24 results on '"Zamith, Helena Pereira da Silva"'
Search Results
2. Monitoring the quality of the water used in mobile dialysis services in intensive care units in the city of Rio de Janeiro
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Jesus, Priscila Rodrigues de, primary, Ferreira, Joana Angélica Barbosa, additional, Carmo, Juliana dos Santos, additional, Albertino, Sheila Regina Gomes, additional, Vicentini Neto, Santos Alves, additional, Santos, Lisia Maria Gobbo dos, additional, and Zamith, Helena Pereira da Silva, additional
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- 2022
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3. Avaliação da influência do sexo e das linhagens de camundongo NIH e BALB/cAn no teste de ganho de peso da vacina DTP
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Domingos, Roseli Maria, Miller, Reginaldo Assad, Corrado, Alexandre Pinto, and Zamith, Helena Pereira da Silva
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Diphtheria ,ertussis Toxin ,NIH Mice ,BALB/cAn Mice ,Vacina Adsorvida Difteria ,Camundongos BALB/cAn ,Camundongos NIH ,Mouse Weight Gain Tes ,Teste de Ganho de Peso em Camundongo ,Tétano e Pertussis ,etanus and Whole Cell Pertussis Vaccine (Adsorbed) ,Toxina Pertussis - Abstract
Introduction: The mouse weight gain test (MWGT) for determination of toxicity of whole-cell pertussis vaccine (WCPV) is essential to approve the use of diphtheria, tetanus and whole cell pertussis (DTwP) vaccine (adsorbed) in childhood vaccination programs. Objective: To evaluate the influence of sex and of the mouse strains (NIH and BALB/cAn) on MWGT of the reference WCPV, pertussis toxin (PT) and 36 samples of DTwP vaccines. Method: Ten animals of each sex and strain were weighed, and then inoculated intraperitoneally with 0.5 mL/mouse of the reference WCPV, of PT (0.25-2.0 μg/animal), or DTwP vaccines. Control groups for WCPV and PT were inoculated with PBS and for DTwP vaccines 0.9% sodium chloride was used with 100 ppm of thimerosal. The test is satisfactory if there are no deaths, if the average weight gain (AWG) of the inoculated animals on the 3rd day is higher than the initial one and if on the 7th day the AWG is equal to or greater than 60% of the control. The MWGT results were evaluated by the current and by the proposed criteria on the 7th day, in which the lower limit of the 95% confidence interval of the AWG was equal to or greater than 60% of the control. Results: The reference WCPV was satisfactory in NIH and BALB/cAn females and unsatisfactory in males of both strains considering both criteria. The MWGT in both sexes and strains revealed low sensitivity in detecting the effect of isolated PT (0.25-2.0μg/mouse). DTwP vaccines were satisfactory in NIH mice of both sexes and in BALB/cAn females, but the result was unsatisfactory for 14.0% of DTwP vaccines in BALB/cAn males by both criteria. Conclusions: The MWGT of DTwP vaccines in female mice of both strains should be considered as it has been shown that NIH and BALB/cAn females are suitable for the MWGT. The adoption of the criterion proposed in the 7th day should be stimulated as it increases the sensitivity and precision of the MWGT. Introdução: O teste de ganho de peso em camundongos (TGPC) para a determinação da toxicidade da vacina pertussis de células inteiras (VPCI) é essencial para aprovar o emprego da vacina adsorvida contra a difteria, o tétano e a pertussis (DTP) nos programas de vacinação infantil. Objetivo: Avaliar a influência do sexo e das linhagens de camundongo (NIH e BALB/c An) no TGPC da VPCI de referência, da toxina pertussis (TP) e de 36 amostras de vacinas DTP. Método: Dez animais de cada sexo e linhagem foram pesados e, em seguida, inoculados intraperitonealmente com 0,5 mL/camundongo da VPCI de referência, de TP (0,25-2,0 μg/animal) ou de vacinas DTP. Grupos-controle para VPCI e TP foram inoculados com PBS e para vacinas DTP empregou-se o cloreto de sódio 0,9% com 100 ppm de timerosal. O teste é satisfatório se não ocorrerem mortes, se o ganho de peso médio (GPM) dos animais inoculados no 3° dia for superior ao inicial e no 7° dia o GPM for igual ou maior que 60% do controle. Os resultados do TGPC foram avaliados pelos critérios em vigência e pelo proposto no 7° dia, no qual o limite inferior do intervalo de confiança de 95% do GPM seja igual ou maior que 60% do controle. Resultados: A VPCI de referência foi satisfatória em fêmeas NIH e BALB/cAn e insatisfatória em machos de ambas as linhagens considerando-se ambos os critérios. O TGPC em ambas as linhagens e sexos revelou baixa sensibilidade na detecção do efeito da TP isolada (0,25-2,0μg/camundongo). As vacinas DTP foram satisfatórias em camundongos NIH de ambos os sexos e em fêmeas BALB/cAn, porém o resultado foi insatisfatório para 14,0% das vacinas DTP em machos BALB/cAn por ambos os critérios. Conclusões: O TGPC de vacinas DTP em camundongos fêmeas de ambas as linhagens deve ser considerado, pois evidenciou-se que fêmeas NIH e BALB/cAn são adequadas para a realização do TGPC. A adoção do critério proposto no 7° dia deve ser estimulado por aumentar a sensibilidade e precisão do TGPC.
