Displaying publications 1 - 20 of 34 in total

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  1. Fulltext Transcutaneous bilirubinometry in Malay, Chinese and Indian term neonates
    Boo NY, Abu Bakar A
    Med J Malaysia, 1984 Mar;39(1):35-7.
    PMID: 6513837
    The transcutaneous (Tc) bilirubinometer was evaluated in 105 jaundiced neonates, comprising 38 Malays, 37 Chinese and 30 Indians, who had not been treated with phototherapy or exchange transfusion. Tc bilirubin index and serum bilirubin concentration correlated at statistically significant levels in all the three racial groups. Unlike the Chinese and Malay babies, the action levels, using Tc bilirubin index, in the Indian babies are not reliable due to the wide variation of skin pigmentation. Neonatal jaundice is conventionally monitored by estimation of serum bilirubin level. This involves blood sampling. The transcutaneous (Tc) bilirubinometer, however, is non-invasive, small and portable. In this study, the use of the Tc bilirubinometer in the management of neonatal jaundice' in the three racial groups was evaluated.
  2. Fulltext Psychiatric aspects of the acquired immunodeficiency syndrome. A case report
    Maniam T, Abu Bakar AK
    Med J Malaysia, 1988 Jun;43(2):166-9.
    PMID: 3237133
  3. Fulltext Quantitating proteinuria using the urinary protein creatinine index
    Norella Kong CT, Chin JH, Izham Cheong IK, Abu Bakar A
    Med J Malaysia, 1988 Jun;43(2):134-7.
    PMID: 3237129
  4. Development of a health information service using a videotex system
    Dzulkifli AR, Aishah AL, Ch'ng HS, Rose A, Rahmat A, Isa AM, et al.
    J Audiov Media Med, 1994 Jul;17(3):117-20.
    PMID: 7636117
    A number of health databases is now available in Malaysia, but few are accessible to the general public. However, recently a service was launched nationwide via a videotex system to also target the Malaysia public. This service is provided by the School of Pharmaceutical Sciences, Universiti Sains Malaysia (USM) in collaboration with several Malaysian Government ministries and agencies. Access to health information via videotex, be it medical, pharmaceutical or environmental is viewed as an effective means of on-line information dissemination. It provides not only rapid retrieval but is also economical and interactive, particularly suitable for a developing country.
  5. Fulltext Religious beliefs in relation to smoking: a cross-sectional study among muslim males in the month of Ramadan
    Abu Bakar A Majid, Lokman H Johari, Amal M Nasir, Anselm, S.T., Chan, W.H., Noraziah A Rahman, et al.
    Malaysian Journal of Public Health Medicine, 2002;2(2):32-35.
    MyJurnal
    A cross—sectional study conducted in the fasting month of Ramadan targeting muslim males assessed their religious beliefs in relation to smoking and their intentions t0 quit smoking in Ramadan. It was found that there law; is a strong association between their perceptions on the religious ruling of smoking as haram (prohibited) in relation to their smoking status. Among the non smokers and ex smokers, 87.8% and 73.6% respectively accept the ruling on smoking as prohibitea'(haram), while only 31.6% of smokers accept smoking as prohibited. Among the smokers, 97.7% smoke a lesser number of cigarettes during Ramadan, while 96.7% of them felt that it is easier to quit during the fasting month. The findings suggest that the religious department needs to provide more information and education to the Muslim population as to the reasons of the ruling on smoking as haram(prohibited) on religious grounds . It was also found that the majority felt it is easier to quit during quit smoking programmes can be emphasized and carried out on a bigger scale during fasting months in the future.
  6. Synthesis and characterization of poly(p-phenylene vinylene)
    Abd Rashid MY, Abu Bakar A, Mohd Asri MT, Iskandar SM
    Med J Malaysia, 2004 May;59 Suppl B:135-6.
    PMID: 15468855
    Poly (p-phenylene vinylene) (PPV) was synthesized from p-xylylene bis(tetrahydrothiophenium chloride) using the Wessling route and characterized by Fourier Transform Infra-Red (FTIR) and UV-visible (UV-VIS) spectroscopic techniques. The significance of thermal treatment along with evolution of precursor polymer to polymer PPV was also studied through these spectroscopic techniques. Thermally Stimulated Current (TSC) measurements indicated the presence of crystallization, sulphonium group which occurred through the evolution from precursor polymer to polymer PPV during thermal treatment.
