Browse publications by year: 2019

  1. Ching S, Chia YC, Chew BN, Soo MJ, Lim HM, Sulaiman WAW, et al.
    BMC Public Health, 2019 Nov 29;19(1):1602.
    PMID: 31783831 DOI: 10.1186/s12889-019-7922-7
    BACKGROUND: Information regarding the knowledge on the action to be taken during stroke and good recognition of stroke symptoms is mandatory in helping to plan out educational strategies to deliver health education to the community.

    METHODS: This is a cross-sectional study of adults aged 18 and above attending a blood pressure screening program in community in conjunction with May Measurement Month 2017 in Malaysia. A structured self-administered questionnaire was given to the participants who gave verbal consent. Data analysis was done using SPSS v. 23 and multiple logistic regression was used to identify the determinants of knowledge on actions to be taken during stroke and recognition of stroke symptoms.

    RESULTS: Out of 4096 respondents, 82.9-92.1% of them able to recognise the common stroke symptoms. and 74.2% of the study respondents will go to hospital within 4.5 h of stroke onset. According to binomial logistic regression analyses, adults aged 45 years old and above (OR 1.39 95%CI 1.01-1.92), being Malay (OR 1.74, 95% CI 1.27-2.40), being non-smokers (OR = 2.491, 95% CI: 1.64-3.78), hypertensives (OR: 1.57, 95% CI: 1.02-2.42)and diabetics (OR: 2.54, 95% CI:1.38-4.69) are determinants of right actions to be taken during stroke. Meanwhile, respondents aged 45 years old and older (OR = 1.68, 95% CI: 1.39-2.03), being Malay (OR = 1.49, 95% CI: 1.24-1.79), hypertensive (OR = 1.32, 95% CI: 1.04-1.66) and those who had a previous history of stroke (OR = 2.25, 95% CI: 1.01-5.00) are determinants of good recognition of stroke symptoms.

    CONCLUSIONS: The overall knowledge of stroke in our study population was good. Older age, being Malay, non-smokers, hypertensives and diabetics are determinants of right actions to be taken during stroke. Meanwhile, older age, being Malay, hypertensive and those who had a previous history of stroke are determinants of good recognition of stroke symptoms.

    MeSH terms: Adolescent; Adult; Aged; Blood Pressure; Blood Pressure Determination; Cross-Sectional Studies; Female; Humans; Hypertension/complications; Hypertension/psychology*; Health Knowledge, Attitudes, Practice*; Malaysia; Male; Mass Screening/psychology*; Middle Aged; Surveys and Questionnaires; Logistic Models; Stroke/diagnosis; Stroke/etiology; Stroke/psychology*; Young Adult; Symptom Assessment/psychology*
  2. Nik Abd Rahman NMA, Nurliyana MY, Afiqah MNFNN, Osman MA, Hamid M, Lila MAM
    BMC Complement Altern Med, 2019 Nov 29;19(1):340.
    PMID: 31783838 DOI: 10.1186/s12906-019-2757-4
    BACKGROUND: Clinacanthus nutans Lindau (C. nutans) is a species of in Acanthaceae family and primarily used in South East Asian countries. C. nutans is well known as Sabah snake grass in Malaysia, and its leaves have diverse medicinal potential in conventional applications, including cancer treatments. On the basis of literature search, there is less conclusive evidence of the involvement of phytochemical constituents in breast cancer, in particular, animal tumor models. The current study aimed to determine the antitumor and antioxidant activities of C. nutans extract in 4 T1 tumor-bearing mice.

    METHODS: C. nutans leaves were subjected to methanol extraction and divided into two different concentrations, 200 mg/kg (low-dose) and 1000 mg/kg (high-dose). The antitumor effects of C. nutans extracts were assessed using bone marrow smearing, clonogenic, and splenocyte immunotype analyses. In addition, hematoxylin and eosin, tumor weight and tumor volume profiles also used to indicate apoptosis appearance. Serum cytokine levels were examined using ELISA assay. In addition, nitric oxide assay reflecting antioxidant activity was performed.

