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Aliasa NH, Othman NH, Lau WJ, Marpani F, Shayuti MS, Hir ZAM, Jaafar J, Aziz MHA. Photocatalytic Membrane for Emerging Pollutants Treatment. Advanced Technologies for Solid, Liquid, and Gas Waste Treatment 2023:95-114. [DOI: 10.1201/9781003260738-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
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2
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Shayuti MSM, Zainal S, Ya TMYST, Abdullah MZ, Shahruddin MZ, Othman NH, Alias NH, Mohd TAT, Sharudin RW. Assessment of contaminants in sand production from petroleum wells offshore Sabah. Environ Sci Pollut Res Int 2023; 30:17122-17128. [PMID: 35469382 DOI: 10.1007/s11356-022-20389-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2021] [Accepted: 04/18/2022] [Indexed: 06/14/2023]
Abstract
Sand production remains a huge obstacle in many oil and gas fields around the world, but the hazards of contaminants riding on the produced sand are often not emphasised. Improper disposal of the sand could see the toxic leaching into the environment including the food chain, endangering all living organisms. The impending sand production from an oilfield offshore Sabah also suffers from the lack of hazards identification; hence, this study was conducted to assess the contaminant on the produced sand. Sand samples were collected from multiple wells in the area, with the contaminants extracted using n-hexane and subjected to chemical and thermal analyses. FTIR and GC-MS detected traces of harmful pollutants like naphthalene, amine substances, cyclohexanol, and short-chain alkanes. It was discovered that the volatile fraction of the contaminants was able to evaporate at 33 °C, while high energy was needed to remove 100% of the contaminants from the sand. Overall, the produced sand from the oilfield was unsafe and required treatment before it could be dumped or used.
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Affiliation(s)
- Muhammad Shafiq Mat Shayuti
- Mechanical Engineering Department, Universiti Teknologi PETRONAS, 32610, Seri Iskandar, Perak, Malaysia.
- College of Engineering, School of Chemical Engineering, Universiti Teknologi MARA, 40450, Shah Alam, Selangor, Malaysia.
| | - Suzalina Zainal
- Group Research & Technology, PETRONAS, 43000, Bandar Baru Bangi, Selangor, Malaysia
| | - Tuan Mohammad Yusoff Shah Tuan Ya
- Mechanical Engineering Department, Universiti Teknologi PETRONAS, 32610, Seri Iskandar, Perak, Malaysia
- High Performance Computing Centre, Universiti Teknologi PETRONAS, 32610, Seri Iskandar, Perak, Malaysia
| | - Mohamad Zaki Abdullah
- Mechanical Engineering Department, Universiti Teknologi PETRONAS, 32610, Seri Iskandar, Perak, Malaysia
| | - Munawar Zaman Shahruddin
- College of Engineering, School of Chemical Engineering, Universiti Teknologi MARA, 40450, Shah Alam, Selangor, Malaysia
| | - Nur Hidayati Othman
- College of Engineering, School of Chemical Engineering, Universiti Teknologi MARA, 40450, Shah Alam, Selangor, Malaysia
| | - Nur Hashimah Alias
- College of Engineering, School of Chemical Engineering, Universiti Teknologi MARA, 40450, Shah Alam, Selangor, Malaysia
| | - Tengku Amran Tengku Mohd
- College of Engineering, School of Chemical Engineering, Universiti Teknologi MARA, 40450, Shah Alam, Selangor, Malaysia
| | - Rahida Wati Sharudin
- College of Engineering, School of Chemical Engineering, Universiti Teknologi MARA, 40450, Shah Alam, Selangor, Malaysia
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Jamaluddin NS, Alias NH, Jaafar J, Othman NH, Sadaki S, Marpani F, Lau WJ, Abd Aziz MH. Exploring Potential of Adsorptive-Photocatalytic Molybdenum Disulphide/Polyacrylonitrile (MoS2/PAN) Nanofiber Coated Cellulose Acetate (CA) Membranes for Treatment of Wastewater. J Polym Environ 2022; 30:5290-5300. [DOI: 10.1007/s10924-022-02619-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 09/27/2022] [Indexed: 09/02/2023]
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Said N, Wong KC, Lau WJ, Khoo YS, Yeong YF, Othman NH, Goh PS, Ismail AF. Development of Ultrahigh Permeance Hollow Fiber Membranes via Simple Surface Coating for CO 2/CH 4 Separation. Molecules 2022; 27:molecules27238381. [PMID: 36500475 PMCID: PMC9738885 DOI: 10.3390/molecules27238381] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2022] [Revised: 11/26/2022] [Accepted: 11/27/2022] [Indexed: 12/05/2022] Open
Abstract
Most researchers focused on developing highly selective membranes for CO2/CH4 separation, but their developed membranes often suffered from low permeance. In this present work, we aimed to develop an ultrahigh permeance membrane using a simple coating technique to overcome the trade-off between membrane permeance and selectivity. A commercial silicone membrane with superior permeance but low CO2/CH4 selectivity (in the range of 2-3) was selected as the host for surface modification. Our results revealed that out of the three silane agents tested, only tetraethyl orthosilicate (TEOS) improved the control membrane's permeance and selectivity. This can be due to its short structural chain and better compatibility with the silicone substrate. Further investigation revealed that higher CO2 permeance and selectivity could be attained by coating the membrane with two layers of TEOS. The surface integrity of the TEOS-coated membrane was further improved when an additional polyether block amide (Pebax) layer was established atop the TEOS layer. This additional layer sealed the pin holes of the TEOS layer and enhanced the resultant membrane's performance, achieving CO2/CH4 selectivity of ~19 at CO2 permeance of ~2.3 × 105 barrer. This performance placed our developed membrane to surpass the 2008 Robeson Upper Boundary.
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Affiliation(s)
- Noresah Said
- Advanced Membrane Technology Research Centre (AMTEC), Faculty of Chemical and Energy Engineering, Universiti Teknologi Malaysia, Skudai 81310, Johor, Malaysia
| | - Kar Chun Wong
- Advanced Membrane Technology Research Centre (AMTEC), Faculty of Chemical and Energy Engineering, Universiti Teknologi Malaysia, Skudai 81310, Johor, Malaysia
| | - Woei Jye Lau
- Advanced Membrane Technology Research Centre (AMTEC), Faculty of Chemical and Energy Engineering, Universiti Teknologi Malaysia, Skudai 81310, Johor, Malaysia
- Correspondence:
| | - Ying Siew Khoo
- Advanced Membrane Technology Research Centre (AMTEC), Faculty of Chemical and Energy Engineering, Universiti Teknologi Malaysia, Skudai 81310, Johor, Malaysia
| | - Yin Fong Yeong
- Department of Chemical Engineering, Universiti Teknologi PETRONAS, Bandar Seri Iskandar 32610, Perak, Malaysia
| | - Nur Hidayati Othman
- Department of Oil and Gas Engineering, School of Chemical Engineering, College of Engineering, Universiti Teknologi MARA, Shah Alam 40450, Selangor, Malaysia
| | - Pei Sean Goh
- Advanced Membrane Technology Research Centre (AMTEC), Faculty of Chemical and Energy Engineering, Universiti Teknologi Malaysia, Skudai 81310, Johor, Malaysia
| | - Ahmad Fauzi Ismail
- Advanced Membrane Technology Research Centre (AMTEC), Faculty of Chemical and Energy Engineering, Universiti Teknologi Malaysia, Skudai 81310, Johor, Malaysia
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5
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Che Jalil NA, Othman NH, Wan Abdul Rahman WF, Zakaria AD, Samsudin AHZ, Mohd Nafi SN, Mazuki NAN. Colorectal cancer in patient younger than 50-year-old in Kelantan: Two case reports. Malays J Pathol 2022; 44:285-290. [PMID: 36043592] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Although young-onset colorectal cancer (CRC) is commonly linked to genetic predispositions such as Lynch syndrome, there has been an increasing trend in the prevalence of sporadic type youngonset CRC. We highlighted two cases of young patients diagnosed with CRC. Both patients came at the late stage of presentation with right sided colon tumour and local lymph nodes involvement. Loss of MLH1 expression with positive BRAF V600E was seen on immunohistochemistry staining. Additionally, they have no chronic disease or familial history of malignancy. The follow-up surveillance CT scan and the surveillance colonoscopy of case 1 showed no local recurrence and distant metastasis. However, another patient defaulted on the subsequent follow-up. In this report, we review the clinicopathological characteristics of these two cases and discuss the importance of the screening for the BRAF V600E and the four MMR proteins to characterise the sporadic and hereditary subgroups of young-onset CRC.