  7. Raised leptin concentrations in feto-placental tissues from women with preeclampsia
    Singh HJ, Abu Bakar A, Che Romli A, Nila A
    Hypertens Pregnancy, 2005;24(2):191-9.
    PMID: 16036403
    The aim of this study was to estimate the levels of leptin in the amnion, chorion laeve, and placenta and to examine for any differences in leptin levels in these tissues from preeclamptic and normotensive pregnant women.
  8. Salmonella related mycotic aneurysm with psoas and paraortic abscess treated conservatively
    Abu Bakar A, Ngiu CS, Mohamad Said MS, Periyasamy P
    Ann Acad Med Singap, 2011 Oct;40(10):467-8.
    PMID: 22206056
  9. Fulltext Evaluation of Melaleuca cajuputi (Family: Myrtaceae) Essential Oil in Aerosol Spray Cans against Dengue Vectors in Low Cost Housing Flats
    Abu Bakar A, Sulaiman S, Omar B, Mat Ali R
    J Arthropod Borne Dis, 2012;6(1):28-35.
    PMID: 23293776
    Melaleuca cajuputi essential oil in aerosol spray was evaluated against the dengue vectors Aedes aegypti and Ae. albopictus at low cost housing flats in Section 10, Setapak, Kuala Lumpur, Malaysia.
  10. Fulltext Pituitary apoplexy: a rare cause of middle cerebral artery infarction
    Hassan R, Sharis Othman S, Ahmad Mukari SA, Abu Bakar A
    Med J Malaysia, 2013 Jun;68(3):264-6.
    PMID: 23749020 MyJurnal
    Pituitary apoplexy is a well-known complication of a pituitary adenoma. However, an ischaemic event caused by pituitary apoplexy is rare. We reported a case of pituitary apoplexy with middle cerebral artery infarction in a 44-year old man who presented with a sudden onset of altered sensorium. Vasospasm is the most likely underlying cause of the infarction in this case secondary to transdiaphragmatic rupture of the sella tumour into the subarachnoid space.
  11. Apoptosis induced by desmethyl-lasiodiplodin is associated with upregulation of apoptotic genes and downregulation of monocyte chemotactic protein-3
    Hazalin NA, Lim SM, Cole AL, Majeed AB, Ramasamy K
    Anticancer Drugs, 2013 Sep;24(8):852-61.
    PMID: 23764760 DOI: 10.1097/CAD.0b013e3283635a47
    There is growing interest in the discovery of bioactive metabolites from endophytes as an alternative source of therapeutics. Identification of their therapeutic targets is essential in understanding the underlying mechanisms and enhancing the resultant therapeutic effects. As such, bioactive compounds produced by endophytic fungi from plants at the National Park, Pahang, Malaysia, were investigated. Five known compounds were identified using LC-UV-MS-NMR and they include trichodermol, 7-epi-brefeldin A, (3R,4S)-4-hydroxymellein, desmethyl-lasiodiplodin and cytochalasin D. The present study went on to investigate the potential anticancer effects of these compounds and the corresponding molecular mechanisms of the lead compound against human breast adenocarcinoma, MCF-7. For the preliminary screening, the cytotoxicity and apoptotic effects of these compounds against MCF-7 were examined. The compounds were also tested against noncarcinogenic hepatocytes (WRL68). The differential cytotoxicity was then determined using the MTT assay. Desmethyl-lasiodiplodin was found to suppress the growth of MCF-7, yielding an inhibitory concentration (IC50) that was seven-fold lower than that of the normal cells. The cytotoxic effect of desmethyl-lasiodiplodin was accompanied by apoptosis. Subsequent analysis demonstrated increased expression levels of caspase 3, c-myc and p53. Further, desmethyl-lasiodiplodin resulted in inhibition of monocyte chemotactic protein (MCP)-3, a cytokine involved in cell survival and metastasis. Hence, this study proposed that desmethyl-lasiodiplodin inhibited growth and survival of MCF-7 through the induction of apoptosis. This anticancer effect is mediated, in part, by upregulation of apoptotic genes and downregulation of MCP-3. As desmethyl-lasiodiplodin elicited minimal impact against normal hepatocytes, our findings also imply its potential use as a specific apoptotic agent in breast cancer treatment.
