HEMATOXYLIN, WHICH STRUCTURE IS SHOWN BELOW, IS AN IMPORTANT BIOACTIVE FLAVONOID COMPOUND AND IS PRESENT IN PLANTS [1]. IN THE PAST, HEMATOXYLIN WAS REQUIRED FOR USE IN SURGERY AS A BACTERIAL STAIN. IN MODERN DAYS, HEMATOXYLIN HAS BEEN DEVELOPED AS AN IMPORTANT AGENT IN THE HISTOPATHOLOGICAL DIAGNOSIS OF PROSTATE CANCER [1]. THERE ARE TWO CATECHOL RINGS, RINGS A AND B, IN THE CHEMICAL STRUCTURE OF HEMATOXYLIN:…

CHLOROGENIC ACID (5-O-CAFFEOYLQUINIC ACID) IS PREDOMINANT INPLANTS, FRUITS AND VEGETABLES SUCH AS COFFEE BEANS, APPLES, PEARS, TOMATOES, BLUEBERRIES, POTATOES, PEANUTS AND EGGPLANTS [1].IT WAS FOUND TO HAVE ANTIBACTERIAL ACTIVITY BY INCREASING THE MEMBRANE PERMEABILITY, RESULTING IN THE LOSS OF THE BARRIER FUNCTION [2].IN THIS WORK, THE ELECTROCHEMICAL BEHAVIOR OF CGA, WAS STUDIED USING CYCLIC VOLTAMMETRY, CHRONOAMPEROMETRY AND CONTROLLED POTENTIAL COULOMETRY. THE EFFECTS OF DIFFERENT PARAMETERS SUCH AS PH, CGA CONCENTRATION, TIME WINDOW OF THE CHOSEN ELECTROCHEMICAL METHOD, AND TEMPERATURE ON THE ELECTROCHEMICAL BEHAVIOR OF CGA HAVE BEEN STUDIED FOR UNDERSTANDING THE OXIDATION MECHANISM OF THIS COMPOUND. THE RESULTS INDICATED THAT THE PROCESS OF ELECTRO OXIDATION OF CGA FOLLOWS AN ECE MECHANISM. THE ELECTROCHEMICAL BEHAVIOR OF CGA IS STRONGLY DEPENDED ON SOLUTION PH. THE PH DEPENDENCE OF THE REDOX ACTIVITY OF CGA IN AQUEOUS SOLUTION AT A TEMPERATURE RANGE 15-40OC WAS USED FOR THE EXPERIMENTAL DETERMINATION OF THE STANDARD POTENTIALS OF BOTH THE ONE-PROTON-TWO-ELECTRON (0.37 V) AND TWO-PROTON-TWO-ELECTRON (0.54 V) REDOX PROCESSES. THE DIFFUSION COEFFICIENT OF CGA WAS CALCULATED AS 6.97´10-7 CM2 S-1 FOR THE EXPERIMENTAL CONDITIONS, USING CHRONOAMPEROMETRIC RESULTS.

IN THIS PROJECT ONE GROUP OF NANOSIZED SPINEL-TYPE OXIDES CONTAIN ARE PREPARED FROM NITRATES OF THE CONSTITUENT METAL ION, CITRIC ACID (CA), USING A SOL-GEL METHOD. A SERIES OF COMMON ANALYTICAL TECHNIQUES ARE USED TO CHARACTERIZE THE CRYSTALLINITY, MORPHOLOGY, SPECIFIC SURFACE AREA, AND GRAIN SIZE OF THE NANOPOWDERS. THERMAL DECOMPOSITION PROCESS OF THE COMPLEX PRECURSOR IS EXAMINED BY MEANS OF DIFFERENTIAL THERMAL ANALYSIS–THERMAL GRAVIMETRIC COMPLETELY FORMED AFTER CALCINATION TREATMENT. THE SURFACE MORPHOLOGY AND COMPOSITION OF THESE NANOPOWDERS ARE ALSO INVESTIGATED USING SCANNING ELECTRON MICROSCOPY (SEM) AND ENERGY DISPERSIVE X-RAY SPECTROMETER (EDX). THE FOURIER TRANSFORM INFRARED (FTIR) SPECTRA AND THE ULTRAVIOLET-VISIBLE (UV-VIS) SPECTRA ARE ALSO MEASURED FOR STUDYING OF STRUCTURE OF PREPARED NANOPOWDERS. THE NANOPARTICLES SHOWED THE EXCELLENT ADSORPTION PROPERTIES TOWARDS PHOSPHATE. THE ADSORPTION STUDIES HAVE BEEN CARRIED OUT AT DIFFERENT PH VALUES, INITIAL DAY CONCENTRATION AND ADSORBENT DOSES TO THE OPTIMUM CONDITIONS.THE REMOVAL OF PHOSPHATE 98% WAS ACHIEVED. THE KINETIC STUDIES INDICATE THAT THE REMOVAL PROCESS OBEYS THE SECOND-ORDER KINETIC EQUATION ALSO, THE EXPERIMENTAL ISOTHERMS WERE ANALYSED WITH FOUR PARAMETERSE QUATIONS USING LINEAR REGRESSION. MOREOVER, THE ABILITY OF SPINEL NANOPARTICLES TO REMOVE NVIROMENTAL POLLUTANT FROM AQUEOUS SOLUTIONS IS ASSESSED. THE ADSORPTION STUDIES ARE CARRIED OUT AT DIFFERENT PH VALUES, DIFFERENT ADSORBATE CONCENTRATIONS, VARIOUS ADSORBENT DOSAGES, DIFFERENT TEMPERATURE, AND CONTACT TIME IN A BATCH EXPERIMENTS TO FIND THE OPTIMUM CONDITIONS.