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Affiliation(s)
- N A Che Jalil
- Universiti Sains Malaysia, School of Medical Sciences, Department of Pathology, Health Campus, Kubang Kerian, Kelantan, Malaysia.
| | - N H Othman
- Universiti Sains Malaysia, School of Medical Sciences, Department of Pathology, Health Campus, Kubang Kerian, Kelantan, Malaysia
| | - W F Wan Abdul Rahman
- Universiti Sains Malaysia, School of Medical Sciences, Department of Pathology, Health Campus, Kubang Kerian, Kelantan, Malaysia
| | - A D Zakaria
- Universiti Sains Malaysia, School of Medical Sciences, Department of Surgery, Health Campus, Kubang Kerian, Kelantan, Malaysia
| | - A H Z Samsudin
- Universiti Sains Malaysia, School of Medical Sciences, Department of Radiology, Health Campus, Kubang Kerian, Kelantan, Malaysia
| | - S N Mohd Nafi
- Universiti Sains Malaysia, School of Medical Sciences, Department of Pathology, Health Campus, Kubang Kerian, Kelantan, Malaysia
| | - N A N Mazuki
- Hospital Universiti Sains Malaysia, Kubang Kerian, Kelantan, Malaysia
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Baharudin L, Rahmat N, Othman NH, Shah N, Syed-Hassan SSA. Formation, control, and elimination of carbon on Ni-based catalyst during CO2 and CH4 conversion via dry reforming process: A review. J CO2 UTIL 2022. [DOI: 10.1016/j.jcou.2022.102050] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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Ahmad Rizal Lim FN, Marpani F, Anak Dilol VE, Mohamad Pauzi S, Othman NH, Alias NH, Nik Him NR, Luo J, Abd Rahman N. A Review on the Design and Performance of Enzyme-Aided Catalysis of Carbon Dioxide in Membrane, Electrochemical Cell and Photocatalytic Reactors. Membranes (Basel) 2021; 12:membranes12010028. [PMID: 35054554 PMCID: PMC8778536 DOI: 10.3390/membranes12010028] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/09/2021] [Revised: 11/28/2021] [Accepted: 12/04/2021] [Indexed: 11/17/2022]
Abstract
Multi-enzyme cascade catalysis involved three types of dehydrogenase enzymes, namely, formate dehydrogenase (FDH), formaldehyde dehydrogenase (FaldDH), alcohol dehydrogenase (ADH), and an equimolar electron donor, nicotinamide adenine dinucleotide (NADH), assisting the reaction is an interesting pathway to reduce thermodynamically stable molecules of CO2 from the atmosphere. The biocatalytic sequence is interesting because it operates under mild reaction conditions (low temperature and pressure) and all the enzymes are highly selective, which allows the reaction to produce three basic chemicals (formic acid, formaldehyde, and methanol) in just one pot. There are various challenges, however, in applying the enzymatic conversion of CO2, namely, to obtain high productivity, increase reusability of the enzymes and cofactors, and to design a simple, facile, and efficient reactor setup that will sustain the multi-enzymatic cascade catalysis. This review reports on enzyme-aided reactor systems that support the reduction of CO2 to methanol. Such systems include enzyme membrane reactors, electrochemical cells, and photocatalytic reactor systems. Existing reactor setups are described, product yields and biocatalytic productivities are evaluated, and effective enzyme immobilization methods are discussed.
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Affiliation(s)
- Fatin Nasreen Ahmad Rizal Lim
- School of Chemical Engineering, College of Engineering, Universiti Teknologi MARA, Shah Alam 40450, Malaysia; (F.N.A.R.L.); (V.E.A.D.); (S.M.P.); (N.H.O.); (N.H.A.); (N.R.N.H.); (N.A.R.)
| | - Fauziah Marpani
- School of Chemical Engineering, College of Engineering, Universiti Teknologi MARA, Shah Alam 40450, Malaysia; (F.N.A.R.L.); (V.E.A.D.); (S.M.P.); (N.H.O.); (N.H.A.); (N.R.N.H.); (N.A.R.)
- Catalysis for Sustainable Water and Energy Nexus Research Group, School of Chemical Engineering, College of Engineering, Universiti Teknologi MARA, Shah Alam 40450, Malaysia
- Correspondence: ; Tel.: +60-35543-6510; Fax: +60-35543-6300
| | - Victoria Eliz Anak Dilol
- School of Chemical Engineering, College of Engineering, Universiti Teknologi MARA, Shah Alam 40450, Malaysia; (F.N.A.R.L.); (V.E.A.D.); (S.M.P.); (N.H.O.); (N.H.A.); (N.R.N.H.); (N.A.R.)
| | - Syazana Mohamad Pauzi
- School of Chemical Engineering, College of Engineering, Universiti Teknologi MARA, Shah Alam 40450, Malaysia; (F.N.A.R.L.); (V.E.A.D.); (S.M.P.); (N.H.O.); (N.H.A.); (N.R.N.H.); (N.A.R.)
| | - Nur Hidayati Othman
- School of Chemical Engineering, College of Engineering, Universiti Teknologi MARA, Shah Alam 40450, Malaysia; (F.N.A.R.L.); (V.E.A.D.); (S.M.P.); (N.H.O.); (N.H.A.); (N.R.N.H.); (N.A.R.)
- Catalysis for Sustainable Water and Energy Nexus Research Group, School of Chemical Engineering, College of Engineering, Universiti Teknologi MARA, Shah Alam 40450, Malaysia
| | - Nur Hashimah Alias
- School of Chemical Engineering, College of Engineering, Universiti Teknologi MARA, Shah Alam 40450, Malaysia; (F.N.A.R.L.); (V.E.A.D.); (S.M.P.); (N.H.O.); (N.H.A.); (N.R.N.H.); (N.A.R.)
- Catalysis for Sustainable Water and Energy Nexus Research Group, School of Chemical Engineering, College of Engineering, Universiti Teknologi MARA, Shah Alam 40450, Malaysia
| | - Nik Raikhan Nik Him
- School of Chemical Engineering, College of Engineering, Universiti Teknologi MARA, Shah Alam 40450, Malaysia; (F.N.A.R.L.); (V.E.A.D.); (S.M.P.); (N.H.O.); (N.H.A.); (N.R.N.H.); (N.A.R.)
| | - Jianquan Luo
- State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;
| | - Norazah Abd Rahman
- School of Chemical Engineering, College of Engineering, Universiti Teknologi MARA, Shah Alam 40450, Malaysia; (F.N.A.R.L.); (V.E.A.D.); (S.M.P.); (N.H.O.); (N.H.A.); (N.R.N.H.); (N.A.R.)
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Zulkefli NF, Alias NH, Jamaluddin NS, Abdullah N, Abdul Manaf SF, Othman NH, Marpani F, Mat-Shayuti MS, Kusworo TD. Recent Mitigation Strategies on Membrane Fouling for Oily Wastewater Treatment. Membranes (Basel) 2021; 12:26. [PMID: 35054552 PMCID: PMC8780462 DOI: 10.3390/membranes12010026] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/01/2021] [Revised: 11/23/2021] [Accepted: 11/23/2021] [Indexed: 11/30/2022]
Abstract
The discharge of massive amounts of oily wastewater has become one of the major concerns among the scientific community. Membrane filtration has been one of the most used methods of treating oily wastewater due to its stability, convenience handling, and durability. However, the continuous occurrence of membrane fouling aggravates the membrane's performance efficiency. Membrane fouling can be defined as the accumulation of various materials in the pores or surface of the membrane that affect the permeate's quantity and quality. Many aspects of fouling have been reviewed, but recent methods for fouling reduction in oily wastewater have not been explored and discussed sufficiently. This review highlights the mitigation strategies to reduce membrane fouling from oily wastewater. We first review the membrane technology principle for oily wastewater treatment, followed by a discussion on different fouling mechanisms of inorganic fouling, organic fouling, biological fouling, and colloidal fouling for better understanding and prevention of membrane fouling. Recent mitigation strategies to reduce fouling caused by oily wastewater treatment are also discussed.