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- 2021
4. Gasoline-station workers in Brazil: Benzene exposure; Genotoxic and immunotoxic effects
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Poça, Katia Soares da, primary, Giardini, Isabela, additional, Silva, Paula Vieira Baptista, additional, Geraldino, Barbara Rodrigues, additional, Bellomo, Antonella, additional, Alves, Julia Araújo, additional, Conde, Taline Ramos, additional, Zamith, Helena Pereira da Silva, additional, Otero, Ubirani Barros, additional, Ferraris, Fausto Klabund, additional, Friedrich, Karen, additional, and Sarpa, Marcia, additional
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- 2021
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5. The quantitative analysis of the mechanism involved in pertussis toxin-mediated cell clustering and its implications in the in vitro quality control of diphtheria tetanus and whole cell pertussis vaccines
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Zamith, Helena Pereira da Silva, primary, Godinho, Rosely Oliveira, additional, da Costa Junior, Valter Luiz, additional, and Corrado, Alexandre Pinto, additional
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- 2021
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6. In vitro genotoxicity of nitroimidazoles as a tool in the search of new trypanocidal agents
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Von Trompowsky, Ana Claudia Manoel, primary, Conde, Taline Ramos, additional, Lemos, Renata Calil, additional, Quaresma, Bruna Maria CS, additional, Pitombeira, Marcelly Cristina SR, additional, de Carvalho, Alcione Silva, additional, Boechat, Núbia, additional, Salomão, Kelly, additional, de Castro, Solange Lisboa, additional, and Zamith, Helena Pereira da Silva, additional
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- 2019
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7. Avaliação da característica de personalização dos medicamentos magistrais manipulados pelas farmácias comunitárias com Autorização Especial quanto à individualização da dose
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Pontes, Francisco Eduardo de and Zamith, Helena Pereira da Silva
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Autorização Especial ,Medicamento Manipulado ,Pharmaceutical Compounding ,Community Pharmacy ,Special Authorization ,Nova Friburgo ,Farmácia Comunitária - Abstract
The main purpose of compounding medicines is to meet individual needs, such as therapeutic dose, appropriate dosage forms, and absence of pharmaceutical ingredients for patients with a history of intolerance, among other technical reasons. This work analyzes, through documentary research, the compounding formula for dosage individualization of oral capsules/mono drug containing an Active Pharmaceutical Ingredient (API), according to Order No. 344/98, and prepared by community pharmacies located in Nova Friburgo, Rio de Janeiro. Data were recorded in November 2006, from prescription books of pharmacies with Special Authorization issued by ANVISA (Brazilian National Health Surveillance Agency). From the 12253 analyzed formulae, 22% met the inclusion criteria of this study. The results lead us to the conclusion that the prevalence of compounded medication for dosage individualization was low. On average, only 34% of the formulae presented a different dosage from the standard one in the available specialties on the Brazilian pharmaceutical market, which results in a diminution of personalized, compounded medications. This study therefore highlights the need of a more substantial risk assessment to justify the compounding of real compounded prescriptions. A manipulação de medicamentos magistrais possui como objetivo fundamental o atendimento a necessidades individuais, configurando sua personalização, seja em termos da dose terapêutica, forma farmacêutica adequada para uso, ausência de insumos farmacêuticos para pacientes com histórico de intolerância, entre outras justificativas técnicas. O presente estudo avaliou a característica magistral, no que se refere à individualização da dose, das cápsulas de uso oral/monodroga contendo insumo farmacêutico ativo (IFA) constante da Portaria SVS/MS nº 344/98, manipuladas pelas farmácias comunitárias de Nova Friburgo (RJ), por meio de pesquisa documental. Foram avaliados os registros do mês de novembro de 2006 dos livros de receituário das farmácias com Autorização Especial concedida pela Agência Nacional de Vigilância Sanitária (ANVISA), totalizando 12.253 fórmulas; 22% deste total preenchiam os critérios de inclusão do estudo. Os resultados da investigação nos permitiram concluir que havia baixa frequência de medicamentos manipulados em doses individualizadas, somente 34%, em média, possuíam doses diferentes das doses padronizadas nas especialidades farmacêuticas disponíveis no mercado brasileiro, o que os descaracterizariam como medicamentos magistrais, personalizados. Nesse sentido, os resultados do estudo nos apontam para a necessidade de uma avaliação de risco criteriosa, que justifique a manipulação de medicamentos realmente magistrais.
