Related Experiment Video
Updated: May 18, 2026
11:05
A Gradient-generating Microfluidic Device for Cell Biology
Published on: August 30, 2007
Generation of controllable gradients in cell density
Wenying Liu1, Yu Zhang, Stavros Thomopoulos
1School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, 30332, USA.
Angewandte Chemie (International Ed. in English)
|September 7, 2012
Summary
Scientists created a cell density gradient on a substrate by tilting it in a cell suspension. This method allows for controlled cell distribution and fabrication of reverse gradients for various applications.
Area of Science:
- Biomaterials Engineering
- Cell Biology
- Tissue Engineering
Background:
- Controlled cell distribution is crucial for tissue engineering and regenerative medicine.
- Fabricating precise cell density gradients presents a significant technical challenge.
Purpose of the Study:
- To develop a novel method for creating stable cell density gradients on substrates.
- To demonstrate the fabrication of both forward and reverse cell density gradients.
Main Methods:
- A substrate was tilted at a specific angle within a homogeneous cell suspension to induce sedimentation.
- The gradient was formed by exploiting the changing availability of cells for sedimentation across the tilted surface.
- Reverse gradients were achieved through multiple sedimentation steps.
Main Results:
- A reproducible gradient in cell density was successfully generated on the substrate.
- The method allowed for the creation of gradients with varying cell concentrations.
- Reverse gradients were fabricated on the same substrate, demonstrating versatility.
Conclusions:
- The described method offers a simple yet effective approach for generating cell density gradients.
- This technique has potential applications in tissue engineering, drug screening, and fundamental cell biology studies.
- The ability to create both forward and reverse gradients enhances its utility in diverse research areas.
Related Concept Videos
01:20Overview Of Cell Separation And Isolation
Cell separation was first achieved in 1964 by S. H. Seal, who separated large tumor cells from the smaller blood cells using filtration. Two years later, Pohl and Hawk performed experiments on how cells respond differently to a nonuniform electric field based on the cell type. Such observations were the inception of cell separation methods, which allow isolating a single cell type from a heterogeneous sample.
01:26What is an Electrochemical Gradient?
Adenosine triphosphate, or ATP, is considered the primary energy source in cells. However, energy can also be stored in the electrochemical gradient of an ion across the plasma membrane, which is determined by two factors: its chemical and electrical gradients.
The chemical gradient relies on differences in the abundance of a substance on the outside versus the inside of a cell and flows from areas of high to low ion concentration. In contrast, the electrical gradient revolves around an ion’s...
The chemical gradient relies on differences in the abundance of a substance on the outside versus the inside of a cell and flows from areas of high to low ion concentration. In contrast, the electrical gradient revolves around an ion’s...