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Tsutsui I.,Japan International Research Center for Agricultural science | Tsutsui I.,King Mongkuts Institute Of Technology Ladkrabang Kmitl | Songphatkaew J.,King Mongkuts Institute Of Technology Ladkrabang Kmitl | Meeanan C.,Shrimp Co culture Research Laboratory SCORL | And 7 more authors.
International Aquatic Research

The increase in global demand for fishery products has led to a fivefold increase in aquaculture production since 1990. Commercial feed is the highest production cost in intensive aquaculture, and residual commercial feed leads to eutrophication; hence it is important to find a low-cost alternative that has less environmental impact. We investigate the use of the filamentous green algae, Chaetomorpha sp., as a raw feed for giant tiger prawns. The giant tiger prawn, Penaeus monodon was grown in monoculture, and in co-culture with Chaetomorpha sp. to investigate the potential benefits of co-culturing. Five 20-day-old giant tiger prawn juveniles were released in 70-L monoculture and co-culture tanks, and the specific growth rate (SGR) and feed conversion ratio (FCR) were measured after 10 weeks. The final mean body weight of co-cultured prawns was approximately 50 % heavier than that of monocultured prawns. The SGR in co-culture tanks was 4.79 ± 0.08 % day−1, which was higher than that in monoculture tanks (4.14 ± 0.27 % day−1). The FCR was 38.9 % lower in co-culture than in monoculture tanks. The protein content of Chaetomorpha sp. obtained from proximate analysis was almost the same or a little lower than other filamentous green seaweeds; however, the Chaetomorpha sp. has higher fiber and gross energy. These results show that Chaetomorpha sp. has potential for reducing feed costs in prawn intensive aquaculture through co-culturing. © 2015, The Author(s). Source

Kaewpongumpai S.,King Mongkuts Institute Of Technology Ladkrabang Kmitl | Poeaim S.,King Mongkuts Institute Of Technology Ladkrabang Kmitl | Vanijajiva O.,Phranakhon Rajabhat University

Kaewpongumpai S, Poeaim S, Vanijajiva O. 2016. Sequence-Related Amplified Polymorphism (SRAP) analysis for studying genetic characterization of Bouea macrophylla. Biodiversitas 17: 539-543. Bouea macrophylla Griff. is well-known as one of native typical fruits in Southeast Asia which needs to be preserved and continuously cultivated because of economical and ecological significances. More recently, sequence-related amplified polymorphism (SRAP) markers have been developed, which are used to amplify coding regions of DNA with primers targeting open reading frames. This technique has proven to be robust and highly variable and is attained through a significantly less technically demanding process. In this research, SRAP method was preliminary applied to assess genetic characterization of B. macrophylla. Genomic DNA was extracted from fresh leaf samples. The result clearly showed that at 100 ng template DNA and MgCl2 5 mM concentration are suitable for further PCR analysis. Thirty SRAP primer combinations were initially screened for analysis and 26 primer combinations were chosen for further analysis. A total of 222 DNA fragments, varying from 90-2500 bp, were amplified. The produced band number for each optimal primer set ranged from 3 to 12 with a percentage of polymorphic bands spanning from 33.33 to 80.00%. Therefore, SRAP analysis is suitable for further analysis method on genetic study of Bouea species and related genera. © 2016, Society for Indonesian Biodiversity. All rights reserved. Source

Jomtarak R.,Suan Dusit Rajabhat University | Jomtarak R.,King Mongkuts Institute Of Technology Ladkrabang Kmitl | Yupapin P.P.,King Mongkuts Institute Of Technology Ladkrabang Kmitl | Yupapin P.P.,Kasem Bundit University | Yupapin P.P.,Kasetsart University
Optoelectronics Letters

In this paper, the Čerenkov radiation of light pulse in a microring and gratings is simulated and investigated. The system design consists of a two-defect grating incorporating a microring, connected with a uniform grating. In simulation, the continuous wave (CW) light pulse with wavelength centered at 1.55 μm is input into the microring device via the two-defect grating. The resonant outputs from the two-defect grating propagate through the microring and uniform grating, where the time delays of those two input pulses with different wavelengths through the system are distinguished by the output uniform grating. From the obtained resonant output pulses, we find that the red-shifted and blue-shifted Čerenkov pulses are observed. In applications, such a proposed system can be used to form two different optical delay pulses, in which the change in Čerenkov radiation of them, i.e., time delay within a microring device system, can be useful for Čerenkov radiation imaging and sensing applications. © 2015, Tianjin University of Technology and Springer-Verlag Berlin Heidelberg. Source

Wongsirichot T.,King Mongkuts Institute Of Technology Ladkrabang Kmitl | Hanskunatai A.,King Mongkuts Institute Of Technology Ladkrabang Kmitl
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)

Patients with Non-Communicable Diseases (NCDs) are increasing around the globe. Possible causes of the NCDs are continuously being investigated. One of them is a sleep disorder. In order to detect specific sleep disorders, the Polysomnography (PSG), is necessary. However, due to the lack of the PSG in many hospitals, researchers attempt to discover alternative approaches. This article demonstrates comparisons of sleep disorder classifications using machine learning techniques. Three main machine learning techniques have been compared including Classification And Regression Tree (CART), k-Mean Clustering (KMC) and Support Vector Machine (SVM). The SVM achieves the best classification results in NREM-1 and NREM-2. The CART performs superior in NREM-3 and REM. Implications in terms of medical diagnosis, there are two main selected features, SaO2 and Pulse, based on the CART in all of the sleep stages. The features may be pieces of evidences to predict various types of sleep disorders. © Springer International Publishing Switzerland 2015. Source

Tsutsui I.,Japan International Research Center for Agricultural science | Miyoshi T.,Japan National Research Institute of Fisheries And Environment of Inland Sea | Aue-umneoy D.,King Mongkuts Institute Of Technology Ladkrabang Kmitl | Songphatkaew J.,King Mongkuts Institute Of Technology Ladkrabang Kmitl | And 8 more authors.
International Aquatic Research

The effects of salinity and water temperature on growth and survival of Chaetomorpha sp., one of the green tidal filamentous algae, were investigated. Field surveys revealed that this alga was abundant throughout the year in stagnant coastal waters of central Thailand. Chaetomorpha sp. was found in salinities of 3.4–90.0 and water temperatures of 20.1–40.9 °C. Chaetomorpha sp. biomass fluctuated between 9.2 and 162 kg dry weight in a saline swamp, without significant differences among seasons. The highest mean specific growth rate of approximately, 60 % day−1 was observed in laboratory experimental trials at salinities of 20–30 at 30 °C. Salinity and water temperature significantly affected growth of this alga independently and interactively. Based on these results, Chaetomorpha sp. can easily grow, survive and monopolize in stagnant waters where the salinity and temperature greatly fluctuate because of their euryhaline and eurythermal nature as well as their high growth rate. © 2015, The Author(s). Source

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