|
|
The Interaction of Light with Biological Molecules:
Introduction for the Interaction of Light with Biological Molecules
|
 |
John Markwell
Department of Agronomy and Horticulture at University of Nebraska-Lincoln, USA
Deana Namuth
Department of Agronomy and Horticulture at University of Nebraska-Lincoln, USA
 Lesson Navigation Tips:
- Click on 'Animations' button found to the left in order to view the animation which supplements this lesson. You can also click on the animation icon within the text.
- Click once on figures to see enlarged versions.
- Click once on words in color to bring up their definitions.
|
Overview
This lesson describes the nature of light, the energy within photons and how this energy may be transferred to biological molecules. In addition, the beneficial and harmful methods for de-exciting molecules will be described.
Objectives
At the completion of this lesson, students will be able to:- Describe the nature of photons as quanta or packets of energy
- Predict the relative energy in a photon from its wavelength
- Describe the absorption process in terms of electronic state transitions
- Describe four different pathways for de-excitation:
- Fluorescence or thermal decay
- Transfer of energy
- Triple state conversion
- Photochemistry
- Differentiate between singlet and triplet electronic states
- Understand photosensitization in terms of free radical generation of reactive oxygen
Development of this lesson was supported in part by Cooperative State Research, Education, & Extension Service, U.S. Dept of Agriculture under Agreement Number 98-EATP-1-0403 administered by Cornell University and the American Distance Education Consortium (ADEC).
Any opinions, findings, conclusions or recommendations expressed in this publication are those of the author(s) and do not necessarily reflect the view of the U.S. Department of Agriculture. This manuscript has been assigned Journal Series NO. 03-8, College of Agricultural Sciences and natural Resources, University of Nebraska.
|
