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Articles 1741 - 1770 of 3194

Full-Text Articles in Biotechnology

Direct Synthesis Of Ladder Wave Digital Filters With Tunable Parameters, Samad S.A. Dec 2017

Direct Synthesis Of Ladder Wave Digital Filters With Tunable Parameters, Samad S.A.

ASEAN Journal on Science and Technology for Development

This paper proposes a method for the synthesis of ladder wave digital filters (WDFs) directly from the digital domain. This method avoids the need for the synthesis of analog reference filters conventionally required in WDF design. This direct method allows for the determination of the WDF coefficients from the digital domain transfer function. This is similar to conventional infinite impulse response (IIR) filter coefficient determination but the WDF will give a more efficient realization. Due to the WDFs power complementary properties, a first-order ladder WDF can simultaneously realize both lowpass and highpass responses using the same structure, while a second-order …

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Immobilization Of Invertase On Carboxymethylcellulose Prepared From Nata De Coco For The Inversion Of Sucrose, Fundador E.O.V., Fundador V.C. Sabularse, Revilleza M.A.J.R. Dec 2017

Immobilization Of Invertase On Carboxymethylcellulose Prepared From Nata De Coco For The Inversion Of Sucrose, Fundador E.O.V., Fundador V.C. Sabularse, Revilleza M.A.J.R.

ASEAN Journal on Science and Technology for Development

Nata de coco, the cellulose produced by Acetobacter aceti with coconut water as substrate, was used as starting material in the synthesis of carboxymethylcellulose after treatment with NaOH and monochloroacetic acid. The product, referred to as carboxymethyl-“nata” (CMN), had a degree of substitution of 0.76, a higher value than those previously reported. This was used in the immobilization of invertase via ionic interaction and adsorptive forces, which produced a viscous colloidal suspension. Agar was incorporated to facilitate pellet formation. Interactions between the agar and the CMN-invertase may have resulted from ionic interactions as well as H-bonding. The immobilized enzyme retained …

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Stability And Stabilization Of Nonlinear Dynamical Systems, Sattayatham P., Saelim R., Sujitjorn S. Dec 2017

Stability And Stabilization Of Nonlinear Dynamical Systems, Sattayatham P., Saelim R., Sujitjorn S.

ASEAN Journal on Science and Technology for Development

Exponential and asymptotic stability for a class of nonlinear dynamical systems with uncertainties is investigated. Based on the stability of the nominal system, a class of bounded continuous feedback controllers is constructed. By such a class of controllers, the results guarantee exponential and asymptotic stability of uncertain nonlinear dynamical system. A numerical example is also given to demonstrate the use of the main result.

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Electrochemical Behavior Of Polycrystalline Copper During The Adsorption Of Co Abstract, Salimon J., Kalaji M. Dec 2017

Electrochemical Behavior Of Polycrystalline Copper During The Adsorption Of Co Abstract, Salimon J., Kalaji M.

ASEAN Journal on Science and Technology for Development

The electrochemical properties of electrode copper in carbon monoxide-saturated phosphate buffered solution were investigated. The electrochemistry of copper surface was sufficiently changed after the supporting electrolyte solution was saturated with CO. The hydrogen evolution region was depressed and shifted cathodically due to the adsorption process of CO on the copper surface in a linear or terminally bonded manner, Cu-CO . The oxidation and the reduction peaks of copper were significantly changed with two couple of redox peaks. This is due to the subsequent formation and the corresponding reduction of copper(I) and the copper carbon monoxides species. Further changed in electrochemical …

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Synthesis And Characterisation Of Hydroxyl-Terminated Liquid Natural Rubber By Photo-Fenton Reaction, Pham H. L., Do B. T., Pham T. S., Le D. G. Dec 2017

Synthesis And Characterisation Of Hydroxyl-Terminated Liquid Natural Rubber By Photo-Fenton Reaction, Pham H. L., Do B. T., Pham T. S., Le D. G.

