Virtual ellipsometry on layered micro-facet surfaces.

Microfacet-based BRDF models are a common tool to describe light scattering from glossy surfaces. Apart from their wide-ranging applications in optics, such models also play a significant role in computer graphics for photorealistic rendering purposes. In this paper, we mainly investigate the computer graphics aspect of this technology, and present a polarisation-aware brute force simulation of light interaction with both single and multiple layered micro-facet surfaces.

Albumin-based or albumin-linked calibrators cause a positive bias in serum proteins assayed by the biuret method.

Background: Assay of total serum protein by the biuret method calibrated with albumin standards according to the reference method provides results with a positive bias approximately 3%-5% exceeding the total error of 3.4% allowable for total protein in serum analysis made by analysers using two-part reagents and short-term procedures.

Methods: We used two types of two-part biuret reagents utilised in a short-term measurement in analysers with albumin or serum calibrators, in which protein was attested by the Kjeldahl method.