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Articles 451 - 480 of 590
Full-Text Articles in Biotechnology
Studies On Fucoidan And Its Production From Vietnamese Brown Seaweeds, Minh Ly Bui, Quoc Buu Ngo, Duy Nhut Nguyen, Duc Thinh Pham, Thi Thanh Van Tran
Studies On Fucoidan And Its Production From Vietnamese Brown Seaweeds, Minh Ly Bui, Quoc Buu Ngo, Duy Nhut Nguyen, Duc Thinh Pham, Thi Thanh Van Tran
ASEAN Journal on Science and Technology for Development
Sulfated fucans are among the most widely studied of all the sulfated polysaccharides of plant origin that exhibit biological activities in mammalian systems. In this report fucoidans from some Vietnamese Sargassumspecies such as S.polycystum, S.oligocystum, S.mcclurei, S. Swartzii and denticaprum were extracted and fractionated on a DEAE-Sephadex A-25 column. On the basis of chemical and spectral analyses, the fucoidan fractions obtained were found to be the sulfated fucogalactans containing sulfate ester groups and uronic acid, and composed essentially of fucose and galactose, as well as a minor amount of other sugars. The polysaccharide fractions were tested for anticancer activity. The …
Medium Optimization For The Production Of Biomass By Cunninghamella Sp. 2a1 Using Response Surface Methodology, Sulaiman Siti Aminah, Hamid Aidil Abdul, Yusoff Wan Mohtar Wan
Medium Optimization For The Production Of Biomass By Cunninghamella Sp. 2a1 Using Response Surface Methodology, Sulaiman Siti Aminah, Hamid Aidil Abdul, Yusoff Wan Mohtar Wan
ASEAN Journal on Science and Technology for Development
A statistical design approach has been used to optimize the production of biomass byCunninghamellasp. 2A1, evaluated based on lipidless biomass. A 23full factorial centralcomposite design (CCD) was chosen to study the combined effects of three factors; ammoniumtartrate, peptone and glucose concentrations. The p-value for each factors was < 0.05 suggestingthat these factors have significant effect on the production of lipidless biomass. The productionis represented by a linear model with p-value < 0.0001. The optimized medium consists of 3.86g/l ammonium tartrate, 55.84 g/l glucose and 7.73 g/l peptone predicted 16.83 g/l lipidlessbiomass. Results from four replications based on the optimized medium produced 18.48 g/llipidless biomass, which are in close agreementwith the predicted value. The coefficient forglucose was the highest indicating it as the most significant factoraffecting lipidless biomassproduction.
Spot Welding Copper - 1% Cr Electrode Tips Produced Via Equal Chan Nel Angular Pressing, Hussain L.B., Aljuboury Ali A., Gebril M.A.M., Sharif Nurulakmal Moh
Spot Welding Copper - 1% Cr Electrode Tips Produced Via Equal Chan Nel Angular Pressing, Hussain L.B., Aljuboury Ali A., Gebril M.A.M., Sharif Nurulakmal Moh
ASEAN Journal on Science and Technology for Development
A sharp 120o Equal channel angular pressing (ECAP) was applied at room temperature to refine the grains sizes of pure copper and copper - 1% Chromium alloy for spot welding electrode tips application. Initially deformation behavior was investigated with the position using colorful plasticine as work piece followed by copper alloy. It was found the deformation at the central part of the work piece is heavily sheared than the outer part. Optical and Scanning electron microscopy were used to study the progress of grain refining under the influence of rotation and number of passes during pressing. The influence of elongated …
Suitability Of Sago Starch Blended With Acrylamide As An Additive On Handsheets Made From Recycled Pulp Fibers, Sin Yeng Wong, Tahir Paridah Md., Kang Chiang Liew
Suitability Of Sago Starch Blended With Acrylamide As An Additive On Handsheets Made From Recycled Pulp Fibers, Sin Yeng Wong, Tahir Paridah Md., Kang Chiang Liew
ASEAN Journal on Science and Technology for Development
This study was carried out to determine the suitability of sago starch blended with acrylamide as paper additive. Solutions of unmodified and blended sago starch with acrylamide, were prepared at 5% weight over volume (w/v) basis before the basic properties (i.e., pH, viscosity and solid content) were determined. Thestarches were thenused to coat on laboratory made handsheets from recycled pulps. Various effects were studied, namely, modification of sago starch, addition of different types of initiator and further curing at different temperatures. The incorporation of acrylamide into sago starch through blending signif icantly increased the pH and viscosity of the solutions. …
Microbial Degradation Of Endosulfan In Agricultural Soils, Ismail B.S., Enoma A.O.S.