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Affiliation(s)
- Nur Fatihah Zulkefli
- Department of Oil and Gas Engineering, School of Chemical Engineering, College of Engineering, Universiti Teknologi MARA, Shah Alam 40450, Malaysia; (N.F.Z.); (N.S.J.); (S.F.A.M.); (N.H.O.); (F.M.); (M.S.M.-S.)
| | - Nur Hashimah Alias
- Department of Oil and Gas Engineering, School of Chemical Engineering, College of Engineering, Universiti Teknologi MARA, Shah Alam 40450, Malaysia; (N.F.Z.); (N.S.J.); (S.F.A.M.); (N.H.O.); (F.M.); (M.S.M.-S.)
| | - Nur Shafiqah Jamaluddin
- Department of Oil and Gas Engineering, School of Chemical Engineering, College of Engineering, Universiti Teknologi MARA, Shah Alam 40450, Malaysia; (N.F.Z.); (N.S.J.); (S.F.A.M.); (N.H.O.); (F.M.); (M.S.M.-S.)
| | - Norfadhilatuladha Abdullah
- Advanced Membrane Technology Research Centre (AMTEC), School of Chemical and Energy Engineering, Universiti Teknologi Malaysia (UTM), Johor Bahru 81310, Malaysia;
| | - Shareena Fairuz Abdul Manaf
- Department of Oil and Gas Engineering, School of Chemical Engineering, College of Engineering, Universiti Teknologi MARA, Shah Alam 40450, Malaysia; (N.F.Z.); (N.S.J.); (S.F.A.M.); (N.H.O.); (F.M.); (M.S.M.-S.)
| | - Nur Hidayati Othman
- Department of Oil and Gas Engineering, School of Chemical Engineering, College of Engineering, Universiti Teknologi MARA, Shah Alam 40450, Malaysia; (N.F.Z.); (N.S.J.); (S.F.A.M.); (N.H.O.); (F.M.); (M.S.M.-S.)
| | - Fauziah Marpani
- Department of Oil and Gas Engineering, School of Chemical Engineering, College of Engineering, Universiti Teknologi MARA, Shah Alam 40450, Malaysia; (N.F.Z.); (N.S.J.); (S.F.A.M.); (N.H.O.); (F.M.); (M.S.M.-S.)
| | - Muhammad Shafiq Mat-Shayuti
- Department of Oil and Gas Engineering, School of Chemical Engineering, College of Engineering, Universiti Teknologi MARA, Shah Alam 40450, Malaysia; (N.F.Z.); (N.S.J.); (S.F.A.M.); (N.H.O.); (F.M.); (M.S.M.-S.)
| | - Tutuk Djoko Kusworo
- Department of Chemical Engineering, Faculty of Engineering, Diponegoro University, Semarang 50275, Indonesia;
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Zahirulain AS, Marpani F, Pauzi SM, Rahim 'NCA, Cao HTT, Alias NH, Othman NH. Assessing Enzyme Immobilization on Reverse Asymmetric Membranes and Biocatalytic Reactor Performance.. [DOI: 10.21203/rs.3.rs-931423/v1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
Abstract
Abstract
Integration of membrane filtration and biocatalysis has appealing benefits in terms of simultaneous substrate conversion and product separation in one reactor. Nevertheless, the interaction between enzymes and membrane is complex and the mechanism of enzyme docking on membrane is similar to membrane fouling. In this study, focus is given on the assessment of enzyme immobilization mechanism on reverse asymmetric polymer membrane based on the permeate flux data during the procedure. Evaluation of membrane performance in terms of its permeability, fouling mechanisms, enzyme loading, enzyme reusability and biocatalytic productivity were also conducted. Alcohol Dehydrogenase (EC 1.1.1.1), able to catalyze formaldehyde to methanol with subsequent oxidation of NADH to NAD was selected as the model enzyme. Two commercial, asymmetric, flat sheet polymer membranes (PES and PVDF) were immobilized with the enzyme in the reverse mode. Combination of concentration polarization phenomenon and pressure driven filtration successfully immobilized almost 100% of the enzymes in the feed solutions. The biocatalytic membrane reactor recorded more than 90% conversion, stable permeate flux with no enzyme leaching even after 5 cycles. The technique showing promising results to be expanded to continuous membrane separation setup for repeated use of enzymes.
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Mat-Shayuti MS, Tuan Ya TMYS, Abdullah MZ, Othman NH, Alias NH. Exploring the effect of ultrasonic power, frequency, and load toward remediation of oil-contaminated beach and oilfield sands using ANOVA. Environ Sci Pollut Res Int 2021; 28:58081-58091. [PMID: 34106401 DOI: 10.1007/s11356-021-14776-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/13/2021] [Accepted: 06/02/2021] [Indexed: 06/12/2023]
Abstract
Despite the potential shown by previous investigations on the use of ultrasound for the remediation of oil-contaminated sand, the influence and interactions among ultrasonic parameters and oily sand are unclear, leading to possible ineffective treatment and high-power consumption. In order to improve the process efficiency, this work analyzes the effects of ultrasonic power, frequency, and load toward the cleaning of crude oil-contaminated sand, using two different sample positions and sand types. Crude oil-contaminated beach sand and produced sand from offshore oil well were used as samples. They were cleaned in custom-made ultrasonic bath reactor for 10 min with power from 30 to 120 W, frequency covering 25-60 kHz, and sand load of 10-100 g. With experimental design consisting multiple factors and levels, the interactions between factors in all possible combinations were determined using ANOVA (n = 210). From p-value based at 95% confidence interval and extensive F test, the three most significant factors were the sand type, the ultrasonic frequency, and the interaction between sand type and frequency. The best setting for suspended samples involved high frequency of 60 kHz, whereas bottom samples preferred low frequency at 28 kHz. This finding was justified when the acoustic pressure attenuation, standing wave pattern, and surface pitting/cracking were found in correlation with the cleaning results. Overall, the maximum treatment under ultrasonic bath solely gained around 60%, improvable by hybrid cleaning with other techniques such as chemical, biological, mechanical, and thermal.
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Affiliation(s)
- Muhammad Shafiq Mat-Shayuti
- Mechanical Engineering Department, Universiti Teknologi PETRONAS, 32610, Perak, Malaysia.
- School of Chemical Engineering, Universiti Teknologi MARA, 40450, Selangor, Malaysia.
| | - Tuan Mohammad Yusoff Shah Tuan Ya
- Mechanical Engineering Department, Universiti Teknologi PETRONAS, 32610, Perak, Malaysia
- High Performance Computing Centre, Universiti Teknologi PETRONAS, 32610, Perak, Malaysia
| | - Mohamad Zaki Abdullah
- Mechanical Engineering Department, Universiti Teknologi PETRONAS, 32610, Perak, Malaysia
| | - Nur Hidayati Othman
- School of Chemical Engineering, Universiti Teknologi MARA, 40450, Selangor, Malaysia
| | - Nur Hashimah Alias
- School of Chemical Engineering, Universiti Teknologi MARA, 40450, Selangor, Malaysia
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Ch'ng ES, Othman NH. The journey of Malaysian external quality assurance program for general diagnostic histopathology. Malays J Pathol 2021; 43:19-23. [PMID: 33903301] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
International Academy of Pathology, Malaysian Division has initiated and run the external quality assurance program for general diagnostic histopathology since the year 2017. This article introduces the educational philosophy of this external quality assurance program and the technicalities in running such a national program. Challenges in ensuring the successful running of this program to gain wide acceptance by histopathology laboratories in Malaysia as well as experience in overcoming these challenges are detailed. This article charts the future direction of this external quality assurance program.
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Affiliation(s)
- E S Ch'ng
- Advanced Medical and Dental Institute (AMDI), Universiti Sains Malaysia, 13200 Bertam, Kepala Batas, Penang Malaysia.
