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Articles 359941 - 359970 of 1183393

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Profiling Of Anti-Diabetic Agent From Pereskia Bleo (Kunth) / Nadzrul Aida Bt Mat Darus, Nadzrul Aida Mat Darus Jan 2015

Profiling Of Anti-Diabetic Agent From Pereskia Bleo (Kunth) / Nadzrul Aida Bt Mat Darus, Nadzrul Aida Mat Darus

Student Works (2010-2019)

Pereskia bleo (Kunth) belongs to the family of Cactaceae and locally known as jarum tujuh bilah. It has been used traditionally by native Malaysian for the treatment of diabetes. However, the lack of scientific data to validate such claim have motivates researcher to study for its anti-diabetic activities. In this study, the leaves, stems and roots of Pereskia bleo crude extracts were extracted with hexane, petroleum ether, chloroform, methanol and aqueous. The separation and detections of bioactive compounds were done using Thin Layer Chromatography (TLC) and Liquid Chromatography Mass spectrometry combined with Mass Spectrometry (LCMS/MS) methods. The TLC results showed …

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Anticancer Effects Of 1’S-1’- Acetoxychavicol Acetate And Its Potentiation When Conjugated With Human Alpha Fetoprotein Against Human Tumours In Mice / Norhafiza Binti Mohd Arshad, Norhafiza Mohd Arshad Jan 2015

Anticancer Effects Of 1’S-1’- Acetoxychavicol Acetate And Its Potentiation When Conjugated With Human Alpha Fetoprotein Against Human Tumours In Mice / Norhafiza Binti Mohd Arshad, Norhafiza Mohd Arshad

Student Works (2010-2019)

Previous in vitro and in vivo studies have reported that 1’S-1’-acetoxychavicol acetate (ACA) and its analogue, 1’S-1’-acetoxyeugenol acetate (AEA) isolated from rhizomes of the Malaysian ethno-medicinal plant Alpinia conchigera Griff (Zingiberaceae) induces apoptosis-mediated cell death in tumour cells via dysregulation of the NF-κB pathway and reduced physiological side effects on non-transformed cells. Nevertheless, there were some clinical development drawbacks such as poor solubility in vivo, depreciation of biological activity and non-specific targeting of tumour cells. In collaborative study with Institute of Engineering Immunology Russia, all the problems above were addressed using their novel drug conjugation technology involving a recombinant human …

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Waste Management By Restaurant Operators In Petaling Jaya / Nasr Eldin Abdallah Elshrif Ebrahiem, Nasr Eldin Elshrif Ebrahiem Jan 2015

Waste Management By Restaurant Operators In Petaling Jaya / Nasr Eldin Abdallah Elshrif Ebrahiem, Nasr Eldin Elshrif Ebrahiem

Student Works (2010-2019)

There are number of factors contribute to municipal waste generation growth rate globally and locally factors are represented by increasing population levels, development, rapid urbanization and the rise in community living standards. Malaysia municipal waste is growing rapidly due to influence by these factors. This makes improving waste management practice highly demanded in every sector producing this waste. Restaurants have credible share in municipal waste as one of major waste source globally and in Malaysia as well, therefore this increase the necessity of study waste management practice among restaurants. This study aims to investigate waste management practice among restaurants in …

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Development And Study Of Conducting Materials For H2o2 And Glucose Sensors / Tilagam A/P Marimuthu, Tilagam Marimuthu Jan 2015

Development And Study Of Conducting Materials For H2o2 And Glucose Sensors / Tilagam A/P Marimuthu, Tilagam Marimuthu

Student Works (2010-2019)

This thesis originated with the development and characterisation of composite materials for sensor applications. This study focused on conducting polymer-metal oxide based composites and silica-titania oxide based composites. The conducting polymer-metal oxide composites were synthesised by chemical polymerisation technique with an aqueous solution of pyrrole monomer in the presence of cobalt and nickel salts. Various analytical techniques were employed to characterise these composites such as field emission scanning electron microscope-energy dispersive x-ray (FESEM-EDX), x-ray powder diffraction (XRPD), Fourier Transform Infrared (FTIR) and thermogravimetric analysis (TGA). These composites were then fabricated into chemical sensor by drop-dry electrodeposition method on glassy carbon …

