All ultrafiltration devices have in common a semipermeable membrane and a means for creating a pressure difference across it. They differ only in the configuration of the membrane, the nature of the force used to create a pressure difference, and the ease with which the environment of the plasma can be controlled so as to simulate physiological conditions. Speed of producing ultrafiltrate provi...

We are submitting this series of experiments as observed facts, realizing that there are so many uncertainties in this form of indirect observation that great caution must be exercised in drawing conclusions of any kind. The most serious of the possible errors involved is that the active substances which we have studied, the enzyme-the bacteriophage-and the several varieties of virus, may not b...

It is obvious that the factors considered in this paper render data obtained by ultrafiltration open to criticism unless they are checked by other methods and precautions are taken for the elimination of the vitiating effects which have been described. As regards the mechanism of ultrafiltration, the view of a sieve-like action as most experimental evidence indicates, is adequate, if all the fa...

Membrane processes have been successfully employed for treatment of a large number of industrial effluents. Reverse osmosis (RO) and ultrafiltration (UF) are versatile separation and purification tools for the process industries. Both of these techniques are based on the ability of pressure-driven filtration membranes to separate multi-component fluids based on molecular size, shape, and chemic...

Although apparently the first effective parathyroid extract was prepared by Moussu in 1898, some time elapsed before Hanson (1926) and Collip (1925) clearly demonstrated that an active extract of consistent potency could be prepared by using hot dilute hydrochloric acid. Since that time there have been a number of attempts to purify such extracts further. Some further purification was achieved ...

____________ _ Cardiopulmonary bypass (CPB) may result in hemodilution and volume overload. Restoration of a normal hematocrit is important for post-operative myocardial performance. Diuretics, conventionally used in the post-operative period may be ineffective due to renal impairment or lead to electrolyte imbalance. Hollow-fiber hemofilters, made of an anisotropic polysulfone membrane (AMICON...

Aggressive diuretic therapy in a patient who is hospitalized for acute decompensated heart failure often leads to progressive renal dysfunction despite persistent congestion. The underlying mechanisms of this so-called acute cardiorenal syndrome are complex and not fully understood.1,2 As initial therapy in this setting, ultrafiltration as compared with diuretic therapy may result in a higher r...

The unsteady-state permeate flux response to a step change in the transmembrane pressure stirred ultrafiltration cell was studied. changes gel-layer concentration and growth, with were Metal solutions prepared polymeric solvent, dynamics of operating parameters on this process process, hybrid called Polymer Enhanced Ultrafiltration, (PEUF) modeled mathematically validated using experimentation ...