Ion-exchange membranes were used in conjunction with neutron-activation analysis and anodic stripping voltammetry for the determination of certain trace metal ions. The various parameters which govern the applicability, limitations and sensitivity of the methods were investigated. A new membrane "barrier" electrode assembly was introduced and found to be useful for the anodic stripping determin...

Nutrient uptake by a primitive cell would have been limited by the permeability characteristics of its membrane. We measured the permeabilities of model protocellular membranes to water, five of the six pentoses, and selected aldohexoses, ketohexoses, and three to six carbon alditols by following volume changes of vesicles after the addition of solute to the external medium. Solute hydrophobici...

Allogenic Cartilage Regeneration A novel immunoisolation strategy based on a hybrid synthetic–natural electrospun semipermeable membrane is reported in article 2203084 by Yujie Hua, Yixin Zhang, Guangdong Zhou, Xiaoyun Wang, and co-workers. The mechanism dependent preventing immune cell attack the physical barrier blocking negative regulatory effect mediated destructive inflammatory factors, th...

A miniature fiber optic spectrometer enclosed within a semipermeable (dialysis) membrane is proposed for in vivo interstitial sensing applications. The semipermeable membrane acts as a molecular filter, allowing only small molecules to pass through to the sampling volume. This filtering, in principle, should enable continuous in vivo drug sensing, removing the necessity for complex microdialysi...

By means of N -body simulations, we consider self-gravitating open systems enclosed in a spherical container with semipermeable reflecting walls, in order to investigate the thermodynamics of the evaporation process in self-gravitating N -body systems (such as the escape of stars from globular clusters). To simulate the evaporation process, when the energy of a particle exceeds a certain thresh...

drinking water has received considerable attention recently. however, misuse and mismanagement have resulted in a rapid and widespread decline in source-water quality and supply. water quality guidelines can be used to identify constituents of concern in water, to determine the levels to which the constituents of water must be treated for drinking purposes. membrane technology for the water cyc...