a kinetic-spectrophotometric procedure is reported for determination of trace amounts of ag(i). this method is based on catalytic effect of silver ion on the oxidation of congo red by potassium peroxodisulphate at ph=3.4 and 30 oc in the presence of 1,10-phenanthroline as an activator. the reaction was followed spectrophotometrically by measuring the rate of change in absorbance of congo red at...

Consider two adolescents: Person One and Person Two. Person One has never used substances and exhibits relatively few behavioral (conduct) problems. On the other hand, Person Two uses substances frequently and more commonly exhibits poor conduct. If you were to guess, which of the individuals would you expect to have lower overall judgment and self-regulation? If you answered Person Two, your i...

sickle cell disease is a genetic haemoglobinopathy with consequent haemolysis and anaemia. it is of interest to study its effect on red cell indices beside haemoglobin concentration.the objective of the study is to determine the values of red cell indices in preschool-age children with sickle cell anaemia.we conducted a cross-sectional study including 97 children with sickle cell anaemia aged s...

The CARTO XP ablation system provides real-time data on 3D, color-coded maps of the electrical activity of the heart; however, it is expensive and can only use a dedicated costly magnetic catheter per patient intervention. The purpose of our study is to shorten the duration of the radiofrequency ablation procedure and increase its efficacy by developing an affordable prototype catheter navigati...

there are reports from different countries that some types of glaucoma are associated with blood groups. this cross-sectional study was performed on 400 glaucomatous patients [100 patients in each group of primary open angle glaucoma (poag), chronic angle closure glaucoma (cacg), pseudoexfoliative glaucoma (pexg) and primary congenital glaucoma (pcg)] and 400 blood donors as control group to as...

a total of 1695 blood samples collected from ten ethnically distinct populations of iran (turks and kurds of rezaieh, lurs, aabolis, baluchis, turks and kurds of shrvan, zoroastrians, tehranis, and kermanis) were examined for six polymorphic red cell enzyme systems, namely red cell acid phosphatase (ap), adenylate kinase (ak), phosphoglucomutase (pgm1), esteraxe d (esd), adenosine deaminase (ad...

this study attempts to investigate the origin of red pigments, time of reddening, and processes responsible for red colouring of the upper miocene age upper red formation, the most important clastic unit in central iran. mineralogical composition and textural properties of the studied sequences show that the upper red formation sequences were not red when deposited, although some parts of red p...