    RESULTS: From the results obtained, the methanol extract of C. nutans leaves at 200 mg/kg (P 

    MeSH terms: Animals; Antineoplastic Agents/pharmacology*; Antioxidants/pharmacology*; Female; Inflammation; Mammary Neoplasms, Experimental/metabolism; Mammary Neoplasms, Experimental/pathology; Mice, Inbred BALB C; Plant Extracts/pharmacology*; Acanthaceae*; Cell Line, Tumor; Mice
  3. Ng HF, Ngeow YF, Yap SF, Zin T, Tan JL
    Int J Med Microbiol, 2019 Nov 18.
    PMID: 31784213 DOI: 10.1016/j.ijmm.2019.151380
    Previously, we characterized 7C, a laboratory-derived tigecycline-resistant mutant of Mycobacterium abscessus ATCC 19977, and found that the resistance was conferred by a mutation in MAB_3542c, which encodes an RshA-like protein. In M. tuberculosis, RshA is an anti-sigma factor that negatively regulates the SigH-dependent heat/oxidative stress response. We hypothesized that this mutation in 7C might dysregulate the stress response which has been generally linked to antibiotic resistance. In this study, we tested this hypothesis by subjecting 7C to transcriptomic dissection using RNA sequencing. We found an over-expression of genes encoding the SigH ortholog, chaperones and oxidoreductases. In line with these findings, 7C demonstrated better survival against heat shock when compared to the wild-type ATCC 19977. Another interesting observation from the RNA-Seq analysis was the down-regulation of ribosomal protein-encoding genes. This highlights the possibility of ribosomal conformation changes which could negatively affect the binding of tigecycline to its target, leading to phenotypic resistance. We also demonstrated that transient resistance to tigecycline could be induced in the ATCC 19977 by elevated temperature. Taken together, these findings suggest that dysregulated stress response may be associated with tigecycline resistance in M. abscessus.
    MeSH terms: Base Sequence; Drug Resistance, Microbial; Mutation; Mycobacterium tuberculosis; Oxidoreductases; Ribosomal Proteins; Ribosomes; Sigma Factor; Temperature; Down-Regulation; Sequence Analysis, RNA; Heat-Shock Response; Transcriptome
  4. Ramdzan AR, Ismail A, Mohd Zanib ZS
    Int J Infect Dis, 2019 Nov 27;91:68-72.
    PMID: 31785400 DOI: 10.1016/j.ijid.2019.11.026
    OBJECTIVES: The aim of this study was to determine the prevalence of malaria in Sabah and its potential risk factors.

    METHODS: This cross-sectional study analysed secondary data obtained from the health clinics in Sabah, Malaysia from January to August 2016. The Pearson Chi-square test was used to analyse the relationships between malaria infection and socio-demographic characteristics. Multivariable logistic regression was performed in order to determine the risk factors for malaria in Sabah.

    RESULTS: Out of 1222 patients, 410 (33.6%) had a laboratory-confirmed malaria infection. Infection by Plasmodium knowlesi accounted for the majority of malaria reports in Sabah (n=340, 82.9%). Multivariable analysis indicated that males (prevalence odds ratio 0.023, 95% confidence interval 0.012-0.047) and those living in a rural area (prevalence odds ratio 0.004, 95% confidence interval 0.002-0.009) were at higher risk 24.0-95.9) and those living in a rural area (adjusted odds ratio 212.6, 95% confidence interval 105.8-427.2) were at higher risk of acquiring a malaria infection.

    CONCLUSIONS: Malaria infections in Sabah, Malaysia are common, with P. knowlesi being the most common malaria parasite. The infection was associated with several socio-demographic and geographical factors. Thus, mitigation measures should be considered to address modifiable risk factors for malaria infection.