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- 2016
8. Determinação de bisfenol A em fórmulas infantis
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Bomfim, Marcus Vinicius Justo, Silvestre, Fábio Bazilio, Zamith, Helena Pereira da Silva, and Abrantes, Shirley de Mello Pereira
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Eficiência ,Food and Nutrition Security ,Disruptores Endócrinos ,Segurança Alimentar e Nutricional ,Fórmula Infantil ,Endocrine Disrupter ,High Pressure Liquid Chromatography ,Infant Formula ,Cromatografia Líquida de Alta Pressão - Abstract
Bisphenol A (BPA) is an endocrine disruptor and may present a serious toxicological and public health risk even at low doses. This problem has received widespread attention from the scientific community and food safety organizations. BPA is mainly used in the production of polycarbonate and epoxy resins, and can be transferred from plastic materials to food. The aim of the present study was determine the amount of BPA in samples of infant formula powder. The concentrations ranged from 0.2 to 10.2 µg/kg of sample, which is below the specific migration limit of BPA established by the European Union and Brazil. However, adverse effects on human health due to exposure to BPA are still possible at low doses. The scenario is complex, involves other forms of exposure and it still raises concern of authorities and entities involved in risk prevention and food safety. Desreguladores endócrinos, como o bisfenol A (BFA), podem representar um sério risco toxicológico e de saúde pública, principalmente pela ação em baixas doses e, por isso, tem recebido atenção da comunidade científica e de organizações relacionadas à segurança alimentar. É utilizado principalmente na produção de um tipo de plástico denominado policarbonato (PC) e na formação de resinas epóxi. O PC está presente em produtos de uso diário recipientes e materiais de cozinha e garrafas de água. As resinas epóxi são utilizadas como revestimento interno de latas de alimentos e bebidas. Em contato com o alimento, a substância pode ser transferida a partir do material plástico. O objetivo do trabalho foi quantificar a presença de BFA em amostras de fórmula infantil em pó. As concentrações oscilaram entre 0,2 a 10,2 µg/kg da amostra. Os resultados obtidos atestam que as amostras analisadas estão abaixo do limite de migração específica (LME) para o BFA definido pela União Europeia e pelo Brasil. Contudo, não exclui a possibilidade de ocorrência de efeitos adversos sobre a saúde humana em decorrência da exposição ao BFA mesmo em baixas doses. O cenário é complexo, envolve outras formas de exposição e ainda é alvo de preocupação de autoridades e entidades envolvidas com a prevenção de riscos e segurança alimentar.
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- 2015
9. Validação de método analítico para determinar a migração de ε-caprolactama das embalagens para alimentos gordurosos
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Bomfim, Marcus Vinicius Justo, Abrantes, Shirley de Mello Pereira, and Zamith, Helena Pereira da Silva
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validation ,nylon 6 ,caprolactam - Abstract
ε-Caprolactam (CAP) is a monomer of nylon 6 used as food packaging for bologna sausage, turkey blanquettes, fowl breast, pâtés and ham luncheon meat. After polymerization a part of the monomer can remain in the packaging and migrate into the food. The aim of this work was develop and validate a single laboratory method to determine CAP in ethanol 95% that simulates fatty food characteristics. Thus, linear range was 2 to 32 mg/L of CAP, detection and quantification limits were 0.83 and 1.63 mg/L, respectively. Repeatability showed Hor Rat values lower than 2 while recovery range was 97.5 to 106.5%. The method was considered adequate for purpose.
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- 2010
10. Determinação de bisfenol A em fórmulas infantis
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Bomfim, Marcus Vinicius Justo, primary, Silvestre, Fábio Bazilio, additional, Zamith, Helena Pereira da Silva, additional, and Abrantes, Shirley De Mello Pereira, additional
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- 2014
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11. Megazol and its bioisostere 4H-1,2,4-triazole: comparing the trypanocidal, cytotoxic and genotoxic activities and their in vitro and in silico interactions with the Trypanosoma brucei nitroreductase enzyme
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Carvalho, Alcione Silva de, primary, Salomão, Kelly, additional, Castro, Solange Lisboa de, additional, Conde, Taline Ramos, additional, Zamith, Helena Pereira da Silva, additional, Caffarena, Ernesto Raúl, additional, Hall, Belinda Suzette, additional, Wilkinson, Shane Robert, additional, and Boechat, Núbia, additional
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- 2014
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12. Development of a brazilian nanoencapsulated drug for schistosomiasis treatment
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Da Fonseca, Laís Bastos, primary, Viçosa, Alessandra Lifsitch, additional, Mattos, Ana Carolina Alves, additional, Coelho, Paulo Marcos Zech, additional, Araújo, Neusa, additional, Zamith, Helena Pereira da Silva, additional, Volpato, Nadia Maria, additional, Nele, Márcio, additional, and Pinto, José Carlos Costa da Silva, additional
