Shear-flow-induced structure formation in surfactant-water mixtures is investigated numerically using a meshless-membrane model in combination with a particle-based hydrodynamics simulation approach for the solvent. At low shear rates, uni-lamellar vesicles and planar lamellae structures are formed at small and large membrane volume fractions, respectively. At high shear rates, lamellar states ...

The relation between the handedness of helical twist and the S-shaped cross section of the lamellar crystals is discussed for linear polyethylene. The lamellar crystals are found to rotate so that the convex surfaces of "S" push aside the melt when they advance in the growth direction. This relation, which has not been examined sufficiently so far, is found to be opposite from what was proposed...

We consider DNA-cationic lipid complexes that form lamellar stacks of lipid bilayers with parallel DNA strands intercalated in between. We calculate the electrostatically induced elastic deformations of the lipid bilayers. It is found that the membranes undulate with a periodicity that is set by the DNA interaxial distance. As a consequence the lamellar repeat distance changes resulting in a sw...

purpose: to assess parameters that had a capability of influencing the rate of big bubble formation during deep anterior lamellar keratoplasty (dalk) in keratoconus. methods: a total of 290 consecutive eyes from 257 patients with keratoconus that underwent dalk using the big-bubble technique were enrolled. the influence of patient age and sex, family history of keratoconus, history of contact l...

purpose: to compare the clinical outcomes following deep anterior lamellar keratoplasty (dalk) for keratoconic patients with vernal keratoconjunctivitis (vkc) and without vkc. methods: in this retrospective comparative study, the records for 262 eyes with keratoconus only (group 1) and 28 keratoconic eyes with vkc (group 2) that underwent dalk were complied. the parameters reviewed included the...

purpose: to evaluate the prevalence, natural course, and final visual acuity in patients with stages iii or iv of diffuse lamellar keratitis (dlk) following laser in situ keratomileusis  (lasik). methods: in this descriptive study, records of all the patients who underwent lasik surgery in two private excimer laser clinics were reviewed. according to linebarger- lindstrom-hardten classification...