    MeSH terms: Animals; Cross-Sectional Studies; Geography; Humans; Malaria; Malaysia; Male; Parasites; Risk Factors; Leukemia, Myeloid, Acute; Prevalence; Confidence Intervals; Chi-Square Distribution; Logistic Models; Odds Ratio; Plasmodium knowlesi
  5. Venkataramani P, Sadanandan T, Savanna RS, Sugathan S
    Med Educ, 2019 05;53(5):499-500.
    PMID: 30891812 DOI: 10.1111/medu.13860
    MeSH terms: Educational Measurement/methods*; Female; Humans; Learning*; Malaysia; Male; Pediatrics*; Prospective Studies; Surveys and Questionnaires; Students, Medical*; Computers, Handheld
  6. Agha R, Abdall-Razak A, Crossley E, Dowlut N, Iosifidis C, Mathew G, et al.
    Int J Surg, 2019 Nov 06;72:156-165.
    PMID: 31704426 DOI: 10.1016/j.ijsu.2019.11.002
    INTRODUCTION: The STROCSS guideline was developed in 2017 to improve the reporting quality of observational studies in surgery. Building on its impact and usefulness, we sought to update the guidelines two years after its publication.

    METHODS: A steering group was formed to review the existing guideline and propose amendments to the 17-item checklist. A Delphi consensus exercise was utilised to determine agreement across a list of proposed modifications to the STROCSS 2017 guideline. An expert panel of 46 surgeons were invited to assess the proposed updates via Google Forms.

    RESULTS: The response rate was 91% (n = 42/46). High agreement was reached across all the items and the guideline was finalised in the first round. The checklist maintained 17-items, with modifications primarily considered to improve content and readability.

    CONCLUSIONS: The STROCSS 2019 guideline is hereby presented as a considered update to improve reporting of cohort, cross-sectional and case-control studies in surgery.

    MeSH terms: Cross-Sectional Studies; Publications; Cohort Studies; Case-Control Studies; Comprehension; Consensus; Checklist; Surgeons
  7. Lokman NF, Azeman NH, Suja F, Arsad N, Bakar AAA
    Sensors (Basel), 2019 Nov 25;19(23).
    PMID: 31775327 DOI: 10.3390/s19235159
    The detection of Pb(II) ions in a river using the surface plasmon resonance (SPR)-based silver (Ag) thin film technique was successfully developed. Chitosan-graphene oxide (CS-GO) was coated on top of the Ag thin film surface and acted as the active sensing layer for Pb(II) ion detection. CS-GO was synthesized and characterized, and the physicochemical properties of this material were studied prior to integration with the SPR. In X-ray photoelectron spectroscopy (XPS), the appearance of the C=O, C-O, and O-H functional groups at 531.2 eV and 532.5 eV, respectively, confirms the success of CS-GO nanocomposite synthesis. A higher surface roughness of 31.04 nm was observed under atomic force microscopy (AFM) analysis for Ag/CS-GO thin film. The enhancement in thin film roughness indicates that more adsorption sites are available for Pb(II) ion binding. The SPR performance shows a good sensor sensitivity for Ag/CS-GO with 1.38° ppm-1 ranging from 0.01 to 5.00 ppm of standard Pb(II) solutions. At lower concentrations, a better detection accuracy was shown by SPR using Ag/CS-GO thin film compared to Ag/CS thin film. The SPR performance using Ag/CS-GO thin film was further evaluated with real water samples collected from rivers. The results are in agreement with those of standard Pb(II) ion solution, which were obtained at incidence angles of 80.00° and 81.11° for local and foreign rivers, respectively.
  8. Koo HC, Poh BK, Ruzita AT
    BMC Public Health, 2019 Nov 27;19(1):1574.
    PMID: 31775696 DOI: 10.1186/s12889-019-7888-5
    BACKGROUND: Studies have reported that improvement of dietary habits through increased whole grain foods consumption at an early age has the potential to lead to betterment in lifelong health and wellness. The GReat-Child Trial™ was a 12-week quasi-experimental study with 6 months follow-up investigating a multi-component whole grain intervention, which consisted of behavioral, personal and environmental factors based on Social Cognitive Theory (SCT). This study aimed to evaluate the feasibility and acceptability of the GReat-Child Trial™, as well as to determine the changes in knowledge, attitudes and practices (KAP) of whole grains consumption among overweight/obese children.

