Excitation Power Density
Excitation Power Density - Related Videos
12:33
Corticospinal Excitability Modulation During Action Observation
0 Views •
Cited by 22 •
2013
Single-pulse transcranial magnetic stimulation over the primary motor cortex, neuronavigation, and registration of electromyographic activity of hand muscles were used in this study to explore corticospinal excitability while participants were observing action sequences.
12:13
Assessing Primary Motor Cortex Excitability and Excitability Modulation by Pairing Transcranial Magnetic Stimulation with Electromyography
0 Views •
2025
Here, we present a protocol outlining the methodology to assess primary motor cortex excitability and excitability modulation using transcranial magnetic stimulation (TMS) paired with electromyography (EMG).
01:08
Power
0 Views •
2023
The concept of work involves force and displacement; meanwhile, the work-energy theorem relates the net work done on a body to the difference in its kinetic energy, calculated between two points on its trajectory. While none of these quantities or relations involves time explicitly, we know that the time available to accomplish work is often just as important as the amount of work itself. For example, sprinters in a race may have achieved the same velocity at the finish, therefore,...
10:22
Demonstration of the Power Law Model Through Extrusion
0 Views •
2023
Source: Kerry M. Dooley and Michael G. Benton, Department of Chemical Engineering, Louisiana State University, Baton Rouge, LA Polymer melts are often formed into simple shapes or "extrudates", such as cylindrical pellets, flat sheets, or pipe, using an extruder.1 Polyolefins are among the most common extrudable polymers. Extrusion involves transporting and melting solid feed, which is sometimes mixed with non-polymeric materials, and the pressure build-up and transport of the melt or mixture.
07:04
A Step Beyond BRET: Fluorescence by Unbound Excitation from Luminescence (FUEL)
0 Views •
Cited by 2 •
2014
Expanding the foundation and applicability of Fluorescence by Unbound Excitation from Luminescence (FUEL) by surveying the relevant principles and demonstrating its compatibility with a multitude of fluorophores and antibody-targeted conditions.
FAQs
Changing this parameter changes the photon flux reaching the specimen. A higher value can increase fluorophore excitation in fluorescence experiments or strengthen activation of a photosensitive system. The resulting signal or biological response therefore depends not only on the sample, but also on the optical exposure delivered to it, making power density a central variable when comparing conditions.
Increasing illumination can improve detection or activation only up to the point where unwanted effects become important. Excessive exposure may promote photobleaching, which reduces fluorophore performance, and can also cause heating or cellular stress. Selecting a suitable level therefore requires balancing response strength against preservation of the sample.
The target system determines what an increase in optical exposure means. For a fluorophore, greater excitation can raise the fluorescence-related signal, whereas a photosensitive biological or material system may show stronger activation. This distinction matters because power density must be interpreted alongside the response being measured, not treated as a universal indicator of one outcome.
Control begins by measuring the optical power density delivered to the sample. Researchers can then adjust the level for the intended light-dependent response and keep it consistent across experimental conditions. This approach supports reproducible fluorescence imaging and more meaningful comparisons between biological samples, because differences in exposure do not obscure differences in sample behavior.
Fluorescence imaging uses it to tune excitation while seeking a detectable signal, and light-activated biomaterials use it to control activation of photosensitive components. In both cases, the parameter links optical exposure to the desired bioengineering function. Measuring and adjusting it helps investigators compare platforms or samples while limiting effects from excessive exposure.
Reporting the applied value gives context for interpreting signal strength or activation. It helps distinguish a change caused by the biological sample from a change caused by different optical exposure. That record also supports quantitative comparisons, reproducible experiments, and evaluation of whether stronger responses were achieved at the cost of photobleaching, heating, or cellular stress.