KM values of both entrapped- and free-enzyme systems show that there were no
diffusional limitations or denaturing character in the entrapment procedure of enzymes [67].
By keeping the advantage of unlimited access and better reproducibility compared to primary cells, the new co-culture described in the present paper features two functionally important barriers for pulmonary drug delivery, i.e., a
diffusional epithelial barrier and macrophage-mediated clearance.
This study has shown that the concentration of the osmotic treatment influences directly the
diffusional coefficient of water and salt in the process, obtaining a balance between 270 < min < 300.
Under these conditions,
diffusional resistances are not inversely proportional to flow rate increase.
Through the analysis of the temperature dependence of EISF, it was possible to infer that the gel to liquid phase transition entails (i) softening of the interchains interaction, (ii) an increase of the segmental motion occurring in the final part of the acyl chain, and (iii) a change of the
diffusional dynamics from a very localized rattling-like motion to a confined diffusion.
It is felt that the hypoxemia originated from decreased
diffusional capacity.
Typically, the drug loading capacity and loading efficiency are dependent on the overall exposed surface area for drug uptake via either
diffusional or surface adsorption processes.
In sections on insight into chemical engineering, fundamentals and problem-solving profile, and backbone materials, he discusses such topics as basic principles and introduction to calculation, numerical methods and chemical engineering computations, fluid flow and the transport of fluids, two-phase gas-liquid
diffusional operations: distillation and absorption, and chemical plant design and process economics.
Another force causing the field inhomogeneity around capillary is due to the proton diffusing out toward the tissue, which is called the
diffusional narrowing regime (DNR) effect.
In order to determine the rate and drug transport mechanism of Clarithromycin from controlled release tablets, the dissolution profiles were fitted in various kinetic/mathematical models given as under Zero-Order Kinetics (W=K1t), First-Order Kinetics [ln (100-W)=In100-K2t], Higuchi Kinetics (W=K4 t ) Hixson Crowell Kinetics (100-W) 1/3 =1001/3-K3t), Korsmeyer's Peppas's Kinetics (Mt/M8 = K5tn).7 In Korsmeyer's Peppas Kinetic model an (n) value which is a
diffusional exponent defines the mechanism of drug transport from matrix tablets.