    METHODS: Two schools in Kuala Lumpur with similar socio-demographic characteristics were assigned as intervention (IG) and control (CG), respectively. Inclusion criteria were healthy Malaysian overweight/obese children aged 9 to 11 years who had no serious co-morbidity. Children who reported consuming whole grain foods in their 3-day diet-recall during recruitment were excluded. A total of 63 children (31 IG; 32 CG) completed the intervention. KAP questionnaire was self-administered at baseline [T0] and post intervention (at 3rd [T1] and 9th month [T2]). The baseline differences between the IG and CG across socio-demographics and scores of KAP toward whole grains were determined using chi-square and t-test, respectively. ANCOVA was performed to determine the effect of the GReat-Child Trial™ on KAP towards whole grains at post-intervention and follow-up. Baseline variables were considered as covariates.

    RESULTS: The IG attained significantly higher scores in knowledge (mean difference = 4.23; 95% CI: 3.82, 4.64; p 

    MeSH terms: Whole Grains; Attitude; Child; Cognition; Demography; Diet; Feeding Behavior; Follow-Up Studies; Humans; Obesity; Surveys and Questionnaires; Schools
  9. Koko I, Song AA, Masarudin MJ, Abdul Rahim R
    BMC Biotechnol, 2019 11 27;19(1):82.
    PMID: 31775775 DOI: 10.1186/s12896-019-0575-x
    BACKGROUND: Site-specific integration system allows foreign DNA to be integrated into the specific site of the host genome, enabling stable expression of heterologous protein. In this study, integrative vectors for secretion and surface display of proteins were constructed based on a lactococcal phage TP901-1 integrating system.

    RESULTS: The constructed integration system comprises of a lactococcal promoter (PnisA or P170), phage attachment site (attP) from bacteriophage TP901-1, a signal peptide (USP45 or SPK1) for translocation of the target protein, and a PrtP344 anchor domain in the case of the integrative vectors for surface display. There were eight successfully constructed integrative vectors with each having a different combination of promoter and signal peptide; pS1, pS2, pS3 and pS4 for secretion, and pSD1, pSD2, pSD3 and pSD4 for surface display of desired protein. The integration of the vectors into the host genome was assisted by a helper vector harbouring the integrase gene. A nuclease gene was used as a reporter and was successfully integrated into the L. lactis genome and Nuc was secreted or displayed as expected. The signal peptide SPK1 was observed to be superior to USP45-LEISSTCDA fusion in the secretion of Nuc. As for the surface display integrative vector, all systems developed were comparable with the exception of the combination of P170 promoter with USP45 signal peptide which gave very low signals in whole cell ELISA.

    CONCLUSION: The engineered synthetic integrative vectors have the potential to be used for secretion or surface display of heterologous protein production in lactococcal expression system for research or industrial purposes, especially in live vaccine delivery.

