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2014

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Numerical Investigation Of The Performance Of Interior Permanent Magnet Synchronous Motor Drive / Shahida Pervin, Pervin Shahida Jan 2014

Numerical Investigation Of The Performance Of Interior Permanent Magnet Synchronous Motor Drive / Shahida Pervin, Pervin Shahida

Student Works (2010-2019)

The interior permanent magnet synchronous motor (IPMSM) is getting popular in industrial drives because of its' advantageous features such as high power to weight ratio, high efficiency, high power factor, low noise, and robustness. The vector control technique is widely used for high performance IPMSM drive as the motor torque and flux can be controlled separately. Fast and accurate response, quick recovery of speed from any disturbances and insensitivity to parameter variations are some of the important characteristics of high performance drive system used in electric vehicles, robotics, rolling mills, traction and spindle drives. Despite many advantageous features of IPMSM, …

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Synthesis, Characterization And Adsorption Properties Of Molecularly Imprinted Silica Gel For The Removal Of 2-Hydroxybenzoic Acid (2-Ha) From Aqueous Solution / Siti Farhana Bt Abdul Raof, Abdul Raof Siti Farhana Jan 2014

Synthesis, Characterization And Adsorption Properties Of Molecularly Imprinted Silica Gel For The Removal Of 2-Hydroxybenzoic Acid (2-Ha) From Aqueous Solution / Siti Farhana Bt Abdul Raof, Abdul Raof Siti Farhana

Student Works (2010-2019)

A molecularly-imprinted silica gel (MISG) sorbent for selective removal of 2-hydroxybenzoic acid (2-HA) was prepared by a surface imprinting technique with a sol gel process. The 2-HA-imprinted silica sorbent was evaluated by parameters including influence of pH, static, kinetic adsorption and selectivity experiments. The optimum pH for maximum adsorption capacity to the 2-HA appeared around pH 2 by the polymer. Also, the imprinted sorbent has a fast uptake kinetics which is obtained within a short shaking period of 5 min. When the initial concentration of 2-HA solution increases from 20 ppm to 400 ppm, the adsorbed amount of 2-HA increases …

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The Community Structure Of Forensically Important Flies And Beetles On An Altitudinal Gradient On Gunung Ulu Kali, Peninsular Malaysia / Thary Bin Gazi, Thary Gazi Jan 2014

The Community Structure Of Forensically Important Flies And Beetles On An Altitudinal Gradient On Gunung Ulu Kali, Peninsular Malaysia / Thary Bin Gazi, Thary Gazi

Student Works (2010-2019)

While present in crime scenes and succession studies, little is known about the ecology and taxonomy of forensically important necrophagus beetles. Natural gradients such as mountains were used to determine how certain groups of animals react to changes in the environment. A survey of forensically important beetles was conducted along an altitudinal gradient on Gunung Ulu Kali using pitfall trapping. The corresponding diversity of blowflies was collected in the same site. Thirty three species of beetles were recorded, with the highest species richness found in the lowland forest at 200m. The beetle and fly communities above 1000m height had less …

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Determination Of Simazine In Fish And Shrimp Samples Using Ultra Performance Liquid Chromatography Tandem Mass Spectrometer (Uplc-Ms/Ms) / Amirul Ashraf Bin Jamaluddin, Jamaluddin Amirul Ashraf Jan 2014

Determination Of Simazine In Fish And Shrimp Samples Using Ultra Performance Liquid Chromatography Tandem Mass Spectrometer (Uplc-Ms/Ms) / Amirul Ashraf Bin Jamaluddin, Jamaluddin Amirul Ashraf

Student Works (2010-2019)

