翻訳と辞書 Words near each other ・ Photosonic ・ Photosphere ・ Photostat machine ・ Photostationary state ・ Photostimulated luminescence ・ Photostimulation ・ Photostomias ・ Photostylus pycnopterus ・ Photoswitch ・ Photosynth ・ Photosynthate partitioning ・ Photosynthesis ・ Photosynthesis system ・ Photosynthetic (album) ・ Photosynthetic capacity ・ Photosynthetic efficiency ・ Photosynthetic picoplankton ・ Photosynthetic pigment ・ Photosynthetic reaction centre ・ Photosynthetic reaction centre protein family ・ Photosynthetic state transition ・ Photosynthetically active radiation ・ Photosystem ・ Photosystem I ・ Photosystem II ・ Photosystem II light-harvesting protein ・ Phototaxis ・ Phototendering ・ Phototheca ・ Phototherapeutic keratectomy Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Photosynthetic efficiency ： ウィキペディア英語版 Photosynthetic efficiency The photosynthetic efficiency is the fraction of light energy converted into chemical energy during photosynthesis in plants and algae. Photosynthesis can be described by the simplified chemical reaction :6H2O + 6CO2 + energy → C6H12O6 + 6O2 where C6H12O6 is glucose (which is subsequently transformed into other sugars, cellulose, lignin, and so forth). The value of the photosynthetic efficiency is dependent on how light energy is defined – it depends on whether we count only the light that is absorbed, and on what kind of light is used (see Photosynthetically active radiation). It takes eight (or perhaps 10 or more〔(Renewable biological systems for unsustainable energy production ). FAO Agricultural Services Bulletins (1997).〕) photons to utilize one molecule of CO2. The Gibbs free energy for converting a mole of CO2 to glucose is 114 kcal, whereas eight moles of photons of wavelength 600 nm contains 381 kcal, giving a nominal efficiency of 30%. However, photosynthesis can occur with light up to wavelength 720 nm so long as there is also light at wavelengths below 680 nm to keep Photosystem II operating (see Chlorophyll). Using longer wavelengths means less light energy is needed for the same number of photons and therefore for the same amount of photosynthesis. For actual sunlight, where only 45% of the light is in the photosynthetically active wavelength range, the theoretical maximum efficiency of solar energy conversion is approximately 11%. In actuality, however, plants do not absorb all incoming sunlight (due to reflection, respiration requirements of photosynthesis and the need for optimal solar radiation levels) and do not convert all harvested energy into biomass, which results in an overall photosynthetic efficiency of 3 to 6% of total solar radiation.〔 If photosynthesis is inefficient, excess light energy must be dissipated to avoid damaging the photosynthetic apparatus. Energy can be dissipated as heat (non-photochemical quenching), or emitted as chlorophyll fluorescence. == Typical efficiencies == 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Photosynthetic efficiency」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.