ASEAN Journal on Science and Technology for Development

Hydroxyl-terminated liquid natural rubber (HTNR) was prepared by the photo-Fenton reaction, which was carried out in solution in the presence of H2O2/Fe(II) combined with UV irradiation. The HTNR obtained was characterized by GPC, FT-IR, 1H-NMR, 13C-NMR, DEPT-NMR spectroscopy as well as by chemical methods. A probable mechanism leading to the formation of HTNR was discussed based on the analytical data.

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A Preliminary Study: Comparative Toxicity Of Extracts From Tinospora Tuberculata Beumee And Lumnitzera Racemosa Willd On Aedes Aegypti Linnaeus Larvae (Diptera: Culicidae), Wahizatul A. A., Shasita R. Dec 2017

A Preliminary Study: Comparative Toxicity Of Extracts From Tinospora Tuberculata Beumee And Lumnitzera Racemosa Willd On Aedes Aegypti Linnaeus Larvae (Diptera: Culicidae), Wahizatul A. A., Shasita R.

ASEAN Journal on Science and Technology for Development

Research has been widely made on the potential use of herbal plants as effective agents for mosquito vector control. However, only a few studies have been carried out to investigate the potential insecticidal activity of mangrove plants against these dengue vectors. This study was carried out to examine the comparative toxicity of two mangrove plants, Tinospora tuberculata and Lumnitzera racemosa against the Aedes aegypti larvae. The leaf and stem of T. tuberculata and L. racemosa, were extracted using 95% methanol and these extracts bioassayed against the 3rd instar larvae of aegypti under laboratory conditions. The LC50 values of the crude …

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Toughening Of Bisphenol-A Diglycidyl Ether-Based Epoxy By Modification With Hydroxyl-Terminated Liquid Natural Rubber, Pham H. L., Do B. T., Pham T. S., Le D. G. Dec 2017

Toughening Of Bisphenol-A Diglycidyl Ether-Based Epoxy By Modification With Hydroxyl-Terminated Liquid Natural Rubber, Pham H. L., Do B. T., Pham T. S., Le D. G.

ASEAN Journal on Science and Technology for Development

Hydroxyl-terminated liquid natural rubbers (HTNRs), prepared by the Photo-Fenton reaction, were used to modify bisphenol-A diglycidyl ether-based epoxy (DGEBA). A chemical link between HTNRs and the epoxy resin was promoted employing toluene diisocyanate. The reactions between elastomers and epoxy resin were followed by FTIR. The mechanical properties of the composites were evaluated and the microstructure was investigated using scanning electronic microscopy. The results showed that the impact resistance of HTNR-modified DGEBA was superior to that of the pure epoxy resin. For the composites with HTNR, the impact resistance increased with elastomer concentration up to 2.5 parts per hundred parts of …

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Biodegradation Of Nr Latex-Based Materials Via A Carbon Dioxide Evolution Method, Shabinah F. M. S., Hashim M. Y. A. Dec 2017

Biodegradation Of Nr Latex-Based Materials Via A Carbon Dioxide Evolution Method, Shabinah F. M. S., Hashim M. Y. A.

ASEAN Journal on Science and Technology for Development

NR as a natural polymer has biodegradable characteristics and their existence was examined using CO2 evolution methods. The CO2 molecule produced by micro-organism metabolisms in the degradation system was quantified using a conventional acidimetric method. An aerobic system was determined as most suitable condition to be examined under this method. The presence of O2 in the system would help micro-organisms to destabilize the natural polymer. The material of LATZ, HA film and NR gloves showed significant weight loss and were able to produce CO2 evolution curves after 45 days in the biodegradation system compared to synthetic polyisoprene films. Gel permeation …

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Effects Of Chocolates Using Low Calorie Cocoa Butter Substitutes On Rat’S Plasma Profile And Determination Of Sn-1,3 Position, Ros-Haniza B.., Mamot S. Dec 2017

Effects Of Chocolates Using Low Calorie Cocoa Butter Substitutes On Rat’S Plasma Profile And Determination Of Sn-1,3 Position, Ros-Haniza B.., Mamot S.