  12. Fulltext Malaysia Health System Review
    Jaafar S, Mohd Noh K, Abdul Muttalib K, Othman NH, Healy J, Maskon K, et al.
    ISBN: 978-92-9061-584-2
    Citation: Jaafar S, Mohd Noh K, Abdul Muttalib K, Othman NH, Healy J, Maskon K, et al. Malaysia Health System Review. Geneva: World Health Organization; 2013

    Malaysia is a federation of 13 states and 2 territories in a parliamentary democracy, with the Prime Minister the head of government and a constitutional monarch elected by the Sultans. Malaysia is a multicultural society and a secular state with Sunni Islam as the official religion. Classified by the World Bank as an upper middle-income country, its society and economy were transformed by rapid economic growth in the latter half of the 20th century. Malaysia’s population (now numbering over 28 million with 70% living in urban areas) has benefited from a well developed health care system, good access to clean water and sanitation, and strong social and economic programmes. Life expectancy at birth is 73 years. Noncommunicable diseases now account for most mortality and morbidity but communicable diseases remain a concern. Section 2 describes the organization and governance of the health system. Health care services consist of tax-funded and governmentrun primary health care centres and hospitals, and fast-growing private services mainly located in physician clinics and hospitals in urban areas. Public sector health services are administered by the Ministry of Health through its central, state and district offices. The Ministry of Health regulates the private sector, pharmaceutical industry and food safety and plans and regulates its own health care services. Legislation governing health care professionals requires them to register with statutory professional bodies. Section 3 reports on health care financing. Malaysia’s public health system is financed mainly through general revenue and taxation collected by the federal government, while the private sector is funded principally through out-of-pocket payments from patients and some private health insurance. Spending on health reached 4.6% of GDP in 2009 with the majority from public spending, reaching 56% of total health expenditure (THE) in 2009. The main sources of THE in 2008 were the Ministry of Health (42%), followed by household out-of-pocket expenditure at nearly 34%. The Ministry of Health funds public facilities through line item budgets and patients pay private physicians and private hospitals on a fee-for-service basis. Physical and human resources are described in Section 4. The number of public primary care facilities (currently 802 centres and over 2000 small community clinics) and dental clinics were expanded steadily in earlier decades, particularly to reach people in under-served rural areas. Secondary care is offered in smaller public hospitals and more complex tertiary care, in regional and national hospitals (including university teaching hospitals run by the Ministry of Higher Education). Growth has slowed in recent years, however, and public services in urban areas have not kept pace with rapid urbanization, while the population ratio of hospital beds has declined slightly. Private clinics and hospitals in urban areas have grown rapidly over the last decade. The supply of health professionals remains seriously below the required number, although the government has increased the number of training places. Section 5 looks at provision of services. National health policies stress public health and health promotion, that is, ‘a wellness’ as well as a ‘disease’ perspective. The Ministry of Health has developed an extensive network of public primary care centres and also dental services especially for children, but these services are under strain and have staff shortages, so patients often encounter long waits. Primary care exerts only a limited gatekeeper function since people can bypass a referral from a general practitioner and for a small additional fee (if in the public sector) can go directly to specialists and hospitals. Government services increasingly serve the poor and private services the better-off people who live in urban areas. Hospital policy currently has three main thrusts: strengthening specialty care in large public hospitals; increasing the number of day surgery centres; and expanding top-end private hospital care to cater to the medical tourism market (with 35 participating hospitals in 2010). Malaysia has a large pharmaceutical manufacturing sector that exports to other countries and also supplies 30% of domestic demand. The principal health care reforms are discussed in Section 6. The government has stepped up its surveillance and early response to infectious disease outbreaks as a result of recent pandemics such as SARS and avian flu, which had a major impact on the country’s economy. The Ministry of Health has maintained its extensive vaccination