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Absorption Spectrum

The spectrum of electromagnetic radiation that has passed through a medium that absorbed radiation of certain wavelengths.The spectrum used to measure absorption where various wavelengths of light represent different colours of light.absorption spectrum

(Science: chemistry) a graph of the amount of light a substance absorbs, plotted as a fuction of energy, frequency or wavelength.


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Why does chlorophyll always fluoresce in red?

... fluorescence is always on the long-wavelength side of the lowest energy absorption band, in the red or infrared region of the spectrum. The fluorescent properties of a particular chlorophyll are functions of the structure ...

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by tyra99
Mon Aug 01, 2011 9:13 am
 
Forum: Botany Discussion
Topic: Why does chlorophyll always fluoresce in red?
Replies: 6
Views: 11103

Photosynthetic Pigments: The effect from coloured lighting

... other than chlorophyll a? (assuming that the colour wasnt in the absorption spectrum of chlorophyll a 2. Would i be able to measure this increase using chromatography? ...

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by biologyeeisuckx
Mon Jan 24, 2011 11:31 am
 
Forum: Botany Discussion
Topic: Photosynthetic Pigments: The effect from coloured lighting
Replies: 2
Views: 2863

UltraBright UV transilluminator

If you look at EtBr's excitation and emission spectrum, it is found the absorption is strongest near 300 nm. It is why most people use 302 nm UV to illuminate EtBr and cut ...

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by swing0916
Fri Oct 22, 2010 2:28 pm
 
Forum: Molecular Biology
Topic: UltraBright UV transilluminator
Replies: 17
Views: 14795

Re: measurement of photosynthesis rate +-red filter in elodea

... filter does(it's basically a red plastic). I am assuming that it blocks absorption of all red wavelengths and therefore reduces photosynthetic rate. ... confirm my assumption? I don't even know if Elodea absorbs in the red spectrum but the articles I see online seem to confirm that it does. We ...

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by robsabba
Mon Apr 05, 2010 4:32 pm
 
Forum: Botany Discussion
Topic: measurement of photosynthesis rate +-red filter in elodea
Replies: 3
Views: 6349

measurement of photosynthesis rate +-red filter in elodea

As you can see here , the chlorophylls have two absorpsion maxima, in the red and blue parts, so if the light has to go through red filter, basically the red light is not available. The Elodea is whole in water, right? You need some CO2 for the photosynthesis, that's way you have sodium bicarbonate ...

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by JackBean
Fri Mar 19, 2010 6:53 am
 
Forum: Botany Discussion
Topic: measurement of photosynthesis rate +-red filter in elodea
Replies: 3
Views: 6349
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