43 results on '"Toh G"'
Search Results
2. A survey of termites in the Singapore Botanic Gardens Rain Forest
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Choo-Toh, G T, Chaw, S L, Chan, C E Z, Goh, D H W, Lee, E Y H, and BioStor
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- 1998
3. 983 Corynebacterium diphtheriae causes keratinocyte-intrinsic ribotoxic stress and NLRP1 inflammasome activation in a model of cutaneous diphtheria
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Robinson, K., primary, Toh, G., additional, Tham, K., additional, Common, J.E., additional, and Zhong, F., additional
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- 2023
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4. Thymosin Beta‐4 Is Elevated in Women With Heart Failure With Preserved Ejection Fraction
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Chester L. Drum, Warren K. Y. Tan, Siew‐Pang Chan, Leroy S. Pakkiri, Jenny P. C. Chong, Oi‐Wah Liew, Tze‐Pin Ng, Lieng‐Hsi Ling, David Sim, Kui‐Toh G. Leong, Daniel P. S. Yeo, Hean‐Yee Ong, Fazlur Jaufeerally, Raymond C. C. Wong, Ping Chai, Adrian F. Low, Pia Davidsson, Mathias Liljeblad, Ann‐Sofi Söderling, Li‐Ming Gan, Ratan V. Bhat, Kristy Purnamawati, Carolyn S. P. Lam, and A. Mark Richards
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biomarker ,cardiac biomarkers ,CD40/CD40L ,heart failure ,liquid chromatography‐mass spectrometry ,proximity extension assay ,Diseases of the circulatory (Cardiovascular) system ,RC666-701 - Abstract
BackgroundThymosin beta‐4 (TB4) is an X‐linked gene product with cardioprotective properties. Little is known about plasma concentration of TB4 in heart failure (HF), and its relationship with other cardiovascular biomarkers. We sought to evaluate circulating TB4 in HF patients with preserved (HFpEF) or reduced (HFrEF) ejection fraction compared to non‐HF controls. Methods and ResultsTB4 was measured using a liquid chromatography and mass spectrometry assay in age‐ and sex‐matched HFpEF (n=219), HFrEF (n=219) patients, and controls (n=219) from a prospective nationwide study. Additionally, a 92‐marker multiplex proximity extension assay was measured to identify biomarker covariates. Compared with controls, plasma TB4 was elevated in HFpEF (985 [421–1723] ng/mL versus 1401 [720–2379] ng/mL, P
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- 2017
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5. Growth differentiation factor 15 in heart failure with preserved vs. reduced ejection fraction
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Chan, Michelle M.Y., Santhanakrishnan, Rajalakshmi, Chong, Jenny P.C., Chen, Zhaojin, Tai, Bee Choo, Liew, Oi Wah, Ng, Tze Pin, Ling, Lieng H., Sim, David, Leong, Kui Toh G., Yeo, Poh Shuan Daniel, Ong, Hean-Yee, Jaufeerally, Fazlur, Wong, Raymond Ching-Chiew, Chai, Ping, Low, Adrian F., Richards, Arthur M., and Lam, Carolyn S.P.
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- 2016
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6. Combining Circulating MicroRNA and NT-proBNP to Detect and Categorize Heart Failure Subtypes
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Michelle Chan, Raymond Wong, Adrian F. Low, Heng-Phon Too, Yei Tsung Chen, Jessica Y.X. Ng, Jenny P.C. Chong, Dominic C.Y. Phua, Poh Shuan D. Yeo, Gerry Devlin, Richard W. Troughton, Arthur Mark Richards, Chengcheng Liu, Carolyn S.P. Lam, Hean Yee Ong, Fazlur Jaufeerally, Jia Yuen Lim, Siew Pang Chan, Vicky A. Cameron, Lieng H. Ling, Tze Pin Ng, Kui Toh G. Leong, Ping Chai, Lee Lee Wong, David Sim, Oi Wah Liew, Ruiyang Zou, Lihan Zhou, Robert N. Doughty, and M. Lund
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Male ,Oncology ,medicine.medical_specialty ,medicine.drug_class ,030204 cardiovascular system & hematology ,Ventricular Function, Left ,03 medical and health sciences ,0302 clinical medicine ,Internal medicine ,Natriuretic Peptide, Brain ,medicine ,Natriuretic peptide ,Humans ,Circulating MicroRNA ,030212 general & internal medicine ,Aged ,Heart Failure ,Principal Component Analysis ,Singapore ,Ejection fraction ,business.industry ,Gene Expression Profiling ,Area under the curve ,Stroke Volume ,Middle Aged ,medicine.disease ,Echocardiography, Doppler ,Peptide Fragments ,MicroRNAs ,Area Under Curve ,Heart failure ,Cohort ,Biomarker (medicine) ,Female ,Cardiology and Cardiovascular Medicine ,Heart failure with preserved ejection fraction ,business ,Biomarkers ,New Zealand - Abstract
Background Clinicians need improved tools to better identify nonacute heart failure with preserved ejection fraction (HFpEF). Objectives The purpose of this study was to derive and validate circulating microRNA signatures for nonacute heart failure (HF). Methods Discovery and validation cohorts (N = 1,710), comprised 903 HF and 807 non-HF patients from Singapore and New Zealand (NZ). MicroRNA biomarker panel discovery in a Singapore cohort (n = 546) was independently validated in a second Singapore cohort (Validation 1; n = 448) and a NZ cohort (Validation 2; n = 716). Results In discovery, an 8-microRNA panel identified HF with an area under the curve (AUC) 0.96, specificity 0.88, and accuracy 0.89. Corresponding metrics were 0.88, 0.66, and 0.77 in Validation 1, and 0.87, 0.58, and 0.74 in Validation 2. Combining microRNA panels with N-terminal pro–B-type natriuretic peptide (NT-proBNP) clearly improved specificity and accuracy from AUC 0.96, specificity 0.91, and accuracy 0.90 for NT-proBNP alone to corresponding metrics of 0.99, 0.99, and 0.93 in the discovery and 0.97, 0.96, and 0.93 in Validation 1. The 8-microRNA discovery panel distinguished HFpEF from HF with reduced ejection fraction with AUC 0.81, specificity 0.66, and accuracy 0.72. Corresponding metrics were 0.65, 0.41, and 0.56 in Validation 1 and 0.65, 0.41, and 0.62 in Validation 2. For phenotype categorization, combined markers achieved AUC 0.87, specificity 0.75, and accuracy 0.77 in the discovery with corresponding metrics of 0.74, 0.59, and 0.67 in Validation 1 and 0.72, 0.52, and 0.68 in Validation 2, as compared with NT-proBNP alone of AUC 0.71, specificity 0.46, and accuracy 0.62 in the discovery; with corresponding metrics of 0.72, 0.44, and 0.57 in Validation 1 and 0.69, 0.48, and 0.66 in Validation 2. Accordingly, false negative (FN) (81% Singapore and all NZ FN cases were HFpEF) as classified by a guideline-endorsed NT-proBNP ruleout threshold, were correctly reclassified by the 8-microRNA panel in the majority (72% and 88% of FN in Singapore and NZ, respectively) of cases. Conclusions Multi-microRNA panels in combination with NT-proBNP are highly discriminatory and improved specificity and accuracy in identifying nonacute HF. These findings suggest potential utility in the identification of nonacute HF, where clinical assessment, imaging, and NT-proBNP may not be definitive, especially in HFpEF.
