PURPOSE To employ Mie scattering theory to predict the light-scattering from micrometer-sized particles surrounded by lipid shells, called multilamellar bodies (MLBs), reported in human age-related nuclear cataracts. METHODS Mie scattering theory is applicable to randomly distributed spherical and globular particles separated by distances much greater than the wavelength of incident light. Wi...

The spectral properties of light confined to low-index media by binary layered structures is discussed. A novel phase-based model with a simple analytical form is derived for the approximation of the center of arbitrary bandgaps of binary layered structures operating at arbitrary effective indices. An analytical approximation to the sensitivity of the bandgap center to changes in the core refra...

We report the theoretical comparison of the omnidirectional photonic bandgap (OPBG) of one-dimensional dielectric photonic structures, using three different refractive index profiles: sinusoidal, Gaussian, and Bragg. For different values of physical thickness (PT) and optical thickness (OT), the tunability of the OPBG of each profile is shown to depend on the maximum/minimum refractive indices....

The change in the refractive indices of salt solutions which results from the addition of 1 per cent of the “pseudoglobulins” of blood serum has been measured by Reiss.l His pseudoglobulins were prepared by fractional precipitation with ammoniun sulphate and purified by prolonged dialysis. Fraction I (Pseudoglobulin I) was precipitated at 32-36 per cent saturation with ammonium sulphate, fracti...

Prevention of peri-implantitis involves the early diagnosis peri-implant mucositis. This article presents a protocol hygienic maintenance in different implant prosthetic scenarios: single crown, fixed partial prosthesis, full-arch, and overdentures. Others clinical conditions have to be taken into consideration: patient compliance; history periodontitis; implants placed augmented bone; short, z...