침엽수로부터 발생되는 방향성 테르펜의 배출속도 비교 연구

김조천,홍지형,강창희,선우영,김기준,임준호 한국대기환경학회 2004 한국대기환경학회지 Vol.20 No.2

In order to investigate the composition ratio and the emission rate of monoterpenes emitted from coniferous trees during summer, the enclosure chamber experiments were carried out for two tree species (Pinus densiflora and Pinus rigida). The major monoterpenes from the pine trees were α-pinene, β-pinene, myrcene and β-phellan-drene. There was no difference of the composition ratio between two sites for P. densiflora, but the difference was observed for P.rigida, Clearly, the ratio of β-pinene (26.1%) for P.rigida was higher than that of β-phellandrene (12%) at the Gumsung mountain site, but the ratio of β-phellandrene (22.2%) was higher than that of β-pinene (9.9%) at the Chiri mountain site. Particularly, the composition ratio of β-phellandrene was higher than that of β-pinene for P.densiflora, and the opposite trend was found for P.rigida at the Gumsung mountain site. The characteristics of the composition ratio between two species were similar at the Chiri mountain site. As a result of the emission rate measurements, it was observed that both sites did not show any significant β value (slope between emission rate and temperature) and ERs (Standard Emission rate at 30℃) difference. However, the β value and ERs at the Chiri mountain site were slightly greater than those of Gumsung mountain site for both pine species. P.densiflora(1.703 and 1.971㎍C/gdw/hr) showed the higher monoterpene ERs than those of P.rigida (0.572 and 0.698 ㎍C/gdw/hr) at both sites.

수확 후 꼭지 유지, 제거에 따른 대추형 방울토마토의 품질 및 미생물 변화

최지원 ( Ji Weon Choi ),이우문 ( Woo Moon Lee ),도경란 ( Kyung Ran Do ),조미애 ( Mi Ae Cho ),김창국 ( Chang Kug Kim ),박미희 ( Me Hea Park ),김지강 ( Ji Gang Kim ) 한국식품저장유통학회(구 한국농산물저장유통학회) 2013 한국식품저장유통학회지 Vol.20 No.1

Red-ripe ``Betatiny`` jujube-shaped cherry tomato fruits via stem maintenance or stem removal were stored at 20℃ for 12 days. Their quality and microbial safety parameters like their respiration rate, weight loss, soluble solids content, tiratable acidity, firmness, hue valus, aerobic microflra, coliform, yeast and mold count, and decay were evaluated during their storage. The jujube-shaped cherry tomato fruits whose stems were removed lost less weight than the fruies whose stems were maintained during their 12 days of storage. The stem removal lowered the resporation more significantly than the stem maintenance, and the formation of novel tissues at the stem scar that resulted from the stem removal was observed morphologically. The SSC, TA and hue value of the skin color decreased after eight storage days, but showed no difference between the stem maintenance and removal. The stem had higher microbial counts like aerobic microflora, coliform, and yeast and mold counts. The stem maintenance showed a short shelf-life because molds grew on the attached stem after five storage days. The shelf-life of the jujube-shaped cherry tomato fruits whose stems were removed was about eight days, but that of the fruits whose stems were maintained and that were stored at 20℃ was only about six days.

Changes in Quality of Oriental Melon ‘Smartkkul’ During Vessel Transportation

Ji-Weon Choi,Min-Sun Chang,Ji Hyun Lee,Yoonpyo Hong,Ji Gang Kim 한국원예학회 2018 원예과학기술지 Vol.36 No.4

This study was carried out to assess different postharvest treatments of oriental melon (Cucumis melo var. makuwa Makino) for vessel export to Singapore and to investigate the competitiveness of Korean oriental melon in local markets in Singapore. Oriental melon fruits were grown and harvested from a commercial greenhouse in Seongju, Korea. Oriental melons were treated with 5 different applications: washing with water and 5-kg bulk packaging in a corrugated box covered with polypropylene film (control), washing with water and 5-kg bulk packaging in a corrugated box covered with polyethylene film coated with pegmatite (W+B+F), the W+B+F treatment with the addition of absorption paper (W+B+F+P), washing with water and small packaging, in which two oriental melons were packaged in a polyethylene terephthalate (PET) tray, and 8 trays were placed into each corrugated box (W+S), and washing with 0.5% chitosan solution and small packaging (CW+S). After the treatments, the melon fruits were stored for 1 day at 13°C followed by a 9-day transportation to Singapore at 3°C in a shipping container, and a 3-day distribution to the markets at 18°C. The control treatment resulted in the highest and the fastest weight loss. The W+B+F treatment was effective in reducing surface browning of oriental melon and marketability was the highest at 71.4% with this treatment after arrival in Singapore. The W+S and CW+S treatments showed no decay 3 days after arrival in Singapore. The firmness of W+C+F-treated melon fruit was higher than in the other treatments during distribution at 18°C after export. The soluble solids content of the seed was higher than in the flesh of oriental melon fruit. This study indicated that the W+B+F treatment of oriental melon before export was effective in maintaining freshness during export to Singapore.

