Related Experiment Video
Updated: Aug 11, 2026

09:20
The Assembly and Application of 'Shear Rings': A Novel Endothelial Model for Orbital, Unidirectional and Periodic Fluid Flow and Shear Stress
Published on: October 31, 2016
Tube-shaking attachment for rotary shakers
1U.S. Environmental Protection Agency, National Environmental Research Center, Cincinnati, Ohio 45268.
Applied Microbiology
|April 1, 1973
Summary
A new, affordable tube-shaking device was created for rotary shakers. It easily attaches without disrupting existing flask holders, enhancing laboratory efficiency.
Area of Science:
- Laboratory equipment development
- Biotechnology tools
Background:
- Rotary shakers are common laboratory equipment.
- Existing shaker accessories can be cumbersome or interfere with other equipment.
Purpose of the Study:
- To develop an inexpensive and compatible tube-shaking device.
- To improve the functionality of rotary shakers.
Main Methods:
- Design and fabrication of a novel tube-shaking attachment.
- Testing the attachment's compatibility with standard rotary shakers and flask holders.
Main Results:
- The developed device is inexpensive to produce.
- The tube-shaking device attaches securely without interfering with flask holders.
- It effectively shakes tubes when attached to a rotary shaker.
Conclusions:
- The new device offers a cost-effective solution for tube shaking on rotary shakers.
- It enhances laboratory workflow by providing a non-interfering shaking accessory.
Related Concept Videos
Torsional Pendulum
A torsional pendulum involves the oscillation of a rigid body in which the restoring force is provided by the torsion in the string from which the rigid body is suspended. Ideally, the string should be massless; practically, its mass is much smaller than the rigid body's mass and is neglected.
As long as the rigid body's angular displacement is small, its oscillation can be modeled as a linear angular oscillation. The amplitude of the oscillation is an angle. The role of mass is played by the...
As long as the rigid body's angular displacement is small, its oscillation can be modeled as a linear angular oscillation. The amplitude of the oscillation is an angle. The role of mass is played by the...
Physical Pendulum
When a rigid body is hanging freely from a fixed pivot point and is displaced, it oscillates similar to a simple pendulum and is known as a physical pendulum. The period and angular frequency of a physical pendulum are obtained by using the small-angle approximation and drawing parallels with a spring-mass system. The small-angle approximation (sinθ=θ) is valid up to about 14°.
When dealing with complicated systems, the mass moment of inertia is an important parameter, as it describes the mass...
When dealing with complicated systems, the mass moment of inertia is an important parameter, as it describes the mass...
Deformation in a Circular Shaft
One of the distinctive characteristics of circular shafts is their ability to maintain their cross-sectional integrity under torsion. In other words, each cross-section continues to exist as a flat, unaltered entity, simply rotating like a solid, rigid slab. To understand the distribution of shearing stress within such a shaft, consider a cylindrical section inside this circular shaft. This section has a length of L and a radius of R, with one end fixed. The radius of the cylindrical section is...
Circular Shaft - Stresses in Linear Range
Consider a scenario where a circular shaft is subject to torque that remains within the boundaries of Hooke's Law, avoiding any permanent deformation. So, the formula for shearing strain is revisited. This formula is multiplied by the modulus of rigidity, and then Hooke's Law for the shearing stress and strain is applied. As a result, the equation for shearing stress in a shaft can be derived.
Stress Concentrations in Circular Shafts
Consider the elastic torsion formula, which applies to a circular shaft with a consistent cross-section. This formula assumes that the shaft's ends are loaded with rigid plates firmly attached. However, in many cases, torques are applied to the shaft through mechanisms like flange couplings or gears, which are connected by keys inserted into keyways. This application method modifies the stress distribution near the point of torque application, causing it to deviate from the distributions...
Vibrating Concrete
Mechanical vibrators are instrumental in compacting newly poured concrete within formwork and around reinforcements. This process is essential to eliminate trapped air pockets and establish a dense concrete mass. One widely used method is vibrating by internal vibrators, often referred to as a poker vibrator or immersion vibrator. It is rapidly inserted through the full depth of the freshly laid concrete and slightly extends into the layer below it (which remains in a plastic state). Consistent...

