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Related Concept Videos

Urea Cycle01:23

Urea Cycle

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The urea cycle describes how liver cells convert ammonia to urea. Ammonia is a toxic waste product of protein catabolism. Land animals must convert ammonia into the less toxic urea which can be safely eliminated by the kidneys through urine. Marine animals excrete ammonia directly, and the surrounding water dilutes the ammonia to safe levels.
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Enhanced Elimination of Poison01:26

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Poison can be effectively removed from the gastrointestinal (GI) tract through various decontamination procedures.
Antidotes serve a crucial role in counteracting the effects of poison by inhibiting enzymes responsible for producing harmful drug metabolites. In some cases, these toxic metabolites can be neutralized by endogenous cosubstrates, which are maintained at specific concentrations to prevent interaction with cellular macromolecules and subsequent cell death.
Renal excretion is the...
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In cases of acute poisoning, the primary objective is to prevent further absorption of the toxic substance into the body. Immediate interventions using various decontamination techniques targeting the gastrointestinal (GI) tract can achieve this. Decontamination is crucial to prevent poison from entering the systemic circulation, which involves washing affected areas with water and mild soap and removing contaminated clothing. Once external decontamination is done, attention must be turned to...
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Comparative Excretory Systems02:24

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Animals have evolved different strategies for excretion, the removal of waste from the body. Most waste must be dissolved in water to be excreted, so an animal’s excretory strategy directly affects its water balance.
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Hepatic Encephalopathy01:29

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DefinitionHepatic encephalopathy is a reversible neurologic syndrome that results from advanced liver dysfunction or portosystemic shunting. It leads to disturbances in cognition, behavior, and motor function due to the brain’s exposure to gut-derived toxins that the liver fails to detoxify.EtiologyThis condition develops either in the setting of acute fulminant hepatitis or progressively during chronic liver disease, such as cirrhosis and portal hypertension. Portosystemic...
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Anticholinesterase Agents: Poisoning and Treatment01:26

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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.     
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Related Experiment Video

Updated: Apr 18, 2026

Ammonia Fiber Expansion AFEX Pretreatment of Lignocellulosic Biomass
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Ammonia Fiber Expansion AFEX Pretreatment of Lignocellulosic Biomass

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Overcoming ammonium toxicity.

András Bittsánszky1, Katalin Pilinszky1, Gábor Gyulai2

  • 1Plant Protection Institute, Centre for Agricultural Research, Hungarian Academy of Sciences, Herman Otto 15, 1022 Budapest, Hungary.

Plant Science : an International Journal of Experimental Plant Biology
|January 11, 2015
PubMed
Summary

Ammonia is vital for plant amino acid synthesis but toxic when accumulated. This study reveals numerous unstudied reactions impacting plant ammonium levels, highlighting the need for further research into ammonia metabolism and toxicity management.

Keywords:
AmmoniaAmmoniumCellular responsesPhytotoxicitySelective ammonia uptake, transport and detoxification

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Area of Science:

  • Plant Physiology
  • Biochemistry
  • Molecular Biology

Background:

  • Ammonia (ammonium ion) is essential for amino acid biosynthesis.
  • Ammonia accumulation causes cellular damage, necessitating tight regulation of its fluxes.
  • Existing knowledge implicates only a few enzymes and transporters in maintaining ammonium homeostasis.

Purpose of the Study:

  • To comprehensively analyze biochemical reactions, enzymes, and transporters involved in plant ammonium metabolism.
  • To identify previously underappreciated pathways influencing cellular ammonium concentrations.
  • To highlight areas for future research in managing ammonium toxicity.

Main Methods:

  • Systematic review of scientific literature.
  • Analysis of publicly available data from plant metabolic and genetic databases (Plant Metabolic Network, TAIR, Genevestigator).
  • Compilation of data on endogenous ammonium production/consumption reactions, catalyzing enzymes, and relevant mutants.

Main Results:

  • A surprisingly large number of understudied reactions significantly influence cellular ammonium concentrations.
  • Identified numerous enzymes and transporters potentially involved in ammonium homeostasis.
  • Highlighted gaps in understanding ammonium's role in apoptosis and oxidative stress.

Conclusions:

  • Plant ammonium metabolism is more complex than previously thought, involving numerous under-researched reactions.
  • Further investigation into ammonium's role in stress responses and apoptosis is crucial.
  • Understanding these pathways is key to developing strategies for managing ammonium toxicity in plants.