Displaying publications 1 - 20 of 21 in total

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  1. Jothinathan M, Lau KS, Vanusha D
    Med J Malaysia, 2020 03;75(2):178-180.
    PMID: 32281605
    Juvenile dermatomyositis (JDM) is a systemic autoimmune condition with myopathy. Gastrointestinal and pulmonary manifestations are rare presentation of JDM. Gastrointestinal perforation incidence in JDM is associated with vasculopathy and ischaemia. There are only few reported case of management of JDM with gastrointestinal complication. Management of such condition is challenging. We present a 21-year-old man with spontaneous descending colon perforation undergoing Hartmann's procedure. He subsequently presented with recurrent retroperitoneal abscess at five and 30 months following the initial presentation which was treated with percutaneous drainage. A high index of suspicion is necessary in JDM patients presenting with acute abdomen.
  2. Lau KS, White JC
    J Clin Pathol, 1969 Jul;22(4):433-8.
    PMID: 4183835 DOI: 10.1136/jcp.22.4.433
    Three cases of myelosclerosis associated with systemic lupus erythematosus are described. The probable role of systemic lupus erythematosus in the initiation of myelonecrosis and subsequent myelosclerosis is discussed.
  3. Lai CW, Lau KS, Chou PM
    J Nanosci Nanotechnol, 2019 Dec 01;19(12):7934-7942.
    PMID: 31196312 DOI: 10.1166/jnn.2019.16777
    Using solar-powered water electrolysis systems for hydrogen generation is a key decision for the development of a sustainable hydrogen economy. A facile approach is presented in the present investigation to improve the solar-powered photoelectrochemical performance of water electrolysis systems by synthesising well-aligned and highly ordered TiO₂ nanotube films without bundling through the electrochemical anodisation technique. Herein, geometrical calculations were conducted for all synthesised TiO₂ nanotubes, and determination of the aspect ratio (AR) and geometric surface area factor (G) was achieved. On the basis of the collected data, well-aligned TiO₂ nanotubes with an AR of approximately 60 and G of approximately 400 m² ·g-1 were successfully formed in an electrolyte mixture of ethylene glycol with 0.3 wt% NH4F and 5 wt% H₂O₂ at 40 V for 60 min. The nanotubes were subsequently annealed at 400 °C to form anatase-phase TiO₂ nanotube films. The resultant well-aligned and highly ordered TiO₂ nanotube films exhibited a photocurrent density of 1.5 mA · cm-2 due to a large number of photo-induced electrons moving along the tube axis and perpendicular to the Ti substrate, which greatly reduces interfacial recombination losses.
  4. Ng KH, Sinnathuray TA, Lau KS
    Med J Malaysia, 1972 Mar;26(3):159-163.
    PMID: 35158513
    No abstract available.
  5. Robinson MJ, Lau KS, Lin HP, Chan GL
    Med J Malaysia, 1976 Jun;30(4):287-90.
    PMID: 979730
  6. Soo WT, Lau KS, Yong SG, Soon KC
    Med J Malaysia, 2021 07;76(4):597-599.
    PMID: 34305129
    Giant splenic cyst is rare disorder affecting the spleen. As the occurrence is so in-frequent that the diagnosis preoperatively remains a challenge. We report a 12-year-old boy who presented to Sarawak General Hospital, Malaysia with left upper abdominal pain initially mistaken as a complex left liver cyst. He underwent surgery which turned out to be a giant splenic cyst and underwent laparotomy and total splenectomy. He was discharged well and remains asymptomatic after 6 months postoperative follow up.
  7. White JC, Chan LK, Lau KS, Sen DK
    J Trop Med Hyg, 1976 Jun;79(6):132-6.
