Sentences with phrase «of a specific wavelength by»

Electrons within atoms absorb light of a specific wavelength by jumping from one energy level to a higher one.

Not exact matches

The laser generates a specific wavelength of light that is absorbed in a stoichiometric fashion by glucose molecules — the more glucose molecules; the more photons are absorbed.

Photodynamic therapy (PDT), involves the use of chemicals called photosensitizers that are activated by exposure to specific wavelengths of light to release reactive molecules that can damage nearby cells.

These filters block out light pollution and the moon's glow, if present, by allowing only specific wavelengths of light to reach the camera sensor.

Various elements emit light at specific EUV and X-ray wavelengths depending on their temperature, so by observing in several different wavelengths, a picture of the complete temperature structure of the corona can be made.

(1) Like other molecules, QD emit a wavelength of light in specific response to excitation by a different wavelength, but the light they emit depends on their size.

Irreversible PA - FPs can be switched on from a state of dim or no fluorescence, to a brighter fluorescent state by exposure to a specific wavelength of light.

That first quasar and others identified later puzzled astronomers because, when their light was analyzed to find the characteristic «signature» of emission at specific wavelengths shown by particular atoms, the pattern was at first indecipherable.

Light at certain specific wavelengths can be produced by gas molecules in these galaxies, and the wavelengths are stretched by the expansion of the Universe over the billions of years that it takes the light to reach us.

The simplest and the most popular one is the sensitised emission method, where the donor is excited by a specific wavelength of light and the signal is collected by using emission filters chosen for the donor fluorescence and the acceptor fluorescence.

Several very recent studies, most notably research from a team headed by Dr. George Brainard at Thomas Jefferson Medical College in Philadelphia, have identified the specific wavelengths of blue light, 446 - 477 nm that are crucial in suppressing melatonin production in humans.

The drug within the tumor is activated by a specific wavelength of light to generate intracellular oxygen and lead to death of cells and / or loss of blood supply.

When a photon is absorbed through any such transition, the molecule is then in an excited state, Depending on the specific energy levels, the molecule may partly or wholly de-excite by emission of photons of longer wavelength (to be absorbed in turn by other molecules).

The water molecule has a permanent dipole moment which gives it a rotational mode that has an effect on most of the IR spectrum radiated by the Earth as well as vibrational modes that only operate on specific wavelengths.

It is true that adding more of the greenhouse gas affected by the specific wavelength (s) of IRR will cause more warming but that increase in warming diminishes exponentially which renders any increase from additional gas insignificant.

-- the atmospheric concentration of CO2 and other GHG's; — the reflective & absorptive characteristics, as a function of wavelength, for the GHG's; — the specific heat and mass of the earth's intermediate - term heat - storage media — the oceans (primarily) and the atmosphere; — the quantity of heat absorbed by phase - changes = ice - melt; and by chemical / biological processes.

A team led by Pratul Agarwal of the Department of Energy's Oak Ridge National Laboratory (ORNL) has used light of specific wavelengths to modify the enzyme Candida antarctica lipase B (CALB) to promote catalysis.

Greenhouse Gas (GHG)- Geenhouse gases are those gaseous constituents of the atmosphere, both natural and anthropogenic, that absorb and emit radiation at specific wavelengths within the spectrum of thermal infrared radiation emitted by the Earth's surface, the atmosphere itself, and by clouds.

:) A «radiance» is a «comparison'to an accepted «standard radiance» (don't ask me what frequencies this involves, as that's defined by «the standard»), but an «intensity» is an «absolute measure» of «energy» (don't ask me how the «Planck constant» is considered there) and seems to be commonly used with a specific spectral wavelength.