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  1. Article ; Online: Investigating the crude oil biodegradation performance in bioreactor by using a consortium of symbiotic bacteria

    Chuah, Lai Fatt / Nawaz, Alam / Dailin, Daniel Joe / Oloruntobi, Olakunle / Habila, Mohamed A. / Tong, Woei Yenn / Misson, Mailin

    Chemosphere. 2023 Oct., v. 337 p.139293-

    2023  

    Abstract: Crude oil pollution is one of the most serious environmental issues today, and the clean-up procedure is perhaps the most difficult. Within one to three weeks, the vast majority of oil bacteria may degrade approximately 60% of the crude oil, leaving ... ...

    Abstract Crude oil pollution is one of the most serious environmental issues today, and the clean-up procedure is perhaps the most difficult. Within one to three weeks, the vast majority of oil bacteria may degrade approximately 60% of the crude oil, leaving approximately 40% intact. The by-product metabolites produced during the breakdown of oil are essentially organic molecules in nature. These metabolites inhibit its enzymes, preventing the oil bacteria from further degrading the oil. By combining a variety of different oils with heterotrophic bacteria in a bioreactor, the rate of crude oil biodegradation was accelerated. In this study, two strains of oil-resistant, heterotrophic bacteria (OG1 and OG2-Erythrobacter citreus) and a bacterium that uses hydrocarbons (AR3-Pseudomonas pseudoalcaligenes) were used. Gas chromatography-mass spectroscopy was used to investigate the effectiveness of this consortium of symbiotic bacteria in the biodegradation of crude oil. According to gravimetric and gas chromatography analyses, the consortium bacteria digested 69.6% of the crude oil in the bioreactor, while the AR3 single strain was only able to destroy 61.9% of it. Under the same experimental conditions, consortium bacteria degraded approximately 84550.851 ppb (96.3%) of 16 aliphatic hydrocarbons and 9333.178 ppb (70.5%) of 16 aromatic hydrocarbons in the bioreactor. It may be inferred that the novel consortium of symbiotic bacteria accelerated the biodegradation process and had great potential for use in increasing the bioremediation of hydrocarbon-contaminated locations.
    Keywords bacteria ; biodegradation ; bioreactors ; bioremediation ; byproducts ; gas chromatography ; metabolites ; oils ; petroleum ; pollution ; spectroscopy ; Oil bacteria ; Crude oil ; Bioreactor
    Language English
    Dates of publication 2023-10
    Publishing place Elsevier Ltd
    Document type Article ; Online
    ZDB-ID 120089-6
    ISSN 1879-1298 ; 0045-6535 ; 0366-7111
    ISSN (online) 1879-1298
    ISSN 0045-6535 ; 0366-7111
    DOI 10.1016/j.chemosphere.2023.139293
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  2. Article: Biodegradation of crude oil in seawater by using a consortium of symbiotic bacteria

    Chuah, Lai Fatt / Chew, Kit Wayne / Bokhari, Awais / Mubashir, Muhammad / Show, Pau Loke

    Environmental research. 2022 Oct., v. 213

    2022  

    Abstract: This work presents the enhancement of oil biodegradation in seawater using a mixture of oil and microorganisms. Retardation of crude oil biodegradation in seawater is hypothetically due to the inhibiting of metabolites produced by the oil bacterium which ...

