Being a fan of WOOL, I grabbed the Kindle copy and devoured it. I had been writing my novel, Dead Sleep, for a couple weeks already and had made good progress when I saw Hugh tell about Davies’ WOOL fanfiction story, The Runner. But, it was a blog post by Howey about Davies in January 2013 that propelled me on the course I find myself now. Of course, I’ve well-documented my reliance on Hugh Howey and his blog in the early part of 2013 and it was really Hugh’s story that encouraged me to get started with my career in self-publishing. He may not even know it, but he was a huge inspiration when I first started writing last year. View willswardstrom’s profile on Instagram.
Will Swardstrom Inte… on Meet The Immortals - D.K… Veronica Gochnour on Meet The Alt.Historians… Willswardstrom on Meet The Alt.Historians… MARTHA (or the problem with making your universe smaller)Įpisode 20 | Will Sw… on Applauding the Ladies -….The model also predicts that the pH gradient across the cortical plasma membrane has the most distinct effects on redistribution of ABA into the xylem sap of stressed plants and, additionally, that the ABA concentration in the rhizospheric aqueous solution can play an important role in root-to-shoot signalling. The simulation shows that ABA redistribution in roots caused by changing pH gradients can account for up to a 2 to 3-fold accumulation of ABA in the xylem sap of stressed plants. Therefore, we have incorporated compartmental pH values of unstressed and stressed root cells, the permeability coefficients of root membranes for ABA and anatomical data into a mathematical model, similar to that of Slovik et al. It is appropriate to ask whether these mechanisms also contribute to ABA compartmentation and redistribution in the root system. The validity of this concept has been shown repeatedly and was confirmed by a mathematical leaf model (Slovik et al. 1988) and decreases slightly the cytosolic pH. Indeed, stress increases the apoplastic pH (Hartung et al. Applying this concept, a flattening of the intracellular pH gradients increases the apoplastic ABA concentration. ABA distributes among the leaf compartments according to the anion trap concept and the Henderson-Hasselbalch equation, with the free acid as the permeating and the anion as the nearly non-permeating molecular species.
Xylem vessels are in direct contact with the leaf apoplasm, the only leaf compartment that is directly connected with the primary site of ABA action, the outer surface of the guard cell plasma membrane (Hartung 1983). Abscisic acid (ABA) is a stress signal that is transported from the root system to leaves, and induces stomatal closure before water relations of the leaves are affected by soil drying.
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