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Related Concept Videos

Urea Cycle01:23

Urea Cycle

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.
2° Amines to N-Nitrosamines: Reaction with NaNO201:20

2° Amines to N-Nitrosamines: Reaction with NaNO2

Secondary amines react with nitrous acid to form N-nitrosamines, as depicted in Figure 1. Nitrous acid, a weak and unstable acid, is formed in situ from an aqueous solution of sodium nitrite and strong acids, such as hydrochloric acid or sulfuric acid, in cold conditions. In the presence of an acid, the nitrous acid gets protonated. The subsequent loss of water results in the formation of the electrophile known as nitrosonium ion.
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.
Comparative Excretory Systems02:24

Comparative Excretory Systems

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.
Preparation of Amines: Alkylation of Ammonia and Amines01:30

Preparation of Amines: Alkylation of Ammonia and Amines

Alkylation is one of the methods used to prepare amines. Direct alkylation of ammonia or a primary amine with an alkyl halide gives polyalkylated amines along with a quaternary ammonium salt through successive SN2 reactions. This process of making the quaternary salt through the direct alkylation method is called exhaustive alkylation.
Each alkylation step makes the nitrogen center more nucleophilic, which triggers successive alkylations until a quaternary ammonium salt is formed. Considering...
Drug Toxicity: Allergic Reactions01:30

Drug Toxicity: Allergic Reactions

Drug-related allergies are immune-mediated responses triggered by the administration of pharmacological agents. These hypersensitivity reactions are classified based on the immune mechanisms involved. The four primary types—Type I, II, III, and IV—are mediated by different immunological pathways and exhibit distinct clinical manifestations.Type I Hypersensitivity/ IgE-Mediated Reactions: Immunoglobulin E (IgE) immediately mediates Type I hypersensitivity reactions. Upon initial exposure to a...

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Related Experiment Video

Updated: Jun 20, 2026

An All-Human Hepatic Culture System for Drug Development Applications
07:23

An All-Human Hepatic Culture System for Drug Development Applications

Published on: October 20, 2023

Acute exposure to urea.

Jacek Sein Anand1, Piotr Kabata

  • 1Pomerania Center of Toxicology, Gdańsk, Poland. jsanand@amg.gda.pl

Przeglad Lekarski
|October 1, 2009
PubMed
Summary
This summary is machine-generated.

Massive exposure to urea, commonly considered non-toxic, can lead to chronic respiratory issues. This case highlights potential dangers of acute carbamide inhalation and skin contact.

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Area of Science:

  • Occupational Health
  • Toxicology
  • Pulmonology

Background:

  • Urea (carbamide) is widely used and generally considered non-toxic.
  • Limited data exists on the health effects of massive acute urea exposure.

Observation:

  • A 34-year-old male experienced a massive acute exposure to granulated urea after falling into a train car.
  • The patient was fully immersed in urea for approximately 10 minutes.

Findings:

  • The patient developed obturative respiratory insufficiency.
  • These respiratory symptoms persisted one year post-exposure, indicating a chronic condition.

Implications:

  • Massive urea exposure can pose significant respiratory health risks.
  • This case underscores the need for safety protocols in environments with high urea concentrations.