We derive time-asymptotic decay rates in L for large disturbances to some important classes of solutions of the Cauchy problem for a number of uniformly parabolic equations, provided only that the disturbances belong to appropriate L spaces at initial time. Examples considered include the scalar nonlinear advection–di usion equation ut + f(u)x =(b(u)ux)x and the parabolic system ut + (u’(|u|))x...

There is a need for real-time non-invasive, continuous monitoring of cerebral blood flow (CBF) during surgery, in intensive care units and clinical research. We investigated a new non-invasive hybrid technology employing ultrasound tagged near infrared spectroscopy (UT-NIRS) that may estimate changes in CBF using a cerebral blood flow index (CFI). Changes over time for UT-NIRS CFI and Xenon sin...

Urea has a critical role in urinary concentration. Mice lacking the inner medullary collecting duct (IMCD) urea transporter A1 (UT-A1) and urea transporter A3 (UT-A3) have very low levels of urea permeability and are unable to concentrate urine. To investigate the role of UT-A1 in the concentration of urine, we transgenically expressed UT-A1 in knockout mice lacking UT-A1 and UT-A3 using a cons...

Following Swales’ (1981) definition of genre analysis many scholars have attempted to characterize good academic writing; however, this can be difficult and worrying for non-native writers. Since a well-written abstract encourages readers more effectively, the present study intended to find differences in the rhetorical structures of abstracts by TEFL students from the University of Tehran (UT)...

Urea is a small solute synthesized by many terrestrial organisms as part of the catabolism of protein. In mammals it is transported across cellular membranes by specific urea transporter (UT) proteins that are the products of two separate, but closely related genes, referred to as UT-A and UT-B. Three major UT-A isoforms are found in the kidney, namely UT-A1, UT-A2, and UT-A3. UT-A2 is found in...

Of the three major protein variants produced by the UT-A gene (UT-A1, UT-A2, and UT-A3) UT-A1 is the largest. It contains UT-A3 as its NH(2)-terminal half and UT-A2 as its COOH-terminal half. When being part of UT-A1, UT-A3 and UT-A2 are joined by a segment, Lp, whose central part, Lc, is not part of UT-A3 or UT-A2 but is present only in UT-A1. Lc contains the phosphorylation sites S486 and S49...