• 미생물학회지
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• 제35권3호
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• pp.242-247
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• 1999

소양호에서 fluorescent in situ hybridization 방법을 이용하여 세균군집의 계절과 수심에 따른 변화를 조사하였다. 이 방법에 사용된 oligonucleotide probe는 EUB338, ALF1b, BET42a, GAM42a 와 CF probe 였다. 조사기간중 Proteobacteria $\alpha$-group 은 0.7~32.9% 이었으며 $\beta$-group은 1.0~25.8%, $\gamma$-group은 2.4~37.1%, Cytophaga-Flavobacterium group은 4.7~23.6%의 분포를 나타내었다. 계절별로 살펴보면 규조류가 우점하는 봄펄에는 $\gamma$-group 이, 유기물의 농도가 낮고 수온이 높은 여름철에는 $\alpha$-group 이 우점하였으며, 남조류가 우점하는 가을철에 총세균수에 대한 Eubacterial group 의 비율이 크게 감소하여 특정 group의 우점현상은 나타나지 않았다. 이처럼 소양호는 계절과 수심에 따라 군집구조가 변화하였으며, 특히 세균의 군집구조는 식물플랑크톤의 천이와 밀접한 관계를 보이는 것으로 나타났다.

• Preventive Nutrition and Food Science
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• 제7권2호
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• pp.201-206
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• 2002

Findings from European and American studies have indicated such health behaviors as smoking, drinking, lack of exercise, and insufficient intake of grains, fruits and vegetables as risk factors for hypertension. However, because dietary pattern and health behaviors of Korean differ from people of other countries, the risk factors for Koreans could be different. Therefore, the aim of this study was to identify food consumption patterns and health behavior characteristics of Korean hypertensive adults. Data on food consumptions and other health behaviors such as smoking, drinking, and exercise together with development of hypertension were collected from 597 persons aged 20 to 69 years in a local community. The first stage of analysis utilized cluster analysis to aggregate individuals into different health behavior and food consumption groups. Four health behavior groups were characterized by passive cluster, smoker cluster, fitness cluster and drinker cluster. Food consumption patterns of the subjects were also aggregated into 4 different clusters: dairy cluster, grain & vegetable cluster, fruit cluster, and fish & meat cluster. Then univariate analysis was followed to identify the variables associated with hypertension. The final stage of analysis was the identification of the relative importance of the variables selected from the univariate analysis on hypertension, using multiple logistic analysis. The results showed that heavy drinking was the most significant health behavior associated hypertension, which was similar to the findings in European and American studies. However, unlike the findings from foreign studies, grain and vegetable consumption appeared to be a risk factor for hypertension. A possible reason for the contradictory results between Korean and Western studies may be the dependence of Koreans on white rice as the major staple food, and/or the frequent consumption of salted vegetables, rather than fresh vegetables as is customary in Europe and America.

• 수산해양기술연구
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• 제43권4호
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• pp.241-250
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• 2007

Fishes were caught by a bottom trawl in the Yeo-ja bay of Korea by every three month(March, June, September and December) and seasonal variation of abundance and species composition were studied in 2005. The catches were 1,187kg and were composed of 115 species with 20 hauls by 5 stations. The dominant species caught were Charybdis bimcaulata, Crangon hakodatei, Parapenaeus fissurus, Oratosguilla oratoria, and Thryssa purava. One hundred fifty species were identified as fish(38%), crustacea(20%), mollusca(4%) and others(38%) which including of Asterias amurensis. The amount of species was high in June and September and low in March and December. The diversity index(H') was about 1.2－2.5 and station similarity of fishes caught among the community was 0.009－0.230.

