Yeon S.J.,Inha University |
Shim K.H.,Inha University |
Hong J.S.,Inha University |
Hong J.S.,Korea Institute of Coastal Ecology Inc. |
Shin H.S.,Inha University
Korean Journal of Chemical Engineering | Year: 2017
A serine protease was purified from Marphysa sanguinea through ammonium sulfate followed by ion exchange chromatography, and its N-terminal amino sequence was identified to be IVGGSEATPYQFPFQ. Fibrinolytic activity was depended on both direct fibrinolysis and indirect plasminogen-mediated cascade and had a consistent activity irrespective of pH. The serine protease could be confirmed to degrade α-, β-, and γ-chains of human fibrinogen through fibrinogenolytic assay and did not express significant cytotoxicity to endothelial cells. These imply the enzyme has anticoagulant as well as thrombolytic activity, not significantly impairing endothelial cells comprising brain blood brain barrier (BBB) tissue. Conclusively, the new serine protease is worthy of being a candidate to substitute tissue-Plasminogen Activator (t-PA) for acute ischemic reperfusion injury of brain. © 2017 Korean Institute of Chemical Engineers, Seoul, Korea
Yoo J.-W.,Korea Institute of Coastal Ecology Inc. |
Lee Y.-W.,Fish Program |
Ruesink J.L.,University of Washington |
Lee C.-G.,Korea Institute of Coastal Ecology Inc. |
And 8 more authors.
Environmental Monitoring and Assessment | Year: 2010
The coast of the Korean peninsula experiences a range of human impacts, including pollution, shipping, reclamation, and aquaculture, that have motivated numerous local studies of macrobenthic organisms. In this paper, 1,492 subtidal stations were compiled from 23 studies (areas) to evaluate environmental quality on a broader scale. A common index in biomonitoring, Shannon-Wiener evenness proportion (SEP), could not incorporate azoic or single-species samples. This shortcoming was overcome by developing an inverse function of SEP (ISEP), which was positively correlated with independent measures of water quality available for nine sites and was not biased by the size of the sampling unit. Additionally, at Shihwa Dike, where samples were collected before and after reinstating a tidal connection with the ocean, ISEP values improved over time, as expected. Thus, it is now possible to assign Korean subtidal sites to seven ISEP "grades" and to use their values and trends to guide coastal management. © 2009 Springer Science+Business Media B.V.
Choi K.-H.,Korea Institute of Coastal Ecology Inc |
Lee S.-M.,Anyang University, South Korea |
Lim S.-M.,Anyang University, South Korea |
Walton M.,Korea Ocean Research and Development Institute |
Park G.-S.,Anyang University, South Korea
Journal of Oceanography | Year: 2010
Yellow Sea tidal flats are internationally recognised for their contribution to biological diversity and yet are under enormous pressure from reclamation, pollution and overexploitation. The benthic macroinfauna community is the dominant community on these tidal flats and a reliable indicator of benthic environmental changes. We surveyed the current benthic macroinfauna community of the Ganghwa Southern Tidal Flat, the largest remaining Korean mud flat in the Yellow Sea, in order to examine changes in the environmental situation of this benthic ecosystem. The results show a significant decline in species diversity from the last survey made in 2003, and a shift in species composition with appearances of polychaetes indicative of pollution and physical disturbances and other opportunistic species becoming dominant in both density and biomass. The benthic community shift observed during the two study periods may be associated with increased nutrient pollution as well as increased physical disturbances in this area. However, we recognise the limitations of the data both in frequency and scope but believe the significant changes to the composition of the benthic fauna are sufficient to warrant concern. Observations are required to examine the extent to which these human activities induce benthic community shift in this tidal flat. © 2010 Springer Science+Business Media B.V.
Choi K.-H.,Korea Institute of Coastal Ecology Inc. |
Kim Y.-O.,Korea Ocean Research and Development Institute |
Lee J.-B.,Jeju National University |
Wang S.-Y.,ARA Consulting and Technology |
And 5 more authors.
Journal of Marine Science and Technology | Year: 2012
Over a five-year period, this study examined the overall impact of coal power plant cooling processes on entrained copepods and the local plankton community on the west coast of Korea. Mortality differences between the intake and discharge water of the single most dominant copepod, Acartia hongi, were positively correlated with temperature differences between the two locations. Laboratory tests showed copepod sensitivity to temperature increase, and with very low chlorine concentration applied, thermal stress was the major source of copepod mortality. Chlorophyll a concentration, ciliate abundance, and total copepod abundance at the intake showed no discernable differences from the values at the discharge. Most likely, this was due to rapid mixing of the population in the discharge water with adjacent populations in the macrotidal open coastal water environment.
