A Huygens bianisotropic medium is a linear homogeneous for which the principle can be formulated. When bounded 3D scattering object composed of medium, whether or not, embedded in excess field phasors inside that act as volume current densities, and tangential components internal on surface same to radiate identical external region.

Molluscan nacre is a fascinating biomineral consisting of a highly organized calcium carbonate composite that provides unique fracture toughness and an iridescent color. Organisms elaborately control biomineralization using organic macromolecules. We propose the involvement of the matrix protein Pif80 from the pearl oyster Pinctada fucata in the development of the inorganic phase during nacre b...

Pearl is an ancient organic gem with unique beauty, and has been treated as a treasure since times. From scientific point of view, pearls are produced in the bodies Pteria  and Pinctada  molluscs. The rich color diverse shape, formed by accumulation calcium carbonate (CaCO 3 ) containing minerals (aragonite) beads endocrine. This paper summarizes biological characteristics formation m...