Membrane rigidification

Deleers M, Servais JP, Wulfert E (1986) Neurotoxic cations induce membrane rigidification and membrane fusion at micromolar concentrations. Biochim Biophys Acta 855 271-276... 

A, multiple PL-PL bonding between PL s themselves [ 0-P-0-Ca-0-P-0 ] inducing partial separation of charged PL s into discrete domains. At high Ca concentrations this causes membrane rigidification. 

Li, Y., Chung, T.S., Cao, C., and Kulprathipanja, S. (2005) The effects of polymer chain rigidification, zeolite pore size and pore blockage on polyethersul-fone (PES)-zeolite A mixed matrix membranes./. Memhr. Sci., 260, 45-55. 

The state of order or fluidity of the acyl chains of amphiphilic molecules is known to be a characteristic property of each membrane lipid, and was analyzed by FTIR using the peak position of Vs(CH2). In Fig. 1, the phase transition behavior of the acyl chains of lipid A is presented, as a plot of the peak position of Vs(CH2) versus temperature. It can be seen from the change in the wavenumber values, that in the presence of the peptide only a slight shift to lower wavenumbers, and a concomitant increase in the phase transition temperature Tc takes place. This corresponds to a slight rigidification of the lipid A acyl chains. 

Li Y, Chung TS, Cao C, Kulprathipanja S. The effect of polymer chain rigidification, zeolite, pore size and pore blockage on polyethersulfone (PES) zeolite a mixed matrix membrane. J Membr Sci 2005 260(l-2) 45-55. 

Polyvinyl acetate (PVAc) is another rubbery polymer used in mixed-matrix research. Its flexible nature helps to prevent void formation at the solid-polymer interface. Although it may not have practical industrial applications, PVAc aids in developing proof-of-concept associated with mixed-matrix membranes. Zeolite 4A-PVAc membranes have been proven to enhance membrane selectivity in mixed-matrix membranes with only 15 vol% zeolite " however, the permeability is lower than predicted presumably due to matrix rigidification. The rubbery nature of PVAc allows for more polymer relaxation at the solid-polymer interface as compared to the case with traditional, glassy polymers." ... 

---