Search Results

Now showing 1 - 4 of 4

Some of the metrics are blocked by your
consent settings
Influence of leaf type, genotype, and location on bioactivities and assessment of genetic diversity in teak (Tectona grandis L. f.)
(2026-03-01)
Poeaim, S.
;
Phonmakham, J.
Marked variation in biological activities was observed among teak (Tectona grandis L. f.) leaf extracts as influenced by leaf type, tree genotype, and planting location. Fresh leaves generally exhibited stronger antibacterial activity than fallen leaves, with significant differences detected among plus trees originating from Chiang Mai, Phrae, Sukhothai, Lampang, and Khon Kaen and grown at the Thongphaphum and Phitsanulok Silviculture Research Stations. Among all samples, the Phrae plus tree cultivated at Thongphaphum showed the highest antibacterial inhibition against the tested microorganisms. Methanol extracts demonstrated antibacterial, anti-tyrosinase, and anti-inflammatory activities, while sequential extraction of Phrae plus tree leaves using hexane and dichloromethane yielded fractions with potent antibacterial effects, indicating promising potential for the development of new antibacterial agents. Genetic analysis based on sequence-related amplified polymorphism (SRAP) markers revealed similarity coefficients ranging from 0.67 to 1.00, reflecting low to moderate genetic diversity among the studied germplasm, with some samples exhibiting nearly identical genetic profiles. Overall, the observed variation in biological activities was closely associated with both genetic background and environmental conditions, providing valuable information for teak germplasm selection and the utilization of leaf-derived bioactive compounds in product development.
Some of the metrics are blocked by your
consent settings
Eco-Economy: Utilization of Sapwood Scraps for Sustainable Economic Value in Communities
(2023-01-01)
Egwutvongsa, Songwut
The objective of this research was to design furniture products from the sapwood of teak trees aged between 7-14 years with lining up for planting. Moreover, the results of the newly developed furniture design were analyzed with a structural equation model from the required level for furniture products made from sapwood waste. The population comprised one hundred and two consumers of teak products who visited the exhibition from on 10th at Rajamangala University of Technology Isan in Nakhon Ratchasima Province. In addition, the sample group included eighty consumers of teak products who visited Exhibition on 10th using Krejcie & Morgan random sampling table and simple random sampling. In this case, the research tool was a structured questionnaire to be measured by using a 5-level Likert rating scale and a Cronbach's Alpha coefficient of 0.813. Accordingly, it was considered to be at a suitable level by using Confirmatory Factor Analysis (CFA) with the results shown as χ<sup>2</sup>= 15.703, df = 32, relative χ<sup>2</sup> = .491, p = .993, RMSEA = .000, RMR = .020, GFI = .967, AGFI = .920, NFI = .950, TLI = 1.137, CFI = 1.000. In this case, it can be concluded that the feelings that affect consumer demand for products consist of 4 main factors with the characteristics of the material, social currency factor, behavioral expression factor, and market demand factor, among others.
Some of the metrics are blocked by your
consent settings
Eco-Efficiency Products: A Guideline for Teak Utilization Over 13-15 Years
(2022-03-01)
Lertchamchongkul, Theerathat
;
Egwutvongsa, Songwut
The objective of this research was to develop a guideline for teak utilization over 13-15 years. In this case, the population comprised one thousand, one hundred, and twenty-nine participants at the academic conference and Thai natural resource exhibition, while the group sampling included a visitor group comprising ninety-four people at the exhibition and young teak product sales at the level of deviation of 10 percent. In this case, a 5-point rating scale was used as a research tool employing structured questionnaires, with a reliability value at the level of 0.7842. The results found that the participants had satisfaction in the produced model from young teak at the excellent level, (Mean=4.202; S.D.=0.649) according to the eight fields of satisfaction assessment consisting of 1) Function, 2) Durability, 3) Economics, 4)Material, 5)Ease of Use, 6)Construction, 7)Aesthetics, and 8)Production. Therefore, there were the means of each satisfaction field at the same level with a significance of .05, and the research results in the community group could be applied to use with the utilization pattern of young teak for 13-15 years by increasing economic value for teak garden cultivation in various communities.
Some of the metrics are blocked by your
consent settings
Antibacterial and anti-tyrosinase activities of the methanolic extracts from leaves of Tectona grandis
(2018-12-01)
Phonmakham, J.
;
Wattanasuksakul, S.
;
Poeaim, S.
The antibacterial and anti-tyrosinase activities of methanolic extracts from fresh and fallen leaves of Tectona grandis (Teak) was studied. Fresh and fallen of teak leaves were collected from Thongphaphum and Phitsanulok silviculture research station. Antibacterial activity was determined by disc diffusion method with concentration at 500 µg/disc. Fresh and fallen of teak leaves extracts showed a good activity against Staphylococcus aureus and Staphylococcus epidermidis. In the other hand, fresh teak leaves inhibited growth of Propionibacterium acnes better than fallen teak leaves. The anti-tyrosinase activity was determined by Dopachrome method with concentration at 1500 µg/ml, inhibitory power of tyrosinase enzyme from fresh and fallen leaves extracts value were detected in the percentage between 35.45%-73.65%.

KMITL

Browse

Filters

Settings

Sort By

Results per page

Search Results