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Polymers

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The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...

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Among the three main modes of HGT—transformation, conjugation, and transduction—transduction is unique in that it is mediated by bacteriophages, or bacterial viruses.Transduction occurs in two ways. Generalized transduction occurs during the lytic cycle of a bacteriophage infection. In this process, bacteriophages infect bacterial cells, replicate within them, and ultimately cause cell lysis, releasing newly assembled virions. Occasionally, random fragments of the bacterial genome...

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Related Experiment Video

Updated: Feb 10, 2026

Transduction of Human Cells with Polymer-complexed Ecotropic Lentivirus for Enhanced Biosafety

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Published on: July 24, 2011

Mechanical transduction via a single soft polymer.

Ruizheng Hou¹, Nan Wang², Weizhu Bao^2,3

¹School of Science and Institute of Quantum Optics and Quantum Information, Xi'an Jiaotong University, Shaan Xi 710049, China.

Physical Review. E

|May 16, 2018

Summary

This summary is machine-generated.

Soft polymers, even with minimal rigidity, effectively perform mechanical work and displacement. This "soft" approach offers advantages over rigid structures in molecular machines and motors.

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Area of Science:

Polymer physics
Nanotechnology
Biophysics

Background:

Molecular machines utilize soft structures for mechanical functions, but mechanisms remain unclear.
Understanding soft vs. rigid structures in mechanical transduction is crucial for molecular devices.

Purpose of the Study:

To rigorously study mechanical transduction in a single soft polymer.
To explore the advantages of soft polymers over rigid structures in molecular machines.

Main Methods:

Exact solutions to the three-dimensional wormlike-chain model.
Analytical relations derived from simpler polymer models.

Main Results:

Soft polymers with vanishingly small persistence length can transduce significant biased displacement and mechanical work.
The "soft" approach demonstrates unique advantages over rigidity-based transduction.

Conclusions:

Soft polymers offer a unified mechanism for allostery-like transduction and relay in molecular devices.
An entropy limit for soft transduction suggests potential for higher motor efficiency detection.