Ultra performance liquid chromatography tandem mass spectrometry (UPLC-MS/MS) method was successfully developed and validated for the analysis of simazine in fish and shrimp samples at trace levels to meet European Union requirements and import requirements from certain countries. This method also utilized a simple, fast and inexpensive extraction technique called QuECheRS (quick, easy, cheap, rugged and safe). Matrix-matched calibration standard are used to construct a calibration curve and Ethoprophos is used as internal standard. At optimal conditions, the chromatographic separation was achieved in less than 10 minutes with the total run time of 13.5 minutes. The mean recoveries for fish …

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Documentation And Valuation Of Plant Resources Used By The Orang Asli At Kampung Lubuk Ulu Legong, Baling, Kedah / Nur Shahidah Binti Mohammad, Mohammad Nur Shahidah Jan 2014

Documentation And Valuation Of Plant Resources Used By The Orang Asli At Kampung Lubuk Ulu Legong, Baling, Kedah / Nur Shahidah Binti Mohammad, Mohammad Nur Shahidah

Student Works (2010-2019)

This study was carried out to identify, characterize and valuate the plant resource used by the Orang Asli in Kampung Lubuk Ulu Legong, Baling, Kedah. The data for this study was collected through home garden plants survey, wild plant survey and structured interviews with the villagers. During this study a total of 175 plants species were encountered of which 68 species were cultivated, 91 species were wild and 16 species were both cultivated and wild. Among the cultivated plants the family Euphorbiaceae recorded the highest number of species. Among the wild plants, the family Arecaceae recorded the highest number of …

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Chemical Constituents Of Ochreinauclea Maingayii (Hook.F.) Ridsd. (Rubiaceae) / Norfaizah Osman, Norfaizah Osman Jan 2014

Chemical Constituents Of Ochreinauclea Maingayii (Hook.F.) Ridsd. (Rubiaceae) / Norfaizah Osman, Norfaizah Osman

Student Works (2010-2019)

A study of chemical constituents from the leaves and bark of Ochreinauclea maingayii (Hook. f.) Ridsd. from the family Rubiaceae has been carried out. Nine compounds were successfully isolated and purified by applying chromatography techniques such as column chromatography (CC), thin layer chromatography (TLC) and preparative thin layer chromatography (PTLC). The compounds were harmane 38, naucledine 5, cadamine 42, isodihydrocadambine 78, neonaucline 79, cinnamide 81, benzamide 80, blumenol A 75 and ursolic acid 73. Neonaucline 75 is a new compound from the leaves of this species. All structures were elucidated by the means of spectroscopic method; 1H, 13C NMR, 2D …

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Determination Of Fluid Dynamic Bearing (Fdb) Oil And Pivot Grease In Hard Disk Drive Components Via Gas Chromatography-Mass Spectrometry / Goh Yin Shean, Yin Shean Goh Jan 2014

Determination Of Fluid Dynamic Bearing (Fdb) Oil And Pivot Grease In Hard Disk Drive Components Via Gas Chromatography-Mass Spectrometry / Goh Yin Shean, Yin Shean Goh

Student Works (2010-2019)

Fluid dynamic bearing (FDB) oil and pivot grease are used as lubricant in the spindle motor and in the actuator pivot bearing cartridge in the hard disk drive (HDD). The presence of high amount of both FDB oil and pivot grease in hard disk drive may lead to the drive failure. Determination of FDB oil and pivot grease presence in the HDD after 300 hours, 600 hours and 900 hours of testing in reliability chamber was done by extracting the recirculation filter and adsorbent breather filter in the HDD using hexane as the solvent. The presence of FDB oil and …

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Investigation On Pema/Pvdf–Hfp Blend Polymer Electrolytes Incorporated With Carbonate–Based Plasticizers And Imidazolium–Based Ionic Liquids / Sim Li Na, Li Na Sim Jan 2014

Investigation On Pema/Pvdf–Hfp Blend Polymer Electrolytes Incorporated With Carbonate–Based Plasticizers And Imidazolium–Based Ionic Liquids / Sim Li Na, Li Na Sim

Student Works (2010-2019)

