• 한국작물학회지
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• 제61권2호
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• pp.113-118
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• 2016

기장의(Panicum miliaceum L.)의 간척지 재배가능성을 확인하기 위해 토양염농도에 따른 기장의 생육 및 개체내 무기영양분의 변이를 새만금 간척지의 대표토양인 문포통토양(미양질)을 이용하여 시험한 결과는 다음과 같다. 토양염농도 증가시 생육감소정도는 종실> 뿌리건물중> 줄기건물중> 간장> 분얼수> 줄기두께> 이삭길이 순을 나타냈다. 종실 결실량은 Control 토양에서 재배된 개체에 비해 토양염농도 $1.6dS\;m^{-1}$에서 재배된 개체의 결실량이 18.9%가 감소되었고 $3.2dS\;m^{-1}$에서는 46.9%, $4.8dS\;m^{-1}$에서는 87.9%가 감소되었다. 뿌리건물중은 토양염농도 $3.2dS\;m^{-1}$에서는 35.8%가 감소되었으며, $4.8dS\;m^{-1}$에서는 60.5% 감소되었다. 식물체 부위별 무기양분 함량은, T-N은 염농도가 증가됐을 때 지상부와 뿌리 종실 모두에서 함량이 증가되었으나 양이온 중 CaO, $P_2O_5$, $K_2O$, MgO는 재배토양의 염농도에 따른 차이를 보이지 않았다. $Na_2O$ 축적량은 뿌리>지상부>종실 순으로 높았으며, 뿌리의 경우 토양염농도 $4.8dS\;m^{-1}$에서 재배된 $Na_2O$함량은 1.02%까지 높아졌다. 종실의 $Na_2O$ 함량은 $1.6dS\;m^{-1}$까지는 Control ($0.8dS\;m^{-1}$)에서 재배된 것과 비슷했다. 이 시험이 결과 경제성을 고려한 기장 재배한계 염농도는 $1.6dS\;m^{-1}$ 내외로 생각되며, 간척지 토양에서 생산된 종실도 식용이 가능함을 제시하였다.

• Applied Biological Chemistry
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• 제9권
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• pp.119-124
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• 1968

묘대(苗垈) 가리시용(加里施用) 시기(時期) 및 시용량(施用量)의 차이(差異)가 수도(水稻)의 근생장(根生長) 및 후기생육(後期生育)에 미치는 영향(影響)을 알고저 수도품종(水稻品種) "재건(再建)"을 공시(供試)하여 pet 시험(試驗)을 하였다. 시험처리(試驗處理)로써는 파종(播種) 직전(直前)과 파종(播種) 후(後) 30일(日)에 각각(各各) 염화가리(鹽化加里)를 $0{\sim}100gK_{2}O/3.3m^2$ 율(率)로 시용(施用)하고, 40일묘(日苗)를 1 주일(週日) 간격(間隔)으로 3회(回)에 걸쳐 계속 전근(剪根) 후(後) 재식(栽植)하고 각각(各各) 주일(週日) 후(後)에 발근상태(發根狀態) 및 그밖의 실용형질(實用形質)에 대(對)하여 조사(調査)하였으며, 제(第) 3 회(回) 전근(剪根) 후(後) 일부(一部)는 완전재식(完全栽植)하여 수량형질(收量形質)에 관(關)하여 조사(調査)하였다. 그 결과(結果)는 다음과 같다. 1. 성묘율(成苗率)은 가리(加里)를 기비(基肥)로 소량(小量) 시용(施用)한 경우에 높았으며, $75gK_{2}O/3.3m^2$ 이상(以上) 시용구(施用區)에서는 현저(顯著)히 감소(減少)하였다. 2. 성묘(成苗)의 초장(草長), 경수(莖數), 엽수(葉數) 및 묘중(苗重)은 모두 가리시용량(加里施用量)의 증가(增加)에 따라 증대(增大)되었으나 기비(基肥)로 시용(施用)한 경우에는 $50gK_{2}O/3.3m^2$, 묘대말기(苗垈末期)의 시용(施用)에 있어서는 $75gK_{2}O/3.3m^2$를 정점(頂點)으로 감소(減少)하였다. 3. 가리시용량(加里施用量)이 많을 수록 전근(剪根) 후(後)의 발근수(發根數)가 현저(顯著)히 증가(增加)되었고 전근(剪根)을 거듭할수록 이러한 경향(傾向)은 더욱 뚜렷하였으며, 대체(大體)로 그 한계시용량(限界施用量)은 $50{\sim}75gK_{2}O/3.3m^2$ 정도(程度)이었다. 4. 전근(剪根) 후(後) 신생근(新生根)의 최장근장(最長根長)도 통계적(統計的) 유의차(有意差)는 없지만 발근수(發根數)와 비슷한 경향(傾向)을 보였다. 5. 전근묘(剪根苗)의 초장(草長), 경수(莖數) 및 지상부(地上部)와 근부(根部)의 중량변이(重量變異)도 발근수(發根數)와 동조적(同調的) 경향(傾向)이었다. 6. 수수(穗數), 정조량(精租量) 및 고중(藁重)은 처리간(處理間) 차이(差異)는 크지 않지만 역시(亦是) 이앙묘(移秧苗)의 생육상(生育狀)과 동조적(同調的) 경향(傾向)을 보이고 묘대(苗垈) 가리시용량(加里施用量)의 증가(增加)에 따라 삼소(參少) 증대(增大)되었으나 $100gK_{2}O/3.3m^2$ 처리구(處理區)에서는 무처리구(無處理區)와 비슷한 정도(程度)로 감소(減少)되었다.

