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Related Concept Videos

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.
Toxicity falls into two primary categories: local and systemic.
Local toxicity appears at the exposure site, such as protein denaturation caused by caustic substances.
In contrast, systemic toxicity requires the toxic agent's absorption and distribution,...
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Drug Toxicity: Dose-Dependent Reactions01:24

Drug Toxicity: Dose-Dependent Reactions

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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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Toxicity Testing in Animals01:23

Toxicity Testing in Animals

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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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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.
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...
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Drug Toxicity: Overview01:00

Drug Toxicity: Overview

123
Drug toxicity quantifies the harm a compound causes to an organism, varying by dose and potentially impacting whole systems or specific organs like the liver. Toxic reactions may arise from venomous insect or spider bites, with effects ranging from mild symptoms to severe outcomes such as brain damage or death. Common forms of acute poisoning include ethanol intoxication and overdose of pain or fever medications, with substances like GHB and heroin being particularly lethal at doses close to...
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Toxicokinetics: Overview01:21

Toxicokinetics: Overview

125
Studies that assess how a drug is absorbed, distributed, metabolized, and excreted (ADME) at toxic doses are termed toxicokinetics. Understanding toxicokinetics helps predict adverse drug reactions (ADRs) and manage toxicity in humans.Toxicokinetics differs from pharmacokinetics mainly in the dose levels studied, with toxicokinetics focusing on higher toxic doses. The kinetics at these levels can be non-linear due to altered physiological processes. Toxicodynamics examines the relationship...
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Toxicity Study of Zinc Oxide Nanoparticles in Cell Culture and in Drosophila melanogaster
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Nanoparticles: Is Toxicity a Concern?

Ramakrishna D1, Pragna Rao2

  • 1Department of Biochemistry, Kamineni Institute of Medical Sciences , Sreepuram, Narketpally, Nalgonda-508 254.

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Summary
This summary is machine-generated.

Nanotechnology offers medical advances, but nanoparticle toxicity is a concern. This review identifies safe nanoparticle types, sizes, and concentrations for human health applications.

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Area of Science:

  • Nanotechnology and Materials Science
  • Biomedical Engineering
  • Toxicology

Background:

  • Nanotechnology, manipulating matter at the nanoscale, has advanced medicine, environment, and biotechnology.
  • Unique nanomaterial properties (chemical, optical, magnetic) drive commercial and medical applications.
  • Nanoparticles show promise for disease treatment and in vitro diagnostics.

Purpose of the Study:

  • To review the safety of nanoparticles concerning human health.
  • To identify safe nanoparticle types, sizes, and concentrations for various applications.
  • To guide the development of diagnostic, prognostic, and therapeutic models using nanoparticles.

Main Methods:

  • Literature review on nanotechnology applications and safety.
  • Analysis of nanoparticle properties and biological interactions.
  • Evaluation of existing data on nanoparticle toxicity and safe usage levels.

Main Results:

  • Nanomaterials possess unique properties enabling diverse applications.
  • Nanoparticles can breach biological barriers, accessing cells and organs.
  • Potential for genotoxicity and biochemical toxicity exists, necessitating safety assessments.

Conclusions:

  • Understanding nanoparticle toxicity is crucial for the health industry.
  • Establishing safe usage parameters is essential for harnessing nanotechnology's medical potential.
  • This review aims to provide guidelines for safe nanoparticle integration into healthcare.