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- 2013
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13. Desenvolvimento de um medicamento brasileiro nanoencapsulado para o tratamento da esquistossomose
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Da Fonseca, Laís Bastos, primary, Viçosa, Alessandra Lifsitch, additional, Mattos, Ana Carolina Alves, additional, Coelho, Paulo Marcos Zech, additional, Araújo, Neusa, additional, Zamith, Helena Pereira da Silva, additional, Volpato, Nadia Maria, additional, Nele, Márcio, additional, and Pinto, José Carlos Costa da Silva, additional
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- 2013
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14. Perfil dos medicamentos manipulados pelas farmácias comunitárias com Autorização Especial
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Pontes, Francisco Eduardo de, primary and Zamith, Helena Pereira da Silva, additional
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- 2012
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15. Identification of fatty foods with contamination possibilities by plasticizers when stored in PVC film packaging
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Barros, Hilda Duval, primary, Zamith, Helena Pereira da Silva, additional, Bazílio, Fábio Silvestre, additional, Carvalho, Lucia Jaeger de, additional, and Abrantes, Shirley de Mello Pereira, additional
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- 2011
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16. Validação de método analítico para determinar a migração de ε-caprolactama das embalagens para alimentos gordurosos
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Bomfim, Marcus Vinicius Justo, primary, Abrantes, Shirley de Mello Pereira, additional, and Zamith, Helena Pereira da Silva, additional
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- 2010
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17. Estudos sobre a toxicologia da ε-caprolactama
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Bomfim, Marcus Vinicius Justo, primary, Abrantes, Shirley de Mello Pereira, additional, and Zamith, Helena Pereira da Silva, additional
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- 2009
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18. Astaxantina: seu uso como corante natural alimentício
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FERREIRA, Micheli de Moraes, primary, ZAMITH, Helena Pereira da Silva, additional, and ABRANTES, Shirley, additional
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- 2000
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19. Evaluation of the cytotoxicity and genotoxicity of the methanolic extract of Chrysobalanus icaco L leaves
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Cruz, Letícia Oliveira da, Araujo, Adriano Caldeira de, Dantas, Flávio José da Silva, Gurgel, Claudia Simões, Moraes, Milton Ozório, and Zamith, Helena Pereira da Silva
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Extrato metanólico ,Plantas medicinais - Toxicologia ,Genotoxicidade ,Citotoxicidade ,Cytotoxicity ,Plantas medicinais ,Plasmídeo ,Linhagem celular ,Plasmid ,Methanolic extract ,Genotoxicity ,CIENCIAS BIOLOGICAS::BOTANICA::BOTANICA APLICADA [CNPQ] ,Cell line ,Abajeru - Abstract
Submitted by Boris Flegr (boris@uerj.br) on 2021-01-05T18:24:43Z No. of bitstreams: 1 DISSERTACAO LETICIA CRUZ.pdf: 1939773 bytes, checksum: d0508ddb84adb8d2b3052b7494978cd1 (MD5) Made available in DSpace on 2021-01-05T18:24:43Z (GMT). No. of bitstreams: 1 DISSERTACAO LETICIA CRUZ.pdf: 1939773 bytes, checksum: d0508ddb84adb8d2b3052b7494978cd1 (MD5) Previous issue date: 2015-02-11 Coordenação de Aperfeiçoamento de Pessoal de Nível Superior Medicinal plants are used for the treatment and cure of various diseases since the dawn of humanity, because of their therapeutic properties. In Brazil, this practice has been influenced by Indian, African and European civilizations. From the popular knowledge, these plant species are used in different forms such as teas, potions, baths, essential oils and cuisine. The diversity of special metabolites present in different parts of the plants has attracted great interest from the pharmaceutical industry, with currently over 25% of marketed drugs are derived, directly or indirectly, of medicinal plants. Among them, Chrysobalanus icaco L., or abajeru as it is popularly known, has many biological activities, detacando the effects: antiviral and hypoglycemic. The literature suggests isolating one triterpene (pomólico acid) from the methanol extract of this plant, capable of inhibiting growth and inducing apoptosis in a erythroleukemic cell line. In order to confirm this activity in other tumor type, samples of C. icaco were collected in the Parque das Dunas, Cabo Frio, RJ, and extracts were prepared from leaves immersed in methanol (200 g / L). Human lung carcinoma cells (A549 strain) and a normal line (MRC5) were treated with different concentrations of extract. After the 24 hour treatment period, the cytotoxic activity was assayed by blue exclusion method and trypan clonogenic recovery, while the genotoxic by the comet assay. The most cytotoxic effect was observed when cells were exposed to I2FP extract at concentrations of 6.25 and 12.5 ug / ml. Additionally, the