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Jamil N, Othman NH, Mohd Zaini MH, Alias NH, Shahruddin MZ, Lau WJ, Ismail AF, Md Nordin NAH. Green one-pot synthesis and characterisation of hybrid reduced graphene oxide/zeolitic imidazole framework-8 (rGO/ZIF-8). J IRAN CHEM SOC 2021. [DOI: 10.1007/s13738-020-02032-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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Bahari NM, Che Mohamed Hussein SN, Othman NH. Synthesis of Al 2O 3–SiO 2/water hybrid nanofluids and effects of surfactant toward dispersion and stability. Particulate Science and Technology 2020. [DOI: 10.1080/02726351.2020.1838015] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
| | | | - Nur Hidayati Othman
- Faculty of Chemical Engineering, Universiti Teknologi MARA, Shah Alam, Malaysia
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14
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Hussain MH, Abu Bakar NF, Mustapa AN, Low KF, Othman NH, Adam F. Synthesis of Various Size Gold Nanoparticles by Chemical Reduction Method with Different Solvent Polarity. Nanoscale Res Lett 2020; 15:140. [PMID: 32617698 PMCID: PMC7332595 DOI: 10.1186/s11671-020-03370-5] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2019] [Accepted: 06/21/2020] [Indexed: 05/22/2023]
Abstract
Complicated and strict protocols are followed to tune the size of gold nanoparticles (GNPs) in chemical synthesis methods. In this study, we address the polarity of solvents as a tool for tailoring the size of GNPs in the chemical reduction method. The effects of varying polarity index of the reaction medium on synthesizing gold nanoparticles by chemical reduction method have been investigated. Ethanol as a polar solvent, ethanol-water mixture as reaction medium, L-ascorbic acid as reducing agent, and polyvinylpyrrolidone as stabilizer were used to synthesize GNPs. The polarity index of the reaction medium was adjusted by changing the volume ratio of ethanol to water. UV-Vis, dynamic light scattering (DLS), and transmission electron microscopy (TEM) characterizations reveal that the growth of nanoparticles was gradually increased (~ 22 to 219 nm hydrodynamic diameter) with decreasing value of polarity index of the reaction medium (~ 8.2 to 5.2). Furthermore, the high polarity index of the reaction medium produced smaller and spherical nanoparticles, whereas lower polarity index of reaction medium results in bigger size of GNPs with different shapes. These results imply that the mechanistic of the growth, assembly, and aggregation phenomena of ligand or stabilizer-capped GNPs strongly rely on the polarity of solvent molecules. Using the proposed methodology, wide size range of GNPs with different morphology sizes can be synthesized by simply modulating the volume percentage of organic solvent in the reaction medium.
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Affiliation(s)
- Mohamed Hasaan Hussain
- Faculty of Chemical Engineering, Universiti Teknologi MARA, 40450, Shah Alam, Selangor, Malaysia
| | - Noor Fitrah Abu Bakar
- Faculty of Chemical Engineering, Universiti Teknologi MARA, 40450, Shah Alam, Selangor, Malaysia.
| | - Ana Najwa Mustapa
- Faculty of Chemical Engineering, Universiti Teknologi MARA, 40450, Shah Alam, Selangor, Malaysia
| | - Kim-Fatt Low
- Faculty of Applied Science, Universiti Teknologi MARA, Tapah Campus, 35400 Tapah Road, Perak, Malaysia
| | - Nur Hidayati Othman
- Faculty of Chemical Engineering, Universiti Teknologi MARA, 40450, Shah Alam, Selangor, Malaysia
| | - Fatmawati Adam
- Faculty of Chemical and Process Engineering Technology, Universiti Malaysia Pahang, Lebuh Raya Tun Razak, 26300, Gambang, Pahang, Malaysia
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Othman NH, Lee KY, Radzol ARM, Mansor W. Optimal ELM-RBF model and SERS Analysis of Saliva for Classification of NS1. Annu Int Conf IEEE Eng Med Biol Soc 2020; 2019:3551-3554. [PMID: 31946645 DOI: 10.1109/embc.2019.8857281] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Extreme Learning Machine (ELM) with Radial Basis Function (RBF) Kernel has demonstrated strong capability in pattern recognition and classification problems. NS1 is a biomarker for flavivirus related diseases, where current detection methods are serum based and hence invasive. Our previous work has captured NS1 molecular fingerprint in saliva using Surface Enhanced Raman Spectroscopy (SERS) that could amount to non-invasive detection method. SERS is an improved Raman spectroscopic technique, which can amplify spectral intensity by 103 to l07 times, to yield usable spectra of low concentration NS1 in saliva. The spectra produced contain 1801 features for each of the 284 samples collected. Principal Component Analysis (PCA) transforms a high dimensional data to a lower dimension principal components (PCs), at no sacrifice of important information of the original data. Both termination criteria of PCA and kernel parameters of ELM have effect on performance of the classifier models. This paper aims to unravel an optimal ELM-RBF classifier model for classification of NS1 salivary SERS spectra. Performance of a total of 864 classifier models are examined and compared in terms of [accuracy, kappa, precision, sensitivity and specificity]. Results show that CPV- and EOC-ELM-RBF classifier models are on par and outperform the Scree-ELM-RBF classifier models.
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16
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Ismail FH, Marpani F, Othman NH, Nik Him NR. Simultaneous separation and biocatalytic conversion of formaldehyde to methanol in enzymatic membrane reactor. CHEM ENG COMMUN 2019. [DOI: 10.1080/00986445.2019.1705795] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- Farazatul Harnani Ismail
- Integrated Separation Technology Research Group (i-STRonG), Faculty of Chemical Engineering, Universiti Teknologi MARA, Shah Alam, Selangor, Malaysia
| | - Fauziah Marpani
- Integrated Separation Technology Research Group (i-STRonG), Faculty of Chemical Engineering, Universiti Teknologi MARA, Shah Alam, Selangor, Malaysia
| | - Nur Hidayati Othman
- Membrane Technology Research Group, Faculty of Chemical Engineering, Universiti Teknologi MARA, Shah Alam, Selangor, Malaysia
| | - Nik Raikhan Nik Him
- Industrial Process Reliability & Sustainability (INPRES), Faculty of Chemical Engineering, Universiti Teknologi MARA, Shah Alam, Selangor, Malaysia
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Mat-Shayuti MS, Tuan Ya TMYS, Abdullah MZ, Megat Khamaruddin PNF, Othman NH. Progress in ultrasonic oil-contaminated sand cleaning: a fundamental review. Environ Sci Pollut Res Int 2019; 26:26419-26438. [PMID: 31327143 DOI: 10.1007/s11356-019-05954-w] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/14/2018] [Accepted: 07/11/2019] [Indexed: 06/10/2023]
Abstract
Steady efforts in using ultrasonic energy to treat oil-contaminated sand started in the early 2000s until today, although pilot studies on the area can be traced to even earlier dates. Owing to the unique characteristics of the acoustic means, the separation of oil from sand has been showing good results in laboratories. This review provides the compilation of researches and insights into the mechanism of separation thus far. Related topics in the areas of oil-contaminated sand characterizations, fundamental ultrasonic cleaning, and cavitation effects are also addressed. Nevertheless, many of the documented works are only at laboratory or pilot-scale level, and the comprehensive interaction between ultrasonic parameters towards cleaning efficiencies may not have been fully unveiled. Gaps and opportunities are also presented at the end of this article.
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Affiliation(s)
- Muhammad Shafiq Mat-Shayuti
- Mechanical Engineering Department, Universiti Teknologi PETRONAS, 32610, Seri Iskandar, Perak, Malaysia.
- Faculty of Chemical Engineering, Universiti Teknologi MARA, 40450, Shah Alam, Selangor, Malaysia.
| | | | - Mohamad Zaki Abdullah
- Mechanical Engineering Department, Universiti Teknologi PETRONAS, 32610, Seri Iskandar, Perak, Malaysia
| | | | - Nur Hidayati Othman
- Faculty of Chemical Engineering, Universiti Teknologi MARA, 40450, Shah Alam, Selangor, Malaysia
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18
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Othman NH, Radzol ARM, Lee KY, Mansor W. Reduced Featured k-NN Classifier Model Optimal for Classification of Dengue Fever from Salivary Raman Spectra. Annu Int Conf IEEE Eng Med Biol Soc 2019; 2019:471-474. [PMID: 31945940 DOI: 10.1109/embc.2019.8856427] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Current diagnostic methods based on nonstructural protein 1 (NS1) for dengue infection use blood as the medium and hence are invasive. Worry for blood infected diseases, pain from pricking, overcrowded public hospitals and ignorance are just a few of the causes for delayed diagnosis that contributes to mortality from dengue fever (DF). NS1 has also been reported in saliva, but sensitivity of detection is much lower than that of blood. If saliva is to be a medium, detection of NS1 requires a more specific and sensitive technique. In this study, we are exploiting the advantages of saliva and Surface Enhanced Raman Spectroscopy (SERS) to develop a non-invasive early detection method for DF. Significant features from Raman spectra of saliva samples of dengue suspected patients and healthy volunteers were extracted with Principal Component Analysis (PCA) and served as input to k-Nearest Neighbour (k-NN) for classification. Cumulative Percentage Variance (CPV) is the criterion for feature extraction. Two k-NN distance rules (Cosine and Manhattan) combined with k-values ranging from 3 to 17 were varied to obtain an optimal k-NN classifier. Then, performance of the different k-NN classifier models is benchmarked against Panbio Dengue Early ELISA and SD BIOLINE Dengue Duo technique from the clinical laboratory. The finding is encouraging with the best performance achieved, 82.14% for accuracy, 85.71% for sensitivity and 78.57% for specificity.
