scholarly journals Status, Alert System, and Prediction of Cyanobacterial Bloom in South Korea

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Ankita Srivastava ◽  
Chi-Yong Ahn ◽  
Ravi Kumar Asthana ◽  
Hyung-Gwan Lee ◽  
Hee-Mock Oh
Keyword(s):  
South Korea ◽  
Prediction Models ◽  
Current Knowledge ◽  
Management Strategies ◽  
Cyanobacterial Bloom ◽  
Field Studies ◽  
Toxin Production ◽  
Ecological Problem ◽  
South Korean ◽  
Freshwater Bodies

Bloom-forming freshwater cyanobacterial genera pose a major ecological problem due to their ability to produce toxins and other bioactive compounds, which can have important implications in illnesses of humans and livestock. Cyanobacteria such asMicrocystis, Anabaena, Oscillatoria, Phormidium, andAphanizomenonspecies producing microcystins and anatoxin-a have been predominantly documented from most South Korean lakes and reservoirs. With the increase in frequency of such blooms, various monitoring approaches, treatment processes, and prediction models have been developed in due course. In this paper we review the field studies and current knowledge on toxin producing cyanobacterial species and ecological variables that regulate toxin production and bloom formation in major rivers (Han, Geum, Nakdong, and Yeongsan) and reservoirs in South Korea. In addition, development of new, fast, and high-throughput techniques for effective monitoring is also discussed with cyanobacterial bloom advisory practices, current management strategies, and their implications in South Korean freshwater bodies.

scholarly journals A Review of the Effect of Trace Metals on Freshwater Cyanobacterial Growth and Toxin Production

Toxins ◽  
2019 ◽  
Vol 11 (11) ◽  
pp. 643 ◽  
Author(s):  
Jordan A. Facey ◽  
Simon C. Apte ◽  
Simon M. Mitrovic
Keyword(s):  
Trace Metals ◽  
Current Knowledge ◽  
Cyanobacterial Bloom ◽  
Toxin Production ◽  
Cyanobacterial Blooms ◽  
Future Research ◽  
Limiting Factor ◽  
Bloom Formation ◽  
Wide Range

Cyanobacterial blooms are becoming more common in freshwater systems, causing ecological degradation and human health risks through exposure to cyanotoxins. The role of phosphorus and nitrogen in cyanobacterial bloom formation is well documented and these are regularly the focus of management plans. There is also strong evidence that trace metals are required for a wide range of cellular processes, however their importance as a limiting factor of cyanobacterial growth in ecological systems is unclear. Furthermore, some studies have suggested a direct link between cyanotoxin production and some trace metals. This review synthesises current knowledge on the following: (1) the biochemical role of trace metals (particularly iron, cobalt, copper, manganese, molybdenum and zinc), (2) the growth limitation of cyanobacteria by trace metals, (3) the trace metal regulation of the phytoplankton community structure and (4) the role of trace metals in cyanotoxin production. Iron dominated the literature and regularly influenced bloom formation, with 15 of 18 studies indicating limitation or colimitation of cyanobacterial growth. A range of other trace metals were found to have a demonstrated capacity to limit cyanobacterial growth, and these metals require further study. The effect of trace metals on cyanotoxin production is equivocal and highly variable. Better understanding the role of trace metals in cyanobacterial growth and bloom formation is an essential component of freshwater management and a direction for future research.

Elusive Belonging

2018 ◽  
Author(s):  
Minjeong Kim
Keyword(s):  
South Korea ◽  
Sense Of Belonging ◽  
Foreign Born ◽  
Multicultural Society ◽  
Projected Image ◽  
South Korean ◽  
Everyday Lives

With the unprecedented number of foreign-born population, South Korea has tried to reinvent itself as a multicultural society, but the intense multiculturalism efforts have focused exclusively on marriage immigrants. At the advent and height of South Korea’s eschewed multiculturalism, Elusive Belonging takes the readers to everyday lives of marriage immigrants in rural Korea where the projected image of a developed Korea which lured marriage immigrants and the gloomy reality of rural lives clashed. The intimate ethnographic account pays attention to emotional entanglements among Filipina wives, South Korean husbands, in-laws, and multicultural agents, with particular focus on such emotions as love, intimacy, anxiety, gratitude, and derision, which shape marriage immigrants’ fragmented citizenship and elusive sense of belonging to their new country. This investigation of the politics of belonging illuminates how marriage immigrants explore to mold a new identity in their new home, Korea.