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Studies On The Growth, Structural And Electrical Properties Of Silicon-Based Heterostructure Nanowires / Qian Guanghan, Guanghan Qian Jan 2015

Studies On The Growth, Structural And Electrical Properties Of Silicon-Based Heterostructure Nanowires / Qian Guanghan, Guanghan Qian

Student Works (2010-2019)

This work reports the investigation of Ni catalyzed Si-based nanowires grown by hot-wire chemical vapor deposition at different filament temperatures on crystal Si (c-Si) and glass substrates These nanowires include NiSi, NiSi/Si core-shell and NiSi/SiC core-shell nanowires that grown by varying the filament temperature, Tf. The NiSi nanowires were grown at lowest Tf of 1150C. At Tf of 1450C, the nanowires were structured by crystalline Si and amorphous Si which Si attributed to the core and shell of the nanowires, respectively. The nanowires exhibited NiSi/SiC heterostructure core-shell nanowires with increase in Tf to 1850C. The morphological properties of these nanowires …

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Synthesis And Characterization Of Cyclodextrin Functionalized Ionic Liquid Polymer For The Extraction Of Phenols / Muggundha Raoov A/L Ramachandran, Muggundha Raoov Ramachandran Jan 2015

Synthesis And Characterization Of Cyclodextrin Functionalized Ionic Liquid Polymer For The Extraction Of Phenols / Muggundha Raoov A/L Ramachandran, Muggundha Raoov Ramachandran

Student Works (2010-2019)

β-Cyclodextrin functionalized ionic liquid polymer (βCD-BIMOTs-TDI) was first synthesized by functionalized β-cyclodextrin (CD) with 1-benzylimidazole (BIM) to form monofunctionalized CD (βCD-BIMOTs), and was further polymerized using toluene diisocyanate (TDI) as a linker to form insoluble βCD-BIMOTs-TDI. The βCDBIMOTs- TDI was characterized using various tools and the results obtained were compared with those derived from the native β-cyclodextrin polymer (βCD-TDI). The scanning electron microscope (SEM) results showed that the presence of ionic liquid (IL) increased the pore size, while the thermo gravimetric analysis (TGA) results showed that the presence of IL increased the stability of the βCD-BIMOTs-TDI. Meanwhile, Brunauer-Emmett-Teller (BET) result …

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Synthesis, Characterization And Fluorescence Properties Of Selected Pyrazine Derivatives / Hasna Nadiah Binti Johari, Hasna Nadiah Johari Jan 2015

Synthesis, Characterization And Fluorescence Properties Of Selected Pyrazine Derivatives / Hasna Nadiah Binti Johari, Hasna Nadiah Johari

Student Works (2010-2019)

Phenoxypyrazine (44), 2-o-methylphenoxypyrazine (46), 2-m-methylphenoxypyrazine (48), 2-p-methylphenoxypyrazine (50) and 2-N-piperidinopyrazine (56) were obtained after the reaction between 2-chloropyrazine (42) with phenol (43), o-cresol (45), m-cresol (47), p-cresol (49) and piperidine (55) respectively. 5-Phenoxypyrazine-2-carboxylic acid methyl ester (58), 5-m-tolyloxypyrazine-2-carboxylic acid methyl ester (59), 5-(-3-nitrophenoxy)pyrazine-2-carboxilic acid methyl ester (61) on the other hand, were obtained after the reaction between 2-chloropyrazine-5-carboxylic acid methyl ester (57) with phenol (43), 3-methylphenol (47), and 3-nitrophenol (60) respectively. While, 2,5-dimethyl-3 phenoxypyrazine (63) were prepared by reacting 3-chloro-2,5-dimethyl pyrazine (62) with phenol (43). Naphthalenyloxy pyrazine derivatives, 2-naphthalen-1-yloxypyrazine (52), and 2-naphthalen-2-yloxypyrazine (54) were prepared by reacting 2-chloropyrazine (42) with …