Lithium ion–based polymer blend electrolytes are developed. Poly(ethyl methacrylate) (PEMA)/poly(vinylidene fluoride–co–hexafluoropropylene) (PVdF–HFP) blend is used as polymer host and lithium trifluoromethanesulfonate (LiTf) salt is used as lithium ion (Li+) source. Reflux and solution cast techniques are employed to produce sample films. Optimized polymer blend–salt composition is added with varied weight percentages (wt. %) of ethylene carbonate (EC) and propylene carbonate (PC) as plasticizers as well as 1–butyl–3–methyl imidazolium trifluoromethanesulfonate (BMITf) and 1–butyl–3–methyl imidazolium iodide (BMII) ionic liquids. Five polymer electrolyte systems are used in this project: PEMA/PVdF–HFP–LiTf, PEMA/PVdF–HFP–LiTf–EC, PEMA/PVdF–HFP–LiTf–PC, PEMA/PVdF–HFP–LiTf–BMII and PEMA/PVdF–HFP–LiTf–BMITf. Electrochemical impedance spectroscopy (EIS) studies show that the …

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Fatty Acid Liposomes In Cosmetic Cream / Chia Si Wai, Si Wai Chia Jan 2014

Fatty Acid Liposomes In Cosmetic Cream / Chia Si Wai, Si Wai Chia

Student Works (2010-2019)

Liposomes have been used widely as carriers for active ingredients in cosmetic because of their ability to encapsulate both hydrophilic and hydrophobic compounds. In this work, fatty acid liposomes were prepared and introduced into olive oil-in-water emulsions stabilized by C14–C18 sucrose ester mixtures at pH 8.5. Light microscopy images of the emulsions showed evidence of the coexistence of oleic acid liposomes and the emulsion droplets. As alkyl chain length of sucrose ester increased, the average droplet size decreased, while the zeta potential became more negative. Further decrease of droplet size was observed when borate buffer was added to the aqueous …

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Petrology And Geochemistry Of The Teluk Ramunia Volcanics, Southeastern Johor,Peninsular Malaysia; Implication For Middle Triassic Tectonic / Muhammad Hatta Bin Roselee, Muhammad Hatta Roselee Jan 2014

Petrology And Geochemistry Of The Teluk Ramunia Volcanics, Southeastern Johor,Peninsular Malaysia; Implication For Middle Triassic Tectonic / Muhammad Hatta Bin Roselee, Muhammad Hatta Roselee

Student Works (2010-2019)

The main objective of this study is to investigate the petrology, geochemistry and petrogenesis of volcanic rocks from southeast Peninsular Malaysia mainly within Teluk Ramunia. The volcanic rocks from that area are located on the eastern belt magmatism dominated by I-type rocks. The rocks from study area are dominated by rhyolite, trachydacite and diorite and they show irregular contact which suggests contemporaneous crystallization. Petrographically, all rocks shows occurrence of microgranophyric, interstitial biotite and hornblende which is characteristic of the Atype rocks and sub-volcanic emplacement. Field and geochemical evidence shows that the rhyolite is derived from a different magmatic pulse than …

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Archaea Diversity In The Coastal Waters Of West Peninsular Malaysia / Saw Suet Yit, Suet Yit Saw Jan 2014

Archaea Diversity In The Coastal Waters Of West Peninsular Malaysia / Saw Suet Yit, Suet Yit Saw

Student Works (2010-2019)

In this study, we explored the archaea diversity in four locations (Kuala Selangor, Port Klang, Port Dickson, Sungai Muar) along the Straits of Malacca using the cloning method. Four 16S rDNA clone libraries were constructed with archaea specific primers (Arc21F and Arc958R), and in total, 1074 randomly selected clones were screened by PCR-restriction fragment length polymorphism (PCR-RFLP) analysis using three different restriction enzymes (RsaI, CfoI, and DdeI). Majority of the sequences from three clone libraries were affiliated to Euryarchaeota whereas one clone library (Kuala Selangor) was dominated by Thaumarchaeota sequences. Phylogenetic analysis of 16S rDNA sequences showed high archaea diversity …