Microbial Degradation Of Endosulfan In Agricultural Soils, Ismail B.S., Enoma A.O.S.
ASEAN Journal on Science and Technology for Development
A study of the degradation of endosulfan (6, 7, 8, 9, 10, 10-hexachloro – 1, 5, 5a, 6, 9, 9a –hexahydro – 6, 9- methano – 2, 4, 3 – benzodioxanthiepin 3 – oxide) in Malaysian sandy loam and clay soils was carried out using a radioisotopic technique under laboratory conditions. It was demonstrated that endosulfan possessed long half-lives of 433, 495 and 462 days in aerobic sandy loam, aerobic clay and anaerobic clay soils respectively. Endosulfan degrades faster in non-sterile than in sterile soils. This study indicates that microorganisms are involved in the degradation of endosulfan. In general, degradation …
Water-Soluble N -Substituted Chitosan Derivatives, Le Dung Ph., Thien D.T., Dong N.T., Nhi T.T.Y., An N.T.
Water-Soluble N -Substituted Chitosan Derivatives, Le Dung Ph., Thien D.T., Dong N.T., Nhi T.T.Y., An N.T.
ASEAN Journal on Science and Technology for Development
Many water-solubleN-substituted chitosan derivatives have been prepared having the typical -NH-CH2- linkage. Both the Michael reaction and alkylation with monochloroacetic acid at pH 8- 8.5 offer relatively simple ways for their synthesis.
Development Of Hole Recognition System From Step File, Tan C. F., Ismail N., Wong S.V., Sulaiman S., Osman M.R.
Development Of Hole Recognition System From Step File, Tan C. F., Ismail N., Wong S.V., Sulaiman S., Osman M.R.
ASEAN Journal on Science and Technology for Development
This paper describes the development of Hole Recognition System (HRS) for Computer-Aided Process Planning (CAPP) using a neutral data format produced by CAD system. The geometrical data of holes is retrieved from STandard for the Exchange of Product model data (STEP). Rule-based algorithm is used during recognising process. Current implementation of feature recognition is limited to simple hole feat ures. Test results are presented to demonstrate the capabilities of the feature recognition algorithm.
Marine Natural Products And Their Potential Application In The Future, Van Minh Chau, Van Kiem Phan, Hai Dang Nguyen
Marine Natural Products And Their Potential Application In The Future, Van Minh Chau, Van Kiem Phan, Hai Dang Nguyen
ASEAN Journal on Science and Technology for Development
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Black And White Lahar As Inorganic Support For The Immobilization Of Yeast Invertase, C. Sabularse Veronica, T. Tud Mayrene, Lacsamana Marivic S., Solivas Josefina L.
Black And White Lahar As Inorganic Support For The Immobilization Of Yeast Invertase, C. Sabularse Veronica, T. Tud Mayrene, Lacsamana Marivic S., Solivas Josefina L.
ASEAN Journal on Science and Technology for Development
Volcanic ejecta or lahar can serve as an inorganic support for the immobilization of invertase. Pampanga and Bicol lahar samples were pretreated by ignition at 550oC for 5 hrs followed by concentrated hydrochloric acid treatment, activatedby reaction with aminopropyltriethoxysilane (APTS) and then covalently bound to invertase using glutaraldehyde as linker. Chemical tests confirmed the attachment of APTS to lahar and glutaraldehyde to silanized lahar. The quantity of immobilized invertase on Pampanga white, Pampanga black and Bicol black lahar were 98.73%, 96.73% and 84.27%,respectively. Conditions for maximum activity of invertase immobilized on Pampanga white lahar were pH 3.5, 45oC and 0.3 …
Recycled Pet For Rice Husk/Polyester Composites, Ahmad I., Abu Bakar D. R., Mokhilas S. N., Ramli A
Recycled Pet For Rice Husk/Polyester Composites, Ahmad I., Abu Bakar D. R., Mokhilas S. N., Ramli A
ASEAN Journal on Science and Technology for Development
Rice husks were combined with unsaturated polyester resin, synthesized from glycolysed product of poly (ethylene terephthalate) (PET) waste to form rice husk (RH)/polyester composites. PET from post-consumer soft drink bottles was recycled through glycolysis, followed by polyesterified with maleic anhydride and then cross-linked with styrene to producea formulation for the resin. Characterizations of the synthesized resin were performed byhydroxyl, acid values and Fourier Transform InfraRed (FTIR) techniques. The effect of filler loading and surface modification of rice husks on the mechanical properties of the composites were also investigated. It has been observed that the increasing filler loading resulted in reduction …
The Effects Of Palmvitee On Human Nasal Septal Chondrocytes Culture Expansion And Cartilage Reconstruction, Ruszymah B.H.I., Aminuddin B.S., Gapor A., Fuzina H.
