• 한국토양비료학회지
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• 제17권3호
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• pp.218-223
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• 1984

비료성분(肥料成分)의 집적(集積)이 높은 시설원운지(施設園芸地) 토양(土壤)을 공시(供試)하여 투수속도(透水速度)를 조절(調節)하면서 삼강(三剛)벼를 폿트 재배(栽培)하고 양분이동(養分移動) 및 수량(收量)과의 상관(相關)을 구(求)하였다. 수용성(水溶性) 양분수지(養分收支)는 투수속도(透水速度)가 빨라질수록 규산(珪酸) 및 석회(石灰)는 손실량(損失量)이 많아졌지만 가리(加里) 및 암모니아태(態) 질소(窒素)는 집적량(集積量)이 많아졌다. 무투수구(無透水區)에 비(比)하여 투수구(透水區)에서 생육후기(生育後期)의 근활력(根活力)이 현저(顯著)히 높아진 반면(反面)에 수확후(收穫後)의 토양(土壤) 염농도(鹽濃度)는 낮아졌다. 식물체(植物體)에 의(依)한 질소(窒素), 인산(燐酸), 가리(加里) 및 고토(苦土)의 흡수량(吸收量)은 투수속도(透水速度)에 비례(比例)하여 점증(漸增)되었지만 규산(珪酸)은 10mm/day에서 최대(最大)로 되었다. 대수회귀식(對數回歸式)에서 상대수량(相對收量) 95~100%를 얻을 수 있는 투수속도(透水速度)는 5~10mm/day였고 이 범위(範圍)가 다수확(多收穫)을 위(爲)한 적정(適正) 투수속도(透水速度)라고 생각된다.

• 한국토양비료학회지
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• 제43권3호
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• pp.384-389
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• 2010

Outbreak of contagious diseases to livestock animals is becoming prevalent worldwide and consequently, tremendous numbers of the infected or culled stocks are buried on the ground as the most common disposal method. The buried animals can generate a wide range of detrimental components such as leachate, nutrient salts, and pathogenic bacteria, consequently contaminating the surround environment. This implies that regular investigations are required to monitor any possible detrimental environmental aspect occurred around burial sites. Therefore, the current study was conducted to investigate whether the soil and groundwater nearby the burial sites had been contaminated by the substances originated from the burial sites, which can be applied for the establishment of the ideal burial site construction design and post management scheme. For this, two different burial sites located in Cheonan and Pyeongtaek were selected. Cheonan and Pyeongtaek sites were constructed in 2004 and 2008, respectively and both contained dead poultry infected by avian influenza (AI). Soil and groundwater samples were collected around the sites followed by determination of the nutrient concentrations and bacteria (Salmonella, Camphylobacter, and Bacillus) existence in both soil and groundwater. Some of the soil samples showed higher EC, $NH_4$-N, $NO_3$-N concentration compared to those of the background (control) soils. Also the concentration of $NH_4$-N in some of the groundwater samples appeared to exceed the USEPA guideline value for drinking water (10 mg $L^{-1}$). These results indicated that the soil and groundwater were influenced by the burial site originated nutrients. In the soil, Bacillus was isolated in most soil samples while there were no detections of Salmonella and Camplylobacter. Due to the Bacillus existing mainly as a spore in the soils, it was considered that the frequent detection of Bacillus in the soil samples was attributed to the nutrients originated from the burial sites.

• 생명과학회지
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• 제21권11호
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• pp.1599-1606
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• 2011

유류분해에 있어 혼합미생물제제의 효과를 평가하기 위해 미생물제제의 처리성능과 microcosm test를 수행하였다. 유류분해세균은 0.5% Arabian heavy crude oil을 유일 탄소원으로 제공된 최소배지를 이용한 연속적인 농후배양을 통하여 분리하였다. 우수 유류분해 미생물조합인 3종의 균주(BS1, BS2, BS4)는 MSM배지에서 5일의 배양기간 동안 지방족 탄화수소를 48.4%, 방향족 탄화수소를 30.5% 생분해하였다. 처리성능 및 microcosm test는 Arabian heavy crude oil을 첨가한 후 3가지 처리조건인 무처리, 무기영양염처리 그리고 무기영양염 및 혼합미생물처리조건에서 유류화합물의 생물분해에 미치는 영향을 조사하였다. 무기영양염처리구와 무기영양염 및 혼합미생물처리구에서 지방족 탄화수소의 분해율은 실험기간 동안 유의하게 향상되었으며 두 실험구간 유의한 차이는 관찰되지 않았다. 그러나 무기영양염 및 혼합미생물처리구에서 방향족 탄화수소의 생분해율은 무기영양염제만을 처리한 시험구와 비교하여 처리성능 시험의 경우 50% 그리고 microcosm test의 경우 13%를 향상시켰다. 본 연구의 결과로부터 혼합미생물제제는 실험실, 처리성능 및 microcosm test에서 지방족뿐만 아니라 방향족 탄화수소의 생물분해를 촉진하였다. 특히 혼합미생물제제는 방향족 탄화수소의 제거를 위한 생물정화기술의 적용에 있어 유용한 도구로 판단된다.