• 한국수산과학회지
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• 제24권4호
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• pp.248-254
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• 1991

1990년 8월 아산만에서 otter trawl을 이용하여 저어류를 채집하여 정점을 대표할 수 있는 저어류 군집 자료수집 방법을 추정하였다. 조사기간 중 총 17종, 957개체, 21,840g의 어류가 채집되었으며, 참서대 (Cynoglossus joyneri), 곤어리 (Thrissa koreana), 쥐노래미 (Hexagrammos otakii)와 민태 (Johnius belengerii)가 출현 빈도도 높고 개체수와 생체량에서 우점하였다. 주야 10회 반복 채집결과 종조성은 주야에 따라 유의한 차이를 보이지 않았으나, otter trawl 20분 예인의 개체수 자료는 우점종의 경우는 평균에 대하여 $2.2-385.1\%$, 전어종은 $52.2-162.0\%$의 넓은 변이를 보였다 채집면적을 늘려 갔을 때 누적종수는 예인 4회 자료 누적 이후에는 증가가 둔화되었고 종다양성지수는 3회 이후 거의 점관선에 도달하였다. 개체수의 평균에 대한 분산은 자료를 누적시켰을 때 감소하여 4회 이후에는 자료가 Poisson 분포 양상을 보였다. Otter trawl을 이용하여 아산만 저어류를 채집할 때 20분 예인 4회 이상의 자료를 합하면 정성, 정량적으로 한 조사정점을 대표할 수 있는 것으로 판단된다.

• Animal cells and systems
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• 제16권2호
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• pp.162-171
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• 2012

We investigated food webs of a $Salix$ $subfragilis$-dominated wetland in the Janghang wetland in the Hangang estuary, which is very close to the Demilitarized Zone, along the west coast of Korea. Our study focused on understanding sesarmine crab ($Sesarma$ $dehaani$)-related food webs in a $S.$ $subfragilis$ forest. For our study, we used carbon and nitrogen stable isotopes and fatty acid biomarkers. We collected samples of plants, animals, and detrital sediment from four quadrats ($5{\times}5m^2$) set in the $S.$ $subfragilis$ community. Samples were collected from September 2006 to June 2009, except during the winter hibernation period of $S.$ $dehaani$. In the wet season, the sediment showed relatively high ${\delta}^{13}C$ and low ${\delta}^{15}N$ signatures compared with relatively low ${\delta}13C$ and high ${\delta}15N$ signatures in the dry season. Mature $S.$ $dehaani$ appeared to feed on fresh leaves and other carbon sources, such as immature individuals or fish, in addition to detrital sediment, which appeared to be the main carbon source for immature crabs. Principal component analysis of fatty acid biomarkers of $S.$ $dehaani$ showed a clear difference between immature individuals (10-30 mm) and mature ones (larger than 30 mm), indicating that the main food source for immature crabs was detrital sediment, whereas mature crabs foraged plants in addition to consuming detrital sediment. On the basis of our results from stable isotope and fatty acid analyses, mature $S.$ $dehaani$ appeared to feed on detrital sediment and fresh leaves of $S.$ $subfragilis$ in summer in addition to engaging in cannibalism of immature individuals.

• Journal of Microbiology and Biotechnology
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• 제18권11호
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• pp.1826-1835
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• 2008

An autotrophic denitrification reactor (ADR-l) and a heterotrophic denitrification reactor (HDR-2) were operated to remove nitrate and nitrite in an anoxic environment in raw sewage. The $NO_3$-N removal rate of ADR-l was shown to range from 52.8% to 78.7%, which was higher than the $NO_3$-N removal rate of HDR-2. Specific denitrification rates (SDNR) of ADR-l and HDR-2 were 3.0 to 4.0 and 1.1 to $1.2\;mgNO_3$-N/gVSS/h, respectively. From results of restriction fragment length polymorphism (RFLP) of the 16S rRNA gene, Aquaspirillum metamorphum, Alcaligenes defragrans, and Azoarcus sp. were $\beta$-Proteobacteria that are affiliated with denitritying bacteria in the ADR-l. Specifically, Thiobacillus denitrificans was detected as an autotrophic denitrification bacteria. In HDR-2, the $\beta$-Proteobacteria such as Denitritying-Fe-oxidizing bacteria, Alcaligenes defragrans, Acidovorax sp., Azoarcus denitrificans, and Aquaspirillum metamorphum were the main bacteria related to denitrifying bacteria. The $\beta$-and $\alpha$-Proteobacteria were the important bacterial groups in ADR-l, whereas the $\beta$-Proteobacteria were the main bacterial group in HDR-2 based on results of fluorescent in situ hybridization (FISH). The number of Thiobacillus denitrificans increased in ADR-l during the operation period but not in HRD-2. Overall, the data presented here demonstrate that many heterotrophic denitritying bacteria coexisted with autotrophic denitrifying bacteria such as Thiobacillus denitrificans for nitrate removal in ADR-l. On the other hand, only heterotrophic denitritying bacteria were identified as dominant bacterial groups in HDR-2. Our research may provide a foundation for the complete nitrate removal in raw sewage of low-COD concentration under anoxic condition without any external organic carbon or the requirement of post-treatment.

