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Chirality in Nature

Chirality in Nature

Chirality is the most intriguing yet essential facet of nature, governing life’s biochemical processes and precision. It can be observed from a snail shell pattern in a macroscopic world to an amino acid, the minutest building block of life. Most of the snails around the world have right-coiled shells because of the intrinsic chirality in their genes. All the amino acids present in the human body exist in an enantiomerically pure state, except for glycine - the sole achiral amino acid.

Chirality

Chirality

Chirality is a term that describes the lack of mirror symmetry in an object. In other words, chiral objects cannot be superposed on their mirror images. For example, our feet are chiral, as the mirror image of the left foot, the right foot, cannot be superposed on the left foot.
Chiral objects exhibit a sense of handedness when they interact with another chiral object. For example, our left foot can only fit in the left shoe and not in the right shoe. Achiral objects — objects that have...

Chirality at Nitrogen, Phosphorus, and Sulfur

Chirality at Nitrogen, Phosphorus, and Sulfur

Chirality is most prevalent in carbon-based tetrahedral compounds, but this important facet of molecular symmetry extends to sp3-hybridized nitrogen, phosphorus and sulfur centers, including trivalent molecules with lone pairs. Here, the lone pair behaves as a functional group in addition to the other three substituents to form an analogous tetrahedral center that can be chiral.
A consequence of chirality is the need for enantiomeric resolution. While this is theoretically possible for all...

Prochirality

Prochirality

The concept of prochirality leads to the nomenclature of the individual faces of a molecule and plays a crucial role in the enantioselective reaction. It is a concept where two or more achiral molecules react to produce chiral products. A typical process is the reaction of an achiral ketone to generate a chiral alcohol. Here, the achiral reactant reacts with an achiral reducing agent, sodium borohydride, to generate an equimolar mixture of the chiral enantiomers of the product. For example, an...

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Related Experiment Video

Updated: Feb 20, 2026

Preparation of Rat Tail Tendons for Biomechanical and Mechanobiological Studies

Preparation of Rat Tail Tendons for Biomechanical and Mechanobiological Studies

Published on: July 30, 2010

Chiral behavior in rat tail tendon fascicles.

Kimberly A Buchanan¹, Roderic S Lakes², Ray Vanderby³

¹Department of Biomedical Engineering, University of Wisconsin-Madison, Madison, WI 53706, USA; Department of Orthopedics and Rehabilitation, University of Wisconsin-Madison, Madison, WI 53705, USA.

Journal of Biomechanics

|October 21, 2017

Summary

Rat tail tendon fascicles exhibit significant axial twist when stretched, revealing their chiral nature and helical structure. This stretch-twist coupling is a key mechanical property not explained by classical theories.

Keywords:

Chirality Cosserat elasticity Fascicle Mechanics Tendon

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Last Updated: Feb 20, 2026

Preparation of Rat Tail Tendons for Biomechanical and Mechanobiological Studies

Preparation of Rat Tail Tendons for Biomechanical and Mechanobiological Studies

Published on: July 30, 2010

A Micropatterning Assay for Measuring Cell Chirality

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The Tail Suspension Test

The Tail Suspension Test

Published on: January 28, 2012

Area of Science:

Biomechanics
Materials Science
Tendon Research

Background:

Tendon mechanical behavior is typically studied under constrained uniaxial tensile testing.
Observed axial twist in rat tail tendon (RTT) fascicles during loading necessitates further investigation.
Classical elasticity models do not fully explain tendon's complex mechanical responses.

Purpose of the Study:

To quantify the unconstrained axial rotation of RTT fascicles during tensile loading.
To characterize stretch-twist coupling and rotational relaxation in RTT fascicles.
To explore the implications of observed mechanical behavior for tendon structure and elasticity theories.

Main Methods:

Developed a custom magnetic suspension testing setup for unconstrained axial rotation during tensile loading.
Characterized rotational behavior of single and paired RTT fascicles under cyclic loading.
Measured stress relaxation and rotational relaxation across loading cycles.

Main Results:

Single RTT fascicles exhibit significant nonlinear stretch-twist coupling (mean rotation ~51.1° at ~1% axial strain).
Paired RTT fascicles showed reduced rotation compared to single fascicles.
Specimen diameter influenced mechanical properties, notably the elastic modulus.
Observed axial load-induced twist demonstrates RTT fascicle chirality.

Conclusions:

RTT fascicles possess inherent chirality and a helical substructure, as evidenced by stretch-twist coupling.
Micropolar (Cosserat) elasticity better predicts these observed mechanical behaviors than classical elasticity.
The findings support a helical model of fascicle structure and warrant further investigation into its mechanical and biological consequences.