Biology 2485B Lecture 5: Lecture-8-Ion-and-Water-Balance-6
17 Dec 2015
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Lecture 8 ion and water balance 6: coral acidification. Some ions are more important than others: na+, k+, ca2+(important signaling molecule, its balance is vital), h+(number of protons in a solution drives acid-based physiology & chemistry) ph: back to (acids &) base-ics. Ph=-log[h+] logarithmic measure of hydrogen ion concentration small differences in ph = large differences in [h+] What is ph determined by soren sorenson in 1909. Ph of a solution is the power of hydrogen, or the logarithmic measure of hydrogen ion concentration. Protons are useful for motor forces accumulate a lot of protons without affecting ph by a lot. Changes protonation state of weak bonds needed for substrate binding/product release. Increase ph= protein residues may be entirely unprotonated (ie. coo-) Decrease ph=protein residues may be entirely protonated (ie. cooh) not charged. All boils down to enzymes and their ability to help drive metabolism. What is sensitive are ionized groups of proteins like carboxyl groups.