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Adsorption Studies Of Methylene Blue Using Selected Agro-Wastes As Low Cost Adsorbents / Tiong Khing Gueok, Khing Gueok Tiong Jan 2015

Adsorption Studies Of Methylene Blue Using Selected Agro-Wastes As Low Cost Adsorbents / Tiong Khing Gueok, Khing Gueok Tiong

Student Works (2010-2019)

Today, there are a lot of dyes available commercially. Effluent discharge from textile industries to neighbouring water bodies is currently causing significant health problem. Synthetic dyes used in textile industries, if not treated prior to its disposal can enter our water systems and cause pollution. The study was performed using different agro-wastes namely kenaf (FH 990), banana stem, and sugarcane bagasse to produce low cost industrial adsorbents. Adsorption method was applied in removing methylene blue (MB) dye from aqueous solution. The aims of this study are to investigate the adsorption capacity under optimal parameters and compare the cost effectiveness together …

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Matter-Wave Bright Solitons In Bose-Einstein Condensate / Abdelaziz Benseghir, Abdelaziz Benseghir Jan 2015

Matter-Wave Bright Solitons In Bose-Einstein Condensate / Abdelaziz Benseghir, Abdelaziz Benseghir

Student Works (2010-2019)

We investigate the properties of modulational instability in the Salerno equation in quasi-one dimension in Bose-Einstein condensate (BEC). We analyzed the regions of modulational instability of nonlinear plane waves and determine the conditions of its existence in BEC. The existence and stability of strongly localized modes in discrete media is investigated with the framework of the Salerno model by using a linear analysis method. The regions of stability and instability are determined. Also the existence of localized modes for different values of parameters is shown numerically by homoclinic orbits intersection method. The response of Bose–Einstein condensates is studied with strong …

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Municipal Solid Waste Management Of Indigenous Community In Kampung Kuala Pangsun, Hulu Langat, Selangor / Siti Nur Azlinda Suhada Binti Mohamad Sabri, Siti Nur Azlinda Suhada Mohamad Sabri Jan 2015

Municipal Solid Waste Management Of Indigenous Community In Kampung Kuala Pangsun, Hulu Langat, Selangor / Siti Nur Azlinda Suhada Binti Mohamad Sabri, Siti Nur Azlinda Suhada Mohamad Sabri

Student Works (2010-2019)

With the enactment of Solid Waste and Public Cleansing Management (SWPCM) Act, all solid wastes from household and business are subjected to the Act. However, information on municipal solid waste management of rural communities, especially Orang Asli is inadequate due to lack of research studies. The objectives of the study are to measure amount, types and composition of waste generated, to assess current solid waste management practices and the impact towards the environment, to identify the involvement of Majlis Perbandaran Kajang (MPKj) and Jabatan Kemajuan Orang Asli Malaysia (JAKOA), and to propose for better solid waste management practices. Waste collection, …

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Extrication Of Biodiesel Feedstock From Early Stage Of Food Waste Liquefaction / Maridah Binti Mohd Amin, Maridah Mohd Amin Jan 2015

Extrication Of Biodiesel Feedstock From Early Stage Of Food Waste Liquefaction / Maridah Binti Mohd Amin, Maridah Mohd Amin

Student Works (2010-2019)

This study aims to provide alternative solution in the management of domestic waste and the possibility of using the extracted free fatty acid (FFA) in the food waste as the feedstock for the production of biodiesel. The main concern of acquiring the FFA from the food waste is the challenge which lies during its extraction due to high water content. Prior to the pre-treatment of food waste via the natural biological cycle, the selection of best FFA extraction method was performed on the fresh food waste. It was found that the use of Reflux method is more effective compared to …

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Bioactive 4-Phenylcoumarins From Mesua Elegans And Mesua Kunstleri / Chan Gomathi, Gomathi Chan Jan 2015

