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Fulltext Test for the presence of autocorrelation in the modified Gompertz model used in fitting of Burkholderia sp. strain Neni-11 growth on acrylamide

Mohd. Yunus Shukor

Bioremediation Science and Technology Research, 2016;4(2):25-27.
MyJurnal

The growth of microorganism on substrates, whether toxic or not usually exhibits sigmoidal
pattern. This sigmoidal growth pattern can be modelled using primary models such as Logistic,
modified Gompertz, Richards, Schnute, Baranyi-Roberts, Von Bertalanffy, Buchanan threephase
and Huang. Previously, the modified Gompertz model was chosen to model the growth of
Burkholderia sp. strain Neni-11 on acrylamide, which shows a sigmoidal curve. The modified
Gompertz model relies on the ordinary least squares method, which in turn relies heavily on
several important assumptions, which include that the data does not show autocorrelation. In this
work we perform statistical diagnosis test to test for the presence of autocorrelation using the
Durbin-Watson test and found that the model was adequate and robust as no autocorrelation of
the data was found.
Fulltext Bartlett and the Levene's tests of homoscedasticity of the modified Gompertz model used in fitting of Burkholderia sp. strain Neni-11 growth on acrylamide

Mohd. Yunus Shukor

Bioremediation Science and Technology Research, 2016;4(1):18-19.
MyJurnal

Most often than not, microorganism’s growth curve is sigmoidal in characteristics.
The modified Gompertz model via nonlinear regression using the least square method
is one of the most popular methods to describe the growth curve. One of the
assumptions of a good model is that the variance of the data must be homogenous
(homoscedasticity). In this work, two statistical diagnostics; the Bartlett and the
Levene’s tests was performed to a modified Gompertz model utilized to model the
growth of the bacterium Burkholderia sp. strain Neni-11 on acrylamide in order to
satisfy the requirement above and found that data conformed to the requirement
indicating the modified Gompertz model is a robust model for modelling the bacterial
growth process.
Fulltext Phenol removal via cellular immobilization: a review

Aisami Abubakar, Mohd Yunus Shukor

Bioremediation Science and Technology Research, 2017;5(2):1-7.
MyJurnal

Environmental pollution is one of the major concerns in the 21st century; where billions of tonnes
of harmful chemicals are produced by industries such as petroleum, paints, food, rubber, and
plastic. Phenol and its derivatives infiltrate the ecosystems and have become one of the top major
pollutants worldwide. This review covers the major aspects of immobilization of phenoldegrading
bacteria as a method to improve phenol bioremediation. The use of various forms of
immobilization matrices is discussed along with the advantages and disadvantages of each of the
immobilization matrices especially when environmental usage is warranted. To be used as a
bioremediation tool, the immobilized system must not only be effective, but the matrices must be
non-toxic, non-polluting and if possible non-biodegradable. The mechanical, biological and
chemical stability of the system is paramount for long-term activity as well as price is an
important factor when the very large scale is a concern. The system must also be able to tolerate
high concentration of other toxicants especially heavy metals that form as co-contaminants, and
most immobilized systems are geared towards this last aspect as immobilization provides
protection from other contaminants.
Fulltext Three squamous cell carcinomas of different sites in three years: A mere coincidence?

Azman M, Mohd Yunus MR

Indian J Cancer, 2015 Apr-Jun;52(2):201-2.
PMID: 26853404 DOI: 10.4103/0019-509X.175817
Fulltext Autogenous free fat graft combined with platelet-rich fibrin heals a refractory mandibular osteoradionecrosis