genotypes of both the cell lines and plants, can play an important role in these effects since the cancer cells showed reduced mitogenic capacity and observed DNA damage in cells by the comet assay. The chromatographic analysis of the extract was performed by high performance liquid chromatography (HPLC), and it was detected, mostly, phenolic compounds such as flavones. The histochemical technique of the leaf also detected the presence of phenolic compounds other alkaloids. The treatment with plasmids extracts induce breaks in DNA, in addition to increasing the transforming capacity thereof. Finally, the survival rate was lower in tumor cell line A549 cells than in normal cells (MRC5). It has been shown the potential cytotoxic, genotoxic and anti-genotoxic the methanol extract of C. icaco in different biological systems and secondary metabolites may be responsible for the activities identified in this study. In addition to emphasizing the need to be careful in the indiscriminate use of these extracts as well as any other product, called by the people of "natural" Plantas medicinais são empregadas para o tratamento e cura de várias doenças desde os primórdios da humanidade, devido às suas propriedades terapêuticas. No Brasil, esta prática tem sido influenciada pelas civilizações indígena, africana e européia. A partir do conhecimento popular, essas espécies de plantas são usadas em diferentes formas, como chás, garrafadas, banhos, óleos essenciais e na culinária. A diversidade de metabólitos especiais presentes em diferentes partes das plantas tem despertado grande interesse da indústria farmacêutica, sendo que, atualmente, mais de 25% dos medicamentos comercializados são derivados, direta ou indiretamente, de plantas medicinais. Dentre elas, Chrysobalanus icaco L., ou abajeru, como é popularmente conhecida, apresenta, muitas atividades biológicas, detacando-se os efeitos: antiviral e hipoglicemiante. A literatura cita o isolamento um triterpeno (ácido pomólico), a partir do extrato metanólico dessa planta, capaz de inibir o crescimento e induzir apoptose em uma linhagem celular eritroleucémica. Com o objetivo de confirmar essa atividade em outra linhagem tumoral, amostras de C. icaco foram coletadas no Parque das Dunas, Cabo Frio , RJ, e extratos foram preparados a partir de folhas imersas em metanol (200 g/L). Células pulmonares humanas de carcinoma (linhagem A549) e linhagem normal (MRC5) foram tratadas com diferentes concentrações desse extrato. Após o período de tratamento de 24 horas, a atividade citotóxica foi analisada pelos métodos de exclusão de azul de trypan e recuperação clonogenica, enquanto que a genotóxica, pelo ensaio cometa. O maior efeito citotóxico foi observado quando as células foram expostas ao extrato I2FP nas concentrações de 6,25 e 12,5 μg/mL. Complementarmente, os genótipos, tanto das plantas como das linhagens celulares, podem desempenhar um papel importante nestes efeitos, uma vez que as células neoplásicas mostraram diminuição da capacidade mitogênica e observou-se danos no DNA das células pelo ensaio cometa. A análise cromatográfica do extrato foi realizada por cromatografia líquida de alta eficiência (CLAE), tendo-se detectado, majoritariamente, compostos fenólicos, tais como as flavonas. A técnica de histoquímica da lâmina foliar também detectou a presença de compostos fenólicos, além de alcalóides. O tratamento de plasmídeos com os extratos induziu quebras no DNA, além de aumentar a capacidade transformante dos mesmos. Finalmente, a taxa de sobrevivência foi menor na linhagem tumoral A549 do que nas células normais (MRC5). Demonstrou-se os potenciais citotóxico, genotóxico e anti-genotóxico do extrato metanólico de C. icaco em diferentes sistemas biológicos e que metabólitos secundários possam ser responsáveis pelas atividades detectadas neste estudo. Além de enfatizar a necessidade de se ter cuidado no uso indiscriminado destes extratos, assim como de qualquer outro produto, chamado pela população de natural
- Published
- 2015
20. Evaluation of genotoxicity and antigenotoxicity of astaxanthin by the Comet assay in mammalian cells in vitro 2013
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Ferreira, Micheli de Moraes, Abrantes, Shirley de Mello Pereira, Zamith, Helena Pereira da Silva, Azevedo-Meleiro, Cristiane Hess de, and Silva, Marco Antonio Mota da
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Genotoxicidade ,Ci?ncia e Tecnologia de Alimentos ,Ensaio cometa ,Caroten?ides ,Genotoxicity ,Comet assays ,Carotenoids - Abstract
Submitted by Leticia Schettini (leticia@ufrrj.br) on 2022-03-14T14:21:46Z No. of bitstreams: 1 2013 - Micheli de Moraes Ferreira.pdf: 1455175 bytes, checksum: 5c2f286e2f1aada2fb86e881eab57e01 (MD5) Made available in DSpace on 2022-03-14T14:21:47Z (GMT). No. of bitstreams: 1 2013 - Micheli de Moraes Ferreira.pdf: 1455175 bytes, checksum: 5c2f286e2f1aada2fb86e881eab57e01 (MD5) Previous issue date: 2013-07-30 CAPES The color and appearance of food are the first fundamental attributes, if not more important, to be evaluated by consumers at the time of its acquisition. The food can be more nutritious, safer and more economical, however, if not attractive, its acquisition will not occur. The salmon is basically a white fish that becomes pink by eating shrimp. The stored red pigment present in muscle or shrimp in the shell and accumulates in adipose tissue is