3356 research outputs found
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REMOTE SENSING BIG DATA ANALYTICS FOR DETAILED GEOLOGICAL MAPPING IN EXPOSED ZONES OF DRY VALLEYS, SOUTH VICTORIA LAND, ANTARCTICA
No full textELUCIDATING 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
No full textBiodiesel 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
KEPELBAGAIAN DAN TABURAN GASTROPOD TERUMBU KARANG DI PULAU DAN KAWASAN TAMAN LAUT TERPILIH DI TERENGGANU, MALAYSIA
No full textKEKAYAAN SPESIES DAN KOMPOSISI LUMUT HATI (MARCHANTIOPHYTA) DALAM TIGA JENIS HUTAN BERBEZA DI TERENGGANU, SEMENANJUNG MALAYSIA
No full textEFFECT OF LACTIC ACID BACTERIA AS BIO-PRESERVATIONFFECT OF LACTIC ACID BACTERIA AS BIO-PRESERVATION AAGAINST SPOILAGE FUNGI FROM PAPAYA FRUITGAINST SPOILAGE FUNGI FROM PAPAYA FRUIT
No full textLactic acid bacteria (LAB) produce several antibacterial compounds, including organic acids that inhibit many types of pathogenic bacteria. The antibacterial activity of LAB with the ability to inhibit growth of pathogenic bacteria associated with foodborne illness is seen as a natural way to improve food safety. This study was carried out to isolate and identify LAB from local pickled guava (Psidium guajava) and papaya (Carica papaya) and to evaluate their antibacterial activity against selected foodborne pathogens. Standard method was used for the isolation of LAB, while identificationwas done based on their morphological characteristics, biochemical reaction and polymerase chain reaction (PCR) amplificationof 16S rRNA gene and sequencing. This study evaluated the ability of cell free supernatant (CFS) of the identifiedLAB to inhibit the growth of selected Gram-positive and Gram-negative foodborne pathogens through microtiter plate method. Determination of the organic acids formation in the CFS that are responsible for the antibacterial activity of the LAB was also conducted using high-performance liquid chromatography (HPLC). The results showed that three LAB from the genus Lactobacillus have been successfully isolated and identifiedas Lactobacillus plantarum (LABP), Lactobacillus reuteri (LABR) and Lactobacillus paracasei (LABC). All three Lactobacillus sp. were able to demonstrate antibacterial activity against foodborne bacterial pathogens used in this study. The results also suggested that the antibacterial activity of CFS of all three Lactobacillus sp. was due to organic acids production
INFLUENCE OF ANTHROPOGENIC POLLUTANTS ON MUD CRAB ECOSYSTEMS TO ENSURE SUSTAINABLE AQUACULTURE AND SAFE CONSUMPTION TO HUMAN HEALTH
Full text linkHeavy metal pollution from anthropogenic activities can harm aquatic ecosystems. This study aims to determine the concentration of
heavy metals (Pb and Cu) in waters, sediments, and mud crabs (Scylla serrata), and to analyze the relationship between environmental
parameters and S. serrata which is consumed by humans. Samples were taken in the mangrove ecosystem around the Tanjung
Api-Api port area in South Sumatra, Indonesia. Pb and Cu analysis used the Atomic Absorption Spectrophotometer (AAS). Pb and
Cu linkages in waters, sediments, and S. serrata analyzed by SigmaPlot V12.5 and Principal Component Analysis (PCA) analyzed by
XLSTAT 2022. The limit consumption of S. serrata was calculated using MWI (MaximumWeekly Intake) and MIT (Maximum Intake
Tolerance). Based on the results, the heavy metal Pb in water was 0.1055 ? 0.1322 mg.L?1, and Cu was not detected. Furthermore,
Pb in sediments ranged from 7.0104 - 11.8186 mg.kg?1, Cu 3.7127 - 4.5347 mg.kg?1, and Pb in S. serrata ranged from 0.0001 -
0.0021 mg.kg?1, and Cu ranged from 0.03 ? 0.0791 mg.kg?1. The concentration of heavy metals in water, sediment, and S. serrata
had not exceeded the specified quality standard, except for Pb in water. The principal component analysis obtained F1 (44.35%), F2
(27.53%) and F3 (17.83%) groups. Based on MWI and MIT values that S. serrata was still safe for human consumption
THE ECONOMIC VALUE OF CITY LANDMARK TO TOURISTS AND ITS ECONOMIC IMPACTS ON LOCAL COMMUNITIES: THE CASE OF TERENGGANU DRAWBRIDGE
Full text linkTITLE PAGE THE IMPACT OF E-HRM ON TALENT MANAGEMENT IN PRIVATE JORDANIAN UNIVERSITIES: THE MEDIATING ROLE OF TOP MANAGEMENT SUPPORT
No full textIn the competitive environment of higher education, effective human resource management is vital for institutional sustainability and success. This study examines the mediating role of top management support in the impact of electronic Human Resource Management (e-HRM) practices on talent management (TM) within private Jordanian universities. Despite the growing adoption of e-HRM systems, research has not sufficiently explored how managerial support influences their effectiveness in optimizing TM, particularly in the context of higher education institutions in Jordan. To address this gap, 340 questionnaires were systematically disseminated to a population of 3,097 academic staff members across 19 private universities in Jordan using proportional and simple random sampling techniques. Data were analyzed using Partial Least Squares Structural Equation Modelling (PLS- SEM) to test the research hypotheses. The findings reveal that e-HRM practices significantly enhance TM by improving recruitment, development, and retention strategies. Furthermore, top management support plays a pivotal mediating role in aligning e-HRM initiatives with institutional goals and employee needs, thereby maximizing their impact. This study contributes to the literature by highlighting the dual importance of advanced HR technologies and robust managerial support in achieving strategic HR objectives in higher education. It offers practical recommendations for private universities in Jordan to refine HR practices, cultivate supportive management cultures, and sustain a competitive edge in a rapidly evolving educational landscape
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
No full textAntimicrobial 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-?-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 ?g/mL. Cytotoxicity
assays confirmed their safety profile at therapeutic concentrations. The biofilm formation
assay demonstrated that 4-deoxy-?-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