Law B, Mohd Yunus SS, Ramli R

Clin Ter, 2020 3 7;171(2):e110-e113.
PMID: 32141481 DOI: 10.7417/CT.2020.2199

Osteoradionecrosis (ORN) is a well-recognized, debilitating complication of radiotherapy for patients with head and neck cancer. There is no universally accepted treatment for ORN of the jawbones. We report on a case of refractory mandibular ORN treated by sequestrectomy of mandible and autogenous transplantation of fat graft combined with platelet-rich fibrin (PRF). Improved perfusion was observed using the laser Doppler flowmetry. This case highlights the use of autogenous free fat graft and PRF as an adjunct therapy to sequestrectomy in the management of ORN.
Fulltext Malaysian Child Restraint Issues: A Brief Narrative Review

Ramli R, Mohd Yunus SS

Int J Environ Res Public Health, 2020 03 16;17(6).
PMID: 32187977 DOI: 10.3390/ijerph17061922

The child restraint legislation in Malaysia becomes mandatory from 1 January 2020. Prior to commencement of the rule, a survey showed that only 36% of Malaysian parents were aware of the importance of a child restraint system (CRS) and only 27% usage was reported during travel. The Malaysian Institute of Road Safety report showed that children transported in private vehicles were the leading groups of casualties among children aged 1 to 4 years old (43.8%) and 5 to 9 years old (30.2%), respectively. We performed a narrative review using the PubMed, ScienceDirect and Google Scholar databases using keywords such as child restraint system, unrestrained injuries, Malaysia and epidemiology. The objectives of this review were: (1) to determine the prevalence on the use of CRS in Malaysia, (2) to evaluate the injuries related to unrestrained children and (3) to show the nation's preparation towards implementation of the child restraint law. Six papers on prevalence, one paper on injury and six mainstream newspaper were included in this study. The prevalence of a CRS use was shown between 5% to 41.8%. In relation to injury, the only publication from this country showed that among 19 children involved in a car crash, five (26.3%) children had non-craniomaxillofacial (CMF) injuries, ten (52.6%) with CMF injuries only, two (10.5%) with both CMF and non-CMF injuries and two (10.5%) without any injury. Overall, the Injury Severity Score (ISS) range was between 0 to 13 (median, 1.00; interquartile range, 1). Preparation to comply with the best practice of the child restraint law is still ongoing, especially those addressing the issues related to the low-income parents in the country. Due to scarcity of publication and data on the CRS use and injuries related to its non-usage, it is advocated that parallel with the implementation legislation, vigorous forms of public education as well as good data management must be performed and monitored regularly by the road safety authority in this country.
HMG-CoA Reductase as Target for Drug Development

Gunasekaran B, Shukor MY

Methods Mol Biol, 2020;2089:245-250.
PMID: 31773659 DOI: 10.1007/978-1-0716-0163-1_16

The main strategy for lowering blood cholesterol levels is through the inhibition of the NADPH-dependent HMG-CoA reductase (3-hydroxy-3-methyl-glutaryl-CoA reductase). The enzyme catalyses the reduction of HMG-CoA to mevalonate and this process is inhibited by statins that form the bulk of the therapeutic agents to treat high cholesterol since the 1970s. Newer drugs that are safer than statins are constantly being developed. The inhibition of candidate drugs to HMG-CoA reductase remains the mainstay of drug development research. The determination of the enzyme activity is important for the correct assessment of potency of the enzyme as well as determining the inhibition of potential therapeutic agents from the plant and microbial extracts. Also, this chapter covers the use of the popular four-parameter logistics model that can yield accurate estimation of the IC50 values of therapeutic agents and their 95% confidence intervals.
Construct and criterion validity of the Malaysia version of Lower Extremity Functional Scale (LEFS)

Mohd Yunus MA, Musa R, Nazri MY

Asia Pac J Sports Med Arthrosc Rehabil Technol, 2017 Oct;10:8-11.
PMID: 29392110 DOI: 10.1016/j.asmart.2017.09.002

