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Articles by M. Jusoh
Total Records ( 3 ) for M. Jusoh
  M. Jusoh , R.M. Yunus and M.A. Abu Hassan
  Freeze concentration freezes or crystallizes water component in a solution out as ice crystals and leaves behind a highly concentrated solution. Conventional Suspension Freeze Concentration (SFC) system has to deal with difficult separation of ice formed in a suspension of the mother liquor, which leads to a high cost of operation. Scraped surface heat exchanger used to form seed ice to ensure production of large ice crystals also hiked up the capital cost involved. Progressive Freeze Concentration (PFC) is believed to be able to reduce the capital and operation cost by eliminating some unit operations used. In PFC, ice crystals were formed progressively as a single block of ice, on the surface where cooling is supplied. In this particular study, a new helical structured copper Crystallization Chamber (CC) was designed and fabricated. Three operating parameters which affect the performance of the system were investigated namely the circulation period, circulation flow rate and coolant temperature. Effective partition constant, K was used as an indication of the system efficiency and to assess its performance, calculated from the volume and concentration of the solid and liquid phase. Circulation period was found to produce a constant value of K at each period tested with the CC. It was also discovered that higher flowrate resulted in a lower K, which translated into high efficiency. The efficiency is the highest at 1000 mL min-1. The process also gives the highest efficiency at a coolant temperature of -6°C.
  N. Hisham , H.A. Rahim , F. Malek , M. Jusoh , F.A.A. Fuad and A. Romli
  In this study, the effects of exposure to Radio Frequency Electromagnetic Fields (RF-EMF) on cameraman will be investigated using Electro Encephalo Gram (EEG). There are two hypothesis will be tested which is firstly include the exposure of cameraman to the radio frequency that will affect their brain activity. Second , hypothesis involve the cameraman wearing a RF shielded hat can reduce the effect of exposure to RF-EMF. The 20 healthy cameramen will be involved in this experiment. Well-being and physiological measures of body temperature, blood pressure and heart rate will be obtained. The 2 types of exposure conditions will be conducted (Sham (no exposure) and wireless video-camera exposures). Each exposure will be lasted for 20 min session.
  L.C. Ng , W.A. Ismail and M. Jusoh
  Background and Objective: Roselle (Hibiscus sabdariffa L.) is an important crop used in confectionery, cosmetic and pharmaceutical industries and vascular wilt caused by Fusarium oxysporum is the obstacles in roselle production. Compost has been use to control disease infection in various crops through several suppression mechanisms. However, the bio-efficacy of agro-waste compost in suppression of F. oxysporum in roselle is still unknown. The aim of this study was to evaluate the bio-efficacy of agro-waste compost that would be potential soil suppressive amendment to control F. oxysporum of roselle. Materials and Methods: Three types of agro-waste composts: Vermicompost, crop residue and horse manure compost were used in this study. The direct suppression effects of compost and compost extract on the growth of F. oxysporum were determined. The total microbial population in compost was also evaluated. Results: Generally, the non-sterilized agro-waste compost shown prominent suppressive effects on mycelial growth of F. oxysporum over sterilized compost. Similar results were observed when non-sterilized agro-waste compost extracts at 5, 10, 25 and 50% concentrations were used to suppress the growth of F. oxysporum. Non-sterilized horse manure compost extracts significantly inhibit in vitro mycelial growth of F. oxysporum with 70.84%. The total microbial activity in vermicompost was recorded significantly high with 6.46 μg/mL/0.5 h. However, the total microbial activity in vermicompost was not associated with the suppression effect against F. oxysporum. Conclusion: The suppression activities of compost against F. oxysporum was mainly caused by the biotic factor. However, the total microbial activity in agro-waste compost is not sorely contributed to the suppressive activity against F. oxysporum. The present of the strong antagonist in the non-sterilized agro-waste compost was the key factor to explain the high suppressiveness of the horse manure compost. Whereas, the abiotic factor involved indirectly influent the compost property and the colonization ability of the microorganisms. All composts used have potential to suppress the growth of F. oxysporum, especially the non-sterilized agro-waste composts have higher potential to be developed as soil suppressive amendment against F. oxysporum.
 
 
 
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