    Abstract This work presents the enhancement of oil biodegradation in seawater using a mixture of oil and microorganisms. Retardation of crude oil biodegradation in seawater is hypothetically due to the inhibiting of metabolites produced by the oil bacterium which inhibit its enzymes. For this purpose, the bacteria consortium consisting of an active oil-oxidizing bacterium (AR3-Pseudomonas pseudoalcaligenes) and two oil-resistant and active heterotrophic bacteria (OG1 and OG2-Erythrobacter citreus) were formed. The heterotrophic bacteria, OG1 and OG2 were able to remove metabolites produced during oil degradation. It was found that AR3 was retarded by metabolites, while OG1 and OG2 were able to grow in the metabolites. OG1 and OG2 were applied together to enhance growth and removal of the metabolites. About 59.9% of crude oil degradation was degraded by AR3 pure culture, while 68.6% was degraded by the bacteria consortium. About 31.4% of the crude oil was found to remain in seawater due to the presence of asphaltenes and resin hydrocarbons. The bacteria consortium was able to degrade 84.1% of total hydrocarbons while 67.0% was degraded by AR3. A total of 99.8% of the aliphatic content and 38.4% of the total aromatic hydrocarbons were degraded by the bacteria consortium, while a lower 79.4% of total aliphatic and 31.0% of total aromatic were degraded by AR3 under the same experimental conditions. The results which were obtained from this study support the hypothesis that the retardation of oil degradation by AR3 is due to the inhibition of metabolites on the growth.
    Keywords asphaltenes ; bacteria ; biodegradation ; metabolites ; oils ; petroleum ; research ; seawater
    Language English
    Dates of publication 2022-10
    Publishing place Elsevier Inc.
    Document type Article
    ZDB-ID 205699-9
    ISSN 1096-0953 ; 0013-9351
    ISSN (online) 1096-0953
    ISSN 0013-9351
    DOI 10.1016/j.envres.2022.113721
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  3. Article ; Online: Biodegradation of crude oil in seawater by using a consortium of symbiotic bacteria.

    Chuah, Lai Fatt / Chew, Kit Wayne / Bokhari, Awais / Mubashir, Muhammad / Show, Pau Loke

    Environmental research

    2022  Volume 213, Page(s) 113721

    Abstract: This work presents the enhancement of oil biodegradation in seawater using a mixture of oil and microorganisms. Retardation of crude oil biodegradation in seawater is hypothetically due to the inhibiting of metabolites produced by the oil bacterium which ...

    Abstract This work presents the enhancement of oil biodegradation in seawater using a mixture of oil and microorganisms. Retardation of crude oil biodegradation in seawater is hypothetically due to the inhibiting of metabolites produced by the oil bacterium which inhibit its enzymes. For this purpose, the bacteria consortium consisting of an active oil-oxidizing bacterium (AR3-Pseudomonas pseudoalcaligenes) and two oil-resistant and active heterotrophic bacteria (OG1 and OG2-Erythrobacter citreus) were formed. The heterotrophic bacteria, OG1 and OG2 were able to remove metabolites produced during oil degradation. It was found that AR3 was retarded by metabolites, while OG1 and OG2 were able to grow in the metabolites. OG1 and OG2 were applied together to enhance growth and removal of the metabolites. About 59.9% of crude oil degradation was degraded by AR3 pure culture, while 68.6% was degraded by the bacteria consortium. About 31.4% of the crude oil was found to remain in seawater due to the presence of asphaltenes and resin hydrocarbons. The bacteria consortium was able to degrade 84.1% of total hydrocarbons while 67.0% was degraded by AR3. A total of 99.8% of the aliphatic content and 38.4% of the total aromatic hydrocarbons were degraded by the bacteria consortium, while a lower 79.4% of total aliphatic and 31.0% of total aromatic were degraded by AR3 under the same experimental conditions. The results which were obtained from this study support the hypothesis that the retardation of oil degradation by AR3 is due to the inhibition of metabolites on the growth.
    MeSH term(s) Bacteria/metabolism ; Biodegradation, Environmental ; Hydrocarbons ; Petroleum ; Seawater
    Chemical Substances Hydrocarbons ; Petroleum
    Language English
    Publishing date 2022-06-20
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 205699-9
    ISSN 1096-0953 ; 0013-9351
    ISSN (online) 1096-0953
    ISSN 0013-9351
    DOI 10.1016/j.envres.2022.113721
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Investigating the crude oil biodegradation performance in bioreactor by using a consortium of symbiotic bacteria.