• Journal of Plant Biotechnology
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• 제33권2호
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• pp.133-137
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• 2006

Evaluation of physiological performance of trehalose-producing transgenic rice line was conducted to investigate drought tolerance at early growth stage. Under artificially induced drought condition of 8% polyethylene glycol 6000, this transgenic rice line had leaf photosynthetic rate of 11.08 uml CO$_2$ $m^{-2}s^{-1}$, leaf transpiration rate of 8.38 mmol $H_2O$ $m^{-2}s^{-1}$ and leaf water potential of -1.12 MPa after 96 hours of treatment. Nakdongbyeo, the parent of this tyansgenic rice line, had photosynthetic rate of 15.42 $\mu$mol CO$_2$ $m^{-2}s^{-1}$, leaf transpiration rate of 8,04 mmol $H_2O$ $m^{-2}s^{-1}$ and leaf water potential of -0.88 MPa. The other variety used in this experiment for comparison, IR 72, showed higher values than both tyansgenic rice line and variety Nakdonbyeo on all three parameters; leaf photosynthetic rate of 20.61 $\mu$mol CO$_2$ $m^{-2}s^{-1}$, leaf transpiration rate of 12.88 mmol $H_2O$ $m^{-2}s^{-1}$, and leaf water potential of -0.82 MPa. So this transgenic rice line did not show superior performance in leaf transpiration rate, leaf photosynthetic rate and leaf water potential compared to variety Nakdongbyeo. This result along with visual observation on leaf rolling and drying during the experimental period indicated poor physiological performance of this transgenic rice line. Further studies on metabolic status of stress-induced trehalose, along with study on physiological response of this transgenic rice line during drought stress would shed more light on overall physiological performance of this transgenic rice line.

• International Journal of Industrial Entomology and Biomaterials
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• 제8권1호
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• pp.67-71
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• 2004

Ten improved mulberry varieties (Vl, C1730, C2016, C2017, Anantha, RFS-175, Thallaghatapura, Vishala, S1 and S1635) were evaluated through enzyme assay and estimation of soluble protein content followed by regression analysis, grown under irrigated conditions in the alluvial soils of Gangetic plains of West Bengal in India for five successive crops in a year, The nitrate reductase (EC No. 1.6.6.1) activity (NRA, $\mu$mol N $O_2$- $h^{-1}$ $g^{-1}$ fr, wt.), total soluble protein (mg $g^{-1}$ fr, wt.) was estimated which showed to vary significantly in the tested varieties. In addition to these, the other parameters like unit leaf fresh and dry weight (g), moisture ％, unit leaf area ($\textrm{cm}^2$), specific leaf weight (g c $m^{-2}$ ), total soluble sugar (mg $g^{-1}$ fr, wt.), leaf yield/plant (kg), shoot yield/plant (kg) and net photosynthetic rate (NPR, $\mu$㏖ $m^{2}$ $s^{-1}$ ) were also studied which showed to vary significantly in tested varieties. Among them, S1635, haying higher NRA (13.25 $\mu$㏖ N $O_2$- $h^{-l}$ $g^{-1}$ fr, wt.), total soluble protein (39.63mg $g^{-1}$ fr, wt.), NPR(16.66 $\mu$㏖ $m^{-2}$ $s^{-1}$ ), total soluble sugar (48.44 mg $g^{-1}$ fr. wt.), leaf yield/plant (0.689 kg) and shoot yield/plant (1.135 kg) showed its superiority over other tested varieties. Regression and correlation coefficients were analysed, and a strong positive correlation was found between NRA ＆ total soluble protein, NRA ＆ NPR, NRA ＆ total soluble sugar, NRA af unit leaf weight, NRA ＆ specific leaf weight, NRA ＆ leaf yield/plant, NRA ＆ shoot yield/plant, NPR ＆ leaf yield and NPR ＆ specific leaf weight.t.