Objective: The objective of this study is to translate the Lower Extremity Functional Scale (LEFS) into the Malay language and to validate the resulting version.
Methods: A two-stage observational study was conducted. The LEFS was initially cross-culturally adapted to Malay language through double forward and backward translation. The finalized version of Malay LEFS (M-LEFS) was subsequently validated for both construct validity and criterion validity. Participants (n = 208) with normal lower limb condition and various lower limb conditions completed the M-LEFS.
Results: Reliability of M-LEFS revealed excellent Cronbach's alpha value of 0.98. Construct validity, evaluated using exploratory factor analysis, exhibited good factor loadings (>0.6) of all 20 items. Interestingly, we extracted 2 components which was not reported elsewhere. With a cut-off point of 60, the sensitivity of the scale was 99% and the specificity was 81%.
Conclusions: The M-LEFS had very good psychometric properties among the studied population. Further studies are needed to enhance these preliminary outcomes in Malaysia.
Cervical Laminoforaminotomy for Treatment of Cervical Radiculopathy: A Case Report

Mohd Yunus MS, Sabri S, Mokhtar SA

Cureus, 2024 Jul;16(7):e65499.
PMID: 39188472 DOI: 10.7759/cureus.65499

Cervical laminoforaminotomy (CLF) provides a safe and effective decompression procedure of nerve roots while maintaining cervical mobility and preserving stability. However, this unique technique requires appropriate patient selection and the technical ability of the surgeon to produce an excellent outcome. Furthermore, anterior cervical discectomy and fusion (ACDF) has been accepted as the "gold standard" procedure in managing cervical radiculopathy, despite posing the risk of anterior structure injuries and fusion. Here we report a case report of the surgical management of unilateral cervical radiculopathy using the CLF technique.
Fulltext Telomerase in cancer: the role in chronic myeloid leukaemia

Watihayati Mohd Shamshudin, Nazihah Mohd Yunus, Sarina Sulong

Buletin Persatuan Genetik Malaysia, 2015;21(1):20-25.
MyJurnal

Telomerase has become important in molecular genetics since its discovery in 1984. The study of telomere in ciliate Tetrahymena thermophilia since 4 decades ago has led to the discovery of telomerase that was discovered by Elizabeth Blackburn and her postgraduate student, Carol Widney Greider in 1984. Later in 2009, Jack William Szostak together with Greider and Blackburn were awarded the Nobel Prize in Physiology or Medicine for their discovery. (Copied from article).
Enteral glutamine supplementation in surgical patients with head and neck malignancy: A randomized controlled trial

Azman M, Mohd Yunus MR, Sulaiman S, Syed Omar SN

Head Neck, 2015 Dec;37(12):1799-807.
PMID: 24992652 DOI: 10.1002/hed.23839

Glutamine supplementation is a novel approach to perioperative nutritional management.
Fulltext Innovative Self-Confidence Webinar Intervention for Depression in the Workplace: A Focus Group Study and Systematic Development

Wan Mohd Yunus WMA, Musiat P, Brown JSL

Behav Sci (Basel), 2020 Dec 16;10(12).
PMID: 33339086 DOI: 10.3390/bs10120193

Brief face-to-face self-confidence workshops were effective in reducing depression among the public. Technological advances have enabled traditional face-to-face interventions to be adapted using unique technology-mediated platforms. This article details the formative development of a self-confidence web-based seminar (webinar) intervention for workplace depression. The first section discusses a qualitative study that explores the feasibility and acceptability of adapting the self-confidence workshops into a webinar platform on employees in the workplace. The second section describes the systematic development of this new webinar intervention informed by the qualitative study findings, a published systematic review, and previous face-to-face self-confidence workshops. The qualitative study involves three focus groups (n = 10) conducted in a small organization. Three themes were identified relevant to the running of the new self-confidence webinars in the workplace: personal (content, time and duration preference, features of the webinar, individual participation, personalization), interpersonal (stigma from others, engagement with participants/presenter, moderated interaction), and organizational (endorsement from management, work demand). For the intervention development, the format, structure, features, and content of the self-confidence webinar intervention are described. Features such as file sharing, virtual whiteboard, live chat, and poll are explained with the intervention primarily based on cognitive behavior therapy and coping flexibility concepts.
Fulltext Evaluating the Feasibility of an Innovative Self-Confidence Webinar Intervention for Depression in the Workplace: A Proof-of-Concept Study

