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Analysis of Entamoeba histolytica Membrane via LC-MALDI-TOF/TOF
Jorim Anak Ujang,Rahmah Noordin,Nurulhasanah Othman 사단법인 한국질량분석학회 2019 Mass spectrometry letters Vol.10 No.3
Liquid chromatography mass spectrometry is widely employed in proteomics studies. One of such instruments is the Liquid Chromatography (LC)-Matrix-assisted laser desorption ionisation (MALDI)-Time of flight (TOF) or LC-MALDI-TOF/TOF. In this study, this instrument was used to identify the membrane proteins of a protozoan parasite namely Entamoeba histo-lytica. It causes amoebiasis in human. The E. histolytica trophozoites were cultured prior to the membrane protein extraction using the conventional method, ProteoPrep® and ProteoExtract® kits. Then, the membrane protein extracts were tryptic- digested and analysed by LC-MALDI-TOF/TOF. Approximately, 194 proteins were identified and 27.8% (54) were predicted as membrane proteins having 1 to 15 transmembrane regions and signal peptides by combining all three extraction methods. Also, this study has discovered 3 unique proteins as compared to our previous study which merit further investigation.
Ani Idris,Effaliza Misran,Noordin Mohd Yusof 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.6
In this study the toxic Cr(VI) which is a common pollutant to the environment is removed from the aqueous solution using the one step photocatalytic reduction to Cr(III) using PVA-alginate encapsulated gFe2O3 magnetic beads. The photocatalytic reduction of Cr(VI) by PVA-alginate encapsulated gFe2O3 magnetic beads was examined under sunlight and other 4 types of lamp: xenon lamp, black light bulb (BLB) lamp, light emitting diode (LED) lamp and fluorescent lamp. The experiments were performed at pH 1, initial Cr(VI) = 50 mg/L and the photocatalyst dosage of maghemite nanoparticles was kept at 8% (v/v). Removal of Cr(VI) was best under sunlight; 100% removal in 30 min, followed by xenon lamp; 100% removal in 100 min, BLB lamp; 70% removal in 100 min. LED and fluorescent lamp have about the same removal rate; 50% removal in 100 min. The Cr(VI) reduction using PVA-alginate magnetic beads fitted the Langmuir–Hinshelwood (L–H) kinetics model with a correlation coefficient (R2) of 0.972. The PVAalginate magnetic beads were capable of treating industrial chromium waste containing 300 mg/L Cr(VI) within 2 h under sunlight.
Multiple Brillouin Stokes Generation Utilizing a Linear Cavity Erbium-Doped Fiber Laser
AL-Mansoori, Mohammed Haydar,Noordin, Nor Kamariah,Saripan, M. Iqbal,Mahdi, Mohd Adzir The Korea Institute of Information and Commucation 2008 Journal of communications and networks Vol.10 No.1
This paper reports the design of a multiwavelength fiber laser source that utilizes a linear cavity of hybrid Brillouin/Erbium fiber laser (BEFL). The output power, threshold power and free running cavity modes were investigated against the pump powers. The structure exhibited low threshold operation of 4 mW at 2.3 mW injected Brillouin pump power. The optimization of Brillouin pump wavelength, power and Erbium gain led to a maximum possible number of channels generated. Simultaneous and stable operation of 21 channels with 10.88 GHz channels spacing were obtained from this architecture at 1 mW injected Brillouin pump power and 90 m W Erbium doped fiber pump power in the 1555 nm region.