The Emergence of Business Groups: Israel and South Korea Compared

2002 ◽  
Vol 23 (5) ◽  
pp. 737-758 ◽  
Author(s):  
Daniel Maman
Keyword(s):  
South Korea ◽  
Multinational Corporations ◽  
Business Groups ◽  
South Korean ◽  
Economic Organizations ◽  
Self Sufficiency ◽  
Institutional Contexts ◽  
1960S And 1970S ◽  
The 1960S ◽  
Korean State

This paper examines the emergence of business groups in Israel and South Korea. The paper questions how, in very different institutional contexts, similar economic organizations emerged. In contrast to the political, cultural and market perspectives, the comparative institutional analysis adopted in this research suggests that one factor alone could not explain the emergence of business groups. In Israel and South Korea, business groups emerged during the 1960s and 1970s, and there are common factors underlying their formation: state-society relations, the roles and beliefs of the elites, and the relative absence of multinational corporations in the economy. To a large extent, the chaebol are the result of an intended creation of the South Korean state, whereas the Israeli business groups are the outcome of state policies in the economic realm. In both countries, the state elite held a developmental ideology, did not rely on market forces for economic development, and had a desire for greater economic and military self-sufficiency. In addition, both states were recipients of large grants and loans from other countries, which made them less dependent on direct foreign investments. As a result, the emerging groups were protected from the intense competition of multinational corporations.

scholarly journals Ecophysiological Aspects and sxt Genes Expression Underlying Induced Chemical Defense in STX-Producing Raphidiopsis raciborskii (Cyanobacteria) against the Zooplankter Daphnia gessneri

Toxins ◽  
2021 ◽  
Vol 13 (6) ◽  
pp. 406
Author(s):  
Mauro C. P. Vilar ◽  
Thiago F. C. P. Rodrigues ◽  
Luan O. Silva ◽  
Ana Beatriz F. Pacheco ◽  
Aloysio S. Ferrão-Filho ◽  
...  
Keyword(s):  
Induced Defense ◽  
Toxin Production ◽  
Grazing Pressure ◽  
Chemical Defenses ◽  
Widespread Occurrence ◽  
Genes Expression ◽  
Freshwater Bodies ◽  
Predator Response ◽  
Aquatic Food ◽  
Shed Light

Cyanobacteria stand out among phytoplankton when they form massive blooms and produce toxins. Because cyanotoxin genes date to the origin of metazoans, the hypothesis that cyanotoxins function as a defense against herbivory is still debated. Although their primary cellular function might vary, these metabolites could have evolved as an anti-predator response. Here we evaluated the physiological and molecular responses of a saxitoxin-producing Raphidiopsis raciborskii to infochemicals released by the grazer Daphnia gessneri. Induced chemical defenses were evidenced in R. raciborskii as a significant increase in the transcription level of sxt genes, followed by an increase in saxitoxin content when exposed to predator cues. Moreover, cyanobacterial growth decreased, and no significant effects on photosynthesis or morphology were observed. Overall, the induced defense response was accompanied by a trade-off between toxin production and growth. These results shed light on the mechanisms underlying zooplankton–cyanobacteria interactions in aquatic food webs. The widespread occurrence of the cyanobacterium R. raciborskii in freshwater bodies has been attributed to its phenotypic plasticity. Assessing the potential of this species to thrive over interaction filters such as zooplankton grazing pressure can enhance our understanding of its adaptive success.

scholarly journals Engineering care in pandemic technogovernance: The politics of care in China and South Korea’s COVID-19 tracking apps

2021 ◽  
pp. 146144482110207
Author(s):  
Youngrim Kim ◽  
Yuchen Chen ◽  
Fan Liang
Keyword(s):  
South Korea ◽  
Textual Analysis ◽  
National Belonging ◽  
Surveillance Studies ◽  
South Korean ◽  
Care Services ◽  
Ideological Dimension ◽  
And Control

This article critically examines South Korea and China’s COVID-19 tracking apps by bridging surveillance studies with feminist technoscience’s understanding of the “politics of care”. Conducting critical readings of the apps and textual analysis of discursive materials, we demonstrate how the ideological, relational, and material practices of the apps strategically deployed “care” to normalize a particular form of pandemic technogovernance in these two countries. In the ideological dimension, media and state discourse utilized a combination of vilifying and nationalist rhetoric that framed one’s acquiescence to surveillance as a demonstration of national belonging. Meanwhile, the apps also performed ambivalent roles in facilitating essential care services and mobilizing self-tracking activities, which contributed to the manufacturing of pseudonormality in these societies. In the end, we argue that the Chinese and South Korean governments managed to frame their aggressive surveillance infrastructure during COVID-19 as a form of paternalistic care by finessing the blurred boundaries between care and control.

