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Statistical optimization of physical process[taliem.ir]

Statistical optimization of physical process variables for bio-plastic (PHB) production by Alcaligenes sp

In the present study, efforts have been made to optimize the three physical processvariables viz; pH, temperature and agitation speed for enhanced polyhydroxybutyrate (PHB) production in batch cultivation by Alcaligenes sp. which serves as precursor for bioplastic (PHB) production. Strain election was done by viable staining method using nile blue A dye. Agro-industrial by products; ane molasses and urea were used as carbon and nitrogen source for PHB production. Optimization of physical process variables was done by central composite rotatable design (CCRD) using design expert (DX 8.0.6) software.Shake flask cultivation performed under optimum physical ondition viz; 34.5 C temperature, 6.54 pH and agitation speed of 3.13 Hz, gave PHB mass fraction yield of 76.80% ondry molasses substrate and showed 98.0% resemblance with the predicted percentage yield of 77.78%. Batch cultivation further performed in 7.5 L lab scale bioreactor (working volume: 5.6 L) under optimized condition gave maximum cell biomass of 11  0.5 g L1 with a PHB content of 8.8  0.4 g L1 after 48.0 h of fermentation. Scale up study on bioreactor gave maximum PHB yield (YP/x) and productivity of 0.78 and 0.19 g L1 h, which are higher than previous reports under similar condition. Characterization of PHB wasdone by FTIR.
Characterization of Nanocrystals Using[taliem.ir]

Characterization of Nanocrystals Using Spectroscopic Ellipsometry

First applications of ellipsometry to the measurement of poly- and nanocrystalline thin films date back to many decades. The most significant step towards the ellipsometric investigation of composite thin films was the realization of the first spectroscopic ellipsometers in the ’70s , which allowed the measurement of the dielectric function, the imaginary part of which is directly related to the joint density of electronics states sensitively depending upon the changes of the crystal structure. The first models were based on the effective medium approach using constituents of known dielectric functions , whereas the volume fraction of the components can be related to the crystal properties of the thin films. This approach is popular ever since, based on its robustness.