a simple, selective and sensitive method for the determination of trace amount of titanium (iv) based on its catalytic effect on methylene blue- ascorbic acid redox reaction has been reported. the reaction was followed spectrophotometrically by measuring the change in absorbance of methylene blue at 665 nm, 5 minutes after the initiation of the reaction. in this study experimental parameters we...

Bismuth oxide nanoparticle was synthesized by Hydrothermal method, with two different molar ratio of precipitating agent NaOH which decided the variations samples (1:5) and (1:6) added to observe its effect on structural, optical photocatalytic behaviour. So prepared bismuth nano particle characterized X-ray Diffractometer study about crystalline properties. The crystal size observed as 30.7 42...

A simple, accurate and fast vortex-assisted dispersive liquid-liquid microextraction procedure has been developed for the extractive spectrophotometric determination of niflumic acid in biological samples. The method is based on the formation of an ion association complex between niflumic acid and methylene blue. The resulting ion-pair was extracted into dichloromethane and its absorbance was m...

A series of new 2-(phenylthio) benzoylaryl hydrazones were synthesized by acid-catalyzed condensation of hydrazide 3 with corresponding aldehydes. The chemical structures of the compounds were elucidated by FT-IR, 1H-NMR and Mass spectra. All newly synthesized compounds were evaluated for their antimycobacterial activities against Mycobacterium tuberculosis H37Rv using the microplate alamar blu...

One of the simplest procedures to demonstrate mucinous substances (acid mucopolysaccharides) in routine histological preparations involves the use of Alcian dyes. Methods involving these dyes have largely. replaced the older, more empirical mucicarmine technique arid are faster and less complicated than the colloidal iron method of Hale,1 which suffers from the possibility of false-positive sta...

INTRODUCTION .................................... 284 Nonspecific Resistance to Infection .......................................... 284 Specific Resistance to Infection .............................................. 285 CELLS INVOLVED IN HUMORAL ANTIBODY PRODUCTION ............. 285 CELLS INVOLVED IN CELL-MEDIATED IMMUNITY ................. 287 HUMORAL ANTIBODIES IN RESISTANCE TO BACTERIAL INF...

A series of new 2-(phenylthio) benzoylaryl hydrazones were synthesized by acid-catalyzed condensation of hydrazide 3 with corresponding aldehydes. The chemical structures of the compounds were elucidated by FT-IR, 1H-NMR and Mass spectra. All newly synthesized compounds were evaluated for their antimycobacterial activities against Mycobacterium tuberculosis H37Rv using the microplate alamar blu...

Recently solution scanometry, as a new, simple, fast, portable, and economic method was introduced for determination of acidity constants of indicator and dyes. In this study, a method was applied for the determination of the acidity constant of p-Rosolic acid (RA) and Bromoxylenol blue (BXB) indicators. The method is based on scanning of Plexiglas® sheet containing colored solutions with a fla...