Wan Mohd Yunus WMA, Musiat P, Brown JS

JMIR Ment Health, 2019 Apr 26;6(4):e11401.
PMID: 31025943 DOI: 10.2196/11401

BACKGROUND: Depression in the workplace is a very common problem that exacerbates employees' functioning and consequently influences the productivity of organizations. Despite the commonness of the problem and the currently available interventions, a high proportion of employees do not seek help. A new intervention, a webinar (Web-based seminar), was developed, which integrated the use of technology and the traditional guided therapist support to provide accessible help for the problem of depression in the workplace.
OBJECTIVE: The aim of this study was to explore the feasibility, preliminary outcome, and acceptability of the webinar intervention conducted in organizations.
METHODS: In total, 2 organizations were invited to participate, and 33 employees participated in this proof-of-concept study. The webinar intervention consisted of 6 1-hour sessions conducted via the Adobe Connect platform, developed by Adobe Inc. The intervention was developed based on a systematic review, focus group studies, and face-to-face self-confidence workshops that utilized cognitive behavior therapy (CBT). The final webinar intervention used CBT and the coping flexibility approach. The structure of the intervention included PowerPoint presentations, animation videos, utilization of chat panels, and whiteboard features. The intervention was conducted live and guided by a consultant psychologist assisted by a moderator. Study outcomes were self-assessed using self-reported Web surveys. The acceptability of the intervention was assessed using self-reported user experience Web surveys and open-ended questions.
RESULTS: The findings showed: (1) evidence of feasibility of the intervention: the webinar intervention was successfully conducted in 3 groups, with 6 1-hour sessions for each group, with 82% (23/28) participants completing all 6 sessions; (2) positive improvements in depression: the linear mixed effects modeling analysis recorded a significant overall effect of time primarily for depression (F2, 48.813=31.524; P
Systematic review of universal and targeted workplace interventions for depression

Wan Mohd Yunus WMA, Musiat P, Brown JSL

Occup Environ Med, 2018 01;75(1):66-75.
PMID: 29074553 DOI: 10.1136/oemed-2017-104532

Depression is increasingly being recognised as a significant mental health problem in the workplace contributing to productivity loss and economic burden to organisations. This paper reviews recently published randomised controlled trials (RCTs) of universal and targeted interventions to reduce depression in the workplace. Studies were identified through searches of EMBASE, MEDLINE/PubMed, PsycINFO, PsycARTICLES Full Text, and Global Health and Social Policy and Practice databases. Studies were included if they included an RCT of a workplace intervention for employees targeting depression as the primary outcome. Twenty-two published RCTs investigating interventions utilising various therapeutic approaches were identified. The cognitive behavioural therapy (CBT) approach is the most frequently used in the workplace, while interventions that combine different therapeutic approaches showed the most promising results. A universal intervention in the workplace that combines CBT and coping flexibility recorded the highest effect size (d=1.45 at 4 months' follow-up). Most interventions were delivered in group format and showed low attrition rates compared with other delivery formats. Although all studies reviewed were RCTs, the quality of reporting is low. Interventions using different therapeutic approaches with different modes of delivery have been used. Most of these interventions were shown to reduce depression levels among employees in the workplace, particularly those that combine more than one therapeutic approaches.
Evaluating the toxicity of polyurethane during marine clay stabilisation

Saleh S, Ahmad K, Mohd Yunus NZ, Hezmi MA

Environ Sci Pollut Res Int, 2020 Jun;27(17):21252-21259.
PMID: 32266626 DOI: 10.1007/s11356-020-08549-y

