BIO1011 Lecture Notes - Lecture 5: Photosynthetically Active Radiation, Accessory Pigment, Chromatium
6 Aug 2018
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Bio1011 lecture 5 - energy transformation in cells, Use energy from oxidation of reduced forms of inorganic compounds such as h2s, nh4+ Water vapour in the atmosphere reduces infra-red component. Wavelengths ~ 300-(cid:1005)4(cid:1004)(cid:1004) (cid:374)(cid:373) reach the earth s surface. Photosynthetically active radiation = 400-700 nm. (used by plants) Light dependent reactions: the energy of sunlight is used to form nadph and atp. The calvin cycle: the energy from nadph and atp forms sugar from co2. i. e. assimilates co2(and inorganic n, s) into organic matter. Light is absorbed by specific pigments found within the thylakoid membranes of chloroplasts. Chloroplasts --> thylakoid membranes --> chlorophyll & accessory pigments. Chlorophyll is a photon trapping pigment that captures red light and blue light. Carotenoids (accessory pigments) trap blue-violet light and reflect orange, yellow or red light. Chlorophyll b and carotenoids are accessory pigments. A few minor others, e. g. purple = anthocyanins. Chlorophylls absorb well in the blue & red regions of the visible spectrum.
