149 research outputs found

    Syngas production via bi-reforming of methane over fibrous KCC-1 stabilized ni catalyst

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    Bi-reforming of methane (BRM) technology has the potential to serve as an alternative energy source while also mitigating greenhouse gas emissions. However, the main hurdle in the commercialization of BRM is catalyst deactivation. In this study, the ultrasonic-assisted impregnation method was utilized to prepare a Ni-based catalyst supported on fibrous KCC-1 and tested in the BRM process. The prepared catalysts were characterized by XRD, BET, FESEM and TPR-H2 techniques to determine the textural and morphological properties of the catalyst. The catalytic performance was tested in a tabular fixed-bed continuous reactor at 800 °C with a stoichiometric feed ratio of 3:2:1 for CH4: H2O: CO2. For high nickel loadings, it was discovered that agglomerates of the Ni-active phase form on the surface of the support. The catalysts with a 10 wt% Ni content produced the best CO2 (79.2%) and CH4 (82.1%) conversions, as well as an optimum H2/CO = 1.62 ratio

    A Laboratory Perspective on an Epidemiological Pattern of Infectious Gastroenteritis: A Five-year Surveillance between 2016 to 2020 from Established Private Healthcare Centers within Klang Valley in Malaysia

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    Infectious gastroenteritis is endemic globally and caused by bacteria, viruses and parasites. The study determined the epidemiological pattern of infectious gastroenteritis within selected urban areas in Malaysia. Analysis of 745 laboratory requests was conducted based on FilmArray gastrointestinal assay and socio-demographic details from suspected cases in KPJ hospitals in Klang Valley, Malaysia, between 2016 to 2020. Descriptive analysis and Fisher-Freeman-Halton Exact testing were performed to ascertain the relationship between socio-demographics with the type of infections. Of 745 requests, 288 (38.7%) were caused by one etiological agent (mono-infection), while the remaining 334 (44.8%) were due to more than one agent (co-infection). Mono-infection was significantly higher among adolescents (n=9; 47.4%) and young adults (n=37; 40.2%) in comparison to adults (n=18; 35.3%). Whereas co-infection was significantly higher in infants (n=216; 49.2%). Mono-infection was mainly caused by bacteria (n=194/288; 67.4%) with Salmonella spp. was prevalent (16.6%), followed by EPEC (12.5%), Campylobacter spp. (11.9%) and Norovirus (10.5%). The co-infections (n=334) were identified with a combination of EPEC and the following bacteria or viruses (Norovirus=38, Campylobacter spp.=30, Salmonella spp.=26, EAEC=22, Rotavirus=19, Adenovirus=10). The month of August to October was recognised as the peak season for infectious gastroenteritis. The present findings may indicate contamination of infectious agents to the food supply and food processing chain as well as reduced hygiene in food sanitation leading to foodborne health issues, particularly among the children in Klang Valley, Malaysia

    FIGURE 2 in Genetic and morphological concordance and discordance within the Cyrtodactylus brevipalmatus group (Squamata: Gekkonidae)

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    FIGURE 2. MFA of the species-level lineages based on the BEAST phylogeny and the percent contribution of the numeric data type to dimensions 1 and 2.Published as part of <i>Grismer, L. Lee, Shahrul Anuar, M. S., Muin, M. A., Ahmad, N. & Quah, Evan S. H., 2023, Genetic and morphological concordance and discordance within the Cyrtodactylus brevipalmatus group (Squamata: Gekkonidae), pp. 265-275 in Zootaxa 5353 (3)</i> on page 269, DOI: 10.11646/zootaxa.5353.3.4, <a href="http://zenodo.org/record/8427451">http://zenodo.org/record/8427451</a&gt

    FIGURE 1. A in Genetic and morphological concordance and discordance within the Cyrtodactylus brevipalmatus group (Squamata: Gekkonidae)

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    FIGURE 1. A. Location of the type locality (star) of Cyrtodactylus breviplamatus at Khao Luang, Nakhon Si Thammarat Provice, Thailand and C. cf. breviplamatus from Langkawi Island, Kedah State, Malaysia. B. Maximum clade credibility BEAST phylogeny of the Cyrtodactylus brevipalmatus group highlighting the sister lineages C. brevipalmatus and C. cf. brevipalmatus. Bayesian posterior probabilities (BPP) are listed at the nodes.Published as part of Grismer, L. Lee, Shahrul Anuar, M. S., Muin, M. A., Ahmad, N. & Quah, Evan S. H., 2023, Genetic and morphological concordance and discordance within the Cyrtodactylus brevipalmatus group (Squamata: Gekkonidae), pp. 265-275 in Zootaxa 5353 (3) on page 266, DOI: 10.11646/zootaxa.5353.3.4, http://zenodo.org/record/842745

    Genetic and morphological concordance and discordance within the Cyrtodactylus brevipalmatus group (Squamata: Gekkonidae)

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    Grismer, L. Lee, Shahrul Anuar, M. S., Muin, M. A., Ahmad, N., Quah, Evan S. H. (2023): Genetic and morphological concordance and discordance within the Cyrtodactylus brevipalmatus group (Squamata: Gekkonidae). Zootaxa 5353 (3): 265-275, DOI: 10.11646/zootaxa.5353.3.4, URL: http://dx.doi.org/10.11646/zootaxa.5353.3.

