DSpace 集合:
http://scholars.ntou.edu.tw/handle/123456789/20314
2024-03-29T05:35:50ZEngineering Feasibility Assessment of Cage Aquaculture in Offshore Wind Power Generation Areas in Taiwan
http://scholars.ntou.edu.tw/handle/123456789/22466
標題: Engineering Feasibility Assessment of Cage Aquaculture in Offshore Wind Power Generation Areas in Taiwan
作者: Tang, Hung-Jie; Chiang, Wen-Son; Nan, Fan-Hua
摘要: This paper investigates the engineering feasibility of cage aquaculture in the offshore wind farm area of Changhua, Taiwan. Two types of net cages commonly used in Taiwan are compared under typhoon wave and monsoon wave conditions to determine the suitable one. The submersible function of the selected cages to reduce the typhoon wave effect is analyzed. The yearly probability of the remaining volumes of the selected cages (deformed volume/undeformed volume) under a wave scatter diagram combined with a tidal current of the study area are analyzed and discussed. The influences of water depth on the selected cages for the site selection are investigated. Regarding the seabed sand waves in the study area, two potential disasters of mooring line failure and anchor sinking on the selected cages are considered and discussed. Both issues are a concern for the wind farm developers, fishery groups, and government authorities. According to the results, the selected cage aquaculture is feasible from an engineering standpoint in the case study area.2022-09-01T00:00:00ZCopepods as Indicators of Different Water Masses during the Northeast Monsoon Prevailing Period in the Northeast Taiwan
http://scholars.ntou.edu.tw/handle/123456789/22460
標題: Copepods as Indicators of Different Water Masses during the Northeast Monsoon Prevailing Period in the Northeast Taiwan
作者: Wang, Yan-Guo; Li-Chun Tseng; Sun, Rou-Xin; Chen, Xiao-Yin; Xiang, Peng; Wang, Chun-Guang; Xing, Bing-Peng; Hwang, Jiang-Shiou
摘要: Simple Summary How the origin and pathways of water masses can be traced by particular bioindicators remains an intriguing issue in biological oceanography. In the present zooplankton study focusing on copepods, calanoid copepodites were most abundant, with an average abundance of 774.24 +/- 289.42 (inds. m(-3)) in the northeastern waters of Taiwan during the prevailing northeast monsoon, followed by the dominant copepod species Paracalanus aculeatus and Clausocalanus furcatus. According to hydrological parameters, the water masses were mainly derived from northeast monsoon surface waters, Kuroshio intrusion water, and mixed water masses. Indicator species were Temora turbinata, Calanopia elliptica, and Canthocalanus pauper in the northeast monsoon-derived water mass. Farranula concinna and Copilia mirabilis represented suitable indicators for the Kuroshio intrusion water mass in the research area. In the mixed water mass, the indicator species were Paracandacia truncata, Oncaea clevei, and P. aculeatus in the research area during the sampling campaign in late autumn. During this research, the average surface temperature, salinity, dissolved oxygen, and pH were 24.65 +/- 1.53 (degrees C), 34.21 +/- 0.07 (PSU), 6.85 +/- 0.18 (mg/L), and 8.36 +/- 0.03, respectively. Based on these environmental parameters, stations were arranged into three groups. Group A represents stations located around Keelung Island with the relative highest average dissolved oxygen, lowest average temperature, and pH values. Instead, the lowest average dissolved oxygen and highest average temperature, salinity, and pH values were recorded at the offshore stations. Keelung Island area was charged by cold water masses, which were driven by the Northeast monsoon, and stations in group C were affected by the Kuroshio Current. Kueishan Island area was mainly affected by mixed water masses resulting from the Kuroshio intrusion and monsoon-derived cold water. In this study, a total of 108 copepod species were identified, with an average abundance of 774.24 +/- 289.42 (inds. m(-3)). Most species belong to the orders Calanoida and Poecilostomatoida, with an average relative abundance (RA) of 62.96% and 30.56%, respectively. Calanoid copepodites were the most dominant group, with a RA of 28.06%. This was followed by Paracalanus aculeatus, with a RA of 18.44%. The RA of Clausocalanus furcatus and Canthocalanus pauper was 4.80% and 3.59%, respectively. The dominant species P. aculeatus, C. pauper, Paracalanus parvus, and Temora turbinata were positively correlated