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- 2019
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7. Circulating microRNAs in heart failure with reduced and preserved left ventricular ejection fraction
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Wong, Lee Lee, Armugam, Arunmozhiarasi, Sepramaniam, Sugunavathi, Karolina, Dwi Setyowati, Lim, Kai Ying, Lim, Jia Yuen, Chong, Jenny P. C., Ng, Jessica Y. X., Chen, Yei-Tsung, Chan, Michelle M. Y., Chen, Zhaojin, Yeo, Poh Shuan D., Ng, Tze P., Ling, Lieng H., Sim, David, Leong, Kui Toh G., Ong, Hean Y., Jaufeerally, Fazlur, Wong, Raymond, Chai, Ping, Low, Adrian F., Lam, Carolyn S. P., Jeyaseelan, Kandiah, and Richards, Arthur Mark
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- 2015
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8. Teaching office report writing to mature students using the genre approach : a case study.
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Toh, G. and Setobol, B.
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- 1998
9. Keeping the conversation going : perceptions on teaching conversation to EFL learners.
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Noor, E. E. and Toh, G.
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- 1998
10. Growth differentiation factor 15, ST2, high-sensitivity troponin T, and N-terminal pro brain natriuretic peptide in heart failure with preserved vs. reduced ejection fraction
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Santhanakrishnan, Rajalakshmi, Chong, Jenny P.C., Ng, Tze P., Ling, Lieng H., Sim, David, Toh G. Leong, Kui, Shuan D. Yeo, Poh, Ong, Hean Y., Jaufeerally, Fazlur, Wong, Raymond, Chai, Ping, Low, Adrian F., Richards, Arthur Mark, and Lam, Carolyn S.P.
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- 2012
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11. Eucledian Geometry using IFS
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Tan, Daniel T. H., primary, Toh, G. N., additional, Liong, L. C., additional, and Yek, S. K., additional
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- 1995
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12. Growth differentiation factor 15 in heart failure with preserved vs. reduced ejection fraction
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Tze Pin Ng, Hean Yee Ong, Rajalakshmi Santhanakrishnan, Oi Wah Liew, Adrian F. Low, Arthur Mark Richards, Carolyn S.P. Lam, Poh Shuan Daniel Yeo, Michelle Chan, Lieng H. Ling, Kui Toh G. Leong, Jenny P.C. Chong, Raymond Ching-Chiew Wong, Bee Choo Tai, Zhaojin Chen, David Sim, Fazlur Jaufeerally, and Ping Chai
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medicine.medical_specialty ,Ejection fraction ,business.industry ,Hazard ratio ,Atrial fibrillation ,030204 cardiovascular system & hematology ,medicine.disease ,Confidence interval ,03 medical and health sciences ,0302 clinical medicine ,Blood pressure ,Heart failure ,Internal medicine ,medicine ,Cardiology ,030212 general & internal medicine ,GDF15 ,Cardiology and Cardiovascular Medicine ,Heart failure with preserved ejection fraction ,business - Abstract
Aim Growth differentiation factor 15 (GDF15) is a cytokine highly expressed in states of inflammatory stress. We aimed to study the clinical correlates and prognostic significance of plasma GDF15 in heart failure with preserved ejection fraction (HFpEF) vs. reduced ejection fraction(HFrEF), compared with N-terminal pro-brain natriuretic peptide (NT-proBNP), an indicator of haemodynamic wall stress. Methods Plasma GDF15 and NT-proBNP were prospectively measured in 916 consecutive patients with HFrEF (EF
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- 2015
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13. Thymosin Beta-4 Is Elevated in Women With Heart Failure With Preserved Ejection Fraction
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Leroy S. Pakkiri, Adrian F. Low, Li-Ming Gan, Ratan Bhat, Pia Davidsson, Tze Pin Ng, Ann-Sofi Söderling, Daniel P S Yeo, Kui‐Toh G. Leong, Hean Yee Ong, Mathias Liljeblad, Kristy Purnamawati, Siew Pang Chan, Lieng-Hsi Ling, A. Mark Richards, Chester L. Drum, Warren K. Y. Tan, Carolyn S.P. Lam, Jenny P.C. Chong, Raymond Wong, Oi-Wah Liew, Fazlur Jaufeerally, Ping Chai, and David Sim
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0301 basic medicine ,Male ,medicine.medical_specialty ,Cardiac biomarkers ,030204 cardiovascular system & hematology ,Mass Spectrometry ,Gene product ,03 medical and health sciences ,0302 clinical medicine ,Sex Factors ,Internal medicine ,cardiac biomarkers ,thymosin beta‐4 ,Medicine ,Humans ,Prospective Studies ,liquid chromatography‐mass spectrometry ,Aged ,Original Research ,Heart Failure ,business.industry ,Microfilament Proteins ,Stroke Volume ,Middle Aged ,CD40/CD40L ,medicine.disease ,Prognosis ,Thymosin beta-4 ,Thymosin ,030104 developmental biology ,Endocrinology ,Cd40 cd40l ,Heart failure ,Plasma concentration ,Disease Progression ,biomarker ,proximity extension assay ,Female ,Cardiology and Cardiovascular Medicine ,business ,Heart failure with preserved ejection fraction ,Biomarkers ,Chromatography, Liquid ,Follow-Up Studies - Abstract
Background Thymosin beta‐4 ( TB 4) is an X‐linked gene product with cardioprotective properties. Little is known about plasma concentration of TB 4 in heart failure ( HF ), and its relationship with other cardiovascular biomarkers. We sought to evaluate circulating TB 4 in HF patients with preserved ( HF p EF ) or reduced ( HF r EF ) ejection fraction compared to non‐ HF controls. Methods and Results TB 4 was measured using a liquid chromatography and mass spectrometry assay in age‐ and sex‐matched HF p EF (n=219), HF r EF (n=219) patients, and controls (n=219) from a prospective nationwide study. Additionally, a 92‐marker multiplex proximity extension assay was measured to identify biomarker covariates. Compared with controls, plasma TB 4 was elevated in HF p EF (985 [421–1723] ng/mL versus 1401 [720–2379] ng/mL, P HF r EF (1106 [556–1955] ng/mL, P =0.642). Stratifying by sex, only women (1623 [1040–2625] ng/mL versus 942 [386–1891] ng/mL, P P =1.0), had significantly elevated TB 4 in the setting of HF p EF . Adjusted for New York Heart Association class, N‐terminal pro B‐type natriuretic peptide, age, and myocardial infarction, hazard ratio to all‐cause mortality is significantly higher in women with elevated TB 4 (1.668, P =0.036), but not in men (0.791, P =0.456) with HF . TB 4 is strongly correlated with a cluster of 7 markers from the proximity extension assay panel, which are either X‐linked, regulated by sex hormones, or involved with NF ‐κB signaling. Conclusions We show that plasma TB 4 is elevated in women with HF p EF and has prognostic information. Because TB 4 can preserve EF in animal studies of cardiac injury, the relation of endogenous, circulating TB 4 to X chromosome biology and differential outcomes in female heart disease warrants further study.
