David Foss

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Aqueous purine solutions in the absence and presence of NaCl have been studied by vapor-pressure osmometry and high-resolution proton-magnetic-resonance spectroscopy. The presence of NaCl causes a marked change in the temperature dependence of the molal osmotic coefficient and the chemical shift of the purine resonances when compared with the corresponding(More)
An embedded ternary CAM macro derived from a 9M stand alone part with die size of 148 mm/sup 2/ uses a novel 3.542 /spl mu/m/sup 2/ SRAM half-cell on a standard 0.13 /spl mu/m logic process. In the embedded form it takes 13 mm/sup 2//Mbit. The macro achieves 166 M-searches/s with low power, under 0.5 W/Mbit. A divided match line greatly reduces the power(More)
High-performance liquid chromatography (HPLC)-size exclusion chromatography (SEC) with ultraviolet absorbance (UVA) and on-line dissolved organic carbon (DOC) detectors has been adapted and optimized under various conditions. An enhanced HPSEC-UVA system employing a modified commercially available DOC detector provides a better understanding of the(More)
High performance size exclusion chromatography (HPSEC) with ultraviolet absorbance (UVA) detection has been widely utilized to estimate the molecular weight (MW) and MW distribution of natural organic matter (NOM). However, the estimation of MW with UVA detection is inherently inaccurate because UVA at 254 nm only detects limited components (mostly pi(More)
Determinations of perchlorate anion (ClO(4)(-)) transport and rejection were performed using a surfactant modified ultrafiltration (UF) membrane. Perchlorate anion (at a concentration of 100 microg/L of ClO(4)(-), spiked with KClO(4)) was introduced to the membrane as a pure component, in binary mixtures with other salts, cationic and anionic surfactants,(More)
To elicit information on endoscope cleaning practices and the perceived risk of cross-infection, questionnaires were mailed to 500 physicians and 1,000 gastroenterology nurses and associates in November and December 1991. The survey results indicated that while the majority (83% of nurse/associates and 82% of physicians) expressed satisfaction with current(More)
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