Bioactive 4-Phenylcoumarins From Mesua Elegans And Mesua Kunstleri / Chan Gomathi, Gomathi Chan

Student Works (2010-2019)

Phytochemical analyses on the bark of two Clusiaceae plants, Mesua elegans and Mesua kunstleri, were carried out. Twenty-four compounds were successfully isolated using several chromatographic techniques; column chromatography (CC), thin layer chromatography (TLC), preparative thin layer chromatography (PTLC), centrifugal partition chromatography (CPC) and high performance liquid chromatography (HPLC). The structures of the isolated compounds were elucidated using various spectroscopic methods; 1D-NMR (1H, 13C and DEPT), 2D-NMR (COSY, HSQC, HMBC and NOESY), UV, IR, HRESIMS and by comparison with data from the literature. A total of twenty-two compounds were isolated from M. elegans, namely mammea A/BA 28, 5,7-dihydroxy-8-(2-methylbutanoyl)-6-[(E)-3,7-dimethylocta-2,6-dienyl]-4- phenyl-2H-chromen-2-one 47, 5,7-dihydroxy-8-(3-methylbutanoyl)-6-[(E)-3,7- …

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Preparation And Characterization Of Hybrid Organic−Inorganic Nano Composite Coating / Ammar Shafaamri, Ammar Shafaamri Jan 2015

Preparation And Characterization Of Hybrid Organic−Inorganic Nano Composite Coating / Ammar Shafaamri, Ammar Shafaamri

Student Works (2010-2019)

The objective of the present work is to develop organic-inorganic nanocomposite coatings based on epoxy resin and hydroxyl-terminated polydimethylsiloxane (PDMS). The developed PDMS-epoxy polymeric matrix was used as the host for various weight percentages of reinforcement nanoparticles namely SiO2 and ZnO. The employment of organic and inorganic functionalities into a single coating system provides a unique combination of distinctive properties. In this work, embedding nano-sized particles within the polymer matrix was carried out by utilizing the solution intercalation method. After that, the influence of the nanoparticles in enhancing the overall anticorrosion performance and the hydrophobicity properties were investigated. The electrochemical, …

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Extractive Bioconversion Of Polycaprolactone By Lipase In Aqueous Two-Phase System / Chew Pey Ling, Pey Ling Chew Jan 2015

Extractive Bioconversion Of Polycaprolactone By Lipase In Aqueous Two-Phase System / Chew Pey Ling, Pey Ling Chew

Student Works (2010-2019)

Aqueous two-phase system (ATPS) is a technique used for recovery and purification of biomolecules. Extractive bioconversion is a system which integrates biotransformation into ATPS to allow the in situ recovery of bioproducts immediately after they are formed. The extractive bioconversion of poly-ε-caprolactone (PCL) in an ATPS had not been established. In addition, the properties of the products obtained following the extractive bioconversion process are not well understood. Therefore, this study aimed to determine the ideal conditions for Burkholderia cepacia lipase-mediated extractive bioconversion of PCL in a polyethylene glycol (PEG)-based ATPS, as well as to examine the properties of the products …

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Ultra-Wideband Soa Fibre Laser / Nor Ahya Hassan, Nor Ahya Hassan Jan 2015

Ultra-Wideband Soa Fibre Laser / Nor Ahya Hassan, Nor Ahya Hassan

Student Works (2010-2019)

A comprehensive study has been conducted on an ultra-wideband semiconductor optical amplifier (SOA) for the generation of ultra-wideband fibre lasers of various attributes throughout this dissertation. The fundamental characteristics of the ultrawideband SOA such as the gain and noise figure (NF) are successfully investigated by utilizing the conventional method of measurement and described in the earlier part of the thesis. A result of high gain with small NF drawbacks and coverage of three communication bandwidth regions of more than 120 nm, of short (S-) band, conventional (C-) band and long (L-) band is achieved. The ultra-wide band coverage of the …

