multi-walled carbon nanotubes (mwnt’s) were synthesized using chemical vapor deposition (cvd) method in a fluidized bed reactor under the flow of methane and hydrogen gases. a cobalt-molybdenum/magnesium oxide (co-mo/mgo) nanocatalyst was used as the catalyst of the process. the samples were analyzed using scanning electron microscopy (sem) and x-ray diffraction (xrd) analyses. the effects of d...

Desertomycin was isolated from Streptomyces macronensis Dietz sp. nov. UC 8271. Extensive spectroscopic work led us to place desertomycin in the macrocyclic lactone family which contains monazomycin, scopafungin, primycin, azalomycin F4a and niphithricins A and B. The apparent molecular formula was determined by fast atom bombardment mass spectroscopy to be C57H109NO24 (MW = 1,191). Mild acid h...

We present a fast and effective electrochemical method to purify random networks of single-walled carbon nanotubes (SWCNTs) that leads to total removal of metal catalyst without apparent detrimental effect on the electrochemical properties of the electrodes. The efficiency of the electrochemical purification has been compared with that of conventional chemical purification (acid washing). The d...

Membrane technology is a sustainable process of molecular separation and purification in the chemical pharmaceutical industries, with lower energy consumption than traditional thermal methods.

We have applied the technique of protein release by chemical permeabilization to recover a foreign protein in active form from the periplasm of a recombinant strain of Escherichia coli. The two agents used in our chemical permeabilization scheme, guanidine hydrochloride and Triton X-100, have different modes of action, allowing selectivity in protein release based on intracellular location unde...

Organic solvents are widely used as reaction media and/or for the separation and purification of synthetic products in chemical pharmaceutical industries [...]

Marine diesel engine lubricating oil after long-term use, due to pollution and chemical activity, internal impurities increased, lubrication effect gradually deteriorated. The purification device based on balanced charge agglomeration (BCA) can realize the on-line of oil. In order further improve efficiency, a control system PLC is designed in this paper. consists complex electromechanical inte...

Background and Objectives: Recognizing the impurities of sugar beet and also comparing different methods of juice purification have shown that the chemical purification based on lime and carbon dioxide is really efficient and economic in the sugar industry. Factories have to control and improve purification stages to achieve clear juice with high chemical purity, low color, minimum hardness, su...