Surface acoustic wave (SAW) technology provides a sensitive platform for sensing chemicals in gaseous and fluidic states with the inherent advantages of passive and wireless operation. In this review, we provide a general overview on the fundamental aspects and some major advances of Rayleigh wave-based SAW sensors in sensing chemicals in a gaseous phase. In particular, we review the progress i...

The gas-phase chemistry of silicon oxynitridation in N2O has been investigated. From an evaluation of available kinetic data, we have developed a model for the thermal decomposition of gaseous N2O. To quantify heat transfer between the N2O gas and the wall of the furnace, we introduce the concept of referencing to an N2 gas-temperature profile, measured in an oxidation furnace. Using this model...

We describe a recently developed in vitro assay for the assessment of the cytotoxicity of gaseous materials. The method is based on the pollen tube growth (PTG) test suited to determine the cytotoxicity of non-gaseous, water-soluble substances (Kristen and Kappler, 1995). Instead of the conventional PTG test, we used a semi-automatic, computer-controlled multi-channel device for the injection o...

Stars may not accumulate their mass steadily, as was previously thought, but in a series of violent events manifesting themselves as sharp stellar brightening. These events can be caused by fragmentation due to gravitational instabilities in massive gaseous disks surrounding young stars, followed by migration of dense gaseous clumps onto the star. Our high-resolution near-infrared imaging has v...

This work considers the momentum transport and mass transfer of O2 in a novel aerial rotating disk bioreactor (RDB) for animal cell or tissue culture. Specifically, this design uses a rotating lid placed above the surface of the culture medium to provide a stirring mechanism, which has potential benefits of enhanced gas transfer, reducing possible contamination, and better access to the culture...

The effect of gaseous ozone and hot water, alone or in combination, on the sensory and microbial quality of cantaloupe melon was investigated. Escherichia coli O157:H7 transmission from the rind to edible melon flesh during cutting practices was also investigated. Four different treatments consisting of hot water (75 degrees C, 1min), gaseous ozone (10,000ppm, 30min), gaseous ozone supplied by ...

A special version of Conditional Moment Closure – PCMC – is suggested for modeling reacting flows in porous media. The model involves conditioning on a special tracer scalar, which is introduced to characterize scalar transport in the gaseous phase. (i.e. for the flow in the interparticle space or in the pores). The model accounts for interparticle variations of species concentrations and emula...

The effect of the gaseous medium composition on electrically conductive properties In 2 O 3 -Ga films obtained by halide vapor phase epitaxy has been studied. temperature range 100-550 o C, exhibit high sensitivity to H , NH and possess hyphen performance low base resistance. A qualitative mechanism for gases is proposed. Keywords: vapor-phase epitaxy, gas sensitivity.

We have investigated the energetics of DNA condensation by multivalent polyamine cations. Solution small angle x-ray scattering was used to monitor interactions between short 25 base pair dsDNA strands in the free supernatant DNA phase that coexists with the condensed DNA phase. Interestingly, when tetravalent spermine is used, significant inter-DNA repulsion is observed in the free phase, in c...

In this contribution a chip-integrated amperometric sensor for the detection of H2O2 in exhaled breath condensate (EBC) is reported. The electrode chip is characterized, and detection of H2O2 in an aqueous phase is shown by means of cyclic voltammetry (CV) and amperometry. Variation of conditions such as the composition of the supporting electrolyte largely influences the obtained electrochemic...