Nitrous Oxide Emission from Upland Soil Mulched with Different Type of Plastic Films during Growing Season of Maize

Min Ji Gang(강민지),Chang Oh Hong(홍창오) 한국토양비료학회 2021 한국토양비료학회 학술발표회 초록집 Vol.2021 No.11

Plastic mulching film is often used to cultivate crops in upland soil, because it can control weed and increase crop productivity. However, it may increase the temperature and the moisture content of the soil, resulting in more nitrous oxide (N₂O) emission. The objectives of this study were 1) to compare the effect of different type of plastic mulching films on N₂O emission from upland soil and 2) to select the optimum plastic mulching film to reduce N₂O emission and increase crop yield. Surface soils were mulched with different types of plastic film including clear, permeated, conventional, and non mulching. Maizes were transplanted on 27<SUP>th</SUP> April and harvested on 4<SUP>th</SUP> August in 2020. Nitrous oxide flux peaked soon after applying nitrogen fertilizer and raining. The averaged water filled pore spaces (WFPS) in soil were 73.8, 61.9, 59.5, and 52.1 % with clear, permeated, conventional, and non mulching, respectively. The cumulative N₂O emissions were 4.99, 7.27, 5.35, and 4.08 kg ha<SUP>-1</SUP>, respectively. Changes of WFPS of soil mulched with different types of plastic film affected the cumulative N₂O emission from soils. The maize yields were 8.2, 17.5, 10.7, and 7.2 Mg ha<SUP>-1</SUP> with clear, permeated, conventional, and non mulching, respectively. We observed that the lowest value of yield scaled N₂O emission was 0.42 kg N₂O Mg<SUP>-1</SUP> with permeated mulching film. For economic viability and environmental conservation, we suggest that permeated plastic mulching film is the most effective to reduce N₂O emission per unit of crop production.

세척수 온도에 따른 신선편이 연근의 품질

장민선 ( Min Sun Chang ),김지강 ( Ji Gang Kim ),김건희 ( Gun Hee Kim ) 한국식품저장유통학회(구 한국농산물저장유통학회) 2011 한국식품저장유통학회지 Vol.18 No.3

This study investigated the changes in the quality of fresh-cut lotus roots that were treated with hot water. Lotus roots were purchased from Daegu, Korea. They were washed, peeled, and cut into 1cm-thick slices with a ceramic knife. The peeled and sliced lotus roots were dipped for 45 sec in water at 30, 55, and 80℃. After they were air-dried at room temperature, the slices were packed in polyethylene films and stored at 4℃ for 12 d. Then the changes in the weight loss, color, total viable cell, and sensory characteristics were measured. Generally, the weight loss of the lotus roots that were treated with hot water slightly increased. The application of the heat treatment delayed the browning of the lotus roots, especially the treatment with 55℃ hot water. The L and a values of the lotus roots that were treated with 80℃ hot water significantly increased during their storage, though. The heat treatment effectively inhibited the growth of microorganisms. The organoleptic quality of the lotus roots that were treated with 55℃ hot water was the best.

