Showing result 1 5 of 58 swedish dissertations containing the word permeation. The present work dealt with a fundamental study of nox adsorption desorption and transport in zsm 5 as films supported on cordierite monolith and as a part of composite membranes. The adsorption desorption study was focused on developing a mechanistic understanding of nox adsorption in zsm 5 films including the effects of counter ions, si/al ratios and film thicknesses on the adsorption. 2009, 114 pages 3382292 this dissertation focuses on the impact of molecular complexation on intestinal membrane permeation. Two cases in which molecular complexation in solution affects intestinal membrane transport are considered: 1 enhancement of membrane transport of low permeability drugs through ion pairing with lipophilic counterions and 2 reduction of apparent permeability of low solubility drugs as a consequence of complexation with cyclodextrins. Quasi equilibrium mass transport analyses were developed to describe: 1 the ion pair mediated octanol buffer partitioning and membrane permeation of the low permeability drugs phenformin, gs 4109, and zanamivir heptyl ester and 2 the effect of cyclodextrins on the membrane transport of the low solubility drug progesterone.

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The counterion 1 hydroxy 2 naphthoic acid hnap enhanced the lipophilicity of the low permeability drugs by up to 3.7 log units. As predicted from a quasi equilibrium analysis of ion pair mediated membrane transport, a log increase in permeability was observed per log increase in hnap concentration in the parallel artificial membrane permeation pampa and caco 2 monolayer assays. Only the rat jejunal permeability of zanamivir heptyl ester was enhanced by hnap and this was explained by its stronger binding constant 388 m 1 as compared to the phenformin hnap and gs 4109 hnap ion pairs 3 m 1 .

Key attributes for successful ion pair mediated membrane transport were proposed: 1 ion pair log p_ab value in the range of 2 5 to provide sufficient lipophilicity and 2 strong aqueous binding constant on the order of 100 10 m 1 to prevent ion pair dissociation during membrane permeation. The transport analysis quantitatively predicted the apparent permeability decrease of progesterone with increasing cyclodextrin concentration c_cd in the pampa, caco 2 monolayer, and rat jejunal perfusion assays. The model considers the effect of c_cd on both the apparent membrane permeability p_m and aqueous boundary layer permeability p_aq . The model revealed that: 1 p_aq increases with increasing c_cd.

As the boundary layer thickness quickly decreases as the progesterone bound fraction increases and 2 p_m decreases with increasing c_cd. In summary, this work provides an increased understanding of the underlying mechanisms that govern the effects of molecular complexation on intestinal membrane transport, and enables the more efficient and intelligent use of molecular complexation strategies to facilitate oral absorption. There are also more companies answering their plea to: write an essay for me and some are much better than others.

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Calculate the molar flow rate for each component and the non permeate and permeate streams. Include relevant graphs for the permeate and non permeate data such as: total permeate flux versus stage cut, percent oxygen recovery versus operating pressure, separation factor versus stage cut, etc. Calculate the separation factors for each stage and for the two , three , and four module system.

Compare the counter current data stages 1 amp 3 to the cocurrent data stages 2 amp 4. Calculate the mole percent of oxygen and nitrogen in the feed stream and compare this with literature values for air. To order for this question or a similar one, click the order now button and on the order form, fill all the required details then trace the discount code, type it on the discount box and click on use code to effect your discount. Western and middle eastern feminists in the international womens movement, 1911 1948. Kuhlman, anthony the beginning and end of heavy ion collisions: using uranium beams and bose einstein correlations as probes of the collision fireball. Collins, peter a combinatorial approach to the development of composition microstructure property relationships in titanium alloys using directed laser deposition. Varonis, orestes eddy current characterization of stressed steel and the development of a shaft torque eddy current system.

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