PHOTOPHORESIS Meaning and
Definition
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Photophoresis is a physical process involving the movement of particles or organisms under the influence of light. It is characterized by the transfer of momentum from photons to particles, leading to their migration or accumulation in different regions.
In scientific terms, photophoresis is typically observed in colloidal and biological systems, where particles or cells are suspended in a fluid medium. When exposed to intense light, the particles experience a force known as photophoretic force, which causes them to move in the direction of light or towards regions of higher or lower light intensity. This movement occurs due to the thermal heating effect caused by light absorption on the particles' surfaces, leading to pressure differences and creating an overall net force on them.
The phenomenon of photophoresis has been extensively studied in various fields, including physics, chemistry, and engineering. It has applications in particle manipulation, optofluidics, and biological systems. For example, in microfluidic devices, photophoresis can be employed to sort or separate particles based on their physical properties or response to light.
Furthermore, in biological systems, photophoresis plays a crucial role in the movement and distribution of photosynthetic cells or organisms, aiding their survival and growth. It can also assist in the study of cellular behavior and interactions under controlled light conditions.
Overall, photophoresis encompasses the phenomena associated with the light-induced movement of particles or organisms, offering a valuable tool for various scientific and technological applications.
Etymology of PHOTOPHORESIS
The word "photophoresis" is derived from two Greek roots: "photo" and "phoresis".
1. "Photo" (φωτός) comes from the Greek word "phos" (φῶς) which means "light".
2. "Phoresis" (φορήσις) is derived from the Greek word "phorein" (φορεῖν) which means "to carry" or "to bear".
Therefore, when combined, "photophoresis" can be understood as the process of carrying or moving substances under the influence of light.