    Chuah, Lai Fatt / Nawaz, Alam / Dailin, Daniel Joe / Oloruntobi, Olakunle / Habila, Mohamed A / Tong, Woei Yenn / Misson, Mailin

    Chemosphere

    2023  Volume 337, Page(s) 139293

    Abstract: Crude oil pollution is one of the most serious environmental issues today, and the clean-up procedure is perhaps the most difficult. Within one to three weeks, the vast majority of oil bacteria may degrade approximately 60% of the crude oil, leaving ... ...

    Abstract Crude oil pollution is one of the most serious environmental issues today, and the clean-up procedure is perhaps the most difficult. Within one to three weeks, the vast majority of oil bacteria may degrade approximately 60% of the crude oil, leaving approximately 40% intact. The by-product metabolites produced during the breakdown of oil are essentially organic molecules in nature. These metabolites inhibit its enzymes, preventing the oil bacteria from further degrading the oil. By combining a variety of different oils with heterotrophic bacteria in a bioreactor, the rate of crude oil biodegradation was accelerated. In this study, two strains of oil-resistant, heterotrophic bacteria (OG1 and OG2-Erythrobacter citreus) and a bacterium that uses hydrocarbons (AR3-Pseudomonas pseudoalcaligenes) were used. Gas chromatography-mass spectroscopy was used to investigate the effectiveness of this consortium of symbiotic bacteria in the biodegradation of crude oil. According to gravimetric and gas chromatography analyses, the consortium bacteria digested 69.6% of the crude oil in the bioreactor, while the AR3 single strain was only able to destroy 61.9% of it. Under the same experimental conditions, consortium bacteria degraded approximately 84550.851 ppb (96.3%) of 16 aliphatic hydrocarbons and 9333.178 ppb (70.5%) of 16 aromatic hydrocarbons in the bioreactor. It may be inferred that the novel consortium of symbiotic bacteria accelerated the biodegradation process and had great potential for use in increasing the bioremediation of hydrocarbon-contaminated locations.
    MeSH term(s) Petroleum/metabolism ; Biodegradation, Environmental ; Hydrocarbons/metabolism ; Bacteria/metabolism ; Bioreactors
    Chemical Substances Petroleum ; Hydrocarbons
    Language English
    Publishing date 2023-06-25
    Publishing country England
    Document type Journal Article
    ZDB-ID 120089-6
    ISSN 1879-1298 ; 0045-6535 ; 0366-7111
    ISSN (online) 1879-1298
    ISSN 0045-6535 ; 0366-7111
    DOI 10.1016/j.chemosphere.2023.139293
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Unleashing the potential of xanthan: a comprehensive exploration of biosynthesis, production, and diverse applications.

    Rashidi, Ahmad Ramli / Azelee, Nur Izyan Wan / Zaidel, Dayang Norulfairuz Abang / Chuah, Lai Fatt / Bokhari, Awais / El Enshasy, Hesham Ali / Dailin, Daniel Joe

    Bioprocess and biosystems engineering

    2023  Volume 46, Issue 6, Page(s) 771–787

    Abstract: Employing aerobic fermentation, Gram-negative bacteria belonging to the genus Xanthomonas produce the high molecular weight natural heteropolysaccharide known as xanthan. It has various amounts of O-acetyl and pyruvyl residues together with D-glucosyl, D- ...