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Cloud Point Extraction Method For The Removal Of Phenolic Compounds From Water Samples Using Dc193c Non−Ionic Surfactant / Nur Nadhirah Mohamad Zain, Nur Nadhirah Mohamad Zain Jan 2015

Cloud Point Extraction Method For The Removal Of Phenolic Compounds From Water Samples Using Dc193c Non−Ionic Surfactant / Nur Nadhirah Mohamad Zain, Nur Nadhirah Mohamad Zain

Student Works (2010-2019)

A greener method based on cloud point extraction was optimized in three systems namely as cloud point extraction (CPE); CPE with β−cyclodextrin (CPE−βCD) and CPE with β−cyclodextrin functionalized with ionic liquids (CPE−βCD−IL) for removing phenolic compounds including 2,4−dichlorophenol (2,4−DCP), 2,4,6−trichlorophenol (2,4,6−TCP) and 4−nitrophenol (4−NP) in aqueous samples by using UV−Vis spectrophotometric technique. The DC193C surfactant was chosen as an extraction solvent due to its low water content in a surfactant rich phase. The parameters affecting the extraction efficiency such as pH, equilibration temperature and incubation time, concentration of surfactant, modifier, salt and analyte, volume of surfactant and modifier and water …

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Studies Of Breeding Habitats And Seasonal Occurrence Of Mosquitoes In Putrajaya And Kuala Selangor, With Laboratory Experiments Of Guppies And Dragonfly Nymphs As Potential Biocontrol Predators Against Mosquito Larvae / Siti Nurhafizah Saleeza Ramlee, Siti Nurhafizah Saleeza Ramlee Jan 2015

Studies Of Breeding Habitats And Seasonal Occurrence Of Mosquitoes In Putrajaya And Kuala Selangor, With Laboratory Experiments Of Guppies And Dragonfly Nymphs As Potential Biocontrol Predators Against Mosquito Larvae / Siti Nurhafizah Saleeza Ramlee, Siti Nurhafizah Saleeza Ramlee

Student Works (2010-2019)

Mosquito control is essential for the control of vector borne diseases. Many synthetic insecticides are widely used for controlling adult and larval mosquito populations. However, there are multirole effects: e.g. the harmful effects of chemicals on non-target organisms, the development of resistance to these chemicals in mosquitoes and the recent resurgence of different mosquito-borne diseases. The objectives of this study are to determine the potential breeding habitats of the mosquitoes, mosquito indices, mosquito species, density of mosquito larvae, perceptions of respondents on bio control and to conduct captivity studies on predator–prey relationships. Entomological surveillance was carried out in six localities …

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Computational Studies Of Glycolipids And Their Interactions With Carbon Nanotubes / Zahrabatoul Mosapour Kotena, Zahrabatoul Mosapour Kotena Jan 2015

Computational Studies Of Glycolipids And Their Interactions With Carbon Nanotubes / Zahrabatoul Mosapour Kotena, Zahrabatoul Mosapour Kotena

Student Works (2010-2019)

Carbon nanotubes (CNTs) have attracted the attention of many researchers due to their unique mechanical, structural, and electrical properties, and their apparent usefulness in nanotechnology, nanoelectronics, biosensors, biotechnology, biomedicine, and energy storage. Single-walled nanotubes (SWNTs) could be dispersed by surfactants, such as glycopyranoside, which is a family of non-ionic surfactants, from the more generic class of glycolipids found in nature, especially in biological membranes. Hydrogen bond is a dominant factor in different biological processes. This thesis focuses on the knowledge of the hydrogen bond formation in non-ionic surfactant such as glycolipids. Subsequently, we examined the effect of one of these …

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Preparation And Characterization Of Rice Starch Based Solid Polymer Electrolytes For Dye−Sensitized Solar Cell Application / Mohammad Hassan Khanmirzaei, Mohammad Hassan Khanmirzaei Jan 2015

