Ultra-low threshold polariton lasing at room temperature in a GaN membrane microcavity with a zero-dimensional trap.

Polariton lasers are coherent light sources based on the condensation of exciton-polaritons in semiconductor microcavities, which occurs either in the kinetic or thermodynamic (Bose-Einstein) regime. Besides their fundamental interest, polariton lasers have the potential of extremely low operating thresholds. Here, we demonstrate ultra-low threshold polariton lasing at room temperature, using an all-dielectric, GaN membrane-based microcavity, with a spontaneously-formed zero-dimensional trap.

Highly uniform zinc blende GaAs nanowires on Si(111) using a controlled chemical oxide template.

GaAs-based nanowires (NWs) can be grown without extrinsic catalyst using the Ga-assisted vapor-liquid-solid method in an epitaxy reactor, on Si(111) substrates covered with native oxide. Despite its wide use, the conventional method fails to provide a good control over uniformity, reproducibility, and yield of vertical NWs. The nucleation of GaAs NWs is very sensitive to the properties of the native oxide such as chemical composition, roughness and porosity.

Predictive value of biochemical marker ADAM-12 at first trimester of pregnancy for hypertension and intrauterine growth restriction.

Purpose: Delineate whereas ADAM-12 levels at first trimester of pregnancy may be used as a marker for hypertension-preeclampsia (PE) and intrauterine growth restriction (IUGR).

Materials And Methods: The present is a case control study. Serum ADAM-12 of women presenting for routine assessment of risk for chromosomal abnormalities at 11+0 to 13+6 weeks of gestation was measured.

Strained GaAs/InGaAs Core-Shell Nanowires for Photovoltaic Applications.

We report on the successful growth of strained core-shell GaAs/InGaAs nanowires on Si (111) substrates by molecular beam epitaxy. The as-grown nanowires have a density in the order of 10(8) cm(-2), length between 3 and 3.5 μm, and diameter between 60 and 160 nm, depending on the shell growth duration.

Pre-treatment with probiotics prolongs survival after experimental infection by multidrug-resistant Pseudomonas aeruginosa in rodents: an effect on sepsis-induced immunosuppression.

Based on several randomised clinical studies indicating benefit from oral probiotic intake for the prevention of hospital-acquired infections in critically ill patients, this study aimed to explain the mechanism of action of probiotics for the prevention of lethal experimental infection by multidrug-resistant (MDR) Pseudomonas aeruginosa. Experiments using an Escherichia coli strain susceptible to all antimicrobials were also conducted. C57BL/6 mice were pre-treated intraperitoneally with sterile water for injection or Lactobacillus plantarum.