Pusat Pengajian Sains Kajihayat - Tesis

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    Occurrence, Structural Morphology And Genotyping Of Blastocystis From Water Sources In Northern States Of Peninsular Malaysia
    (2025-06)
    Achigili, Attah Okau
    This study aims to determine the occurrence, morphological characteristics, and subtype (ST) distribution of Blastocystis in several selected water sources in Northern Peninsular Malaysia, as well as determine the association of the parasite with physicochemical parameters and faecal coliform counts.
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    Isolation, Identification And Characterization Of Poly(3-Hydroxybutyrate-co-3-Hydroxyhexanoate) [PHBHx] Degrading Bacteria From Soil, Plastisphere, And Brackish Water Samples
    (2025-07)
    Taufiq, Ahmad Syauqi
    This study aimed at isolating potential PHBHx-degrading bacteria from soil, plastisphere and brackish water samples. In this study, a total of 22 PHA-degrading bacteria were screened for their ability to degrade different types of PHA, particularly PHBHx with different 3HHx monomeric compositions, using clear zone assays. Results showed that as the 3HHx monomer composition increased, the number of bacteria capable of degrading the copolymer decreased.
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    Segregation Of Microsatellite Markers, Fertility AND Pathogenicity On Hylocereus undatus (Dragon Fruits) In The Interspecific Hybrid Between Fusarium fujikuroi And Fusarium proliferatum
    (2023-10)
    Mohd Azmurin, Emier
    The main objective of this research is to further characterize the interspecific hybrids. Continuing from the previous research, several progenies have been selected and extend the information regarding those hybrids such as pathogenicity test, fertility test and molecular approach using microsatellite marker.
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    The Efficacy Of Biopesticides, Ipomoea Cairica (L.) Leaf Extracts And Metarhizium Anisopliae (Metsch.) On Resistant Populations Of Aedes Aegypti (L.) And Aedes Albopictus (Skuse) In Urban And Suburban Areas Of Penang Islands, Malaysia
    (2024-12)
    Ng, Kin Hoong
    Biopesticides, derived from natural sources like plant extracts and fungi, are eco–friendly alternatives to synthetic insecticides, offering minimal environmental and human health risks while reducing resistance development. Adult bioassays revealed that urban and suburban ae. Aegypti and ae. Albopictus were resistant to four chemical insecticides (0.05% deltamethrin, 0.75% permethrin, 5% malathion, 0.25% pirimiphos–methyl), but resistance decreased with piperonyl butoxide (pbo). This study evaluated the efficacy of ipomoea cairica leaf extracts (solvent: acetone) and metarhizium anisopliae (meta–g4) in controlling insecticide–resistant aedes populations on penang island. Ipomoea cairica leaf extracts demonstrated the highest larvicidal activity against aedes aegypti urban and suburban strains, while m. Anisopliae was most effective against aedes albopictus suburban strains, with optimal mortality achieved using 500 ppm i. Cairica extract or 1×108 conidia/ml of 14–day-old m. Anisopliae. Synergistic effects were observed when 350 ppm i. Cairica was combined with 1×106 conidia/ml m. Anisopliae, achieving a robust “dual-attack” against ae. Aegypti. The compatibility of biopesticides with insecticides also enhanced efficacy against adult aedes, particularly in ae. Albopictus. Biochemical assays confirmed metabolic resistance mechanisms, with ae. Aegypti showing susceptibility but some tolerance to biopesticides, highlighting their potential in integrated resistance management.
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    Biosynthesis And Optimization Of P(3hb-Co-3hv-Co-4hb) Terpolymer Using Glycerine Pitch As Carbon Source
    (2024-11)
    Ibn, Abbas Musa
    Conventional plastics have become an essential commodity that provides comfort through their applications in the packaging, medical, agricultural, and pharmaceutical industries. However, traditional plastic is recalcitrant to microbial degradation. Bioplastics like polyhydroxyalkanoates (phas) are biodegradable and biocompatible materials that have proven to be an alternative to synthetic plastics. One of the significant problems of pha biosynthesis is the cost of carbon sources, which accounts for about 40% of production costs. The use of major food-grade oils is uneconomical and unsustainable as it may limit the availability of cooking oil and trigger an increase in the price of edible oil, leading to food-feed competition. Therefore, glycerine pitch produced pha in cupriavidus malaysiensis usmaa1020 via single-stage cultivation and optimized in a 13 l bioreactor. Two other monomers were incorporated by the addition of 1,4 butanediol and 1-pentanol, resulting in the synthesis of a terpolymer consisting of 3hb, 3hv and 4hb monomers [p(3hb-co-3hv-co-4hb)]. Effects of different concentrations of glycerine pitch, 1-pentanol, 1,4 butanediol, and oleic acid were studied.