OBJECTIVES Refractometric methods to measure total protein (TP) in serum and plasma specimens have been replaced by automated biuret methods in virtually all routine clinical testing. A subset of laboratories, however, still report using refractometry to measure TP in conjunction with serum protein electrophoresis. The objective of this study was therefore to conduct a modern performance evalua...

The object of this study was to evaluate the usefulness of measuring the differences in the values of the serum total protein (DVSTP) concentration of foals and the refractometry index (DVRI) of the milk of dams before and after nursing of the colostrum for assessing failure of passive transfer (FPT) in foals. Serum samples from 31 foals were collected before the first nursing and other 1 to 6 ...

AIM To determine relation between near work and myopia progression in student population. Causes of myopia occurrence are not sufficiently explained. METHODS This retrospective-prospective, descriptive research included 100 students with verified myopia up to -3 Dsph. Ophthalmological examination and measurement diopter-hours variable (Dh) were done twice, in the period from January 2011 unti...

Gas modulation refractometry (GAMOR) is a methodology for assessment of gas refractivity, molar density, and pressure that, by rapid modulation, exhibits reduced susceptibility to various types disturbances. Although previously demonstrated experimentally, no detailed analysis its ability reduce the pickup drifts has yet been given. This work provides an explication what extent modulated in gen...

A 2-year-old female cockatiel was presented for abdominal swelling of 3 weeks duration. The bird appeared otherwise normal. On physical examination, the abdomen was distended, but no masses were palpable. Abdominocentesis was performed, and 0.5 mL of fluid was removed and submitted to Antech Diagnostics for fluid analysis and cytology. The fluid was light yellow and hazy and had a specific grav...

We demonstrate tomographic imaging of the refractive index of turbid media using bifocal optical coherence refractometry (BOCR). The technique, which is a variant of optical coherence tomography, is based on the measurement of the optical pathlength difference between two foci simultaneously present in a medium of interest. We describe a new method to axially shift the bifocal optical pathlengt...

A technique for high-precision and high-accuracy assessment of both gas molar (and number) density pressure, Gas Modulation Refractometry (GAMOR), is presented. The achieves its properties by assessing refractivity as a shift directly measurable beat frequency use Fabry-Perot cavity (FPC) based refractometry utilizing the Pound-Drever-Hall laser locking technique. Conventional FPC-based is, how...

We propose and demonstrate a novel approach to measure the size and refractive index of microparticles based on two beam optical trapping, where forward scattered light is detected to give information about the particle. The counter-propagating optical trap measurement (COTM) system exploits the capability of optical traps to measure pico-Newton forces for microparticles' refractive index and s...

PURPOSE In refractive surgery, measuring the total ocular profile of refraction gives more vital information than measuring the cornea alone. We report the first clinical experiments with spatially resolved refractometry using ray tracking principles. Tracey technology was developed in Ukraine by the Institute of Biomedical Engineering in cooperation with the Vardinoyannion Eye Institute of Cre...

This paper reports the measurement of refractive index (RI) and thickness of living cells using cell culture chip integrated with micro-indicators via immersion refractometry. In the experiment, the RI and the thickness of the cultured MadinDarby canine kidney (MDCK) cell line are obtained simultaneously. As this method features high accuracy, no damage to a group of the living cells and real t...