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Abstract  

The influence of micelles, formed by the aggregation of nonionic surfactant molecules, on positronium formation (combination of e and e+) probability is discussed in the light of radiation chemical phenomenon at the end part of the radiation track. The contribution due to the parapositronium/narrow-component intensity in the presence of micellar aggregation and further structural reorganization constitutes important aspects of the ortho-para conversion process.

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Abstract  

Interactions of positronium in aqueous solutions of Co2+ and Cu2+ ions have been investigated at room temperature (297 K) at varying concentrations using both lifetime and Doppler broadening of annihilation radiation techniques. In the case of Co2+, the results indicate spin conversion reaction alone. However, in the case of Cu2+, oxidation is predominant with a small contribution of spin conversion reaction. The corresponding rate constants have been evaluated.

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Abstract  

A solvent extraction procedure for the separation of niobium and tantalum has been developed. The method consists of extracting tantalum from its aqueous mixture with niobium, with the help of di(2-ethylhexyl)phosphoric acid (HDEHP) in n-heptane. The aqueous feed consists of niobium and tantalum in an aqueous medium containing hydrochloric and oxalic acids. The concentrations of niobium and tantalum were raised to 1 mg/ml in the aqueous solution. The extraction efficiency of tantalum under these conditions was found to be 85%. Effects of chloride and oxalate ions as well as those of the concentration of HDEHP on the extraction efficiency were studied and discussed in detail.

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Abstract  

Positron emission tomography (PET) is an imaging modality for medical diagnoses that can determine biochemical and physiological processes in vivo in a quantitative way by using radio-pharmaceuticals labeled with positron emitting radionuclides. This article brings together various aspects of the basic physics, critical design and instrumentation along with the modalities of the application of radiotracers and the radiological protections involved in the processes. A critical discussion on the various aspects of the PET system is also included. Several new advances and scope of future investigations in terms of better sensitivity, local as well as kinetic resolution, specific tracer targeting (including chemical speciation) and better spatial resolution of the PET image are also covered.

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Acta Chromatographica
Authors:
M. Ganesh
,
B. Thangabalan
,
R. Patil
,
D. Thakur
,
A. Kumar Kumar
,
M. Vinoba
,
S. Ganguly
, and
T. Sivakumar

Summary

A rapid, simple and validated reversed-phase high-performance liquid chromatographic method has been developed for analysis of oxaprozin in pharmaceutical dosage forms. Oxaprozin was separated on an ODS analytical column with a 45:55 (v/v) mixture of acetonitrile and triethanolamine solution (5 mm, pH 3.5 ± 0.05, adjusted by addition of 85% phosphoric acid) as mobile phase at a flow rate of 2.0 mL min–1. The effluent was monitored by UV detection at 254 nm. Calibration plots were linear in the range 160 to 240 μg mL–1 and the LOD and LOQ were 14.26 and 41.21 μg mL–1, respectively. The high recovery and low relative standard deviation confirm the suitability of the method for routine QC determination of oxaprozin in tablets.

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