John L. Weber

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BACKGROUND Millions of people worldwide consume arsenic-contaminated rice; however, little is known about the uptake and bioavailability of arsenic species after arsenic-contaminated rice ingestion. OBJECTIVES In this study, we assessed arsenic speciation in greenhouse-grown and supermarket-bought rice, and determined arsenic bioavailability in cooked(More)
In this study, a number of slurry-phase strategies were trialled over a 42 day period in order to determine the efficacy of bioremediation for long-term hydrocarbon-contaminated soil (145 g kg−1 C10–C40). The addition of activated sludge and nutrients to slurries (bioaugmentation) resulted in enhanced hydrocarbon removal (51.6 ± 8.5 %) compared to(More)
A population-based study of human immunodefi ciency virus in south India reveals major diff erences from sentinel surveillance-based estimates. Study Group. Declining HIV infection rates among recently married primigravid women in Pune, India. Polybrominated diphenyl ethers (PBDEs) are a group of brominated compounds (209 congeners) that are typically used(More)
After CHORIMAC-8 and CHORIMAC-12 a new multichannel cochlear implant is presented, characterized by its totally numeric sound signal processing. Owing to FFT the whole speech information is cut into 15 channels, then sequentially transmitted to an implanted receptor and electrode bearer. This digital processing provides the new system with several(More)
Research efforts have been directed towards constructing a fully automated microcomputer-controlled bench-scale 'batch-type' chemical reactor [1-6]. This fully automated reactor can execute repetitive experiments on an approximately 50 ml scale, providing important chemical reaction data during early stages of process development research programmes. The(More)
Monomac monochannel and Minimac multichannel cochlear implants bring to the remaining hearing fibers sound information that is previously converted into adequate electric signals. Both function at constant currents. The Monomac monocanal system possesses only one electrode implanted either inside or outside the cochlea and sends off sound of basic laryngeal(More)
The sound information is sequentially transmitted to 12 electrodes implanted in the cochlea. An electrode bearer introduced through the round window is now commonly used. Frequencies between 100-4 000 Hz and intensities between 40-100 db are only transmitted in a 3 msec time sampling. The output signal is a positive square wave followed by an equal negative(More)
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