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相关概念视频

Types of Toxins01:36

Types of Toxins

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Humans continually engage with an environment rich in potentially harmful chemicals. These are introduced to our bodies through inhalation, ingestion, or skin contact. These chemicals exist in various forms, such as air and environmental pollutants, agricultural chemicals, organic solvents, and heavy metals.
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Mutagenicity and carcinogenicity refer to the ability of drugs to cause genetic defects and induce cancer, respectively. The International Agency for Research on Cancer (IARC) classifies agents into four groups based on their carcinogenic potential. Group 1 agents are known human carcinogens; group 2A agents are probably carcinogenic to humans; group 3 agents lack data to support their role in carcinogenesis; and group 4 includes agents for which data support that they are not likely to be...
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When toxic substances penetrate the human body, they disseminate to various tissues, undergoing metabolic changes. This process yields reactive metabolites that may covalently bind with specific target molecules, resulting in toxicity.
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The oxidation of an organic compound in the presence of air or oxygen is called autoxidation. For example, cumene reacts with oxygen to form hydroperoxide. Autoxidation involves initiation, propagation, and termination steps. Many organic compounds are susceptible to autoxidation—especially ethers in the presence of oxygen, which form hydroperoxides. Even though this reaction is slow, old ether bottles contain small amounts of peroxide, which leads to laboratory explosions during ether...
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Drugs, encompassing various chemical compounds from natural sources, lab synthesis, or genetic engineering, elicit different biological responses in living organisms. Some of these responses are desirable or therapeutic, while others are undesirable. The primary goal of administering a drug is to achieve a therapeutic effect, that is, to address a specific disease or health condition. Any concurrent effects outside of this therapeutic outcome are considered undesirable. These undesirable...
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反应性有机化合物的演变及其在野火中的潜在健康风险 烟雾

Havala O T Pye1, Lu Xu2, Barron H Henderson3

  • 1Office of Research and Development, US Environmental Protection Agency, Durham, North Carolina 27711, United States.

Environmental science & technology
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概括

野火烟雾含有大量的活性有机化合物 (ROC). 目前的排放清单低估了ROC质量,影响了对森林火灾烟雾的健康风险评估.

关键词:
空气质量空气质量空气质量危险的空气污染物 危险的空气污染物有机气溶有机气溶有机反应化合物 有机反应化合物烟雾的烟雾,烟雾的烟雾.挥发性有机化合物 挥发性有机化合物森林大火 野火 森林大火

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科学领域:

  • 环境科学 环境科学
  • 大气化学 大气化学
  • 公共卫生 公共卫生

背景情况:

  • 野火是越来越多的空气污染源,对健康有重大影响.
  • 野火烟雾的组成,特别是活性有机化合物 (ROC),影响健康影响.
  • 准确估计排放量对于了解烟雾影响至关重要.

研究的目的:

  • 为了估计美国西部野生林地森林火灾中的活性有机化合物 (ROC).
  • 为了将排放库存估计与观测和建模数据进行比较.
  • 评估ROC对与野火烟雾相关的健康风险的贡献.

主要方法:

  • 利用了2019年"火灾对区域至全球环境和空气质量影响" (FIREX-AQ) 现场活动的数据.
  • 采用了社区多层次空气质量 (CMAQ) 模型进行预测.
  • 分析了气相和颗粒物种的丰度,无论是以摩尔单位还是以质量为基础的单位.

主要成果:

  • 标准排放库存仅捕获估计ROC质量的40-45%,主要有机气溶明显低估 (5-8倍).
  • 气相物种的丰富性向下风向下显示了碎片化产品的产生,如甲和甲醇.
  • 火灾排放量估计为每公斤CO的1250±60gC的ROC,这表明ROC的碳排放量很大.
  • 颗粒ROC可能主导吸入烟雾的长期癌症和非癌症健康风险.

结论:

  • 现有的野火烟雾排放库存不足,特别是对于ROC.
  • 了解颗粒ROC的质量和成分对于准确的健康风险评估至关重要.
  • 需要对来自森林火灾的颗粒ROC的毒性进行进一步的研究,以充分评估对健康的影响.