DSpace Collection:http://umt-ir.umt.edu.my:8080/handle/123456789/213852026-04-06T02:06:28Z2026-04-06T02:06:28ZREMOTE SENSING BIG DATA ANALYTICS FOR DETAILED GEOLOGICAL MAPPING IN EXPOSED ZONES OF DRY VALLEYS, SOUTH VICTORIA LAND, ANTARCTICAPSNZhttp://umt-ir.umt.edu.my:8080/handle/123456789/233852026-01-08T07:59:37Z2025-12-23T00:00:00ZTitle: REMOTE SENSING BIG DATA ANALYTICS FOR DETAILED GEOLOGICAL MAPPING IN EXPOSED ZONES OF DRY VALLEYS, SOUTH VICTORIA LAND, ANTARCTICA
Authors: PSNZ2025-12-23T00:00:00ZELUCIDATION OF ANTIBIOFILM FORMATION MECHANISMS USING MARINE EXTRACTS AGAINST INFECTION AND ANTIMICROBIAL RESISTANCE (AMR) ELUCIDATION OF ANTIBIOFILM FORMATION MECHANISMS USING MARINE EXTRACTS AGAINST INFECTION AND ANTIMICROBIALPSNZhttp://umt-ir.umt.edu.my:8080/handle/123456789/233842026-01-07T16:16:24Z2025-11-24T00:00:00ZTitle: ELUCIDATION OF ANTIBIOFILM FORMATION MECHANISMS USING MARINE EXTRACTS AGAINST INFECTION AND ANTIMICROBIAL RESISTANCE (AMR) ELUCIDATION OF ANTIBIOFILM FORMATION MECHANISMS USING MARINE EXTRACTS AGAINST INFECTION AND ANTIMICROBIAL
Authors: PSNZ
Abstract: Antimicrobial resistance (AMR) has emerged as a global health crisis, with methicillinresistant
Staphylococcus aureus (MRSA) representing one of the most clinically significant
multidrug-resistant pathogens. In this study, three structurally unique anthracycline
derivatives—keto-ester (1), 4-deoxy-ε-pyrromycinone (2), and misamycin (3)—were first
isolated and characterized from the fermentation broth of the marine-derived Streptomyces
tauricus NBUD24. These compounds exhibited notable antibacterial efficacy against MRSA,
with minimum inhibitory concentrations (MICs) ranging from 16 to 32 μg/mL. Cytotoxicity
assays confirmed their safety profile at therapeutic concentrations. The biofilm formation
assay demonstrated that 4-deoxy-ε-pyrromycinone inhibited biofilm formation of MRSA
ATCC43300, with an inhibition rate of 64.4%. Investigations of antibacterial mechanisms
revealed that these compounds exert antibacterial effects primarily through disruption of
bacterial cell wall integrity and destruction of DNA structure. These findings underscore
the potential of marine-derived microbial metabolites as promising scaffolds for developing
next-generation antimicrobial candidates to combat drug-resistant infections.2025-11-24T00:00:00ZELUCIDATING THE CALCIUM OXIDE DERIVED FROM THE WASTE SHELLS OF MUD CLAM (GELOINA EXPANSA) AS A CATALYST FOR BIODIESEL PRODUCTION ELUCIDATING THE CALCIUM OXIDE DERIVED FROM THE WASTE SHELLS OF MUD CLAM (GELOINA EXPANSA) AS A CATALYST FOR BIODIESEL PRODUCTIONPSNZhttp://umt-ir.umt.edu.my:8080/handle/123456789/227582025-10-14T15:05:40Z2025-10-01T00:00:00ZTitle: ELUCIDATING THE CALCIUM OXIDE DERIVED FROM THE WASTE SHELLS OF MUD CLAM (GELOINA EXPANSA) AS A CATALYST FOR BIODIESEL PRODUCTION ELUCIDATING THE CALCIUM OXIDE DERIVED FROM THE WASTE SHELLS OF MUD CLAM (GELOINA EXPANSA) AS A CATALYST FOR BIODIESEL PRODUCTION
Authors: PSNZ
Abstract: Biodiesel is one of the alternative forms of diesel fuel and can be obtained using the transesterification process of waste cooking
oil with a catalyst to accelerate the reaction. The heterogeneous catalyst from waste scallop shells is used due to its potential for
being reused in the subsequent transesterification reactions. Heterogeneous catalysts can also be recycled, contributing to their environmentally
friendly nature. This study aims to identify the performance of recycling a calcium oxide (CaO) catalyst from scallop
shell waste on synthesis biodiesel. The method used is the transesterification method with the basic ingredients of waste cooking
oil using a CaO catalyst. Then, after the transesterification process is complete, the catalyst is separated from the biodiesel and recycled
to be reused in the transesterification process up to five times. The biodiesel samples obtained are identified for yield value,
physico-chemical properties, thermal properties and performance. X-ray diffraction characterization results for the CaO catalyst
show that it has a crystal size of 67.83 nm. Scanning electron microscope characterization shows that it has spherical particle shapes.
