A importância da lei de Gay-Lussac para a classificação dos compostos orgânicos

Camel, Tânia de Oliveira; Filgueiras, Carlos A. L.

doi:10.1590/s0100-40422013000500022

Cited by 2 publications

(2 citation statements)

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“…The flasks, before being incubated in a bacteriological oven, exhibited a pressure of 0 mmHg shortly after preparation at room temperature. Inside the microbiological oven at a temperature of 35 ± 2 • C, the constituent molecules of the broth cause agitation as a result of thermal energy transfer [42]. As a result, the vaporized molecules in the headspace collide with the walls of the flasks, generating force evidenced by the increase in intra-flask pressure.…”

Section: Definition Of the Maximum And Minimum Pressure For The Detection Time Of Microbial Activitymentioning

confidence: 99%

Development of a Manometric Monitoring Method for Early Detection of Air Microbiological Contamination in the Bloodstream

Neto

Pinheiro

Santos³

et al. 2021

Atmosphere

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Atmospheric air is a microbial habitat of pathogenic bioaerosols that may pose serious risks to humans. A commonly laboratory-based approach for the diagnosis of such infections in the bloodstream is the blood culture analysis. Its clinical relevance is attributed to the fact that these infections are characterized by high rates of morbidity and mortality, requiring the need for efficient methods for rapid diagnosis. For this reason, our study aimed to develop a method of manometric monitoring for the rapid detection of viable microorganisms in blood culture vials. A methodology was developed to detect pressure variation in intra-vials through a manometric instrument that was coupled to vials of blood culture containing culture broth that allowed microbial growth. This device allowed the early detection of microbial activity based on the production or use of intra-flask gases as a result of microbial metabolic activity. The analyzed variables were the pressure as a function of time, microbial species, and culture medium. The highest pressure found in the flasks without microorganisms was 40 mmHg between 2 and 6 h, and the lowest pressure was −42 mmHg between 21 and 24 h. The variation of the internal pressure in blood culture flasks according to different groups of microorganisms as a function of time demonstrated that the fermentative gram-negative bacilli and gram-positive cocci exhibited a significant increase in relation to their respective control groups (p < 0.001). The non-fermenting gram-negative bacilli showed expected results in relation to the pressure variation in which the production of negative pressures was noticed during the period of analysis, with a significant difference with respect to their control groups (p < 0.001). The developed methodology for the early detection of microorganisms responsible for bloodstream infection was demonstrated to be effective.

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Section: Definition Of the Maximum And Minimum Pressure For The Detection Time Of Microbial Activitymentioning

confidence: 99%

Development of a Manometric Monitoring Method for Early Detection of Air Microbiological Contamination in the Bloodstream

Neto

Pinheiro

Santos³

et al. 2021

Atmosphere

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“…Dentre os diversos objetos de estudo da disciplina de Física no ensino médio, destaca-se -usualmente na segunda série -o estudo da termologia. Os conceitos de temperatura e calor, dilatação térmica, gases ideais, termodinâmica, entre outros, são tratados a partir de modelos simples que, no entanto, são sustentação para aqueles que optam pela área tecnológica, dada a vasta aplicabilidade de tais conceitos [7]. Além de sua importância como base para o ensino superior, tais conteúdos são recorrentes nos exames -ENEM e vestibulares -para ingresso no ensino superior.…”

Section: Introductionunclassified

Proposta experimental para análise das variáveis de estado dos gases com Arduino

Cardoso

Zannin

2019

Rev. Bras. Ensino Fís.

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Resumo Por se tratar de uma ciência amplamente aplicada nos ramos tecnológicos, é essencial que a física seja ensinada a partir de demonstrações dos fenômenos e com relações entre teoria e prática. No entanto, por diversos motivos, os professores optam por aulas puramente expositivas. De maneira geral, verifica-se que, dessa forma, os alunos não se interessam pela disciplina e absorvem o conhecimento de forma mecânica. O presente estudo objetivou a construção de um produto educacional de baixo custo, utilizando a plataforma Arduino, para demonstrar a relação entre as variáveis de estado de um gás ideal em aulas do Ensino Médio. Os resultados demonstraram que, mesmo com materiais simples, é possível a construção de um aparato experimental capaz de extrair dados quantitativos e sua utilização em aula pode contribuir na construção do conhecimento de forma potencialmente significativa.

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A importância da lei de Gay-Lussac para a classificação dos compostos orgânicos

Cited by 2 publications

References 1 publication

Development of a Manometric Monitoring Method for Early Detection of Air Microbiological Contamination in the Bloodstream

Development of a Manometric Monitoring Method for Early Detection of Air Microbiological Contamination in the Bloodstream

Proposta experimental para análise das variáveis de estado dos gases com Arduino

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