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https://www.readbyqxmd.com/read/25151998/establishing-the-reliability-and-concurrent-validity-of-physical-performance-tests-using-virtual-reality-equipment-for-community-dwelling-healthy-elders
#1
David Griswold, Kyle Rockwell, Carri Killa, Michael Maurer, Nancy Landgraff, Ken Learman
PURPOSE: The aim of this study was to determine the reliability and concurrent validity of commonly used physical performance tests using the OmniVR Virtual Rehabilitation System for healthy community-dwelling elders. METHOD: Participants (N = 40) were recruited by the authors and were screened for eligibility. The initial method of measurement was randomized to either virtual reality (VR) or clinically based measures (CM). Physical performance tests included the five times sit to stand, Timed Up and Go (TUG), Forward Functional Reach (FFR) and 30-s stand test...
2015: Disability and Rehabilitation
https://www.readbyqxmd.com/read/23959196/kinetics-of-nitric-oxide-and-oxygen-gases-on-porous-y-stabilized-zro2-based-sensors
#2
Sajin Killa, Ling Cui, Erica P Murray, Daniela S Mainardi
Using impedance spectroscopy the electrical response of sensors with various porous Y-stabilized ZrO2 (YSZ) microstructures was measured for gas concentrations containing 0-100 ppm NO with 10.5%O2 at temperatures ranging from 600-700 °C. The impedance response increased substantially as the sensor porosity increased from 46%-50%. Activation energies calculated based on data from the impedance measurements increased in magnitude (97.4-104.9 kJ/mol for 100 ppm NO) with respect to increasing YSZ porosity. Analysis of the oxygen partial pressure dependence of the sensors suggested that dissociative adsorption was the dominant rate limiting...
2013: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/17188563/synthesis-and-characterization-of-n-n-bis-2-hydroxyethyl-1-4-6-8-naphthalenediimide-with-para-substituted-of-phenols-based-on-charge-transfer-complexes
#3
Moamen S Refat, Hamada M A Killa, Ivo Grabchev, Mohamed Y El-Sayed
The interaction of charge-transfer (CT) complexes resulted from the reaction of N,N'-bis[2-hydroxyethyl]-1,4,6,8-naphthalenediimide (BHENDI) with some various acceptors like as substituted phenols in para position; 4-aminophenol (4AP), 4-methylphenol (4MP) and 4-nitrophenol (4NP) have been studied in methanol at room temperature. The reaction was studied using electronic (UV-vis), mid infrared, and (1)H NMR spectra and thermal measurements (TGA and DTG) as well as elemental analysis CHN. The chemical analysis data of the resulted CT-complexes, BHENDI-acceptors, reveal that the formation of a 1:2 CT complexes in all cases...
September 2007: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/3239799/determination-of-selenols-diselenides-and-selenenyl-sulfides-by-reversed-phase-liquid-chromatography-with-electrochemical-detection
#4
H M Killa, D L Rabenstein
No abstract text is available yet for this article.
October 15, 1988: Analytical Chemistry
https://www.readbyqxmd.com/read/2745604/separation-and-detection-of-bis-alkylthio-selenides-of-penicillamine-and-glutathione-by-liquid-chromatography-with-electrochemical-detection
#5
H M Killa, D L Rabenstein
Sensitive and selective methodology is described for the simultaneous determination of thiols, disulfides and bis(alkylthio)selenides in mixtures formed by reaction of selenious acid with thiols. The methods are based on separation of the various compounds by reversed-phase ion pairing chromatography followed by detection with an electrochemical detector equipped with dual mercury/gold amalgam electrodes in series in the eluent stream. Thiols are detected directly at the downstream electrode. Bis(alkylthio)selenides and disulfides are detected indirectly by first reducing them at the upstream electrode followed by detection of the reduction products at the downstream electrode...
March 31, 1989: Journal of Chromatography
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