• Environmental Sciences Bulletin of The Korean Environmental Sciences Society
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• 제2권2호
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• pp.99-108
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• 1998

Results obtained from this research showed that the anaerobic contact process was applicable to pear waste with COD removal efficiencies of up to $95\%$ depending on conditions, provided ammonium and phosphate salts were added as well as other nutrients, present in the commercial fertilizer, Milorganite or in yeast extract. These latter materials were required in minimum concentrations of 5 and 1.5 g/L, respectively, in the feed independent of HRT and volatile solids loading rate, with part of the effect due to the mineral fraction. Digestion was satisfactory over the whole range of volatile solids loading rates and liquid retention time of 30 to 0.5 days tested, although treatment efficiency dropped off noticeably between 1 and 0.5 day liquid retention time because of poorer flocculation and separation of anaerobic bacteria. Settling of anaerobic bacteria including methane producing bacteria was related to settling of mixed liquor suspended solids only at 1 to 5 days liquid retention times, at other liquid retention times anaerobic microorganism settled markedly less efficiently than mixed liquor suspended solids. Further studies are being made to provide information of practical and basic interest. Data on the composition of the active fraction of yeast extract might solve many practical nutrient problems encountered with the anaerobic contact process and improve its economics. Further improvement in the flocculation and settling of anaerobic bacteria as well as other bacteria would improve overall performance and allow the use of shorter liquid retention times with dilute waste. Knowledge about the numbers of methane formers present would allow a degree of understanding and control of the process not presently attainable.

• 한국작물학회지
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• 제50권5호
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• pp.325-331
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• 2005

Seedlings of two rice genotyopes, cvs. Ilpumbyeo and Gancheokbyeo, were exposed to 0, 50 and 100 mM NaCl in nutrient solution for nine days. Plants were collected at the interval of 3 days and organic and inorganic solutes in leaves and roots and antioxidative enzyme activity in leaves were determined. Under salinity, the accumulation of soluble sugars occurred considerably in the older leaves of stressed seedlings compared to younger leaves and roots. The endogenous Na+ contents markedly increased at higher NaCl concentration in leaves and roots of seedlings, though it was higher accumulated in roots. Salinity resulted in an excessive proline accumulation in the stressed plants. A more pronounced increase was observed in Gancheokbyeo leaves. SOD activity in Impumbyeo cannot found any remarkable change, whereas, in Gancheokbyeo, its activity was rapidly decreased. CAT and POD activities increased with an increase in NaCl concentration in both genotypes. In sum­mary, the high capacity of rice seedlings to overcome an unfavorable growth condition such salt stress appears to be related to an adequate partition of organic solutes between shoots and roots and to changes in absorption, transport and re-translocation of salts.

• 한국미생물·생명공학회지
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• 제13권1호
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• pp.41-49
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• 1985

Bacillus sphaericss 1593균주를 ultra violet light (366nm, 253.7nm)와 dimethyl sulfate으로 처리하여 다수의 감온성 돌연변이체를 분리하여 이중 25균주를 선택하였고 24개의 감온성 돌연변이체는 $42^{\circ}C$의 제한온도에서 전혀 성장을 하지 않았으며, 9개의 감온성 돌연변이체는 제한온도 $42^{\circ}C$에서 허용온도의 성장과 비교하여 1/2정도의 감소를 보였다. 기타 2개의 감온성 돌연변이체는 저온 민감성인 감온성 돌연변이체로서 허용온도($30^{\circ}C$)에서의 성장이 제한온도($42^{\circ}C$) 성장보다 감소를 보였다. 이러한 결과에 따라서 감온성 돌연변이체를 치사군과 비치사군 및 저온민감성 감온성 돌연변이체로 분리할 수 있었다. 또한 치사군의 제한온도에서의 발육은 고체배지 및 액체배지 양쪽에서 성장을 하지 않는 반면 비치사군들의 돌연변이체들은 제한온도 $42^{\circ}C$에서 고체배지 및 액체배지의 성장은 허용온도에서 배양한 결과보다 저조한 성장을 나타내었다. 감온성 돌연변이체들은 $42^{\circ}C$에서 12시간 배양한 후 허용온도인 $30^{\circ}C$ 액체배지로 이식하여 배양한 결과 치사군중 ts-U1112, ts-D1290, ts-D1342, ts-D1504 돌연변이체들은 성장을 계속하지 않았으며, ts-U351, ts-U828, ts-U892, ts-D1350, ts-D1479, ts-D2601과 ts-D2801 돌연변이체들은 성장이 계속됨을 관찰할 수 있었다.

