• 한국유기농업학회지
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• 제5권1호
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• pp.101-110
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• 1996

Inorder to minimize the daily intake amount of nitrate by chinese cabbage, the favorate vegetable for Korean, the influences of storage conditions at different temperature and light or dark treatments after post-harvest and effects of cooking temperature and infrared rays on changes of nitrate contents in edible parts of chinese cabbage were determined. The nitrate contents on midrib and leaf blade in chinese cabbage during post-harvest were decreased steeply in 2 days and decreased slowly again in 5 days. The temperature treatment to decrease the nitrate contents in midrib and leaf blade of chinese cabbage were effective as the following of $25^{\circ}C$> $15^{\circ}C$ > $-4^{\circ}C$ > $-10^{\circ}C$. The nitrate contents of midrib and leaf blade were decreased in the timecourse of post-harvest. It is more effective to store in $4^{\circ}C$ than in $15^{\circ}C$, and is more effective in transparent vinyl package than in black vinyl package, but the treatment of light is more effective than the treatment of temperature. The nitrate contents of midrib decreased rapidly by 17.9% in the treatment of 5 days at$ 15^{\circ}C$. By treatment of $80^{\circ}C$, $90^{\circ}C$, $100^{\circ}C$ water, the nitrate contents of midrib were increased slightly, but decreased in leaf blade. It reached 68.5%, 50.6%, 45.9% in the leaf blade respectively by treatment of 80%, 90%, 100% water at 1 min. By infrared rays treatment, the nitrate contents of midrib did not change in 3 min but increased rapidly after 6 min, and in the leaf blade it increased continually after 1 min.

• 한국유기농업학회지
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• 제10권1호
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• pp.65-74
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• 2002

電氣刺戟의 處理時間이 赤丸20일 무의 收量形質과 可食部 內 窒酸含量에 미치는 영향을 조사하기 위하며 실험한 결과는 다음과 같다. 1. 電氣刺戟 2시간처리가 葉長生長과 根徑肥大를 촉진시키는데 효과적이었으며, 'Comet'와 'Sakuranbo'의 根徑은 무처리구에서 보다 각각 14.7%와 12.8% 증가하였다. 2. 根生體重에서 'Comet'는 2시간구가, 'Sakuran'는 8시간구가 가장 높았고, 이것은 무처리구 보다 각각 39%이상 높은 것이었다. 3. 모든 電氣처리구의 뿌리 내 질酸含量은 무처리구 보다 높았다. 그리고 뿌리의 窒酸含量은 根徑, 機重, 그리고 總重量과도 높은 正의 相關關係를 가고 있는 것으로 나타났다.

• 한국약용작물학회지
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• 제26권3호
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• pp.205-213
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• 2018

Background: Since the revised Ginseng Industrial Act was passed, ginseng sprouts have become a new medicinal vegetable for which there is high consumer demand. However, the existing amount of research and data on ginseng production has not kept pace with this changed reality. Methods and Results: In this study we analyzed the changes in the amounts of ginsenosides in different parts of growing ginseng sprouts during the period from when organic seedlings were planted in nursery soil until 8 weeks of cultivation had elapsed, which was when the leaves hardened. In the leaves, ginsenoside content increased 1.62 times with the panaxadiol (PD) system and 1.31 - 1.56 times with the panaxatriol (PT) system from 7 to 56 days after transplantation. During the same period, the total ginsenoside content of the stems decreased by 0.66 - 0.91 times, and those of the roots increased until the $21^{st}$ day, and then underwent steep declines. The effect of fermented press cake extract (FPCE) and tap water (TP) on the total amount of ginsenoside per plant were similar, and could be represented with the equations $y=1.4330+0.2262x-0.0008x^2$ and $y=0.9555+0.2997x-0.0031x^2$ in which y = ginsenoside content x = amount of and on the total amounts of FPCE or TP, respectively after 26.4 days, however, the difference between ginsenoside content with FPCE and TP widened. Conclusions: These results suggested that the amounts of ginsenosides in different parts of ginseng varied with the cultivation period and nutrient supply. These findings also provide fundamental data on the distribution of ginsenosides among plant parts for 2-year-old ginseng plants in the early-growth stage.

