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Related Concept Videos

Olfaction01:25

Olfaction

47.8K
The sense of smell is achieved through the activities of the olfactory system. It starts when an airborne odorant enters the nasal cavity and reaches olfactory epithelium (OE). The OE is protected by a thin layer of mucus, which also serves the purpose of dissolving more complex compounds into simpler chemical odorants. The size of the OE and the density of sensory neurons varies among species; in humans, the OE is only about 9-10 cm2.
The olfactory receptors are embedded in the cilia of the...
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Physiology of Smell and Olfactory Pathway01:20

Physiology of Smell and Olfactory Pathway

11.9K
Humans detect odors with the help of specialized cells located in the upper part of the nasal cavity, called olfactory receptor neurons (ORNs). ORNs possess hair-like structures called cilia, which are receptive to sensations from the inhaled air. When an odorant molecule binds to a specific receptor on the cell of the cilia, it leads to a series of events that ultimately cause the ORN to send electrical signals to the olfactory bulb in the brain through the olfactory nerves.
The olfactory...
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Related Experiment Video

Updated: Dec 23, 2025

Real-time In Vitro Monitoring of Odorant Receptor Activation by an Odorant in the Vapor Phase
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Real-time In Vitro Monitoring of Odorant Receptor Activation by an Odorant in the Vapor Phase

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Decoding the social volatilome by tracking rapid context-dependent odour change.

S Craig Roberts1, Pawel K Misztal2,3, Ben Langford3

  • 1Division of Psychology, Faculty of Natural Sciences, University of Stirling, Stirling FK9 4LA, UK.

Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
|April 21, 2020
PubMed
Summary

New analytical methods can identify chemical signals in human body odor, revealing how social context changes scent. This research advances understanding of olfactory communication and its applications.

Keywords:
chemosignalodourolfactionpheromonesmellvolatilome

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Area of Science:

  • Analytical Chemistry
  • Olfactory Communication
  • Human Behavior

Background:

  • Human body odor plays a role in social interactions.
  • The chemical basis of social cues in body odor and the impact of social context remain largely uncharacterized.
  • Traditional methods for analyzing body odor are time-consuming and lack real-time capabilities.

Purpose of the Study:

  • To introduce advanced analytical techniques for real-time characterization of human body odor.
  • To explore how social context influences the chemical composition of body odor.
  • To identify specific chemical compounds (chemosignals) involved in human olfactory communication.

Main Methods:

  • Utilized online chemical ionization time-of-flight mass spectrometry for sensitive, real-time measurement of hundreds of gas-phase volatile organic compounds.
  • Analyzed ambient air from individuals and groups to capture instantaneous odor changes.
  • Applied multivariate statistical approaches, such as positive matrix factorization, to analyze complex data and identify functional chemosignals.

Main Results:

  • Demonstrated the capability of online chemical ionization time-of-flight mass spectrometry to continuously monitor volatile organic compounds in real-time.
  • Showcased the potential of multivariate statistics to identify patterns and linked compounds indicative of chemosignals.
  • Established a novel approach for studying dynamic changes in body odor chemistry influenced by social context.

Conclusions:

  • Emerging analytical techniques offer powerful new tools for investigating human olfactory communication.
  • These methods provide a more sensitive and dynamic approach compared to traditional gas chromatography.
  • The findings open new avenues for research in human and animal olfactory communication, biometrics, and disease diagnostics.