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호남지역의 시설원예재배시 지하수중 화학성분 변동요인 조사
이경보,이덕배,이경수 한국환경농학회 1996 한국환경농학회지 Vol.15 No.3
This study was carried out to investigate factors influencing on the groundwater quality at controlled horticulture in Honam area in 1995. The deeper groundwater sampling, the lower concentrations of NH₄-N and NO₃-N were observed. There was no difference in concentrations of SO₄^(2-) and Na^+ in the groundwater below 15m. Contents of NH₄-N, NO₃-N and PO₄^(3-) in groundwater were the highest at rice transplanting season(the late May) and that of SO₄^(2-), Na^+ and Cl^- were the highest at dry season(the mid-February). Continuous cultivation of horticultural crops showed higher concentration of NH₄-N, NO₃-N, PO₄^(3-), Na^+ and Cl^- in groundwater than rotational culture with rice. The longer cultivation years with horticultural crops, the higher concentrations of NO₃-N, PO₄^(3-), SO₄^(2-) and Cl^- were shown, and constitutional ratio of NO₃-N among the anions increased gradually. Nitrate-N level, exceeded 20㎎/ℓ, the critical level for agricultural usage, frequently at Yongjinmyeon Wanju and Janglockdong Kwangju, and PO₄^(3-) levels were higher at Seogtandong Iksan than the other places.
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이경보,이덕배,김백호,최민규,김재덕 한국환경농학회 2000 한국환경농학회지 Vol.19 No.4
본 연구는 1996년과 1997년 3월부터 10월까지 섬진강 수계 총 16지점을 선정하여 수질의 오염성분 및 수계에 서식하는 부착조류의 분포, 생태학적 특성을 조사 분석하였으며, 그 결과는 다음과 같다. 섬진강 수계 농업용수 시기별 수질변화에서 7, 8월에 오염성분 함량이 낮았으며, NO₃^(-)-N는 영농시기인 6월에 그 함량이 다소 높은 경향이었다. 수계별 수질변화에서는 생활하수가 유입되는 구례 서시천, 남원 요천이 EC 함량이 높았고, NO₃-N 함량은 남원 요천에서 높았다. 섬진강 수계 주요 음이온의 당량합은 Cl^->SO₄^(2-)>NO₃^->PO₄^(3-)순 이었으며 양이온의 당량합은 Ca^(2-)>Na^->Mg^(2-)>K^+>NH₄^-순 이었다. 섬진강 부착 조류중 동정 분류된 부착조류는 총 6강 15목 9아목 33과 13아과 90속 290종 42변종 7품종으로 총 339종류였으며, 녹조 171종류, 규조 106종류, 남조 46종류, 유글레나 10종류, 쌍편모조 4종류, 황색편모조 2종류 순이었다. 계절별 조사에서 여름조사에는 219종류로 출현중의 64.6%를 차지하였으나, 겨울은 147종류로 43.4%로 가장 낮은 출현을 보였고, 조사기간동안 산정된 부착조류 현존량은 총 12,240×10⁴ cells L^(-1)(총 현존량의 20.6%)로 최저치를 보였다. 우점종으로는 봄에 Cocconeis placentula var. euglypta, Cosmarium furcatospermum, Melsira granulata 등, 여름에는 Cyclotella meneghinana, Synedra ulna, Scenedesmus ecornis 등, 가을에는 Melsira granulata, Achnanthes minutissma, 겨울에는 Gomphonema parvulum, Cocconeis placentula var, euglypta, Melsira varians 등이 높은 출현을 보였다. 우점도 지수는 전체적으로 0.10 - 0.43의 범위를 보였으며, 지점 2, 4, 8, 9 등에 비교적 낮은 우점도지수를 보였고, 지점 5, 6, 15 등에서 높게 나타났다. This study was carried out to investigate distribution of epilithic algal and chemical contents of irrigation water influencing in the Seomjin River from March to October in 1996 and 1997. In the water quality of the Seomjin River, the monthly average contents of NH₄^+-N, SO₄^(2-) and Cl^- showed the lowest peak in July and August while that of NO₃-N showed the highest peak in June. The water quality of the Seomjin River was deteriorated by inflow of Yo-cheon and Sosi-cheon in the middle stream. The concentration of anions and cations of the Seomjin River was Cl^->SO₄^(2-)>NO₃^->PO₄^(3-) and Ca^(2+)>Na^+>Mg^(2+)>K^+>NH₄^+, respectively. The epilithic algal community identified 339 taxa consisting of 7 forma, 42 varieties and 290 species in 6 classes. In species composition, green algae and diatoms were heavily dominated which were evaluated 50.4% and 31.3% of total classification, respectively. In seasonal distribution, 219 species presented in summer but, 147 species were in winter. In this study, dominant species were Cocconeis placentula var. euglypta and Cosmarium furcatospermum in spering. Cyclotella meneghinasa and Synedra ulna, Scenedesmus ecornis in summer. Melosira varians, Achnathes minutissima in autmnn and Gomphonema parvulum in winter were dominated. Finally, the dominant indices in this study have ranged 0.10-0.43.
