The zyxwvutsrqponmlkjihgfedcbaZYXWVUTSR… determination of urea in serum and in
urine is a very important routine test widely used in many clinical laboratories. These …

Integral part of an ammonia gas membrane electrode. At least 200, and possibly 1000,
assays can be made with one electrode over the range 5 X 10~ 5-10~ 2 M with a CV of …

A dedicated instrument for the quantitative determination of urea in blood serum or plasma
has been developed. The instrument uses urease immobilized on a porous alumina support …

I propose a single, quick method for measuring ammonia in urine and urea in plasma and
urine. An ammonia-selective electrodie is used, set up on a microcell, which allows use of …

A urease reactor, gas-liquid separation and a second derivative spectrophotometer are
used. The sample is pumped at 4 ml min− 1 through a reactor containing urease chemically …

Automated and manual direct methods for the determination of urea in blood or serum are
described. These methods determine urea by the colored product formed when urea, in …

A method for the automated determination of urea in plasma and urine, using urease and
alkaline phenol, proved to have the advantages of speed and precision when compared …

An immobilized urease reactor can be used with ion chromatography for the simultaneous
determination of urea, and sodium, potassium and ammonium ions. The conversion of urea …

In this method for serum and urinary urea determination, the same reagent is used without
predilution of urine samples. The method is based on the pH increase resulting from the …

We want to describe the use of urease immobilised on the interior surface of a nylon coil for
the estimation of plasma urea. The method described is a modification of that of Filippusson …