ASEAN Journal on Science and Technology for Development

The present study sought to determine the effectiveness of newly developed low calorie chocolate using modified fat through enzymatic interesterification process as cocoa butter substitute of male Sprague Dawley rats (n = 35) compared to cocoa butter as control. Body weight gains did not differ significantly (p>0.05) in all the test groups fed with chocolates which were using different types of fats. Triacylglycerol and cholesterol test showed no significant difference (p>0.05) for all treatment samples. in this study, a pancreatic lipase hydrolysis was performed to determine the fatty acid composition of the sn-2 position of the structure lipids.

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Performance Appraisal Of Non-Governmental Organizations: A Discussion On Pakistan 2010 Floods Response And Recovery, Ali A., Baig N., Khan A. Dec 2017

Performance Appraisal Of Non-Governmental Organizations: A Discussion On Pakistan 2010 Floods Response And Recovery, Ali A., Baig N., Khan A.

ASEAN Journal on Science and Technology for Development

The paper examines in detail the role of NGOs (Non-governmental Organizations) in response and recovery phase of a disaster. Donors, INGOs (International Non-governmental Organizations) and NGOs work for the betterment of affected community but due to certain shortfalls, the community did not benefit as much as intended. In this research those gray areas are highlighted in detail through field visits and interaction with the community devastated by 2010 floods. Lack of inter-agency cooperation, partnership with inexperienced local NGOs and lack of transparency and accountability mechanisms are those areas which reduce the effectiveness of response and recovery efforts. These gray areas …

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Physical Fitness And Metabolic Profile Among Malay Undergraduates Of A Public University In Selangor Malaysia, Emad M., Kandiah M., Lim W. K., Barakatun-Nisak M. Y., Rahmat A., Norasruddin S., Appukutty M. Dec 2017

Physical Fitness And Metabolic Profile Among Malay Undergraduates Of A Public University In Selangor Malaysia, Emad M., Kandiah M., Lim W. K., Barakatun-Nisak M. Y., Rahmat A., Norasruddin S., Appukutty M.

ASEAN Journal on Science and Technology for Development

This study investigated health-related components of physical fitness consisting of morphological fitness (body fat % or BF %; Body Mass Index or BMI; and waist circumference or WC), metabolic fitness (blood glucose, lipid profiles and haemoglobin) and aerobic capacity (VO2max). This crosssectional study involved 324 undergraduates recruited voluntarily by systematic random sampling from a public university in the city Shah Alam, Selangor Malaysia. The respondents’ aerobic capacity was measured by field fitness tests and anthropometric measurements using standard protocols. The mean BMI of respondents was 22.51 ± 4.18 kg/m2, and majority of the respondents (93%) are within normal range of …

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Computational Fluid Dynamics Simulations Of Gas-Liquid Two-Phase Flow Characteristics Through A Vertical To Horizontal Right Angled Elbow, Aung N. Z., Yuwono T. Dec 2017

Computational Fluid Dynamics Simulations Of Gas-Liquid Two-Phase Flow Characteristics Through A Vertical To Horizontal Right Angled Elbow, Aung N. Z., Yuwono T.

ASEAN Journal on Science and Technology for Development

Having a clear understanding on the phase distribution of gas-liquid two-phase flow through elbow bends is vital in mixing and separation system designs. This paper presents the computational fluid dynamics (CFD) simulations and experimental observations of gas-liquid two-phase flow pattern characteristic through a vertical to horizontal right angled (90°) elbow. Experimental observations were conducted in a transparent test section that consisted of a vertical pipe, elbow bend and horizontal pipe with an inside diameter of 0.036 m. The CFD simulations were performed by using a computer software package, FLUENT 6.2. Bubbly flow conditions were created in the vertical test section …

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Factors Affecting Refrigerator-Freezers Energy Consumption, Saidur R. Saidur, Masjuki H.H., Mahlia T.M.I., Nasrudin A.R. Dec 2017

Factors Affecting Refrigerator-Freezers Energy Consumption, Saidur R. Saidur, Masjuki H.H., Mahlia T.M.I., Nasrudin A.R.