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Case report: Imaging of Corpus Callosum Agenesis
이경보,이상호,임성훈 대한신경치료학회 2020 신경치료 Vol.24 No.1
Purpose Agenesis of the corpus callosum (AgCC) is one of several disorders of the structure that connects the two hemispheres of the brain. We describe two patients with AgCC and compare their magnetic resonance imaging (MRI) and diffusion tensor imaging (DTI) findings with those of healthy controls. Methods Two females with AgCC underwent brain MRI. DTI-Studio software (CMRM, Johns Hopkins Medical Institute, MD, USA) was used to reconstruct the corpus callosum (CC) fibers. Results MRI revealed periventricular plaques, complete CC agenesis of corpus callosum, and a residual anterior commissure (AC). In the DTI images of normal subjects, transcallosal fiber tracts were apparent, and formed many more connections to the frontal area than was the case in the patients. Conclusion Early diagnosis and intervention may improve the social and developmental outcomes of patients with AgCC. Symptoms and seizures must be managed. A focus on right/left co-ordination render the condition much more manageable than is otherwise the case.
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이경보,김용웅,김광식,Lee, Kyung-Bo,Kim, Yong-Woong,Kim, Kwang-Sik 한국토양비료학회 1988 한국토양비료학회지 Vol.21 No.2
담수토양(湛水土壤)에서의 농약(農藥)의 처리(處理)가 질산화성균(窒酸化成菌), 질산환원균(窒酸還元菌), 탈질균(脫窒菌), 질산화작용(窒酸化作用), 질소고정미생물(窒素固定微生物) 및 질소고정력(窒素固定力)에 미치는 영향(影響)을 조사분석(調査分析)한 결과(結果)를 요약(要約)하면 다음과 같다. 암모니움산화균(酸化菌)은 농약처리구(農藥處理區)에 있어서 균수(菌數)가 감소하였으며, 아질산산화균(亞窒酸酸化菌)은 cabamate계(系) 살충제(殺蟲劑)인 carbofuran과 MIPC 처리구(處理區)에서 균수(菌數)가 감소하였고 질산환원균(窒酸還元菌)과 탈질균(脫窒菌)은 농약처리구(農藥處理區)가 대조구(對照區)에 비해 균수(菌數)가 감소하였으나 simetryne 처리구(處理區)에 있어서는 배양(培養) 60일(日)경에 탈질균(脫窒菌)이 증가(增加)하는 경향(傾向)이었다. $NO_2{^-}$와 $NO_3{^-}$ 생성량(生成量)은 농약처리(農藥處理)에 의해 경시적(經時的)으로 감소하는 경향(傾向)이었다. azotobacter 속균(屬菌)과 clostridia 속균(屬菌)은 농약(農藥)에 의해 크게 저해받지 않았으며 홍색무황세균(紅色無黃細菌)과 홍색황세균(紅色黃細菌)은 제초제인 simetryne 처리구(處理區)에서 균수(菌數)가 감소하였고 blue-green algae는 acephate 처리구(處理區)에서 균수(菌數)가 증가(增加)하는 경향(傾向)이었다. acetylene 환원력(還元力)은 acephate 처리구(處理區)에서 높은 경향(傾向)을 보였으며 일반적으로 살충제(殺蟲劑)나 제초제(除草劑)의 살포가 토양(土壤)의 질소고정력(窒素固定力)에 크게 영향을 주지는 않는 것 같다. This study was made to investigate the effect of pesticides on microflora to nitrogen metabolism, nitrification and nitrogen fixing activity in the submerged soil. The results are summarized as follows; Pesticides treatment leaded to the inhibition of $NH_4{^-}$-oxdizers, $NO_3{^-}$-reducer, and denitrifying bacteria population. $NO_2{^-}$-oxdizers were inhibited by cabamate compounds, carbofuran and MIPC. Simetryne seemed to stimulate the denitrifying bacteria at 60 days after incubation. Generally, formation of $NO_2{^-}$ and $NO_3{^-}$ tended to decrease by pesticides application. Pesticides application stimulated Azotobacter and Clostridia populations, while simetryne inhibited Athiorhodaceae and Thiorhodaceae. However acephate seemed to be stimulatory to blue-geen algae. $C_2H_2$-reducing activity by acephate was clearly appeared. The change of $C_2H_2$-reducing activity did not seems to be affected by pesticides application.
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