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Welcome to Chiang Mai Journal of Science, an international journal for the publication of all preliminary communications in Science.
First launched in 1973 by Faculty of Science, Chiangmai University, CMJS is peer-reviewed and published as hardcopy and online open-access journal. It is indexed/abstracted in :
• Science Citation Index Expanded (SciResearch®)
• Journal Citation Reports/Science Edition
• SCOPUS
• SciFinder Scholar
• Chemical Abstracts
• Directory of Open-Access Journal (DOAJ)
• Google Scholar.
• Zoological Records |
Print ISSN: 0125-2526
Frequency: 4 issues/Year
ISI Journal Citation Reports® Ranking 2010: Multidisciplinary Sciences: 38/57
Impact Factor: 0.34 |
| Current Issue : Vol.38 No.4 (OCTOBER 2011) |
1. |
Editorial Board Changes Impact Factor 2010
Author: Robert Molloy
E-mail: robert@chiangmai.ac.th
(Page - )
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2. |
Associated Prime Submodules and Related Results
Author: Mohammad Javad Nikmehr, Reza Nikandish
E-mail: nikmehr@kntu.ac.ir
(Page 509 - 513)
Full Text | Abstract
The notions of associated and supported prime submodules, as a generalization of associated and supported prime ideals, have been introduced by Divaani-Aazar and Esmkhani. In this paper, we will try to develop this theory and give some relations between associated, supported, maximal and prime submodules. |
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3. |
Potentials for the Klein-Gordon and Dirac Equations
Author: Lalit K. Sharma, Pearson V. Luhanga and Samuel Chimidza
E-mail: sharmalk@mopipi.ub.bw
(Page 514 - 526)
Full Text | Abstract
A few solvable potentials for the Klein-Gordon equation have been evaluated by using various standard second order differential equations. Some solvable potentials for the Dirac equation have also been discussed. |
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4. |
Characteristics of BNZ Ceramic Prepared by Using Bismuth Oxide as Sintering AID
Author: Panupong Jaiban,Ampika Rachakom, Sukanda Jiansirisomboon and Anucha Watcharapasorn
E-mail: anucha@stanfordalumni.org
(Page 527 - 532)
Full Text | Abstract
In this study, characteristics of (Bi0.5Na0.5)ZrO3 ceramic by using bismuth oxide as a sintering aid at appropriate sintering temperature were investigated. Phase characteristic of BNZ powder was checked by X-ray diffraction technique. It was found that BNZ powder has orthorhombically distorted perovskite (ABO3) structure. After that, BNZ/ᵪBi2O3 powders with ᵪ = 0, 0.5, 1, 1.5 and 2 wt% were pressed and sintered at 900°C for 2 h. Their X-ray diffraction patterns revealed that all produced a single phase perovskite phase. Microdtructure was investigated by scanning electron microscopy. It could be seen that un-modified BNZ ceramic composed a minimum relative density value. However, its microstructure evolution and relative densities were enhanced with increasing of Bi2O3 content. |
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5. |
Stability of Vancomycin 31 mg/mL in Extemporaneous Eye Drops Determined with Capillary Electrophoresis
Author: Anutra Khangtragool, Sineenart Santidherakul and Phuriwat Leesawat
E-mail: akhangtr@med.cmu.ac.th
(Page 533 - 540)
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This study evaluates the stability of extemporaneous ophthalmic antibiotic preparations made from a commercially available injection of vancomycin of 31 mg/mL and stored at 2-8°C and 28°C for 3 months. After various storage times, the stability was determined by capillary electrophoresis. Solutions of vancomycin 31 mg/mL in Tear Naturale ПTM were found to be stable after storage at 2-8°C and 28°C for 28 days, respectively. Vancomycin 31 mg/mL in extemporaneous eye drops prepared and supplied by a pharmacy should be stored at 2-8°C for less than 28 days. |
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6. |
Comparison and Analysis of Remote Sensing-based and Ground-based Precipitation Data Over India
Author: Thitikon Chanyatham and Sukrit Kirtsaeng
E-mail: mrthitikorn@gmail.com
(Page 541 - 550)
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Accurate estimation of precipitation is crucial for yield assessment, flood and drought monitoring and water resources management. Rainfall consists of both temporal and spatial variability. Rain gauges support temporal resolution, on the other hand it is weakness in the quality of spatial resolution. However, remote sensing provides good spatial resolution. According to the advantages of these measurement methods, more precious rainfall data should be estimated from the combination of existent rain gauges and remote sensing observation. The pilot project is comparative study and analysis gridded rainfall products of Tropical Rainfall Measuring Mission (TRMM) 3B43 monthly, 3B42 3-hourly, Climate Prediction Center (CPC) and India Meteorological Department (IMD). The study areas are India region and Ganga basin, located in north-eastern of India. The methodology of comparison is carried out the gridded data sets to 0.5x0.5 degree. The rainfall data sets in 2005 were analyzed for all monthly products and rainfall data sets during 15 June to 15 September 2005 were analyzed for daily products. In the analysis, three statistical m measures are used: bias, root mean square difference and mean absolute difference for over India, each state of India. TRMM 3B42 and 3B43 products have higher bias, RMSD and MAD than CPC products. The accuracy of CPC, TRMM 3B43 monthly products and TRMM 3B42 3-hourly products are 83%, 76% and 69% respectively. States analysis show high bias of CPC, TRMM 3B42 and 3B43 products in Arunachal Pradesh and Mizoram that located in hilly area and have high rainfall rate. The rainfall estimated by remote sensing show lower rain rate ground-based data that may be the effect of temporal resolution of satellites, in monsoon season this effect is predominant. |
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7. |
Application of Horseradish Peroxidase Mediated Oxidative Coupling Reaction for the Determination of Mesalazine
Author: Shaik Shakeela, Bandakavi Sita Ram, Chandra Bala Sekaran
E-mail: balumphil@gmail.com
(Page 551 - 559)
Full Text | Abstract
This work reports three novel spectrophotometric methods for the determination of mesalazine in bulk and pharmaceutical dosage forms. The proposed methods are based on the oxidative coupling of mesalazine with orcinol (method A), resorcinol (method B) and cresol (method C) in the presence of hydrogen peroxide and horseradish peroxidase to produce a colored complex having absorption maxima at 490 nm, 470 nm and 480 nm, respectively. The Beer’s law is obeyed in the concentration range of 5-30 mg/ml of the drug for all the three methods. The methods were validated statistically and by recovery studies. The proposed methods are applied to marketed tablet formulations. The results obtained from tablet formulations compared well with those obtained by the official method and demonstrated good accuracy and precision.
