Microdetermination of Protein Nitrogen with a Dumbbell Diffusion Apparatus

Microdetermination of protein nitrogen with a dumbbell diffusion apparatus.

The use of a two-chamber, sealed microdiffusion apparatus has been investigated for the determination of protein nitrogen on samples containing 0.5 mg. protein. The apparatus is constructed from a ground-glass ball-and-socket joint, and all operations including digestion are performed in the designed apparatus. The method has been applied to the determination of nitrogen in tobacco mosaic virus...

An apparatus for microdetermination of CO2 in plasma.

The colorimetric microdetermination of urea nitrogen by the xanthydrol method.

Although many methods for the determination of urea nitrogen have been described, few have proved highly convenient for the accurate determination of small amounts of urea nitrogen without having to make use of special apparatus or techniques. Among the older methods, the Van Slyke gasometric method (1) is generally considered the most accurate, with an allowable error of 1 per cent. This metho...

Evaluation of Nitrogen Diffusion in Plasma Nitrided Iron by Various

   Diffusion of nitrogen in plasma nitrided iron and structural evolution during the nitriding process were evaluated by several characterization techniques including optical microscopy (OM), microhardness depth profiling (HDP), scanning electron microscopy (SEM), x-ray diffraction (XRD), glow discharge optical emission spectroscopy (GDOES), and secondary ion mass spectroscopy (SIMS). Plasma ni...

The Microdetermination of Biological Copper with Oxalyldihydrazide.

Methods are described for the determination of microgram quantities of biological copper in aqueous medium as the intensely coloured oxalyldihydrazide-acetaldehyde complex (molar extinction coefficient 23,000 to 23,500). The methods are applicable on a routine basis to any biological material, in particular to serum, urine, or tissues, such as liver, brain, or kidney. In the case of urine a sim...