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Induced-fit Model01:13

Induced-fit Model

Most chemical reactions in cells require enzymes—biological catalysts that speed up the reaction without being consumed or permanently changed. They reduce the activation energy needed to convert the reactants into products. Enzymes are proteins, that usually work by binding to a substrate—a reactant molecule that they act upon.
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修改NIOSH的人形适应评估方法,使其与人类受试者适应测试相匹配.

Ali Hasani1, Joseph Dawson1, Magdalene Fogarasi1

  • 1Division of Applied Mechanics, Office of Science and Engineering Laboratories (OSEL), U.S. Food and Drug Administration (FDA).

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概括

经过修改的模型适合测试方法更好地模仿真实世界N95呼吸器在去污染后的性能. 这种改进的方法建议将重复使用限制在五个dons,并支持微波蒸汽用于去污染.

关键词:
在 COVID-19 疫情中,N95型呼吸器的使用情况清除污染的方法适合因素是适合因素.适应性测试 适应性测试曼尼克曼尼克曼尼克曼尼克

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科学领域:

  • 职业安全与健康问题 职业安全与健康问题
  • 生物医学工程 生物医学工程
  • 呼吸系统保护 呼吸系统保护

背景情况:

  • 美国国家职业安全与健康研究所 (NIOSH) 开发了一种人形适应性测试,作为对呼吸器适应性测试的资源高效替代品.
  • 在COVID-19大流行期间,在使用人类受试者进行脱污循环后,模型测试结果和现实世界N95呼吸器性能之间出现了差异.
  • 现有的模型测试方法可能不能准确地反映在现实使用条件下N95呼吸器的降解和适应因子的变化.

研究的目的:

  • 修改NIOSH人形适应测试方法,以更好地模拟现实世界N95呼吸器性能.
  • 为了评估长时间的磨损,重复的穿着/脱落,以及各种消毒方法对呼吸器适应因子的影响,使用修改的玩具测试.
  • 提供数据驱动的洞察力,以优化N95呼吸器在流行病情景中的再利用策略.

主要方法:

  • 这项研究涉及修改现有的NIOSH人形适应测试协议.
  • 经过修改的方法被用于评估N95呼吸器适应因子,模拟长期磨损,重复穿戴/脱落,并通过自闭包和微波生成蒸汽进行净化.
  • 呼吸模拟包括高流量 (85和70L/分钟) 和恒定和周期性流量模式,与成年人体受试者数据相比.

主要成果:

  • 经过修改的模型适应测试显示,与模拟重呼吸率的人体相比,对整体适应因子的预测过度 (7%和14%) 是微不足道的.
  • 恒流呼吸模拟给出了与循环流相似的结果,简化了测试程序.
  • 该研究表明,N95呼吸器的重复使用应限制在一次工作轮班内最多5次.

结论:

  • 修改后的模型适应测试方法提供了更现实的N95呼吸器性能评估,特别是在除污染和重复使用后.
  • 微波产生的蒸汽似乎是一个更合适的消毒方法,而不是单一的消毒周期的自动,保持呼吸器适合.
  • 这些发现支持对N95呼吸器重复使用的修订指南,强调对穿戴频率的限制,并建议针对未来公共卫生紧急情况使用特定的脱污技术.