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Articles by M.S. Brooks
Total Records ( 3 ) for M.S. Brooks
  M.S. Brooks , N.H. Abou El-Hana and A.E. Ghaly
  The drying behavior of plum tomatoes as affected by drying temperature and tomato pieces geometry was investigated. The tomato was cut into halves, quarters and eighths and dried at temperatures of 55 and 65°C. During drying, the moisture content followed an exponential decay curve with R2>0.98. The time required to achieve the critical moisture content for storage (15%) for the tomato halves, quarters and eights were 36, 26 and 20 h and 23, 18 and 13 h, at the temperatures of 55 and 65°C, respectively. The rate of drying also followed exponential decay and was unaffected by the temperature and tomato piece geometries. The specific drying rate was dependent on the drying temperature and was not affected by geometry. The total surface area appeared to have a significant effect on the specific moisture loss than the cut surface area. Cutting the tomato samples into smaller pieces and drying at lower temperatures is recommended to reduce the drying time and maintain quality.
  T. J. Burdock , A. H. Giffin , M.S. Brooks and A.E. Ghaly
  Jadomycins are novel antibiotics that exhibit biological activity against bacteria and yeast and also demonstrate cytotoxicity against cancer cells. Jadomycin C was successfully produced from 10 L of fermentation media in a 19 L bioreactor using Streptomyces venezuelae ISP5230 which was shocked with ethanol. The bioreactor temperature and pH were successfully maintained at 30°C and 7, respectively. The heat of mixing from the agitator was 4.9 J·s-1. The heat of metabolism was 4.4 J·s-1 and the heat provided by the water circulator was 6.2 J·s-1 during the fermentation. A substantial portion of heat (26.45%) was lost with the exhaust air leaving the bioreactor, while 69.03% was lost through the walls and 1.94% and 2.85% were lost through the top and bottom of the bioreactor. Once the bioreactor was inoculated, there was no lag period evident and a specific growth rate of 0.23 h-1 was achieved. The rate of jadomycin production initially increased rapidly and reached a maximum level within 15 hours after the ethanol shock. The dissolved oxygen (DO) concentration during the experiment was inversely related to the growth of the bacteria.
  A. S. Mahmoud , A.E. Ghaly and M.S. Brooks
  The effectiveness of five plant oils (cottonseed, olive, canola sunflower and used cooking oil) for the removal of dye from textile wastewater was evaluated. The study revealed that the dye removal efficiency increased as the temperature was increased. Under low pH, both the oil and dye split into two components each. Neither one of the oil components joined with either one of the dye components. However, the observed reduction in the absorbance under acidic conditions can be attributed to the dye components losing some of their original color or producing different colors that were not effectively measured at 475 nm. When the dye solution was shaken with the oil under alkaline conditions, it formed a colloidal solution containing the oil plus the dye, resulting in a significant dye removal from solution. The results also showed that the optimum conditions for the dye removal for various oils were at a pH of 13 and a temperature of 55 °C, except for canola oil that produced the highest dye removal efficiency at pH of 7. The used cooking oil achieved the highest dye removal efficiency (95.45%) followed by olive oil (87.00%). The other oils (cottonseed, canola and sunflower achieved dye removal efficiencies below 58% and are, therefore, not recommended for dye removal.
 
 
 
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