Acids microscopic view

Elastic fibres can be easily recognized by their great extensibility and elasticity as well as their longitudinal microscopic view (often quasi-monofil from coalesced single fibrils). As opposed to rare rubber threads, elastane fibres based on polyurethane dissolve in boiling dimethylformamide and swell markedly in 85% formic acid. 

Mercuric Oxide. Mercuric oxide[21908-53-2] HgO, is a red or yellow water-insoluble powder, rhombic in shape when viewed microscopically. The color and shade depend on particle size. The finer particles (< 5 -lm) appear yellow the coarser particles (> 8 -lm) appear redder. The product is soluble in most acids, organic and inorganic, but the yellow form, which has greater surface area, is more reactive and dissolves more readily. Mercuric oxide decomposes at 332°C and has a high (11.1) specific gravity. 

Diatoms and the Scanning Electron Microscope Acid Treatment Method Hydrogen Peroxide Method Obtaining Diatom Specimens from Sediments Preparation of Attached Diatoms Preparing Cleaned Diatoms for Viewing on the Scanning Electron Microscope References... 

The success of the Potts-Guy equation led many authors to advocate a single mechanism as the rate determining step for permeation through the skin barrier for all or at least a wide range of solutes diffusion was assumed to occur primarily via the interkeratinocyte lipids of the stratum corneum, a mixture of ceramides, fatty acids, and sterols. While from a macroscopic point of view these lipids may be modeled as a bulk solvent, on a microscopic scale they... 

The enhancement of kerosene dissolution occurs even at low humic acid content in the aqueous solution. In view of the fact that humic substances are relatively high molecular weight species containing nonpolar organic moieties, Chiou et al. (1986) assumed that a partition-like interaction between a solute of very low solubility in aqueous solution and a microscopic organic environment of dissolved humic molecules can explain solute solubility enhancement. 

A shallow layer of the cuprammonium form resin is placed in the filter crucible connected to a Buchner vacuum filtration assembly. Fhe resin is briefly contacted with a small quantity of 2.5 M (5 N) sulfuric acid which initiates elution of the cuprammonium ion. I he acid is filtered otf and the resin immediately rinsed with excess deionized water to remove all traces of acid. A sample of wetted beads are viewed under a microscope using transmitted light whereupon an inner unreacted blue core is seen to be surrounded by a transparent outer zone. This experiment is also a demonstration of a cation (Cu ) being sorbed emto a resin as a cationic complex with the ion originally present on the resin (NH4 ). 

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