Skip Navigation LinksVolume : Volume 2 No.1 1992

  
  
  
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utilization_of_some_agrowastes_for_alcohol_production.pdfUTILIZATION OF SOME AGROWASTES FOR ALCOHOL PRODUCTION
  
ABSTRACT:
Saccharomyces cerevisiae var. ellipsoideus and Kluyveromyces fragilis produced 59.8 and 69.0 g/l ethanol respectively when grown in cocoa waste at 30°C by continuous fermentation. Maximum ethanol production by the species was achieved at cell biomass concentrations of 2.7 g/l and 2.9 g/l respectively. S.cerevisiae (wild strain) grown under similar conditions in pineapple juice produced 70.0 g/l of ethanol at a cell biomass concentration of 3.9 g/l

AUTHOR:
Othman Abdul Samah, Abdul Rashid Abdul Rahman and Mohd Ismail Abdul Karim

KEYWORDS : Micro-organisms, utilization, agrowastes, biofuel production.
Year: 1992
the_effect_of_on-_off_control_strategies_on_ride_dynamics.pdfTHE EFFECT OF 'ON/OFF' CONTROL STRATEGIES ON RIDE DYNAMICS
  
ABSTRACT:
A quater car model is  used to study the effect of 'ON/OFF'  control strategies on ride dynamics.  The strategies are applied to the damper in  order to drive a semi-active suspension system. Comparisons are made between the passive and semi-active system. Maximum relative displacement and maximum jerk experienced by the sprung mass are recorded  during the simulations.

AUTHOR:
Mohd. Jailani Mohd. Nor

KEYWORDS :  Semi-active, suspension,  jerk,  damping,  displacement, velocity,
acceleration, automobile, comfort.
Year: 1992
production_of_cellulase_enzymes_by_aspergillus_terreus_imi_282743_in_air-lift_fermentor_system.pdfPRODUCTION OF CELLULASE EN2YMES BY ASPERGILLUS TERREUS IMI 282743 IN AIR-LIFT FERMENTOR SYSTEM
  
ABSTRACT:
Aspergillus terreus IMI 282743 was found to produce high activities of extracellular cellulases when grown in 20 litre and 100 litre fermentors. The activities are comparable to that reported by the commercially available Trichoderma reesei, wild type strain. The organism showed tendency for pellet-type growth which is favourable for  air-lift fermentor  operation. Maximum activities of exoglucanase,  0.69 U/ml; endoglucanase, 5.70 U/ml;  and ß-glucosidase, 0.80 U ml:1; were obtained after 5 days of growth in  0.5% cellulose at 33°C with pH controlled at 4.5. The corresponding productivities for the enzymes were 6.31, 66. 70 and 8.40 U/l/h. A high growth yield of the  organism was observed at 0.176 g protein per g cellulose.  At a cellulose concentration of 1.0%, ß-glucosidase activity increased  by 400% while the exo- and endoglucanase activities remained relatively unchanged.  The enzyme composition profile can be modified by changing the substrate concentration,  pH and temperature of fermentation.

AUTHOR:
Zainal Abidin Mohd Yusof

KEYWORDS :  Aspergil/us terreus, extracellular cellulase, high ß-glucosidase, enzyme composition profile.
Year: 1992
development_of_zeolite_nay_from_rice_husk_ash_0.pdfDEVELOPMENT OF ZEOLITE NaY FROM RICE HUSK ASH
  
ABSTRACT:
The silica source for the synthesis of zeolite NaY was extracted from rice husk ash in  the form  of waterglass. The different degrees and techniques of neutralization of the waterglass, followed by various post treatments of the precipitated hydrogel, affected the zeolite formation.  Failure of the zeolitization process was attributed to the state of the silica particles and the high water content in the hydrogels. Zeolite NaY was successfully produced from the precipitated silica which was dried and used in its powdered form, and also from "well-drained" hydrogels.  The time taken for the synthesis was also investigated. Characterization and quantitative analyses were determined solely by the X-ray diffraction technique.  Rice husk ash was found to be a suitable silica source.

AUTHOR:
S.S. Chen and A.K. Yeoh

KEYWORDS: Zeolite NaY, faujasite, silica, rice husk ash (AHA), waterglass, sodium silicate, hydrothermal synthesis, gel formation, XRD.
Year: 1992
development_of_zeolite_nay_from_rice_husk_ash.pdf
  
Year: 1992