programmes, has consolidated its primary health care clinics and upgraded its hospitals, and is slowly introducing information communication technology into its public facilities. The government has increased training places to counter shortages of health professionals, has strengthened food and drug safety regulation, is considering price xv regulation of pharmaceuticals, and is positioning the country as a medical tourism destination. Section 7 provides an assessment of the health system. Malaysia has a strong population health tradition and well-established and extensive health care services. Although total health expenditure at 4.6% of GDP in 2008 is in the range for middle-income countries, the government is concerned about future sustainable financing. Successive administrators have prioritized the provision of cost-effective, preventative and mainly free primary health care in public clinics. The rapid growth of private health care means that private spending has risen faster than public spending, including out-of-pocket payments by the public, with the government share (from general revenue) just above half (56%) of health expenditure in 2009. In conclusion, Malaysia has achieved impressive health gains for its population with a low-cost health care system funded through general revenue that provides universal and comprehensive services. Like many other countries in the region, Malaysia has struggled to produce an adequate supply of health professionals, and to integrate and regulate its rapidly growing private health sector. Public services have not kept pace with population growth in urban areas and those with higher purchasing power use private rather than public doctors and hospitals, which leaves the public sector with more poorer and sicker patients. The Malaysian Government recently revived the debate over options for a national social health insurance scheme. The financing challenge is to agree on a scheme for fair and sustainable funding and its respective contributions from general revenue and private payments. The regulatory challenge for the Malaysian Government is to strengthen its governance of both public and private health services in order to ensure high quality and safe services and fair charges. The structural challenge is to determine the balance between public and private sector delivery and to engage in a more productive partnership between public and private sectors. The administrative challenge is to consider whether the community would be better served by more decentralized and responsive services. As Malaysia seeks to attain high income country status, and as demographic and epidemiological transitions continue and new technology expands the possibilities for intervention, the demand for xvi health care by the population will continue to rise. The government will need to address growing concerns about equity, efficiency and budgetary constraints and balance conflicting policy principles. Pressures are building up for health system reform in Malaysia looking towards the year 2020 and beyond.
  13. Fulltext Outbreak detection model based on danger theory
    Mohamad Mohsin MF, Abu Bakar A, Hamdan AR
    Appl Soft Comput, 2014 Nov;24:612-622.
    PMID: 32362801 DOI: 10.1016/j.asoc.2014.08.030
    In outbreak detection, one of the key issues is the need to deal with the weakness of early outbreak signals because this causes the detection model to have has less capability in terms of robustness when unseen outbreak patterns vary from those in the trained model. As a result, an imbalance between high detection rate and low false alarm rate occurs. To solve this problem, this study proposes a novel outbreak detection model based on danger theory; a bio-inspired method that replicates how the human body fights pathogens. We propose a signal formalization approach based on cumulative sum and a cumulative mature antigen contact value to suit the outbreak characteristic and danger theory. Two outbreak diseases, dengue and SARS, are subjected to a danger theory algorithm; namely the dendritic cell algorithm. To evaluate the model, four measurement metrics are applied: detection rate, specificity, false alarm rate, and accuracy. From the experiment, the proposed model outperforms the other detection approaches and shows a significant improvement for both diseases outbreak detection. The findings reveal that the robustness of the proposed immune model increases when dealing with inconsistent outbreak signals. The model is able to detect new unknown outbreak patterns and can discriminate between outbreak and non-outbreak cases with a consistent high detection rate, high sensitivity, and lower false alarm rate even without a training phase.
  14. Mitochondrial targeting of bilirubin regulatory enzymes: An adaptive response to oxidative stress
    Muhsain SN, Lang MA, Abu-Bakar A
    Toxicol Appl Pharmacol, 2015 Jan 1;282(1):77-89.
