5 results on '"Gram's stain"'
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2. MICRORGANISMOS PSICROTRÓFICOS EM LEITES SUBMETIDOS À ULTRA ALTA TEMPERATURA ADQUIRIDOS EM CURITIBA, PARANÁ.
- Author
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SOUZA, E. S., ROSA, D. R., and GALVÃO, J. A.
- Subjects
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LIPOLYSIS , *GRAM'S stain , *EXTRACELLULAR enzymes , *BACTERIAL growth , *BACTERIAL cultures , *GELATION - Abstract
The beneficial effects of ultra-pasteurization milk treatment include elimination of milk pathogens, besides increasing the product's shelf-life, however, psychrotrophic bacteria are associated with several negative effects in the final product such as lipolysis, rancidification and gelation. This results from heat-resistant spores and its possible residual extracellular heat-resistant enzymes activity. With that in mind, this paper aimed to quantify psychrotrophic bacteria and perform a milk clotting test in UHT milk sold in Curitiba, Paraná. 60 samples from two brands were acquired (30 from A brand and 30 from B brand) each 15 days in different moments. Each time, 10 samples from a same batch were separated in two groups (D0 and D7), being D0: five samples analyzed in the purchase day, and D7: five samples analyzed after incubation at 37± 1ºC/7 days and evaluated regarding enumeration of psychrotrophic bacteria, Gram staining and milk clotting test. The heat-treating process effectiveness was evaluated by analyzing 30 samples from each brand, A and B, totalizing 60, being 10 from each different production batches, through the surface inoculation method in PCA, milk clotting test and classification of the isolated colonies by the Gram method. In D0, one (3,4%) sample (from A brand) resulted in Gram negative psychrotrophic growing (2,50 x 105 UFC/mL) . Samples from B brand did not result in bacterial growth. 25 samples (83,3%) did not clot, and five (16,7%) produced sponge clots. In D7, none of the samples presented bacterial growth, 20 (66,7%) did not clot and 10 (33,3%) produced sponge clots. Mesophilic bacterial culture was not done. The A brand UHT process did not grant sterilization regarding psychrotrophic bacteria, and the milk clotting results indicate possible coliforms contamination in both brands. Furthermore, clot absence in several samples could indicate preservatives usage, which is considered fraud. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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3. Avaliação da contaminação de resinas compostas utilizadas na clínica diária: estudo in vitro.
- Author
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Duarte Irala, Luis Eduardo, Zimmer, Roberto, Bordin da Luz, Nelise, Klein Junior, Celso Afonso, and Galia Reston, Eduardo
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MICROBIAL contamination ,BACTERIAL contamination ,GRAM'S stain ,DENTAL clinics ,TUBES - Abstract
Copyright of Stomatos is the property of Revista Stomatos and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2020
4. EVOLUÇÃO DAS TÉCNICAS DIAGNÓSTICAS EM MICROBIOLOGIA CLÍNICA.
- Author
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Morbi Perantoni, Larissa and Maria de Queiroz-Fernandes, Geisiany
- Subjects
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SCIENTIFIC literature , *MICROBIOLOGICAL techniques , *SCIENCE databases , *MICROSCOPY , *MASS spectrometry , *GRAM'S stain , *STAINS & staining (Microscopy) - Abstract
Introduction: Microbial identification is important due to its impact on both the patient and public health, because the rapid and accurate diagnosis allows of correct antibiotic treatment and control of infection. Currently, clinical microbiology laboratories are undergoing significant changes due to the development of automation systems, which enables faster and more accurate diagnosis. These advances were possible due to technological progress and the search for new strategies that reduced the costs of these tools, making them more accessible. Objective: This study aimed to highlight the importance of the implantation of new and advanced technologies in microbiology laboratories. Methodology: A review of scientific literature was carried out in scientific databases. Development: Traditional techniques of microbiological diagnosis include direct methods such as staining methods and optical microscopy to indirect methods such as culture and biochemical tests. The main problem is the fact that these techniques take time to provide a response to the clinician and, in many cases, need well-trained technicians for the correct interpretation of the results. It is, therefore, becoming increasingly important to develop rapid and accurate techniques. The innovative techniques include molecular biology, immunoassays, and mass spectrometry. Final considerations: Access to new technologies makes it possible to solve diagnostic issues that are increasingly challenging and also contribute to the improvement of the clinical setting and public health. [ABSTRACT FROM AUTHOR]
- Published
- 2019
5. Método alternativo y sostenible para realizar la tinción bacteriana Gram y Wirtz-Conklin: Relevancia ambiental y económica en la enseñanza práctica de microbiologia
