Porphyrias are the group of orphan diseases, related to pathological disruptions heme biosynthesis. These diseases hard diagnose timely and existing methods lack universality. High performance liquid chromatography coupled with ultraviolet detector could be adapted for this purpose via determination porphyrins in human urine. Waters Acquity UPLC H-CLASS diode matrix was used study. Developed me...

We describe several techniques developed by the High Resolution Fly’s Eye experiment for measuring aerosol vertical optical depth, aerosol horizontal attenuation Preprint submitted to Elsevier Science 5 February 2008 length, and aerosol phase function. The techniques are based on measurements of side-scattered light generated by a steerable ultraviolet laser and collected by an optical detector...

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The Swept Wavelength Optical Resonant Raman Detector (SWOrRD) at the Naval Research Laboratory is scanned through the 220 nm to 260 nm window of the ultraviolet and generates two dimensional spectral maps allowing for rapid identification of chemical materials. We create a library of chemicals whose Raman spectral features partially overlap and then measure the mixtures created by combinations ...

We present a candidate Reference Method for determining the concentration of serum creatinine. The method is based on HPLC combined with enzymatic determination. Creatinine plus 14[C]creatinine is extracted by cation-exchange chromatography, subjected to reversed-phase HPLC, and finally quantified enzymatically. Enzymatic measurement ensures no interference from co-eluting compounds, which has ...

Abstract In order to clarify the distribution law of radiation optical field gas insulated switchgear disconnector defect and determine detection range partial discharge sensor, model based on uniform geometrical theory diffraction is established ray tracing method, light calculated when occurs at key positions such as basin insulator, shield, support insulator barrel. Based maximum irradiance,...

background: wearing spectacles is the most common approach in correcting the refractive errors worldwide. due to harmful effects of overexposure to solar ultraviolet radiations, the usage of multi-layer coatings in ophthalmic lenses has recently been increased. these lenses can reduce the reflections and hence increase the transmission of visible light; they can also decrease the transmission o...

In this work, a robust stand-off alpha detection method using the secondary effects of alpha radiation has been sought. Alpha particles ionise the surrounding atmosphere as they travel. Fluorescence photons produced as a consequence of this can be used to detect the source of the alpha emissions. This paper details experiments carried out to detect this fluorescence, with the focus on photons i...