with dissolved oxygen and negatively correlated with temperature in the surface waters. pH showed a negative correlation with P. parvus and T. turbinata, while the temperature was negatively correlated with these two dominant species. Indicator species were selected by an indicator value higher than 50%. Temora turbinata, Calanopia elliptica, C. pauper, Euchaeta concinna, Temora discaudata, Acartia pacifica, Macrosetella gracilis, Corycaeus speciosus, and P. parvus were considered as monsoonal cold water indicator species in Group A. Indicator copepod species for the Kuroshio Current were Farranula concinna, Copilia mirabilis, Candacia aethiopica, Corycaeus agilis, Farranula gibbula and Acrocalanus monachus in the study area. Paracandacia truncata, Oncaea clevei, P. aculeatus, and Centropages furcatus were considered suitable indicators for mixed water masses.2022-09-01T00:00:00ZFeeding ecology of the blacktip sawtail catshark Galeus sauteri from northeastern Taiwan
http://scholars.ntou.edu.tw/handle/123456789/22217
標題: Feeding ecology of the blacktip sawtail catshark Galeus sauteri from northeastern Taiwan
作者: Shing-Lai Ng; Shoou-Jeng Joung
摘要: Small-bodied sharks are recognized as mesopredators on different communities in a large variety of habitats, thus linking the trophic levels in the marine ecosystem. Dietary analysis on these species can provide insight into the trophic relationships in food webs. Our study analyzed the diet composition of Galeus sauteri, an abundant small shark inhabiting neritic shelf waters at depths between 60 and 200 m. For this purpose, a stomach content analysis was realized in 678 specimens collected by bottom trawlers off northeastern Taiwan from September 2018 to August 2019. The two most commonly consumed preys were teleosts (prey-specific index of relative importance, %PSIRI = 51.94) and crustaceans (%PSIRI = 30.08).The results for the Levins index (Ba = 0.06) and graphical analysis based on the Costello method revealed a high degree of specialization on lanternfishes and other teleosts. The mean trophic position was 4.29. Feeding habits differed significantly in relation to maturity condition and between seasons. Our result showed that G. sauteri is a primary piscivorous shark that preys mainly on lanternfishes and other teleosts, and feeds opportunistically on crustaceans and cephalopods.2022-09-07T00:00:00ZPurifiication of Artepillin C (ARC) with Anticancer Activities from Supercritical CO2-Ethanol Extracts of Brazilian Green Propolis by Using Adsorption Column Chromatography
http://scholars.ntou.edu.tw/handle/123456789/22204
標題: Purifiication of Artepillin C (ARC) with Anticancer Activities from Supercritical CO2-Ethanol Extracts of Brazilian Green Propolis by Using Adsorption Column Chromatography
作者: Chuang, Lin-Hsiang; Chen, Wen-Chin; Pei, Wen; Chuang, Ming-Hsi; Hsu, Todd; Chuang, Po-Chao
摘要: Phenolic compounds with varying phenolic structures are present in both terrestrial and marine organisms. Artepillin C (ARC) is a prenylated phenolic compound produced specifically in Brazilian green propolis. Earlier studies have demonstrated the potential of ARC as a dietary supplement for cancer prevention due to its ability to suppress tumor growth and metastasis. Here we report the development of an effective adsorption chromatography combined with supercritical CO2 extraction for the massive purification of ARC. A mixture of supercritical CO2 and ethanol extract of Brazilian green propolis was passed through a stainless chromatographic column packed with protruding metals at 4000 psi and 50 degrees C to remove wax from the column's base. ARC mixed with flavonoids collected from the top of the column was applied to another stainless column filled with silica gel under similar working conditions. After flavonoids were removed, strongly adsorbed ARC at the top portion of the column was collected by ethanol elution. The purity of ARC isolated using this method was between 90% and 95%, as indicated by HPLC chromatograms. Purified ARC strongly inhibited cancer cell division based on its cytotoxic effects on HCT116 human colon cancer cells, resulting in a signif-icantly increased distribution of cells in the S phase. ARC also blocks the motility of HCT116 cells, indicating its ability to suppress tumor metastasis. The developed chromatographic purification protocol can be used to isolate prenylated phenolic compounds from marine organisms.2022-09-01T00:00:00Z