Related Experiment Video
Updated: Jul 23, 2026
12:29
Upright Imaging of Drosophila Egg Chambers
Published on: March 13, 2015
8.3K
Light and life in Baltimore--and beyond
1Biology Department, Johns Hopkins University, Baltimore, Maryland.
Biophysical Journal
|February 5, 2015
Summary
This study details how photobleaching techniques, initially used for rhodopsin diffusion, now widely measure membrane protein and lipid movement, and cellular interactions.
Area of Science:
- Biophysics
- Cell Biology
- Microscopy
Background:
- Baltimore is a hub for biophysical cell studies.
- Quantitative measurement of rhodopsin lateral diffusion using photobleaching set a benchmark.
- The technique evolved from specialized microscopes to commercial scanning confocal microscopes.
Observation:
- Photobleaching recovery is a standard method for measuring lateral diffusion.
- This technique is now broadly applied to membrane proteins and lipids.
- It also assesses diffusion and binding in cellular components like organelles and cytoplasm.
Findings:
- The development of photobleaching recovery has enabled widespread quantitative measurement of molecular diffusion.
- The method is versatile, applicable to various cellular components and molecular interactions.
- Fluorescence resonance energy transfer (FRET) is utilized to image molecular proximity.
Implications:
- Advanced microscopy techniques facilitate detailed analysis of cellular dynamics.
- Understanding molecular diffusion and interactions is crucial for cell biology.
- Photobleaching-based methods offer robust tools for molecular proximity imaging.
Related Concept Videos
01:35Light as Energy
The energy required to carry out photosynthesis is light— typically electromagnetic radiation from the sun. The range of all possible wavelengths is known as the electromagnetic spectrum.
Photons
A photon is a discrete electromagnetic particle or bundle of energy. Photons are characterized by their frequency, wavelength, and amplitude, similar to the properties of a wave. Waves with higher frequencies transmit more energy and have shorter wavelengths than longer wavelengths that transmit less...
Photons
A photon is a discrete electromagnetic particle or bundle of energy. Photons are characterized by their frequency, wavelength, and amplitude, similar to the properties of a wave. Waves with higher frequencies transmit more energy and have shorter wavelengths than longer wavelengths that transmit less...
02:16Light Acquisition
In order to produce glucose, plants need to capture sufficient light energy. Many modern plants have evolved leaves specialized for light acquisition. Leaves can be only millimeters in width or tens of meters wide, depending on the environment. Due to competition for sunlight, evolution has driven the evolution of increasingly larger leaves and taller plants, to avoid shading by their neighbors with contaminant elaboration of root architecture and mechanisms to transport water and nutrients.
02:12The Wave Nature of Light
The nature of light has been a subject of inquiry since antiquity. In the seventeenth century, Isaac Newton performed experiments with lenses and prisms and was able to demonstrate that white light consists of the individual colors of the rainbow combined together. Newton explained his optics findings in terms of a "corpuscular" view of light, in which light was composed of streams of extremely tiny particles traveling at high speeds according to Newton's laws of motion.
01:23Photoluminescence: Fluorescence and Phosphorescence
Photoluminescence is a process where a molecule absorbs light energy and re-emits it in the form of light. This phenomenon occurs when a substance absorbs photons, promoting its electrons to higher energy level excited states, followed by a relaxation process in which the electrons return to their original ground state energy levels and emit light. Photoluminescence is widely observed in various materials, including semiconductors, and organic and inorganic compounds.
A pair of electrons in a...
A pair of electrons in a...
01:14Photoluminescence: Applications
Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
01:26Oxygenic Photosynthesis
Oxygenic photosynthesis is a fundamental process in which light energy is harnessed to drive the oxidation of water, leading to the production of molecular oxygen (O₂), adenosine triphosphate (ATP), and nicotinamide adenine dinucleotide phosphate (NADPH). This process is essential for sustaining aerobic life on Earth and is primarily carried out by cyanobacteria, algae, and plants. The core of oxygenic photosynthesis lies in the thylakoid membranes, where chlorophyll pigments facilitate light...