• Molecules and Cells
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• 제23권1호
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• pp.72-79
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• 2007

Demand for low-input sustainable crop cultivation is increasing to meet the need for environment-friendly agriculture. Consequently, developing genotypes with high nutrient use efficiency is one of the major objectives of crop breeding programs. This study was conducted to identify QTLs for traits associated with physiological nitrogen use efficiency (PNUE). A recombinant inbred population (DT-RILs) between Dasanbyeo (a tongil type rice, derived from an indica ${\times}$ japonica cross and similar to indica in its genetic make-up) and TR22183 (a Chinese japonica variety) consisting of 166 $F_8$ lines was developed and used for mapping. A frame map of 1,409 cM containing 113 SSR and 103 STS markers with an average interval of 6.5 cM between adjacent marker loci was constructed using the DT-RILs. The RILs were cultivated in ordinary-N ($N-P_2O_5-K_2O=100-80-80kg/ha$) and low-N ($N-P_2O_5-K_2O=50-80-80kg/ha$) (100 kg/ha) conditions. PNUE was positively correlated with the harvest index and grain yield in both conditions. Twenty single QTLs (S-QTLs) and 58 pairs of epistatic loci (E-QTLs) were identified for the nitrogen concentration of grain, nitrogen concentration of straw, nitrogen content of shoot, harvest index, grain yield, straw yield and PNUE in both conditions. The phenotypic variance explained by these S-QTLs and E-QTLs ranged from 11.1 to 44.3% and from 16.0% to 63.6%, respectively. The total phenotypic variance explained by all the QTLs for each trait ranged from 35.8% to 71.3%, showing that the expression of PNUE and related characters depends signify- cantly upon genetic factors. Both S-QTLs and E-QTLs may be useful for marker-assisted selection (MAS) to develop higher PNUE genotypes.

• Nuclear Engineering and Technology
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• 제55권8호
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• pp.3046-3053
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• 2023

Radon is a naturally occurring carcinogenic agent, poses a serious health hazard when inhaled or ingested in significant amounts. The water of the Padma river will be used as a tertiary coolant for the soon-to-be-commissioned 'Rooppur Nuclear Power Plant'. Hence, it is important to assess the radiological status of the river prior to the commission of this power plant. Therefore, for the first time, 25 samples of water were collected from various locations of the Padma River and analyzed for radon concentration using the RAD H₂O (DURRIDGE) radon monitoring device. The radon concentrations were found in the range from 0.077 ± 0.036 to 0.494 ± 0.211 Bq/L with a mean of 0.250 ± 0.093 Bq/L. All the concentrations were found to be below the recommended limits of WHO (100 Bq/L) and USEPA (11.1 Bq/L). The mean annual effective dose due to the radon exposure via inhalation and ingestion pathways were 0.638 µSv/y and 0.629 µSv/y, respectively, which were all well below the annual effective dose recommended by WHO (0.1 mSv/y). Since Bangladesh lacks a national safety limit of radon in water, this pioneering study provides baseline data on radon levels for the environment around Rooppur Nuclear Power Plant.