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- 2017
14. Thymosin Beta‐4 Is Elevated in Women With Heart Failure With Preserved Ejection Fraction
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Drum, Chester L., primary, Tan, Warren K. Y., additional, Chan, Siew‐Pang, additional, Pakkiri, Leroy S., additional, Chong, Jenny P. C., additional, Liew, Oi‐Wah, additional, Ng, Tze‐Pin, additional, Ling, Lieng‐Hsi, additional, Sim, David, additional, Leong, Kui‐Toh G., additional, Yeo, Daniel P. S., additional, Ong, Hean‐Yee, additional, Jaufeerally, Fazlur, additional, Wong, Raymond C. C., additional, Chai, Ping, additional, Low, Adrian F., additional, Davidsson, Pia, additional, Liljeblad, Mathias, additional, Söderling, Ann‐Sofi, additional, Gan, Li‐Ming, additional, Bhat, Ratan V., additional, Purnamawati, Kristy, additional, Lam, Carolyn S. P., additional, and Richards, A. Mark, additional
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- 2017
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15. Combinational concentration gradient confinement through stagnation flow
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Chun Yang, Toh G. G. Alicia, Zhiping Wang, and Nam-Trung Nguyen
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0301 basic medicine ,Mass transport ,Materials science ,Microfluidics ,Biomedical Engineering ,Bioengineering ,Nanotechnology ,General Chemistry ,Mechanics ,Stagnation point ,Biochemistry ,Volumetric flow rate ,03 medical and health sciences ,030104 developmental biology ,Shear (geology) ,High flow ,Concentration gradient - Abstract
Concentration gradient generation in microfluidics is typically constrained by two conflicting mass transport requirements: short characteristic times (τ) for precise temporal control of concentration gradients but at the expense of high flow rates and hence, high flow shear stresses (σ). To decouple the limitations from these parameters, here we propose the use of stagnation flows to confine concentration gradients within large velocity gradients that surround the stagnation point. We developed a modified cross-slot (MCS) device capable of feeding binary and combinational concentration sources in stagnation flows. We show that across the velocity well, source-sink pairs can form permanent concentration gradients. As source-sink concentration pairs are continuously supplied to the MCS, a permanently stable concentration gradient can be generated. Tuning the flow rates directly controls the velocity gradients, and hence the stagnation point location, allowing the confined concentration gradient to be focused. In addition, the flow rate ratio within the MCS rapidly controls (τ ∼ 50 ms) the location of the stagnation point and the confined combinational concentration gradients at low flow shear (0.2 Pa < σ < 2.9 Pa). The MCS device described in this study establishes the method for using stagnation flows to rapidly generate and position low shear combinational concentration gradients for shear sensitive biological assays.
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- 2015
16. Growth differentiation factor 15 in heart failure with preserved vs. reduced ejection fraction
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Michelle M Y, Chan, Rajalakshmi, Santhanakrishnan, Jenny P C, Chong, Zhaojin, Chen, Bee Choo, Tai, Oi Wah, Liew, Tze Pin, Ng, Lieng H, Ling, David, Sim, Kui Toh G, Leong, Poh Shuan Daniel, Yeo, Hean-Yee, Ong, Fazlur, Jaufeerally, Raymond Ching-Chiew, Wong, Ping, Chai, Adrian F, Low, Arthur M, Richards, and Carolyn S P, Lam
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Heart Failure ,Inflammation ,Male ,Singapore ,Growth Differentiation Factor 15 ,Stroke Volume ,Middle Aged ,Prognosis ,Patient Readmission ,Survival Analysis ,Peptide Fragments ,ROC Curve ,Natriuretic Peptide, Brain ,Humans ,Female ,Biomarkers ,Aged ,Proportional Hazards Models - Abstract
Growth differentiation factor 15 (GDF15) is a cytokine highly expressed in states of inflammatory stress. We aimed to study the clinical correlates and prognostic significance of plasma GDF15 in heart failure with preserved ejection fraction (HFpEF) vs. reduced ejection fraction(HFrEF), compared with N-terminal pro-brain natriuretic peptide (NT-proBNP), an indicator of haemodynamic wall stress.Plasma GDF15 and NT-proBNP were prospectively measured in 916 consecutive patients with HFrEF (EF50%; n = 730) and HFpEF (EF ≥50%; n = 186), and measured again at 6 months in 488 patients. Patients were followed up for a composite outcome of death or first HF rehospitalization.Median GDF15baseline values were similarly elevated in HFpEF [2862 (1812 represent the 25th percentile and 4176 represent the 75th percentile) ng/L] and HFrEF [2517 (1555, 4030) ng/L] (P = 0.184), whereas NT-proBNP was significantly lower in HFpEF than HFrEF (1119 ng/L vs. 2335 ng/L, P 0.001). Independent correlates of GDF15baseline were age, systolic blood pressure, New York Heart Association (NYHA) class, diabetes, atrial fibrillation, sodium, haemoglobin, creatinine, diuretic therapy, high sensitivity troponin T (hsTnT) and NT-proBNP (all P 0.05). During a median follow-up of 23 months, there were 379 events (307 HFrEF, 72 HFpEF). GDF15 remained a significant independent predictor for composite outcome even after adjusting for important clinical predictors including hsTnT and NT-proBNP (adjusted hazard ratio 1.76 per 1 Ln U, 95% confidence interval 1.39-2.21; P 0.001), regardless of HF group (Pinteraction = 0.275). GDF15baseline provided incremental prognostic value when added to clinical predictors, hsTnT and NT-proBNP (area under receiver operating characteristic curve increased from 0.720 to 0.740, P 0.019), with a net reclassification improvement of 0.183 (P = 0.004). Patients with ≥20% GDF156months increase had higher risk for composite outcome (adjusted hazard ratio 1.68, 95% confidence interval 1.15-2.45; P = 0.007) compared with those with GDF156months within ± 20% of baseline.The similarly elevated levels and independent prognostic utility of GDF15 in HFrEF and HFpEF suggest that beyond haemodynamic stress (NT-proBNP), inflammatory injury (GDF15) may play an important role in both HF syndromes.
