Gallium nitride crystals with definite faces have been fabricated by d.c. arc discharge using gallium and Hz + NH, as starting materials. Transmission electron microscope, selected area diffraction and X-ray diffraction investigation of the as-grown GaN Srystals show thtt the well faceted crystals are single crystalline GaN having a wnrtzite structure with lattice constants a, = 3.18 A and cu =...

The purpose of this study was to use energy dispersive x-ray microanalysis to test the following hypotheses: (1) that individual myocytes may exhibit important variation in the severity of alterations in intracellular ionic homeostasis in response to hypoxia and (2) that hypoxic myocytes may accumulate certain elements in quantities sufficient to impair organellar function and structure. A rabb...

This article reviews different methods used to perform quantitative X-ray microanalysis in the electron microscope and also demonstrates the urgency of measuring the fundamental parameters of X-ray generation for the development of accurate standardless quantitative methods. Using ratios of characteristic lines acquired on the same X-ray spectrum, it is shown that the Cliff and Lorimer K ...

Bromine has been added to cis,trans,trans-1,5,9-cyclododecatriene under various reaction conditions. All expected direct addition products have been isolated, and their structures have been determined by microanalysis, NMR and X-ray crystallography. Advanced NMR techniques were used to determine solution conformations of several of the compounds, enabling comparison with the solid-state conform...

Calcium was detected by X-ray microanalysis in the mitochondria of electrically stimulated nerve endings. The phenomenon described here offers a simple means for identifying the stimulated nerve endings in the electron microscope and appears to be a promising new method for following spontaneous and drug-stimulated translocation of calcium in relation to the regulation of neurotransmitter release.

copper oxide nanostructures have been successfully synthesized via one-step solid-state thermolysis of two metal-organic frameworks, [cu3(btc)2] (1) and [cu(tpa).(dmf)] (2), (btc = benzene-1,3,5-tricarboxylate, tpa = therephtalic acid = 1,4-benzendicarboxylic acid and dmf = dimethyl formamide) under air atmosphere at 400,  500, and 600°c. it has also been found that the reaction temperature pla...