포장재질에 따른 열처리한 연근의 저장 중 품질변화

장민선 ( Min Sun Chang ),박미지 ( Mi Ji Park ),김지강 ( Ji Gang Kim ),김건희 ( Gun Hee Kim ) 한국식품저장유통학회(구 한국농산물저장유통학회) 2012 한국식품저장유통학회지 Vol.19 No.6

본 연구는 열처리한 연근의 포장재에 따른 품질 변화를 조사하기 위하여 수행되었다. 산지에서 구입한 연근을 수돗물로 표면과 이물질 등을 제거하고, 박피 및 절단한 후 55℃에서 45초간 열처리한 후 PE, PET 트레이+랩핑 및 진공포장으로 각각 처리하고 4℃에서 저장하였다. 중량감모율, 표면색도, 경도, 일반세균수, 대장균군수, 관능검사 등을 통하여 품질을 분석하였으며 중량감모율은 저장기간이 경과함에 따라 전반적으로 증가하였고, 진공포장 한 경우 증가폭이 가장 낮았다. PE로 포장한 연근의 L값 및 ΔE값 변화가 가장 크게 나타났고, 진공포장 한 연근에서 갈변이 다소 지연되는 경향을 보였다. 저장 중 연근의 경도에 있어서 표면색 변화와 마찬가지로 진공포장 한 경우 저장기간 동안 높은 경도를 유지하였다. 미생물수는 저장기간이 경과함에 따라 전반적으로 증가하였으며 포장재에 따른 유의적인 차이는 없었다. 박피 및 절단 연근에 대하여 중온 열처리 및 진공포장은 초기 살균효과와 함께 저장 중 갈변억제, 균수 제어 등의 품질유지에 효과적이었다. This study was investigated the changes in quality of heat treated fresh-cut lotus roots using various packaging materials. Lotus roots were purchased from Daegu, Korea. Lotus roots were washed, peeled and sliced with a sharp ceramic knife. The prepared peeled and sliced lotus roots were dipped for 45 sec in water at 55℃. After air-dried at room temperature, the slices were packaged with polyethylene films, polyethylene terephthalate tray+wrapping, vacuum packaging and then stored at 4℃. Changes in weight loss, color, firmness, microorganisms and sensory characteristics were measured. In general, the weight loss rate was increased slightly in vacuum packaged lotus roots. Application of heat treatment delayed browning of lotus roots, and especially vacuum packaged lotus roots were the most lowest △E value. However, L and △E value of PE film packaged lotus roots were increased highly during storage. The heat treated and vacuum packaging inhibited the growth of microorganisms effectively. The organoleptic quality of vacuum packaged lotus roots showed the best by sensory evaluation.

Oxidation behavior of YAG-ZrB2 ceramics prepared by spark plasma sintering

Jie-Guang Song,Da-Ming Du,Yin-Yan Ju,Yang-Liang Li,Shi-Bin Li,Gang-Chang Ji 한양대학교 세라믹연구소 2010 Journal of Ceramic Processing Research Vol.11 No.4

ZrB2 and YAG are widely applied because of some excellent properties, but ZrB2 is easily oxidized in high-temperature air. To make ZrB2 ceramics have better oxidation resistance, high-density YAG-ZrB2 ceramics were prepared. The oxidation behavior of YAG-ZrB2 ceramics is investigated at different temperatures. The results indicate that the enhanced weight change differs according to the temperature range, slightly in the temperature 900-1000oC, sharply from 1100-1300 and smoothly above 1300oC. The weight change rate of YAG-ZrB2 ceramics is increased by prolonging the oxidation time, but the weight change rate of YAG-ZrB2 ceramics is gradually reduced. The oxidation layer is porous as compared to the YAG-ZrB2 ceramics layer.

Molecular cloning, chromosomal localization and expression profiling of porcine selenoprotein M gene

Ji-Chang Zhou,Hua Zhao,Jia-Yong Tang,Jun-Gang Li,Xiao-Li Liu,Yu-Mei Zhu 한국유전학회 2011 Genes & Genomics Vol.33 No.5

Selenoprotein M may regulate a myriad of biological processes through its redox function. In pigs, neither the nucleotide sequence nor the amino acid sequence is known. Furthermore,patterns of tissue expression and regulation by dietary selenium (Se) have not been examined. We determined the full coding sequence (CDS) and the chromosomal location of the porcine gene, SELM, and described its expression profile in vivo under different dietary Se concentrations. The cDNA sequence of porcine SELM from the start codon to the poly(A) tail was cloned by reverse transcription PCR. The CDS contained 429bases with a typical mammalian selenocysteine insertion sequence of form 2 (F2) located in the 3′-untranslated region. The gene was mapped to chromosome 14q21, where porcine SELM and its neighboring genes exhibited a similar organization to human homologues on chromosome 22q12.2. The expression pattern of SELM mRNA in muscle, thyroid, cerebral cortex, pituitary, testis, liver, and kidney was analyzed with real-time quantitative PCR in young male pigs fed a Se-deficient corn-soybean meal basal diet supplemented with 0.0, 0.3,or 3.0 mg Se/kg in the form of Se-rich yeast. Though the SELM mRNA abundance in each of the 7 tissues was not affected by the dietary Se concentrations, it was significantly higher in thyroid (P < 0.01) than in cerebral cortex, pituitary,testis, liver, and kidney at all of the 3 dietary Se concentrations.