    PMID: 1084931
    Five patients illustrate various aspects of obstetrical defibrination in West Malaysia, resulting from exaggeration of changes in fibrinolytic-coagulation equilibrium that occur at delivery. Hypofibrinogenaemia and fibrinolysis may occur in association or either feature predominate. These patients are from a population in which a variety of genetic and environmental factors may interact, e.g. abnormal haemoglobins, cold agglutinins, viral and other infections, introducing additional complications.
  8. Toh BH, Sengupta S, Ang AH, White JC, Lau KS
    Ann Rheum Dis, 1973 Mar;32(2):151-6.
    PMID: 4120913 DOI: 10.1136/ard.32.2.151
    In West Malaysia RA appears to be less common than in temperate climates, but more common than in tropical Africa; furthermore, the incidence of gout and SLE is comparable. The clinical manifestations of RA are milder than those seen in more temperate climates. Subcutaneous rheumatoid nodules have not been observed. Positive serological tests for RF are significantly higher than in the general Malaysian population, but still lower than those reported for patients with RA in temperate climates. Of the three main ethnic groups, the highest incidence of positive results is found in the Chinese.
    Study site: Arthritis Clinic, University Hospital, Kuala Lumpur (University Malaya Medical Centre, UMMC, Kuala Lumpur, Malaysia)
  9. Abd Samad NA, Lai CW, Lau KS, Abd Hamid SB
    Materials (Basel), 2016 Nov 22;9(11).
    PMID: 28774068 DOI: 10.3390/ma9110937
    Efficient solar driven photoelectrochemical (PEC) response by enhancing charge separation has attracted great interest in the hydrogen generation application. The formation of one-dimensional ZnO nanorod structure without bundling is essential for high efficiency in PEC response. In this present research work, ZnO nanorod with an average 500 nm in length and average diameter of about 75 nm was successfully formed via electrodeposition method in 0.05 mM ZnCl₂ and 0.1 M KCl electrolyte at 1 V for 60 min under 70 °C condition. Continuous efforts have been exerted to further improve the solar driven PEC response by incorporating an optimum content of TiO₂ into ZnO nanorod using dip-coating technique. It was found that 0.25 at % of TiO₂ loaded on ZnO nanorod film demonstrated a maximum photocurrent density of 19.78 mA/cm² (with V vs. Ag/AgCl) under UV illumination and 14.75 mA/cm² (with V vs. Ag/AgCl) under solar illumination with photoconversion efficiency ~2.9% (UV illumination) and ~4.3% (solar illumination). This performance was approximately 3-4 times higher than ZnO film itself. An enhancement of photocurrent density and photoconversion efficiency occurred due to the sufficient Ti element within TiO₂-ZnO nanorod film, which acted as an effective mediator to trap the photo-induced electrons and minimize the recombination of charge carriers. Besides, phenomenon of charge-separation effect at type-II band alignment of Zn and Ti could further enhance the charge carrier transportation during illumination.
  10. Chin SX, Lau KS, Zakaria S, Chia CH, Wongchoosuk C
    Polymers (Basel), 2022 Nov 27;14(23).
    PMID: 36501560 DOI: 10.3390/polym14235165
    Wastewater generated from industries seriously impacts the environment. Conventional biological and physiochemical treatment methods for wastewater containing organic molecules have some limitations. Therefore, identifying other alternative methods or processes that are more suitable to degrade organic molecules and lower chemical oxygen demand (COD) in wastewater is necessary. Heterogeneous Fenton processes and persulfate (PS) oxidation are advanced oxidation processes (AOPs) that degrade organic pollutants via reactive radical species. Therefore, in this study, limonite powder was incorporated into porous regenerated chitosan fibers and further used as a heterogeneous catalyst to decompose methylene blue (MB) via sulfate radical-based AOPs. Limonite was used as a heterogeneous catalyst in this process to generate the persulfate radicals (SO4-·) that initiate the decolorization process. Limonite-chitosan fibers were produced to effectively recover the limonite powder so that the catalyst can be reused repeatedly. The formation of limonite-chitosan fibers viewed under a field emission scanning electron microscope (FESEM) showed that the limonite powder was well distributed in both the surface and cross-section area. The effectiveness of limonite-chitosan fibers as a catalyst under PS activation achieved an MB decolorization of 78% after 14 min. The stability and reusability of chitosan-limonite fibers were evaluated and measured in cycles 1 to 10 under optimal conditions. After 10 cycles of repeated use, the limonite-chitosan fiber maintained its performance up to 86%, revealing that limonite-containing chitosan fibers are a promising reusable catalyst material.