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Synthesis Of Palm-Based Zinc Soaps For Compounding In Rubber Products / Chua Wei Keong, Wei Keong Chua Jan 2014

Synthesis Of Palm-Based Zinc Soaps For Compounding In Rubber Products / Chua Wei Keong, Wei Keong Chua

Student Works (2010-2019)

The melting point is the main factor in which metallic soap is to use as additives for the rubber manufacturing. This rubber compounder is the making stock for transfer moulding, compression, extruded profiles or hoses, the curing temperature or moulding and the duration will limit to the materials to be embedded on the surface of the compound. Zinc stearate has the lowest melting point as compared to other metallic soap. Although it has a low melting point, but it still consider high and problematic to the compounding system. The main objective in this study is to synthesis a various zinc …

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Investigation Of Dynamical Structure Of Solar Radio Burst Type Iii And The Tendencies To Form Type Ii Burst Based On Coronal Mass Ejections Events (Cmes) In Low Frequency Radio Region / Zety Sharizat Binti Hamidi, Zety Sharizat Hamidi Jan 2014

Investigation Of Dynamical Structure Of Solar Radio Burst Type Iii And The Tendencies To Form Type Ii Burst Based On Coronal Mass Ejections Events (Cmes) In Low Frequency Radio Region / Zety Sharizat Binti Hamidi, Zety Sharizat Hamidi

Student Works (2010-2019)

Coronal Mass Ejections (CMEs) are well known as one of the most massive eruptions which potentially create major disturbances in the interplanetary medium and initiate severe magnetic storms when they collide with the Earth‟s magnetosphere. As indicated with radio signatures so-called type II and III burst it also divided by sub-type of burst depending on the physical characteristics and different mechanisms. For empirical case studies, the statistical properties of both solar bursts by using the Compound Astronomical Low-cost Low-frequency Instrument for Spectroscopy in Transportable Observatories (CALLISTO) network data has been analyzed. The aim of the present study is to reveal …

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Ao-Benzothiazole Chromophore Based Liquid Crystalline Monomers And Their Polymerization For New Side Chain Liquid Crystalline Polymers / Md. Rabiul Karim, Md. Rabiul Karim Jan 2014

Ao-Benzothiazole Chromophore Based Liquid Crystalline Monomers And Their Polymerization For New Side Chain Liquid Crystalline Polymers / Md. Rabiul Karim, Md. Rabiul Karim

Student Works (2010-2019)

Azo-benzothiazole chromophore based new polymerizable liquid crystalline (LC) monomers, M1-M10, having different terminal substituents (CH3, OCH3, OC2H5, F, Cl etc.) at the sixth position on the benzothiazole moiety were successfully synthesized via azo coupling followed by etherification and esterification reactions. The newly synthesized monomers showed good to excellent thermal stability with decomposition temperatures corresponding to 5% weight loss in the range of 280-320oC. The LC properties of the synthesized monomers were confirmed via DSC and POM. Monomers (M1, M5 and M6) bearing H, F and Cl at the sixth position on the benzothiazole moiety revealed only smectic phase whereas CH3, …

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Synthesis, Characterization And Biological Applications Of Some Acetylpyridine, Acetophenone Derivatives And Their Metal Complexes / Nura Suleiman Gwaram, Nura Suleiman Gwaram Jan 2014

Synthesis, Characterization And Biological Applications Of Some Acetylpyridine, Acetophenone Derivatives And Their Metal Complexes / Nura Suleiman Gwaram, Nura Suleiman Gwaram

Student Works (2010-2019)

