Cells of a naturally occurring strain of Pseudomonas cepacia grown in distilled water were exposed to ultraviolet radiation. Irradiated samples incubated on membrane filters or in fluid recovery media in the absence of light showed no evidence of dark repair mechanisms. When samples were exposed to fluorescent light ranging from 50 to 950 foot candles (538 to 10,222 lux) of illumination, appare...

Novel table-top sources of extreme-ultraviolet light based on high-harmonic generation yield unique insight into the fundamental properties of molecules, nanomaterials or correlated solids, and enable advanced applications in imaging or metrology. Extending high-harmonic generation to high repetition rates portends great experimental benefits, yet efficient extreme-ultraviolet conversion of cor...

HE PRINCIPAL SUBJECT MATTER of this paper is the description of a thod of obtaining a calibration curve relating apparent absorbancy 81) and concentration (x). It is frequently observed that the orbancy index decreases with increasing concentration in cases in ich one would expect Beer’s law, A = log(10/I) = KX, to hold. For ample, with our instrument, the absorbancy index at 273.5 m of a lutio...

The heats of vaporization of the room temperature ionic liquids (RTILs) N-butyl-N-methylpyrrolidinium bistrifluorosulfonylimide, N-butyl-N-methylpyrrolidinium dicyanamide, and 1-butyl-3-methylimidazolium dicyanamide are determined using a heated effusive vapor source in conjunction with single photon ionization by a tunable vacuum ultraviolet synchrotron source. The relative gas phase ionic liq...

Here we introduce a novel strategy for turbidimetric monitoring of bacterial growth in liquid culture. The instrumentation comprises a light source, a customized 3D printed culture tube holder and a miniaturized spectrophotometer, connected through optical cables. Due to its small footprint and the possibility to operate with external light, bacterial growth was directly monitored from culture ...

Measurement methods for determining the density of compressed materials, being a critical quality attribute, provide an important parameter successful processing. In this study, novel approach was developed compacts using ultraviolet–visible spectrophotometry. The assumption within context that change in affects corresponding color information compact. From obtained spectra visible range, compa...

Abstract Silicate minerals are widely used as green, nontoxic, low-cost materials. In this experiment, hydrophilic antifogging films of silicate were prepared by the vacuum evaporation coating method. The hydrophilicity, performance, optical properties, and surface morphology film materials analysed characterised contact angle meter, hydrothermal method, ultraviolet-visible spectrophotometer, a...

An ultraviolet source may be used in light mi-croscopy to excite visible fluorescence, increase resolution, or differentiate absorbing materials. The last two aims require ultraviolet-transmitting optics, usually of quartz, and have infrequently been sought by bacteriologists, especially since electron microscopy with its vastly increased resolving power became available. However, ultraviolet l...