Characterizations of Yields and Seed Components of Sesame (Sesamum indicum L.) as Affected by Soil Moisture from Paddy Field Cultivation

전현정,정기열,최영대,이상훈,김성업,오은영 한국토양비료학회 2017 한국토양비료학회지 Vol.50 No.5

Accurate and optimal water supply to cereal crop is critical in growing stalks and producing maximum yields. Recently, upland crops are cultivated in paddy field soils to reduce overproduced rice in Korea. In order to increaseproductivity of cereal crops in paddy fields which have poor percolation and drainage properties, it is necessary tofully understand crop response to excessive soil water condition and management of soil drainage system in paddyfield. The objectives of this study were to investigate effects of excessive soil water to sesame growth and toquantify stress response using groundwater levels. Two cultivars of sesame were selected to investigate; Gunbakand Areum. These sesames were planted in paddy fields located in Miryang, Gyeongnam with different soildrainage levels and drainage systems. The experiment site was divided into two plots by drainage class; verypoorly and somewhat poorly drained. Two different drainage systems were applied to alleviate excessive soilwater in each plot: open ditch and pipe drainage system. Soil water contents and groundwater levels weremeasured every hour during growing season. Pipe drainage system was significantly effective to alleviate wetinjury for sesame in paddy fields. Pipe drainage system decreased average soil moisture content and groundwaterlevel during sesame cultivation. This resulted in greater yield and lignan contetns in sesame seeds than ones fromopen ditch system. Comparison between two cultivars, Gunbak had greater decrease in growth and yield byexcessive soil water and high groundwater level than Areum. Seed components (lignan) showed decrease in seedsas soil water increased. When soil moisture content was greater than 40%, lignan content tended to decrease thanones from less soil moisture content. Based on these results, pipe drainage system would be more effective toreduce wet injury to sesame and increase lignan component in paddy field cultivation.

Review of Soil Structure Quantification from Soil Images

전현정,Daniel Gimenez,윤성원,박찬원,문용희,손연규,현병근 한국토양비료학회 2011 한국토양비료학회지 Vol.44 No.3

Soil structure plays an important role in ecological system, since it controls transport and storage of air, gas,nutrients and solutions. The study of soil structure requires an understanding of the interrelations and interactions between the diverse soil components at various levels of organization. Investigations of the spatial distribution of pore/particle arrangements and the geometry of soil pore space can provide important information regarding ecological or crop system. Because of conveniences in image analyses and accuracy,these investigations have been thrived for a long time. Image analyses from soil sections through impregnated blocks of undisturbed soil (2 dimensional image analyses) or from 3 dimensional scanned soils by computer tomography allow quantitative assessment of the pore space. Image analysis techniques can be used to classify pore types and quantify pore structure without inaccurate or hard labor in laboratory. In this paper, the last 50years of the soil image analyses have been presented and measurements on various soil scales were introduced,as well. In addition to history of image analyses, a couple of examples for soil image analyses were displayed. The discussion was made on the applications of image analyses and techniques to quantify pore/soil structure.

Synthesis and characterization of biodegradable amphiphilic block copolymers via a combination of cobalt-mediated radical polymerization and ROP

전현정,유영창,박동민,육지호 한국고분자학회 2010 한국고분자학회 학술대회 연구논문 초록집 Vol.2010 No.4

ATRP를 이용한 광가교성 블록공중합체의 합성

전현정,김문희,박철민,김중현,육지호 한국공업화학회 2006 한국공업화학회 연구논문 초록집 Vol.2006 No.-

Development of theragnosis system using SPION-βCD-pPTX nanoparticles

전현정,김지훈,김원종 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1

Although various anticancer drugs have been developed, their successful treatments are still far off due to the unintended effects on normal cells. Thus, we have developed efficient drug delivery system for cancer therapy by utilizing polymerized paclitaxel(pPTX), beta-cyclodextrin( βCD) and superparamagnetic iron oxide nanoparticle(SPION). Though PTX is a well-known anticancer drug on variable cancers, it has poor solubility in blood. In order to overcome this problem, we employ host-guest interaction between βCD and pPTX. In addition, SPION was utilized for magnetic-guided delivery method which improve drug targeting efficiency. SPION is prepared by using co-precipitation method and polymer-conjugated paclitaxel is developed according to the previously reported method by our group. The drug-conjugated-nanoparticle formation was confirmed and its biocompatibility was evaluated.