• 펄프종이기술
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• 제46권5호
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• pp.79-87
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• 2014

The enrichment with nutrients in rivers and lakes becomes serious problems in Korea. As the environmental friendly solution, the phytoremediation are getting more attention and the water hyacinth could be a strong candidate plant for this. Water hyacinth is a free floating freshwater plant proven to be a effective plant used for a purification of a polluted lakes, sewage wastewater, and livestock wastewater. The biggest obstacles for application of water hyacinth in Korea could be the disposal of the water hyacinth before winter, because there is no feasible use for the water hyacinth until now. In this study, the characteristics of water hyacinth were deeply investigated for providing background data to develop appropriate application of the water hyacinth. The water hyacinth was fractioned three parts, leaf, air blader, root of which morphological properties were evaluated with microscope and field emission scanning electron microscope (FE-SEM). The water contents of each parts of the water hyacinth were 87% for leaf, 96.5% for air bladder, 94.6% for root. The chemical compositions of each parts were also measured and showed around 29% of hot water extract in leaf and air bladder, 42% holocellulose for leaf, 47% holocellulose for air bladder. The application of water hyacinth biomass without root parts to papermaking provided bulkier structure, but the tensile strength was decreased.

• Corrosion Science and Technology
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• 제22권6호
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• pp.447-456
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• 2023

In this work, we performed a comparative study examining two coatings on Ti Gr.1 for use in fuel cell bipolar plates. The coatings consisted of carbon black as the conductor along with acrylic polymer and Ti Sol-Gel binder as the binder. Ti Sol-Gel that had precipitated as TiO₂ in areas impregnated between carbon black gaps, thereby acting as a binder for carbon black and serving as a polymer coating. Neither of the coatings peeled off during the 90° bend test to check formability. The contact resistance of the TiO₂ coating was found to be lower than that of the polymer binder coating. Moreover, due to coating shrinkage (denser) that occurred during the heat treatment process, the TiO₂ binder coating showed almost the same level of corrosion resistance, as measured by potentiostatic and EIS tests, despite being thinner than the polymer coating. However, both the polymer binder coating and the TiO₂ binder coating had many pores and irregularities internally (around 10 ~ 100 nm) and on the surface (0.1 ~ 2 ㎛). We considered that these pores and irregularities contributed to the lower corrosion resistance.

• 유기물자원화
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• 제25권1호
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• pp.47-55
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• 2017

유기성폐기물의 수열처리 기술은 고온에서 운전하여 에너지 소비가 큰 열분해 탄화기술의 단점을 보완하기 위한 방법으로, 세포벽을 파괴하여 탈수성을 향상시켜 탈수공정에서 함수율을 약 40% 수준까지 낮출 수 있는 장점을 가지고 있어 유기성폐기물의 고형연료화 분야에서 전 세계적으로 많은 연구가 진행되고 있다. 이에 본 연구에서는 수열처리가 유기성폐기물의 건조효율에 미치는 영향에 대하여 평가하였다. 대상물질로는 대표적인 유기성폐기물인 하수슬러지와 음식물류폐기물을 이용하여 $200^{\circ}C$에서 1시간동안 수열처리한 후 건조효율 변화를 관찰하였다. 유기성폐기물은 수열처리 후에 건조시간이 단축되어 $100^{\circ}C$에서 건조한 음식물류폐기물의 경우 원시료보다 건조시간이 52.9% 감소하였다. 따라서 수열탄화 반응이 하수슬러지와 음식물류폐기물의 건조효율을 상승시킬 수 있음을 확인하였다. 또한, 건조특성곡선의 예열기간에서 건조속도가 원시료 대비하여 각각 148%($80^{\circ}C$ 하수슬러지), 151%($100^{\circ}C$ 하수슬러지), 209%($80^{\circ}C$ 음식물류폐기물), 366%($100^{\circ}C$ 음식물류폐기물)로 모든조건에서 증가되는 것으로 보아 수열반응에서 세포벽이 파괴되면서 표면적이 늘어났음을 간접적으로 파악할 수 있었다. 건조시간이 단축됨에 따라 한계함수율이 높아져 감율건조기간이 증가하였으므로 이에 주의하여야 하며, 탄화정도에 따라 건조효율이 더 개선될 수 있을 것으로 기대된다.

