• 한국연초학회지
• /
• 제21권1호
• /
• pp.10-16
• /
• 1999

Leaves harvested were separated with visual characters into 2 classes such as immature and mature leaves. In the curing process, the prolonged yellowing treatment during yellowing stage was automatically controlled at the different stalk position, and condition of curing process after this period was all the same with conventional ones. In case of prolonged yellowing in immature leaves, increase of price per kg reached to 8 % compared with those of conventional ones. In physical properties, filling capacity and shatter index was decreased with the degree of maturity, and it was equal level in filling capacity of immature leaves between curing method, while shatter index was decreased in prolonged yellowing treatment than that of conventional ones. There was no difference in chemical components between immature leaves of prolonged yellowing and conventional ones. As to the prolonged yellowing of immature leaves, there was decreased in citric and malic acid contents of the nonvolatile organic acids, and it was equal level in all higher fatty acids content of leaves cured by prolonged yellowing treatment compared with in that of conventional curing method. The contents of key compounds such as solanone, damascenone, damascone in the essential oil were lower in prolonged yellowing of immature leaves than those of mature leaves cured by conventional ones.

• 한국화재소방학회논문지
• /
• 제23권1호
• /
• pp.21-32
• /
• 2009

본 연구에서는 임내 연료의 산불 위험성을 판단하기 위하여 영동지역에 자생하는 주요 7가지 수종의 낙엽과 생엽을 대상으로 TG/DTA와 발화점 시험기를 이용하여 열적특성과 발화특성을 고찰하였다. 가열속도 변화에 따른 열 중량변화를 분석한 결과, 가열속도가 증가할수록 열적 지연현상이 나타났지만 중량감소율에 따른 잔류량은 차이가 없는 것으로 나타났다. 수종별 온도변화에 따른 열 중량분석 결과, 낙엽과 생엽 모두 침엽수가 활엽수보다 총중량감소율이 큰 것으로 나타났다. 발화특성에 대한 분석결과로는 낙엽과 침엽수의 자연발화온도가 낮고 열에 대한 저항성이 낮기 때문에 생엽과 활엽수보다 발화 위험성이 높은 것으로 나타났다.

• 한국약용작물학회지
• /
• 제20권6호
• /
• pp.472-478
• /
• 2012

This study was carried out to investigate solid-state fermentation method using cellulolytic lactic acid bacteria Lactobacillus plantarum TO-2100 in order to increase piperidine alkaloid contents in mulberry leaves. Piperidine alkaloid, one type of which include 1-deoxynojirimycin (1-DNJ), is known to inhibit ${\alpha}$-glycosidase activities. Using this strain, the optimal solid-state fermentation conditions on mulberry leaves powder were found as the following: initial moisture content, temperature and relative humidity were 20%, $30{\sim}35^{\circ}C$ and 60 ~ 70%, respectively, and the fermentation time was 72 hrs. The piperidine alkaloid contents in the fermented mulberry leaves were 2.86% on dry powder, which is 7-fold increase from that of non-fermented mulberry leaves. The 1-deoxynojirimycin contents after applying preparative thin layer chromatography were 2.02% on dry powder, which is 8 times higher than that of non-fermented mulberry leaves. ${\alpha}$-Glycosidase activities was inhibited by 65.7 ~ 84.7% with 3 ~ 5% treatments of hot-water extracts of the fermented mulberry leaves, compared to 16.2 ~ 40.2% with 3 ~ 5% treatments of hot-water extracts of non-fermented mulberry leaves. Therefore, the results suggest that solid-state fermentation method does indeed increase of piperidine alkaloid contents on mulberry leaves.

• 한국잠사곤충학회지
• /
• 제22권1호
• /
• pp.46-51
• /
• 1980

CCC의 엽면살포가 상수의 생장 및 생체내 대사에 미치는 영향을 분석 검토하여 얻어진 결과를 요약하면 다음과 같다. 1. 상엽의 생건중, 엽면적, 지조장, 지조중은 감소되었으나 지조경장은 약간 증대되었다. 2. 상엽의 엽록소 함량 증대에 효과가 있었다. 3. 상엽의 GOT, GDP 활성에 영향을 주지 않았다. 4. 상엽내 분해능의 활성은 낮았으나 합성능의 활성은 높았다.

• 한국식품영양학회지
• /
• 제13권1호
• /
• pp.53-58
• /
• 2000

The production of malondiadehyde(MDA) was significantly decreased when the methoanol extract of persimmon leaves was added to the system. The methanol extract of persimmon leaves was fractionated by using various solvents such as hexane, chloroform, ethylacetate and butanol. Among the above fractions especially the chloroform fraction, ethylacetate fraction revealed the strong antioxidative activities. The hot water extract of the persimmon leaves was less effective than tannin which was extracted from persimmon leaves in antioxidative activity.

• 동아시아식생활학회지
• /
• 제20권2호
• /
• pp.193-200
• /
• 2010

The study examined the preference and style of consumption of perilla leaves(Perilla frutescens var. japonica Hara), a popular food item in Korea, by consumers in the Daejeon area. Of the respondents 35.2% purchased perilla leaves in a large super-market limited to two to three bundles. Comsumer preferences were to consume the leaves raw or pickled with salt or soy sauce, or use as a fish soup ingredient. The majority of consumers aged 20~29-years-of age preferred to wrap sashimi with perilla leaves. As a side dish, regardless of age, consumers preferred to pan-fried perilla leaves with mincedmeat and perilla leaves.