The Effects Of Palmvitee On Human Nasal Septal Chondrocytes Culture Expansion And Cartilage Reconstruction, Ruszymah B.H.I., Aminuddin B.S., Gapor A., Fuzina H.
ASEAN Journal on Science and Technology for Development
Palmvitee may act as a beneficial supplement to cartilage tissue engineering which is currently still has certain limitation on chondrocyte expansion and dedifferentiation. Our objectives in thisstudy were to evaluate the effects of Palmvitee on the growth kinetic and phenotype gene expression of human nasal septal chondrocytesin monolayer expansion as well as cartilage reconstruction via tissue engineering technology. Human chondrocytes were cultured inmediums containing various Palmvitee concentrations. Among the different test groups, the medium containing Palmvitee at 3 μg/ml supported the highest chondrocyte growth rate. The gene expression in monolayer chondrocytes culture supplemented with 3 μg/ml Palmviteedemonstrated similar results as …
On The Dense Families In The Relational Datamodel, Duc Thy Vu, Son Nguyen Hoang
On The Dense Families In The Relational Datamodel, Duc Thy Vu, Son Nguyen Hoang
ASEAN Journal on Science and Technology for Development
In this paper, dense families of relation schemes are introduced. We characterize minimal keys of relation schemes in terms of dense families. Note that, the dense families of database relations were introduced by Jarvinen [6]. We prove that the set of all minimal keys of a relation scheme s= (U, F) is the transversal hypergraphs of a hypergraph D– {∅}, where Dis any s-dense family. We give a necessary and sufficient condition for an abitrary family to be s-dense family. We also present some dense families of relation schemes. Furthermore, in this paper, we also study antikeys by means of …
Photocatalytic Removal Of Tr I- And Hexa-Valent Chromium Ions From Chrome-Electropl Ating Wastewater, Kajitvichyanukul Puangrat, Changul Chulaluck
Photocatalytic Removal Of Tr I- And Hexa-Valent Chromium Ions From Chrome-Electropl Ating Wastewater, Kajitvichyanukul Puangrat, Changul Chulaluck
ASEAN Journal on Science and Technology for Development
A novel technique based on photocatalysis was applied to eliminate chromium ions, a toxic hazardous environmental pollutant. The photoreduction of each species of chromium (total, hexavalent, and trivalent chromiums) from chrome-electroplating wastewater was investigated using a titanium dioxide suspension under irradiation by a low-pressure mercury lamp. The initial concentration of total chromium was 300 mg/l. The applied conditions were the direct photocatalytic reduction process at pH 3.65 and the indirect photocatalytic reduction with added hole scavengers at the same solution pH. Results from both processes were comparatively discussed. Result show that chromium was not efficiently removed by direct photoreduction. In …
Book Review, Man In The Mangroves: The Socio Economic Situation Of Human Settlements In Mangrove Forest, Soegiarto Aprilani
Book Review, Man In The Mangroves: The Socio Economic Situation Of Human Settlements In Mangrove Forest, Soegiarto Aprilani
ASEAN Journal on Science and Technology for Development
Book Review, Man in the Mangroves: The Socio Economic Situation of Human Settlements in Mangrove Forest
System Enginering - Is It Relevant To Brunei, Ginige A, Knight J. A
System Enginering - Is It Relevant To Brunei, Ginige A, Knight J. A