A series of compounds derived from 2-acetylpyridne or acetophenones with morpholine, piperazine and piperidine moeity were synthesized and structurally characterized. The compounds were analysed for in silico, in vitro and in vivo biological applications (anti-cancer, anti-bacteria, anti-Alzheimer and anti-ulcer). They were first screened for in vitro anti-bacterial activity against Methicillin-resistant Staphylococcus aureus (MRSA), Acinetobacter baumanni (AC), Klebsiella pneumonie (KB) and Pseudomonas aeruginosa (PA) using the disc diffusion and micro broth dilution assays. Based on the overall results, they showed the highest activities against MRSA while a weak antibacterial activity was observed against A. baumanii and P. Aeruginosa. Another second series …

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Spectroscopic Analysis Of Dna Strands Influenced By Magnetic Field / Seyedeh Maryam Banihashemian, Seyedeh Maryam Banihashemian Jan 2014

Spectroscopic Analysis Of Dna Strands Influenced By Magnetic Field / Seyedeh Maryam Banihashemian, Seyedeh Maryam Banihashemian

Student Works (2010-2019)

In recent years, the number of research related to biological sensing devices has increased tremendously. Investigations related to environmental effects on DNA involve multidisciplinary studies and are actively pursued due to its novelty. Studies on the behavior of some optical parameters of DNA under the influence of external magnetic field are therefore very interesting as it can lead to important applications in the biomedical field and electronics. These studies have been made possible with the availability and practicability of many highend optical measurement systems, which are currently available. In this work, spectroscopic characterizations on diluted DNA under external magnetic field …

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Rheological Evaluation Of Chitonated Fatty Acid Liposome In Carbohydrate-Based Gel / Tan Hsiao Wei, Hsiao Wei Tan Jan 2014

Rheological Evaluation Of Chitonated Fatty Acid Liposome In Carbohydrate-Based Gel / Tan Hsiao Wei, Hsiao Wei Tan

Student Works (2010-2019)

Liposome in gel preparation has opened up a new dimension in pharmaceutical formulation especially topical application as gels usually have longer contact time with the skin. In this study, the liposomal gel was prepared by mixing surface modified oleic acid (OA) liposomes into a carbohydrate based gel. The surface of oleic acid liposomes was modified using different molecular weight of chitosan (Ch1 and Ch2) and Npalmitoyl chitosan with different degree of acylation (Ch2P1 and Ch2P2) thereby providing a cloak structure on the surface of the liposomes. The surface modification of the OA liposomes by the Chs (Ch1 and Ch2) and …

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Purification And Characterization Of Isoforms Of Glutathione S-Transferase (Gst) From Acinetobacter Calcoaceticus Y1 / Chee Chin Soon, Chin Soon Chee Jan 2014

Purification And Characterization Of Isoforms Of Glutathione S-Transferase (Gst) From Acinetobacter Calcoaceticus Y1 / Chee Chin Soon, Chin Soon Chee

Student Works (2010-2019)

Bacteria were isolated from chemically-contaminated soil and the isolates were screened for glutathione S-transferase (GST) expression by spraying with monochlorobimane. The isolate with the most promising GST activity was later identified as Acinetobacter calcoacticus Y1 based on its 16S rRNA gene sequence. By using affinity chromatography, A. calcoaceticus Y1 putative GST (AcGST) was successfully purified and expressed GST subunit with molecular weight estimated at 23 kDa when analysed on sodium dodecyl sulphate polyacrylamide gel electrophoresis (SDS-PAGE). The purified protein was then further analysed by using two-dimensional electrophoresis where two putative GST isozymes were identified and designated as AcGST-1 and AcGST-2. …

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Determination Of Alcohol In Postmortem Blood Samples Using Automated Headspace Gas Chromatography – Mass Spectrometry / Saravanakumar Maniam, Saravanakumar Maniam Jan 2014

Determination Of Alcohol In Postmortem Blood Samples Using Automated Headspace Gas Chromatography – Mass Spectrometry / Saravanakumar Maniam, Saravanakumar Maniam