Environmental Microbiology/Microbial Diversity : Isolation and Characterization of Bacteriophages Against Pseudomonas syringae pv. actinidiae Causing Bacterial Canker Disease in Kiwifruit

( Ji Gang Yu ),( Jeong A Lim ),( Yu Rim Song ),( Sung Gi Heu ),( Gyoung Hee Kim ),( Young Jin Koh ),( Chang Sik Oh ) 한국미생물 · 생명공학회 2016 Journal of microbiology and biotechnology Vol.26 No.2

Pseudomonas syringae pv. actinidiae causes bacterial canker disease in kiwifruit. Owing to the prohibition of agricultural antibiotic use in major kiwifruit-cultivating countries, alternative methods need to be developed to manage this disease. Bacteriophages are viruses that specifically infect target bacteria and have recently been reconsidered as potential biological control agents for bacterial pathogens owing to their specificity in terms of host range. In this study, we isolated bacteriophages against P. syringae pv. actinidiae from soils collected from kiwifruit orchards in Korea and selected seven bacteriophages for further characterization based on restriction enzyme digestion patterns of genomic DNA. Among the studied bacteriophages, two belong to the Myoviridae family and three belong to the Podoviridae family, based on morphology observed by transmission electron microscopy. The host range of the selected bacteriophages was confirmed using 18 strains of P. syringae pv. actinidiae, including the Psa2 and Psa3 groups, and some were also effective against other P. syringae pathovars. Lytic activity of the selected bacteriophages was sustained in vitro until 80 h, and their activity remained stable up to 50oC, at pH 11, and under UV-B light. These results indicate that the isolated bacteriophages are specific to P. syringae species and are resistant to various environmental factors, implying their potential use in control of bacterial canker disease in kiwifruits.

A 10-Year Single-Center Experience of Catheter-Related Thrombosis in Neonates

( Ji Hye Shin ),( Mi Hyeon Gang ),( Yong Wook Lee ),( Hong-ryang Kil ),( Mea-young Chang ) 대한주산의학회 2021 Perinatology Vol.32 No.3

Objective: Central catheterization is one of the major iatrogenic risk factors of neonatal thrombosis. We conducted this study to investigate the clinical features of neonatal catheter-related thrombosis. Methods: This is a single-center retrospective study which reviewed medical records of neonates who were admitted to our neonatal intensive care unit (NICU) from May 2010 to April 2020. Results: Among the 4,978 neonates hospitalized in our NICU, 2,773 neonates were inserted central catheter. Thirteen neonates (0.47%) were diagnosed with catheter-related thrombosis. Median gestational age was 29 weeks 5 days and median birth weight was 1,080 g. The incidence of thrombosis with each catheter was 0.64% for infants with umbilical artery catheter, 1.35% with umbilical venous catheter, 0.28% with peripherally inserted central catheter and 0.38% with subclavian venous catheter. The type of thrombus was 69.2% as venous and 15.4% as intracardiac and arterial, respectively. The symptoms that led to the diagnosis of thrombosis were color changes, swelling in the insertion site and cardiac murmur. Doppler ultrasound and echocardiography were performed for diagnosis. Their postnatal age at diagnosis was 22±12 days and the mean duration of catheterization was 10±4 days. Seven neonates (53.8%) were treated with low molecular weight heparin. Eight neonates (61.5%) demonstrated resolution of thrombosis. Mean time for resolution was 198±212 days. There was one mortality (7.7%) from pulmonary thromboembolism related to the superior vena cava thrombosis. Conclusion: In newborns, the risk of thrombosis is high and careful monitoring is required. Antithrombotic treatment should be considered in newborn with clinically significant thrombosis and follow- up observation is also required.