Preparation And Characterization Of Rice Starch Based Solid Polymer Electrolytes For Dye−Sensitized Solar Cell Application / Mohammad Hassan Khanmirzaei, Mohammad Hassan Khanmirzaei

Student Works (2010-2019)

Biodegradable polymers have economic and environmental benefits due to cheap in cost and biodegradability. Utilizing environmental friendly polymers in polymer electrolytes and electronics field can be good replacement for some harmful existing materials and admirable category for green energy applications such as solar cells, specifically, dye sensitized solar cells, super capacitors, batteries, etc. Solid polymer electrolyte (SPE) systems based on rice starch as a biodegradable polymer, three iodide salts namely lithium iodide, ammonium iodide and sodium iodide, and two ionic liquids namely 1-methyl-3-propylimidazolium iodide (MPII) and 1-hexyl-3-methylimidazolium iodide (HMII) were studied for dielectric properties and solar cell applications in this …

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Fiber Optic Parametric Amplification (Fopa) Simulation In A Highly Nonlinear Fiber (Hnlf) / Thong May Han, May Han Thong Jan 2015

Fiber Optic Parametric Amplification (Fopa) Simulation In A Highly Nonlinear Fiber (Hnlf) / Thong May Han, May Han Thong

Student Works (2010-2019)

Four wave mixing (FWM) is a nonlinear e�ect observable in optical �bers when light of two or more wavelengths are launched into the �ber. Parametric ampli�cation is a consequence of FWM, where depending on the phase di�erence between the waves, power transfer between the interacting waves could take place. We are interested in the generation of this phenomenon in optical �bers to create Fiber Optical Para- metric Ampli�ers (FOPA). In this paper, we simulated the parametric ampli�cation process in a highly nonlinear �ber (HNLF), focusing on the e�ect of di�erent values of the initial linear phase mismatch ��, pump power …

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Isolation And Characterisation Of Metal-Tolerant Actinomycetes From A Karstic Cave In Malaysia / Yap Siew Mei, Siew Mei Yap Jan 2015

Isolation And Characterisation Of Metal-Tolerant Actinomycetes From A Karstic Cave In Malaysia / Yap Siew Mei, Siew Mei Yap

Student Works (2010-2019)

The main objective of this study was to isolate actinomycetes from environmental samples collected from the Dark Caves, a karstic cave located in Batu Caves, Kuala Lumpur, Malaysia. The environmental samples were collected from different parts of the cave including cave ceilings, columns, soils and stalagmites. Results showed the number of actinomycetes isolated from cave soils was the highest among all sampling sites, followed by cave wall, cave columns and the lowest was from stalagmite. A few types of isolation media were used to selectively isolate actinomycetes and the results showed higher percentage of total actinomycete isolates were obtained from …

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The Study Of Surface Physico-Chemical Properties Of Alcohol-Water Mixtures Using Reverse-Flow Gas Chromatography / Mohammad Hafiz Bin Hamzah, Mohammad Hafiz Hamzah Jan 2015

The Study Of Surface Physico-Chemical Properties Of Alcohol-Water Mixtures Using Reverse-Flow Gas Chromatography / Mohammad Hafiz Bin Hamzah, Mohammad Hafiz Hamzah

Student Works (2010-2019)

Spillage of volatile chemicals such as organic solvents into aquatic environment via various industrial activities has been a growing major worldwide concern. These volatile chemicals may spread into the atmosphere via evaporation and diffusion. Evaporation is a process where a substance in liquid phase is converted into the vapor phase. Reversed– flow gas chromatography (RF-GC) technique which is one of the perturbation gas chromatography techniques was used to determine the rate coefficient for evaporation and diffusion coefficients (D) of selected alcohols. The main objectives of this study are to determine the effect of water on the evaporation of alcohols from …

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Synthesis, Characterization And Theoretical Study Of Amino Acid-Based Magnetic Molecularly Imprinted Polymer For Recognition Of Sulfonamide Drugs / Chen Lei, Lei Chen Jan 2015