Synthesis of monodisperse water-dispersible hairy PAN nanoparticles via dispersion polymerization acrylonitrile using poly-cobalt complex

전현정,윤민지,이경민,육지호 한국고분자학회 2010 한국고분자학회 학술대회 연구논문 초록집 Vol.2010 No.4

Computer Tomography as a Tool for Physical Analysis in an Anthropogenic Soil

전현정,박찬원,손연규,조현준,현병근,송관철,장용선 한국토양비료학회 2013 한국토양비료학회지 Vol.46 No.6

Human influence on soil formation has dramatically increased as the development of human civilization andindustry. Increase of anthropogenic soils induced research of those soils; classification, chemical and physicalcharacteristics and plant growth of anthropogenic soils. However there have been no reports on soil poreproperties from the anthropogenic soils so far. Therefore the objectives of this study were to test computertomography (CT) to characterize physical properties of an anthropogenic paddy field soil and to finddifferences between natural and anthropogenic paddy field soils. Soil samples of a natural paddy field weretaken from Ansung, Gyeonggi-do (Ansung site), and samples of an anthropogenic paddy field were fromGumi in Gyeongsangnam-do (Gasan) where paddy fields were remodeled in 2011-2012. Samples were takenat three different depths and analyzed for routine physical properties and CT scans. CT scan provided 3dimensional images to calculate pore size, length and tortuosity of soil pores. Fractal analysis was applied toquantify pore structure within soil images. The results of measured physical properties (bulk density, porosity)did not show differences across depths and sites, but hardness and water content had differences. Thesedifferences repeated within the results of pore morphology. Top soil samples from both sites had greater porenumbers and sizes than others. Fractal analyses showed that top soils had more heterogeneous pore structuresthan others. The bottom layer of the Gasan site showed more degradation of pore properties than ploughpanand bottom layers from the Ansung site. These results concluded that anthropogenic soils may have moredegraded pore properties as depth increases. The remodeled paddy fields may need more fundamentalremediation to improve physical conditions. This study suggests that pore analyses using CT can provideimportant information of physical conditions from anthropogenic soils.

성인 특발성 중추성 요붕증의 임상적 경과

전현정,박순희,권성희,이선화,박경수,김성연,이홍규 대한내분비학회 2001 Endocrinology and metabolism Vol.16 No.2

Background: Idiopathic Central Diabetes Insipidus in children or adolescents requires a frequent follow-up regimen using serial brain MRI and CSF examinations especially if an isolated pituitary stalk thickening or loss of a hyperintense signal in the posterior pituitary lobe is observed. Although a detailed description has not been made in adults who had Idiopathic Central Diabetes Insipidus, the clinical course of a Central Diabetes Insipidus in children or in adolescents can not be applied to adults because a follow-up study is so invasive and expensive. In this report, we evaluated the clinical course of Idiopathic Central Diabetes Insipidus in adults. Methods: The diagnosis of Idiopathic Central Diabetes Insipidus was based on the presenting clinical symptoms, the water deprivation test, biochemical studies and a brain MRI. We measured the urine specific gravity, urine and plasma osmolarity, electrolytes, and daily urine amount and we also performed an anterior pituitary evaluation. Patients had contrast-enhanced MRI and biochemical studies every 4 to 12 months. Results: The patients included 8 females and 4 males. Their ages ranged from 20 to 76 years and their mean age was 45±17 years. Tumor markers in the CSF were not detected any of the patients. An anterior pituitary evaluation showed that four patients had hyperprolactinemia, and five patients had impaired secretory responses of Growth Hormone to an insulin induced hypoglycemia. Nine of the 12 patients had thickening of the pituitary stalk, seven had lacked the hyperintense signal of a normal neurohypophysis. The abnormalities of MRI disappeared in 3 patients by the 4th, 27th and 36th month follow up periods, respectively. The follow up duration was between 8 months and 11 years 3 months and the mean follow up duration period was 50.6±45.5 months. Clinical symptoms were corrected by DDAVP administration. Other symptoms were absent. Conclusion: In our study, of Idiopathic Central Diabetes Insipidus in adults there were no observed germinomas or other disease that were observed. Therefore this disorder may have a benign course

