Bengkulu is a province that in the top five as coffee producer archipelago. The survey proves has fairly large potential for producing with many local products from city plantations are already circulating market. Caffeine type of alkaloid found beans, tea leaves, and cocoa beans. This study aims to determine caffeine content (Rejang Lebong, Kepahiang, Seluma) using Ultraviolet Spectrophotometr...

We report the identification, in an Extreme Ultraviolet Explorer (EUVE) spectrum, of a hot white dwarf companion to the 3rd magnitude late-B star θ Hya (HR3665, HD79469). This is the second B star+white dwarf binary to be conclusively identified; Vennes et al. (1997), and Burleigh & Barstow (1998) had previously reported the spectroscopic discovery of a hot white dwarf companion to the B5V star...

Among uremic toxins in the middle molecular mass range, 1H, 13C-nuclear magnetic resonance, ultraviolet spectrometry, and chromatographic analyses allow identification of the main component of the so-called "2-5-3 fraction" as ascorbic acid 2-sulfate, a conjugated metabolite of ascorbic acid. We previously (Clin Nephrol 1986;25:212-8) showed an inhibitory effect of the 2-5-3 fraction on microtu...

Regarding the outdoor behavior of the Caucasian population, modern sunscreens should provide high and broad-spectrum ultraviolet protection in the ultraviolet B as well as in the ultraviolet A range and should be photochemically stable for ultraviolet doses, which can be expected in solar radiation. At present an assessment of the photostability of suncare products is not a general requirement ...

Several applications in material science and magnetic holography using extreme ultraviolet (EUV) radiation require the measurement of the degree and state of polarization. In this work, an instrument to measure simultaneously both parameters from EUV pulses is presented. The instrument determines the Stokes parameters after a reflection on an array of multilayer mirrors at the Brewster angle. T...