Synthesis, Characterization And Theoretical Study Of Amino Acid-Based Magnetic Molecularly Imprinted Polymer For Recognition Of Sulfonamide Drugs / Chen Lei, Lei Chen

Student Works (2010-2019)

Sulfonamides antibiotics (SAs) are the oldest and among the most widely used antibacterial agent in the world. Due to its low cost and their relative efficacy in controlling some common bacterial related diseases, SAs have been widely used in various sectors. Since huge amount of SAs have been consumed every year, SAs have been released into the environment through various human activities. Among various classes of pharmaceutical, the presence of antibiotics in the environments has been one of the major concerns due to its ability to develop antibiotic-resistant bacteria. Thus, it is essential to develop an efficient method for the …

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Nickel Tetrasulphonated Phthalocyanine (Nitspc) Nanostructures Via Polycarbonate Membrane: Enhancement On Optical, Morphological And Electrical Properties / Mirza Mohd Fawwaz Bin Faizan Beg, Mirza Mohd Fawwaz Faizan Beg Jan 2015

Nickel Tetrasulphonated Phthalocyanine (Nitspc) Nanostructures Via Polycarbonate Membrane: Enhancement On Optical, Morphological And Electrical Properties / Mirza Mohd Fawwaz Bin Faizan Beg, Mirza Mohd Fawwaz Faizan Beg

Student Works (2010-2019)

Nickel tetrasulfonated phthalocyanine (NiTsPc) with planar aromatic structures is an ideal building block for organic nanostructures. NiTsPc can self-assemble into stacks through π–π interaction, exhibit high thermal and chemical stabilities, and possess outstanding electrical and optical properties. In this paper, the optical, morphological and electrical properties of NiTsPc nanostructures were investigated. NiTsPc nanostructures were synthesized via polycarbonate membrane of immersion technique. The polycarbonate membrane was immersed in NiTsPc solution for 1 hour and 24 hours. Different annealing temperatures of 50 °C and 100 °C were applied prior to the dissolution of polycarbonate membranes. NiTsPc nanostructures were characterised by UV-Vis spectroscopy, …

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Comparative Biochemical Characterization Of Drosophila Melanogaster Epsilon Class Glutathione S-Transferase, Dmgste6 And Dmgste7 / Vennobaahshini A/P Venu, Vennobaahshini Venu Jan 2015

Comparative Biochemical Characterization Of Drosophila Melanogaster Epsilon Class Glutathione S-Transferase, Dmgste6 And Dmgste7 / Vennobaahshini A/P Venu, Vennobaahshini Venu

Student Works (2010-2019)

The study compares the biochemical behavior of two epsilon class Glutathione S- Transferase (GSTs) genes from Drosophila melanogaster, namely gste6 and gste7. Both GSTs were cloned, expressed and homogenously purified using a combination of anionic exchange chromatography and GSH-affinity matrix. Bioinformatics analysis indicated that both shared 83% and 69% amino acid sequence similarity and identity respectively. Each GSTE6 shared 79% and 77% similarity and GSTE7 has 77% similarity towards GST6A and GST6B of Musca domestica, respectively which are known to participate in resistance towards insecticides. The expressed recombinant proteins were tested for their activity towards 12 model substrates. Based on …

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Socio-Economic Analysis On Waste Pickers In Selected Municipal Solid Waste Disposal Sites In Malaysia / Aida Husna Binti Zahariman, Aida Husna Zahariman Jan 2015

Socio-Economic Analysis On Waste Pickers In Selected Municipal Solid Waste Disposal Sites In Malaysia / Aida Husna Binti Zahariman, Aida Husna Zahariman

Student Works (2010-2019)

Waste production in Malaysia has increased to 30,000 ton per day. It is estimated that 90% of the waste is sent to landfills without any recovery of recyclable materials. This situation provides the waste pickers with a way to make a living by recovering the said materials. The purpose of this study is to understand the socio-economics of the waste pickers in three landfills in Selangor. The three landfills are: a sanitary landfill in Jeram, a non-sanitary landfill in Dengkil, and an open landfill in Bukit Beruntung. Both the Jeram and Dengkil landfills are under the management of Worldwide Holdings, …