ASEAN Journal on Science and Technology for Development
System Enginering - Is IT Relevant to Brunei
Pv Power System Component Characterization And System Simulation, Lasnier F, Ang T.G, Wang Y. J, Hemasuk T
Pv Power System Component Characterization And System Simulation, Lasnier F, Ang T.G, Wang Y. J, Hemasuk T
ASEAN Journal on Science and Technology for Development
PV Power System Component Characterization and System Simulation
Microbial Halogenation With Specific Reference To Chiloroperoxidase, Smith D.C, Bult A. T, Holt G, Christy C, Lilly M. D, Rice C
Microbial Halogenation With Specific Reference To Chiloroperoxidase, Smith D.C, Bult A. T, Holt G, Christy C, Lilly M. D, Rice C
ASEAN Journal on Science and Technology for Development
Microbial Halogenation With Specific Reference to Chiloroperoxidase
Biogas Plants With Plastic Film Gasholder, Tentscher W
Biogas Plants With Plastic Film Gasholder, Tentscher W
ASEAN Journal on Science and Technology for Development
Biogas Plants With Plastic Film Gasholder
Optical Properties And Aging Characteristics Of Blackchrme Surface On Different Textures Of Aluminium Substrates, Trakulcoo Kanchana, Niemsorn Saowanee, Pitaksenpanich Patcharee
Optical Properties And Aging Characteristics Of Blackchrme Surface On Different Textures Of Aluminium Substrates, Trakulcoo Kanchana, Niemsorn Saowanee, Pitaksenpanich Patcharee
ASEAN Journal on Science and Technology for Development
Optical Properties and Aging Characteristics of Blackchrme Surface on Different Textures of Aluminium Substrates
Employment Situation In Manufacturing Industry In Asean: A Few Issues, Chandra M, Satpute Chhaya
Employment Situation In Manufacturing Industry In Asean: A Few Issues, Chandra M, Satpute Chhaya
ASEAN Journal on Science and Technology for Development
Employment Situation in Manufacturing Industry in Asean: A Few Issues
Energy Model Of Grain Drying System, Soponronnarit Somchart
Energy Model Of Grain Drying System, Soponronnarit Somchart
ASEAN Journal on Science and Technology for Development
Energy Model of Grain Drying System
Introduction Of Cosmid Phu 52 Into Hup Azospirillum Sp. Bss 8 By Transconjugation And Transformation, Mamaril Juanita C, Ko Elizabeth P, Trinidad Lorele C.
Introduction Of Cosmid Phu 52 Into Hup Azospirillum Sp. Bss 8 By Transconjugation And Transformation, Mamaril Juanita C, Ko Elizabeth P, Trinidad Lorele C.
ASEAN Journal on Science and Technology for Development
Introduction of Cosmid pHU 52 Into HUP Azospirillum SP. BSs 8 BY Transconjugation and Transformation
An Operational System For Mapping Global Solar Radiation From Gms Satellite Data, Sorapipatana Chumnong, Exell R.H.B
An Operational System For Mapping Global Solar Radiation From Gms Satellite Data, Sorapipatana Chumnong, Exell R.H.B
ASEAN Journal on Science and Technology for Development
An Operational System For Mapping Global Solar Radiation From GMS Satellite Data
Accelerated Corrorion Testing: Salt Spry Test, Trakulcoo Kanchana
Accelerated Corrorion Testing: Salt Spry Test, Trakulcoo Kanchana
ASEAN Journal on Science and Technology for Development
Accelerated Corrorion Testing: Salt Spry Test
Crossflow Ultrafiltration For Removing Direct-15 Dye From Wastewater Of Textile Industry, Ahmad A.L., Puasa S.W., Abiding S.
Crossflow Ultrafiltration For Removing Direct-15 Dye From Wastewater Of Textile Industry, Ahmad A.L., Puasa S.W., Abiding S.
