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相关概念视频

Physical and Chemical Properties of Matter02:57

Physical and Chemical Properties of Matter

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The characteristics that enable us to distinguish one substance from another are called properties.
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Chemical Formulas02:52

Chemical Formulas

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A chemical formula presents information about the proportions of atoms constituting a particular chemical compound or molecule, mainly using symbols of elements and numbers. At times other symbols, such as dashes, parentheses, brackets, commas, plus, and minus signs, are also used. A chemical formula can be one of three types – molecular, empirical, and structural.
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Chemical Equations03:10

Chemical Equations

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Chemical equations represent the identities and relative quantities of substances involved in a chemical reaction. The substances undergoing reaction are called reactants, and their formulas are placed on the left side of the equation. The substances generated by the reaction are called products, and their formulas are placed on the right side of the equation. Plus signs (+) separate individual reactant and product formulas, and an arrow (→) separates the reactant and product (left and right)...
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Chemical Reactions01:19

Chemical Reactions

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A chemical reaction is a process by which the bonds in the atoms of substances are rearranged to generate new substances. Matter cannot be created or destroyed in a chemical reaction—the same type and number of atoms that make up the reactants are still present in the products. Merely, the rearrangement of chemical bonds produces new compounds.
Chemical Reactions Rearrange Atoms into New Substances
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Toxic Reactions: Overview01:26

Toxic Reactions: Overview

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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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Types of Chemical Bonds02:37

Types of Chemical Bonds

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Chemical bonding theories were pioneered by American chemist Gilbert N. Lewis. He developed a model called the Lewis model to explain the type and formation of different bonds. Chemical bonding is central to chemistry; it explains how atoms or ions bond together to form molecules. It explains why some bonds are strong and others are weak, or why one carbon bonds with two oxygens and not three; why water is H2O and not H4O. 
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Updated: Jan 23, 2026

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ToxFCDB:永远化学品的毒性数据库

Meetali Sinha1,2, Deepak Kumar Sachan1,2, Joy Chakraborty1

  • 1Computational Toxicology Group, Regulatory, GLP Compliant Studies, and Computational Toxicology (REACT), CSIR- Indian Institute of Toxicology Research, Vishvigyan Bhavan, 31, Mahatma Gandhi Marg, Lucknow 226001, Uttar Pradesh, India.

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概括

一个新的数据库,ToxFCDB,提供了超过8000个per-和多甲基物质 (PFAS) 的毒性数据. 该资源有助于评估数据差的PFAS的风险,支持公共卫生和环境保护.

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科学领域:

  • 环境化学环境化学
  • 毒理学 毒理学 毒理学
  • 计算化学计算化学

背景情况:

  • 和多基基物质 (PFAS) 是具有广泛应用的持久性合成化学物质.
  • 对于许多PFAS化合物存在有限的毒性数据,对人类健康和环境构成风险.
  • 现有的研究主要集中在经过深入研究的PFAS上,但对其他许多 PFAS 存在数据缺口.

研究的目的:

  • 开发一个全面的基于网络的数据库 (ToxFCDB) 用于PFAS的初步毒性评估.
  • 为进一步的毒理学研究优先考虑数据较差的PFAS化合物.
  • 提供可访问的,以数据为中心的信息,以提供知情决策.

主要方法:

  • 建立一个基于网络的数据库,汇编8204 PFAS.
  • 使用超过50个定量结构-活动关系 (QSAR) 模型和数据库进行in silico评估.
  • 编制的数据包括分子结构,特性,毒理学数据和人类目标.

主要成果:

  • 毒素FCDB包含8204种PFAS化合物的详细信息.
  • 包括分子结构,物理化学和毒动力学特性,QSAR预测和毒理学数据.
  • 识别与PFAS相关的化学基因和人类点.

结论:

  • ToxFCDB是工业界人士,政策制定者和研究人员的宝贵资源.
  • 促进风险评估和有关PFAS的知情决策.
  • 鼓励进一步的毒理学研究和更安全的化学品和聚合物的重新设计.