Growth Characteristics and Physiological Responses of Soybean (Glycine max L.) under Excessive Soil Moisture Stress

전현정,이상훈,공동혁,김원찬,이상협,정기열 한국토양비료학회 2022 한국토양비료학회지 Vol.55 No.3

Due to global climate change and poor drainage soil characteristic in paddy fields, soybeans which are one ofmain upland crops in Korea are prone to get stressed by excessive soil moisture during cultivation. Excessivesoil moisture stress causes poor growth, yield loss, and disease to soybeans. In order to prevent damages byexcessive soil moisture stress, it is important to understand responses of soybeans under excessive soil moisturecondition. Therefore, this study investigated morphological and physiological responses of soybeans byexcessive soil moisture at various growth stages; V2, R1, R3, R5 and whole growing period. Soybeans wereplanted and characteristics of photosynthesis, chlorophyll fluorescence and 1-Aminocyclopropane-1-carboxilicacid (ACC) were measured from leaves after excessive soil moisture treatment. After harvest, growth and yieldcomponents were measured. As a result, soybean showed the smallest stalk height from soybeans which hadexcessive soil moisture at V2 and whole growing period. On the other hand, the greatest yield loss occurredwhen excessive soil moisture applied at R5, while the smallest at R2 and whole growing period. Soybean leavesshowed the smallest photosynthetic rate and stomatal conductance under excessive soil moisture condition. These decline continued at least 1 week and restored to the values of photosynthetic rate and stomatal conductancefrom soybeans with no stress. Soybeans under excessive soil moisture exhibited greater ACC values thanone of no stress. These increment of ACC continued 2 weeks and diminished. Soybeans treated with excessivesoil moisture at V2, R1, R3 and whole growing period had decrease in photosynthetic rate and increase in ACCvalues. These results can indicate that changes of ACC contents in soybean leaves may be used as indicator ofexcessive soil moisture stress.

Root Growth and Spatial Distribution Characterization of Soybean (Glycine max L.) and Adzuki Bean (Vigna angularis L.) Under Drought Stress

전현정,정기열,최영대,이상훈,강항원 한국토양비료학회 2019 한국토양비료학회지 Vol.52 No.4

Recently Korea has severe drought during sowing and early vegetative period of soybean and adzuki beancultivation. Soybean and adzuki bean are an important legume crops in Korea, so it is important to understandadaptation of these crops to water stress. This study investigated changes of morphological properties and spatial distribution of soybean and adzuki bean roots under different soil moisture contents. The experiment was performed at National Institute of Crio Science in Miryang. Soybeans and adzuki beans were planted in a test tube with 40 in length, 20 in width, and 4 cm in depth and grew for 20 days. The tubes were filled with turface soil with six soil moisture treatments (30, 40, 50, 60, 70 and 100%). The root images were obtained every 2 days using a scanner. Root properties from the images were characterized by root length, depth, surface area, number of roots and fractal parameters (fractal dimension and lacunarity). The root depth, length, surface area and number of roots increased as soil moisture increased from both crops. The values of fractal dimension and lacunarity increased as soil moisture increased. These results indicated that greater soil moisture induced more heterogeneous root structure. Correlation analysis among morphological properties and fractal parameters resulted in that the fractal dimension had the greatest correlation with depth, number of roots and surface area from soybean. Lacunarity from soybean showed a greater correlation with number of roots and surface area than ones from adzuki bean. This result indicates that fractal dimension is strongly related to branching of roots. Soybean and adzuki bean are sensitive to soil moisture content in early vegetative stage and they require soil moisture greater than 70% to develop full root structure. These results would be useful to understand soybean and adzuki bean responses to water stress and to manage irrigation amounts in cultivation.