• 한국작물학회지
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• 제41권4호
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• pp.496-504
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• 1996

본 연구는 자생지 야생더덕이 가지는 고방향성의 특성을 노지재배시 재배더덕에서도 고방향성을 갖는 재배기술을 확립하기 위하여 차광과 유기물 시용량을 달리하여 시험하였는 바 얻어진 결과를 요약하면 다음과 같다. 1. 차광조건에 따른 기상차이는 무차광구에 비해 차광(55%)에서 최고기온 6.1$^{\circ}C$, 최저기온 0.6$^{\circ}C$, 평균기온 3.4$^{\circ}C$ 낮았고 지온도 3.4$^{\circ}C$ 낮았으며 조도량도 무차광에 비해 44% 정도 적었다. 2. 더덕의 지상부 및 지하부 생육은 유기물 시용양이 많을수록 양호하였으나 그 효과는 차광(55%)에 비하여 무차광에서 현저하였다. 3. 더덕뿌리의 일반성분 조성에서 조단백질은 차광구에서 높았고 유기물 시용량이 많을수록 현저하게 높았으나 무차광구에서는 이와 반대로 유기물 시용량이 많을수록 현저하게 감소하였으며 조지방은 무차광 구에서 높았고 유기물 시용량이 많을수록 조성분은 상반되는 경향을 보였다 4. 무기성분중에서 다량원소인 K, Ca, Mg등은 차광구에 비해 무차광구에서 높았고, 유기물 시용량이 많을수록 현저하게 높았으나 미량원소는 차광조건과 유기물 시용량에 따른 조성의 차이를 보이지 않았으며 조사포닌 함량은 차광구에 비해 무차광구에서 높았으나 유기물 시용량간에는 일정한 경향이 없었다. 5. 유리 아미노산의 함량은 차광구에 비해 무차광구에서 높았으며 유기물 시용량이 많을수록 높은 경향을 보였고 arginine이 가장 많은 함량을 보였다. 6. 식물정유 성분의 수율변화는 차광 55%에 비하여 무차광이 높은 경향을 나타내었으며 유기물 시용량이 많을수록 증가하는 것으로 나타났다. 7. 향기성분은 총 44종이 동정되었는데 1-hexanol, cis-3-hexenol, trans-2-hexanal 등이 높은 조성을 보였고 무차광구에 비하여 차광구(55%)에서 높았으며 유기물 시용량이 많을수록 현저히 증가하는 경향이었다. 8. 종합적으로 볼 때 지상부 및 지하부 생육은 차광에 비해 무차광에서 양호하였으나 향기성분은 무차광에 비하여 차광에서 높았고 유기물 시용량간에도 시용량이 증가할수록 방향성이 높아 고품질의 더덕을 생산하기 위해서는 차광과 유기물 다량시용을 병행해야 할 것으로 판단되었다.

• 농약과학회지
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• 제18권4호
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• pp.376-382
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• 2014

황토유황합제 제조 5주 후 녹지 않은 잔재물을 제외하고 수용성 황토유황합제만 준비하였다. 황토유황합제 제조시 가성소당를 원래 양보다 25% 감량하여 황토유황합제의 pH를 pH 1 낮추었다. 현미식초(pH 2.8)을 이용하여 황토유황합제의 pH 수준을 pH 5.0에서11.0까지 현미식초(pH 2.8)를 이용하여 pH를 1씩 조절하였다. 황토유황합제 원액의 pH는 13으로 토마토에 살포하였을 때 신초와 꽃눈에 약해를 주었다. pH가 조정된 0.05% 황토유황합제를 E. cichoracearum에 의해 흰가루병이 발생한 토마토에 7일간격으로 2회 살포하였다. pH가 조정된 황토유황합제를 1회 살포하고 7일 후 토마토의 흰가루병이 70~95% 방제되었다. 두 번째 살포 후 토마토 흰가루병이 확연하게 방제되었다. 결론적으로 pH를 조정한 황토유황합제는 토마토에 약해를 보이지 않으며, 유기농업에서 토마토 흰가루병 방제용 자재로 사용할 수 있을 것으로 생각한다.