    PMID: 25478736 DOI: 10.1016/j.taap.2014.11.010
    The intracellular level of bilirubin (BR), an endogenous antioxidant that is cytotoxic at high concentrations, is tightly controlled within the optimal therapeutic range. We have recently described a concerted intracellular BR regulation by two microsomal enzymes: heme oxygenase 1 (HMOX1), essential for BR production and cytochrome P450 2A5 (CYP2A5), a BR oxidase. Herein, we describe targeting of these enzymes to hepatic mitochondria during oxidative stress. The kinetics of microsomal and mitochondrial BR oxidation were compared. Treatment of DBA/2J mice with 200mgpyrazole/kg/day for 3days increased hepatic intracellular protein carbonyl content and induced nucleo-translocation of Nrf2. HMOX1 and CYP2A5 proteins and activities were elevated in microsomes and mitoplasts but not the UGT1A1, a catalyst of BR glucuronidation. A CYP2A5 antibody inhibited 75% of microsomal BR oxidation. The inhibition was absent in control mitoplasts but elevated to 50% after treatment. An adrenodoxin reductase antibody did not inhibit microsomal BR oxidation but inhibited 50% of mitochondrial BR oxidation. Ascorbic acid inhibited 5% and 22% of the reaction in control and treated microsomes, respectively. In control mitoplasts the inhibition was 100%, which was reduced to 50% after treatment. Bilirubin affinity to mitochondrial and microsomal CYP2A5 enzyme is equally high. Lastly, the treatment neither released cytochrome c into cytoplasm nor dissipated membrane potential, indicating the absence of mitochondrial membrane damage. Collectively, the observations suggest that BR regulatory enzymes are recruited to mitochondria during oxidative stress and BR oxidation by mitochondrial CYP2A5 is supported by mitochondrial mono-oxygenase system. The induced recruitment potentially confers membrane protection.
  15. Zinc: indications in brain disorders
    Prakash A, Bharti K, Majeed AB
    Fundam Clin Pharmacol, 2015 Apr;29(2):131-49.
    PMID: 25659970 DOI: 10.1111/fcp.12110
    Zinc is the authoritative metal which is present in our body, and reactive zinc metal is crucial for neuronal signaling and is largely distributed within presynaptic vesicles. Zinc also plays an important role in synaptic function. At cellular level, zinc is a modulator of synaptic activity and neuronal plasticity in both development and adulthood. Different importers and transporters are involved in zinc homeostasis. ZnT-3 is a main transporter involved in zinc homeostasis in the brain. It has been found that alterations in brain zinc status have been implicated in a wide range of neurological disorders including impaired brain development and many neurodegenerative disorders such as Alzheimer's disease, and mood disorders including depression, Parkinson's disease, Huntington's disease, amyotrophic lateral sclerosis, and prion disease. Furthermore, zinc has also been implicated in neuronal damage associated with traumatic brain injury, stroke, and seizure. Understanding the mechanisms that control brain zinc homeostasis is thus critical to the development of preventive and treatment strategies for these and other neurological disorders.
  16. Job satisfaction and perceived future roles of Malaysian dental therapists: findings from a national survey
    Abu Bakar A, Mohd Nor NA, Ab-Murat N, Jaafar N
    Int J Dent Hyg, 2015 Aug;13(3):199-205.
    PMID: 25040653 DOI: 10.1111/idh.12095
    OBJECTIVE: To assess Malaysian dental therapists' perceptions of their job satisfaction and future roles.
    METHODS: A nationwide postal survey involving all Malaysian dental therapists who met the inclusion criteria (n = 1726).
    RESULTS: The response rate was 76.8%. All respondents were females; mean age 35.4 years (SD = 8.4). Majority were married (85.5%) and more than one-half had a working experience of <10 years (56.1%). Majority worked in community dental service (94.3%) and in urban areas (61.7%). Overall, they were highly satisfied with most aspects of their career. However, they were least satisfied with administrative workload (58.1%), career advancement opportunities (51.9%) and remuneration package; specifically income (45.2%), allowances (45.2%) and non-commensurate between pay and performance (44.0%). Majority perceived their role as very important in routine clinical tasks such as examination and diagnosis, preventive treatment, extraction of deciduous teeth and oral health promotion. However, fewer than one-half consider complex treatment such as placement of preformed crowns on deciduous teeth (37.1%) and extraction of permanent teeth (37.2%) as very important tasks.
