pathogen interactions using phytohormone-deficient and low-sensitivity mutant tomatoes. The experiment was performed under greenhouse conditions and the mutants used were provided by the HCPD laboratory, at ESALQ/USP. The hormone mutant Never ripe showed a larger final lesion size when inoculated with Botrytis cinerea, whereas curl3 was relatively resistant to this pathogen and more susceptible when inoculated with Phytophthora infestans. The transgenic 35S :: nahG was more susceptible to Oidium lycopersici, and the double mutant dgt, Nr more resistant. The low sensitivity to brassinosteroids confers greater susceptibility to P. infestans and higher resistance to B. cinerea. The deficiency of the hormone auxin promotes high resistance to diseases caused by O. lycopersici, P. infestans and B. cinerea.

https://doi.org/10.1590/0034-737x202168030007 101 downloads

11.

Selection of microorganisms and preparation of inoculants with potential applications in the remediation of soil contaminated with hexazinone
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Santos, Vanessa Silva

; Martins, Paula Fabiane

; Borgo, Lucélia

; Faria, Paula Sperotto Alberto

; Silva, Cintia Faria da

; Jakelaitis, Adriano

Ciência Rural

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2021, Volume 51 N. 6 elocation e20200263

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

RESUMO: O uso de agroquímicos resulta em impactos ambientais e torna-se necessário o emprego de tecnologias sustentáveis para diminuição de contaminantes no solo. O hexazinona é o herbicida mais utilizado para a cultura da cana-de-açúcar, e apresenta persistência no ambiente. A principal via de degradação no solo é por meio de microrganismos. Com isso, selecionou-se seis microrganismos que apresentaram crescimento na presença do herbicida: SCR1 - Microbacterium arborescens; SCR2 - Bacillus pumilus; SCM3 - Stenotrophomonas maltophilia; SCM4 - Bacillus cereus; SCM5A - M. arborescens; SCM5B - Bacillus safensis. Foi realizado um teste para avaliar a habilidade de cada linhagem na solubilização de fosfatos, e no caso da solubilização de Ca3(PO4)2, as linhagens que apresentaram melhores resultados foram B. pumilus e S. maltophilia. Posteriormente, os inoculantes foram preparados e a concentração após plaqueamento de 2,71x109 UFC mL-1 para B. pumilus, 1,02x109 UFC mL-1 para S. maltophilia e consórcio com as duas linhagens 1,14x1010 UFC mL-1 apresentaram valores satisfatórios para utilização como inoculantes.

ABSTRACT: The excessive use of agrochemicals negatively impacts the environment, making the development of sustainable technologies for the reduction of contaminants in soil necessary. Hexazinone is the herbicide most used for sugarcane crops and persists in the environment. Moreover, its main route of degradation in the soil is through microorganisms. Therefore, six microorganisms were selected that presented growth in the presence of the herbicide; SCR1 - Microbacterium arborescens; SCR2 - Bacillus pumilus; SCM3 - Stenotrophomonas maltophilia; SCM4 - Bacillus cereus; SCM5A - M. arborescens; and SCM5B - B. safensis. A test was performed to evaluate the ability of each lineage in phosphate solubilization. For the Ca3(PO4)2 solubilization test, the strains that showed the best results were B. pumilus and S. maltophilia. Subsequently, the inoculants were prepared and the concentrations after plating were 2.71 × 109 CFU mL-1 for B. pumilus, 1.02 × 109 CFU mL-1 for S. maltophilia, and 1.14 × 1010 CFU mL-1 for a combination of the two strains. These were satisfactory values for use as inoculants.

https://doi.org/10.1590/0103-8478cr20200263 416 downloads

12.

PHYSIOLOGICAL AND MORPHOANATOMIC RESPONSES OF Bowdichia virgilioides KUNTH. (FABACEAE) TO GLYPHOSATE
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Oliveira, Ana Paula Augusta de

; Crispim-Filho, Ailton José

; Santos, Vanessa Ribeirode Souza

; Costa, Alan Carlos

; Silva, Kellen Lagares Ferreira

Revista Árvore

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2021, Volume 45 elocation e4528

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

RESUMO A expansão do agronegócio no Brasil, se deve em parte pela ampliação das áreas agricultáveis no Cerrado, o que, consequentemente, leva a um aumento do uso de herbicidas, entre eles o glifosato. Em vista disso, objetivou-se avaliar as respostas fisiológicas e morfoanatômicos de Bowdichia virgilioides Kunth. (Fabaceae), quando expostas ao herbicida glifosato, em condições controladas de casa de vegetação. Além disso, o estudo se propôs a identificar possíveis padrões de respostas da espécie estudada, com o propósito de fornecer subsídios para o estudo da espécie, em áreas atingidas por deriva deste herbicida. O delineamento experimental foi em blocos ao acaso, com sete doses do herbicida: 25, 50, 100, 200, 400, 800 e 1200 g i.a ha-1, além d o controle (0), com quatro repetições cada. Foram analisados: trocas gasosas, emissão de fluorescência da clorofila a, conteúdo de pigmentos cloroplastídicos, permeabilidade de membrana e características visuais e anatômicas. Os resultados mostraram que o glifosato é fitotóxico para B. virgilioides, pois, mesmo em doses baixas este herbicida foi capaz de afetar todos os parâmetros analisados. Houve também a confirmação da presença de compostos fenólicos, principalmente no parênquima paliçádico. As alterações metabólicas apresentadas, comprovam a sensibilidade de B. virgilioides ao glifosato. Dessa maneira, as respostas observadas, podem servir como ferramenta de diagnóstico dos efeitos da exposição de glifosato sobre essa espécie, presente em áreas nativas atingidas pela deriva deste herbicida. Seu uso indiscriminado é um risco à biodiversidade do Cerrado.