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- 2015
17. Combinational concentration gradient confinement through stagnation flow
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Alicia, Toh G. G., primary, Yang, Chun, additional, Wang, Zhiping, additional, and Nguyen, Nam-Trung, additional
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- 2016
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18. Growth differentiation factor 15, ST2, high-sensitivity troponin T, and N-terminal pro brain natriuretic peptide in heart failure with preserved vs. reduced ejection fraction
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Fazlur Jaufeerally, Arthur Mark Richards, Lieng H. Ling, Hean Yee Ong, Poh Shuan D. Yeo, Ping Chai, David Sim, Adrian F. Low, Kui Toh G. Leong, Tze P. Ng, Rajalakshmi Santhanakrishnan, Jenny P.C. Chong, Raymond Wong, and Carolyn S.P. Lam
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Male ,medicine.medical_specialty ,Growth Differentiation Factor 15 ,medicine.drug_class ,Receptors, Cell Surface ,Electrocardiography ,Necrosis ,Troponin T ,Internal medicine ,Natriuretic Peptide, Brain ,medicine ,Natriuretic peptide ,Humans ,Prospective Studies ,Heart Failure ,Inflammation ,Singapore ,Ejection fraction ,medicine.diagnostic_test ,Ventricular Remodeling ,business.industry ,Area under the curve ,Stroke Volume ,Middle Aged ,medicine.disease ,Interleukin-1 Receptor-Like 1 Protein ,Echocardiography, Doppler ,Peptide Fragments ,ROC Curve ,Heart failure ,Area Under Curve ,Case-Control Studies ,Cardiology ,Female ,GDF15 ,Cardiology and Cardiovascular Medicine ,Heart failure with preserved ejection fraction ,business ,Biomarkers - Abstract
Aims Growth differentiation factor 15 (GDF15), ST2, high-sensitivity troponin T (hsTnT), and N-terminal pro brain natriuretic peptide (NT-proBNP) are biomarkers of distinct mechanisms that may contribute to the pathophysiology of heart failure (HF) [inflammation (GDF15); ventricular remodelling (ST2); myonecrosis (hsTnT); and wall stress (NT-proBNP)]. Methods and results We compared circulating levels of GDF15, ST2, hsTnT, and NT-proBNP, as well as their combinations, in compensated patients with clinical HF with reduced ejection fraction (HFREF) (n = 51), HF with preserved ejection fraction (HFPEF) (n= 50), and community-based controls (n = 50). Compared with controls, patients with HFPEF and HFREF had higher median levels of GDF15 (540 pg/mL vs. 2529 and 2672 pg/mL, respectively), hsTnT (3.7 pg/mL vs. 23.7 and 35.6 pg/mL), and NT-proBNP (69 pg/mL vs. 942 and 2562 pg/mL), but not ST2 (27.6 ng/mL vs. 31.5 and 35.3 ng/mL), adjusting for clinical covariates. In receiver operating characteristic curve analyses, NT-proBNP distinguished HFREF from controls with an area under the curve (AUC) of 0.987 (P < 0.001); GDF15 distinguished HFPEF from controls with an AUC of 0.936 (P < 0.001); and the combination of NT-proBNP and GDF15 distinguished HFPEF from controls with an AUC of 0.956 (P < 0.001). NT-proBNP and hsTnT levels were higher in HFREF than in HFPEF (adjusted P < 0.04). The NT-proBNP:GDF15 ratio distinguished between HFPEF and HFREF with the largest AUC (0.709; P < 0.001). Conclusions Our study provides comparative data on physiologically distinct circulating biomarkers in HFPEF, HFREF, and controls from the same community. These data suggest a prominent role for myocardial injury (hsTnT) with increased wall stress (NT-proBNP) in HFREF, and systemic inflammation (GDF15) in HFREF
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- 2012
19. HEART FAILURE PROGRAM IN AN ASIAN MULTI-ETHNIC ACUTE HEART FAILURE COHORT AND OUTCOMES
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Kui Toh G. Leong, Yan Cao, and M. Tan
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medicine.medical_specialty ,Framingham Risk Score ,business.industry ,Internal medicine ,Heart failure ,Emergency medicine ,Cohort ,medicine ,Ethnic group ,Cardiology ,business ,medicine.disease ,Cardiology and Cardiovascular Medicine - Published
- 2011
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20. Growth differentiation factor 15 in heart failure with preserved vs. reduced ejection fraction
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Chan, Michelle M.Y., primary, Santhanakrishnan, Rajalakshmi, additional, Chong, Jenny P.C., additional, Chen, Zhaojin, additional, Tai, Bee Choo, additional, Liew, Oi Wah, additional, Ng, Tze Pin, additional, Ling, Lieng H., additional, Sim, David, additional, Leong, Kui Toh G., additional, Yeo, Poh Shuan Daniel, additional, Ong, Hean-Yee, additional, Jaufeerally, Fazlur, additional, Wong, Raymond Ching-Chiew, additional, Chai, Ping, additional, Low, Adrian F., additional, Richards, Arthur M., additional, and Lam, Carolyn S.P., additional
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- 2015
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21. SUN-PP192: Assessment of Nutritional Status of Elective Colorectal Cancer Patients
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Toh, G., primary, Cheng, H., additional, and Page, B., additional
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- 2015
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22. HEART FAILURE PROGRAM IN AN ASIAN MULTI-ETHNIC ACUTE HEART FAILURE COHORT AND OUTCOMES
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Leong, Kui Toh G., primary, Cao, Yan, additional, and Tan, M., additional
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- 2011
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23. Operating reserve of thermal unit systems with interruptible loads
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Toh, G. K., primary and Gooi, H. B., additional
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- 2009
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24. Thermal unit systems with wind energy penetration
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Toh, G. K., primary and Gooi, H. B., additional
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- 2009
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25. STUDIES ON MECHANICAL AND THERMAL PROPERTIES OF LOW DENSITY POLYETHYLENE/TITANIUM DIOXIDE COMPOSITES IN BINARY SYSTEM AND TERNARY SYSTEM: EFFECT OF GRAPHENE OXIDE.
