Displaying publications 1 - 20 of 71 in total

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  1. Teng KT, Chang CY, Kanthimathi MS, Tan AT, Nesaretnam K
    Atherosclerosis, 2015 Sep;242(1):281-7.
    PMID: 26232169 DOI: 10.1016/j.atherosclerosis.2015.07.003
    Postprandial lipemia has been reported to affect endothelial function by thrombogenic and inflammatory pathways. We set out to investigate the impact of a) specific amount (50 g vs 20 g fat), and b) type of fatty acids (saturated, monounsaturated or n-6 polyunsaturated fatty acids; SFA, MUFA, PUFA) on postprandial lipemia, thrombogenic and inflammatory factors in metabolic syndrome subjects.
  2. Chang CY, Lau NLJ, Currie BJ, Podin Y
    BMC Infect Dis, 2020 Mar 06;20(1):201.
    PMID: 32143598 DOI: 10.1186/s12879-020-4937-8
    BACKGROUND: Melioidosis is a potentially life-threatening infection caused by the Gram-negative bacterium Burkholderia pseudomallei. Melioidosis is difficult to diagnose due to its diverse clinical manifestations, which often delays administration of appropriate antibiotic therapy.

    CASE PRESENTATION: Melioidosis is uncommon in pregnancy but both spontaneous abortion and neonatal melioidosis have been reported. We report a case of bacteraemic melioidosis in a young woman with a subsequent spontaneous abortion, with B. pseudomallei cultured from a high vaginal swab as well as blood.

    CONCLUSION: It remains unclear in this and previously reported cases as to whether the maternal melioidosis was sexually transmitted.

  3. Chang CY, Arasu K, Wong SY, Ong SH, Yang WY, Chong MHZ, et al.
    BMC Pediatr, 2021 09 03;21(1):382.
    PMID: 34479539 DOI: 10.1186/s12887-021-02842-6
    BACKGROUND: Modifiable lifestyle factors and body composition can affect the attainment of peak bone mass during childhood. This study performed a cross-sectional analysis of the determinants of bone health among pre-adolescent (N = 243) Malaysian children with habitually low calcium intakes and vitamin D status in Kuala Lumpur (PREBONE-Kids Study).

    METHODS: Body composition, bone mineral density (BMD), and bone mineral content (BMC) at the lumbar spine (LS) and total body (TB) were assessed using dual-energy X-ray absorptiometry (DXA). Calcium intake was assessed using 1-week diet history, MET (metabolic equivalent of task) score using cPAQ physical activity questionnaire, and serum 25(OH) vitamin D using LC-MS/MS.

    RESULTS: The mean calcium intake was 349 ± 180 mg/day and mean serum 25(OH)D level was 43.9 ± 14.5 nmol/L. In boys, lean mass (LM) was a significant predictor of LSBMC (β = 0.539, p 

