Search results
Results from the WOW.Com Content Network
In plants, carbonic anhydrase helps raise the concentration of CO 2 within the chloroplast in order to increase the carboxylation rate of the enzyme RuBisCO. This is the reaction that integrates CO 2 into organic carbon sugars during photosynthesis , and can use only the CO 2 form of carbon, not carbonic acid or bicarbonate.
In plants, algae, and cyanobacteria, photosynthesis releases oxygen. This oxygenic photosynthesis is by far the most common type of photosynthesis used by living organisms. Some shade-loving plants (sciophytes) produce such low levels of oxygen during photosynthesis that they use all of it themselves instead of releasing it to the atmosphere. [12]
Carbonic anhydrase needs a family of carbon base enzymes for the hydration of carbon dioxide and acid–base homeostasis, that regulates PH levels in life. [32] [33] In plant life, liquid water is needed for photosynthesis, the biological process plants use to convert light energy and carbon dioxide into chemical energy. [34]
Carbonic anhydrases (CAs) are a large family of zinc metalloenzymes that catalyze the reversible hydration of carbon dioxide. They participate in a variety of biological processes, including respiration, calcification, acid-base balance, bone resorption, and the formation of aqueous humor, cerebrospinal fluid, saliva, and gastric acid.
Plants and yeast have anion transporters that in both the pericycle cells of plants and the plasma membrane of yeast cells export borate or boric acid (pKa = 9.2). [5] In A. thaliana , boron is exported from pericycle cells into the root stellar apoplasm against a concentration gradient for uptake into the shoots.
The first experiments indicating that some plants do not use C 3 carbon fixation but instead produce malate and aspartate in the first step of carbon fixation were done in the 1950s and early 1960s by Hugo Peter Kortschak and Yuri Karpilov. [5] [6] The C 4 pathway was elucidated by Marshall Davidson Hatch and Charles Roger Slack, in Australia ...
Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!
The reaction catalyzed by CA1 is the same as other carbonic anhydrase family proteins: + (in tissues - high CO 2 concentration) [9]. The CA1-catalyzed reaction has a relatively low reaction affinity (Km) of 4.0 mM for CO 2, [7] [10] turnover number (Kcat) of 2 × 10 5 s −1, and catalytic efficiency (Kcat/Km) of 5 × 10 7 M −1 s −1 comparing to other isozymes of the α-CA family of ...