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Fatigue

Fatigue

Fatigue occurs when materials rupture under repeated or fluctuating loads, even at stress levels far below their static breaking strength. It typically results in brittle failure, even for ductile materials. It is a critical consideration in designing machines and structural components subjected to repetitive or varying loads. The nature of these loadings can range from fluctuating loads like unbalanced pump impellers causing vibrations to repeatedly bending a thin steel rod wire back and forth...

Mechanical Protein Functions

Mechanical Protein Functions

Proteins perform many mechanical functions in a cell. These proteins can be classified into two general categories- proteins that generate mechanical forces and proteins that are subjected to mechanical forces. Proteins providing mechanical support to the structure of the cell, such as keratin, are subjected to mechanical force, whereas proteins involved in cell movement and transport of molecules across cell membranes, such as an ion pump, are examples of generating mechanical force.

Muscle Recovery and Fatigue

Muscle Recovery and Fatigue

Muscle fatigue refers to the decline in a muscle's ability to maintain the force of contraction after prolonged activity. It primarily stems from changes within muscle fibers. Even before experiencing muscle fatigue, one may feel tired and have the urge to stop the activity. This response, known as central fatigue, occurs due to changes in the central nervous system, namely the brain and spinal cord. While there is no single mechanism that induces fatigue, it may serve as a protective response...

ATP Synthase: Mechanism

ATP Synthase: Mechanism

In animals, the mitochondrial F1F0 ATP synthase is the key protein that synthesizes ATP molecules through a complex catalytic mechanism. While the nuclear genome encodes the majority of ATP synthase subunits, the mitochondrial genome encodes some of the enzyme's most critical components. The formation of this multi-subunit enzyme is a complex multi-step process regulated at the level of transcription, translation, and assembly. Defects in one or more of these steps can result in decreased ATP...

Energy to Drive Translocation

Energy to Drive Translocation

Mitochondrial protein import is powered by two distinct energy sources: ATP hydrolysis and electrochemical potential across the inner membrane. Newly synthesized precursors are bound by cytosolic chaperones of the Hsp70 family, which guide them to the import receptors on the mitochondrial surface. Utilizing the energy of ATP hydrolysis, Hsp70 chaperones transfer these precursors to the TOM receptors on the mitochondrial outer membrane.
Generally, polypeptides are unfolded by two distinct...

ATP Driven Pumps I: An Overview

ATP Driven Pumps I: An Overview

ATP-driven pumps, also known as transport ATPases, are integral membrane proteins. They have binding sites for ATP located on the membrane's cytosolic side and the ion-conducting domain in the transmembrane region. These pumps use the free energy released from ATP hydrolysis to move the solutes across cell membranes against an electrochemical gradient.
There are four main types of ATP-driven pumps - P-type, V-type, F-type, and ABC transporter. All these pumps are of varying complexities and are...

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Related Experiment Video

Updated: Jun 2, 2026

The Treadmill Fatigue Test: A Simple, High-throughput Assay of Fatigue-like Behavior for the Mouse

The Treadmill Fatigue Test: A Simple, High-throughput Assay of Fatigue-like Behavior for the Mouse

Published on: May 31, 2016

Fatigue failure and molecular machine design.

Henry Hess¹, Emmanuel L P Dumont

¹Department of Biomedical Engineering, Columbia University, 1210 Amsterdam Ave., New York, NY 10027, USA. hh2374@columbia.edu

Small (Weinheim an Der Bergstrasse, Germany)

|May 17, 2011

Summary

This summary is machine-generated.

Understanding molecular machine longevity is key. Reducing mechanical load and using rebinding bonds can dramatically extend molecular machine lifetime, crucial for sustained operation.

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Area of Science:

Molecular Engineering
Nanotechnology
Biophysics

Background:

Sophisticated molecular machines exist in nature and are being synthesized.
Sustaining operation over many cycles is a critical challenge.
Bond fatigue, not just rupture, may limit molecular machine performance.

Purpose of the Study:

To investigate the impact of cyclic stresses on molecular machine lifetime.
To explore design strategies for enhancing the durability of molecular machines.
To estimate the design space for molecular machines using scaling laws.

Main Methods:

Analysis of cyclic stress effects on single and double bonds.
Modeling the relationship between mechanical load and bond lifetime.
Extrapolation of macroscale motor scaling laws to the molecular scale.

Main Results:

Bond fatigue under repeated stress limits mechanical performance.
Increased molecular machine lifetime requires reduced mechanical load.
Polyvalent bonds capable of rebinding significantly extend bond lifetime.

Conclusions:

Molecular machine design must balance performance with lifetime.
Strategies like rebinding bonds are essential for durable molecular machines.
Scaling laws provide a framework for designing robust molecular machines.