  4. Kiew LV, Chang CY, Huang SY, Wang PW, Heh CH, Liu CT, et al.
    Biosens Bioelectron, 2021 Jul 01;183:113213.
    PMID: 33857754 DOI: 10.1016/j.bios.2021.113213
    Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) enters the cells through the binding of its spike protein (S-protein) to the cell surface-expressing angiotensin-converting enzyme 2 (ACE2). Thus, inhibition of S-protein-ACE2 binding may impede SARS-CoV-2 cell entry and attenuate the progression of Coronavirus disease 2019 (COVID-19). In this study, an electrochemical impedance spectroscopy-based biosensing platform consisting of a recombinant ACE2-coated palladium nano-thin-film electrode as the core sensing element was fabricated for the screening of potential inhibitors against S-protein-ACE2 binding. The platform could detect interference of small analytes against S-protein-ACE2 binding at low analyte concentration and small volume (0.1 μg/mL and ~1 μL, estimated total analyte consumption 
  5. Tsai PT, Lin KC, Wu CY, Liao CH, Lin MC, Wong YQ, et al.
    ChemSusChem, 2017 07 10;10(13):2778-2787.
    PMID: 28516516 DOI: 10.1002/cssc.201700601
    Here, we report that long-term stable and efficient organic solar cells (OSCs) can be obtained through the following strategies: i) combination of rapid-drying blade-coating deposition with an appropriate thermal annealing treatment to obtain an optimized morphology of the active layer; ii) insertion of interfacial layers to optimize the interfacial properties. The resulting devices based on poly[4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)benzo[1,2-b;4,5-b']dithiophene-2,6-diyl-alt-(4-(2-ethylhexyl)-3-fluorothieno[3,4-b]thiophene-2-carboxylate-2,6-diyl)] (PBDTTT-EFT):[6,6]-phenyl C71 butyric acid methyl ester (PC71 BM) blend as the active layer exhibits a power conversion efficiency (PCE) up to 9.57 %, which represents the highest efficiency ever reported for blade-coated OSCs. Importantly, the conventional structure devices based on poly(3-hexylthiophene) (P3HT):phenyl-C61 -butyric acid methyl ester (PCBM) blend can retain approximately 65 % of their initial PCE for almost 2 years under operating conditions, which is the best result ever reported for long-term stable OSCs under operational conditions. More encouragingly, long-term stable large-area OSCs (active area=216 cm2 ) based on P3HT:PCBM blend are also demonstrated. Our findings represent an important step toward the development of large-area OSCs with high performance and long-term stability.
  6. Chang CY, Chan EZ
    Clin Case Rep, 2023 Jan;11(1):e6887.
    PMID: 36698520 DOI: 10.1002/ccr3.6887
    Cardiac myxomas are the most common primary cardiac tumors in adults, with the left atrium being the most frequently affected. Echocardiography is the diagnostic modality of choice. The most effective treatment for cardiac myxomas is surgical excision.
  7. Chang CY, Rajappan M, Zaid M, Ong ELC
    Clin Case Rep, 2020 Dec;8(12):3427-3431.
    PMID: 33363946 DOI: 10.1002/ccr3.3422
    Hemophagocytic lymphohistiocytosis is a rare but severe complication of dengue infection which carries a high mortality. This report highlights the importance of early recognition of this condition as prompt appropriate treatment improves outcomes.
  8. Chang CY, Chai CSY, Ong ELC
    Clin Case Rep, 2020 Dec;8(12):2685-2688.
    PMID: 33363805 DOI: 10.1002/ccr3.3272
    Pulmonary arteriovenous malformation is a vascular anomaly that predisposes to complications of paradoxical embolization including stroke and brain abscess. Here, we present a case of brain abscess associated with pulmonary arteriovenous malformation.
  9. Arasu K, Chang CY, Wong SY, Ong SH, Yang WY, Chong MHZ, et al.
    Contemp Clin Trials Commun, 2021 Jun;22:100801.
    PMID: 34195468 DOI: 10.1016/j.conctc.2021.100801
    Background: Recruitment and retention in longitudinal nutrition intervention studies among children is challenging and scarcely reported. This paper describes the strategies and lessons learned from a 1-year randomized double-blind placebo-controlled trial among pre-adolescent children on the effects of soluble corn fiber (SCF) on bone indices (PREBONE-Kids).

    Methods: Participants (9-11 years old) were recruited and randomized into 4 treatment groups (600 mg calcium, 12 g SCF, 12 g SCF plus 600 mg calcium and placebo). Interventions were consumed as a fruit-flavored powdered drink for 1-year. School-based recruitment was effective due to support on study benefits from parents and teachers, peer influence and a 2-weeks study run-in for participants to assess their readiness to commit to the study protocol. Retention strategies focused on building rapport through school-based fun activities, WhatsApp messaging, providing health screening and travel reimbursements for study measurements. Compliance was enhanced by providing direct on-site school feeding and monthly non-cash rewards. Choice of 2 flavors for the intervention drinks were provided to overcome taste fatigue. Satisfaction level on the manner in which the study was conducted was obtained from a voluntary sub-set of participants.

    Results: The study successfully enrolled 243 participants within 6 months and retained 82.7% of the participants at the end of 1 year, yielding a drop-out rate of 17.3%. Compliance to the intervention drink was 85% at the start and remained at 78.7% at the end of 1 year. More than 95% of the participants provided good feedback on intervention drinks, rapport building activities, communication and overall study conduct.

