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Most active are the catalysts prepared by impregnation of alumina with an aqueous solution of uranyl nitrate.
Ultrathin sections (~70 nm thick) of the selected areas were cut with the same ultramicrotome using a diamond knife and stained with an alcoholic solution of uranyl acetate, followed by an alkaline bismuth subnitrate solution.
Ultrathin gold sections were cut on a Reichert-Jung ultramicrotome, collected on formvar-coated grids, stained with saturated solution of uranyl acetate in 100% methanol, and post-stained with lead citrate.
The slices were contrasted with aqueous solution of uranyl acetate and lead citrate and examined on JEM-1400 Transmission Electron Microscope (JEOL Ltd ,Japan) with accelerating voltage of 80 kV.
Ultra-thin sections (∼80 nm thick) were stained with a saturated solution of uranyl acetate and 0.17% lead citrate in 0.1 N sodium hydroxide.
Grids were then washed consecutively with TBG, TBS, and distilled water (5 min each) before staining with a saturated solution of uranyl acetate followed by lead citrate.
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A simple but accurate method has been developed for the determination of carbon in uranium carbide powders/pellets as well as in solutions of uranyl nitrates.
Spectra of solutions of uranyl nitrate and sodium molybdate at various pH were taken before spectra of uranyl-catechol and catechol-molybdate to distinguish effects of complexation from the effect of pH change.
The specimen was thin-sectioned and the ultrathin sections were stained in an aqueous solutions of uranyl acetate followed by lead citrate and examined under a JEOL GEM 1010 transmission electron microscope (TEM).
Trapezoidal ultrathin sections of 70 80 nm thickness were obtained from 3 seminiferous tubules of 4 blocks from each group with glass knives using a Bromma 8800 ULTRATOME III (LKB, Sweden) and contrasted next with solutions of uranyl acetate (15 min) and lead citrate (8 min).
The addition of Ca2+ to aqueous solutions of uranyl-carbonates has a dramatic effect on increasing their stability and decreasing reactivity [49, 82 84].
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