    Nanocarrier Drug Conjugates Exhibit Potent Anti-<i>Naegleria fowleri</i> and Anti-<i>Balamuthia mandrillaris</i> Properties

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    Given the opportunity and access, pathogenic protists (Balamuthia mandrillaris and Naegleria fowleri) can produce fatal infections involving the central nervous system. In the absence of effective treatments, there is a need to either develop new antimicrobials or enhance the efficacy of existing compounds. Nanocarriers as drug delivery systems are gaining increasing attention in the treatment of parasitic infections. In this study, novel nanocarriers conjugated with amphotericin B and curcumin were evaluated for anti-amoebic efficacy against B. mandrillaris and N. fowleri. The results showed that nanocarrier conjugated amphotericin B exhibited enhanced cidal properties against both amoebae tested compared with the drug alone. Similarly, nanocarrier conjugated curcumin exhibited up to 75% cidal effects versus approx. 50% cidal effects for curcumin alone. Cytopathogenicity assays revealed that the pre-treatment of both parasites with nanoformulated-drugs reduced parasite-mediated host cellular death compared with the drugs alone. Importantly, the cytotoxic effects of amphotericin B on human cells alone were reduced when conjugated with nanocarriers. These are promising findings and further suggest the need to explore nanocarriers as a means to deliver medicine against parasitic infections

    FIGURE 3 in Genetic and morphological concordance and discordance within the Cyrtodactylus brevipalmatus group (Squamata: Gekkonidae)

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    FIGURE 3. Adult female (A) and adult male (B) Cyrtodactylus brevipalmatus from the type locality at Khao Luang National Park, Krung Ching Waterfall, Nakhon Si Thammarat Province, Thailand. Photo from Creative Commons Attribution Share Alike. Adult females of C. cf. brevipalmatus USMHC 2555 (C) and LSUHC 11788 (D) from Gunung Raya, Langkawi Island, Kedah State, Malaysia.Published as part of Grismer, L. Lee, Shahrul Anuar, M. S., Muin, M. A., Ahmad, N. & Quah, Evan S. H., 2023, Genetic and morphological concordance and discordance within the Cyrtodactylus brevipalmatus group (Squamata: Gekkonidae), pp. 265-275 in Zootaxa 5353 (3) on page 270, DOI: 10.11646/zootaxa.5353.3.4, http://zenodo.org/record/842745

    Updated distribution of the Indo-Pacific Slender Gecko, Hemiphyllodactylus typus Bleeker, 1860 (Squamata, Gekkonidae), in Peninsular Malaysia and a discussion of its range expansion

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    Hemiphyllodactylus typus Bleeker, 1860 is a small, nocturnal, scansorial, unisexual gecko having a wide distribution throughout the archipelagos of the Indian and Pacific Oceans. In Peninsular Malaysia, it was previously reported from seven localities. Since then, H. typus has been reported from several new localities based on observations from recent field surveys. The updated distribution records of H. typus in Peninsular Malaysia are compiled here, where it is now known from 18 localities

    Dry reforming of methane over Ni/KCC-1 catalyst for syngas production

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    Dry reforming of methane (DRM) is a trendy topic of investigation as a means of reducing global warming. However, the adoption of DRM for a commercial purpose is still a question due to the deactivation and sintering of catalysts. The performance of the 5Ni/KCC-1 catalyst by using the ultrasonic-assisted impregnation method was examined in this study. The micro-emulsion method and ultrasonic-assisted impregnation method were used to prepare KCC- 1 support and 5Ni/KCC-1 catalyst respectively. The catalyst was characterized by N2 adsorptiondesorption and field emission scanning electron microscopy (FESEM) techniques. FESEM morphology shows that KCC-1 support experienced a well-defined fibrous morphology in a uniform microsphere which can promote high catalytic activity. The results show that the catalyst has optimum performance with higher reactant conversions and H2/CO ratio when operated at 850oC in a tubular furnace reactor as compared to 750oC

    Enhancing Retrofitting Efficiency through 3D Scanning for Selection of Compact Clean Ballast Water Treatment Systems

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    This paper introduces a pioneering 3D scanning approach for preliminary evaluation of Compact Clean type for Ballast Water Treatment System (BWTS) selection, with a focus delivery retrofitting project schedule in shipyard. A comprehensive approach utilizes advanced 3D scanning techniques to capture precise ship geometry and potential location of installation, enabling meticulous assessment of BWTS compatibility within existing structure. Employing 3D models, diverse retrofit scenarios are simulated, offering vital insights for well-informed decision-making. The integrated use of 3D scanning yields substantial advancements in achieving retrofitting objective. This approach demonstrates a high degree of effectiveness in retrofitting, leading to a substantial enhancement in the project schedule, with a remarkable 25% reduction in the time required to complete the retrofitting of the chosen BWTS from the original schedule. It has yielded a commendable 15% reduction in overall costs. Visual representations of retrofit scenarios enhance collaboration among ship owners, BWTS manufacturer, shipyard, supplier and classification society, expediting decision-making and installation procedures. The transformative potential of 3D scanning for BWTS retrofit evaluation is evident in innovative approach were aligned with industry demands for enhanced efficiency and schedule adherence, setting a new benchmark for early project delivery and cost effective BWTS retrofitting. This paper emphasizes the significance of 3D scanning in fostering informed decision-making and operational excellence in retrofitting BWTS on existing ships
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