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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.

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...

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...

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)

Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...

NMR Spectroscopy: Spin–Spin Coupling

NMR Spectroscopy: Spin–Spin Coupling

The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved...

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...

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Related Experiment Video

Updated: Dec 25, 2025

A Micropatterning Assay for Measuring Cell Chirality

A Micropatterning Assay for Measuring Cell Chirality

Published on: March 11, 2022

Probing Primordial Chirality with Galaxy Spins.

Hao-Ran Yu^1,2,3, Pavel Motloch², Ue-Li Pen^2,3,4,5,6

¹Department of Astronomy, Xiamen University, Xiamen, Fujian 361005, China.

Physical Review Letters

|March 29, 2020

Summary

Primordial chiral violation may be detected by measuring galaxy spins. This study proposes a new method using large-scale structure to find fossil chiral imprints from the early Universe, testing chiral symmetry breaking.

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Last Updated: Dec 25, 2025

A Micropatterning Assay for Measuring Cell Chirality

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Area of Science:

Cosmology
Particle Physics
Astrophysics

Background:

Chiral symmetry is maximally violated in weak interactions.
Microscopic asymmetries in the early Universe may leave observable astrophysical imprints.
The cosmological principle states the Universe is homogeneous and isotropic.

Purpose of the Study:

To propose a helicity measurement to detect primordial chiral violation.
To identify halo-galaxy angular momentum directions (spins) as a fossil chiral observable.
To provide a direct test of chiral symmetry breaking in the early Universe.

Main Methods:

Constructing a spin mode in Lagrangian space from the large-scale structure clustering mode.
Using simulations to demonstrate the spin mode as a probe of halo-galaxy spins.
Analyzing correlations between helical components of the spin mode and galaxy spins.

Main Results:

Halo-galaxy spins, frozen during galaxy formation, serve as a fossil chiral observable.
The constructed spin mode is shown to be a good probe of halo-galaxy spins in simulations.
A strong symmetric correlation is expected between helical spin mode components and galaxy spins in the standard model.

Conclusions:

Measurements of these correlations can detect chiral breaking.
This method offers a direct test for chiral symmetry breaking in the early Universe.
The proposed helicity measurement provides a novel approach to probe fundamental physics in cosmology.