the potassium pools of five major physiographic units of urmia region in western azarbaijan province were studied to investigate the distribution of k forms as a function of clay mineralogy and physiographic units. for this, soil samples from different horizons of ten pedons were selected and analyzed for physiochemical properties, mineralogy of clay fraction, and forms of k. analyses of xrd re...

ABSTRACT- The present research was conducted to study K forms and fixation in soils of southern Iran (Hormozgan Province) with aridic and aridic-ustic regimes and to address the relations between soil mineralogy and potassium forms. Thirteen surface soil samples (0-25 cm) were collected from different regions and analyzed in laboratory. Illite and feldspar and mica are the major clay and soil m...

abstract- greenhouse experiment was conducted in factorial experiment arranged as a completely randomized design (crd) to evaluate the effect of glomus intraradices, pseudomonas fluorescence and soil drying on different forms of potassium (k) and the changes of clay minerals in a calcareous soil after maize planting. treatments consisted of arbuscular mycorrhizal (am) fungus at two levels: g0 (...

Objective: The objective of this study is to develop and validate new selective kinetic methods for the determination of Gentamicin in pure and pharmaceutical preparations. Methods: The proposed methods (A and B) are based on the oxidation of Gentamicin drug with alkaline potassium permanganate at fixed temperature. The oxidation reaction was followed spectrophotometrically by measuring the inc...

Two simple and sensitive kinetic methods were developed for the determination of ribavirin in bulk and in its pharmaceutical preparations using alkaline potassium permanganate as an oxidizing agent. The methods are based upon a kinetic investigation of the oxidation reaction of the drug at room temperature for fixed times of 20 and 30 minutes. In the first method, the absorbance of the colored ...

A simple and sensitive kinetic spectrophotometric method was established for the determination of acarbose and miglitol in bulk and in their pharmaceutical preparations using alkaline potassium permanganate as an oxidizing agent. The method involves determination of acarbose and miglitol by kinetic studies of their oxidation at room temperature for a fixed time of 15 minutes for acarbose and 25...

A new simple and sensitive kinetic spectrophotometric method for the determination of silymarin in pure form and in pharmaceutical formulations is described. The method is based on the oxidation of the drug with potassium permanganate at pH 7.0 +/- 0.2. The reaction is followed spectrophotometrically by measuring the decrease in the absorbance at 530 nm. The calibration graph is linear in the r...

Abstract Potassium fertilization can change K forms available in the soil, as well influence plant absorption of it and yield but, mainly, affect grape composition. The aim current study was to investigate impact potassium (K) on production juice (must) composition a Cabernet Sauvignon cultivar. Grapevines were treated with 0, 50, 100, 150 200 kg ha-1 year-1 K2O. Leaf contents, per area, total ...

Regulation of intracellular and extracellular potassium concentration is a fundamental process vital for cellular metabolism. Potassium intake, from the diet, is carefully balanced with excretion of potassium via the renal tract and gastrointestinal losses. Following a potassium load, extra-renal buffering of potassium occurs in peripheral tissues prior to its excretion. Thus potassium regulati...