Diels-alder reaction of 2-chloro-2-nitrosopropane with 1,3-cyclohexadiene

3-(2-Chloropropyl)-2-oxa-3-azabicyclo[2.2.2]oct-5-ene and 2-oxa-3-azabicyclo[2.2.2]oct-5-ene hydrochloride have been prepared by cycloaddition of 2-chloro-2-nitrosopropane to 1,3-cyclohexadiene and their structure determined by nmr, using a ¹H nmr shift reagent.     

A rapid heating and high magnetic field thermal analysis technique

Journal of Thermal Analysis and Calorimetry - A new thermal analysis technique is described that allows measurements to be performed on bulk samples at extreme heating and cooling rates and in high...     

DIELECTRIC LAYERS BCxNy: SYNTHESIS BY THE DECOMPOSITION OF VAPORS OF ORGANOBORON COMPOUNDS,COMPOSITION AND CHEMICAL STRUCTURE

Journal of Structural Chemistry - Composition, chemical structure, and dielectric characteristics of boron carbonitride films BCxNy prepared by chemical vapor deposition upon thermal and plasma...     

Core level spectroscopy and RHEED analysis of KGd(WO4)2 surface

Structural and electronic characterisation of mechanically polished (010) KGd(WO₄)₂ (KGW) has been produced by reflection high-energy electron diffraction (RHEED) and X-ray photoelectron spectroscopy (XPS). With XPS analysis the original element binding energies, chemical composition and valence band structure of KGW have been determined.     

Ultraviolet radiation exposure, vitamin D, and cancer

This paper reviews briefly the evidence for an association between various measures of UV radiation (UVR) exposure and the development of cancer. Issues such as data quality, study design, measurement variation, comparability of studies, and quantification of UV exposure in relation to skin cancer are discussed. A range of exposure, based on skin type, might be appropriate: from 5 min a day three times a week for light-skinned individuals and 10 min a day three times a week for darker-skinned individuals. These exposures translate into 13 h per year, for a light-skinned individual, leading to 650 h of exposure from birth to age 50.     

Lab-on-a-chip sample preparation using laminar fluid diffusion interfaces - computational fluid dynamics model results and fluidic verification experiments

Microfluidic structures for the generation of laminar fluid diffusion interfaces (LFDIs) for sample preparation and analysis are discussed. Experimental data and the results of fluid modeling are shown. LFDIs are generated when two or more streams flow in parallel in a single microfluidic structure without any mixing of the fluids other than by diffusion of particles across the diffusion interface. It has been shown that such structures can be used for diffusion-based separation and detection applications. The method has been applied to DNA desalting, the extraction of small proteins from whole blood samples, and the detection of various constituents in whole blood, among other examples. In this paper the design and manufacture of self-contained microfluidic cartridges for the extraction of small molecules from a mixture of small and large molecules by diffusion is demonstrated. The cards are operated without any external instrumentation, and use hydrostatic pressure as the driving force. The performance of the cartridges is illustrated by separating fluorescein from a mixture of fluorescein and dextran of molecular weight 2 x 10(6). In a single pass, 98.6% of dextran was retained in the product whereas 43.1% of fluorescein was removed. The method is adjustable for different separation requirements, and computational fluid dynamics (CFD) models are shown that demonstrate the tuning of various microfluidic parameters to optimize separation performance. Other applications of LFDIs for establishment of stable concentration gradients, and the exposure of chemical constituents or biological particles to these concentration gradients are shown qualitatively. Microfluidic chips have been designed for high-throughput screening applications that enable the uniform and controlled exposure of cells to lysing agents, thus enabling the differentiation of cells by their sensitivity to specific agents in an on-chip cytometer coupled directly to the lysing structure.     

Phenanthroimidazoles,IV

Syntheses of 1H-phenanthro(9,10-d)imidazoles with naphthyl and thienyl substituents at position 2 are described.

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Phenanthroimidazole, IV. (Kurze Mitteilung)

Zusammenfassung Die Darstellung von drei 1H-Phenanthro(9,10-d)imidazolen mit Naphthylund Thienyl-Substituenten in 2-Stellung wird beschrieben.

     

Synthesen von Chinoxalonderivaten, 2.Mitt.

Zusammenfassung Es wird die Synthese verschiedener Benzo[f]chinoxalone beschrieben.The synthesis of several benzo[f]quinoxalones is described.1. Mitt.:M. Pailer, G. Pruckmayr, H. Zellner undGertraud Zellner, Mh. Chem93, 1005 (1962).     

Phenanthro-imidazole

Zusammenfassung Es wird die Synthese verschiedener Chlor-, Brom- und Nitro-1H-Phenanthro[9,10-d]imidazole beschrieben.

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The synthesis of several chloro-, bromo-, and nitro-1H-Phenathro[9,10-d]imidazoles is described.

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Herrn Professor Dr.F. Wessely zum 70. Geburtstag in Verehrung gewidmet.