ASEAN Journal on Science and Technology for Development

Two frost-free household refrigerator-freezers, one with 492 liter capacity and one with 460 liter capacity were tested in the laboratory to determine the sensitivity of several variables those influence consumption refrigerator-freezers energy consumption greatly. The effects of single variables such as room temperature, thermostat setting positions, and door openings on the energy consumption were investigated. Using Response Surface Methodology (RSM), a mathematical model has been developed to investigate the combined effect of room temperature, thermostat setting positions, and door opening on the energy consumption of refrigerator-freezers. From the mathematical model, it has been observed that room-temperature has the highest effect …

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Giant Magnetoresistance (Gmr): Spinning From Research To Advanced Technology, Kok K.Y., Ng I.K. Dec 2017

Giant Magnetoresistance (Gmr): Spinning From Research To Advanced Technology, Kok K.Y., Ng I.K.

ASEAN Journal on Science and Technology for Development

In this paper, we aim to examine the research and development of materials demonstrating the giant magnetoresistance (GMR) property, a novel material property that has revolutionalised the advances of magnetic sensor and mass-memory technology today. A comprehensive outline for the fundamental materials aspects as well as the physics of the underlying mechanisms behind the GMR property is given. Recent development of GMR materials in data storage industry and other potential technological applications exploiting the GMR property are also discussed.

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Performance Of Membranes Crosslinked With Glutaraldehyde In Pervaporation Separation, Tan S.H., Ahmad A.L., Nawawi M.G. Mohd., Hassan H. Dec 2017

Performance Of Membranes Crosslinked With Glutaraldehyde In Pervaporation Separation, Tan S.H., Ahmad A.L., Nawawi M.G. Mohd., Hassan H.

ASEAN Journal on Science and Technology for Development

Chitosan membranes crosslinked with glutaraldehyde (GA) were prepared through a solution method, where the dry homogeneous chitosan membranes were immersed into the reaction solutions containing 1.25 x 10-3 wt. % of glutaraldehyde (GA). The extent of the crosslinking was controlled by varying the crosslinking time from 1 to 5 minutes. The prepared crosslinked membranes were used for pervaporation dehydration of isopropanol-water mixtures. The influence of feed composition on the separation characteristics has been investigated. The 2-minute-crosslinked-membrane yields the highest water concentrations in the permeate with moderate flux at 50 wt. % of isopropanol in the feed solution. The overall pervaporation …

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Using Crude Palm Oil (Cpo) As Diesel Engine Fuel, Lim T.H., Bari S., Yu C.W. Dec 2017

Using Crude Palm Oil (Cpo) As Diesel Engine Fuel, Lim T.H., Bari S., Yu C.W.

ASEAN Journal on Science and Technology for Development

In this study, heating was used to lower the viscosity of CPO to an acceptable level. 60°C was found to be the optimum heating temperature for CPO to ensure smooth flow in the fuel system, but heating further up to 100°C did not improve the engine performance. A comparison between CPO and diesel in terms of engine performance, combustion characteristics and emission showed that the brake specific fuel consumprion (bsfc) for CPO was 13% higher at 400 kPa brake mean effective pressure (bmep), and the highest bmep achieved was 13.5% lower. However, CPO fuel gave a brake thermal efficiency. Combustion …

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Catalytic Activity Of Zsm-5 Zeolite Loaded With Transition Metals For The Selective Catalytic Reduction Of Nox, Saaid I.M., Mohamed A.R., Bhatia S. Bhatia Dec 2017

Catalytic Activity Of Zsm-5 Zeolite Loaded With Transition Metals For The Selective Catalytic Reduction Of Nox, Saaid I.M., Mohamed A.R., Bhatia S. Bhatia

ASEAN Journal on Science and Technology for Development

Catalytic activity measurement were carried out on catalysts formulated from ZSM-5 zeolite separately loaded with transition metals (Cu, Co, Ni, Fe) for the removal of NOx in simulated diesel exhaust conditions. Various factors were investigated to compare the performance of these catalysts including catalyst preparation method, Si/Al ratio of the parent zeolite support, and durability in the exhaust stream containing water vapor or SO2. In many experimental conditions except in the presence of water vapor or SO2, Cu-ZSM5 remained the most active catalyst with 100% NOX conversion at around 350°C. C0-ZSM5 and Ni-ZSM5 could also achieve complete NOx conversion but …

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Using Two Time Scales Of Turbulence For Boundary Layer Flows, Saeid Nawaf H. Dec 2017

Using Two Time Scales Of Turbulence For Boundary Layer Flows, Saeid Nawaf H.

