Mohd Faidz Mohamad Shahimin
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Preferred name
Mohd Faidz Mohamad Shahimin
Official Name
Mohd Faidz , Mohamad Shahimin
Alternative Name
Mohamad Shahimin, Mohd Faidz
Mohamad Shahimin, M. F.
Shahimin, M. F.
Main Affiliation
Scopus Author ID
57006554500
Researcher ID
B-9547-2018

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Biodegradation of 2-methylpentane in fluid fine tailings amended with a mixture of iso-alkanes under sulfate-reducing conditions

2023-09-01 , Mohd Faidz Mohamad Shahimin , Siddique T.

Anaerobic microorganisms in Canada Natural Upgrading Limited (CNUL) fluid fine tailings (FFT) are sustained by residual solvent hydrocarbons. Although FFT are methanogenic in nature, sulfate-reducing microorganisms represent a significant portion of FFT bacterial community. In this study, we examined biodegradation of three iso-alkanes (2-methylbutane, 2-methylpentane, and 3-methylpentane), representing major iso-alkanes in paraffinic solvent, in CNUL FFT under sulfate-reducing conditions. During ~1100 days of incubation, only 2-methylpentane was degraded partially, whereas 2-methylbutane and 3-methylpentane were not degraded. During active degradation of 2-methylpentane, the bacterial community was dominated by Anaerolineaceae followed by Syntrophaceae, Peptococcaceae, Desulfobacteraceae, and Desulfobulbaceae. The archaeal community was co-dominated by acetoclastic (Methanosaetaceae) and hydrogenotrophic (Methanobacteriaceae) methanogens. This study underlines the limited capability of the microbial community indigenous to CNUL FFT in degrading recalcitrant iso-alkanes under sulfate-reducing conditions.

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Laboratory breeding and rearing of cellar spider, Crossopriza lyoni Blackwall

2022-12-01 , Johan Ariff Mohtar , Mohd Faidz Mohamad Shahimin

Spiders have emerged as one of the leading model organisms in many research fields due to their compelling biology. Often, scientific investigations involving the use of spiders face inevitable problems associated with the lack of specimens from laboratory stock, resulting in difficulties in yielding reproducible investigations for predictive research. Thus, several species of well-studied spiders, including Parasteatoda tepidariorum, have been successfully bred for such purposes. Crossopriza lyoni is a Haplogyne spider, globally distributed and widespread in human inhabitants, prompting interest in various studies over the last decades. Despite its scientific importance, no laboratory-bred C. lyoni has been documented. Therefore, we describe a successful captive breeding system of the species under controlled conditions to establish a laboratory stock culture. Methods for mating induction, egg collection and segregation, artificial embryo incubation, and colony husbandry are discussed. The technique presented is a simple and low-cost approach that is reliable for C. lyoni propagation in the laboratory over several generations. Graphical abstract: [Figure not available: see fulltext.]

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Fringe projection phase shift variance effects on breast height imaging

2020-01-08 , Norhaimi W.M.W. , Zaliman Sauli , Aris H. , Retnasamy V. , Mohd Faidz Mohamad Shahimin , Vairavan R.

Fringe projection has been garnering tremendous interest in the field of optical imaging. A wide range of surface measurement application including the medical application utilizes the fringe projection as means of surface metrology due to its non-invasive imaging modality. Although fringe projection has been applied in the medical field, minimal work has been conducted in the field of breast height imaging. In this work, a digital fringe projection system based on the phase shifting fringe projection is applied on a prosthetic tear drop breast. The fringe projection system consists of a digital projector, CCD camera and a computer. A phase shift variance of π/4, π/2 and 2π/3 from the fringe patterns are projected onto the breast sample using the three step phase shift fringe projection. The phase shift is varied to determine a suitable phase shift for the tear drop breast height imaging obtained from the phase map followed by the phase unwrapping process. The surface height profile obtained from the varied phase shift of the fringe projection system was compared to the height profile of the tear drop breast obtained from a direct method using the electronic digital vernier caliper. The results demonstrate that the fringe patterns phase shifted by 2π/3 produce a smooth phase map and unwrapped phase map which resulted in a clear and visible height profile of the tear drop breast with an almost identical height profile with the direct measurement method. The preliminary results from this study can be further extended to breast imaging with the presence of cancerous breast tumors.