    MeSH terms: Attachment Sites, Microbiological; Bacteriophages/genetics; Bacteriophages/physiology*; Genetic Engineering; Genetic Vectors/genetics; Genetic Vectors/physiology; Recombination, Genetic*; Lactococcus lactis/genetics*; Lactococcus lactis/metabolism; Lactococcus lactis/virology*; Virus Integration; Genome, Bacterial; Protein Sorting Signals/genetics
  10. Bashir A, Zunita Z, Jesse FFA, Ramanoon SZ, Mohd-Azmi ML
    Microbiol Resour Announc, 2019 Nov 27;8(48).
    PMID: 31776215 DOI: 10.1128/MRA.01057-19
    We report the whole-genome sequence of Escherichia coli sequence type 127 (ST127) strain 1538RHQ, recovered from a mastitic cow in a dairy herd in Selangor, Malaysia. The objective of this study was to identify the antigenic and virulence properties that can be used as suitable targets for vaccine development against bovine mastitis.
    MeSH terms: Animals; Cattle; Escherichia coli; Female; Humans; Malaysia; Mastitis; Mastitis, Bovine; Virulence; Biomedical Research
  11. Garba J, Samsuri WA, Othman R, Hamdani MSA
    Sci Rep, 2019 11 27;9(1):17689.
    PMID: 31776374 DOI: 10.1038/s41598-019-54079-0
    Glyphosate (GLY) is a major herbicide used throughout the world, and its continuous application has become an environmental issue. Adsorption is an important mechanism for removing organic contaminant in water. The present study characterized cow dung (CD) and rice husk ash (RHA), and determined the adsorption-desorption of GLY and its metabolite, aminomethylphoshonic acid (AMPA), on to them. The results revealed that both CD and RHA were alkaline and had no or low content of arsenic, cadmium, chromium and lead. The CD had lower surface area (13.104 mg2g-1) than RHA (21.500 m2g-1). The CD contained amines, phenol, ethers and carboxylic functional groups, while in addition to carboxylic and ether, RHA contains siloxane. Both CD and RHA had high affinities for GLY and AMPA. The Freundlich sorption coefficient (Kf) on AMPA were 2.915 and 2.660 for CD and RHA, respectively, while the values on GLY were 1.168 and 1.166 (mg g-1) for CD and RHA, respectively. Desorption of GLY only occurred at lower concentrations, while no desorption of AMPA was recorded, indicating their strong adsorption on CD and RHA. Considering their availabilities and affordable prices, both CD and RHA can be recommended as economical adsorbent for the removal of GLY and AMPA.
    MeSH terms: Adsorption; Amines; Animals; Arsenic; Cadmium; Cattle; Chromium; Ether; Ethers; Glycine; Herbicides; Phenols; Oryza; Siloxanes; Water; Phenol
  12. Azman A, Vasodavan K, Joseph N, Kumar S, Hamat RA, Nordin SA, et al.
    Future Microbiol, 2019 Nov;14:1417-1428.
    PMID: 31777284 DOI: 10.2217/fmb-2019-0174