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Junaidi NFD, Othman NH, Shahruddin MZ, Alias NH, Lau WJ, Ismail AF. Effect of graphene oxide (GO) and polyvinylpyrollidone (PVP) additives on the hydrophilicity of composite polyethersulfone (PES) membrane. Mal J Fund Appl Sci 2019. [DOI: 10.11113/mjfas.v15n3.1209] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Membrane based separation system is considered as a promising technology to purify water, owing to its simplicity and efficiency in operation. However, the application is limited by membrane fouling, which can lead to the declination of water flux and premature failure of membrane. The fouling can be controlled through membrane surface modification by blending hydrophilic materials during the casting solution preparation. Polyethersulfone (PES) membrane is naturally hydrophobic due to lack of oxygen functional group, which limits its application in the filtration of water. Therefore, modification of PES-based membranes is required. In this work, modification of the PES membrane was carried out by incorporating carbon-based nanomaterials (graphene oxide (GO)) and a well-known organic polymer (polyvinylpyrrolidone (PVP)). The effect of each additive toward the hydrophilicity of composite PES membrane was then investigated. GO was synthesized using modified Hummers method due to its simpler and shorter process. Each additive was added during the casting solution preparation and the amount added was varied from 0.5 to 1.0 wt%. The resultant composite PES membranes were characterized using XRD, FTIR and TGA prior to hydrophilicity and pure water flux (PWF) measurement. It was observed that the additives (PVP and GO) have significantly affected the membranes hydrophilicity, resulting in lower contact angle and higher pure water flux. The highest value of PWF (230 L/m2.h) with lowest contact angle (42 °) were observed for PES-1.0GOPVP membrane due to high amount of GO and PVP. Improved PWF performance of composite PES-1.0GOPVP membrane was attributed to the better dispersibility of the PVP and GO and increased surface hydrophilicity of the modified composite membranes. This study indicated that PVP and GO are effective modifiers to enhance the performance of PES membrane
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Mohd Nafi SN, Siti Azrin AH, Mat Zin AA, Othman NH, Che Jalil NA. Expression of IGFBP-rP1 in ovarian and breast cancers in association with diabetes mellitus status. Malays J Pathol 2019; 41:33-39. [PMID: 31025635] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
INTRODUCTION Insulin-like growth factor binding protein-related protein 1 (IGFBP-rP1) is an important component of the IGF system that regulates insulin resistance-related to tumour development. The aim of this study is to investigate the expression of IGFBP-rP1 among female cancer patients who are known or not known to have Type 2 Diabetes Mellitus (T2DM). MATERIALS AND METHODS Using a cross-sectional design, cases of ovarian and breast cancer with clinical status of T2DM were selected over a 10-year period in Hospital Universiti Sains Malaysia. Immunohistochemical staining for IGFBP-rP1 was performed on paraffin-embedded tissues and the results were correlated with the patient's demographic and clinicopathological data. RESULTS A total of 152 breast cancer patients were recruited into the current study with 33.5% (51/152) patients were positive T2DM. Most of the breast cancer patients with T2DM were IGFBP-rP1-negative (66.7%, 34/51). The IGFBP-rP1 expression was significantly difference between breast cancer subjects with and without T2DM (p<0.001). There was no significant association of IGFBP-rP1 expression with data on the demographic and clinicopathological profiles of patients with breast cancer. Meanwhile, positive IGFBP-rP1 expression was evident in 44 out of 108 (40.74%) ovarian cancer cases. Among these cases, 36 were T2DM. In contrast to breast cancer cases, IGFBP-rP1 was mostly expressed among ovarian cancer patients with T2DM (66.7%, 24/36, p < 0.001). However, the -positive expression was not significantly associated with any sociodemographic and clinicopathological features of ovarian cancers. CONCLUSIONS Majority of breast cancer patients with T2DM did not express IGFBP-rP1. In contrast, majority of the ovarian cancer patients with T2DM expressed IGFBP-rP1.
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Affiliation(s)
- S N Mohd Nafi
- Universiti Sains Malaysia, School of Medical Sciences, Department of Pathology, Health Campus, 16150 Kota Bharu, Kelantan, Malaysia.
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21
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Jarni HH, Zin RM, Bakar NFA, Rahman NA, Shaari NZK, Othman NH. Characteristic and Erosion Study of Uncoated Sand Proppant Using Impingement Test. KEM 2019; 797:240-246. [DOI: 10.4028/www.scientific.net/kem.797.240] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
Abstract
The characterization and properties of sand from beaches in Malaysia that has potential to be used as proppant in hydraulic fracturing was investigated through impingement tests. Eight sand samples were obtained from eight different locations in Malaysia; three samples from West Coastal beaches (Selangor) and five from East Coastal beaches (Kelantan). These impingement tests were conducted by varying several parameters i.e. size ranges of sand, type of targeted metal and distance of nozzle standoff from target. In these tests, air was fed through an acrylic pipe with inner diameter of 8 mm and 4 m length at gas velocity of 100 m/s and flow rate of 200 l/min. 250 g of sand samples were fed in compressed air stream and the samples were projected toward targeted metal i.e. mild steel and aluminium with a 90° of impingement angle. These tests were conducted at different separation distance of 0.5, 2.5 and 5.0 inches of nozzle and target. The results were analysed by measuring the mass loss of the metals after impingement and the images of the impinged metals were captured using camera. The highest metal loss was obtained when the targeted metal was impacted with the largest size range of sand samples. The mass loss of mild steel ranged from 0.03 to 0.16 g and 0.10 to 0.22 g for aluminium, at a variable distance between the nozzle and metal target due to higher hardness of mild steel than aluminium. The mass loss reduced when the distance between nozzle and metal target increased due to energy loss because of the inter particle collision.
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Jamil N, Othman NH, Alias NH, Shahruddin MZ, Roslan RA, Lau WJ, Ismail AF. Mixed matrix membranes incorporated with reduced graphene oxide (rGO) and zeolitic imidazole framework-8 (ZIF-8) nanofillers for gas separation. J SOLID STATE CHEM 2019. [DOI: 10.1016/j.jssc.2018.11.028] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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23
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Nurliyana Che Mohamed Hussein S, Hidayati Othman N, Dollah A, Nazihah Che Abdul Rahim A, Shuhadah Japperi N, Syamimi Mohd Asymawi Ramakrishnan N. Study of Acid Treated Mixed Sawdust as Natural Oil Sorbent for Oil Spill. ACTA ACUST UNITED AC 2019. [DOI: 10.1016/j.matpr.2019.11.156] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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24
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Alias NH, Jaafar J, Samitsu S, Yusof N, Othman MHD, Rahman MA, Ismail AF, Aziz F, Salleh WNW, Othman NH. Photocatalytic degradation of oilfield produced water using graphitic carbon nitride embedded in electrospun polyacrylonitrile nanofibers. Chemosphere 2018; 204:79-86. [PMID: 29653325 DOI: 10.1016/j.chemosphere.2018.04.033] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/10/2017] [Revised: 02/25/2018] [Accepted: 04/05/2018] [Indexed: 06/08/2023]
Abstract
Separation and purification of oilfield produced water (OPW) is a major environmental challenge due to the co-production of the OPW during petroleum exploration and production operations. Effective capture of oil contaminant and its in-situ photodegradation is one of the promising methods to purify the OPW. Based on the photocatalytic capability of graphitic carbon nitride (GCN) which was recently rediscovered, photodegradation capability of GCN for OPW was investigated in this study. GCN was synthesized by calcination of urea and further exfoliated into nanosheets. The GCNs were incorporated into polyacrylonitrile nanofibers using electrospinning, which gave a liquid-permeable self-supporting photocatalytic nanofiber mat that can be handled by hand. The photocatalytic nanofiber demonstrated 85.4% degradation of OPW under visible light irradiation, and improved the degradation to 96.6% under UV light. Effective photodegradation of the photocatalytic nanofiber for OPW originates from synergetic effects of oil adsorption by PAN nanofibers and oil photodegradation by GCNs. This study provides an insight for industrial application on purification of OPW through photocatalytic degradation under solar irradiation.
