background nowadays, adsorption techniques are widely used to remove certain classes of pollutants from water. objectives the aim of this study was to remove ametryn from water solutions by natural zeolite nanoparticles from the semnan region of iran. materials and methods for this purpose zeolite nanoparticles were synthesized from natural zeolite using planetary ball-mill. the zeolite nanopar...

direct orthogonal signal correction(dosc) and savitzky-golay filters (sgf) were applied as preprocessing methods on the original and first derivative absorbance data. principle component regression (pcr), partial least squares (pls) and iterative target transformation factor analysis (ittfa), were used in spectrophotometric simultaneous determination of heavy divalent metal ions, lead, zinc,mer...

The cleavage activity of synthetic ribozymes needs to be characterized by reliable and rapid methods. A chromatographic method to simultaneously quantitate the amounts of substrate, cleavage fragments and ribozyme is described. The method allows the rapid normalization of analytical data because the sum of the 260-nm peak areas of remaining substrate and obtained fragments is essentially equal ...

The role of artificially created defects and steps in the local reaction kinetics of CO oxidation on the individual domains of a polycrystalline Pd foil was studied by photoemission electron microscopy (PEEM), mass spectroscopy (MS), and scanning tunneling microscopy (STM). The defects and steps were created by STM-controlled Ar+ sputtering and the novel PEEM-based approach allowed the simultan...

This paper describes a fast kinetic method for the simultaneous determination of unconjugated and conjugated bilirugin in the same reaction solution. A stopped-flow mixing system with a stabilized photometer and small computer is used to mix sample and reagent rapidly and to record 250 data points during a 700-ms reaction time, and a regression program is used to resolve these kinetic data into...

The investigation of the spectral kinetic model Multipole Resonance Probe (MRP) is presented and discussed in this paper. MRP a radio-frequency driven probe particular spherical design, which suitable for supervision control low-temperature plasma. importance effects was introduced previous study idealized MRP. Such particularly dominate energy loss low-pressure regime. Unfortunately, they are ...

paracetamol that is known as acetaminophen have the most consume as an analgesic and antipyreticdrug in the world. that is formulated in single compound or mixture at many forms such astablets, syrups, suspensions and drops. the last form is intravenous injections. paracetamol derivedfrom 4-minophenol which is synthesized by acylated the p-acetaminophenol and acetic anhydride.4-aminophenol is t...

Kinetic modeling is an important issue, whose objective is the accurate determination of the rates of various reactions taking place in a reacting system. This issue is a pivotal element in the process design and development particularly for novel processes which are based on reactions taking place between various types of species. The Fischer Tropsch (FT) reactions have been used as the ki...