Student Works (2010-2019)

Determination of ethanol in post mortem blood has become one of the important tool in medico legal investigation. The concentration of the ethanol upon dead in a person or alive has legal complication if it is more than permitted level. In Malaysia the level of Blood Alcohol Concentration (BAC) permittable according Road Traffic Act 1987 is 0.08g/100ml of blood. Nonetheless the determination of ethanol concentration in fresh blood obtained from alcohol consumer post no significant problem whereas when the blood is obtained from dead person or post-mortem blood it validity is in questioned. Accurate interpretation of blood ethanol concentration at …

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Petrology And Geochemistry Of The Langkawi Granites / Kyaw Kyaw Nyein, Kyaw Nyein Kyaw Jan 2014

Petrology And Geochemistry Of The Langkawi Granites / Kyaw Kyaw Nyein, Kyaw Nyein Kyaw

Student Works (2010-2019)

The Langkawi Islands comprises a group of 99 tropical islands lying off the northwest coast of Peninsular Malaysia. The Langkawi granite makes about 40 % of the Langkawi. It can be divided into two main bodies: Gunung Raya and Kuah granites. The Gunung Raya biotite granite shows very coarse- to medium-grained texture, some are strongly porphyritic with K-feldspar phenocrysts reaching 6 cm in length whereas the Kuah granite consists of highly evolved fine- to medium-grained tourmaline granite. Tourmaline occurs in both Gunung Raya and Kuah granite. The tourmalinization is clearly observed in the Kuah granite. Geochemically, the Kuah granite (75.1-77 …

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Fungal Suppressive Activities Of Selected Rhizospheric Streptomyces Spp. Isolated From Hylocereus Polyrhizus / Kamalanathan Ramachandaran, Kamalanathan Ramachandaran Jan 2014

Fungal Suppressive Activities Of Selected Rhizospheric Streptomyces Spp. Isolated From Hylocereus Polyrhizus / Kamalanathan Ramachandaran, Kamalanathan Ramachandaran

Student Works (2010-2019)

Actinomycetes, mainly Streptomyces spp., have been extensively studied as potential biocontrol agents against plant pathogenic fungi. This study was aimed at isolating and screening Streptomyces strains from rhizosphere soils of Hylocereus polyrhizus collected in Kuala Pilah for potential in vitro antifungal activity. A total of 162 putative strains of actinomycetes was isolated from moist-heat treated soil plated on starchcasein-nitrate agar, humic-acid-vitamin agar and raffinose-histidine agar. Based on the ability to produce abundant aerial mycelium, 110 strains were categorised as Streptomycete-like. Seven main groups based on aerial mycelium colour observed in this study were grey (41.4%), white (37.7%), brown (8.0%), orange …

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Synthesis And Antioxidant Properties Of Some New Di-Tert-Butylphenol Derivatives Bearing Heterocyclic Ring / Raied Mustafa Shakir, Raied Mustafa Shakir Jan 2014

Synthesis And Antioxidant Properties Of Some New Di-Tert-Butylphenol Derivatives Bearing Heterocyclic Ring / Raied Mustafa Shakir, Raied Mustafa Shakir

Student Works (2010-2019)

The hindered phenolic compounds are known as one of the important antioxidants. Eleven new derivatives of aryl 1,3,4-oxadiazoles containing 2,6-di-tert-butylphenol were synthesized to increase the antioxidant ability. These oxadiazoles (coded as 2.12-2.22) were synthesized through the condensation of different aryl hydrazides with 3,5-di-tert-butyl-4-hydroxybenzoic acid in the presence of POCl3 as a dehydrating agent. The DPPH and FRAP assays showed that the antioxidant ability of these compounds depends on the type of substituents and their position in the phenyl ring. The sequence of substituents in order of their antioxidant activity are found to be 4-OH > 2-Me > 2,4-di-Me > 4-Me > OMe ≈ OEt …