    CONCLUSION: Majority expressed high career satisfaction with most aspects of their employment but expressed low satisfaction in remuneration, lack of career advancement opportunities and administrative tasks. We conclude that most Malaysian dental therapists have positive perceptions of their current roles but do not favour wider expansion of their roles. These findings imply that there was a need to develop a more attractive career pathway for therapists to ensure sustainability of effective primary oral healthcare delivery system for Malaysia's children.
  17. Fulltext The NeuroAiD Safe Treatment (NeST) Registry: a protocol
    Venketasubramanian N, Kumar R, Soertidewi L, Abu Bakar A, Laik C, Gan R
    BMJ Open, 2015 Nov 13;5(11):e009866.
    PMID: 26567259 DOI: 10.1136/bmjopen-2015-009866
    INTRODUCTION: NeuroAiD (MLC601, MLC901), a combination of natural products, has been shown to be safe and to aid neurological recovery after brain injuries. The NeuroAiD Safe Treatment (NeST) Registry aims to assess its use and safety in the real-world setting.

    METHODS AND ANALYSIS: The NeST Registry is designed as a product registry that would provide information on the use and safety of NeuroAiD in clinical practice. An online NeST Registry was set up to allow easy entry and retrieval of essential information including demographics, medical conditions, clinical assessments of neurological, functional and cognitive state, compliance, concomitant medications, and side effects, if any, among patients on NeuroAiD. Patients who are taking or have been prescribed NeuroAiD may be included. Participation is voluntary. Data collected are similar to information obtained during standard care and are prospectively entered by the participating physicians at baseline (before initialisation of NeuroAiD) and during subsequent visits. The primary outcome assessed is safety (ie, non-serious and serious adverse event), while compliance and neurological status over time are secondary outcomes. The in-person follow-up assessments are timed with clinical appointments. Anonymised data will be extracted and collectively analysed. Initial target sample size for the registry is 2000. Analysis will be performed after every 500 participants entered with completed follow-up information.

    ETHICS AND DISSEMINATION: Doctors who prescribe NeuroAiD will be introduced to the registry by local partners. The central coordinator of the registry will discuss the protocol and requirements for implementation with doctors who show interest. Currently, the registry has been approved by the Ethics Committees of Universiti Kebangsaan Malaysia (Malaysia) and National Brain Center (Indonesia). In addition, for other countries, Ethics Committee approval will be obtained in accordance with local requirements.

    TRIAL REGISTRATION NUMBER: NCT02536079.

  18. Occurrence, distribution, and dechlorination of polychlorinated biphenyls and health risk assessment in Selangor River basin
    Sakai N, Dayana E, Abu Bakar A, Yoneda M, Nik Sulaiman NM, Ali Mohd M
    Environ Monit Assess, 2016 Oct;188(10):592.
    PMID: 27679511
    Polychlorinated biphenyls (PCBs) were monitored in surface water collected in the Selangor River basin, Malaysia, to identify the occurrence, distribution, and dechlorination process as well as to assess the potential adverse effects to the Malaysian population. Ten PCB homologs (i.e., mono-CBs to deca-CBs) were quantitated by using gas chromatography-mass spectrometry (GC/MS). The total concentration of PCBs in the 10 sampling sites ranged from limit of detection to 7.67 ng L(-1). The higher chlorinated biphenyls (tetra-CBs to deca-CBs) were almost not detected in most of the sampling sites, whereas lower chlorinated biphenyls (mono-CBs, di-CBs, and tri-CBs) dominated more than 90 % of the 10 homologs in all the sampling sites. Therefore, the PCB load was estimated to be negligible during the sampling period because PCBs have an extremely long half-life. The PCBs, particularly higher chlorinated biphenyls, could be thoroughly dechlorinated to mono-CBs to tri-CBs by microbial decomposition in sediment or could still be accumulated in the sediment. The lower chlorinated biphenyls, however, could be resuspended or desorbed from the sediment because they have faster desorption rates and higher solubility, compared to the higher chlorinated biphenyls. The health risk for the Malaysia population by PCB intake that was estimated from the local fish consumption (7.2 ng kg(-1) bw day(-1)) and tap water consumption (1.5 × 10(-3)-3.1 × 10(-3) ng kg(-1) bw day(-1)) based on the detected PCB levels in the surface water was considered to be minimal. The hazard quotient based on the tolerable daily intake (20 ng kg(-1) bw day(-1)) was estimated at 0.36.