    Abstract Employing aerobic fermentation, Gram-negative bacteria belonging to the genus Xanthomonas produce the high molecular weight natural heteropolysaccharide known as xanthan. It has various amounts of O-acetyl and pyruvyl residues together with D-glucosyl, D-mannosyl, and D-glucuronyl acid residues in a molar ratio of 2:2:1. The unique structure of xanthan allowed its various applications in a wide range of industries such as the food industry, pharmacology, cosmetics and enhanced oil recovery primarily in petroleum. The cultivation medium used in the manufacture of this biopolymer is critical. Many attempts have been undertaken to generate xanthan gum from agro-based and food industry wastes since producing xanthan gum from synthetic media is expensive. Optimal composition and processing parameters must also be considered to achieve an economically viable manufacturing process. There have been several attempts to adjust the nutrient content and feeding method, temperature, pH, agitation and the use of antifoam in xanthan fermentations. Various modifications in technological approaches have been applied to enhance its physicochemical properties which showed significant improvement in the area studied. This review describes the biosynthesis production of xanthan with an emphasis on the importance of the upstream processes involving medium, processing parameters, and other factors that significantly contributed to the final application of this precious polysaccharide.
    MeSH term(s) Xanthomonas campestris/metabolism ; Polysaccharides, Bacterial ; Xanthomonas ; Fermentation
    Chemical Substances xanthan gum (TTV12P4NEE) ; Polysaccharides, Bacterial
    Language English
    Publishing date 2023-04-08
    Publishing country Germany
    Document type Journal Article ; Review
    ZDB-ID 1476357-6
    ISSN 1615-7605 ; 1432-0797 ; 1615-7591
    ISSN (online) 1615-7605 ; 1432-0797
    ISSN 1615-7591
    DOI 10.1007/s00449-023-02870-9
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  6. Article ; Online: Decarbonising ASEAN coastal shipping: Addressing climate change and coastal ecosystem issues through sustainable carbon neutrality strategies.

    Oloruntobi, Olakunle / Chuah, Lai Fatt / Mokhtar, Kasypi / Gohari, Adel / Rady, Ahmed / Abo-Eleneen, Rasha E / Akhtar, Muhammad Saeed / Mubashir, Muhammad

    Environmental research

    2023  Volume 240, Issue Pt 2, Page(s) 117353

    Abstract: This study analyzes the impact of ASEAN's goal of achieving carbon neutrality by 2050 on climate change and coastal ecosystems by examining carbon emissions and energy usage from 2019 to 2050 using different scenarios to reduce emissions and meet global ... ...

    Abstract This study analyzes the impact of ASEAN's goal of achieving carbon neutrality by 2050 on climate change and coastal ecosystems by examining carbon emissions and energy usage from 2019 to 2050 using different scenarios to reduce emissions and meet global temperature goals. This research proposes strategies to reduce carbon emissions and mitigate climate change effects on coastal ecosystems, focusing on evaluating CO
    MeSH term(s) Climate Change ; Ecosystem ; Ships ; Carbon Dioxide ; Carbon ; Biodiversity ; Temperature
    Chemical Substances Carbon Dioxide (142M471B3J) ; Carbon (7440-44-0)
    Language English
    Publishing date 2023-10-27
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 205699-9
    ISSN 1096-0953 ; 0013-9351
    ISSN (online) 1096-0953
    ISSN 0013-9351
    DOI 10.1016/j.envres.2023.117353
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Assessing coastal bathymetry and climate change impacts on coastal ecosystems using Landsat 8 and Sentinel-2 satellite imagery.

    Mokhtar, Kasypi / Chuah, Lai Fatt / Abdullah, Mohd Azhafiz / Oloruntobi, Olakunle / Ruslan, Siti Marsila Mhd / Albasher, Gadah / Ali, Atif / Akhtar, Muhammad Saeed

    Environmental research

    2023  Volume 239, Issue Pt 2, Page(s) 117314

    Abstract: Coastal ecosystems are facing heightened risks due to human-induced climate change, including rising water levels and intensified storm events. Accurate bathymetry data is crucial for assessing the impacts of these threats. Traditional data collection ... ...