• The Korean Journal of Ecology
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• 제21권1호
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• pp.97-103
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• 1998

Yedang lake has so plentiful pondage and many species of fresh-walter-fish that a large number of people crowd around there all the year round. Most of them are not used to prevent tsutsugamushi disease spreading by chigger(T-mite). Accordingly, this study was carried out in order to obtain basic materials for prevention of this disease and the results are summarized as follows. The number of wild rat that captured in surveyed areas was sixty five(apodemus agrarius: 63, Rattus norvegicus: 2) during the period of a year and ration of captured rats to trap was about 8%. The dominant species of T-mite in all the surveyed areas were Leptotrombidium pallidum and L. palpale and the total number collected was 5782.9 with one family, two genra, eight species. The density of T-mites that collected from rats in three areas(Nodongri, Hatanbangri, Kyochonri) appeared $743.3{\pm}80.4,\;847.2{\pm}86.2\;and\;869.6{\pm}86.4,\;and\;in\;soil\;149.5{\pm}13.9,;154.7{\pm}14.7\;and\;182.4{\pm}20.8$ respectively. On the whole, the number of T-mite that collected from the rats was about three times as much as it in soil. The comparison of individual number of T-mite per a rat collected in three surveyed sites(A,B and C) showed 126.7, 243.1, 258.6 and per $2,000cm^3$ of soil 12.7, 12.7, 54.6, 103.5 respectively. In other word, the number of T-mite at site A and B is smaller than that at area C, thus comparing habitats of three sites each other, C is better living environment of rat and mite than that of A or B. Seasonl occuarance of t-mite that is from rat gradually was increased toward winter and showed the peak to January, and decreased since March but it in soil was inverse proportion to it from rats, because the larvae of T-mite that was hatched in soil was transmited to host in order to suck the body fluid.

• 사물인터넷융복합논문지
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• 제9권1호
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• pp.41-47
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• 2023

오늘날, 세계 인구성장률의 증가로 국제사회는 심각하게 식량문제 해결을 논의하고 있다. 식량문제 해결을 위한 대안으로는 양식산업이 대두되고 있다. 최근 양식산업의 혁신성장을 위해 4차 산업기술을 융합한 스마트 양식장이 보급되고 있으며, 전주기적 디지털화가 추진되고 있다. 양식산업에서 중요한 수질센서는 전기화학방식의 휴대용 센서를 사용하고 있으며, 이를 이용하여 개별적, 간헐적으로 수질을 체크하고 있어서 양식장 수질을 실시간 분석하고 관리하기가 불가능하다. 최근 광학 기반의 모니터링이 가능한 수질센서들이 개발되어 현장에 적용되고 있다. 그러나 수질센서의 상태정보를 알 수 없기 때문에 모니터링 데이터의 신뢰성을 보장할 수 없는 상황이다. 따라서, 본 논문에서는 데이터의 신뢰성을 확보할 수 있도록, 수질센서가 수집하는 모니터링 데이터를 기반으로 고장, 기준일탈, 유지보수, 점검 등의 수질센서 자가진단 상태를 파악할 수 있는 알고리즘을 제안한다.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2022년도 학술발표회
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• pp.471-471
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• 2022

