P700, or photosystem I primary donor, is the reaction-center chlorophyll a molecular dimer associated with photosystem I in plants, algae, and cyanobacteria. (wikipedia.org)
The reaction center chlorophyll (or the primary electron donor) of photosystem I that is most reactive and best in absorbing light at wavelength of 700 nm. (e-cyanobacterium.org)
Electrons5
This species is vital due to its ability to absorb light energy with a wavelength approximately between 430 nm-700 nm, and transfer high-energy electrons to a series of acceptors that are situated near it. (wikipedia.org)
The resulting P700 with an excited electron is designated as P700*, which is a strong reducing agent due to its very negative redox potential of -1.2 V. Following the excitation of P700, one of its electrons is passed on to an electron acceptor, Ao, triggering charge separation producing an anionic Ao− and cationic P700+. (wikipedia.org)
The rate of electrons being passed from P700* to the subsequent electron acceptors is high, preventing the electron from being transferred back to P700+. (wikipedia.org)
Consequently, in most cases, the electrons transferring within photosystem I follow a linear pathway, from the excitation of the P700 special pair to the production of NADPH. (wikipedia.org)
In certain situations, it is vital for the photosynthetic organism to recycle the electrons being transferred, resulting in the electron from the terminal iron-sulfur cluster FB transferring back to the cytochrome b6f complex (adaptor between photosystems II and I). Utilizing the energy of P700+, the cyclic pathway creates a proton gradient useful for the production of ATP, while no NADPH is produced, since the protein ferredoxin does not become reduced. (wikipedia.org)
Photosystem4
Photosystem I operates with the functions of producing NADPH, the reduced form of NADP+, at the end of the photosynthetic reaction through electron transfer, and of providing energy to a proton pump and eventually ATP, for instance in cyclic electron transport. (wikipedia.org)
When photosystem I absorbs light, an electron is excited to a higher energy level in the P700 chlorophyll. (wikipedia.org)
Photosystem I: The Light-Driven Plastocyanin:Ferredoxin Oxidoreductase. (wikipedia.org)
P700: the primary electron donor of photosystem I". Biochimica et Biophysica Acta (BBA) - Bioenergetics. (wikipedia.org)
Photosynthesis11
Complete the illustration of the overview of photosynthesis by writing the products and the reactants of the process, as well as the energy source that excites the electrons. (e-wit.pl)
Briefly describe the overall function of Photosystem II in the light-dependent reactions of photosynthesis. (e-wit.pl)
The light reaction is a process requiring the input of carbon dioxide, water and light, in order to produce the reactants required for the dark reaction, the second stage of photosynthesis. (e-wit.pl)
The inputs of photosynthesis are light energy, and matter in the form of water absorbed through the roots, and carbon dioxide absorbed through the leaves. (e-wit.pl)
Understand Figure 10.6 for an overview of photosynthesis (light reaction and Calvin cycle or carbon fixation). (e-wit.pl)
Reactants - CO 2, … During photosynthesis, plants used the sun's energy to change water and carbon dioxide into glucose, a carbohydrate energy source. (e-wit.pl)
Given the low solar energy density on the earth's surface and the inefficiencies of photosynthesis, robust biomass production systems that are optimized for the local environment and which have the greatest energy-return-on-investment are (EROI) desirable for producing biofuels. (biomedcentral.com)
Chlorophyll3
P700, or photosystem I primary donor, is the reaction-center chlorophyll a molecular dimer associated with photosystem I in plants, algae, and cyanobacteria. (wikipedia.org)
When photosystem I absorbs light, an electron is excited to a higher energy level in the P700 chlorophyll. (wikipedia.org)
Photosystem I operates with the functions of producing NADPH, the reduced form of NADP+, at the end of the photosynthetic reaction through electron transfer, and of providing energy to a proton pump and eventually ATP, for instance in cyclic electron transport. (wikipedia.org)
Eventually, the electron is transferred to the protein ferredoxin, causing it to transform into its reduced form, which subsequently finalizes the process by reducing NADP+ to NADPH. (wikipedia.org)
Molecules1
Significantly, we show that the energetic requirements for producing oil and starch relative to the recoverable energy stored in these molecules are very similar on a per carbon basis. (biomedcentral.com)
Carbohydrate1
In this review, we examine the thermodynamic and kinetic constraints associated with the autotrophic conversion of inorganic carbon into storage carbohydrate and oil, the dominant energy storage products in Chlorophytic microalgae. (biomedcentral.com)
Reaction2
What are the reactants and products of the light independent reaction? (e-wit.pl)
Finally, from the energy security perspective a production failure in an algal pond can generally be brought back on line in a matter of days whereas a crop failure in a terrestrial crop production system may take up to a year before another harvest can occur. (biomedcentral.com)
Unit1
Inevitably, however, the special pair of P700 behaves as if it were just one unit. (wikipedia.org)