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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...

Properties of Enantiomers and Optical Activity

Properties of Enantiomers and Optical Activity

It is essential to understand the difference between chiral and achiral interactions and the implications thereof in optical activity and their applications. Just as our feet, which are chiral, interact uniquely with chiral objects, such as a pair of shoes, but identically with achiral socks, enantiomers of a molecule exhibit different properties only when they interact with other chiral media. An example of a significant implication from this facet is the phenomenon known as optical activity,...

Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration

Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration

The rate of acid-catalyzed hydration of alkenes depends on the alkene's structure, as the presence of alkyl substituents at the double bond can significantly influence the rate.

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...

Noncovalent Attractions in Biomolecules

Noncovalent Attractions in Biomolecules

Noncovalent attractions are associations within and between molecules that influence the shape and structural stability of complexes. These interactions differ from covalent bonding in that they do not involve sharing of electrons.
Four types of noncovalent interactions are hydrogen bonds, van der Waals forces, ionic bonds, and hydrophobic interactions.
Hydrogen bonding results from the electrostatic attraction of a hydrogen atom covalently bonded to a strong-electronegative atom like oxygen,...

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Related Experiment Video

Updated: Sep 9, 2025

Interfacial Molecular-level Structures of Polymers and Biomacromolecules Revealed via Sum Frequency Generation Vibrational Spectroscopy

Interfacial Molecular-level Structures of Polymers and Biomacromolecules Revealed via Sum Frequency Generation Vibrational Spectroscopy

Published on: August 13, 2019

Optimal Chirality Enhances Long-Range Fluctuation-Induced Interactions in Active Fluids.

Hashem Fatemi¹, Hamidreza Khalilian¹, Jalal Sarabadani¹

¹School of Quantum Physics and Matter, Institute for Research in Fundamental Sciences (IPM), Tehran, 19538-33511, Iran.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)

|September 3, 2025

Summary

This summary is machine-generated.

Chiral active matter self-organizes through particle interactions. Chirality

Keywords:

chiral active matter collective behavior fluctuation‐induced interactions geometry‐induced optimization structure formation

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Published on: August 13, 2019

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Area of Science:

Soft Matter Physics
Active Matter
Chirality Studies

Background:

Understanding chiral active matter self-organization is key.
Fluctuation-induced forces drive structure formation in active systems.
The role of chirality in these forces is under-explored.

Purpose of the Study:

Investigate effective fluctuation-induced forces between intruders in chiral active fluids.
Determine how particle shape influences chiral interactions.
Map force regimes across chirality, propulsion, and intruder separation.

Main Methods:

Theoretical investigation of effective fluctuation-induced forces.
Analysis of intruder-fluid interactions in chiral active systems.
Mapping of force regimes based on particle properties and separation.

Main Results:

Chirality's impact on interactions is shape-dependent.
For circular particles, increased rotation-to-propulsion ratio suppresses interaction.
Rodlike particles exhibit spontaneous vortex formation around intruders at an optimal chiral angle.

Conclusions:

Chiral active matter interactions are tunable by particle shape and chirality.
Vortex formation in rodlike particle systems offers novel self-assembly principles.
Findings provide insights for designing and controlling active self-assembled systems.