In civil engineering, many geotechnical and forensic projects employ polyurethane (PU) for ground improvement, and the results have shown to be effective in terms of time and cost savings. However, similar to many other chemical stabilisers, the use of PU for soil stabilisation may have environmental repercussions. Therefore, this paper utilised a toxicity characteristic leaching procedure (TCLP) to investigate the potential for ground contamination resulting from the application of PU for the stabilisation of marine clay. Furthermore, the hazardousness of PU during the stabilisation of marine clay was investigated by testing its reactivity, ignitability, corrosivity and physical properties. The results reveal that the quantity of heavy metals present in PU is far below the regulatory limits. The results further confirm that PU is odourless and non-corrosive and that it is non-cyanide and non-sulphide-bearing. However, PU is capable of igniting. Overall, the potential application of PU for ground improvement is promising due to its environmental friendliness.
Fulltext The Effect of Hydroxytyrosol in Type II Epithelial-Mesenchymal Transition in Human Skin Wound Healing

Batarfi WA, Mohd Yunus MH, Hamid AA

Molecules, 2023 Mar 15;28(6).
PMID: 36985625 DOI: 10.3390/molecules28062652

Skin wound healing is a multiphase physiological process that involves the activation of numerous types of cells and is characterized by four phases, namely haemostasis, inflammatory, proliferative, and remodeling. However, on some occasions this healing becomes pathological, resulting in fibrosis. Epithelial mesenchymal transition (EMT) is an important process in which epithelial cells acquire mesenchymal fibroblast-like characteristics. Hydroxytyrosol (HT) is a phenolic compound extracted from olive oil and has been proven to have several health benefits. The aim of this study was to determine the effect of HT in type II EMT in human skin wound healing via cell viability, proliferation, migration, and proteins expression. Human dermal fibroblasts (HDF) isolated from skin samples were cultured in different concentrations of HT and EMT model, induced by adding 5 ng/mL of transforming growth factor-beta (TGF-β) to the cells. HT concentrations were determined via 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay. Cells' migrations were evaluated using scratch and transwell migration assay. Protein expressions were evaluated via immunocytochemistry. The result showed that HT at 0.2% and 0.4% significantly increased the proliferation rate of HDF (p < 0.05) compared to control. Scratch assay after 24 h showed increased cell migration in cells treated with 0.4% HT (p < 0.05) compared to the other groups. After 48 h, both concentrations of HT showed increased cell migration (p < 0.05) compared to the TGF-β group. Transwell migration revealed that HT enhanced the migration capacity of cells significantly (p < 0.05) as compared to TGF-β and the control group. In addition, HT supplemented cells upregulate the expression of epithelial marker E-cadherin while downregulating the expression of mesenchymal marker vimentin in comparison to TGF-β group and control group. This study showed that HT has the ability to inhibit EMT, which has potential in the inhibition of fibrosis and persistent inflammation related to skin wound healing.
Virtual screening, molecular docking, molecular dynamics, and MM-GBSA approaches identify prospective fructose-1,6-bisphosphatase inhibitors from pineapple for diabetes management

Hossain MS, Roney M, Bin Mohd Yunus MY, Shariffuddin JH

J Biomol Struct Dyn, 2023 Nov 02.
PMID: 37916669 DOI: 10.1080/07391102.2023.2276889