    Aims: To study physiological and proteomic analysis of Stenotrophomonas maltophilia grown under iron-limited condition. Methods: One clinical and environmental S. maltophilia isolates grown under iron-depleted conditions were studied for siderophore production, ability to kill nematodes and alteration in protein expression using isobaric tags for relative and absolute quantification (ITRAQ). Results & conclusions: Siderophore production was observed in both clinical and environmental strains under iron-depleted conditions. Caenorhabditis elegans assay showed higher killing rate under iron-depleted (96%) compared with normal condition (76%). The proteins identified revealed, 96 proteins upregulated and 26 proteins downregulated for the two isolates under iron depletion. The upregulated proteins included several iron acquisition proteins, metabolic proteins and putative virulence proteins.
  13. Kho SS, Chan SK, Phui VE, Tie ST
    Breathe (Sheff), 2019 Jun;15(2):e62-e68.
    PMID: 31777566 DOI: 10.1183/20734735.0352-2018
    Acute chest pain and breathlessness in a haemodialysis patient is a common but challenging clinical scenario, can you diagnose and manage it? http://bit.ly/2Qf1mXr.
  14. Chitturi V, Pedapati SR, Awang M
    Materials (Basel), 2019 Nov 26;12(23).
    PMID: 31779107 DOI: 10.3390/ma12233901
    Automobile, aerospace, and shipbuilding industries are looking for lightweight materials for cost effective manufacturing which demands the welding of dissimilar alloy materials. In this study, the effect of tool rotational speed, welding speed, tilt angle, and pin depth on the weld joint were investigated. Aluminum 5052 and 304 stainless-steel alloys were joined by friction stir welding in a lap configuration. The design of the experiments was based on Taguchi's orthogonal array for conducting the experiments with four factors and three levels for each factor. The microstructural analysis showed tunnel defects, micro voids, and cracks which formed with 0° and 1.5° tilt angles. The defects were eliminated when the tilt angle increased to 2.5° and a mixed stir zone was formed with intermetallic compounds. The presence of the intermetallic compounds increased with the increase in tilt angle and pin depth which further resulted in obtaining a defect-free weld. Hooks were formed on either side of the weld zone creating a mechanical link for the joint. A Vickers hardness value of HV 635.46 was achieved in the mixed stir zone with 1000 rpm, 20 mm/min, and 4.2 mm pin depth with a tilt angle of 2.5°, which increased by three times compared to the hardness of SS 304 steel. The maximum shear strength achieved with 800 rpm, 40 mm/min, and a 4.3 mm pin depth with a tilt angle of 2.5° was 3.18 kN.
    MeSH terms: Alloys; Aluminum; Automobiles; Cost-Benefit Analysis; Hardness; Industry; Stainless Steel; Steel; Triazoles; Welding; Friction; Shear Strength
  15. Murukesu RR, Singh DKA, Subramaniam P, Tan XV, Mohamd Izhar IA, Ponvel P, et al.
    PMID: 31779256 DOI: 10.3390/ijerph16234716
    AIM: There is limited information about the association between frailty, cognitive status and functional fitness in older adults living in institutions. We aimed to determine the prevalence of frailty and its association with cognitive status and functional fitness among pre-frail and frail Malaysian older adults residing in institutions on the west coast of Peninsular Malaysia.