ASEAN Journal on Science and Technology for Development

A near wall improvement of the k-ε model of turbulence is proposed and evaluated. The present model takes into account the asymptotic behavior of turbulent scales near wall region and for free turbulence region. The Kolmogorov turbulent time scale is introduced as a lower limit. The model is used for prediction of turbulent boundary layer flows. Predictions compared with experimental data of several flow cases, with encouraging results.

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Design Of Robust H∞ Power System Stabilizer Using Normalized Coprime Factorization, Ngamroo I., Dechanupaprittha S. Dec 2017

Design Of Robust H∞ Power System Stabilizer Using Normalized Coprime Factorization, Ngamroo I., Dechanupaprittha S.

ASEAN Journal on Science and Technology for Development

This paper proposes a new design procedure of robust power system stabilizers (PSS) using H∞ control via normalized coprime factorization (NCF) approach. The design procedure of the proposed PSS is systematically described. Moreover, the selection method of the weighting function in H∞ control design is explained in a simple manner. The performance and robustness of the proposed PSS are investigated in comparison with the conventional PSS by examining the case of a single machine connected to an infinite bus (SMIB) system. The simulation results are illustrated to ensure the effectiveness of the proposed PSS.

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Electron Microscopy Of Entomopathogenic Fungal Invasion On The Cabbage-Heart Caterpillar Crocidolomia Binotalis Zeller (Lepidoptera: Pyralidae), Hashim N., Ibrahim Y.B., Tan Y.H. Dec 2017

Electron Microscopy Of Entomopathogenic Fungal Invasion On The Cabbage-Heart Caterpillar Crocidolomia Binotalis Zeller (Lepidoptera: Pyralidae), Hashim N., Ibrahim Y.B., Tan Y.H.

ASEAN Journal on Science and Technology for Development

The infection on Crocidolomia binotalis Zeller by the entomopathogenic fungi Paecilomyces fumosoroseus (Wise) Brown and Smith, Beauveria bassiana (Bals.) Vuill, and Metarhizium anisopliae var. majus (Metsch.) Sorokin was studied histopathologically using electron microscopy. Conidia which landed on the cuticle germinated within four to six hours. In the case of B. basiana, shortly after landing, an appresorium was formed that attached itself fast onto the cuticle at the point of fungal entry. The infected larva then entered the moribund state 12 to 24 hours after inoculation. Death of the larva followed 24 to 48 hours later. By then the body cavity …

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Narrowing The Digital Divide In Malaysia: Issues And Initiatives, Foo L.N., Lai W.K., Elamzazuthi C. Dec 2017

Narrowing The Digital Divide In Malaysia: Issues And Initiatives, Foo L.N., Lai W.K., Elamzazuthi C.

ASEAN Journal on Science and Technology for Development

Equity of and access to information and communication technologies (ICT) is currently a burning issue in many countries around the world. Malaysia, as a nation with about 22 million inhabitants, has taken some strong strides in recent times to bridge the access and equity gaps through appropriate policies and strategic national programmes. This paper will examine some of the key elements of several of these initiatives to bridge the digital divide in the country, in particular, the Titian Digital programme. We will also be identifying some of the major challenges that this programme hopes to resolve.

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Thermal Performance Prediction Of Plastics Ball Grid Array (Pbga) Using Artificial Neural Network, Leong C.H., Azid I.A., Seetharamu K.N. Dec 2017

Thermal Performance Prediction Of Plastics Ball Grid Array (Pbga) Using Artificial Neural Network, Leong C.H., Azid I.A., Seetharamu K.N.

ASEAN Journal on Science and Technology for Development

Artificial Neural Network (ANN) based on feed-forward backpropagation model is used to predict junction temperature in PBG A package. The limited results obtained from FEM (using IDEAS software) are used to train the neural network. The effect of source power, substrate and mold compound thermal conductivity, die size, substrate thickness and air velocity on junction temperature and thermal resistance has been investigated using ANN. The predicted junction temperature using ANN agrees closely with the prediction from FEM. ANN method takes a small fraction of the time and effort compared to that required by HEM for prediction.