acquired through ingestion algae and unicellular organisms by the shrimps from the sea. Carotenoids used in food, pharmaceutical, cosmetics and food are natural colorants responsible for yellow, orange and red. The raised salmon aquaculture has no access to the bodies mentioned above, however, it is added to their feed astaxanthin (ATX), a substance that gives a pinkish color to your meat. ATX (3,3 '-dihydroxy-beta, beta-carotene-4, 4'-dione) is a oxygenated carotenoid pigment that confers the characteristic reddish-pink coloration of certain fish, crustaceans, birds and microorganisms. The ATX has potent activity in scavenging free radicals and protecting against lipid peroxidation and the damage caused by oxidation of cell membranes and tissues. In this study we investigated in human blood cells in vitro genotoxicity and protective effect or antigenotoxicity ATX induction of oxidative DNA damage caused by hydrogen peroxide (H2O2). ATX (0.1 to 5 ?M) was not cytotoxic in human blood cells are cytotoxic in the range 10-1000 ?M inducing 1 to 10% mortality when compared to control cell-solvent dimethylsulfoxide (DMSO 5%). The ATX Comet assays performed did not induce DNA damage (p> 0.1) on human blood cells tested in the range 0.1 to 500 ?M compared to the 5% DMSO. H2O2 (12.5 to 2000 ?M) was not cytotoxic and did not cause cell lethality in human blood cells but was genotoxic (p 0,1) em c?lulas sangu?neas humanas na faixa testada de 0,1 a 500 ?M quando comparado ao DMSO 5%.. O H2O2 (12,5 a 2000 ?M) n?o foi citot?xico n?o causando letalidade celular em c?lulas sangu?neas humanas, por?m foi genot?xico (p
- Published
- 2013
21. Bacillus cereus: Isolation, Counting and Detection of enterotoxins by PCR in commercially roasted and ground coffee samples In Rio de Janeiro city
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Souza, Cyllene de Matos Ornelas da Cunha Corr?a de, Abrantes, Shirley de Mello Pereira, Amendoeira, Maria Regina Reis, Freitas, Sidinea Cordeiro de, Zamith, Helena Pereira da Silva, and Luchese, Rosa Helena
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Caf? ,contamination ,Bacillus cereus ,Ci?ncia e Tecnologia de Alimentos ,coffee ,contamina??o - Abstract
Submitted by Sandra Pereira (srpereira@ufrrj.br) on 2020-08-21T00:56:40Z No. of bitstreams: 1 2011 - Cyllene de Matos Ornelas da Cunha Corr?a de Souza.pdf: 954640 bytes, checksum: acab6a0de78f1ddb78e58879f2020864 (MD5) Made available in DSpace on 2020-08-21T00:56:40Z (GMT). No. of bitstreams: 1 2011 - Cyllene de Matos Ornelas da Cunha Corr?a de Souza.pdf: 954640 bytes, checksum: acab6a0de78f1ddb78e58879f2020864 (MD5) Previous issue date: 2011-08-01 Coffee is one of the most appreciated drinks in the world. Coffee grounds are obtained from the fruit of a small plant that belongs to the genus Coffea. Coffea arabica and Coffea canephora robusta are the two species of highest commercial importance. They are more commonly known as arabica and robusta, respectively. Two-thirds of Coffea arabica plants are grown in South and Central America and Eastern Africa (the place of origin for this coffee species). Contamination with microorganisms has been a major factor affecting coffee quality, due to the method of harvest adopted in Brazil. Brazilian harvests are based on mixing fruits collected from the ground with those that fall on cloths. As the Bacillus cereus bacterium frequently uses soil as an environmental reservoir, it is easily capable of becoming a contaminant. In the current study, microbiological analysis and polymerase chain reaction (PCR) analysis of the toxicogenic profile of isolated strains were used to evaluate B. cereus contamination in commercial samples of ground and roasted coffee in the city of Rio de Janeiro. The results revealed a significant frequency of these enterotoxin genes in isolated strains, which were: The HBL (57%); HBL C (71%); HBL D (64%); The NHE (50%); NHE B (100%) ; NHE C (64%). Strains of B.thuringiensis were also found in 44% of the samples. O caf? ? uma das bebidas mais consumidas e apreciadas no mundo. O gr?o de caf? ? obtido da fruta da planta, um arbusto pequeno, pertencente ao g?nero Coffea. Duas esp?cies t?m import?ncia comercial: Coffea arabica e Coffea canephora robusta; conhecidas como arabica e robusta. Cerca de dois ter?os da esp?cie Coffea arabica cresce principalmente na Am?rica do Sul, Am?rica Central e Leste da ?frica (origem deste caf?). A incid?ncia de microrganismos tem sido um dos principais fatores envolvidos na qualidade do caf?, principalmente na modalidade de colheita e preparo adotada no Brasil, isto ?, a colheita baseada na mistura de frutos derri?ados no ch?o com os derri?ados no pano. A bact?ria Bacillus cereus, que utiliza freq?entemente o solo e o meio ambiente como reservat?rio pode ser adicionado a esta lista de microrganismos. No presente estudo, avaliouse a contamina??o de B. cereus em amostras de caf? torrado e mo?do comercializado na cidade do Rio de janeiro, atrav?s de an?lises microbiol?gicas e an?lise do perfil toxig?nico das cepas isoladas atrav?s da Rea??o em Cadeia da Polimerase (PCR), considerando-se os complexos HBL e NHE. Os resultados revelaram elevada freq??ncia desses genes de enterotoxinas nas cepas isoladas, que foram: HBL A (57%); HBL C (71%); HBL D (64%); NHE A (50 %); NHE B (100%); NHE C (64%). Cepas de B. thuringiensis foram encontradas em 44% das amostras analisadas.