ABSTRACT The expansion of agribusiness in Brazil is partly due to the expansion of arable areas in the Cerrado biome, which, consequently, leads to an increase in the use of herbicides, including glyphosate. Therefore, the objective of this study was to evaluate the physiological and morphoanatomic responses of Bowdichia virgilioides Kunth. (Fabaceae), when exposed to the herbicide glyphosate, under controlled greenhouse conditions. In addition, the study proposed to identify possible response patterns of the studied species and provide subsidies for the study of the species in areas affected by the drift of the herbicide. The experimental design was in randomized blocks, with seven doses of the herbicide: 25, 50, 100, 200, 400, 800, and 1200 g i.a ha-1 besides the control (0), with four repetitions each. Gas exchange, chlorophyll a fluorescence emission, chloroplast pigment content, membrane permeability, and visual and anatomical features were analyzed. The results showed that glyphosate is phytotoxic to B. virgilioides because, even at low doses, this herbicide was able to affect all parameters analyzed. There was also confirmation of the presence of phenolic compounds, mainly in the palisade parenchyma. The metabolic alterations presented demonstrated the sensitivity of B. virgilioides to glyphosate. Thus, the observed responses can serve as a tool for diagnosing the effects of glyphosate exposure on this species, present in native areas affected by the drift of this herbicide. Its indiscriminate use poses a risk to Cerrado biodiversity.

https://doi.org/10.1590/1806-908820210000028 124 downloads

13.

ANÁLISE ESPECTROSCÓPICA DA MATÉRIA ORGÂNICA NO SEDIMENTO SUPERFICIAL DA BAÍA DE SEPETIBA, RIO DE JANEIRO, BRASIL
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Carvalho, Angelo C. B.

; Silva, Libério J.

; Dick, Déborah P.

; Moreira, Vanessa de A.

; Vicente, Murilo de C.

; Andrade, Antoni Felipe O. de

; Bidone, Edison Dausacker

; Sabadini-Santos, Elisamara

Química Nova

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may 2020, Volume 43 N. 5 Pages 552 - 557

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

Spectroscopic techniques are powerful tools for molecular organic matter assessment in sediments, which analysis request low sample mass and are cheap, fast and easy to obtain. The aim of this work was to evaluate the elemental (C, N) and molecular composition of the organic matter in relation to the grain-size distribution over surface sediments from Sepetiba Bay. Spatial distribution of grain-size was remarkable heterogeneous, with the internal area presenting the highest levels of fine sediments, organic carbon (0.20-3.45%) and total nitrogen (<LQ-0.36%). Concentrations of organic carbon from surface sediments at the study area seem to be lower when compared to other degraded coastal systems. C/N ratio vary between 10 and 20, suggesting a mix of allochthonous and autochthonous sources of organic matter to the sediments. DRIFT spectra presented prominent and marked bands assigned to organic and mineral functional groups bonding and the spectra identified chemical bonds of molecular composition such as aliphatic and aromatic functional groups.

https://doi.org/10.21577/0100-4042.20170518 471 downloads

14.

Mutual Coupling Reduction in Phased Array Antennas Applying High-Impedance Surface at X Band
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Araújo, José Bruno O. de

; Souza, Vanessa P. R. Magri

; Ferreira, Tadeu N.

; Matos, Leni J. de

; Siqueira, Glaucio L.

; Souza, Jorge M.

; Silva, Maurício W. B. da

Journal of Microwaves, Optoelectronics and Electromagnetic Applications

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mar 2020, Volume 19 N. 1 Pages 118 - 128

Abstract: En | Text: En | PDF: En

Abstract This paper presents a microstrip phased array using High Impedance Surface - Electromagnetic Bandgap (HIS-EBG) in order to minimize the effects of mutual coupling among the antenna elements. Each element of the array is fed by a coaxial cable allowing the beam steering by controlling the signal of the input port of each element. This phased array operates at X Band as well as the bandgap of the HIS-EBG structure. Its main applications are satellite communication and broadcasting systems. Results show reductions in the mutual coupling up to 12 dB, and improvements in the return loss and gain.

https://doi.org/10.1590/2179-10742020v19i11773 1687 downloads

15.

INFLUÊNCIA DO IMPEDIMENTO ESTÉRICO DE LIGANTES ANCILARES EM COMPLEXOS A BASE DE Ru APLICADOS EM METÁTESES DO ÁLCOOL E ACETATO CINAMÍLICOS
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Vieira, Vanessa B.

; Silva, Eliada A. da

; Carvalho Jr., Valdemiro P.

; Lima-Neto, Benedito S.

; Sá, José L. S.

Química Nova

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jan 2020, Volume 43 N. 1 Pages 24 - 31

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

Cinnamyl alcohol (AC) and cinnamyl acetate (ACM) were used as substrates in olefin metathesis reactions catalyzed by RuCl2(PCy3)2(=CHPh), first-generation Grubbs catalyst-G1, and RuCl2(PCy3)(H2IMes)(= CHPh), second-generation Grubbs catalyst-G2. The reactions occurred in the same reaction conditions for both substrates, 50 °C, for 24 h, in the proportions Ru:substrate of 1:1 and 1:10 mol. At the end of each experiment, the reaction mixture was evaluated by GC-MS and NMR of 13C{1H}. The results revealed different products when G1 and G2 are applied in the metathesis of AC, 1,5-diphenyl-2-pentene and stilbene, respectively. When ACM is the substrate, no product is noted with G1 and stilbene was the compound obtained with G2 as catalyst. In this study, we have presented a discussion about the electronic and steric influence of the ancillary ligands in the yield and type of product formed in the catalytic process.

https://doi.org/10.21577/0100-4042.20170462 525 downloads

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