Background and Aim: The semantic evolution of a word over time is inevitable, indicating a social, political, religious or cultural process. Nurse is one of the words that has a significant presence in Persian literature texts and has been used in many different meanings such as slave, servan, maid, devotee, obedient, patient and preserver. The purpose of this study is to show its semantic ev...

determination of uranium in natural water and complex solutions using ion exchange chromatography: a combined procedure using ion exchange chromatography and uv-vis spectrophotometry techniques has been developed to measure uranum in natural water and complex solutions. after conditicing , one hundred milli liters of sample solutions have been passed through an ion exchange column,pachked with ...