• 한국식품조리과학회지
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• 제17권1호
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• pp.80-90
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• 2001

This study was carried out to investigate to proximate compositions, free sugars, organic acids, amino acids, and volatiles from the fresh leaf, root and seed of coriander. The research results are as follows: Moisture was 79.93% in the leaf, 81.89% in the root. Crude protein, crude lipid and crude ash were the highest in the seed. Ascorbic acid was 65.4mg% in the leaf and 37.83mg% in the root. Glucose, fructose and sucrose were the major free sugars. Glucose was 7.92mg% and fructose 7.51mg% in the leaf. Sucrose was 17.34mg% in the root, highest level. Among organic acids, malic acid was 354.55mg% in the leaf, the highest level. The content rate of organic acids was high in the order of leaf, seed and root. The content rate of total amino acid was high in the order of seed, root and leaf. Glutamic acid and aspartic acid were high in the leaf and root. Glutamic acid and proline were high in the seed. The content rate of free amino acid is the same as that of total amino acid. Glutamic acid and serine were high in the leaf and seed. Glutamic acid and treonine were high in the root. The contents of total amino acid in each parts of the coriander was higher than that of free amino acid, The composition of amino acid in the total amino acid and free amino acid was different. The volatile constituents were extracted by steam distillation method and analyzed by GC-Mass. The content of the volatile constituents was 45.31mg% in the leaf, (E)-2-decenal was the highest, followed by decanal, 2-dodecenal, (E)-2-decen-1-ol in order, aldehyde and alcohol was major constituents. The content of the volatile constituents was 36.01mg% in the root and 54.37mg% in the seed. linalool was the highest in the root and seed. it was 22.27 %, 53.67% in root and seed.

• 한국환경과학회지
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• 제8권5호
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• pp.617-623
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• 1999

This study was carried out to obtain the optimal operating parameter on organic matters and nutrient removal of mixed wastewater which was composed of sewage and stable wastewater using SBR. A laboratory scale SBR was operated with An/Ae(Anaerobic/Aerobic) ratio of 3/3, 2/4 and 4/2(3.5/2.5) at organic loading rate of 0.14 to 0.27 kgBOD/$m^3$/d. TCOD/SCOD ratio of mixed wastewater was 3, so the important operating factor depended upon the resolving the particulate parts of wastewater. Conclusions of this study were as follows: 1) For mixed wastewater, BOD and COD removal efficiencies were 93-96% and 85-89%, respectively. It was not related to each organic loading rate, whereas depended on An/Ae ratio. During Anarobic period, the amount of SCOD consumption was very little, because ICOD in influent was converted to SCOD by hydrolysis of insoluble matter. 2) T-N removal efficiencies of mixed wastewater were 55-62% for Exp. 1, 66-76% for Exp. 2, and 67-81% for Exp. 3, respectively. It was found that nitrification rate was increased according to organic concentration in influent increased. Therefore, the nitrification rate seemed to be achieved by heterotrophs. During anoxic period, denitrification rate depended on SCOD concentration in aerobic period and thus, was not resulted by endogenous denitrification. However, the amount of denitrification during anaerobic period were 3.5-14.1 mg/cycle, and that of BOD consumed were 10-40 mg/cycle. 3) For P removal of mixed wastewater, EBPR appeared only Mode 3($3^＊$). It was found that the time in which ICOD was converted to VFA should be sufficient. For mode 3 in each Exp., P removal efficiencies were 74, 87, and 81%, respectively. But for 45-48 of COD/TP ratio in influent, P concentration in effluent was over 1 mg/L. It was caused to a large amount of ICOD in influent. However, as P concnetration in influent was increased, the amounts of P release and uptake were increased linearly.