scholarly journals The Effect of Gut Bacteria on the Physiology of Red Palm Weevil, Rhynchophorus ferrugineus Olivier and Their Potential for the Control of This Pest

Insects ◽  
2021 ◽  
Vol 12 (7) ◽  
pp. 594
Author(s):  
Qian-Xia Liu ◽  
Zhi-Ping Su ◽  
Hui-Hui Liu ◽  
Sheng-Ping Lu ◽  
Bing Ma ◽  
...  
Keyword(s):  
Molecular Mechanisms ◽  
Current Knowledge ◽  
Management Strategies ◽  
Gut Bacteria ◽  
Economic Losses ◽  
Rhynchophorus Ferrugineus ◽  
Intestinal Immunity ◽  
Red Palm Weevil ◽  
Nutrient Metabolism ◽  
Palm Weevil

Red Palm Weevil (RPW), Rhynchophorus ferrugineus Olivier, is a notorious pest, which infests palm trees and has caused great economic losses worldwide. At present, insecticide applications are still the main way to control this pest. However, pesticide resistance has been detected in the field populations of RPW. Thus, future management strategies based on the novel association biological control need be developed. Recent studies have shown that the intestinal tract of RPW is often colonized by multiple microbial species as mammals and model insects, and gut bacteria have been found to promote the growth, development and immune activity of RPW larvae by modulating nutrient metabolism. Furthermore, two peptidoglycan recognition proteins (PGRPs), PGRP-LB and PGRP-S1, can act as the negative regulators to modulate the intestinal immunity to maintain the homeostasis of gut bacteria in RPW larvae. Here, we summarized the current knowledge on the gut bacterial composition of RPW and their impact on the physiological traits of RPW larvae. In contrast with metazoans, it is much easier to make genetic engineered microbes to produce some active molecules against pests. From this perspective, because of the profound effects of gut bacteria on host phenotypes, it is promising to dissect the molecular mechanisms behind their effect on host physiology and facilitate the development of microbial resource-based management methods for pest control.

scholarly journals Prevalence and socioeconomic burden of diabetes mellitus in South Korean adults: a population-based study using administrative data

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Sung-Hee Oh ◽  
Hyemin Ku ◽  
Kang Seo Park
Keyword(s):  
South Korea ◽  
Diabetic Complications ◽  
Economic Burden ◽  
Productivity Loss ◽  
Diabetic Patients ◽  
Claims Database ◽  
South Korean ◽  
Subgroup Analyses ◽  
Per Capita ◽  
Capita Cost

Abstract Background Diabetes leads to severe complications and imposes health and financial burdens on the society. However, currently existing domestic public health studies of diabetes in South Korea mainly focus on prevalence, and data on the nationwide burden of diabetes in South Korea are lacking. The study aimed to estimate the prevalence and economic burden of diabetes imposed on the South Korean society. Methods A prevalence-based cost-of-illness study was conducted using the Korean national claims database. Adult diabetic patients were defined as those aged ≥20 years with claim records containing diagnostic codes for diabetes (E10-E14) during at least two outpatient visits or one hospitalization. Direct costs included medical costs for the diagnosis and treatment of diabetes and transportation costs. Indirect costs included productivity loss costs due to morbidity and premature death and caregivers’ costs. Subgroup analyses were conducted according to the type of diabetes, age (< 65 vs. ≥65), diabetes medication, experience of hospitalization, and presence of diabetic complications or related comorbidities. Results A total of 4,472,133 patients were diagnosed with diabetes in Korea in 2017. The average annual prevalence of diabetes was estimated at 10.7%. The diabetes-related economic burden was USD 18,293 million, with an average per capita cost of USD 4090 in 2019. Medical costs accounted for the biggest portion of the total cost (69.5%), followed by productivity loss costs (17.9%), caregivers’ costs (10.2%), and transportation costs (2.4%). According to subgroup analyses, type 2 diabetes, presence of diabetic complications or related comorbidities, diabetes medication, and hospitalization represented the biggest portion of the economic burden for diabetes. As the number of complications increased from one to three or more, the per capita cost increased from USD 3991 to USD 11,965. In inpatient settings, the per capita cost was ~ 10.8 times higher than that of outpatient settings. Conclusions South Korea has a slightly high prevalence and economic burden of diabetes. These findings highlight the need for effective strategies to manage diabetic patients and suggest that policy makers allocate more health care resources to diabetes. This is the first study on this topic, conducted using a nationally representative claims database in South Korea.

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