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On The Skewness Of Graphs / Sim Kai An, Kai An Sim Jan 2014

On The Skewness Of Graphs / Sim Kai An, Kai An Sim

Student Works (2010-2019)

Let G be a graph. The crossing number of G, denoted as cr(G), is the minimum number of crossings of its edges among all drawings of G in the plane. The skewness of a graph G, denoted as sk(G), is the minimum number of edges in G whose deletion results in a planar graph. In Chapter 1 of this thesis, some preliminaries and de�nitions concerning graphs are given. In Chapter 2, we present some known results on crossing numbers of graphs and also a planarity criterion for a graph. In Chapter 3, we provide a survey on skewness of graphs …

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Fish And Trophic Connectivity Across Coral Reef And Mangrove Habitats Of North Eastern Langkawi Island, Peninsular Malaysia / Lau Chai Ming, Chai Ming Lau Jan 2014

Fish And Trophic Connectivity Across Coral Reef And Mangrove Habitats Of North Eastern Langkawi Island, Peninsular Malaysia / Lau Chai Ming, Chai Ming Lau

Student Works (2010-2019)

The presence of disparate biotopes of coral reefs and mangroves in one general area is unique. These biotopes may form ecologically connected ecosystems when occurring in close proximity such as in tropical Langkawi Island, Malaysia. Connected marine biotopes can provide various ecological services to fish community such as nursery, feeding habitats and shelter. As such, this study aims to test two hypotheses regarding Langkawi’s coral reefs and mangroves 1) the biotopes are ecologically connected via habitat utilization by the fish fauna and 2) the biotopes are ecologically connected via trophic energy pathways. Gill nets and fish pots were deployed to …

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Fraud Detection In Telecommunication Using Pattern Recognition Method / Mohd Izhan Mohd Yusoff, Mohd Izhan Mohd Yusoff Jan 2014

Fraud Detection In Telecommunication Using Pattern Recognition Method / Mohd Izhan Mohd Yusoff, Mohd Izhan Mohd Yusoff

Student Works (2010-2019)

Fraud activities have reached to critical point causing millions of ringgit of losses to telecommunication companies, and as a result, forcing them to employ applications or systems (such as Telekom Malaysia Berhad’s Next Generation Fraud Detection System) to detect the said activities. We introduce a new algorithm that could detect fraud activities in telecommunication industry (e.g. intrusion fraud which occurs when legitimate account is comprised by an intruder who makes or sells calls on this account) that uses Gaussian Mixed Model (or GMM), a probabilistic model normally used in fraud detection via speech recognition. Due to the complexity of GMM, …

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Revision Of Codonoboea Sect. Boeopsis And Sect. Salicini (Gesneriaceae) In Peninsular Malaysia / Lim Chung Lu, Chung Lu Lim Jan 2014

Revision Of Codonoboea Sect. Boeopsis And Sect. Salicini (Gesneriaceae) In Peninsular Malaysia / Lim Chung Lu, Chung Lu Lim

Student Works (2010-2019)

Peninsular Malaysia is the centre of diversity of the genus Codonoboea Ridl. with 74 species recorded. In this study, species from sect. Boeopsis (11 spp.) and sect. Salicini (4 spp.) are studied. There are four objectives in this study, namely to provide detailed descriptions of species and a key to species of both sect. Boeopsis and sect. Salicini. Secondly, to produce distribution maps and assess conservation status of the species. Then thirdly, to determine whether all species with pollen flowers in Codonoboea are monophyletic using morphology and molecular phylogenetic data. And fourth and lastly, to determine the trend of evolution …

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Separation Of Metallic And Semiconducting Single Walled Carbon Nanotubes Using Aqueous Two-Phase Technique / Malcolm Tang Siong Yii, Siong Yii Malcolm Tang Jan 2014