- Author
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Reine, Fabricio Ueda, Souza, Lorena Aparecida Bianchi de, Menezes, Jéssica Lima de, Gomes, Rosana Ferreira Carli Cangussu, Souza, Aline Campos Reis de, Mota, Camila Alves, and Abreu Filho, Benício Alves de
- Subjects
Microorganismos ,Wirtz-Conklin stain ,Coloração de Gram ,Staphylococcus aureus ,Tinción de Gram ,Microrganismos ,Alicyclobacillus acidoterrestris ,Microorganisms ,Microbiologia ,Microbiología ,Microbiology ,Gram’s stain ,Coloração de Wirtz-Conklin ,Tinción de Wirtz-Conklin ,Escherichia coli ,Bacillus subtilis - Abstract
Stained preparations are the most commonly microscopic exam used in microbiology, as they provide a better view of microorganisms. Bearing in mind that Gram and Wirtz-Conklin staining techniques are commonly used in the routine of microbiology laboratories and in practical classes, this project aimed to compare the standard staining technique on slide surfaces, with the technique by immersion, which in turn can avoid waste of dyes, environmental impact and reduce laboratory and teaching costs. Thus, bacterial smears (Escherichia coli; Staphylococcus aureus; Alicyclobacillus acidoterrestris and Bacillus subtilis) were made on glass slides, followed by flame fixation. After, the slides were submitted to staining using the surface technique and the immersion technique. Subsequently, the slides were viewed under a standard optical microscope and the resolution of the images and tinting characteristics were evaluated and recorded. The staining by immersion, both for Gram stain and Wirtz-Conklin, avoided the waste of the dyes used in the techniques, as well as, the saturation of the solutions after many slide passes. Thus, the immersion staining technique is favorable for use in classes or microbiology laboratories. The application of this technique has shown significant results for the reduction of waste and, consequently, the impacts on the environment and the economy of educational institutions. Las preparaciones teñidas son los exámenes microscópicos más utilizados en microbiología, ya que proporcionan una mejor visión de los microorganismos. Teniendo en cuenta que las técnicas de tinción de Gram y Wirtz-Conklin se utilizan comúnmente en la rutina de los laboratorios de microbiología y en las clases de microscopía teñida, este proyecto tuvo como objetivo comparar la técnica de tinción estándar en superficies de portaobjetos, con la técnica de inmersión, que a su vez puede evitar el desperdicio de tintes, el impacto ambiental y reducir los costos de laboratorio y enseñanza. Por lo tanto, se hicieron frotis bacterianos (Escherichia coli; Staphylococcus aureus; Alicyclobacillus acidoterrestris y Bacillus subtilis) en portaobjetos, seguidos de fijación con llama. Después de este procedimiento, los portaobjetos se sometieron a tinción mediante la técnica de superficie y la técnica de inmersión. Posteriormente, los portaobjetos se visualizaron bajo un microscopio óptico estándar y se evaluó y registró la resolución de las imágenes y las características de tinción. La técnica de tinción por inmersión, tanto para la tinción de Gram como para Wirtz-Conklin, evitó el desperdicio de los colorantes utilizados en las técnicas, así como la saturación de las soluciones tras muchas pasadas de portaobjetos. Por tanto, la técnica de tinción por inmersión es favorable para su uso en clases o en laboratorios de microbiología. La aplicación de esta técnica ha mostrado resultados significativos para la reducción de residuos y, en consecuencia, los impactos sobre el medio ambiente y la economía de las instituciones educativas. As preparações coradas são os exames microscópicos mais comumente empregados em microbiologia, pois proporcionam uma melhor visualização dos microrganismos. Tendo em vista que as técnicas de coloração de Gram e Wirtz-Conklin são comumente utilizadas na rotina de laboratórios de microbiologia e nas aulas de microscopias coradas, este projeto teve como objetivo comparar a técnica padrão de coloração em superfície das lâminas, com a técnica por imersão, que por sua vez pode evitar o desperdício de corantes, impacto ambiental e diminuir custos laboratoriais e no ensino. Dessa forma, foram feitos esfregaços bacterianos (Escherichia coli; Staphylococcus aureus; Alicyclobacillus acidoterrestris e Bacillus subtilis) em lâmina, seguidos de fixação em chama. Após esse procedimento as lâminas foram submetidas à coloração pela técnica de superfície e pela técnica de imersão. Posteriormente as lâminas foram visualizadas em microscópio óptico comum e a resolução das imagens e características tintoriais foram avaliadas e registradas. A técnica de coloração por imersão, tanto para a coloração de Gram quanto para Wirtz-Conklin, evitou desperdício dos corantes utilizados nas técnicas, bem como, a saturação das soluções após muitas passagens de lâminas. Assim, a técnica de coloração por imersão é favorável para o uso nas aulas ou nos laboratórios de microbiologia. A aplicação dessa técnica mostrou resultados significativos para a diminuição do desperdício e, consequentemente, os impactos ao meio ambiente e à economia das instituições de ensino.
- Published
- 2021
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