  19. Hybrid soliwave technique for mitigating sulfate-reducing bacteria in controlling biocorrosion: a case study on crude oil sample
    Mohd Ali MKFB, Abu Bakar A, Md Noor N, Yahaya N, Ismail M, Rashid AS
    Environ Technol, 2017 Oct;38(19):2427-2439.
    PMID: 27875932 DOI: 10.1080/09593330.2016.1264486
    Microbiologically influenced corrosion (MIC) is among the common corrosion types for buried and deep-water pipelines that result in costly repair and pipeline failure. Sulfate-reducing bacteria (SRB) are commonly known as the culprit of MIC. The aim of this work is to investigate the performance of combination of ultrasound (US) irradiation and ultraviolet (UV) radiation (known as Hybrid soliwave technique, HyST) at pilot scale to inactivate SRB. The influence of different reaction times with respect to US irradiation and UV radiation and synergistic effect toward SRB consortium was tested and discussed. In this research, the effect of HyST treatment toward SRB extermination and corrosion studies of carbon steel coupon upon SRB activity before and after the treatment were performed using weight loss method. The carbon steel coupons immersed in SRB sample were exposed to HyST treatment at different time of exposure. Additionally, Field Emission Scanning Electron Microscopy coupled with Energy Dispersive X-ray Spectroscopy were used to investigate the corrosion morphology in verifying the end product of SRB activity and corrosion formation after treatment. Results have shown that the US irradiation treatment gives a synergistic effect when combined with UV radiation in mitigating the SRB consortium.
  20. Fulltext Mitochondrial DNA Mutations in Grade II and III Glioma Cell Lines Are Associated with Significant Mitochondrial Dysfunction and Higher Oxidative Stress
    Soon BH, Abdul Murad NA, Then SM, Abu Bakar A, Fadzil F, Thanabalan J, et al.
    Front Physiol, 2017;8:231.
    PMID: 28484394 DOI: 10.3389/fphys.2017.00231
    The role of mitochondria in tumorigenesis has regained much attention as it could dysregulate cellular energetics, oxidative stress and apoptosis. However, the role of mitochondria in different grade gliomasis still unknown. This study aimed to identify mitochondrial DNA (mtDNA) sequence variations that could possibly affect the mitochondrial functions and also the oxidative stress status. Three different grades of human glioma cell lines and a normal human astrocyte cell line were cultured in-vitro and tested for oxidative stress biomarkers. Relative oxidative stress level, mitochondria activity, and mitochondrial mass were determined by live cell imaging with confocal laser scanning microscope using CM-H2DCFDA, MitoTracker Green, and MitoTracker Orange stains. The entire mitochondrial genome was sequenced using the AffymetrixGeneChip Human Mitochondrial Resequencing Array 2.0. The mitochondrial sequence variations were subjected to phylogenetic haplogroup assessment and pathogenicity of the mutations were predicted using pMUT and PolyPhen2. The Grade II astrocytoma cells showed increased oxidative stress wherea high level of 8-OHdG and oxidative stress indicator were observed. Simultaneously, Grade II and III glioma cells showed relatively poor mitochondria functions and increased number of mutations in the coding region of the mtDNA which could be due to high levels of oxidative stress in these cells. These non-synonymous mtDNA sequence variations were predicted to be pathogenic and could possibly lead to protein dysfunction, leading to oxidative phosphorylation (OXPHOS) impairment, mitochondria dysfunction and could create a vicious cycle of oxidative stress. The Grade IV cells had no missense mutation but preserved intact mitochondria and excellent antioxidant defense mechanisms thus ensuring better survival. In conclusion, Grade II and III glioma cells demonstrated coding region mtDNA mutations, leading to mitochondrial dysfunction and higher oxidative stress.
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