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Toh, G. Y., Ong Hui Lin, Lim, H. N., Huang, N. M., Akil, Hazizan Md., and Santos, Gil Nonato C.
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LOW density polyethylene , *TITANIUM dioxide , *BINARY metallic systems , *TERNARY alloys , *GRAPHENE oxide , *MECHANICAL properties of polymers , *THERMAL properties of polymers - Abstract
This study reports on a polymer composites which use low density polyethylene (LDPE) as polymer matrix, titanium dioxide (TiO2) and graphene oxide (GO) as fillers. The results between mechanical and thermal properties of binary system and ternary system composites are being compared with the effect of graphene oxide. The preparation of TiO2/GO fillers is done by physical mixing with ratio 1:1 of titanium dioxide and graphene oxide which was prepared using simplified Hummer's method. 5 wt% and 10 wt% of the fillers are then melt mixed with LDPE respectively at 160°C, rotor speed of 60rpm for 10 minutes using Brabender machine. The results confirmed that the incorporation of GO in ternary system showed improvement in tensile and flexural properties compared to binary system composites. For thermal behaviour, ternary system composites showed higher cyrstallinity in differential scanning calorimety (DSC) study than the binary composites, however ternary system composites has slightly decrease for the thermal stability in thermogravimetric analysis (TGA). The investigation on the tensile fractured surface using scanning electron microscope (SEM) showed better interfacial adhesion in ternary system compared to the binary system. Thus, results revealed that polymer composite based on ternary system displayed a remarkable enhancement in mechanical properties which make it a good candidate in food packaging application. [ABSTRACT FROM AUTHOR]
- Published
- 2015
26. Adopting Team-Based Learning for In-Service Teachers: A Case Study
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Zachary Walker, Toh Guo Zheng, Redante Mendoza, and Elise Lee
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Team-Based Learning ,Pedagogy ,Teamwork ,Teacher Education ,Theory and practice of education ,LB5-3640 - Abstract
Team-based learning (TBL) is an instructional pedagogy that has gained recent popularity due to its effectiveness in disciplines such as medicine and business. However, TBL has not been widely adopted in teacher education based on reviews of research and practitioner based literature. The purpose of this case study was to assess the implementation and effectiveness of TBL in a Singapore teaching institute with thirty in-service teachers. Quantitative and qualitative data was collected from teachers about their experience learning through TBL. Research findings revealed that 1) teachers generally perceived TBL to be a positive experience, although several areas for improvement were suggested; 2) quality of scores through TBL was high, with team scores being significantly higher than individual scores. The findings from this study have the potential to guide the design of future TBL courses in education.
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- 2017
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27. A Fe2O3 - SnO2 based gas sensors for ethanol
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Ooi Kiang Tan, Zhu, W., Yao, K., Toh, G. S., Teh, S. Y., and Jiang, J. Z.
28. Mutations within folate metabolising genes of Plasmodium falciparum in Cameroon
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Wilfred Mbacham, Evehe, M. -S B., Netongo, P. M., Ali, I. M., Nfor, E. N., Akaragwe, A. I., Mimche, P. N., Nji, A., Djoko, C. F., Tawe, B., Gawa, B., Asongna, T., Toh, G. B., Atogho-Tieudeu, B., Nge, N., Ebeng, R., Mokube, J. A., Kuaban, C., Bickii, J., Penlap, V., Titanji, V. P., and Njikam, N.
29. Applying Triz for Production Quality Improvement
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Swee Nikalus Shu Luing, Toh Guat Guan, Yip Mum Wai, Keong Chee Sheng, and Tai See Chew
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Engineering (General). Civil engineering (General) ,TA1-2040 - Abstract
This paper aims to provide a thorough analysis on the application of TRIZ in improving the quality of canned food production. TRIZ tools such as engineering systems analysis, function analysis, cause and effect chain analysis, By-separation model and 40 Inventive Principles are applied in order to discover some feasible and elegant solutions to alleviate the problem. Findings revealed that the rejected canned products on the conveyor belt will be isolated or picked up with other good condition canned products which are lined up very closely to the rejected cans; though the visioning system is able detect the fault printing on the canned product. The main root cause is that the rejected canned product is picked up with other canned products in good condition because all cans are lined up on the belt and are very close to each other or having no gaps between the cans. Conversely, all cans on the conveyor belts are required to be very close to each other to avoid collisions that may damage the cans. The root cause is solved by applying function analysis, By-separation tool and Inventive Principles. Therefore, it can be concluded that TRIZ is a powerful tool in inventive problem solving.
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- 2017
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30. Effects of polypropylene methyl polyhedral oligomeric silsesquioxanes and polypropylene-grafted maleic anhydride compatibilizers on the properties of palm kernel shell reinforced polypropylene biocomposites
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Muhammad Safwan Mohaiyiddin, Ong Hui Lin, Hazizan Md Akil, Toh Guat Yee, Nik Nur Azza Nik Adik, and Al Rey Villagracia
- Subjects
biocomposites ,palm kernel shell ,polypropylene-methyl-polyhedral oligomeric silsesquioxane ,mechanical properties ,thermal behavior ,Chemical technology ,TP1-1185 - Abstract
Abstract The effects of the polypropylene-grafted maleic anhydride (PP-g-MAH) and polypropylene methyl polyhedral oligomeric silsesquioxane (PP-POSS) compatibilizers on the mechanical, thermal and physical properties of palm kernel shell (PKS) reinforced polypropylene (PP) were investigated. The production of PP/PKS biocomposites was performed by melt mixing using Brabender Internal Mixer. Mechanical test results showed that the biocomposites with PP-g-MAH have better tensile strength compared to biocomposites with or without PP-POSS. The results also showed an increase in the tensile strength and elongation at break when compatibilizers were added. Polypropylene-grafted maleic anhydride improved the Young’s modulus of the biocomposites, but PP-POSS reduced it. Moreoever, adding compatibilizers in biocomposites reduced the water absorption of the biocomposites. The compatibilizers improved the nucleating ability of filler in the composites. The PP-g-MAH compatibilizer provided better performance in improving nucleating ability to biocomposites compared to PP-POSS.