    Abstract Coastal ecosystems are facing heightened risks due to human-induced climate change, including rising water levels and intensified storm events. Accurate bathymetry data is crucial for assessing the impacts of these threats. Traditional data collection methods can be cost-prohibitive. This study investigates the feasibility of using freely accessible Landsat and Sentinel satellite imagery to estimate bathymetry and its correlation with hydrographic chart soundings in Port Klang, Malaysia. Through analysis of the blue and green spectral bands from the Landsat 8 and Sentinel 2 datasets, a bathymetry map of Port Klang's seabed is generated. The precision of this derived bathymetry is evaluated using statistical metrics like Root Mean Square Error (RMSE) and the coefficient of determination. The results reveal a strong statistical connection (R
    MeSH term(s) Humans ; Ecosystem ; Satellite Imagery ; Climate Change ; Conservation of Natural Resources ; Water
    Chemical Substances Water (059QF0KO0R)
    Language English
    Publishing date 2023-10-05
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 205699-9
    ISSN 1096-0953 ; 0013-9351
    ISSN (online) 1096-0953
    ISSN 0013-9351
    DOI 10.1016/j.envres.2023.117314
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  8. Article: Numerical simulation of liquid jet atomization in subsonic crossflow

    Chang, Jianlong / He, Liujing / Chen, Lianhua / Shen, Zhangfeng / Chuah, Lai Fatt / Bokhari, Awais / Klemeš, Jiří Jaromír / Han, Ning

    Energy. 2022 Oct. 15, v. 257

    2022  

    Abstract: To explore the influence of different factors on the atomization pattern and characteristics of the crossflow, the influence of three dimensionless parameters is investigated in this paper, namely Weber number, Oh, and the momentum flux ratio q, on the ... ...

    Abstract To explore the influence of different factors on the atomization pattern and characteristics of the crossflow, the influence of three dimensionless parameters is investigated in this paper, namely Weber number, Oh, and the momentum flux ratio q, on the atomization in subsonic crossflow. The investigations are based on the CLSVOF method and Large Eddy Simulation and developed in conjunction with adaptive mesh refinement techniques. In terms of atomization morphology, three-view drawing of the jet fragmentation morphology and cross-sectional deformation processes under different operating conditions are compared and investigated. In terms of atomization characteristics, the jet penetration depth and spraying distribution curves, as well as the fragmentation position and droplet velocity distribution are analyzed in detail. The results show that there is a pronounced effect for Weber number on the fragmentation pattern and atomization characteristics of liquid jet into a crossflow. As the Weber number increases, the column fragmentation dominated by RT instability gradually changes to surface fragmentation dominated by KH instability. The research also concluded that the momentum flux ratio q is a key element in the penetration depth, which is reflected in the fact that when q is larger, the jet bends less with a stronger penetration ability.
    Keywords atomization ; deformation ; droplets ; energy ; liquids ; momentum
    Language English
    Dates of publication 2022-1015
    Publishing place Elsevier Ltd
    Document type Article
    ZDB-ID 2019804-8
    ISSN 0360-5442 ; 0360-5442
    ISSN (online) 0360-5442
    ISSN 0360-5442
    DOI 10.1016/j.energy.2022.124676
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  9. Article ; Online: Strategic resources alignment for sustainability: The impact of innovation capability and intellectual capital on SME's performance. Moderating role of external environment

    Arshad, Muhammad Zulqarnain / Arshad, Darwina / Lamsali, Hendrik / Ibrahim Alshuaibi, Ahmad Said / Ibrahim Alshuaibi, Mohammad Said / Albashar, Gadah / Shakoor, Awais / Chuah, Lai Fatt

    Journal of Cleaner Production. 2023 Sept., v. 417 p.137884-

    2023  

    Abstract: Small and medium-sized enterprises (SMEs) are vital to the growth and development of a country. This study examined how innovation capability, intellectual capital and SME performance are related. Cross-sectional questionnaires were given to 379 ... ...

