- In vitro, Ex vitro Plantlet Development and Hybridity Confirmation of Dendrobium delacourii (Female) × D. venustum (Male)
Pantila Udorn (Department of Botany, Faculty of Science, Kasetsart University, THAILAND ), Kongkanda Chayamarit (The Forest Herbarium, Department of National Park, Wildlife and Plant Conservation, THAILAND ) , and Sureeya Tantiwiwat * (Department of Botany, Faculty of Science, Kasetsart University, THAILAND )
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Keywords: Supplementary media;
In vitro plantlet growth;
Orchid potting media;
Transplantation;
PCR-RAPD.
Abstract
In our previous study, we created a hybrid from a cross between Dendrobium delacourii and Dendrobium venustum, as well as presented appropriate germination conditions for the hybrid seed to yield a plantlet. Here, we confirm hybridity of Dendrobium delacourii × Dendrobium venustum using PCR-RAPD, and further investigate an appropriate medium for in vitro and subsequently ex vitro hybrid plantlet growth. The results show that in vitro hybrid plantlets grow well on ½MS medium supplemented with 8% banana homogenate. After transplantation, we found that chopped coconut husk is an appropriate ex vitro supporting material for this hybrid.
- Punching Shear Strengthening of RC Flat Plate with Ferrocement Drop Panel
Sayan Sirimontree *, Boonsap Witchayangkoon, and Krittiya Lertpocasombut (Department of Civil Engineering, Faculty of Engineering, Thammasat University, Rangsit Campus, Pathumtani 12121, THAILAND )
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Keywords: Ferro-cement; shear connector; composite action; strengthening material.
Abstract
Punching shear strengthening of reinforced concrete (RC) flat plate by adding drop panel around supported column is studied in this work. Ferro-cement is chosen as a strengthening material. Specimens with and without shear connector between slab and strengthening material were tested to study about composite action between existing concrete and ferro-cement materials. The results show significant improvement of punching shear strength of RC flat plate specimen strengthened by ferro-cement with shear connector. Fully composite action between slab and strengthening materials is achieved by providing adequate shear connector between existing concrete and ferro-cement materials. Slightly improvement of punching shear strength of strengthened specimen without shear connector and delamination of strengthening materials from slab at high load level (before failure load) were found from the experiment.
- Capsule Age and Morphological Changes of Embryo Development Influence Asymbiotic Hybrid Seed Germination of Dendrobium delacourii × Dendrobium venustum
Pantila Udorn (Department of Botany, Faculty of Science, Kasetsart University, THAILAND ), Kongkanda Chayamarit (The Forest Herbarium, Department of National Park, Wildlife and Plant Conservation, THAILAND ) , and Sureeya Tantiwiwat * (Department of Botany, Faculty of Science, Kasetsart University, THAILAND )
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Keywords: Hand pollination;
Hybridization;
In vitro culture;
Histological observation;
Paraffin technique
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Abstract
Dendrobium delacourii and Dendrobium venustum are epiphytic orchids that are conservative in Kok Phutaka, Amphoe Wiang Kao, Khon Kaen Province. Both species are floriferous and produce long-lasting flowers. A cross between these two species produces a hybrid that has potential for ornamental plant markets. This study aims to investigate an asymbiotic culture as a potential method to propagate this hybrid orchid. Medium type and capsule age were tested for possible effects on germination of the hybrid seed. Our results show that seeds from 120 days after pollination (DAP) had the highest percentage of seed germination and seed could develop to be the highest percentage of protocorm with leaf primodia when cultured on half-strength Murashige and Skoog (½MS) medium with 20% coconut water. A histological observation showed that embryo of the seeds from 120 DAP capsule was in a mature stage that was an appropriate pod age for seed germination.
- Livable City with Commuter Boat Services in Chao Phraya River
Boonsap Witchayangkoon *, Sayan Sirimontree, Krittiya Lertpocasombut (Department of Civil Engineering, Faculty of Engineering, Thammasat University, Rangsit Campus, Pathumtani 12121, THAILAND ) and Ahmad Sanusi Hassan (School of Housing, Building and Planning, Universiti Sains Malaysia (USM), MALAYSIA )
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Keywords: passenger’s satisfaction, questionnaire survey, transit boat, boatpool, Bangkok, Thailand.
Abstract
This work studies the passengers’ satisfaction of commuter boat services in Chao Phraya River, Bangkok, Thailand, in term of service by using questionnaire as a study tool. The questionnaire survey has 100 respondents from major piers including Nonthaburi, Maharaj, and Tha Chang. This study has 55 female respondents with the age ranges 36-45. Moreover, 43 percent of the respondents are not graduated while another 45 percent are graduated and the majority of passengers are employees and students who earn less than 15,000baht (US$450) per month. In term of passengers’ satisfaction toward the services, the results indicate that passengers are moderately satisfied to all aspects. The study finds that only the level of income has an effect on the passengers’ satisfaction. In overall, passengers moderately satisfied with every aspects of travelling by transit/commuter boat, still improvement is recommended for punctuality, and lifesaving facilities. Having more than forty thousand daily users, boatpool commuter services make Bangkok a livable city in aspects of efficient and sustainable public transportation issues.
- Identification of Maintainer and Restorer Lines for Three-Line Hybrid Rice System
Yaowamarn Keawsaard, Tanee Sreewongchai, and Prapa Sripichitt * (Department of Agronomy, Faculty of Agriculture, Kasetsart University, THAILAND )
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Keywords: maintainer line;
restorer line;
three-line hybrid rice system;
pollen sterility;
spikelet fertility.
Abstract
This study aimed to identify 21 rice varieties as maintainer and restorer lines for three-line hybrid rice system. Pollen and spikelet fertility of the F1 hybrids derived from the crosses between two A lines (IR80151A and CH1A) and the 21 rice varieties were determined and used as criteria to identify those varieties as maintainer and restorer lines. It was found that nine and three varieties tested were identified to be maintainer and restorer lines for the A line (IR80151A), respectively. Whereas only four varieties tested were classified to be maintainer lines for A line (CH1A). The three varieties involving SPR1, JHN and KOH1 were found to be maintainer lines for both A lines (IR80151A and CH1A). These varieties identified as maintainer and restorer lines will be employed to develop new adapted and promising A, B and R lines for three-line hybrid rice production.
- Green Building Technology for Public Restroom Conceptual Design via SketchUp®
Krittiya Lertpocasombut*, Sayan Sirimontree, Boonsap Witchayangkoon (Department of Civil Engineering, Faculty of Engineering, Thammasat University, Pathumtani, THAILAND )
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Keywords: cost estimation; environmental standard; public toilet design; sanitary ware; Thailand.
Abstract
This work applies green building technology to design public restroom. The SketchUp® program is used as a study platform. Criteria of the green label standard, green building for sanitary ware and public toilet standards are taken into account in designing a green restroom. Construction materials and sanitary wares have been selected with certified environmental standards. Then a conceptual design of green restroom with calculations of water and electricity usages within 5 years is compared to a public toilet under conventional design. The green designed restroom can save up to 80 % of water consumption. By using the environmental standard certified electric appliances, it could reduce the monthly expenses down to 60 %. The green restroom investment project which certified with green building toilet standard, it requires a construction estimated twice the cost of the conventional public toilet. This green restroom design will be rewarding after five years usage. Even though, the estimated cost of restroom with green building technology design is more expensive compared to conventional design, but it is worth to consider in terms of environmental concerns.
