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Related Concept Videos

Anticholinesterase Agents: Poisoning and Treatment01:26

Anticholinesterase Agents: Poisoning and Treatment

Anticholinesterases, also known as cholinesterase inhibitors, work by blocking the breakdown of acetylcholine, leading to its accumulation in the synaptic cleft. This accumulation indirectly enhances both muscarinic and nicotinic actions. These agents are classified as reversible or irreversible based on their mechanism of action.     
Irreversible agents form a strong bond with the cholinesterase enzyme, making it inactive. The breakdown of the phosphorylated enzyme is slower than the...
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...
Antidotes01:17

Antidotes

Antidotes are medicinal substances used to counteract the harmful effects of toxins or drugs in the body. They function in various ways, each uniquely designed to combat specific toxic compounds.
Specific antidotes operate by inhibiting the enzymes that control biochemical pathways, reducing the production of harmful metabolites.
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Physical Properties of Amines01:26

Physical Properties of Amines

Amines with low molecular weight are usually gaseous at room temperature, while those with high molecular weight are liquid or solids in nature. Usually, low molecular weight amines have a rotten fish-like smell. Diamines typically have a pungent smell. For instance, cadaverine and putrescine, depicted in Figure 1, are two molecules responsible for decaying tissue.
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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Toxicity Testing in Animals

Toxicity tests in animals are grounded on two main assumptions: first, the effects observed in laboratory animals can be extrapolated to humans, especially when adjusted for body surface area; second, high-dose exposure in animals is essential to identify potential human hazards from lower doses. This is based on the quantal dose-response concept, which faces the challenge of extrapolating results from relatively few test animals to much larger human populations. For example, a 0.01% incidence...

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Related Experiment Video

Updated: Jul 9, 2026

Assessment of Chemical Toxicity in Adult Drosophila Melanogaster
07:02

Assessment of Chemical Toxicity in Adult Drosophila Melanogaster

Published on: March 24, 2023

Arsenic entomotoxicology.

Carlos Alberto Rebolloso-Hernández1, Israel Razo-Soto2, Iram Pablo Rodríguez-Sánchez3

  • 1Coordinación para la Innovación y Aplicación de la Ciencia y la Tecnología, Universidad Autónoma de San Luis Potosí, San Luis Potosí, SLP, Mexico. carlos.rebolloso.ambientales@gmail.com.

Environmental Geochemistry and Health
|July 7, 2026
PubMed
Summary

Arsenic poses a significant threat to insects, impacting their health and ecosystems. This review proposes guidelines for arsenic in soil and water to protect insect populations from this overlooked pollutant.

Keywords:
Arsenic biogeochemistryInsectsToxicityToxicokinetic

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Area of Science:

  • Environmental Toxicology
  • Entomology
  • Ecotoxicology

Background:

  • Chemical pollution, especially agrochemicals, endangers insects.
  • Risks from globally relevant pollutants like arsenic are understudied.
  • Arsenic exposure pathways and toxicological effects in insects require thorough investigation.

Purpose of the Study:

  • To review and characterize arsenic's risks to insects.
  • To assess the toxicological evidence of arsenic's impact on insect health.
  • To identify major sources of arsenic exposure for insects.

Main Methods:

  • Critical assessment of existing toxicological evidence on arsenic.
  • Review of arsenic accumulation, excretion, and biochemical effects in insects.
  • Analysis of arsenic's impact at organism, population, and community levels.

Main Results:

  • Arsenic exposure occurs via contaminated food, water, and soil.
  • Insects accumulate inorganic arsenic, primarily in the gut.
  • Arsenic induces oxidative stress, genotoxicity, deformities, developmental delays, and behavioral changes.
  • Proposed guidelines: 7.1 mg/kg for soil and 0.055 mg/L for water.

Conclusions:

  • Arsenic is a toxic contaminant with adverse effects on insects.
  • Insects play a role in arsenic transfer to predators and ecosystem dispersal.
  • Mining, industrial, and agricultural activities are key arsenic sources for insects.