    Abstract Small and medium-sized enterprises (SMEs) are vital to the growth and development of a country. This study examined how innovation capability, intellectual capital and SME performance are related. Cross-sectional questionnaires were given to 379 Pakistani textile SMEs. Only 318 surveys were considered reliable enough to proceed with the investigation. To test each hypothesis and assess the validity and reliability of the measurement model, this study used the PLS-SEM (Smart-PLS 4.0) technique. The findings indicate that the performance of SMEs is significantly impacted by their innovation capability and intellectual capital. Based on the results of this study, it can be concluded that the innovation capability and intellectual capital of an organization are significantly impacted by the external environment. The analysis indicates that intangible resources, specifically innovation capability and intellectual capital, are crucial determinants of sustainable growth and are considered internal capabilities of the firm. This study provides valuable insights and knowledge for both governmental entities and SMEs. In order to boost Pakistani SMEs' performance and build a sustainable economy, these insights can be incorporated into government programs and guidelines. This study contributed to the body of knowledge by assessing internal capacities (innovation capability and intellectual capital) in the setting of SMEs with the moderating influence of the external environment, as the majority of studies on these variables focused on large enterprises.
    Keywords fabrics ; growth and development ; human capital ; models ; sustainable development ; Strategic resources ; Innovation capability ; Intellectual capital ; SME performance ; Sustainability
    Language English
    Dates of publication 2023-09
    Publishing place Elsevier Ltd
    Document type Article ; Online
    ISSN 0959-6526
    DOI 10.1016/j.jclepro.2023.137884
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  10. Article ; Online: Enhancing coastal ecosystem resilience: Investigating the interplay between safety criteria and ferry employee's perceptions to address climate change impacts

    Azmi, Muhammad Azizol / Mokhtar, Kasypi / Noor Apandi Osnin / Razali Chan, Suzanna / Albasher, Gadah / Ali, Atif / Nawaz, Alam / Oloruntobi, Olakunle / Chuah, Lai Fatt

    Environmental Research. 2023 Dec., v. 238 p.117074-

    2023  

    Abstract: Coastal ecosystems play an important part in mitigating the effects of climate change. Coastal ecosystems are becoming more susceptible to climate change impacts due to human activities and maritime accidents. The global shipping industry, especially in ... ...

    Abstract Coastal ecosystems play an important part in mitigating the effects of climate change. Coastal ecosystems are becoming more susceptible to climate change impacts due to human activities and maritime accidents. The global shipping industry, especially in Southeast Asia, has witnessed numerous accidents, particularly involving passenger ferries, resulting in injuries and fatalities in recent years. In order to mitigate the impact of climate change on coastal ecosystems, this study aimed to evaluate the relationship between employees’ perceptions of safety criteria and their own safety behaviour on Langkawi Island, Malaysia. A straightforward random sampling technique was employed to collect data from 112 ferry employees aboard Malaysian-registered passenger boats by administering questionnaires. The findings shed light on the strong connection between providing safety instructions for passengers and safety behaviour among ferry workers. Safety instructions should contain climate-related information to successfully address the effects of climate change. The instructions might include guidance on responding to extreme weather events and understanding the potential consequences of sea-level rise on coastal communities. The ferry company staff should also expand their safe behaviour concept to include training and preparation for climate-related incidents. The need to recognise the interconnectedness between climate change, ferry safety and the protection of coastal ecosystems is emphasised in this study. The findings can be utilised by policymakers, regulatory agencies and ferry operators to design holistic policies that improve safety behaviour, minimise maritime mishaps and preserve the long-term sustainability of coastal ecosystems in the face of difficulties posed by climate change.
    Keywords climate change ; coastal ecosystems ; ecological resilience ; humans ; industry ; research ; sea level ; weather ; Malaysia ; Coastal ecosystem ; Climate ; Safety criteria ; Safety behaviour ; Passenger ferry ; Maritime safety
    Language English
    Dates of publication 2023-12
    Publishing place Elsevier Inc.
    Document type Article ; Online
    ZDB-ID 205699-9
    ISSN 1096-0953 ; 0013-9351
    ISSN (online) 1096-0953
    ISSN 0013-9351
    DOI 10.1016/j.envres.2023.117074
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