    Conclusion: Successful strategies focused on study benefits, rapport building, frequent communication using social media and non-cash incentives helped improved compliance and retention rate. The lessons learned to maintain a high retention and compliance rate in this study provide valuable insights for future studies in a similar population.

  10. Chang CY, Devi Nath N, Lam K, Zaid M
    Cureus, 2022 Nov;14(11):e31660.
    PMID: 36540495 DOI: 10.7759/cureus.31660
    Introduction Carbapenems are broad-spectrum antibiotics used to treat infections caused by multidrug-resistant organisms. The inappropriate use of carbapenem results in the development of antimicrobial resistance. The aim of this study was to determine the impact of an antimicrobial stewardship intervention on the appropriateness of carbapenem use. Method The study includes a baseline/pre-intervention audit, an intervention, and a post-intervention study to examine the impact of antimicrobial stewardship activities on carbapenem use. Audit and data collection were carried out by filling up an audit form. The indicator for this study will be the appropriateness of carbapenem use (appropriate, suboptimal, or inappropriate) pre- and post-intervention. Results The overall appropriateness of carbapenem prescription in the medical wards increased from 65% to 83.3% following the implementation of antimicrobial stewardship intervention. The most common indication of carbapenem usage in our study was hospital-acquired pneumonia/ventilator-associated pneumonia. Conclusion Antimicrobial stewardship intervention is effective in improving the appropriateness of carbapenem use. Tailored stewardship programs are required to better control carbapenem use and combat antimicrobial resistance.
  11. Singh R, Jayanna M, Wong J, Lim LG, Zhang J, Lv J, et al.
    Endosc Int Open, 2015 Feb;3(1):E14-8.
    PMID: 26134765 DOI: 10.1055/s-0034-1377610
    The advent and utility of new endoscopic imaging modalities for predicting the histology of Barrett's esophagus (BE) in real time with high accuracy appear promising and could potentially obviate the need to perform random biopsies where guidelines are poorly adhered to. We embarked on evaluating the performance characteristics of white-light endoscopy with magnification (WLE-z), narrow-band imaging with magnification (NBI-z) and a combination of both modalities.
  12. Chang CY, Kanthimathi MS, Tan AT, Nesaretnam K, Teng KT
    Eur J Nutr, 2018 Feb;57(1):179-190.
    PMID: 27632019 DOI: 10.1007/s00394-016-1307-9
    PURPOSE: Limited clinical evidence is available on the effects of amount and types of dietary fats on postprandial insulinemic and gastrointestinal peptide responses in metabolic syndrome subjects. We hypothesized that meals enriched with designated: (1) amount of fats (50 vs 20 g), (2) fats with differing fatty acid composition (saturated, SFA; monounsaturated, MUFA or n-6 polyunsaturated fatty acids, PUFA) would affect insulinemic and gastrointestinal peptide releases in metabolic syndrome subjects.

    METHODS: Using a randomized, crossover and double-blinded design, 15 men and 15 women with metabolic syndrome consumed high-fat meals enriched with SFA, MUFA or n-6 PUFA, or a low-fat/high-sucrose (SUCR) meal. C-peptide, insulin, glucose, gastrointestinal peptides and satiety were measured up to 6 h.

    RESULTS: As expected, SUCR meal induced higher C-peptide (45 %), insulin (45 %) and glucose (49 %) responses compared with high-fat meals regardless of types of fatty acids (P < 0.001). Interestingly, incremental area under the curve (AUC0-120min) for glucagon-like peptide-1 was higher after SUCR meal compared with MUFA (27 %) and n-6 PUFA meals (23 %) (P = 0.01). AUC0-120min for glucose-dependent insulinotropic polypeptide was higher after SFA meal compared with MUFA (23 %) and n-6 PUFA meals (20 %) (P = 0.004). Significant meal x time interaction (P = 0.007) was observed for ghrelin, but not cholecystokinin and satiety.

    CONCLUSIONS: The amount of fat regardless of the types of fatty acids affects insulin and glycemic responses. Both the amount and types of fatty acids acutely affect the gastrointestinal peptide release in metabolic syndrome subjects, but not satiety.

