in this work, we report synthesis and characterization of copper nanoparticles in polymer matrix by wet-chemical reduction method using ascorbic acid as reducing agent, copper (ii) sulfate as metal precursor and polyvinylpyrrolidone k-30 (pvp k-30) as surfactant agent. the reaction was carried out in a high-speed stirring mixture at room temperature under nitrogen atmosphere. characterization o...

A dissolution test for telithromycin tablets was validated and developed. In order to choose the most discriminatory one, the conditions to carry out are 900 mL of sodium phosphate buffer at pH 7.5, paddles at 50 rpm stirring speed, time test set to 60 min and using USP apparatus 2 with paddles. The UV spectrophotometric method for determination of telithromycin released was developed and valid...

This research work investigates the efficiency of H3PO4and KOH impregnated jackfruit leaf powder based carbon as adsorbent to remove Ni from wastewater. The removal characteristics of Nickel using both the adsorbents were investigated under various operating variables like contact time, adsorbent dosage, initial metal concentration, solution pH, temperature and stirring speed. The results showe...

Constructive effects of noise in spatially extended systems have been well studied in static reaction-diffusion media. We study a noisy two-dimensional Fitz Hugh-Nagumo excitable model under the stirring of a chaotic flow. We find a regime where a noisy excitation can induce a coherent global excitation of the medium and a noise-sustained oscillation. Outside this regime, noisy excitation is ei...

This research work investigates the application of KOH impregnated jackfruit leaf powder to remove Nickel from wastewater. The removal characteristics of Nickel from wastewater was investigated under various operating variables like contact time, adsorbent dosage, initial metal concentration, solution pH, temperature and stirring speed. The results showed that the KOH impregnated jackfruit leaf...

components: Lexein (1 5 g), Difco malt extract (10 g), Cerelose (10g), soybean meal (10g), and lactose (15g) per liter of tap water; the pH was adjusted to 7.2 with 6 n NaOHprior to sterilization. Fermentations were conducted in NewBrunswick 14-liter fermenters containing 10 liters of mediumat 28°C, 250 rpm stirring speed and 2 liters/minute aeration rate, with foaming controlled by triggered a...

A new concept for spinning unmagnetized plasma is demonstrated experimentally. Plasma is confined by an axisymmetric multicusp magnetic field and biased cathodes are used to drive currents and impart a torque in the magnetized edge. Measurements show that flow viscously couples momentum from the magnetized edge (where the plasma viscosity is small) into the unmagnetized core (where the viscosit...

Substances to be purified by dialysis are placed in collodion bags together with a toy "marble" or a bubble of air. The bags are stoppered and placed in glass tubes of a rocking machine. Distilled water of the desired temperature is circulated through the tubes (around the bags) at a rate of about 8 cc. per minute per bag while the machine is in motion. The rolling of the marbles or bubbles cau...

A simple manual micro-titration method is proposed for the potentiometric and conductometric titration of 200 to 800 µL liquid samples. The sample be titrated dispensed into chamber; bottom section a plastic test tube that glued center small stirring magnet. After inserting sensing probe tip titrant delivery chamber, chamber-stirring magnet assembly spun at low speed using conventional magnetic...

The effect of the application forced convection during continuous solidification Al-Si alloys has been presented in this work. investigation made on hypothesis that as an alloy solidifies under action a rotating magnetic field, nondendritic casting structure would be obtained. studied its three different states (original, modified, and modified with grain refiner), using stirring equipment perm...