• Journal of Plant Biotechnology
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• 제5권2호
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• pp.131-135
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• 2003

Callus and cell suspension cultures of Eurycoma longifolia Jack were initiated from leaves of different trees. The leaf explant of tree Eu9 produced the most calli and also induced high cell biomass in the cell suspension culture. Optimum production of cell biomass could be initiated in proliferating culture medium with a pH of 5.75 prior to autoclaving. The effects of macronutrient inorganic salts of Murashige and Skoog (MS) liquid medium supplemented with X on production of cell biomass of Eurycoma longifolia were also investigated. The highest cell biomass was produced in MS medium containing macronutrients of $21\;mM\;NH_4NO_3,\;12.25\;mM\;KNO_3,\;3.00\;mM\;CaCl_2.2H_2O,\;0.575\;mM\;MgSO_4.7H_2O$, and $1.83\;mM\;KH_2PO_4$. A new medium labeled as TAM was formulated for the production of Eurycoma longifolia cell biomass in the cell suspension culture.

• Journal of Plant Biotechnology
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• 제3권1호
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• pp.27-31
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• 2001

New types of cytoplasmic male sterility in Brassica species would be very useful for the production of F$_1$, hybrid seeds. Leaves and stems of rapid cycling stock of B.juncea (CrGC4-3) containing Anand CMS were used as experimental materials for plant regeneration from protoplast culture. Very high plant regeneration rate (85%) was found in the Kao & Michayluk medium supplemented with 2 mg/L zeatin, 0.5 mg/L BAP, and 1 mg/L NAA when only leaf, not stem, segments were cultured. Protoplasts were isolated from leaves using mixtures of enzymes (1% Cellulycin, 0.5% Macerozyme) in 0.4 M mannitol and 50 mM $CaCl_2$.$2H_2$O. Mcrocalli induced from protoplasts were transferred to the shoot regeneration medium containing 2 mg/L BAP, 2 mg/L zeatin, and 0.5 mg/L NAA. After 60 days of initial protoplast culture, regenerated plantlets were obtained, acclimatized, transplanted into the pots, and grown up to the flowering stage.

• 한국에너지공학회:학술대회논문집
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• 한국에너지공학회 1996년도 춘계학술발표회 초록집
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• pp.88-96
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• 1996

The characteristic analysis of fly ash generated from a fired power plant using bunker-C oil has been investigated. Ash size distribution by an optical microscopy with image processing technique, morphological shape by a scanning electron microscope(SEM) and microscope, chemical composition by the inductively coupled plasma emission spectrometry(ICP), and resistivity measurement as a function of temperature and moisture content by the resistivity meter are performed. A study of physical, chemical and electrical characteristics of bunker-C fly ash plays an important role of improving the performance of an electrostatic precipitator and protecting air pollution. The samples of bunker-C fly ash for analysis were collected from the electrostatic precipitator hopper of Ulsan Power Plant Unit 1 and Pusan Power Plant Unit 1. Mass median diameter(MMD) of bunker-C fly ash was measured 12.7${\mu}{\textrm}{m}$, while MMD of fly ash generated from the mixture of bunker-C oil(40%) and domestic anthracitic coal(60%) was 25.7${\mu}{\textrm}{m}$. The morphological structure of bunker-C fly ash consisted of fine particles of non-spherical shape. The primary chemical components of bunker-C fly ash were composed of SiO2(2.36%), Al2O3(4.91%), Fe2O3(14.33%) and C(11.84%). Resistivity of bunker-C fly ash was found to be increased with increasing temperature at the range of 100~15$0^{\circ}C$ and was measured 103~104 ohm-cm.

• 한국약용작물학회지
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• 제15권4호
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• pp.246-250
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• 2007

대량 원소의 종류 및 적정 농도의 규명은 식물의 생장뿐 아니라 유용한 2차 대사산물의 생합성량 증가를 위해 필수적이다. 참돌꽃 배양조직에서 salidroside의 생산성을 높이기 위해 기본 배지의 대량 원소의 농도를 달리하였을 때 $KNO_3$는 98.92 mM, $(NH_4)_2SO_4$는 1.01 mM, $NaH_2PO_4{\cdot}2H_2O$는 2.18 mM, $CaCl_2{\cdot}2H_2O$는 2.04 mM, 그리고 $MgSO_4{\cdot}7H_2O$는 1.01 mM 일 때, salidroside의 생산량이 가장 높았다. 또한 이와 같은 무기이온의 농도를 조합한 $S4B_5$배지에서 기본배지인 $2XB_5$배지에 비해 2.5배 salidroside 함량 증가를 확인할 수 있었다.