도시화로 인한 하천 건천화가 심각해짐에 따라 생태계 종 다양성 감소와 서식처 파괴 등 다양한 생태학적 문제가 발생한다. 건강한 하천 생태계를 유지하기 위해서는 유량 감소로 인한 수생태계 건강성 회복을 위해서는 어류 종에 따른 적합한 생태 유량을 산정해야 한다. 특히 발전방류로 인한 유량 변화는 하류에 서식하는 어류에 직접적인 영향을 미치므로 댐 방류량에 의한 서식처 면적 변화에 대한 연구가 필요하다. 이에 본 연구에서는 1) 낙동강 상류 구담교 유역을 대상으로 안동댐과 임하댐 유입량을 활용한 BBM (Building Block Methodology)을 구축하고, 2) 대상 하천의 River2D 모형을 구축하여, 3) 대표·대리 어종에 대한 자연유황과 BBM에 따른 가중가용면적(Weighted Usable Area, WUA)을 산정하였다. 2006년 ~ 2020년 자료를 기반으로, 시나리오1은 실측 유량을 활용하였으며, 시나리오2는 전체기간, 홍수년, 갈수년 그리고 평수년으로 구분하여 댐 유입량을 기반으로 산정한 BBM을 활용하였다. 시나리오 분석 결과, 가중가용면적이 감소하는 일부 기간도 존재하였으나, 전반적으로 BBM을 반영한 시나리오 2에서 서식처 면적이 증가하는 것으로 나타났다. 대표 어종 피라미의 경우 최대 약 18% 가중가용면적이 감소하는 기간이 존재하였으나, 최대 79%의 서식처 향상 효과가 나타났다. 대리어종 모래무지의 경우 마찬가지로 최대 약 18%의 서식처 감소 효과가 나타나는 기간이 존재하였으나, 최대 78%의 서식처 향상 효과가 나타나는 것으로 나타났다. 따라서 자연유황을 모방하여 댐 방류 패턴을 변경하는 것이 하류에 서식하는 어류의 서식처 개선에 더 효과적인 것으로 판단된다. 다만 서식처에 영향을 주는 물리적 요인(댐 방류량 등) 외에도 생물·화학적 요인이 존재하므로, 향후 다양한 요인을 고려한 연구를 통해 효과적인 서식처 개선 방안을 모색할 수 있을 것으로 기대된다.

• Nutrition Research and Practice
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• 제18권2호
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• pp.257-268
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• 2024

BACKGROUND/OBJECTIVES: This study investigated the relationship between adherence to the Mediterranean diet among Korean baby boomers and their levels of psychosocial stress. SUBJECTS/METHODS: The study included 1,656 adults (889 men and 797 women) born between 1955 and 1963 who participated in the 2005-2006 survey of the community-based Korean Genome and Epidemiology Study (KoGES). The Mediterranean-type diet score (MTDS) was calculated from the semi-quantitative food frequency questionnaire (SQFFQ) data. The psychosocial stress levels were calculated using the psychosocial well-being indexshort form (PWI-SF). Logistic regression analyses were performed to analyze the association between the MTDS (tertiles) and the prevalence of high psychosocial stress by gender. RESULTS: The ranges of the MTDS tertile groups were T1 (20-33 points), T2 (34-37 points), and T3 (38-39 points) for men, T1 (20-33 points), T2 (34-37 points), and T3 (38-48 points) for women. In both men and women, the consumption of whole grains, potatoes, fruits, vegetables, legumes, and fish increased with higher MTDS, while the consumption of red meat and dairy products decreased (P for trend < 0.05). As MTDS score increased the intake of energy, fiber, vitamins, and minerals (P for trend < 0.05). Men in the highest MTDS tertile had a 41% lower odds ratio (OR) of high psychosocial stress compared with those in the lowest tertile (OR, 0.59; 95% confidence interval [CI], 0.38-0.91). Similarly, women in the highest tertile of the MTDS had a 39% lower OR of high psychosocial stress compared with those in the lowest tertile (OR, 0.61; 95% CI, 0.40-0.95). CONCLUSION: Promoting adherence to the Mediterranean diet among baby boomers may have a positive impact on reducing their levels of psychosocial stress.