    METHODS: This study included 302 ambulating Malaysian institutionalised older adults. Frailty was identified using Fried's frailty criteria. Cognitive status was assessed using the Mini Mental State Examination and Addenbrooke's Cognitive Examination. Functional fitness was assessed using the Senior Fitness test. The association between frailty groups, cognitive status and functional fitness was analysed using binary logistic regression.

    RESULTS: Prevalence of frailty, prefrailty and robustness in the older adults was 56.6%, 40.7% and 2.9%, respectively. Frailty was found to be associated with hypertension (OR 2.15, 95% CI: 1.11-4.16, p = 0.024), lower cognitive status (Addenbrooke's Cognitive Examination) (OR 0.98, 95% C.I: 0.96-0.99, p = 0.038), and lower dynamic balance and mobility (Timed Up and Go test) (OR 1.09, 95% CI: 1.01-1.16, p = 0.024).

    CONCLUSION: Frailty is highly prevalent among Malaysian institutionalised older adults. Hypertension, cognitive impairment and lower dynamic balance and mobility were found to be risk factors of frailty. Screening of frailty and its associated factors should be prioritized among institutionalised older adults in view of early prevention and rehabilitation.

    MeSH terms: Aged; Aged, 80 and over; Postural Balance; Female; Homes for the Aged; Humans; Hypertension/epidemiology; Malaysia/epidemiology; Male; Middle Aged; Nursing Homes; Physical Fitness; Risk Factors; Exercise; Geriatric Assessment; Prevalence; Logistic Models; Frail Elderly*; Mobility Limitation; Mild Cognitive Impairment/epidemiology*
  16. Abdullahi D, Ahmad Annuar A, Sanusi J
    Ultrastruct Pathol, 2019;43(6):273-289.
    PMID: 31779507 DOI: 10.1080/01913123.2019.1695693
    Spinal cord injury (SCI) results from penetrating or compressive traumatic injury to the spine in humans or by the surgical compression of the spinal cord in experimental animals. In this study, the neuroprotective potential of Spirulina platensis was investigated on ultrastructural and functional recovery of the spinal cord following surgical-induced injury. Twenty-four Sprague-Dawley rats were divided into three groups; sham group, control (trauma) group, and experimental (S. platensis) group (180 mg/kg) of eight rats each. For each group, the rats were then subdivided into two groups to allow measurement at two different timepoints (day 14 and 28) for the microscopic analysis. Rats in the control and experimental S. platensis groups were subjected to partial crush injury at the level of T12 with Inox number 2 modified forceps by compressing on the spinal cord for 30 s. Pairwise comparisons of ultrastructural grading mean scores difference between the control and experimental S. platensis groups reveals that there were significant differences on the axonal ultrastructure, myelin sheath and BBB Score on Day 28; these correlate with the functional locomotor recovery at this timepoint. The results suggest that supplementation with S. platensis induces functional recovery and effective preservation of the spinal cord ultrastructure after SCI. These findings will open new potential avenue for further research into the mechanism of S. platensis-mediated spinal cord repair.
    MeSH terms: Animals; Disease Models, Animal; Pyramidal Tracts/injuries; Spinal Cord Injuries/pathology*; Rats, Sprague-Dawley; Neuroprotective Agents/pharmacology*; Dietary Supplements*; Recovery of Function; Rats; Spirulina*
  17. Marmouzi I, Ezzat SM, Salama MM, Merghany RM, Attar AM, El-Desoky AM, et al.
    Biomed Res Int, 2019;2019:4568039.
    PMID: 31781615 DOI: 10.1155/2019/4568039
    Chemical structures derived from marine foods are highly diverse and pharmacologically promising. In particular, chitooligosaccharides (COS) present a safe pharmacokinetic profile and a great source of new bioactive polymers. This review describes the antioxidant, anti-inflammatory, and antidiabetic properties of COS from recent publications. Thus, COS constitute an effective agent against oxidative stress, cellular damage, and inflammatory pathogenesis. The mechanisms of action and targeted therapeutic pathways of COS are summarized and discussed. COS may act as antioxidants via their radical scavenging activity and by decreasing oxidative stress markers. The mechanism of COS antidiabetic effect is characterized by an acceleration of pancreatic islets proliferation, an increase in insulin secretion and sensitivity, a reduction of postprandial glucose, and an improvement of glucose uptake. COS upregulate the GLUT2 and inhibit digestive enzyme and glucose transporters. Furthermore, they resulted in reduction of gluconeogenesis and promotion of glucose conversion. On the other hand, the COS decrease inflammatory mediators, suppress the activation of NF-κB, increase the phosphorylation of kinase, and stimulate the proliferation of lymphocytes. Overall, this review brings evidence from experimental data about protective effect of COS.
    MeSH terms: Animals; Chitin/analogs & derivatives*; Chitin/pharmacokinetics; Chitin/therapeutic use; Gluconeogenesis/drug effects; Glucose/metabolism; Humans; Glucose Transporter Type 2/metabolism
  18. Subramaniam S, Chan CY, Soelaiman IN, Mohamed N, Muhammad N, Ahmad F, et al.
    Arch Osteoporos, 2019 11 28;14(1):117.
    PMID: 31781876 DOI: 10.1007/s11657-019-0666-2
    The concordance between osteoporosis self-assessment tool for Asians (OSTA) and dual-energy X-ray absorptiometry (DXA) was fair in the study. Modification of OSTA cutoff values improved its sensitivity to identify subjects at risk for suboptimal bone health (osteopenia/osteoporosis) and osteoporosis.

    PURPOSE: Osteoporosis self-assessment tool for Asians (OSTA) is a convenient screening algorithm used widely to identify patients at risk of osteoporosis. Currently, the number of studies validating OSTA in Malaysian population is limited. This study aimed to validate the performance of OSTA in identifying subjects with osteoporosis determined with DXA.

    METHODS: This cross-sectional study recruited 786 Malaysians in Klang Valley, Malaysia. Their bone health status was assessed by DXA and OSTA. The association and agreement between OSTA and bone mineral density assessment by DXA were determined by Pearson's correlation and Cohen's kappa, respectively. Receiver operating characteristics (ROC) curves were used to determine the sensitivity, specificity, and area under the curve (AUC) for OSTA.