Fourier transform infrared characterization shows the presence of Ca–O bonds. The highest biodiesel yield value of 74.23% is obtained
in biodiesel Cycle 1. The flash point value of biodiesel samples ranges from 141.2°C to 149°C. Further, all of the biodiesel samples exhibit
a cetane number of 75. The highest lower heating value of 38.22 MJ/kg is obtained in biodiesel Cycle 1 and the viscosity of the
biodiesel samples ranges from 5.65 to 5.88 cSt. The density of the biodiesel samples ranges from 881.23 to 882.92 kg/m3. Besides, ester
functional groups (C=O) and methyl functional groups have been successfully formed in all samples, with the methyl oleate compound
observed as dominating the biodiesel samples. The cloud point value of the biodiesel samples ranges from 12°C to 13°C, and
their pour point value ranges from 10°C to 12°C. The lead content in biodiesel is 0.8826 mg/kg. The lowest sulphur content is obtained
from biodiesel Cycles 1 and 2 at 0.005%. Performance tests show that biodiesel has lower torque and brake power values than commercial
diesel fuel and higher specific fuel consumption values than commercial diesel fuel.2025-10-01T00:00:00ZCOMPARATIVE ANALYSIS OF WASTE COOKING OIL BIODIESEL MIXED WITH NANOPARTICLE ADDITIVES ON PHYSICOCHEMICAL PROPERTIES AND DIESEL ENGINE PERFORMANCEPSNZhttp://umt-ir.umt.edu.my:8080/handle/123456789/227512025-09-13T09:03:52Z2025-09-01T00:00:00ZTitle: COMPARATIVE ANALYSIS OF WASTE COOKING OIL BIODIESEL MIXED WITH NANOPARTICLE ADDITIVES ON PHYSICOCHEMICAL PROPERTIES AND DIESEL ENGINE PERFORMANCE
Authors: PSNZ
Abstract: The hazardous effect of the pollution of fossil fuels has brought the necessity of shifting
conventional energy sources to renewable and clean ones. In this study, the effect of
hydrogen addition and CeO2 nanoparticle addition in waste cooking palm biodiesel on a
CRDI engine is evaluated. The dosage of the nanoparticle is fixed at 75 ppm and a hydrogen
flow rate of 10 L/min is selected for the engine operations. The crystalline structure of the
nanoparticles is determined by XRD analysis. Results showed that on the addition of both
H2 and CeO2 in a B20 biodiesel blend (80% diesel and 20% biodiesel) the performance,
emission, and combustion parameters of the diesel engine improved compared to neat
diesel. The brake thermal efficiency was improved by 3.53% and brake fuel consumption
was reduced by 16.12% in comparison to diesel at 90% loading condition. The addition of
both nanoparticles and hydrogen in the biodiesel blend lowered the emissions of CO by
30%, and HC and smoke by 50% and 42% respectively. However, NOx increased by 11% as
compared to diesel. A 6% higher HRR values and 8% higher in-cylinder pressure were obtained
while using hydrogen and CeO2 nanoparticle blended biodiesel. This blend also
shows the lowest ignition delay period at full load condition which results in more engine
power and efficiency. This experimental study has helped pave the way for the use of
hydrogen-enriched and nanoparticle-blended biodiesel in place of fossil fuel for the applications
of diesel engines.2025-09-01T00:00:00Z