• 한국해양학회지
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• 제5권1호
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• pp.14-29
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• 1970

김의 성장과 품질에 대한 환경수질의 중요성은 다시 말할 필요가 없다 김 양식기에 있어서의 환경수질의 변동을 보기 위해 저자의 한 사람은 섬진강 및 낙동강 하구 김밭에 대해 이미 조사한 바 있거니와 이번에는 우리나라 유수의 김 생산지인 완도군하 김밭의 수질을 전보와 같은 방법으로 조사하였다. 조사지점으로서는 완도군 에서대체로 대표적 김밭이라 볼 수 있는 두 지점을 선정하여 1968년 10월부터 1969년 2월까지 매월 대조일에서의 수질변동을 조수의 일조기에 걸쳐 1시간마다 각 성분량을 측정하므로써 조사하였다.

• 한국물환경학회지
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• 제33권4호
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• pp.409-415
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• 2017

This study aims to evaluate the effect of capping materials on blocking pollutant elution from contaminated sediment to water body. Experiments were carried out under conditions in which the elution rate was intensified artificially using compost with high concentration of organic compound and nutrient salts instead of sediments. Activated carbon (AC), modified activated carbon (MAC), P. putida immobilized activated carbon (PBAC) and effective microorganisms immobilized activated carbon (EBAC) were used as capping materials. Zeolite (ZT) and two kinds of commercially available microorganisms immobilized zeolite products (ZC, ZN) were used for comparison experiment. The elution rate of organic compound, nitrogen and phosphorus were compared with that of control experiment. The experiments were conducted for 56 days. Concentrations of chemical oxygen demand, total nitrogen, and total phosphorus were measured to use the comparison of release rate of organic compound, nitrogen and phosphorus. From the experimental results, AC based materials showed better performance to block the elution of organic compound and nitrogen than ZT based materials. Although ZT based materials were more effective than AC and PBAC to block phosphorus, MAC and EBAC showed the best performance of phosphorus elution blocking among the all candidate materials. In conclusion, EBAC is considered as the most effective capping materials, because organic compound, nitrogen and phosphorus will be degraded continuously by EM in the long term.

• 한국수산과학회지
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• 제7권2호
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• pp.63-68
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• 1974

The growth of sea weeds is greatly affected by the environmental conditions of ambient water. Especially nutrient salts in sea water function as a major factor to the growth of lavers, so that the content of inorganic substances in lavers could he a criterion for quality evaluation of lavers. In this experiment, the relation between the quality and the content of Zinc and Magnesium which are not only physiologically active and closely related with pigments such as chlorophll and phycobilins but also important in quantify is discussed if such a measurement to be an index for quality evaluation. Sixteen samples of layers were collected from three different culture farms, 7 from Jangrim-Busan, 6 from Wando-Jeon Nam, 3 from Hadong-Gyeong Nam, and classified into 3 quality grades to each farm and to whole samples by organoleptic test. Zinc and Magnesium were analyzed by atomic absorption spectrophotometry. For pigment analysis, chlorphyll was extracted with 85 percent acetone, filtered and the absorbance was measured at 660 nm and the residue was further extracted with phosphoric buffer solution to determine the optical density for phycobilins at 560 nm. The result showed that the total content of Zinc and Magnesium varied between the farms, but kept consistent with quality grades from the same farm. The Zinc content was correlated proportion- ally with the content of phycobilins, and Magnesium content in total ash could roughly represent the content of chlorophll except some examples in which the Magnesium content of chlorophyll-ext ractresiduewasexceptionallyhigher. In conclusion the contents of these metals provide an applicable index for quality judgment of lavers.

• 생태와환경
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• 제33권2호통권90호
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• pp.80-108
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• 2000

본 연구는 한국 담수산 Trachelomonas 속을 대상으로 분류학적 이해에 입각한 종속지를 마련하고자 함에 그 목적이 있다. 재료는 1994년 5월부터 1997년 6월 까지 한국 전역의 58 담수계에서 총231회 채집되었다. 총 47 분류군의 분류학적 기재, 그림 및 사진을 제시하였다. 이 중 19 분류군이 한국산 Trachelomonas 종속지에 미기록으로 보고되었고, T. curta var. reticulata, T. koreana, T. planctonica var. papillosa, T. spina는 신종 또는 신 변종으로 기재한다. 따라서 한국산 Trachelomonas 종속지는 기 보고된 23분류군과 더불어 총 70 분류군으로 정리되었다. Trachelomonas 종들은 방죽이나 자연늪 등과 같이 유기물질과 영양염류가 풍부한 오래된 정체수역에서 다양하게 출현하였다. T. bacillifera, T. hispida, T. volvocina는 춘계와 하계에 자연늪이나 양어장에서 대발생하는 경항을 보였다.