    RESULTS: OSTA and DXA showed a fair association in the study (r = 0.382, κ = 0.159, p 

    MeSH terms: Adult; Aged; Aged, 80 and over; Cross-Sectional Studies; Female; Humans; Malaysia/epidemiology; Male; Mass Screening/methods; Middle Aged; Osteoporosis/diagnosis*; Osteoporosis/epidemiology; Osteoporosis/psychology; ROC Curve; Self-Assessment*; Sensitivity and Specificity; Reproducibility of Results; Absorptiometry, Photon; Bone Density; Risk Assessment/methods; Area Under Curve; Asian Continental Ancestry Group/psychology
  19. Csato V, Kadir SZSA, Khavandi K, Bennett H, Sugden S, Gurney AM, et al.
    Physiol Rep, 2019 Nov;7(22):e14260.
    PMID: 31782255 DOI: 10.14814/phy2.14260
    We investigated the biomechanical relationship between intraluminal pressure within small mesenteric resistance arteries, oxidant activation of PKG, Ca2+ sparks, and BK channel vasoregulation. Mesenteric resistance arteries from wild type (WT) and genetically modified mice with PKG resistance to oxidative activation were studied using wire and pressure myography. Ca2+ sparks and Ca2+ transients within vascular smooth muscle cells of intact arteries were characterized using high-speed confocal microscopy of intact arteries. Arteries were studied under conditions of varying intraluminal pressure and oxidation. Intraluminal pressure specifically, rather than the generic stretch of the artery, was necessary to activate the oxidative pathway. We demonstrated a graded step activation profile for the generation of Ca2+ sparks and also a functional "ceiling" for this pressure --sensitive oxidative pathway. During steady state pressure - induced constriction, any additional Ca2+ sensitive-K+ channel functional availability was independent of oxidant activated PKG. There was an increase in the amplitude, but not the Area under the Curve (AUC) of the caffeine-induced Ca2+ transient in pressurized arteries from mice with oxidant-resistant PKG compared with wild type. Overall, we surmise that intraluminal pressure within resistance arteries controls Ca2+ spark vasoregulation through a tightly controlled pathway with a graded onset switch. The pathway, underpinned by oxidant activation of PKG, cannot be further boosted by additional pressure or oxidation once active. We propose that these restrictive characteristics of pressure-induced Ca2+ spark vasoregulation confer stability for the artery in order to provide a constant flow independent of additional pressure fluctuations or exogenous oxidants.
    MeSH terms: Animals; Enzyme Activation/drug effects; Enzyme Activation/physiology; Male; Mesenteric Arteries/drug effects; Mesenteric Arteries/physiology*; Mice, Inbred C57BL; Mice, Transgenic; Muscle, Smooth, Vascular/drug effects; Muscle, Smooth, Vascular/physiology; Myography/methods; Organ Culture Techniques; Vasoconstriction/drug effects; Vasoconstriction/physiology*; Oxidants/pharmacology; Cyclic GMP-Dependent Protein Kinases/metabolism*; Oxidative Stress/drug effects; Oxidative Stress/physiology*; Calcium Signaling/drug effects; Calcium Signaling/physiology*; Mice
  20. Nicholson T, McIntosh S
    Dyslexia, 2019 Nov 29.
    PMID: 31782590 DOI: 10.1002/dys.1636
    The purpose of the present study was to survey trainee teachers to find out if there was a relationship between phonological and phonics content knowledge, perceived proficiency in this knowledge, and feelings of self-efficacy as teachers. Participants were 51 undergraduate international teacher trainees from Malaysia studying in a 4-year university program to teach English as another language. They completed a phonological and phonics knowledge survey as well as a short questionnaire relating to self-efficacy for teaching. The survey results showed, similar to previous studies of the linguistic knowledge of teachers and teacher trainees, difficulties with phonological and phonics knowledge. Students who thought they were proficient in phonological and phonics knowledge were higher in phonological knowledge but not in phonics scores than were students who thought they were less proficient. The results for teaching self-efficacy showed that students with higher phonological knowledge had higher levels of external teaching self-efficacy in that they tended to disagree that factors outside their control made it difficult for some pupils to succeed. This suggests that higher levels of phonological knowledge gives prospective teachers more self-belief in their ability to help all their pupils.
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