Jeong S.-Y.,Inha University |
Jeong S.-Y.,Korea Institute of Coastal Ecology Inc. |
Kim J.-H.,West Marine |
Lee W.-O.,South Korean National Fisheries Research and Development Institute |
And 2 more authors.
Fish Physiology and Biochemistry | Year: 2014
This study aimed to better understand the hydromineral regulatory response of the anadromous river pufferfish, Takifugu obscurus, to salinity changes through real-time RT-PCR. After abrupt transfer from 30 or 5 psu to 5 or 30 psu, respectively, we analyzed the mRNA expression of Na+/K+ ATPase, prolactin receptor, and aquaporin from osmoregulatory organs of the river pufferfish such as gills, kidney, and intestine. Na+/K+ ATPase showed notable changes in the gills and kidney when salinity was increased. In the gills, the expression level of Na+/K+ ATPase suddenly increased within a day after abrupt transfer from 5 to 30 psu and then slightly declined within 2 days after exposure. In the kidney, Na+/K+ ATPase has shown consistently high mRNA expression after the increase in salinity. Expression levels of the prolactin receptor gene increased when environmental salinity decreased. In the intestine, gene expression of the prolactin receptor remained high, even when salinity decreased. To the contrary, there was a steady increase or decrease in mRNA expression in the kidney in response to salinity decrease or increase, respectively. As for aquaporins, aquaporin 1 was mainly expressed in the intestine and kidney, and aquaporin 3 was mainly expressed in the gills and intestine. In the gills, increased expression of aquaporin 3 was found after transfer to lower salinity and in the intestine and kidney, a decrease in salinity followed by an abrupt decrease in aquaporin 1 and aquaporin 3. Contrastingly, the expression of these genes increased in the intestine after transfer to 30 psu. Osmoregulatory genes were expressed in diverse organs, apparently to overcome an influx or exhaust of water or ions. A superior adaptation ability of the river pufferfish to a wide range of salinities is most reasonably due to active osmoregulatory processes mediated by the genes monitored here. © 2013 Springer Science+Business Media Dordrecht.
Hong H.-P.,Korea Institute of Coastal Ecology Inc |
Hong H.-P.,Inha University |
Han C.-H.,NFRDI |
Yoo J.-K.,Marine Ecosystem Management Team
Ocean and Polar Research | Year: 2013
We investigated the population dynamics of Aurelia aurita in Sihwa Lake from April to October in 2009. Salinity ranged from 5.9 to 30.7 psu at the surface. Abundance of mesozooplankton ranged from 3 to 111,874 indiv. m-3. Ephyrae occurred from April to May with the peak in abundance occurring on 17 April. Maximum density of ephyrae was observed near the power transmission towers that are known to be habitats of polyps. Mortality of ephyrae was lower than in other areas because of the abundant prey concentration and the absence of predators. Young medusae occurred from April to July with the peak in abundance occurring on 8 May. Adult medusae occurred from May to July with the peak in abundance on 25 June and they disappeared before the rainy season. Planula occurred only in May and June with the peak in abundance on 25 June. Growth rates of Aurelia aurita ranged from -0.06 to 0.34 d-1, and decreased rapidly after May. The period in which adult medusa occurred was restricted, compared with those in other area in Korea (e.g., Masan Bay) and Japan (e.g., Tokyo Bay). In the period of this study, the available food was limited in June and salinity decreased to ca. 20 psu in May because of the beginning of the wet season. We assumed that the exceptionally short period of occurrence of the medusa may be a response of adults to changes in temperature, salinity or food limitation which leads to the precocious maturation of young medusa and the release of planula and that the brief occurrence of medusa was caused by an abrupt decrease in activity after the release of planula.