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Theory Of Phase Transitions In Ferroelectric Superlattices / Lim Kok Geng, Kok Geng Lim Jan 2015

Theory Of Phase Transitions In Ferroelectric Superlattices / Lim Kok Geng, Kok Geng Lim

Student Works (2010-2019)

Ferroelectric superlattices comprising two or more different layers are currently a topic of active research because of their potential applications in memories and fundamental scientific interest. A thermodynamic model based on the Landau-Ginzburg theory is proposed to study the phase transitions in ferroelectric superlattices. An interface energy term is introduced in the free energy to describe the formation of intermixed layer with properties different from those of both layers. These intermixed layers are mutually coupled through the local polarization at interfaces. The effects of electrostatic coupling and interface intermixing on the internal electric field and polarization of superlattices which composed …

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Weakly Clean And Related Rings / Qua Kiat Tat, Kiat Tat Qua Jan 2015

Weakly Clean And Related Rings / Qua Kiat Tat, Kiat Tat Qua

Student Works (2010-2019)

Let R be an associative ring with identity. Let Id(R) and U(R) denote the set of idempotents and the set of units in R, respectively. An element x 2 R is said to be weakly clean if x can be written in the form x = u+e or x = u−e for some u 2 U(R) and e 2 Id(R). If x is represented uniquely in this form, whether x = u + e or x = u − e, then x is said to be uniquely weakly clean. We say that x 2 R is pseudo weakly clean if …

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Dynamics Of Attached And Free-Living Bacterial Population In Tropical Coastal Waters / Lee Siew Wen, Siew Wen Lee Jan 2015

Dynamics Of Attached And Free-Living Bacterial Population In Tropical Coastal Waters / Lee Siew Wen, Siew Wen Lee

Student Works (2010-2019)

We investigated the dynamics of attached and free-living bacterial abundance over a period of 18 months in tropical coastal waters of Malaysia. We measured at both oligotrophic coastal water (Port Dickson) and eutrophic estuary (Klang), and hypothesized that attached bacteria are predominant in eutrophic waters. We also addressed whether attached and free-living bacteria differ phylogenetically. We found that bacterial abundance was higher at Klang than Port Dickson (Student’s t-test: t = 4.87, df = 19, P < 0.001). Attached bacteria also formed a large fraction of the total bacteria at Klang (75 ± 13%) relative to Port Dickson (56 ± 22%), and showed preference for chlorophyll a based particles rather than total suspended solids. The bacterial community structure was clearly different between the two stations but was similar between the attached and free-living bacterial population. Our results showed the importance of attached bacteria in eutrophic water where they could play a major role in carbon and nutrient cycling.

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Proteins Inhibiting Angiotensin Converting Enzyme Derived From Pleurotus Pulmonarius Mycelium (Fr.) Quél / Badjie Xietaqieuallah Binti Ibadallah, Badjie Xietaqieuallah Ibadallah Jan 2015

Proteins Inhibiting Angiotensin Converting Enzyme Derived From Pleurotus Pulmonarius Mycelium (Fr.) Quél / Badjie Xietaqieuallah Binti Ibadallah, Badjie Xietaqieuallah Ibadallah

Student Works (2010-2019)

Pleurotus pulmonarius (grey oyster mushroom) is a well-known edible mushroom that has been acknowledged as a curative agent for many diseases. The antihypertensive potential of Pleurotus pulmonarius mycelium was investigated in vitro via angiotensin converting enzyme (ACE) inhibitory activity. The study was commenced with cultivation of P. pulmonarius mycelium using small scale liquid submerged fermentation for seven days in which brown sugar-spent yeast medium was used as substrate. The mycelial yield was separated from the whole broth to produce mycelial aqueous extract and broth extract, respectively. A preliminary ACE inhibitory assay was performed on the mycelial aqueous extract and broth …

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