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Affiliation(s)
- Nur Hashimah Alias
- Advanced Membrane Technology Research Center (AMTEC), Universiti Teknologi Malaysia, 81310, Skudai, Johor, Malaysia; Department of Oil and Gas Engineering, Faculty of Chemical Engineering, Universiti Teknologi MARA, 40450 Shah Alam, Selangor, Malaysia
| | - Juhana Jaafar
- Advanced Membrane Technology Research Center (AMTEC), Universiti Teknologi Malaysia, 81310, Skudai, Johor, Malaysia.
| | - Sadaki Samitsu
- Data driven Polymer Design Group, Center for Materials Research by Information Integration, National Institute for Materials Science (NIMS), 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan
| | - Norhaniza Yusof
- Advanced Membrane Technology Research Center (AMTEC), Universiti Teknologi Malaysia, 81310, Skudai, Johor, Malaysia
| | - Mohd Hafiz Dzarfan Othman
- Advanced Membrane Technology Research Center (AMTEC), Universiti Teknologi Malaysia, 81310, Skudai, Johor, Malaysia
| | - Mukhlis A Rahman
- Advanced Membrane Technology Research Center (AMTEC), Universiti Teknologi Malaysia, 81310, Skudai, Johor, Malaysia
| | - Ahmad Fauzi Ismail
- Advanced Membrane Technology Research Center (AMTEC), Universiti Teknologi Malaysia, 81310, Skudai, Johor, Malaysia
| | - Farhana Aziz
- Advanced Membrane Technology Research Center (AMTEC), Universiti Teknologi Malaysia, 81310, Skudai, Johor, Malaysia
| | - Wan Norharyati Wan Salleh
- Advanced Membrane Technology Research Center (AMTEC), Universiti Teknologi Malaysia, 81310, Skudai, Johor, Malaysia
| | - Nur Hidayati Othman
- Department of Oil and Gas Engineering, Faculty of Chemical Engineering, Universiti Teknologi MARA, 40450 Shah Alam, Selangor, Malaysia
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25
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Junaidi NFD, Khalil NA, Jahari AF, Shaari NZK, Shahruddin MZ, Alias NH, Othman NH. Effect of Graphene Oxide (GO) on the Surface Morphology & Hydrophilicity of Polyethersulfone (PES). ACTA ACUST UNITED AC 2018. [DOI: 10.1088/1757-899x/358/1/012047] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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26
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Zainuddin MF, Nik Raikhan NH, Othman NH, Abdullah WFH. Synthesis of reduced Graphene Oxide (rGO) using different treatments of Graphene Oxide (GO). ACTA ACUST UNITED AC 2018. [DOI: 10.1088/1757-899x/358/1/012046] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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27
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Sihar AS, Mohd Rodzi MF, Che Abd Rahim AN, Shahruddin MZ, Alias NH, Othman NH. Preparation of Mixed Ionic Electronic Conducting (MIEC) Membrane Supported on Al 2O 3 Substrate: Effects of Substrate Morphology. IOP Conf Ser : Mater Sci Eng 2018; 358:012057. [DOI: 10.1088/1757-899x/358/1/012057] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
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28
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Shahruddin MZ, Othman NH, Alias NH, Ghani SNA. Desalination of Produced Water Using Bentonite as Pre-Treatment and Membrane Separation as Main Treatment. ACTA ACUST UNITED AC 2015. [DOI: 10.1016/j.sbspro.2015.06.237] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Affiliation(s)
| | - Zhentao Wu
- Dept. of Chemical Engineering; Imperial College London; London SW7 2AZ U.K
| | - Kang Li
- Dept. of Chemical Engineering; Imperial College London; London SW7 2AZ U.K
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31
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Wu Z, Hidayati Othman N, Zhang G, Liu Z, Jin W, Li K. Effects of fabrication processes on oxygen permeation of Nb2O5-doped SrCo0.8Fe0.2O3−δ micro-tubular membranes. J Memb Sci 2013. [DOI: 10.1016/j.memsci.2013.04.020] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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32
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Yam YY, Hoh BP, Othman NH, Hassan S, Yahya MM, Zakaria Z, Ankathil R. Somatic copy-neutral loss of heterozygosity and copy number abnormalities in Malaysian sporadic colorectal carcinoma patients. Genet Mol Res 2013; 12:319-27. [PMID: 23420356 DOI: 10.4238/2013.february.7.1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Colorectal cancer is one of the most common cancers in many countries, including Malaysia. The accumulation of genomic alterations is an important feature of colorectal carcinogenesis. A better understanding of the molecular events underlying the stages of colorectal carcinogenesis might be helpful in the detection and management of the disease. We used a commercially available single-nucleotide polymorphism genotyping array to detect both copy number abnormalities (CNAs) and copy-neutral loss of heterozygosity (LOH) in sporadic colorectal carcinomas. Matched tumor and normal tissues of 13 colorectal carcinomas (Dukes' stages A-D) were analyzed using a 250K single nucleotide polymorphism array. An additional assay was performed to determine the microsatellite instability status by using the National Cancer Institute-recommended BAT-26 panel. In general, copy number gain (92.3%) was most common, followed by copy number loss (53.8%) and copy-neutral LOH (46.2%). Frequent CNAs of gains and losses were observed on chromosomes 7p, 8, 13q, 17p, 18q, and 20q, and copy-neutral LOH was observed on chromosomes 2, 6, 12, 13q, 14q, 17, 20p, 19q, and 22q. Even though genomic alterations are associated with colorectal cancer progression, our results showed that DNA CNAs and copy-neutral LOH do not reflect disease progression in at least 50% tumors. Copy-neutral LOH was observed in both early and advanced tumors, which favors the involvement of these genomic alterations in the early stages of tumor development.
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Affiliation(s)
- Y Y Yam
- Human Genome Centre, School of Medical Sciences, Universiti Sains Malaysia, Health Campus, Kubang Kerian, Kelantan, Malaysia
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33
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Idayu MYN, Irfan M, Othman NH. Recurrent glossal leiomyoma. Med J Malaysia 2012; 67:329-330. [PMID: 23082428] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Oral leiomyomas are rare benign tumour of smooth muscle. The first case of oral leiomyoma was reported by Blanc in 1884 and since then more cases has been published following advancement in immunohistochemical study. This tumour has an excellent prognosis and recurrences are extremely rare. We report a case of a recurrent glossal leiomyoma in a patient with HIV infection and the lesion recurred one year after the first excision.
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Affiliation(s)
- M Y Nor Idayu
- Department of Otorhinolaryngology-Head & Neck Surgery, Universiti Sains Malaysia Health Campus, 16150 Kota Bharu, Kelantan, Malaysia
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34
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Ahmad FK, Deris S, Othman NH. The inference of breast cancer metastasis through gene regulatory networks. J Biomed Inform 2011; 45:350-62. [PMID: 22179053 DOI: 10.1016/j.jbi.2011.11.015] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2010] [Revised: 11/26/2011] [Accepted: 11/28/2011] [Indexed: 11/30/2022]
Abstract
Understanding the mechanisms of gene regulation during breast cancer is one of the most difficult problems among oncologists because this regulation is likely comprised of complex genetic interactions. Given this complexity, a computational study using the Bayesian network technique has been employed to construct a gene regulatory network from microarray data. Although the Bayesian network has been notified as a prominent method to infer gene regulatory processes, learning the Bayesian network structure is NP hard and computationally intricate. Therefore, we propose a novel inference method based on low-order conditional independence that extends to the case of the Bayesian network to deal with a large number of genes and an insufficient sample size. This method has been evaluated and compared with full-order conditional independence and different prognostic indices on a publicly available breast cancer data set. Our results suggest that the low-order conditional independence method will be able to handle a large number of genes in a small sample size with the least mean square error. In addition, this proposed method performs significantly better than other methods, including the full-order conditional independence and the St. Gallen consensus criteria. The proposed method achieved an area under the ROC curve of 0.79203, whereas the full-order conditional independence and the St. Gallen consensus criteria obtained 0.76438 and 0.73810, respectively. Furthermore, our empirical evaluation using the low-order conditional independence method has demonstrated a promising relationship between six gene regulators and two regulated genes and will be further investigated as potential breast cancer metastasis prognostic markers.
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Affiliation(s)
- F K Ahmad
- Graduate Department of Computer Science, Universiti Utara Malaysia, 06010 Sintok, Kedah, Malaysia.
