Institut Penyelidikan Perubatan Molekul - Tesis

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Effect Of Murine Norovirus-3 (Mnv-3) Infection On Atherosclerosis Development In Macrophage Cell Lines And C57bl/6 Mice
(2024-12)
Rumah, Muhammad Hayatuddeen
Atherosclerosis, a chronic inflammatory disease, is characterized by lipid build-up in the arterial wall and regulated by innate and adaptive immune responses. Significant roles in the disease’s onset and progression are played by macrophages and various t-cell subsets. The effect of murine noroviruses-3 (mnv-3) infection on atherosclerosis development was investigated in this study using in vitro and in vivo models. In the in vitro model, atherosclerosis was induced by oxldl, whereas in the in vivo model, a cholesterol-rich diet was used to induce atherosclerosis in c57bl/6 mice. In the in vitro experiment, a reduction in atherosclerosis was observed in pre-infected raw 264.7 cells due to decreased tce , pro-inflammatory cytokine secretion (tnf-α, il-6, il-1β), and macrophage surface protein expression (cd88, cd36, cd11b) levels. Conversely, mnv-3 infection promoted atherosclerosis in post-infected raw 264.7 cells by elevating tce levels, boosting tnf-α, il-6, il-1β secretions, and promoting cd88, cd36, cd11b expression levels. Lastly, no significant alteration in atherosclerosis was observed in co-infected raw 264.7 cells, as tce levels, tnf-α, il-6, il-1β secretions, and cd88, cd36, cd11b expression levels were not significantly affected. In thp-1 derived macrophages, mnv-3 promoted atherosclerosis by boosting tnf-α, il-6, il-1β secretions and promoting cd88, cd36, cd11b expression levels.
A Single Domain Antibody Derived From Antibody Phage Display Library Fused With Cell Penetrating Peptide For The Clearance Of Il-23
(2024-10)
Abdo, Ahmad Ismail Khaled
Il-23 is a two-subunit proinflammatory cytokine that plays an important role in shaping the immune response. It is associated with several autoinflammatory diseases by generating sustained inflammatory loops through the il-17 and il-22 arms leading to tissue damage. Antibody neutralization of il-23 was proven to be effective in breaking these loops and ameliorating disease. However, antibodies have limited tissue penetration and tend to elicit anti-drug antibodies due to their large size. Additionally, anti-il-23 antibodies target only one subunit of the cytokine, either p40 or p19, leaving the other one unneutralized. This study aimed to generate an anti-il-23 single domain antibody (sdab) that leads to antigen-clearance. Two methods of antigen clearance were explored, the isolation of a recycling sdab by phage display and conjugation of sdab to cell penetrating peptides (cpps). The sdab was generated by phage display biopanning against one of the il-23 subunits, p19, which was expressed in e.Coli fused to gamillus (gam) protein as a stabilizer. Biopanning failed to isolate specific, high-affinity recycling binders for p19, however, a specific and high-affinity standard binder for p19 was successfully isolated. The isolated sdab, designated as h11, was conjugated with two cpps, r9 and tatk, respectively. Elisa results of p19 binding to purified h11, h11-r9, and h11-tatk , showed that cpps conjugation did not alter the h11 binding affinity. The functionality of the purified sdabs was further examined to evaluate the cpp fusion effect.
Study on effect of surface roughness of no tie bar (ntb) lead frame to mitigate delamination in small outline integrated chip (soic) packaging
(2025-09-01)
Thanigesh, Thiyagu
The widespread application of SOIC as digital isolators in various domains has raised high interest by the industrial key players. Due to constant drive for faster data rates, better performance and high operation rate, SOIC digital isolators are commonly subjected to higher mechanical and thermal stress in long term application which leads to delamination issue. Delamination has resulted in functionality failure of the chip in end user applications. To mitigate delamination, correlation between no tie bar (NTB) lead frame and surface roughness was studied by examining the critical to quality (CTQ) criteria in wire bonding and molding process parameter. The research work investigated two types of samples which were roughened and non – roughened NTB lead frame. Chips were manufactured through packaging assembly process using both frame samples followed by reliability test assessment such as moisture sensitivity level (MSL), unbiased highly accelerated stress test (UHAST), temperature cycle and high temperature storage (HTS). Characterization study of frames was done with scanning electron microscopy (SEM), atomic force microscopy (AFM), energy dispersive X – ray (EDX), optical microscopy, scanning acoustic topography (SAT) and X – ray. The ball shear, wire pull, stitch pull output response for roughened frame was higher than in non – roughened frame in wire bonding process. Whereas in molding process output response, roughened frame displayed better control in horizontal mean offset unlike non - roughened frame which had better control in vertical mean offset. Wire sweep and mold void was comparable in both samples meeting requirements. In reliability test, chips using roughened NTB lead frame demonstrated greater reliability with no delamination compared to non – roughened frame chips at post MSL, UHAST, temperature cycle and HTS test.
Immunogenicity Evaluation Of A133 And Ss-Ir: Development Of Vaccine Candidates Against Strongyloides Stercoralis
(2024-02)
Wong, Matthew Tze Jian
Strongyloidiasis, caused by the nematode Strongyloides stercoralis, remains a threat to global public health. To date, a vaccine against strongyloidiasis remains unavailable and there was no significant development in this area after discovering the potential of recombinant protein Ss-IR as a vaccine candidate in 2011. In light of recent developments in the diagnosis of strongyloidiasis, A133 emerged in 2021 as an excellent diagnostic antigen, prompting curiosity for its potential as a vaccine candidate. Therefore, this study aimed to evaluate the efficacy of recombinant protein A133 in comparison to Ss-IR, as a potential vaccine candidate against S. stercoralis by investigating humoral and cellular immune responses in immunised mice.
Influence Of Coaching Communication By Middle-Leaderstowards Teacher's Performance:Teaching Self-Efficacy As Mediator And Trust Towards Coach As Moderator
(2024-02)
Nazrin, Marina
The study generally aims to identify practices executed by secondary school teachers with the influence of coaching communication by middle leaders towards their performance. Specifically, the study also aims to identify the role of trust towards coach as the potential moderator variable between coaching communication and teaching self-efficacy while the role of teaching self-efficacy in this study is the mediator towards coaching communication and teachers’ performance.

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