  13. Liu YC, Chan KG, Chang CY
    Front Microbiol, 2015;6:1226.
    PMID: 26617576 DOI: 10.3389/fmicb.2015.01226
    Bacterial cells sense their population density and respond accordingly by producing various signal molecules to the surrounding environments thereby trigger a plethora of gene expression. This regulatory pathway is termed quorum sensing (QS). Plenty of bacterial virulence factors are controlled by QS or QS-mediated regulatory systems and QS signal molecules (QSSMs) play crucial roles in bacterial signaling transduction. Moreover, bacterial QSSMs were shown to interfere with host cell signaling and modulate host immune responses. QSSMs not only regulate the expression of bacterial virulence factors but themselves act in the modulation of host biology that can be potential therapeutic targets.
  14. Chan KG, Liu YC, Chang CY
    Front Microbiol, 2015;6:1173.
    PMID: 26539190 DOI: 10.3389/fmicb.2015.01173
    Bacteria sense their own population size, tune the expression of responding genes, and behave accordingly to environmental stimuli by secreting signaling molecules. This phenomenon is termed as quorum sensing (QS). By exogenously manipulating the signal transduction bacterial population behaviors could be controlled, which may be done through quorum quenching (QQ). QS related regulatory networks have been proven their involvement in regulating many virulence determinants in pathogenic bacteria in the course of infections. Interfering with QS signaling system could be a novel strategy against bacterial infections and therefore requires more understanding of their fundamental mechanisms. Here we review the development of studies specifically on the inhibition of production of N-acyl-homoserine lactone (AHL), a common proteobacterial QS signal. The opportunistic pathogen, Pseudomonas aeruginosa, equips the alkylquinolone (AQ)-mediated QS which also plays crucial roles in its pathogenicity. The studies in QQ targeting on AQ are also discussed.
  15. Chen JW, Lau YY, Krishnan T, Chan KG, Chang CY
    Front Microbiol, 2018;9:1104.
    PMID: 29892277 DOI: 10.3389/fmicb.2018.01104
    Pseudomonas aeruginosa is a rod-shaped Gram-negative bacterium which is notably known as a pathogen in humans, animals, and plants. Infections caused by P. aeruginosa especially in hospitalized patients are often life-threatening and rapidly increasing worldwide throughout the years. Recently, multidrug-resistant P. aeruginosa has taken a toll on humans' health due to the inefficiency of antimicrobial agents. Therefore, the rapid and advanced diagnostic techniques to accurately detect this bacterium particularly in clinical samples are indeed necessary to ensure timely and effective treatments and to prevent outbreaks. This review aims to discuss most recent of state-of-the-art molecular diagnostic techniques enabling fast and accurate detection and identification of P. aeruginosa based on well-developed genotyping techniques, e.g., polymerase chain reaction, pulse-field gel electrophoresis, and next generation sequencing. The advantages and limitations of each of the methods are also reviewed.
  16. Tan KH, Sheng KY, Chang CY, Yin WF, Chan KG
    Genome Announc, 2015;3(1).
    PMID: 25657288 DOI: 10.1128/genomeA.01542-14
    Dickeya sp. strain 2B12 was isolated from a freshwater lake in Malaysia. Here, we report the draft genome sequence of Dickeya sp. 2B12 sequenced by the Illumina MiSeq platform. With the genome sequence available, this genome sequence will be useful for the study of quorum-sensing activity in this isolate.
  17. Tan WS, Yin WF, Chang CY, Chan KG
    Genome Announc, 2015;3(1).
    PMID: 25700404 DOI: 10.1128/genomeA.01548-14
    Aeromonas hydrophila is a well-known waterborne pathogen that recently was found to infect humans. Here, we report the draft genome of a freshwater isolate from a Malaysian waterfall, A. hydrophila strain M023, which portrays N-acylhomoserine lactone-dependent quorum sensing.
  18. Chan KG, Chin PS, Tee KK, Chang CY, Yin WF, Sheng KY
    Genome Announc, 2015;3(2).
    PMID: 25745006 DOI: 10.1128/genomeA.00079-15
    Here, we present the draft genome sequence of Aeromonas caviae strain L12, which shows quorum-sensing activity. The availability of this genome sequence is important to the research of the quorum-sensing regulatory system in this isolate.
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