  11. Chin SX, Lau KS, Ginting RT, Tan ST, Khiew PS, Chia CH, et al.
    Polymers (Basel), 2023 Sep 14;15(18).
    PMID: 37765612 DOI: 10.3390/polym15183758
    Wearable energy storage devices require high mechanical stability and high-capacitance flexible electrodes. In this study, we design a flexible supercapacitor electrode consisting of 1-dimensional carbon nanotubes (CNT), cellulose nanofibrils (CNF), and manganese dioxide nanowires (MnO2 NWs). The flexible and conductive CNT/CNF-MnO2 NWs suspension was first prepared via ultrasonic dispersion approach, followed by vacuum filtration and hot press to form the composite paper electrode. The morphological studies show entanglement between CNT and CNF, which supports the mechanical properties of the composite. The CNT/CNF-MnO2 NWs electrode exhibits lower resistance when subjected to various bending angles (-120-+120°) compared to the CNT/CNF electrode. In addition, the solid-state supercapacitor also shows a high energy density of 38 μWh cm-2 and capacitance retention of 83.2% after 5000 cycles.
  12. Ong YN, James V, Lau KS, Chor YK, Ong GY
    Pediatr Emerg Care, 2022 Apr 01;38(4):183-186.
    PMID: 34608058 DOI: 10.1097/PEC.0000000000002555
    Abdominal pain is one of the most common presenting complaints encountered in the pediatric emergency department. The use of point-of-care ultrasonography by emergency physicians has been shown to expedite the diagnosis of a large variety of conditions and can be used to accurately identify intra-abdominal pathology in children. We describe the case of a pediatric patient who presented to the pediatric emergency department with acute abdominal pain, in whom point-of-care ultrasonography helped expedite the diagnosis of acute portal vein thrombosis and liver abscess.
  13. Lai CW, Samsudin NA, Low FW, Abd Samad NA, Lau KS, Chou PM, et al.
    Materials (Basel), 2020 Jun 03;13(11).
    PMID: 32503128 DOI: 10.3390/ma13112533
    In this present work, we report the deposition of cadmium selenide (CdSe) particles on titanium dioxide (TiO2) nanotube thin films, using the chemical bath deposition (CBD) method at low deposition temperatures ranging from 20 to 60 °C. The deposition temperature had an influence on the overall CdSe-TiO2 nanotube thin film morphologies, chemical composition, phase transition, and optical properties, which, in turn, influenced the photoelectrochemical performance of the samples that were investigated. All samples showed the presence of CdSe particles in the TiO2 nanotube thin film lattice structures with the cubic phase CdSe compound. The amount of CdSe loading on the TiO2 nanotube thin films were increased and tended to form agglomerates as a function of deposition temperature. Interestingly, a significant enhancement in photocurrent density was observed for the CdSe-TiO2 nanotube thin films deposited at 20 °C with a photocurrent density of 1.70 mA cm-2, which was 17% higher than the bare TiO2 nanotube thin films. This sample showed a clear surface morphology without any clogged nanotubes, leading to better ion diffusion, and, thus, an enhanced photocurrent density. Despite having the least CdSe loading on the TiO2 nanotube thin films, the CdSe-TiO2 nanotube thin films deposited at 20 °C showed the highest photocurrent density, which confirmed that a small amount of CdSe is enough to enhance the photoelectrochemical performance of the sample.
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