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31. Fast Photon-Mediated Entanglement of Continuously Cooled Trapped Ions for Quantum Networking.
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O'Reilly J, Toh G, Goetting I, Saha S, Shalaev M, Carter AL, Risinger A, Kalakuntla A, Li T, Verma A, and Monroe C
- Abstract
We entangle two cotrapped atomic barium ion qubits by collecting single visible photons from each ion through in vacuo 0.8 NA objectives, interfering them through an integrated fiber beam splitter and detecting them in coincidence. This projects the qubits into an entangled Bell state with an observed fidelity lower bound of F>94%. We also introduce an ytterbium ion for sympathetic cooling to remove the need for recooling interruptions and achieve a continuous entanglement rate of 250 s^{-1}.
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- 2024
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32. Exploring the Feasibility of Estimating Intraocular Pressure Using Vibrational Response of the Eye: A Methodological Approach.
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Jeon S, Toh G, Park J, and Lee WJ
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- Animals, Swine, Eye, Glaucoma physiopathology, Glaucoma diagnosis, Feasibility Studies, Humans, Intraocular Pressure physiology, Vibration, Tonometry, Ocular methods
- Abstract
This study addresses the limitations of current tonometry techniques by exploring vibroacoustic properties for estimating intraocular pressure (IOP), a key diagnostic parameter for monitoring glaucoma-a significant risk factor for vision loss. Utilizing vivo porcine eyeballs, we investigated the relationship between IOP and the nonlinear vibration transfer function ratio (NVTFR). Through applying varying vibration levels and analyzing responses with transfer function analysis and univariate regression, we identified a strong negative correlation between NVTFR and IOP, evidenced by a Pearson correlation coefficient of -0.8111 and significant results from generalized linear model (GLM) regression ( p -value < 0.001). These findings indicate the potential of NVTFR as a vital indicator of IOP changes. Our study highlights the feasibility of using vibroacoustic properties, specifically NVTFR, to measure IOP. While further refinement is necessary for in vivo application, this approach opens new possibilities for non-invasive and patient-friendly IOP monitoring, potentially enhancing ophthalmology diagnostic techniques and providing a foundation for future research and development in this critical area.
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- 2024
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33. Ion trap with in-vacuum high numerical aperture imaging for a dual-species modular quantum computer.
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Carter AL, O'Reilly J, Toh G, Saha S, Shalaev M, Goetting I, and Monroe C
- Abstract
Photonic interconnects between quantum systems will play a central role in both scalable quantum computing and quantum networking. Entanglement of remote qubits via photons has been demonstrated in many platforms; however, improving the rate of entanglement generation will be instrumental for integrating photonic links into modular quantum computers. We present an ion trap system that has the highest reported free-space photon collection efficiency for quantum networking. We use a pair of in-vacuum aspheric lenses, each with a numerical aperture of 0.8, to couple 10(1)% of the 493 nm photons emitted from a 138Ba+ ion into single-mode fibers. We also demonstrate that proximal effects of the lenses on the ion position and motion can be mitigated., (© 2024 Author(s). Published under an exclusive license by AIP Publishing.)
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- 2024
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34. Diagnostic performance of wide-field optical coherence tomography angiography for high myopic glaucoma.
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Hong RK, Kim JH, Toh G, Na KI, Seong M, and Lee WJ
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- Humans, Tomography, Optical Coherence methods, Angiography, Fluorescein Angiography methods, Retinal Vessels, Glaucoma, Open-Angle diagnostic imaging, Glaucoma diagnostic imaging, Optic Disk, Myopia diagnostic imaging
- Abstract
Diagnosing and monitoring glaucoma in high myopic (HM) eyes are becoming very important; however, it is challenging to diagnose this condition. This study aimed to evaluate the diagnostic ability of wide-field optical coherence tomography angiography (WF-OCTA) maps for the detection of glaucomatous damage in eyes with HM and to compare the diagnostic ability of WF-OCTA maps with that of conventional imaging approaches, including swept-source optical coherence tomography (SS-OCT) wide-field maps. In this retrospective observational study, a total 62 HM-healthy eyes and 140 HM eyes with open-angle glaucoma were included. Patients underwent a comprehensive ocular examination, including SS-OCT wide-field and 12 × 12 WF-OCTA scans. The WF-OCTA map represents the peripapillary and macular superficial vascular density maps. Glaucoma specialists determined the presence of glaucomatous damage in HM eyes by reading the WF-OCTA map and comparing its sensitivity and specificity with those of conventional SS-OCT images. The sensitivity and specificity of 12 × 12 WF-OCTA scans for HM-glaucoma diagnosis were 87.28% and 86.94%, respectively, while, the sensitivity and specificity of SS-OCT wide-field maps for HM-glaucoma diagnosis were 87.49% and 80.51%, respectively. The specificity of the WF-OCTA map was significantly higher than that of the SS-OCT wide-field map (p < 0.05). The sensitivity of the WF-OCTA map was comparable with that of the SS-OCT wide-field map (p = 0.078). The WF-OCTA map showed good diagnostic ability for discriminating HM-glaucomatous eyes from HM-healthy eyes. As a complementary method to an alternative imaging modality, WF-OCTA mapping can be a useful tool for the detection of HM glaucoma., (© 2024. The Author(s).)
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- 2024
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35. Correction to: Electroencephalographic alpha oscillation as first manifestation of brain restoration after resuscitation.
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Cha JH, Gu K, Toh G, Park J, Na JY, and Moon JH
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- 2022
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36. Electroencephalographic alpha oscillation as first manifestation of brain restoration after resuscitation.
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Cha JH, Gu K, Toh G, Park J, Na JY, and Moon JH
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- Brain diagnostic imaging, Head, Humans, Electroencephalography, Resuscitation
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- 2022
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37. Digital interventions for subjective and objective social isolation among individuals with mental health conditions: a scoping review.