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Fusion Decision For A Bimodal Biometric Verification System Using Support Vector Machine And Its Variations, Teoh A., Samad S.A., Hussain A. Dec 2017

Fusion Decision For A Bimodal Biometric Verification System Using Support Vector Machine And Its Variations, Teoh A., Samad S.A., Hussain A.

ASEAN Journal on Science and Technology for Development

This paw presents fusion detection technique comparisons based on support vector machine and its variations for a bimodal biometric verification system that makes use of face images and speech utterances. The system is essentially constructed by a face expert, a speech expert and a fusion decision module. Each individual expert has been optimized to operate in automatic mode and designed for security access application. Fusion decision schemes considered are linear, weighted Support Vector Machine (SVM) and linear SVM with quadratic transformation. The conditions tested include the balanced and unbalanced conditions between the two experts in order to obtain the optimum …

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Analysis Of Quality Costs For Statistica Quality Control Planning, Chiadamrong N., Thaviwatanachaikul C. Dec 2017

Analysis Of Quality Costs For Statistica Quality Control Planning, Chiadamrong N., Thaviwatanachaikul C.

ASEAN Journal on Science and Technology for Development

Quality has become one or the most important force leading to organizational success and company growth in national and international markets. The return-on-investment from strong and effective quality programs is providing excellent profitability results in firms with effective quality strategies. Due to the wide variation in quality results, the search for the genuine keys to success in quality has become a matter of deep concern to management of companies. This paper suggests a way to quantifying quality costs. As a result, the appropriate quality strategies can be adjusted and set to match with each company situation based on the categorization …

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A Sensitive Assay For Non-Specific N-Methyltransferase Activity In Rat Tissues By High-Performance Liquid Chromatography Electrochemical Detection, Shimbhu Dawan, Kojima Kohichi, Nagatsu Toshiharu Dec 2017

A Sensitive Assay For Non-Specific N-Methyltransferase Activity In Rat Tissues By High-Performance Liquid Chromatography Electrochemical Detection, Shimbhu Dawan, Kojima Kohichi, Nagatsu Toshiharu

ASEAN Journal on Science and Technology for Development

Phenylethanolamine N-methyltransferase (PNMT) and non-specific N -methyltransferase (EC 2.1.1.28) catalyze the N-methylation of aromatic amines. PNMT is specific for phenylethanolamines such as noradrenaline (NA). and catalyzes the step in catecholamine biosynthesis, forming adrenaline (AD) from NA. PNMT activity is high in adrenal gland, whereas non-specific N-methyltransferase is distributed in various tissues such as the lungs. Borchardt et al. first reported a method to detect PNMT activity by high-performance liquid chromatography electrochemical detection (HPLC-EICD), which could demonstrate the activity only in the adrenal medulla and hypothalamus. Recently, Troeewicz et al. reported a highly sensitive assay method for PNMT using HPLC-EICD by …

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Mitigating Co Emissions From The Power Sector: Least-Cost Analysis Of Policy Options In Thailand, Limmeechokchai Bundit, Tanatvan Somporn, Shrestha Ram M. Dec 2017

Mitigating Co Emissions From The Power Sector: Least-Cost Analysis Of Policy Options In Thailand, Limmeechokchai Bundit, Tanatvan Somporn, Shrestha Ram M.

ASEAN Journal on Science and Technology for Development

Traditionally, the method used in the electricity generation expansion planning has concentrated only on the supply-side options to identify the sequence of generation additions meet the forecasted demand at a minimum cost. Electricity generation expansion planning with both supply- and demand-side options, commonly known as integrated resource planning are also being used in some developed countries. With growing environmental concerns, especially the emission of air-pollutants from the power generation, demand-side management and clean and efficient generation technology options in the power sector development are getting increasing attention. In this paper, we compare the traditional planning approach with integrated resource planning. …

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Steady State Finite Element Analysis Of A Single Stack Cold Plate With Heat Losses, Quadir G. A., Bell Shiao Lin, Seetharamu K. N., Hassan A. Y. Dec 2017

Steady State Finite Element Analysis Of A Single Stack Cold Plate With Heat Losses, Quadir G. A., Bell Shiao Lin, Seetharamu K. N., Hassan A. Y.

