COBBER (ClOud OBservER), is a mid-infrared sky monitor featuring a 10μm Perkin-Elmer TPS534 thermopile detector. Radiation is focussed on to the detector through an anti-reflection coated, hemispherical ZnSe lens, providing a 30◦ field of view on the sky. At 10cm in length and 4cm diameter, the tiny cloud monitor was designed for ease of transportation and an extremely low power budget. Run in ...

A simple, rapid isocratic liquid chromatographic procedure with ultraviolet and fluorimetric detection is described for the separation and quantification of L-tryptophan (Trp) and six of its kynurenine metabolites (kynurenine, 3-hydroxykynurenine, and 3-hydroxyanthranilic, kynurenic, xanthurenic and anthranilic acids). Using the Perkin Elmer LC 200 system, a reverse phase Synergi 4 μ fusion-RP8...

Coumarins and their derivatives are important classes of heterocyclic compounds whose synthesis has been the focus of attention of many organic and medicinal chemists. Such an interest in these compounds can be attributed to their variety of bioactivities such as, inhibition of platelet aggregation [1], antibacterial [2], anticancer [3], inhibitor of steroid 5αreductase [4] and inhibitor of HIV...

MATERIALS Reagents AmpliTaq polymerase (Perkin Elmer) Bovine serum albumin (BSA) (nuclease-free; Boehringer Mannheim; stock 1.6 mg/ml) Dimethyl sulfoxide (DMSO) (Aldrich) DNA in ES PCR Lysis buffer (include positive and negative controls) dNTPs (Pharmacia; stock of the mix 10 mM) ES colonies in G418 selection (see Electroporating DNA into Embryonic Stem (ES) Cells and Selection) Light mineral o...

The title compound, C19H15NO3, was synthesized by a Perkin reaction of 2-methyl-8-hy-droxy-quinoline and 4-formyl-2-methyl-benzoate in acetic anhydride under a nitro-gen atmosphere. The mol-ecule has an E conformation about the C=C bond, and the quinoline ring system and the benzene ring are inclined to one another by 29.22 (7)°. There is an intra-molecular O-H⋯N hydrogen bond in the 8-hy-droxy...

This study focused on the mechanical and morphological properties of lignocellulosic heritage textiles (cotton hemp) made using eco-friendly salvia thyme microencapsulated essential oils, characterized by low toxicity for humans environment. A evaluation tested fabrics was performed scanning electron microscopy. The ATR–FTIR spectra untreated treated fabric samples were Perkin Elmer, Spectrum 3...

Critical analysis of published works shows that there is no evidence any Diel- Alder reactions took place in a synchronous manner. The Diel-Alder 4+2 cyclo addition conjugated dienes and dinophiles which represents some mechanistic surprises endo exo products/isomers. Kinetically, product more preffered to isomer because its low activation energy. Therefore this experiment carried out support e...