14c-Labelled Material Leached From the Rhizosphere of Plants Supplied with 14co2

Development of a technique for measuring the oxidation rate of a 14C-labelled substrate from 14CO2 production without the need for collection of expired air.

1. A method is proposed for the determination of the rate of oxidation of 14C-labelled substrates in man from blood sampling only. 2. The method was verified by simulating release of 14C into the bicarbonate pool of patients by using a constant-rate infusion of sodium [14C]bicarbonate, the plasma level of total 14CO2 (d.p.m. ml-1 70 kg-1) correlating well (r = 0.878, P = 0.001) with the infusio...

High-efficiency liquid-scintillation counting of 14C-labelled material in aqueous solution and determination of specific activity of labelled proteins.

1. Inexpensive scintillation mixtures are described which enable the detection of as little as 40mumuc of (14)C in aqueous solution with an efficiency of counting of over 80%. 2. A rapid method for the counting of alkaline, acidic and neutral aqueous solutions of up to 1ml. volume is described. Ethanol or 2-ethoxyethanol is used as blending agent. 3. The scintillation counting of alkaline solut...

Role of the rhizosphere in iron nutrition of plants

Metabolism of 14C-labelled alphaxalone in man.

The metabolism of 14C-labelled alphaxalone, dispensed as Althesin, was studied in normal patients, patients with obstructive jaundice and patients with chronic renal disease and anuria. The radioactive label was removed rapidly from the plasma following i.v. administration. The major portion of the label was excreted in the urine. In patients with normal renal function 14C-labelled alphaxalone ...

Determination of 14CO2 in breath and 14C in stool after oral administration of cholyl-1-[14C]glycine: clinical application.

Twenty patients with intestinal bacterial overgrowth and 20 control subjects were investigated for bile acid deconjugation, by measuring 14CO2 in the breath after cholyl-1-[14C]glycine administration. 14CO2 output/24h was 11.0 +/- 5.2% (mean +/- SD) in controls and 54.2 +/- 14.0% (mean +/- SD) in bacterial-overgrowth patients (P less than .001). 14CO2 excretion rate in 12h, when normalized to 1...