- Published
- 2011
22. Involvement of base excision repair enzymes in restoring ultraviolet A and stannous chloride induced lesions in Escherichia coli
- Author
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Motta, Ellen Serri da, Mattos, José Carlos Pelielo de, Zamith, Helena Pereira da Silva, Leitão, álvaro Augusto da Costa, Asad, Nasser Ribeiro, and Dantas, Flávio José da Silva
- Subjects
Base excision repair ,Stannous chloride ,Radiação ultravioleta A ,CIENCIAS BIOLOGICAS::BIOFISICA::RADIOLOGIA E FOTOBIOLOGIA [CNPQ] ,Escherichia coli ,Cloreto estanoso ,Ultraviolet radiaton A ,Estanho ,Reparo por excisão de bases - Abstract
Submitted by Boris Flegr (boris@uerj.br) on 2021-01-06T20:52:35Z No. of bitstreams: 1 Ellen Serri da Motta.pdf: 3123994 bytes, checksum: 875973e718a730fafc4b492a32e4054f (MD5) Made available in DSpace on 2021-01-06T20:52:35Z (GMT). No. of bitstreams: 1 Ellen Serri da Motta.pdf: 3123994 bytes, checksum: 875973e718a730fafc4b492a32e4054f (MD5) Previous issue date: 2010-03-30 Coordenação de Aperfeiçoamento de Pessoal de Nível Superior Stannous chloride (SnCl2) and ultraviolet radiation A (UVA) are able to induce lesions in different cellular structures, including DNA, manly through ROS generation. The aim of this work was to study the mutagenesis and repair of lesions induced by the association of UVA (pre treatment) with SnCl2. It was evaluated the action of base excision repair (BER) enzymes in Escherichia coli (E. coli) by alkaline gel electrophoresis and bacterial survival. It was also evaluated the SoxRS system induction by chromotest and mutagenesis through the Ames test. According to the results: i) UVA induced DNA strand breaks in all strains and fpg-nfo and fpg mutants showed greater delay in the repair of lesions; ii) SnCl2 induced more breaks than UVA and nfo and fpg mutants showed more difficult to repair the damage; iii) UVA + SnCl2 caused more breaks than the SnCl2 and nfo and fpg mutants also showed a slowest repair of injuries; iv) UVA did not inactivate any bacterial strains tested; v) nfo and fpg strains were more sensitive to SnCl2; vi) UVA + SnCl2 caused higher mortality in all strains tested, when compared to SnCl2, and, again, nfo and fpg mutants were the most sensitives to the treatment with both agents; vii) the transformation of nfo mutant with the plasmid pBW21 (nfo+) and fpg mutants with plasmid pFPG (fpg+) increased the survival of the strains to SnCl2 and UVA + SnCl2 treatments; viii) SnCl2 was able to induce SoxRS system; ix) SnCl2, UVA + SnCl2 and UVA did not induce mutagenesis; x) damage repair seems to be preferentially performed by Fpg and Nfo proteins. O cloreto estanoso (SnCl2) e a radiação ultravioleta A (UVA) são agentes que lesam diversas estruturas celulares, inclusive o DNA, principalmente pela geração de espécies reativas de oxigênio. O objetivo deste trabalho foi estudar a mutagênese e o reparo das lesões produzidas pela combinação do UVA, na condição de préiluminação, com o SnCl2. Avaliou-se a ação de enzimas do reparo por excisão de bases (BER), em Escherichia coli (E. coli), por eletroforese em gel alcalino de agarose e sobrevivência bacteriana. Também se estudou a indução do sistema SoxRS pelo cromoteste, e a mutagênese pelo teste de Ames. De acordo com os resultados: i) o UVA induziu quebras no DNA das cepas testadas e os mutantes fpgnfo e fpg apresentaram maior retardo no reparo das lesões; ii) o SnCl2 induziu mais quebras que o UVA e os mutantes nfo e fpg mostraram maior dificuldade em reparar as lesões; iii) o UVA+SnCl2 provocou mais quebras que o SnCl2 e os mutantes nfo e fpg também apresentaram maior lentidão no reparo das lesões; iv) o UVA não inativou as cepas testadas; v) as cepas nfo e fpg foram as mais sensíveis ao SnCl2; vi) o UVA+SnCl2 provocou maior letalidade em todas as cepas testadas, em relação ao SnCl2, e os mutantes nfo e fpg também foram os mais sensíveis ao tratamento com ambos os agentes; vii) a transformação dos mutantes nfo com o plasmídio pBW21 (nfo+) e dos mutantes fpg com o plasmídio pFPG (fpg+) aumentou a sobrevivência das cepas aos tratamentos com SnCl2 e UVA+SnCl2; viii) o SnCl2 induziu o sistema SoxRS; ix) o SnCl2, UVA e UVA+SnCl2 não induziram mutagênese; x) o reparo das lesões parece ser preferencialmente realizado pelas proteínas Fpg e Nfo.