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FPGA based Quantum Key Distribution Electronic System for Multipurpose Optical Setup and Protocols

2021-03-01 , Aseri N.S.M. , Ali N. , Yusof N.R. , Endut R. , Nor Azura Malini Ahmad Hambali , Mohd Faidz Mohamad Shahimin , Mohd Rashidi Che Beson , Syed Alwee Aljunid Syed Junid

The purpose of the FPGA electronic control system for Quantum Key Distribution (QKD) is to improve the analog electronic system in optoelectronic conversion. In the existence of the Mezzanine FPGA board, the main conversion of optical laser signal and optical detector signal can be improved. Mezzanine board can reduce the noise errors during the transmission and receiving a signal. Commonly, the optical signal needs to interface with an analog electronic system. This process requires the conversion process and interfacing with a digital signal to control the optical device and produce a good quality optical signal. The Mezzanine board can reduce the uncertainty during signal conversion and gives the digital capability to control the optical devices. The optical modulation signal for phase modulator control can achieve a full complete phase shift in the Mezzanine board. Plus, the voltage phase has capability up to 10 V with an accuracy of 2.4 µV. The time conversion for phase modulator can be extended in the Mezzanine board based on the digital control signal from FPGA. The system is capable to extend into multiple timing control to handle all the signal and to synchronize the signal in receiving, transmission or in between of the transmission. Thus, the system can handle one way or two-way QKD system accordingly.

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Potential of oil palm trunk starch as flocculant for contaminant of emerging compound removal

2021-09-06 , Mohd Amin M.F. , Mat Rasat M.S. , Ahmad M.I. , Aftar Ali N.S. , Muda K. , Zaidi N.S. , Ismail S. , Mohd Faidz Mohamad Shahimin , Mohd Amin M.A. , Salam M.A.

In this preliminary study, a natural flocculant is developed from an oil palm trunk. The flocculant further tested for its ability in turbidity and COD removal with additional of atrazine in wastewater and demineralised water matrix. At the optimum dosage of 20mg/L, the developed cationic OPT starch able to remove around 95% turbidity and 85% COD. In addition, the cationic OPT starch also show the ability to remove spiked atrazine from both water matrixes to the maximum range of 55-85%. In conclusion, the developed oil-palm based flocculant show great potential for real-world application with added cost-effective benefits.

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A mini review and bibliometric analysis of palm oil mill effluent in past five years

2023-01-01 , Mohd Pauzi F. , Muda K. , Basri H.F. , Omoregie A.I. , Hong C.Y. , Aftar Ali N.S. , Mohamed Najib M.Z. , Mohd Amin M.F. , Ismail S. , Mohd Faidz Mohamad Shahimin , Farrah Aini Dahalan

Indonesia and Malaysia are countries with the highest palm oil production globally. Indonesia is leading the list, followed by Malaysia and Thailand. Palm oil production generates countless benefits to the economy, environment, and society of the contributed countries. This industry provides high income and collection of methane gas for biogas generation and economy of the local community. However, despite the benefits, this industry has some difficulties, including treating the Palm Oil Mill Effluent (POME). POME contains a complex microbial structure and a high amount of oil, grease, and suspended solids. The existing treatment of POME consists of many drawbacks that lead to poor quality of the effluent and failure to meet the minimum requirement from the Department of Environment (DOE). Advance Oxidization Process (AOP), bio granulation, and ponding system are among the research that have been tried to treat POME. The local government still uses old-style treatment types such as Conventional Activated Sludge (CAS), ponding system, and anaerobic digester tank. This review paper presents a mini review of positive and negative consequences the palm oil industry as well as examine a bibliometric study towards the modern research development of the POME. This mini review concludes that the palm oil industry encourages the positive impact in economy, environment and social to the many parties especially country and local community. Besides that, the existing treatment of the POME have to be improved appropriate with the increment of the demand and era.

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Current status of renewable energy development

2022-01-01 , Ahmad Anas Nagoor Gunny , Mohd Faidz Mohamad Shahimin , Alina Rahayu Mohamed , Jalil M.F.A.

Malaysia is blessed with rich natural resources that can be potential sources for the generation of sustainable clean energy. Natural resources such as hydro, solar, lignocellulosic biomass can be harnessed for the generation of renewable energy. In the effort to mitigate global climate change, Malaysia has strengthened its commitment to increase carbon–neutral energy sources and recently has upgraded its target of renewable energy in the country’s energy mix from 20 to 31% by 2025. With Malaysia’s unique geographical and socio-economic advantages, a variety of renewable energy technologies can be developed in Malaysia. To propel Malaysia’s renewable energy agenda, aggressive actions were taken, via the establishment of various policies and enactments of several acts, to strengthen and boost the implementation of renewable energy in governmental agencies and private sectors and from individuals to corporates. Several initiatives and incentives were also launched, namely the Small Renewable Energy Power (SREP) Programme, Feed-in Tariff (FiT), and Net Energy Metering (NEM) schemes, by the government to achieve the target of renewable energy percentage in the total energy mix. Renewable energies, such as hydro and solar, have taken a tremendous leap in technological development and implementation in Malaysia, however, biomass-based renewable energy is still in its infancy stage. Being a country with high agricultural activities and products, biomass-based renewable energy has high potential in Malaysia. In this chapter, we will be giving an overview of Malaysia’s renewable energy resources, the launched policies and schemes in promoting the development of renewable energies, and the potential of palm oil plantation and oil palm industries in advancing biomass-based renewable energy technologies.