Diabetes affects millions globally and poses treatment challenges. Targeting the enzyme fructose-1,6-bisphosphatase (FBPase) in gluconeogenesis and exploring plant-based therapies offer potential solutions for improving diabetes management while supporting sustainability and medicinal advancements. Utilizing pineapple (Ananas comosus L. Merr.) waste as a source of drug precursors could be valuable for health and environmental care due to its medicinal benefits and abundant yearly biomass production. Therefore, this study conducted a virtual screening to identify potential natural compounds from pineapple that could inhibit FBPase activity. A total of 112 compounds were screened for drug-likeness and ADMET properties, and molecular docking simulations were performed on 20 selected compounds using blind docking. The lead compound, butane-2,3-diyl diacetate, was subjected to 100 ns MD simulations, revealing a binding energy of -5.4 kcal/mol comparable to metformin (-5.6 kcal/mol). The MD simulation also confirmed stable complexes with crucial hydrogen bonds. Glu20, Ala24, Thr27, Gly28, Glu29, Leu30, Val160, Met177, Asp178, and Cys179 were identified as key amino acids that stabilized the human liver FBPase-butane-2,3-diyl diacetate complex, while Tyr215 and Asp218 played a crucial role in the human liver FBPase-Metformin complex. Our study indicates that the lead compound has high intestinal solubility. Therefore, it would show rapid bloodstream distribution and effective action on the target protein, making butane-2,3-diyl diacetate a potential antidiabetic drug candidate. However, further investigations in vitro, preclinical, and clinical trials are required to thoroughly assess its efficacy and safety.Communicated by Ramaswamy H. Sarma.
Tuberculous cervical lymphadenitis in a patient with suspected neck recurrence

Yong DJ, Iskandar H, Razif MY

Chin Med J (Engl), 2012 May;125(9):1667-8.
PMID: 22800842

The significance of metastastic disease in the cervical lymph nodes has long been appreciated. The rich lymphatics of the upper aerodigestive tract explained the high incidence of cervical metastasis, occasional bilaterally spread. Even with appropriate treatment, cervical recurrences do occur. Nonetheless, with the resurgence of tuberculosis, the differential of tuberculous cervical lymphadenitis should be excluded. Appropriate modalities should be employed in making the appropriate diagnosis possible.
Fulltext After the hospital episode - The Community Follow-Up Project

Mohd Sidik S, Azhar MZ, Abdullah MY

Asia Pac Fam Med, 2004;3(1&2):1-8.

The Community Follow-up Project involves a scheme by which clinical students follow the progress of patients after discharge from hospital. The Community Follow-up Project begins with the student choosing a hospital in-ward patient during their first clinical ward based attachment and follows this patient's progress after discharge from the hospital. The students do a series of home visits and also accompany their patients for some of their follow-ups to the hospital or government clinics; to their general practitioners and even to the palliative care or social welfare centres. The students assess the physical, psychological and social impact of the illness on the patient, family and community. This project supplements students' knowledge of the natural history of disease and emphasizes the importance of communication and the use of community resources. By commitment to the patient for a duration of time, the students are able to take an active role in patients' care, understand in depth the problems faced by patients and in assessing a patient's progress, students find themselves in the role of a teacher and advisor to their patient as well. We outline the main components of this project, describe its outcome and consider areas that invite further developments.
Fulltext Radon concentration in workplace indoor air

Abdullah Mohd Noh, Nordin Ayoub, Siti Zurina Mat Noor, Norhafizah Zahari, Mardhiyati Mohd Yunus

Journal of Occupational Safety and Health, 2019;16(1):19-25.
MyJurnal

Radon exists naturally in the air. It can accumulate inside the buildings which may affect the indoor air quality. Radon is a radioactive gas that produces alpha particles during decay time. The alpha particles might cause harm to the human lungs and stomach. Inhalation of radon is one of the causes of lung cancer disease. Samples of inhaled radon in different rooms at the workplace were taken hourly through a passive diffusion chamber. The detection method was done using Alpha Spectrometry. The short term measurement was applied in the study to monitor the average weekly radon reading in different rooms in the Medical Imaging Laboratory of the University of Selangor (UNISEL). All tested rooms showed the existence of radon gas with different concentrations. Some of them showed the maximum reading of radon concentration which was higher than the radon action level of 148Bq/m3 or 4pCi/l. Their weekly average of radon concentration is contributing almost 50% of the accumulated radon concentration in the laboratory. It is highly recommended that monitoring the concentration of radon in indoor air is performed to ensure it is at a safe and healthy level.

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