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Comparative Analysis of Aqueous Extracts of Amaranth and Coriander in Scavenging Free Radical Activity and Protection of DNA against Oxidative Damage
Author: Asmita Dutta and Mukesh Singh
E-mail: singhmukesh8@rediffmail.com
(Page 560 - 571)
Full Text | Abstract
Green leafy vegetables are considered to be of immense therapeutic potential since ancient days. Amaranth (Amaranthus gangeticus) and coriander (Coriandrum sativum) are green leafy vegetables widely distributed across the world and most of which are consumed as daily diet. Present study was aimed to investigate the antioxidant potential of boiled aqueous extract of leaves of these green vegetables in terms of their total antioxidant capacity, free-radical scavenging using a, a-diphenyl-b-picryl hydrazyl (DPPH) and hematoxilin, anti-lipid peroxidation, metal chelating and ability to protect DNA against oxidative damage. Results of all the in vitro free-radical generating assays systems demonstrated positive scavenging efficiency for the extracts of both vegetables. The IC50 values for boiled aqueous extract revealed that DPPH radical scavenging ability were almost same for both the vegetables. The extract showed marked confirmed protective effect on calf thymus genomic DNA against oxidative damage and anti-lipid peroxidation activity against ferrous ions on goat liver homogenates. The extract of amaranth showed better anti-lipid peroxidation activity as compared to coriander extract. The optimum DNA protecting ability against free radical-induced damage was 250 mg and 350 mg for aqueous extracts of amaranth and coriander, respectively. The results, which suggest that amaranth and coriander have nutritive as well as medicinal values against free-radical-associated oxidative damage and related degenerative diseases involving metabolic stress, genotoxicity and cytotoxicity, highlight the importance of undertaking scientific studies of the commonly used vegetables with traditional claims of pharmaceutical significance. |
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9. |
Preparing Activated Carbon from Palm Shell for Biodiesel Fuel Production
Author: Achanai Buasri, Nattawut Chaiyut and Chaiwut Nakweang
E-mail: achanai130@gmail.com
(Page 572 - 278)
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Palm shell is a cheap and abundant agricultural by-product in many tropical countries, particularly Malaysia, Indonesia and Thailand. Several techniques including thermal activation (physical activation) and chemical activation have been successfully developed to convert palm shell into an activated carbon (AC). One technique is to use an activating agent such as Ca(NO3)2.4H2O. The objective of this work was to optimize the process for biodiesel fuel production from palm stearin using activated carbon supported calcium oxide. Transesterification of palm stearin with menthanol was investigated under a heterogeneous catalysis system. The reaction was studied by various amount of metal loading in activated carbon. The supported alkali earth metal catalysts, Ca(NO3)2/AC showed almost the same activity under the optimized reaction conditions compared to calcium oxide catalyst (CaO). The catalysts were characterized, using thermogravimetric analysis (TGA), scanning electron microscope (SEM), X-ray diffraction (XRD) and surface area analyzer. The results indicated that the Ca(NO3)2/AC had relatively low surface area, compared to CaO. The suitable conditions for heterogeneously catalyzed transesterification of Ca(NO3)2/AC and CaO were the menthanol/oil molar ratio of 20, temperature of 60°C and reaction time of 4 h, with 10.5 and 6% (w/w) catalyst to oil ratio for Ca(NO3)2/AC and CaO, respectively. |
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10. |
Effects of Packaging Types and Storage Temperatures on the Shelf Life of Fresh Rice Noodles under Vacumm Conditions
Author: Pornchai Rachtanapun and Thitima Tangnonthaphat
E-mail: p.rachta@chiangmai.ac.th
(Page 579 - 589)
Full Text | Abstract
The effects of packaging type and storage temperatures on the shelf life of fresh rice noodles were investigated. Fresh rice noodles were packed in four different packaging types; high density polyethylene (HDPE) wrap, high density polyethylene pouch, polyethylene terephthalate (PET) pouch and nylon pouch under vacuum condition and stored at 25°C. The shelf life of fresh rice noodles was determined by sensory evaluation for selecting the suitable packaging material. Microbiological properties and pH of samples in different packaging types were also investigated. The results showed that samples in the nylon pouch had the longest shelf life (13 days) compared to other packaging materials. Therefore, nylon pouches were chosen to study the effect of storage temperatures (4°C and 25°C) on the shelf life of fresh rice noodles under vacuum conditions. Microbiological and properties of these samples were determined. It was found that samples stored at 4°C gave a longer shelf life than that stored at 25°C. Low temperatures (4°C) could inhibit the growth of microbes and slow down the decrease in pH. However, the shelf life of fresh rice noodles was only 29 days due to retrogradation. |
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