ASEAN Journal on Science and Technology for Development

Steady state analysis of a single stack cold plate used for the cooling of electronic components is carried out using the finite element method. The present methodology takes into account the heat losses from the top and bottom surfaces of the stack. In addition dimensionless parameters are used in the analysis. The analysis is divided into two parts: a single unit cell analysis and the analysis of the assembly of several unit cells. The results from the present analysis of a single unit cell for single stack cold plate without heat losses compare well with those available in the literature. …

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Study Of Preparation And Characterization Of Hydroxyapatite Coatings By Sol-Gel Technique, Ramanan Sutapa Roy, Venkatesh Ramanan Dec 2017

Study Of Preparation And Characterization Of Hydroxyapatite Coatings By Sol-Gel Technique, Ramanan Sutapa Roy, Venkatesh Ramanan

ASEAN Journal on Science and Technology for Development

Hydroxyapåtite (HAP) coatings were prepared on glass substrates by sol-gel dip coating method, using a isopropanol solution of calcium nitrate and 2-butanol solution of phosphorous pentoxide as starting precursors and mixing them to get a coating solution with Ca/P ratio of 1.67. The prepared coatings were dried at 150°C and subsequently fired at 500°C to obtain dense coatings. Multilayer coatings were prepared to increase the final thickness. For some samples, SiO2, TiO2, Al2O, and Zr02 coatings modified the interface between the glass and HAP. X-ray diffraction, scanning electron microscopy, FTIR and DTA/TG were used for characterization. All the coatings obtained …

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Multiplikasi Tunas Mikro Pisang (Musa Paradisiaca L.) ‘Raja Bulu’ Secara In Vitro Pada Berbagai Jenis Dan Konsentrasi Sitokinin, Tiara Elma, Erni Suminar, Syariful Mubarok, Anne Nuraini Dec 2017

Multiplikasi Tunas Mikro Pisang (Musa Paradisiaca L.) ‘Raja Bulu’ Secara In Vitro Pada Berbagai Jenis Dan Konsentrasi Sitokinin, Tiara Elma, Erni Suminar, Syariful Mubarok, Anne Nuraini

Jurnal Kultivasi

Terbatasnya ketersediaan bibit pisang bermutu di Indonesia disebabkan oleh masih rendahnya jumlah dan kualitas bibit pisang yang dihasilkan melalui metode konvensional. Waktu yang dibutuhkan untuk mendapatkan bibit cukup lama, oleh karena itu digunakan suatu metode perbanyakan untuk menghasilkan bibit dalam waktu yang relatif singkat melalui metode kultur jaringan. Tujuan dari penelitian ini adalah untuk mendapatkan salah satu jenis dan konsentrasi sitokinin terbaik dalam meningkatkan laju multiplikasi tunas pisang raja bulu secara in vitro. Percobaan dilaksanakan dari bulan November 2016 sampai bulan Maret 2017 di Laboratorium Kultur Jaringan dan Teknologi Benih Fakultas Pertanian Universitas Padjadjaran di Jatinangor, Sumedang. Rancangan Acak Lengkap …

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Advanced Biotechnology Tools For Invasive Species Management, Invasive Species Advisory Committee Dec 2017

Advanced Biotechnology Tools For Invasive Species Management, Invasive Species Advisory Committee

National Invasive Species Council

Increasingly, genetic tools are being used to detect and solve pressing environmental, social, and health-related challenges. It is clear that investments in technology innovation can be game changing, as advances in biotechnology may provide new methods to protect the nation’s resources from the negative impacts of invasive species. The current toolbox of management options is recognizably insufficient to deal with many of the high-impact species that have been introduced. However, “surrendering” to these species is generally not a viable option from ecological, health, economic, socio-cultural, or political perspectives. Cost-efficient solutions to these “grand invasive species challenges” need to be found. …

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