A photovoltaic device for converting light into electrical power includes a film (16, 26, 36) of silicon nanoparticles. The silicon nanoparticle film, which can be a multilayer film, has a photoluminescence response and couples light and or electricity into semiconductor layers. A particular example photovoltaic device of the invention include a solar cell that accepts and converts light of a predetermined wavelength range into electrical power. A film containing luminescent silicon nanoparticles is optically coupled to the solar cell.

The method of detecting thalassemia by optical analysis of blood components is a spectral detection method that is based on the fluorescence spectra of a set of biomolecules, including tyrosine, tryptophan, nicotinamide adenine dinucleotide, and flavin adenine dinucleotide, which are all found in blood plasma, and porphyrin, which is found in red blood cells (RBCs).

A method for increasing the shelf life of donor blood contemplates the following steps. In the first step blood is transferred to a sterile container and mixed with an anticoagulant as indicated in step 20. The anticoagulant and donor blood are centrifuged in step 22 at about 4,000 rpm for about 15 minutes. After centrifuging the red blood cells are separated and placed in a sterile tube. In the next step the red blood cells are irradiated by a laser that emanates a wavelength of about 633 nm for a time period of about 24 hours.

The synthesis of silver nanoparticles from Pimpinella anisum L seeds includes providing a silver nitrate (AgNO3) solution, providing an extract of Pimpinella anisum L. plant seeds, and combining the silver nitrate solution with the extract of the Pimpinella anisum L. plant seeds to produce silver nanoparticles. The synthesis of silver nanoparticles from Pimpinella anisum L. seeds does not require toxic chemical solvents.