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35
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Yasmin Anum MY, Looi ML, Nor Aini AH, Merican I, Wahidah A, Mohd Radzi AH, Nor Azizah A, Othman NH. Combined assessment of TGF-beta-1 and alpha-fetoprotein values improves specificity in the diagnosis of hepatocellular carcinoma and other chronic liver diseases in Malaysia. Med J Malaysia 2009; 64:223-227. [PMID: 20527273] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Transforming growth factor beta-1 (TGF-beta-1) is a multifunctional cytokine involved in the regulation of growth and differentiation of both normal and transformed cells. The main aim of this study was to determine whether TGF-beta-1 or alpha fetoprotein (AFP) or the combination of the two is a better indicator for hepatocellularcarcinoma (HCC). Serum TGF-beta-1 and AFP were measured by ELISA in 40 healthy subjects, 23 patients with hepatocellular carcinoma (HCC), 70 patients with hepatitis B, 26 patients with hepatitis C and 16 patients with liver cirrhosis (LC). Patients with liver diseases showed significantly higher serum TGF-beta-1 values (> 3 fold) compared to control subjects. As for serum AFP, significant elevation was only observed for HCC cases. Serum TGF-beta-1 exhibited higher percent sensitivity compared to serum AFP in all liver diseases. Combination of serum TGF-beta-1 and AFP increased specificities in all cases studied. In conclusion, serum TGF-beta-1 is a more sensitive marker for HCC when compared to serum AFP and its specificity is increased when combined with serum AFP.
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Affiliation(s)
- M Y Yasmin Anum
- Department of Biochemistry, Faculty of Medicine, Universiti Kebangsaan Malaysia Medical Center, Jalan Raja Muda Abdul Aziz, Kuala Lumpur, Malaysia.
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36
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Saini R, Shen TH, Othman NH, Santhanam J, Othman N, Tang TH. Evaluation of polymerase chain reaction (PCR) method and hybrid capture II (HCII) assay for the detection of human papillomavirus in cervical scrapings. Med J Malaysia 2007; 62:206-209. [PMID: 18246908] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
In order to investigate the reliability of detecting HPV DNA in cervical smears, we compared the performance of nested MY/GP PCR and FDA approved-Hybrid Capture II (HCII) using clinical cervical scrapings from 40 patients. It was found that PCR was more sensitive (81.8%) in comparison to HCII (36.4%) in detecting HPV although specificity of HCII was much higher (96.6%) than PCR (58.6%). The Negative Predictive Value (NPV) of both the techniques were quite similar but Positive Predictive Value (PPV) of HCII was much higher (80.0%) compared to PCR (42.9%). While the HCII method showed good specificity for HPV detection, its lack of sensitivity as compared to PCR may be a drawback for diagnostic use.
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Affiliation(s)
- R Saini
- School of Dental Sciences, Universiti Sains Malaysia, 16150 Kubang Kerian, Kelantan
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Looi LM, Zubaidah Z, Cheah PL, Cheong SK, Gudum HR, Iekhsan O, Ikram SI, Jamal R, Mak JW, Othman NH, Puteri JN, Rosline H, Sabariah AR, Seow HF, Sharifah NA. Research on cancer diagnosis in Malaysia: current status. Malays J Pathol 2005; 26:13-27. [PMID: 16190103] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 09/28/2022]
Abstract
Cancer is a major morbidity and mortality concern in Malaysia. Based on National Cancer Registry data, the Malaysian population is estimated to bear a cancer burden of about 40,000 new cases per year, and a cumulative lifetime risk of about 1:4. Cancer research in Malaysia has to consider needs relevant to our population, and resources constraints. Hence, funding bodies prioritise cancers of high prevalence, unique to our community and posing specific clinical problems. Cancer diagnosis is crucial to cancer management. While cancer diagnosis research largely aims at improvements in diagnostic information towards more appropriate therapy, it also impacts upon policy development and other areas of cancer management. The scope of cancer diagnosis upon which this paper is based, and their possible impact on other R&D areas, has been broadly categorized into: (1) identification of aetiological agents and their linkages to the development of precancer and cancer (impact on policy development, cancer prevention and treatment), (2) cancer biology and pathogenesis (impact on cancer prevention, treatment strategies and product development), (3) improvements in accuracy, sensitivity and specificity in cancer detection, monitoring and classification (impact on technology development) and (4) prognostic and predictive parameters (impact on treatment strategies). This paper is based on data collected by the Working Group on Cancer Diagnosis Research for the First National Conference on Cancer Research Coordination in April 2004. Data was collated from the databases of Institutions/Universities where the authors are employed, the Ministry of Science, Technology and Innovation (MOSTI) and targeted survey feedback from key cancer researchers. Under the 7th Malaysia Plan, 76 cancer projects were funded through the Intensified Research in Priority Areas (IRPA) scheme of MOSTI, amounting to almost RM15 million of grant money. 47(61.8%) of these projects were substantially in cancer diagnosis, accounting for 65.6% (RM 9.7 million) of cancer project funds. The 8th Malaysia Plan saw a change in research strategy. The IRPA agency fielded several top-down projects which encouraged a multicentre and multidisciplinary approach. This resulted in larger funding per project i.e. RM32 million for 49 projects. There was also a surge of interest in drug development and natural products. Because of this shift in direction, cancer diagnosis projects constituted only 51% of IRPA-funded cancer projects. Nonetheless funding for cancer diagnosis research has exceeded that of the 7th Malaysia Plan, being RM12.5 million by March 2004. The majority of such research is carried out at the Universities, engaging a large number of young scientists and postgraduate students (51 MSc and 21 PhD). A lot of research findings presented at scientific meetings have not yet been published and there is a glaring shortage of patents and commercialization of research findings (such as creation of test kits). Because diagnosis is very much a part of clinical practice, many researchers felt satisfied and confident that their work will be translated into practice and will significantly improve diagnostic services in Malaysia. National guidelines and consensus development on at least three malignancies i.e. breast cancer, oral cancer and lymphoma, have substantial basis in local R&D work. Problems encountered in research included (1) insufficient funding to realize research objectives, (2) lack of local expertise (most research assistants are inexperienced BSc graduates with no or minimal research experience), (3) inadequate technical support from vendors during equipment failure, (4) inexperienced Institutional development units to assist in product development, (5) lack of venture capital for commercialization of findings, and (6) inadequate incentives to undertake research. Researchers pointed out that plans to promote research should include the establishment of (1) regional and national cancer tissue banks, (2) a National Cancer Research Institute, (3) a dedicated cancer research fund, (4) a registry of cancer researchers, (5) national research coordinators, (6) improved coverage by the National Cancer Registry, (7) more international collaboration, (8) a better career structure for researchers, (9) improved Institutional support for product realization, and (10) better recognition for cancer researchers.
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Affiliation(s)
- L M Looi
- Department of Pathology, Faculty of Medicine, University of Malaya, 50603 Kuala Lumpur, Malaysia
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Omar E, Othman NH. Immunohistochemical localization of RET rearrangements in a Malaysian papillary thyroid carcinoma population. Med J Malaysia 2003; 58:461-2. [PMID: 14750392] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/28/2023]
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Ashraf M, Abdullah J, Ariff AR, Biswal BM, Mokhtar I, Othman NH. Unilateral exophthalmos caused by an extramedullary plasmacytoma: a case report. Malays J Med Sci 2003; 10:95-9. [PMID: 23365508 PMCID: PMC3557117] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2001] [Revised: 12/05/2002] [Accepted: 12/14/2002] [Indexed: 06/01/2023] Open
Abstract
Solitary plasmacytoma of the head and neck is a rare disease entity. Its description in the literature consist of some case reports. Solitary plasmacytoma presenting with exophthalmos are rare. We report a case of intracranial solitary plasmacytoma in an elderly lady with involvement of the right orbitocranial region presenting with severe exophthalmos. The tumour was debulked and radiotherapy was given.