Separation Of Metallic And Semiconducting Single Walled Carbon Nanotubes Using Aqueous Two-Phase Technique / Malcolm Tang Siong Yii, Siong Yii Malcolm Tang

Student Works (2010-2019)

The presence of metallic single-walled carbon nanotubes (M-SWCNT) in as-prepared single-walled carbon nanotubes (SWCNT) poses a significant hurdle to integrate carbon nanotubes into semiconductor electronics. Here the findings of enriching semiconducting single-walled carbon nanotubes (S-SWCNT) using an aqueous two-phase system (ATPS) is reported. The solution containing as received SWCNT and polyethylene glycol (PEG), dextran, N-methylpyrrolidone (NMP) and water effectively separates into two distinct phases, with S-SWNT dominant in one phase while the M-SWCNT congregates in another phase. The separation process is due to the attraction of amine and S-SWCNT as reported by Chattopadhyay. Micro-Raman spectroscopy and Ultraviolet-Visible spectroscopy results show …

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Establishment Of A Real Time Rt-Pcr Assay To Detect Expression Of Selected Genes From Multiple-Drug Resistant Acinetobacter Baumannii / Sanaz Koosha, Sanaz Koosha Jan 2014

Establishment Of A Real Time Rt-Pcr Assay To Detect Expression Of Selected Genes From Multiple-Drug Resistant Acinetobacter Baumannii / Sanaz Koosha, Sanaz Koosha

Student Works (2010-2019)

Acinetobacter baumannii has an important role in nosocomial infections. However, in addition to the respiratory infections caused by this bacterium it also causes other infections, such as, bacteremia, urinary tract infections, meningitis, eye and skin infections. Recently the antibiotic resistance of A. baumannii has increased in respect of almost all of the current antibiotics. The present study focuses on the expression of genes ABAYE0161 (hypothetical protein) and ABAYE3501 (general secretion pathway protein C) in the presence and absence of the antibiotic imipenem. These two genes were chosen from the previous studies concerning the effect of microgravity on the expression of …

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Evaluation Of Shake Flask And Bioreactor Systems On Cell Growth And Regeneration Of Musa Acuminata Cv. Berangan Cell Suspension Culture / Wendy Chin Yi Wen, Chin Yi Wen Wendy Jan 2014

Evaluation Of Shake Flask And Bioreactor Systems On Cell Growth And Regeneration Of Musa Acuminata Cv. Berangan Cell Suspension Culture / Wendy Chin Yi Wen, Chin Yi Wen Wendy

Student Works (2010-2019)

In this study, a semi automated cell suspension culture protocol for Musa acuminata cv. ‘Berangan’ using bioreactor has been established. Flower clusters at the positions of 8 to 10 were the most responsive (70 %) towards embryogenesis. After eight months of culture, embryogenic calli generated from male inflorescences were transferred to liquid suspension medium. Embryogenic cell suspension culture was successfully established after two months of culture in liquid M2 medium. Cell suspension cultures showed optimum cell growth when cultured in the M2 modified liquid medium containing 2 % sucrose with an initial inoculum density of 2 % settled cell volume …

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Metallothionein Gene Expression And Genotoxic Effects Of Heavy Metals On Oreochromis Sp. / Elani Laili Juhari, Juhari Elani Laili Jan 2014

Metallothionein Gene Expression And Genotoxic Effects Of Heavy Metals On Oreochromis Sp. / Elani Laili Juhari, Juhari Elani Laili

Student Works (2010-2019)

Metallothionein is a small, cysteine rich protein that aids in ion homeostasis in a cell. It binds naturally to zinc and also has the tendency to bind to other metals as well if present in the cell. This study was conducted in order to determine the effects of heavy metals exposure on metallothionein expression and other genotoxic effects on the tilapia fish as test subjects. Oreochromis sp. was chosen as the test subject because of the many advantages of its characteristics and it can be easily found in Malaysian rivers. Test subjects were exposed to two types of metals which …

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