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Toh G, Pearce E, Vines J, Ikhtabi S, Birken M, Pitman A, and Johnson S
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- Humans, Social Isolation psychology, Mental Disorders therapy, Mental Health
- Abstract
Background: Social isolation encompasses subjective and objective concepts. Both are associated with negative health consequences and are more prevalent among people with mental health problems than among the general population. To alleviate social isolation, digital interventions have potential as accessible alternatives or adjuncts to face-to-face interventions. This scoping review aimed to describe the types of digital interventions evaluated for feasibility, acceptability and effectiveness in alleviating social isolation among individuals with mental health problems, and to present an overview of the quantitative evidence yielded to inform future intervention design., Methods: We searched five electronic databases for quantitative and mixed methods studies published between January 2000 and July 2020. Studies were included if they evaluated digital interventions for individuals with mental health conditions, had subjective and/or objective social isolation as their primary outcome, or as one of their outcomes if no primary outcome was specified. Feasibility studies were included if feasibility outcomes were the primary outcomes and social isolation was among their secondary outcomes. A narrative synthesis was conducted to present our findings. The protocol was registered on Open Science Framework (doi: https://doi.org/10.17605/OSF.IO/CNX8A )., Results: Thirty-two studies were included for our review: 16 feasibility studies, seven single-group studies and nine effectiveness trials. There was great variation in the interventions, study designs and sample populations. Interventions included web-based programmes, phone-based programmes, blended interventions, socially assistive robots and virtual reality interventions. Many were feasibility studies, or otherwise not fully powered to detect an effect if one were present, thus preventing clear conclusions about clinical effectiveness. Satisfactory feasibility outcomes indicated potential for future trials to assess these interventions., Conclusion: Our scoping review identified a range of digital approaches utilized to alleviate social isolation among individuals with mental health disorders. Conclusions regarding clinical effectiveness cannot be reached due to variability of approaches and lack of large-scale randomized controlled trials. To make clear recommendations for digital social isolation interventions, future research needs to be based on rigorous methods and larger samples. Future studies should also focus on utilizing theory-driven approaches and improving existing approaches to advance the field., (© 2022. The Author(s).)
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- 2022
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38. The experience of loneliness among people with a "personality disorder" diagnosis or traits: a qualitative meta-synthesis.
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Ikhtabi S, Pitman A, Toh G, Birken M, Pearce E, and Johnson S
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- Emotions, Humans, Personality Disorders diagnosis, Qualitative Research, Borderline Personality Disorder, Loneliness psychology
- Abstract
Background: Loneliness is prevalent among people with a "personality disorder" diagnosis or who have related personality traits, but the experience of loneliness among people with "personality disorder" diagnoses/traits has not been well described. A qualitative approach has potential to help understand the experience of loneliness among people with "personality disorder" diagnoses/traits, and to develop interventions that promote recovery. We therefore aimed to synthesise the qualitative literature relevant to this topic., Method: We conducted a meta-synthesis of qualitative studies exploring the subjective experience of loneliness as reported by people with "personality disorder" diagnoses/traits. We searched four databases using pre-formulated search terms, selected eligible articles, appraised the quality of each, and analyzed data from eligible studies using thematic synthesis., Result: We identified 39 articles that described the experience of loneliness in people with "personality disorder" diagnoses/traits. From extracted data, we identified seven themes: (1) disconnection and emptiness: a "haunting alienation", (2) alienation arising from childhood experiences, (3) thwarted desire for closeness and connection, (4) paradox: for both closeness and distance, (5) experiences of existential loneliness, (6) recovery, embedded in a social world, and (7) group therapy: a setback. Our results suggest that for our sample early alienating and traumatic experiences may pave the way for experiences of loneliness, which further exacerbate "personality disorder" symptoms and distress., Conclusion: Despite describing a need to belong and efforts to cope with unmet social needs, people with "personality disorder" diagnoses/traits (particularly "emotionally unstable personality disorder") report experiencing an intense disconnection from other people. This seems rooted in early adversities, reinforced by later traumatic experiences. Given the apparent salience of loneliness to people with "personality disorder" diagnoses/traits, interventions focused on helping people connect with others, which may include both psychological and social components, have potential to be beneficial in reducing loneliness and promoting recovery., (© 2022. The Author(s).)
- Published
- 2022
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39. Determination of the Scalar and Vector Polarizabilities of the Cesium 6s^{2}S_{1/2}→7s^{2}S_{1/2} Transition and Implications for Atomic Parity Nonconservation.
- Author
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Toh G, Damitz A, Tanner CE, Johnson WR, and Elliott DS
- Abstract
Using recent high-precision measurements of electric dipole matrix elements of atomic cesium, we make an improved determination of the scalar (α) and vector (β) polarizabilities of the cesium 6s^{2}S_{1/2}→7s^{2}S_{1/2} transition calculated through a sum-over-states method. We report values of α=-268.82(30)a_{0}^{3} and β=27.139(42)a_{0}^{3} with the highest precision to date. We find a discrepancy between our value of β and the past preferred value, resulting in a significant shift in the value of the weak charge Q_{w} of the cesium nucleus. Future work to resolve the differences in the polarizability will be critical for interpretation of parity nonconservation measurements in cesium, which have implications for physics beyond the standard model.
- Published
- 2019
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40. Understanding comorbidity among internalizing problems: Integrating latent structural models of psychopathology and risk mechanisms.
- Author
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Hankin BL, Snyder HR, Gulley LD, Schweizer TH, Bijttebier P, Nelis S, Toh G, and Vasey MW
- Subjects
- Anxiety diagnosis, Anxiety Disorders diagnosis, Cognition physiology, Defense Mechanisms, Depression diagnosis, Depressive Disorder diagnosis, Executive Function physiology, Humans, Temperament, Anxiety complications, Anxiety Disorders complications, Depression complications, Depressive Disorder complications
- Abstract
It is well known that comorbidity is the rule, not the exception, for categorically defined psychiatric disorders, and this is also the case for internalizing disorders of depression and anxiety. This theoretical review paper addresses the ubiquity of comorbidity among internalizing disorders. Our central thesis is that progress in understanding this co-occurrence can be made by employing latent dimensional structural models that organize psychopathology as well as vulnerabilities and risk mechanisms and by connecting the multiple levels of risk and psychopathology outcomes together. Different vulnerabilities and risk mechanisms are hypothesized to predict different levels of the structural model of psychopathology. We review the present state of knowledge based on concurrent and developmental sequential comorbidity patterns among common discrete psychiatric disorders in youth, and then we advocate for the use of more recent bifactor dimensional models of psychopathology (e.g., p factor; Caspi et al., 2014) that can help to explain the co-occurrence among internalizing symptoms. In support of this relatively novel conceptual perspective, we review six exemplar vulnerabilities and risk mechanisms, including executive function, information processing biases, cognitive vulnerabilities, positive and negative affectivity aspects of temperament, and autonomic dysregulation, along with the developmental occurrence of stressors in different domains, to show how these vulnerabilities can predict the general latent psychopathology factor, a unique latent internalizing dimension, as well as specific symptom syndrome manifestations., Competing Interests: The authors report no conflicts of interest.
