Three-micron spectrometry in Sharpless - 106

Efficient Polymer-Supported Sharpless Alkene Epoxidation Catalyst*

Homogeneous linear poly(tartrate ester) ligands provide high chemical yields and enantiomeric excesses in the epoxidation of trans-hex-2-en-1-ol using Ti(OPr)4-tert-butyl hydroperoxide. Branched poly(tartrate ester) can be use as heterogeneous ligands in the epoxidation of trans-hex-2-en-1-ol using Ti(OPr)4-tert-butyl hydroperoxide. Removal and recovery of the polymer catalyst is a simple filtr...

Three-micron imaging of the Hubble Deep Field

Images of the Hubble Deep Field at 3.2 μm, taken with the 10-m Keck Telescope, are presented. The images cover a total area of ∼ 2.5 arcmin2. To a 5-sigma limit of [3.2]total ≈ 17.5 mag (Vega-relative), 11 sources are detected, 9 of which are extragalactic. The integrated galaxy number counts are therefore ∼ 1.3 × 104 deg−2 to this depth. The sources detected at 3.2 μm have a median redshift of...

A Three Micron Survey of the Chamaeleon I Dark Cloud

We describe an L-band photometric survey of ∼ 0.5 deg2 of the Cha I dark cloud. The survey has a completeness limit of L < 11.0. Our survey detects 124 sources, including all known pre-main sequence stars with L ≤ 11. The fraction of sources with near-IR excess emission is 58% ± 4% for K = 9–11. Cha I sources have bluer H −K and K − L colors than pre-main sequence stars in Taurus-Auriga. These ...

Isotope ratio analysis on micron-sized particles in complex matrices by Laser Ablation-Absorption Ratio Spectrometry

106 Cem

Correspondence: Cem Yasar Sanhal e-mail: cemsanhal@ yahoo.com Objective. To compare the efficacy of five adhesions barrier products with a control group in a rat model. Methods. In this randomized controlled animal study, standardized lesions on parietal peritoneum of rats were created by sandpaper and three interrupted sutures. Afterwards, the lesions were treated with Seprafilm, Interceed, Pr...