ASEAN Journal on Science and Technology for Development
Ultrafiltration membrane was used to treat the effluent from textile industries. Crossflow ultrafiltration using GN polymeric membrane was used to remove the dye from textile effluent. A synthetic textile effluent of Direct-15 dye was used. The study focused through the effect of feed concentration, transmembrane pressure and solution’s pH on the permeate flux and percentage of dye removal were investigated. Dye concentration had significant effects on flux values. Under the fixed pressures and pH, the flux decreased while the dye rejection increased with increasing feed concentration. Transmembrane pressure also had significant effect on flux values. Under the fixed feed concentration …
Timing Synchronization For Mc-Cdma Systems Using A Time-Multiplexed Synchronization Channel, Ky Pham Hong, Long Nguyen Duc
Timing Synchronization For Mc-Cdma Systems Using A Time-Multiplexed Synchronization Channel, Ky Pham Hong, Long Nguyen Duc
ASEAN Journal on Science and Technology for Development
In this paper, we present a synchronization algorithm for Multi-Carrier CDMA (MC-CDMA) systems using a time-multiplexed synchronization channel. The simulations results show that a system using proposed algorithm has much higher timing detection probability than using other algorithms, especially in exponential decay multipath fading.
Status And Potential Of Co - Generation In Thai Rice Mills, Chantramonklasri Nit, Wibulswas Prida
Status And Potential Of Co - Generation In Thai Rice Mills, Chantramonklasri Nit, Wibulswas Prida
ASEAN Journal on Science and Technology for Development
Status and Potential of Co - Generation in Thai Rice Mills
Effectiveness Of Selected Entomopathogenic Fungi In Packed Rice Grain At Room Temperature Against Corcyra Cephalonica Stainton, Samodra Hendrawan, Ibrahim Yusof Bin
Effectiveness Of Selected Entomopathogenic Fungi In Packed Rice Grain At Room Temperature Against Corcyra Cephalonica Stainton, Samodra Hendrawan, Ibrahim Yusof Bin
ASEAN Journal on Science and Technology for Development
Eight isolates of entomopathogenic fungi were evaluated as dried conidia against the rice moth, Corcyra cephalonica. In bioassays two isolates of Beauveria bassiana (BbGc and BbPs) and one isolate of Metarhizium anisopliae (MaPs) consistently gave high mortality to C. cephalonica larvae. Formulations in either kaolin, talc or tapioca flour (20 % w/w a.i.) thoroughly mixed with long grain rice in plastic cups (8 cm diameter by 5 cm) gave complete larval mortality by the 12th day of treatment. However, in general those formulated in kaolin and talc were more efficacious and faster to kill compared to those formulated in tapioca …
Optical Resonance Of A Three-Level System In Semiconductor Quantum Dots, Hieu Nguyen Van, Ha Nguyen Bich
Optical Resonance Of A Three-Level System In Semiconductor Quantum Dots, Hieu Nguyen Van, Ha Nguyen Bich
ASEAN Journal on Science and Technology for Development
The optical resonance of a three-level system of the strongly correlated electrons in the twolevel semiconductor quantum dot interacting with the linearly polarized monochromatic electromagnetic radiation is studied. With the application of the Green function method the expressions of the state vectors and the energies of the stationary states of the system in the regime of the optical resonance are derived. The Rabi oscillations of the electron populations at different levels as well as the Rabi splitting of the peaks in the photon emission spectra are investigated.PACS numbers: 71.35.-y, 78.55.-m, 78.67.Hc
Effects Of Habitat Fragmentation On Genetic Diversity In Cycas Balansae (Cycadaceae), Tam Nguyen Minh, Trang Nguyen T. Phuong, Giang Vu T. Ha, Triest L. Triest
Effects Of Habitat Fragmentation On Genetic Diversity In Cycas Balansae (Cycadaceae), Tam Nguyen Minh, Trang Nguyen T. Phuong, Giang Vu T. Ha, Triest L. Triest
ASEAN Journal on Science and Technology for Development
Habitat fragmentation is a serious threat to species survival. In Vietnam, Cycas balansae has been considered as threatened species because of the reduction and fragmentation of its habitats and over-exploitation. We assessed genetic variability and the pattern of population structure among six populations sampled in four provinces: Hoa Binh, Ha Nam, Ninh Binh and Quang Ninh. Polyacrylamide gel electrophoresis was performed on leaf tissues from 152 individuals representing 6 populations of C. balansae. Six of twelve enzyme systems were used to estimate genetic diversity at population and species levels. Eleven loci were examined. The allozyme data showed high levels of …