We report the far-infrared properties of the organic crystal DAST, a popular terahertz emitter, from 0.6-12 THz through use of a THz spectrometer incorporating air-plasma THz generation and electro-optic (EO) sampling in a poled EO polymer. We identify absorption features at 1.1, 3.1, 5.2, 7.1, 8.4, 11, and 12.3 THz and at 1.1, 1.3, 1.6, 2.2, 3, 5.2, 7.2, 9.6 and 11.7 THz for a-axis and b-axis ...

The first known demonstration of tunable terahertz-wave generation by difference-frequency generation of dual signal-wave quasi-phase-matched optical parametric oscillation was performed with periodically poled LiNbO(3) (PPLN) with a series of gratings. An organic ionic salt, 4-dimethylamino-N-methyl-4-stilbazolium-tosylate (DAST), was used as a nonlinear crystal. A compact terahertz-wave sourc...

A general approach to enantiopure conformationally constrained sugar derived α/β- and α/γ-peptides has been established. Five-membered ring α/β-peptides were synthesized via formyl C-glycofuranosides, easy available from hexose-derived azido-2-equatorial-OH-glycopyranosides by DAST-promoted ring contraction. By means of a regioselective oxidation with TEMPO at C-6 of hexose-derived 3-azido glyc...

BACKGROUND Brief interventions such as Screening, a single session of Brief Intervention, and Referral to Treatment (SBIRT) have shown mixed effectiveness in primary care. However, there are indications that multi-session brief interventions may demonstrate more consistently positive outcomes, and perhaps a more intensive approach would be of benefit in addressing substance use in primary care....

ABSTRACT Bloodstream infections (BSI) are associated with high mortality rates, especially in immunocompromised patients. Identifying pathogens early and selecting appropriate antimicrobials to treat BSI is integral reducing the rate. There a need reduce turnaround time (TAT) of pathogen identification as well accelerate antimicrobial susceptibility testing (AST) blood cultures, which can be ac...

Este artículo explora las formas en que se representa a China Chile través de un caso estudio: 71 estudiantes posgrado negocios, entre 2018 y 2022. A partir una adaptación la metodología DAST, les pidió los participantes dibujaran China, sin más instrucciones, lo permitió identificar principales representaciones sobre ese país chilenos negocios. Los resultados muestran representan desde dimensi...

We report the full characterization of a new organic nonlinear optical (NLO) crystal for intense THz generation: PNPA ((E)-4-((4-nitrobenzylidene)amino)-N-phenylaniline). discuss growth and structural characteristics. present wavelength dependence generation, thickness spectrum crystals, measure efficiency. enables generation that surpasses NLO crystals DAST OH-1, which have been standard in hi...