- Published
- 2010
23. Monitoring the quality of the water used in mobile dialysis services in intensive care units in the city of Rio de Janeiro.
- Author
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Jesus PR, Ferreira JAB, Carmo JDS, Albertino SRG, Vicentini Neto SA, Santos LMGD, and Zamith HPDS
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- Brazil, Dialysis Solutions, Humans, Intensive Care Units, Renal Dialysis, Water Microbiology
- Abstract
Introduction: Monitoring water quality in mobile dialysis (MD) services, assessing critical points and characterizing the risks inherent in the process, is essential to avoid risks to the patient's health. This study evaluated the microbiological quality of water in the MD of 36 hospitals with intensive treatment in the city of Rio de Janeiro., Methods: 204 water samples were collected from the points of entry to the network (NET), post-osmosis (PO) and dialysis solution (DS). The samples were evaluated for heterotrophic bacteria count, pathogen search, presence of endotoxins and aluminum content., Results: Bacterial contamination at 3 collection points in 36 hospitals was 30% (32/108); 42% from DS, 31% from PO and 17% from NET, with the presence of Pseudomonas aeruginosa, Stenotrophomonas maltophilia , Burkholderia cepacia and Ralstonia pickettii in the 3 points. Endotoxin concentrations above 0.25 EU/mL occurred in 77% of the samples (17/22) analyzed in the PO. In the aluminum content, values above 0.01 mg/L were presented in 47% (7/15) of PO samples and 27% (4/15) of NET samples. There is no specific legislation for water used in the MD; therefore, the limits of the RDC of the National Health Surveillance Agency (Anvisa) 11/2014 were used; which regulates conventional hemodialysis services., Conclusion: The results highlight the importance of evaluating water quality in MD services to ensure patient safety and support the sanitary monitoring of this process as a healthcare promoter.
- Published
- 2022
- Full Text
- View/download PDF
24. Gasoline-station workers in Brazil: Benzene exposure; Genotoxic and immunotoxic effects.
- Author
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Poça KSD, Giardini I, Silva PVB, Geraldino BR, Bellomo A, Alves JA, Conde TR, Zamith HPDS, Otero UB, Ferraris FK, Friedrich K, and Sarpa M
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- Adult, Aged, Air Pollutants, Occupational toxicity, Brazil epidemiology, Comet Assay, Cross-Sectional Studies, DNA Damage drug effects, DNA Damage immunology, Female, Humans, Immune System metabolism, Immunomodulation drug effects, Inhalation Exposure adverse effects, Inhalation Exposure analysis, Lymphocyte Count, Male, Micronucleus Tests, Middle Aged, Mutagenicity Tests, Stress, Physiological drug effects, Stress, Physiological immunology, T-Lymphocytes drug effects, T-Lymphocytes pathology, Young Adult, Benzene toxicity, Gasoline toxicity, Immune System drug effects, Occupational Exposure adverse effects, Occupational Exposure analysis, Occupational Exposure statistics & numerical data
- Abstract
Chronic exposure to benzene is a risk factor for hematological malignancies. Gasoline-station workers are exposed to benzene in gasoline, via both inhalation and dermal contact (attendants and managers) or inhalation (workers in the on-site convenience stores and offices). We have studied the exposure of these workers to benzene and the resulting genotoxic and immunotoxic effects. Levels of urinary trans, trans-muconic acid were higher among gasoline-station workers than among office workers with no known exposure to benzene (comparison group). Among the exposed workers, we observed statistically significant biological effects, including elevated DNA damage (comet assay); higher frequencies of micronuclei and nuclear buds (CBMN assay); lower levels of T-helper lymphocytes and naive Th lymphocytes; lower CD4 / CD8 ratio; and higher levels of NK cells and memory Th lymphocytes. Both groups of exposed workers (inhalation and inhalation + dermal routes) showed similar genotoxic and immunotoxic effects., (Copyright © 2021 Elsevier B.V. All rights reserved.)
- Published
- 2021
- Full Text
- View/download PDF
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