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Related Concept Videos

Olfaction01:25

Olfaction

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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.
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Olfactory Receptors: Location and Structure01:03

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The process of olfaction, also known as the sense of smell, is a sophisticated chemical response system. The specialized sensory neurons that facilitate this process, known as olfactory receptor neurons, are situated in an upper segment of the nasal cavity, known as the olfactory epithelium. Olfactory sensory neurons are bipolar, with their dendrites extending from the epithelium's apex into the mucus that lines the nasal cavity. Airborne molecules, when inhaled, traverse the olfactory...
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Physiology of Smell and Olfactory Pathway01:20

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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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Hair Cells01:22

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Hair cells are the sensory receptors of the auditory system—they transduce mechanical sound waves into electrical energy that the nervous system can understand. Hair cells are located in the organ of Corti within the cochlea of the inner ear, between the basilar and tectorial membranes. The actual sensory receptors are called inner hair cells. The outer hair cells serve other functions, such as sound amplification in the cochlea, and are not discussed in detail here.
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Related Experiment Video

Updated: Sep 13, 2025

Whole Mount Labeling of Cilia in the Main Olfactory System of Mice
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Bionic helical sensor array inspired by mammal olfactory recess.

Zhiyuan Wu1, Fengchun Tian2, Yuzhu Nie1

  • 1School of Microelectronic and Communication Engineering, Chongqing University, 400044, Chongqing, China.

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Summary
This summary is machine-generated.

A novel helical sensor array for electronic noses (E-noses) mimics the mammalian olfactory system. This bio-inspired design improves odor concentration uniformity and enhances odor recognition accuracy compared to traditional planar arrays.

Keywords:
Electronic noseFlexible sensorMetal-organic framework (MOF)Olfactory recess

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Area of Science:

  • Bio-inspired engineering
  • Sensor technology
  • Chemical sensing

Background:

  • Sensor array spatial distribution significantly impacts electronic nose (E-nose) performance.
  • Mammalian olfactory systems offer a model for improved odor detection mechanisms.

Purpose of the Study:

  • To develop a flexible, bionic helical sensor array for enhanced E-nose performance.
  • To investigate the effect of a helical structure on odor concentration distribution and selectivity.
  • To compare the performance of the helical array against a planar design.

Main Methods:

  • Fabrication of a flexible sensor array with a bionic helical structure.
  • Integration of Metal-Organic Framework (MOF) materials and thermal modulation for differentiated odor selectivity.
  • Computational fluid dynamics (CFD) simulations to analyze odor concentration distribution.
  • Performance evaluation using 14 different odorants, assessing accuracy, sensitivity, specificity, AUC, and F1 score.

Main Results:

  • The bionic helical structure effectively mimics the olfactory recess's rectification effect, leading to more uniform odor concentration distribution.
  • The helical array demonstrated superior performance across all key metrics compared to the planar array.
  • Peak classification accuracy for the helical array reached 85.8 ± 4.7%, significantly higher than the planar array's 79.7 ± 6.5%.

Conclusions:

  • The bio-inspired helical sensor array design offers a promising strategy for improving E-nose performance.
  • This approach enhances odor recognition precision and selectivity.
  • The study highlights the potential of biomimicry in advancing sensor technologies for complex chemical sensing applications.