- Published
- 2016
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41. cellXpress: a fast and user-friendly software platform for profiling cellular phenotypes.
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Laksameethanasan D, Tan R, Toh G, and Loo LH
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- Algorithms, Animals, Cell Line, Cluster Analysis, Humans, Cells cytology, Image Processing, Computer-Assisted, Phenotype, Software
- Abstract
Background: High-throughput, image-based screens of cellular responses to genetic or chemical perturbations generate huge numbers of cell images. Automated analysis is required to quantify and compare the effects of these perturbations. However, few of the current freely-available bioimage analysis software tools are optimized for efficient handling of these images. Even fewer of them are designed to transform the phenotypic features measured from these images into discriminative profiles that can reveal biologically meaningful associations among the tested perturbations., Results: We present a fast and user-friendly software platform called "cellXpress" to segment cells, measure quantitative features of cellular phenotypes, construct discriminative profiles, and visualize the resulting cell masks and feature values. We have also developed a suite of library functions to load the extracted features for further customizable analysis and visualization under the R computing environment. We systematically compared the processing speed, cell segmentation accuracy, and phenotypic-profile clustering performance of cellXpress to other existing bioimage analysis software packages or algorithms. We found that cellXpress outperforms these existing tools on three different bioimage datasets. We estimate that cellXpress could finish processing a genome-wide gene knockdown image dataset in less than a day on a modern personal desktop computer., Conclusions: The cellXpress platform is designed to make fast and efficient high-throughput phenotypic profiling more accessible to the wider biological research community. The cellXpress installation packages for 64-bit Windows and Linux, user manual, installation guide, and datasets used in this analysis can be downloaded freely from http://www.cellXpress.org.
- Published
- 2013
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42. Evaluation of BRCA1 and BRCA2 mutations and risk-prediction models in a typical Asian country (Malaysia) with a relatively low incidence of breast cancer.
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Thirthagiri E, Lee SY, Kang P, Lee DS, Toh GT, Selamat S, Yoon SY, Taib NA, Thong MK, Yip CH, and Teo SH
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- Adult, Algorithms, Breast Neoplasms epidemiology, DNA Mutational Analysis, Female, Gene Deletion, Humans, Incidence, Malaysia, Middle Aged, Ovarian Neoplasms diagnosis, Ovarian Neoplasms genetics, Predictive Value of Tests, Breast Neoplasms ethnology, Breast Neoplasms genetics, Genes, BRCA1, Genes, BRCA2, Mutation
- Abstract
Introduction: The cost of genetic testing and the limited knowledge about the BRCA1 and BRCA2 genes in different ethnic groups has limited its availability in medium- and low-resource countries, including Malaysia. In addition, the applicability of many risk-assessment tools, such as the Manchester Scoring System and BOADICEA (Breast and Ovarian Analysis of Disease Incidence and Carrier Estimation Algorithm) which were developed based on mutation rates observed primarily in Caucasian populations using data from multiplex families, and in populations where the rate of breast cancer is higher, has not been widely tested in Asia or in Asians living elsewhere. Here, we report the results of genetic testing for mutations in the BRCA1 or BRCA2 genes in a series of families with breast cancer in the multi-ethnic population (Malay, Chinese and Indian) of Malaysia., Method: A total of 187 breast cancer patients with either early-onset breast cancer (at age = 40 years) or a personal and/or family history of breast or ovarian cancer were comprehensively tested by full sequencing of both BRCA1 and BRCA2. Two algorithms to predict the presence of mutations, the Manchester Scoring System and BOADICEA, were evaluated., Results: Twenty-seven deleterious mutations were detected (14 in BRCA1 and 13 in BRCA2), only one of which was found in two unrelated individuals (BRCA2 490 delCT). In addition, 47 variants of uncertain clinical significance were identified (16 in BRCA1 and 31 in BRCA2). Notably, many mutations are novel (13 of the 30 BRCA1 mutations and 24 of the 44 BRCA2). We report that while there were an equal proportion of BRCA1 and BRCA2 mutations in the Chinese population in our study, there were significantly more BRCA2 mutations among the Malays. In addition, we show that the predictive power of the BOADICEA risk-prediction model and the Manchester Scoring System was significantly better for BRCA1 than BRCA2, but that the overall sensitivity, specificity and positive-predictive value was lower in this population than has been previously reported in Caucasian populations., Conclusion: Our study underscores the need for larger collaborative studies among non-Caucasian populations to validate the role of genetic testing and the use of risk-prediction models in ensuring that the other populations in the world may also benefit from the genomics and genetics era.
- Published
- 2008
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43. Role of the Saccharomyces cerevisiae Rad9 protein in sensing and responding to DNA damage.
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Toh GW and Lowndes NF
- Subjects
- Cell Cycle Proteins chemistry, Checkpoint Kinase 2, Models, Biological, Phosphorylation, Protein Serine-Threonine Kinases metabolism, Protein Structure, Tertiary, Cell Cycle Proteins physiology, DNA Damage, Saccharomyces cerevisiae metabolism, Saccharomyces cerevisiae Proteins
- Abstract
Eukaryotic cells have evolved surveillance mechanisms, known as DNA-damage checkpoints, that sense and respond to genome damage. DNA-damage checkpoint pathways ensure co-ordinated cellular responses to DNA damage, including cell cycle delays and activation of repair mechanisms. RAD9, from Saccharomyces cerevisiae, was the first damage checkpoint gene to be identified, although its biochemical function remained unknown until recently. This review examines briefly work that provides significant insight into how Rad9 activates the checkpoint signalling kinase Rad53.
- Published
- 2003
- Full Text
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