FENTANYL IS A MEMBER OF THE CLASS OF DRUGS KNOWN AS FENTANYLS, RAPID-ACTING OPIOID DRUGS THAT ALLEVIATE PAIN WITHOUT CAUSING LOSS OF CONSCIOUSNESS. IN THIS RESEARCH, WE HAVE INVESTIGATED THE ELECTROCHEMICAL OXIDATION OF FENTANYL USING CYCLIC VOLTAMMETRY AND DIFFERENTIAL PULSE VOLTAMMETRY...

THE SOLUBILITY OF METHANE, ETHANE AND PROPANE IN AQUEOUS MIXTURES CONTAINING (1.00 TO 3.00) MOL/L N-METHYLDIETHANOLAMINE (MDEA) WAS MEASURED AT TEMPERATURES (298.2, 313.2, AND 343.2) K AND PRESSURES UP TO 4.00 MPA. THE DATA WERE INCORPORATED INTO A THERMODYNAMIC MODEL, WHICH USES A FORM OF HENRY’S LAW FOR THE AQUEOUS PHASE AND AN EQUATION OF STATE FOR THE NON-AQUEOUS PHASE. THE SOLUBILITY OF THE HYDROCARBONS IN THE AQUEOUS SOLUTIONS HAS BEEN CORRELATED BY A GENERALIZED SETCHENOW EQUATION. ...

This study examines removal of lead from an aqueous medium using rice husk, sawdust and sunflower stem. First, the absorbents were prepared and then sieve nos. 30 and 40; particles with a mean size of 500 microns were obtained from each. The Pb (II) solution was prepared with a concentration of 25 mg/liter and absorption tests were conducted. The findings showed that the equilibrium time for rice tusk was 90 min. and for each of the other two absorbents it was 120 min. an optimal absorption pH of 6 hours was obtained for each absorbent. The tests also showed that with reduction in the concentration of the input lead, from 80 to 1mg/liter, the absorption efficiency for each absorbent increased so that the absorption efficiencies for different absorbents converged. Absorption efficiency increase with mass, too. Isothermal absorption tests showed that the Tompkins model had a better fitness than the Langmuir and Freunlich models.

DURING RECENT DECADES MANY RESEARCHES HAD BEEN DONE IN NANO MATERIAL FIELD. AMONG THIS, CARBON NANOTUBES (CNTS) DUE TO THEIR UNIQUE MECHANICAL, CHEMICAL AND PHYSICAL PROPERTIES, HIGH L/D RATIO, HIGH ACCESSIBLE SURFACE AREA, AND HIGH SORPTION CAPACITY BECOME MORE ATTRACTIVE. IN THIS PAPER CU2+ IONS SEPARATION STUDIED THROUGH NANOPOROUS CARBON MEMBRANE WHICH SYNTHESIS FROM MULTIWALLED CARBON NANOTUBE COATED ON STAINLESS STEEL. FOR GOOD SEPARATION, CNTS WERE FUNCTIONALIZED BY ACID TREATMENT AND WELL DISPERSED CNT SOLUTION WERE COATED ON STEEL SUPPORT, THE PREPARED MEMBRANE USED TO REMOVE CU2+ IONS. THE EFFECT OF PH AND HEAVY METAL IONS ALSO ARE INVESTIGATED.