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Affiliation(s)
- M. Ashraf
- Neuroscience Unit, Radiotherapy and Oncology
| | - J. Abdullah
- Neuroscience Unit, Radiotherapy and Oncology
| | - AR Ariff
- Neuroscience Unit, Radiotherapy and Oncology
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Biswal BM, Sain AHM, Othman NH, Baba A. Adjuvant treatment in colorectal cancer. Experience from a referral center in eastern peninsular Malaysia. Trop Gastroenterol 2002; 23:134-7. [PMID: 12693156] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 03/01/2023]
Abstract
BACKGROUND Colorectal cancer is one of the most common malignancies in the West, but in Asia the incidence is low. However in Malaysia, colorectal cancer is increasing with a reported figure of 15% of all cancer cases. Adjuvant chemo and radiotherapy are now more frequently used in such patients. The present retrospective analysis was performed to document the effect of such therapy among patients with colorectal cancer in Malaysia. MATERIALS AND METHODS This is a retrospective study on the use of adjuvant treatment in colorectal cancers. Patients with histopathological evidence of risk factors were subjected to adjuvant radiotherapy and/or chemotherapy. Cancers confined to rectum and rectosigmoid were subjected to pelvic radiotherapy to a tumor dose of 45 Gy in 20 fractions over 4-week period. 5-flurouracil based chemotherapy was predominantly offered for colonic cancers. RESULTS One hundred thirty patients with colorectal cancers received adjuvant treatment with a median age of 58 years (range 22-76 years). The male to female ratio was 1.4:1. There were 76% Malays, 19% Chinese, 2% Indians and 3% Siamese subjects in this study. Modified Dukes' stage B2 (28%) and C (38%) constituted the majority, which were distributed in rectum (40%), rectosigmoid (19%), and in the remaining colon (41%). Thirty-one patients received 5-fluorouracil with folinic acid based regime and 35 patients received 5-fluorouracil with levamisole based regimen. Locoregional radiotherapy was offered to 56 (43%) patients. Following treatment, the 2-year actuarial survival was 28% and 54% in colon and rectum cancer respectively. CONCLUSIONS This study showed that colorectal cancer is not infrequent among Malays in this region and rectal cancers had better survival than the colonic cancers.
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Affiliation(s)
- B M Biswal
- School of Medical Sciences, Universiti Sains Malaysia, 16150, Kubang Kerian, Kelantan, Malaysia.
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Othman NH, Ezzat S, Kovacs K, Horvath E, Poulin E, Smyth HS, Asa SL. Growth hormone-releasing hormone (GHRH) and GHRH receptor (GHRH-R) isoform expression in ectopic acromegaly. Clin Endocrinol (Oxf) 2001; 55:135-40. [PMID: 11453963 DOI: 10.1046/j.1365-2265.2001.01268.x] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Bronchial endocrine neoplasms causing acromegaly due to ectopic production of growth hormone (GH)-releasing hormone (GHRH) have been reported. We describe the case of a 39-year-old man with clinical and biochemical acromegaly. Magnetic resonance imaging revealed an enlarged pituitary, which was confirmed histologically to harbour somatotroph hyperplasia. Further investigations identified a circumscribed central mass in the right lung which was surgically resected and histologically confirmed to be an endocrine tumour with strong immunopositivity for GHRH, synaptophysin and chromogranin; the lesion also exhibited mild positivity for peptide YY, calcitonin gene-related peptide (CGRP), glucagon-like peptide (GLP)-1, corticotrophin-releasing hormone (CRH), tyrosine hydroxylase, vasoactive intestinal peptide (VIP) and enkephalin. S100 protein was identified in stellate cells surrounding nests of epithelial tumour cells. The MIB-1 antibody labelled about 10% of the tumour cells. We established that the tumour not only produced GHRH but the GHRH-receptor (GHRH-R) as well. GHRH and GHRH-R mRNA were identified and the latter was characterized as two variants, a full-length transcript and a truncated splice variant that has been described in human pituitary somatotroph adenomas. We suggest that GHRH expression by this tumour and the presence of its receptor may be responsible for enhanced growth. The expression of a truncated splice variant that is unable to transduce GHRH signalling may be implicated in the less aggressive behaviour of well-differentiated endocrine tumours that produce GHRH compared with small-cell lung carcinomas that are very responsive to GHRH growth stimulation.
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Affiliation(s)
- N H Othman
- Department of Pathology and Laboratory Medicine, Mount Sinai Hospital, 600 University Avenue, Toronto, Ontario, Canada
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Madhavan M, Othman NH, Singh MS, Indudharan R, Sharma HS, Shamsuddin AR. Kimura's disease: a report of three cases with a brief review of literature. Acta Otorhinolaryngol Ital 2000; 20:284-9. [PMID: 11234448] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
Abstract
Kimura's disease (KD) is an uncommon chronic inflammatory condition of unknown aetiology involving subcutaneous tissue, presenting as a tumor like lesion with a predilection for the head and neck region. Clinically it is often confused with parotid tumor with lymph node metastasis. It is difficult to diagnose before tissue biopsy. Fine needle aspiration cytology has only limited value. Unless the pathologists are aware of this entity, it might be misdiagnosed. Surgery, radiotherapy and steroid therapy have been tried but none is proved best and recurrence is common. Three cases of KD seen in our hospital and the problems encountered in them are presented.
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Affiliation(s)
- M Madhavan
- Department of pathology, School of Medical Sciences, Universiti Sains Malaysia.
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Abstract
Nonchromaffin paragangliomas are unusual tumours arising from widely distributed paraganglionic tissues probably of neural crest origin. In the head and neck region they are usually seen as carotid body or jugulotympanic tumours. Other rarely reported sites in the head and neck region are the orbit, nose and larynx. This report deals with a case of sinonasal paraganglioma which was initially treated with surgery and radiotherapy. Twenty two years later the tumour recurred and showed a rapid growth due to malignant transformation which we believe is late effect of radiotherapy. The clinical features, histopathology and role of radiotherapy in sinonasal paragangliomas together with a review of the medical literature have been discussed.
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Affiliation(s)
- H S Sharma
- Department of Otorhinolaryngology, School of Medical Sciences, Universiti Sains Malaysia, Kelantan.
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Abstract
Sinonasal teratocarcinosarcoma is very unusual malignant neoplasm histologically consisting of an epithelial element and one or more mesenchymal components. This is a report of teratocarcinosarcoma, in a 74-year-old male, involving the right nasal cavity and ethmoids with intracranial extension. The tumour was totally resected via the craniofacial approach and the patient was given post-operative chemotherapy. Extensive tumour necrosis, rapid growth and local destruction are the prominent features of this tumour. The clinical presentation, pathological features and clinical course of this rare malignancy are discussed with a review of the literature.
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Affiliation(s)
- H S Sharma
- Department of Otorhinolaryngology, School of Medical Sciences, Universiti Sains Malaysia, Kelantan, Malaysia
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Othman NH, Othman MS, Ismail AN, Mohammad NZ, Ismail Z. Multiple polypoid endometriosis--a rare complication following withdrawal of gonadotrophin releasing hormone (GnRH) agonist for severe endometriosis: a case report. Aust N Z J Obstet Gynaecol 1996; 36:216-8. [PMID: 8798320 DOI: 10.1111/j.1479-828x.1996.tb03291.x] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
A 30-year old female who initially had typical endometriosis treated according to a standard regimen later developed numerous highly vascular endometrial polyps on the vagina, cervix, ureter, serosal surfaces of the uterus, pouch of Douglas (POD) and other areas of pelvic peritoneum as well as the endometrium 8 months after withdrawal of treatment with Zoladex gonadotrophin releasing hormone (GnRH) agonist used for treatment of this disease. We postulate that these polyps developed as a rebound phenomenon upon withdrawal of Zoladex. We believe this is the first report of this complication following use of GnRH analogue.
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Affiliation(s)
- N H Othman
- Department of Pathology, Universiti Sains Malaysia, Malaysia
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Abstract
A case of endometrial infection by Entamoeba histolytica is described in an elderly lady who presented with profuse vaginal discharge and was clinically misdiagnosed as endometrial carcinoma.
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Affiliation(s)
- N H Othman
- Department of Pathology, School of Medical Sciences, Universiti Sains Malaysia, Kubang Kerian, Kelantan
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Othman NH, Rahman SA. Cerebrotendinous xanthomatosis with cholestanolaemia--involvement of five individuals in a Malay family. Med J Malaysia 1990; 45:275-80. [PMID: 2152046] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Cerebrotendinous xanthomatosis (CTX), a rare inherited lipid storage disease is due to a defect in bile acid metabolism. Involvement of five members of a family is presented. The clinical features, laboratory and pathologic findings are discussed. Tendinous and tuberous xanthomatosis, bilateral cataracts, cerebral impairment and raised serum cholestanol are the salient features. We believe this is the first report of CTX in Malaysia.
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Affiliation(s)
- N H Othman
- Department of Pathology, School of Medical Sciences, Universiti Sains Malaysia, Kubang Kerian, Kelantan
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