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Uncovering Anaerobic Hydrocarbon Biodegradation Pathways in Oil Sands Tailings from Two Different Tailings Ponds via Metabolite and Functional Gene Analyses

2024-01-01 , Mohd Faidz Mohamad Shahimin , Tariq Siddique

Oil sands tailings, a slurry of alkaline water, silt, clay, unrecovered bitumen, and residual hydrocarbons generated during bitumen extraction, are contained in ponds. Indigenous microbes metabolize hydrocarbons and emit greenhouse gases from the tailings. Metabolism of hydrocarbons in tailings ponds of two operators, namely, Canadian Natural Upgrading Limited (CNUL) and Canadian Natural Resources Limited (CNRL), has not been comprehensively investigated. Previous reports have revealed sequential and preferential hydrocarbon degradation of alkanes in primary cultures established from CNUL and CNRL tailings amended separately with mixtures of hydrocarbons (n-alkanes, iso-alkanes, paraffinic solvent, or naphtha). In this study, activation pathway of hydrocarbon biodegradation in these primary cultures was investigated. The functional gene analysis revealed that fumarate addition was potentially the primary activation pathway of alkanes in all cultures. However, the metabolite analysis only detected transient succinylated 2-methylpentane and 2-methylbutane metabolites during initial methanogenic biodegradation of iso-alkanes and paraffinic solvent in all CNUL and CNRL cultures amended with iso-alkanes and paraffinic solvent. Under sulfidogenic conditions (prepared only with CNUL tailings amended with iso-alkanes), succinylated 2-methylpentane persisted throughout incubation period of ~ 1100 days, implying dead-end nature of the metabolite. Though no metabolite was detected in n-alkanes- and naphtha-amended cultures during incubation, assA/masD genes related to Peptococcaceae were amplified in all CNUL and CNRL primary cultures. The findings of this present study suggest that microbial communities in different tailings ponds can biodegrade hydrocarbons through fumarate addition as activation pathway under methanogenic and sulfidogenic conditions.

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Ultraviolet-visible absorbance analysis on solvent dependent effect of tropical plant anthocyanin extraction for dye-sensitized solar cells

2020-01-08 , Suhaimi S. , Nasri N.M. , Wahab S. , Ismail N.S. , Mohd Faidz Mohamad Shahimin , Zaliman Sauli

In the current investigation, natural tropical dyes extracted from Mulberry, Roselle and Oxalis Triangularis were used as natural dye sensitiser. Four different extraction solvents, namely acetone, ethanol, a mixture of acetone and ethanol (v/v 1:2) and distilled water were employed to extract natural anthocyanin dyes from Mulberry, Roselle and Oxalis Triangularis. The natural dye extraction process was analysed using ultraviolet-visible spectroscopy, and the spectrum was taken in the wavelength range of 400 nm to 800 nm. The main photoactive component of Mulberry, Roselle and Oxalis Triangularis are anthocyanins compound which considered as an unstable pigment that undergo gradual degradation processes throughout storage or use. The spectra can be seen, that there are differences in its intensity where ethanol and acetone solvent was much higher absorbance peak vis-à-vis the other solvents. Mulberry and Roselle extraction in ethanol shows the high absorbance intensity at wavelength 550 nm, while Oxalis Triangularis extraction in acetone shows the higher absorbance at the peak of 664 nm. This indicates the presence of more anthocyanins compound that absorbs a higher number of photon energy light source. It is also appears that the dye extraction performance gradually degrade after seven days storage in dark condition. Mulberry and Oxalis Triangularis extraction in mixture of acetone and ethanol exhibit low degradation percentage about, 0% and 32%, respectively, while Roselle extraction in DI water reveal 0% degradation after 7 days.

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Ultrasound-assisted extraction of starch from oil palm trunk: an optimization by response surface methodology

2023-03 , Nur Shahidah Aftar Ali , Khalida Muda , Mohamed Zuhaili Mohamed Najib , Mohamad Faiz Mohd Amin , Shahrul Ismail , Mohd Faidz Mohamad Shahimin , Farrah Aini Dahalan

Higher production of palm oil in Malaysia has resulted in a significant amount of oil palm biomass including oil palm trunk (OPT). OPT has been studied as an alternative starch source. To date, reports on the extraction of starch from OPT using ultrasound-assisted extraction (UAE) are limited. The application of UAE is considered to be a simpler and effective way in starch extraction compared to conventional extraction methods. This study aims to investigate the potential of ultrasound-assisted extraction to extract starch from OPT, and optimization using response surface methodology. A three-factor central composite design (CCD) was designed to determine the effects of variables on response. The three variables involved in the study, namely: sonication temperature (45-65°C), sonication time (30-60 min) and sodium metabisulfite concentration (0.5-1.5% w/v). All of the data were analysed using Analysis of Variance (ANOVA). The R2 value (95.6%) and model (p <0.0001), indicating the acceptability of the model and significance in the interaction between independent variables. At the optimum conditions of 52.84°C temperature, 30.66 min exposure time and 0.58% w/v sodium metabisulfite concentration, the starch yield achieved its optimum value by 34.21%. Therefore, this study proved the potential of UAE in extracting higher OPT starch.

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