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Related Concept Videos

The Periodic Table and Organismal Elements00:57

The Periodic Table and Organismal Elements

OverviewElements are the smallest units of matter that cannot be broken down further by chemical processes. There are 118 known elements, but not all of these are naturally-occurring, and fewer still are essential for life. Living matter is composed primarily of carbon, nitrogen, hydrogen, and oxygen, with smaller amounts of other elements like calcium, phosphorus, potassium, and sulfur. Other elements are also necessary for life but only in trace amounts.The Periodic Table Provides Information...
The Periodic Table and Organismal Elements01:27

The Periodic Table and Organismal Elements

Elements are the smallest units of matter that cannot be broken down further by chemical processes. There are 118 known elements, but not all of these are naturally occurring, and only a few of them are essential for life. Living matter is composed primarily of carbon, nitrogen, hydrogen, and oxygen, with smaller amounts of other elements like calcium, phosphorus, potassium, and sulfur. Other elements are also necessary for life but only in trace amounts.
Periodic Table Provides Information...
Types of Toxins01:36

Types of Toxins

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.
Air pollutants, primarily gases, pose significant threats to respiratory health, leading to conditions like hypoxia, lung cancer, and in extreme cases, death.
Environmental pollutants like...
Acid Mine Drainage01:19

Acid Mine Drainage

Mining activities that disturb sulfide-rich rocks, particularly those containing pyrite (FeS₂), initiate a cascade of geochemical and microbiological processes with serious environmental implications. When exposed to air and water, pyrite undergoes oxidation, releasing sulfate, ultimately forming sulfuric acid and mobilizing heavy metals into surrounding water systems. This phenomenon, known as acid mine drainage (AMD), results in low pH waters laden with toxic elements that threaten aquatic...
Toxic Reactions: Overview01:26

Toxic Reactions: Overview

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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Drug Toxicity: Dose-Dependent Reactions01:24

Drug Toxicity: Dose-Dependent Reactions

Drug toxicities can be stratified into pharmacological, pathological, or genotoxic based on their mechanisms. The incidence and severity of these toxicities generally increase with the drug's concentration in the body and exposure time.Pharmacological toxicity is evident when the therapeutic effects of drugs overshoot into adverse reactions in a predictable, dose-dependent manner. Central nervous system (CNS) depression from barbiturates is a classic example, with effects escalating from...

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Related Experiment Video

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Rearing the Cabbage White Butterfly (Pieris rapae) in Controlled Conditions: A Case Study with Heavy Metal Tolerance
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Heavy metal toxicity and the environment.

Paul B Tchounwou1, Clement G Yedjou, Anita K Patlolla

  • 1NIH-RCMI Center for Environmental Health, College of Science, Engineering and Technology, Jackson State University, 1400 Lynch Street, 18750, Jackson, MS, 39217, USA, paul.b.tchounwou@jsums.edu.

Experientia Supplementum (2012)
|September 5, 2012
PubMed
Summary

Heavy metals like arsenic, cadmium, chromium, lead, and mercury are toxic environmental contaminants. This review analyzes their occurrence, exposure risks, and molecular mechanisms of toxicity and carcinogenicity.

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Area of Science:

  • Environmental Science
  • Toxicology
  • Public Health

Background:

  • Heavy metals are naturally occurring elements with high atomic weight and density.
  • Industrial, domestic, agricultural, and technological uses lead to widespread environmental distribution.
  • Toxicity is influenced by dose, exposure route, chemical species, and individual factors.

Purpose of the Study:

  • To analyze the environmental occurrence, production, and use of priority heavy metals.
  • To investigate the potential for human exposure to these toxic elements.
  • To elucidate the molecular mechanisms underlying their toxicity, genotoxicity, and carcinogenicity.

Main Methods:

  • Literature review of environmental occurrence.
  • Analysis of industrial and domestic applications.
  • Examination of toxicological and epidemiological studies.

Main Results:

  • Arsenic, cadmium, chromium, lead, and mercury are priority metals due to high toxicity and public health significance.
  • These metals are systemic toxicants causing multi-organ damage and are classified as human carcinogens.
  • Widespread environmental distribution raises significant human health concerns.

Conclusions:

  • Understanding heavy metal environmental fate and exposure pathways is crucial.
  • Molecular mechanisms of toxicity, genotoxicity, and carcinogenicity require further investigation.
  • Effective risk assessment and management strategies are needed to mitigate adverse health effects.