The seasonal photosynthetic responses of seedlings of the endangered plant Cathaya argyrophylla to different growth light environments.Biodiversity Science, 13, 387-397. Zhang WF, Fan DY, Xie ZQ, Jiang XH (2005). Editorial: Unraveling the molecular dynamics of thylakoids under light stress.Plant and Cell Physiology, 55, 1203-1205. Green light drives leaf photosynthesis more efficiently than red light in strong white light: Revisiting the enigmatic question of why leaves are green.Plant and Cell Physiology, 50, 684-697. Terashima I, Fujita T, Inoue T, Chow WS, Oguchi R (2009). Phytochrome photosensory signalling networks.Nature Reviews Molecular Cell Biology, 3, 85-93. Lambers H, Chapin FS III, Pons TL (2008). Evidence for the role of the oxygen-evolving manganese complex in photoinhibition of photosystem II.Biochimica et Biophysica Acta, 1706, 68-80. Hakala M, Touminen I, Keränen M, Tyystjärvi T, Tyystjärvi E (2005). In conclusion, this method has potential applications for the study of plant physiology and ecology. With this new approach, the application of portable spectrometer can be greatly broadened: 1) the light intensity and quality of light source and plant growth light environment can be obtained simultaneously, 2) PPFD can be obtained within any specified wavelength range, and 3) there is no need to use standard light source to obtain the absolute light/radiation flux of a spectrum measured by spectrometer. Under natural light conditions, the errors between measured and calculated PPFDs are in the range from -2% to 5%, indicating the reliability of the method. Chemistry: An Introduction to General, Organic, and Biological Chemistry. After calibration of the spectrometer, we can calculate photosynthetic photon flux density ( PPFD or PAR) and measure spectrum of radiation flux simultaneously. How do you calculate relative intensity in XRD To calculate relative intensity, divide the absolute intensity of every peak by the absolute intensity of the most intense peak, and then convert to a percentage. Under the guide of the formula, a portable spectrometer (AvaSpec-ULS2048×64) was calibrated by using four narrowband light emitting diode (LEDs) in combination with a calibrated quantum meter (LI-190SB). Thus the equation for relative intensities b in decibels may be written b 10 log10 (I/I0). Here we developed an empirical formula to convert light energy to photon flux density, based on the measurement conditions of spectrometer. However, the calibrated quantum meter for measurement of light intensity cannot measure light quality, and vice versa. The influence of light intensity and light quality on plants is highly concerned in the field of plant physiology and ecology.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |