There is no real point of conflict between our views and those expressed by Professor Hill. The mere agreement of the figures for P.D., considered abstractly and apart from experimental conditions, is not a proof of the existence of a Donnan equilibrium. For example, in an experiment in which the protein were omitted altogether there would also be agreement of the r.D. values, for each would be...

Electrical potentials in cell walls (psi(Wall)) and at plasma membrane surfaces (psi(PM)) are determinants of ion activities in these phases. The psi(PM) plays a demonstrated role in ion uptake and intoxication, but a comprehensive electrostatic theory of plant-ion interactions will require further understanding of psi(Wall). psi(Wall) from potato (Solanum tuberosum) tubers and wheat (Triticum ...

abstract background: inadequate dialysis is one of the main causes of mortality of the patients undergoing hemodialysis. the methods that lead to improvement of dialysis adequacy in these patients are of great importance due to them causing an improvement of quality of life. as numerous factors can play a role in improvement of dialysis adequacy, the present study aimed to investigate the level...

dialysis as therapeutic solution for chronic kidney dysfunctions by itself is a chronic stress for patients and can lead to psychological problems in them. this study examined the psychological well-being of two dialysis (no=100) and non-dialysis (no=100) patients in two hospitals – shahid hashemi nejad and imam khomeini hospitals – during the earl y year of 1992. the scale of scl-90-r was used...

the concentrations of serum calcitonin', parathormone (pth), amylase, alkaline phosphatase (alkp), calcium and phosphorus were studied in pre-and post-dialysis patients with chronic renal failure. all patients had extremely elevated serum urea and creatinine concentrations with the mean values of143.8 and 10.5 mg/dl respectively. the plasma amylase activity was higher than normal with a me...

Chloride concentration ([Cl-]) was measured in defined organellar compartments using fluorescently labeled transferrin, alpha2-macroglobulin, and cholera toxin B-subunit conjugated with Cl--sensitive and -insensitive dyes. In pulse-chase experiments, [Cl-] in Tf-labeled early/recycling endosomes in J774 cells was 20 mM just after internalization, increasing to 41 mM over approximately 10 min in...

An extension of the stoichiometric displacement (SD) model for the ion-exchange adsorption of dilute proteins is developed which accounts for the effects of hydrogen ion Donnan equilibrium on the protein charge. The ability of the new model to fit retention data when the fluid phase pH is near the protein pI and the effects of hydrogen ion Donnan equilibrium are important is examined using four...

The paper discusses the anomalies of the former interpretation of the working mechanism of the ion-selective electrodes. It was thorougly discussed why the Donnan experiment could not be applied as the theoretical background of glass electrodes. It was assumed according to the Donnan interpretation that the measurable potential is produced by the transfer of the primary ion through the membrane...

We have developed intelligent polymerized crystalline colloidal array (IPCCA) chemical-sensing materials for detection of Pb(2+) in high ionic-strength environments such as body fluids with a detection limit of <500 nmol L(-1) Pb(2+) (100 ppb). This IPCCA lead sensor consists of a mesoscopically periodic array of colloidal particles polymerized into an acrylamide hydrogel. The array Bragg-diffr...

Nanofiltration performance as a function of feed temperature is relevant to several industrial settings including pretreatment for scale control in thermal desalination. Understanding of solute transport as a function of temperature is critical for effective membrane and system design. In this study, nanofiltration is modeled at 22, 40 and 50C using the Donnan Steric Pore Model with dielectric ...