A. Davoudinejad,M. Y. Noordin 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.11
This study presents an experimental investigation on turning hardened DF-3 tool steel (~58HRC) with PVD-TiN coated mixed ceramic. We focused on the effect of chamfer and honed edge geometry on tool wear, tool life, cutting forces and surface finish of the machinedworkpiece. The effects of the process parameters on performance characteristics were investigated using ANOVA. It was foundthat longer tool life was recorded with chamfered edge geometry at various cutting conditions. The typical damage observed as flank andcrater wear for ceramic tools and abrasive wear was found as the main mechanism.The optimal cutting speed was 155 m/min, with whicha tolerable tool life and volume of material removal was obtained for both edges geometry. Finer machined surface was left by chamferedtool with feeds and speeds in the range of 0.125-0.05 mm/rev and 155-210 m/min, respectively; also, cutting forces decrease with increasedcutting speed. The obtained consequence of cutting forces shows that tool wear has a considerable effect on cutting forces andgreater forces values recorded with honed tools.
Analysis of Entamoeba histolytica Membrane via LC-MALDI-TOF/TOF
Ujang, Jorim Anak,Noordin, Rahmah,Othman, Nurulhasanah Korean Society for Mass Spectrometry 2019 Mass spectrometry letters Vol.10 No.3
Liquid chromatography mass spectrometry is widely employed in proteomics studies. One of such instruments is the Liquid Chromatography (LC)-Matrix-assisted laser desorption ionisation (MALDI)-Time of flight (TOF) or LC-MALDI-TOF/TOF. In this study, this instrument was used to identify the membrane proteins of a protozoan parasite namely Entamoeba histolytica. It causes amoebiasis in human. The E. histolytica trophozoites were cultured prior to the membrane protein extraction using the conventional method, $ProteoPrep^{(R)}$ and $ProteoExtract^{(R)}$ kits. Then, the membrane protein extracts were trypticdigested and analysed by LC-MALDI-TOF/TOF. Approximately, 194 proteins were identified and 27.8% (54) were predicted as membrane proteins having 1 to 15 transmembrane regions and signal peptides by combining all three extraction methods. Also, this study has discovered 3 unique proteins as compared to our previous study which merit further investigation.
Faridah Hanim Shakirin,Goh Yong Meng,Noordin Mohamed Mustapha,Liang Juan Boo 아세아·태평양축산학회 2020 Animal Bioscience Vol.33 No.12
Objective: This study consisted of two stages; the first was to determine the effect of extrusion and sieving treatments on the chemical properties of palm kernel cake (PKC), and accordingly, a follow-up experiment (second stage) was conducted to determine and compare the apparent metabolizable energy (AME), and protein and amino acid digestibility of extruded and sieved PKC. Methods: Two physical treatments, namely extrusion (using temperature profiles of 90°C/ 100°C/100°C, 90°C/100°C/110°C, and 90°C/100°C/120°C) and sieving (to 8 particles sizes ranging from >8.00 to 0.15 mm) were carried out to determine their effects on chemical properties, primarily crude protein (CP) and fiber contents of PKC. Based on the results from the above study, PKC that extruded with temperature profile 90/100/110°C and of sieved size between 1.5 to 0.15 mm (which made up of near 60% of total samples) were used to determine treatments effect on AME and CP and amino acid digestibility. The second stage experiment was conducted using 64 male Cobb 500 chickens randomly assigned to 16 cages (4 cages [or replicates] per treatment) to the following four dietary groups: i) basal (control) diet, ii) basal diet containing 20% untreated PKC, iii) basal diet containing 20% extruded PKC (EPKC), and iv) basal diet containing 20% sieved PKC (SPKC). Results: Extrusion and sieving had no effect on CP and ash contents of PKC, however, both treatments reduced (p<0.05) crude fiber by 21% and 19%, respectively. Overall, extrusion and sieving reduced content of most of the amino acids except for aspartate, glutamate, alanine and lysine which increased, while serine, cysteine and tryptophan remained unchanged. Extrusion resulted in 6% increase (p<0.05) in AME and enhanced CP digestibility (p<0.05) by 32%, as compared to the untreated PKC while sieving had no effect on AME but improved CP digestibility by 39% which was not significantly different from that by extrusion. Conclusion: Extrusion is more effective than sieving and serves as a practical method to enhance AME and digestibility of CP and several amino acids in broiler chickens.