Yoo J.-W.,Korea Institute of Coastal Ecology Inc. |
Lee H.-J.,Korea Institute of Coastal Ecology Inc. |
Hong J.-S.,Inha University
Ocean Science Journal | Year: 2016
We performed a time-series analysis of environmental variables and biological parameters to understand temporal variations in the macrobenthic community in the Chokchon macrotidal flats, Incheon, Korea. Bimonthly sampling of macrobenthos and sediments was conducted from May 1989 through November 2001. A decomposition method composed of seasonality, trends and cyclical variation was employed in this study. We focused on trends of the selected variables and assumed that those with positive or negative trends caused changes in biological parameters. Most variables showed strong seasonality (≥ 95% of the total variance). Significant positive trends (p < 0.0001) were observed in sea water temperature and sediment ignition loss. Macrobenthic biomass and species number also showed significant positive trends (p < 0.0001). Biomass indicated that the study area underwent eutrophication since the mid 1990s. A notable increase in species number occurred throughout the study period. The flattened temperature trend after 1994 and intensified eutrophication after the mid 1990s indicated that the species increase in the former period was in response to increasing temperature, while that in the latter period was caused by eutrophication. Although our study suggested an increasing trend in diversity, it is important to check for unexpected changes and establish monitoring programs to provide early warnings, especially in lower latitudes. © 2016, Korea Ocean Research & Development Institute (KORDI) and the Korean Society of Oceanography (KSO) and Springer Science+Business Media Dordrecht.
Hong H.P.,Inha University |
Hong H.P.,Korea Institute of Coastal Ecology Inc |
Choi J.K.,Inha University
Ocean Science Journal | Year: 2015
The microlage Dunaliella salina, a major producer in salterns, is a serious problem for salt production. In this study we tried to assess if Fabrea salina can control D. salina. By parameterising numerical and functional response (growth and grazing vs prey abundance, respectively) at 90 psu and 30°C, where the ciliate is abundant and grows well, we developed a predator-prey model. The model is used to explore how change in microalga growth rate affect the dynamics, and the functional response is used in combination with field data to assess the potential impact of F. salina on D. salina. Over the 20 d simulation the ciliate controlled the prey population under all prey growth rates; although once D. salina were exhausted below the threshold level, F. salina died due to starvation, allowing the alga to increase in abundance, resulting in one or two predatorprey cycle, depending on prey growth rate. In general, the model predicted trends observed by others in the field, suggesting that it provided a good prediction of what may occur under the conditions we examined. Likewise we show that the ciliate can have a high impact on microalgal populations in the field. Finally, a literature review indicated that F. salina could be a good competitor with other protozoa and metazoan in salterns, depending on salinity and temperature, which requires further study and attention. In summary, we encourage continued studies on this unique ciliate on solar salterns and suggest that it may be useful in the bio-control of micoalgae. © 2015, Korea Ocean Research & Development Institute (KORDI) and the Korean Society of Oceanography (KSO) and Springer Science+Business Media Dordrecht.
Yoo J.-W.,Korea Institute of Coastal Ecology Inc. |
Lee Y.-W.,Texas A&M University-Corpus Christi |
Lee C.-G.,Korea Institute of Coastal Ecology Inc. |
Kim C.-S.,Korea Institute of Coastal Ecology Inc.
Marine Environmental Research | Year: 2013
Accurate predictions of benthic macrofaunal biodiversity greatly benefit the efficient planning and management of habitat restoration efforts in tidal flat habitats. Artificial neural network (ANN) prediction models for such biodiversity were developed and tested based on 13 biophysical variables, collected from 50 sites of tidal flats along the coast of Korea during 1991-2006. The developed model showed high predictions during training, cross-validation and testing. Besides the training and testing procedures, an independent dataset from a different time period (2007-2010) was used to test the robustness and practical usage of the model. High prediction on the independent dataset (r = 0.84) validated the networks proper learning of predictive relationship and its generality. Key influential variables identified by follow-up sensitivity analyses were related with topographic dimension, environmental heterogeneity, and water column properties. Study demonstrates the successful application of ANN for the accurate prediction of benthic macrofaunal biodiversity and understanding of dynamics of candidate variables. © 2012 Elsevier Ltd.
PubMed | Korea Institute of Coastal Ecology Inc.
Type: | Journal: Marine environmental research | Year: 2013
Accurate predictions of benthic macrofaunal biodiversity greatly benefit the efficient planning and management of habitat restoration efforts in tidal flat habitats. Artificial neural network (ANN) prediction models for such biodiversity were developed and tested based on 13 biophysical variables, collected from 50 sites of tidal flats along the coast of Korea during 1991-2006. The developed model showed high predictions during training, cross-validation and testing. Besides the training and testing procedures, an independent dataset from a different time period (2007-2010) was used to test the robustness and practical usage of the model. High prediction on the independent dataset (r = 0.84) validated the networks proper learning of predictive relationship and its generality. Key influential variables identified by follow-up sensitivity analyses were related with topographic dimension, environmental heterogeneity, and water column properties. Study demonstrates the successful application of ANN for the accurate prediction of benthic macrofaunal biodiversity and understanding of dynamics of candidate variables.