• 한국잠사곤충학회지
• /
• 제20권1호
• /
• pp.5-10
• /
• 1978

Kinetin의 엽면살포가 상수의 생장및 생체내 대사에 미치는 영향을 분석 검토하여 얻어진 결과를 요약하면 다음과 같다. 1. 상엽의 생건중, 엽면적. 지조장, 지조경의 증대에 효과가 있었다. 2. 상엽의 엽록소의 함량증대에 효과가 있었다. 3. 상엽의 GOT활성은 촉진시켜 주었으나 GPT활성에는 영향을 주지 않았다. 4. 상엽내 당대사를 촉진시켜 주었다.

• 한국자원식물학회지
• /
• 제27권4호
• /
• pp.371-379
• /
• 2014

14종의 잿빛곰팡이병 균주를 순무의 잎에 접종시켜 병반의 확대 정도를 조사한 결과 순무잎은 '사과-01' 등 4종의 균주에 대해서는 감수성을, '아카시아' 등 7종에 대해서는 보통, '오렌지' 등 3종에 대해서는 저항성을 보였다. 순무잎에 함유된 glucosinolate (GLS)를 분석한 결과 butenyl-GLS, indol-3-ylmethyl GLS (I3M), 4-methoxy-indol-3-ylmethyl GLS (4MOI3M) 및 normal methoxy-indol-3-ylmethyl GLS (NMOI3M) 등 4 종류가 동정되었다. 순무잎의 GLS 함량은 감수성을 보이는 균주에 감염되었을 때보다 저항성을 보이는 균주에 감염되었을 때 높게 유지되거나 분해가 지연되는 것으로 나타났다. 특히 I3M의 함량은 저항성인 균주에 감염되었을 때는 무처리보다 보다 2.5배 이상 함량이 증가하였으나 감수성 균주에 감염되었을때는 무처리 보다 함량이 낮았다. 4MOI3M 및 NMOI3M의 함량도 저항성을 보인 균주에서 무처리에 비해서 각각 2.3 및 2.7배 이상의 증가를 보였다. 잿빛곰팡이병이 순무잎에 감염되면 병반의 중심으로 부터 5~10 mm 부근에 GLS 함량이 현저하게 증가하였다. 그러나 저항성 균주를 처리한 곳에서는 GLS 함량이 계속 유지되면서 병반의 확대가 더 이상 진전되지 않으나, 감수성 균주를 처리한 잎에서는 기존에 합성되었던 GLS의 함량이 감소되면서 병반이 계속적으로 확대되어 갔다. 이는 GLS가 순무잎의 잿빛 곰팡이병에 대한 저항성을 나타내는 중요한 물질임을 시사한다.

• Toxicological Research
• /
• 제35권3호
• /
• pp.279-285
• /
• 2019

In this study, we investigated the therapeutic potential of Cinnamomum camphora leaves on allergic skin inflammation such as atopic dermatitis. We evaluated the effects of C. camphora leaves on human adult low-calcium high-temperature keratinocytes and atopic dermatitis mice. C. camphora leaves inhibited Macrophage-derived chemokine (an inflammatory chemokine) production in $interferon-{\gamma}$ (10 ng/mL) stimulated Human adult low-calcium high-temperature keratinocytes in a dose dependent manner. C. camphora leaves suppressed the phosphorylation of janus kinase signal transducer and activator of transcription 1. C. camphora leaves also suppressed the phosphorylation of extracellular signal-regulated kinase 1/2, a central signaling molecule in the inflammation process. These results suggest that C. camphora leaves exhibits anti-inflammatory effect via the phosphorylation of signal transducer and activator of transcription 1 and extracellular signal-regulated kinase 1/2. To study the advanced effects of C. camphora leaves on atopic dermatitis, we induced experimental atopic dermatitis in mice by applying 2,4-dinitrochlorobenzene. The group treated with C. camphora leaves (100 mg/kg) showed remarkable improvement of atopic dermatitis symptoms: reduced serum immunoglobulin E levels, smaller lymph nodes with reduced thickness and length, decreased ear edema, and reduced levels of inflammatory cell infiltration in the ears. Interestingly, the effects of C. camphora leaves on atopic dermatitis symptoms were stronger than those of hydrocort cream, a positive control. Taken together, C. camphora leaves showed alleviating effects on the inflammatory chemokine production in vitro and atopic dermatitis symptoms in vivo. These results suggest that C. camphora leaves help in the treatment of allergic inflammation such as atopic dermatitis.

• Journal of Photoscience
• /
• 제3권1호
• /
• pp.15-21
• /
• 1996

To investigate the chilling sensitivity related injuries in the photosynthetic apparatus of cucumber leaves, the light-chilling induced alterations of chlorophyll fluorescence transients in cucumber leaves were compared with those in pea leaves. As an early effect of light-chilling, an increase in Fp/Fm$^*$ was observed in both pea and cucumber leaves, which was saturated by about 6 h chilling. However, the saturated value of Fp/Fm was almost 1.0 in cucumber, in contrast to about 0.8 in pea. During the recovery period after 24 h chilling, the light-chilling induced changes in pea seemed to be reversed, but those in cucumber leaves were thought to be irreversible, because Fo was increased significantly. Light-chilling caused significant decreases in qQ and qE in cucumber leaves, but qR was increased until 6 h, and decreased thereafter. In both pea and cucumber leaves, Fm was increased by 2 h dark treatment. The Fm from the predarkened pea leaf discs was higher than the value from the preilluminated ones during the whole period of light-chilling (500 $\mu$mol m$^{-2}$s$^{-1}$ PAR). However, the predarkened cucumber leaf discs showed a reduction in Fm and an increase in Fo during the 2 h chilling in the light. These results indicate that the causes of chilling sensitivities in photosynthetic apparatus of cucumber leaves are possibly related with the damage in PSI reaction center and the ability of acidification of lumen by PSII.