Unraveling Electron Dynamics in p-type Indium Phosphide (100): A Time-Resolved Two-Photon Photoemission Study.

Renewable ("green") hydrogen production through direct photoelectrochemical (PEC) water splitting is a potential key contributor to the sustainable energy mix of the future. We investigate the potential of indium phosphide (InP) as a reference material among III-V semiconductors for PEC and photovoltaic (PV) applications. The p(2 × 2)/c(4 × 2)-reconstructed phosphorus-terminated p-doped InP(100) (P-rich p-InP) surface is the focus of our investigation.

Reduction in extraction efficiency of charged particles from the ion source as the cause of matrix effects in the GC-MS analysis of drugs.

Previous studies have shown that the ion response of a compound can be suppressed by the presence of a large amount of a coeluting substance in a gas chromatographic-mass spectrometric (GC-MS) system. In the present study, the change in the ion current of a constant amount of diazepam-d5 in the presence of a 100-fold amount of diazepam was used to monitor this condition in the Hewlett Packard mass selective detector (MSD). It was observed that a reduced recovery of ions occurred when the potentials of the MSD source elements were established by the autotune algorithm.

An enzyme-linked immunosorbent assay for urinary screening of fentanyl citrate abuse.

An enzyme-linked immunosorbent assay (ELISA) for quantitation of urinary fentanyl was evaluated as a screening tool for detecting abuse of this potent narcotic. The assay was found to have reproducible calibration curves from 0.5 to 10 ng/mL and a limit of detection of 0.

Definitive identification of an exceptionally high methanol concentration in an intoxication of a surviving infant: methanol metabolism by first-order elimination kinetics.

Intoxication by methanol was identified in a five-week-old infant suffering from moderate metabolic acidosis. The initial serum methanol at admission was 1148 mg/dL as measured by gas chromatography. The osmolal gap and formic acid concentrations were consistent with methanol intoxication.

Characterization of drug interferences caused by coelution of substances in gas chromatography/mass spectrometry confirmation of targeted drugs in full-scan and selected-ion monitoring modes.

Interference by substances coeluting with targeted drugs is a general problem for gas chromatographic/mass spectrometric analysis of urine. To characterize these interferences, we examined human urine samples containing benzoylecgonine and fluconazole, and other drug combinations including deuterated internal standards that coelute (ISd,c) with target drugs, by selected-ion monitoring (SIM) and full-scan mass spectrometry. We show that, by SIM analysis, detecting the presence of an interferent is dependent on the specific IS used for the assay.