• Journal of Applied Biological Chemistry
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• 제63권3호
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• pp.259-265
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• 2020

두충나무(Du-zhong, Eucommia ulmoides Oliver)의 잎과 껍질로 부터 얻어진 50% 에탄올 추출물의 항산화 활성을 확인하였다. 두충나무 잎과 껍질 추출물의 수율은 각각 8.1±0.31과 17.4±0.89%, 총 폴리페놀 함량은 각각 64.1±3.35와 42.4±2.38 ㎍ GAE/mg, 총 플라보노이드 함량은 각각 24.0±3.15와 36.7±3.18 ㎍ QE/mg으로 나타났다. 두충나무 잎과 껍질 추출물은 농도에 비례하여 양이온라디칼, 유리라디칼과 아질산염을 소거하였고, 환원력을 증가시켰으며 지질과산화를 억제하였다. 두충나무 잎과 껍질 추출물의 ABTS 양이온라디칼 소거에 대한 EC₅₀값은 각각 560.6±17.65와 1,357.4±8.45 ㎍/mL이었고, DPPH 유리라디칼 소거에 대한 EC₅₀값은 각각 574.2±14.70과 2,103.1±108.59 ㎍/mL로 나타났다. 또한 두충나무 잎과 껍질 추출물의 환원력에 대한 EC₅₀값은 각각 319.9±13.42와 705.9±26.08 ㎍/mL였고, 아질산염 소거에 대한 EC₅₀값은 각각 2,329.2±35.11과 5,467.6±243.92㎍/mL로 나타났다. 두충나무 잎 추출물은 74.8 ㎍/mL의 농도에서, 껍질 추출물은 177.2 ㎍/mL의 농도에서 linoleic acid의 과산화를 각각 70.0 및 79.1% 억제하였다. 두충나무 잎 추출물은 껍질 추출물에 비해 높은 항산화 활성을 보유하고 있었다.

• Journal of the Korean Wood Science and Technology
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• 제44권6호
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• pp.890-896
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• 2016

Paulownia tomentosa is one of fast-growing wood species in Korea. In order to evaluate the solid bioenergy properties of Paulownia tree, this study examined the heating value, moisture content (MC), pH and proximate analysis of stem, branch, root, bark and leaf. The heating values of wood parts were slightly higher than those of bark and leaf, and that of branch was the highest among all the samples. The higher moisture content of bark and leaf referred to their lower heating value. Also, the pH of stem, branch and root was similar and lower than those of bark and leaf. The ash content of bark and leaf was much higher than that of wood parts, which is the one of the reasons for effect on the lower heating value and higher pH. While, the volatile matter content (VMC) of bark and leaf was lower than those of wood parts. The bark showed the highest fixed carbon content (FCC), while the FCC of stem was the lowest among all the samples. The obtained results are encouraging that the Paulownia tree could be totally utilized as alternative fuels for bioenergy production.

• Advances in Traditional Medicine
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• 제8권4호
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• pp.408-415
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• 2008

In the present study, the ethanolic leaf and bark extract of Wrightia tomentosa were tested for comparative in vivo antitumour properties against Ehrlich ascites carcinoma (EAC) tumour bearing mice at 100 and 200 mg/kg body weight doses given orally once daily for 16 days. The EAC mice receiving 100 and 200 mg/kg ethanolic leaf and bark extract showed a dose dependent elevation in tumour, free survival and a highest number of survivors were observed at 200 mg/ kg for leaf extract of ethanol, which was considered as an optimum dose for its anti neoplastic action. The Median survival time for this dose was approximately 44 days when compared with 23 days of non-drug treated controls. The results indicate that the administration of leaf extract not only increased the survival of animals with ascites tumour and reduced packed cell volume and viable tissue cell count, but also altered many hematological parameters changed during tumour progression, indicating the potent antitumour nature of leaf extract than the bark extract. Statistical analysis also reveals that the leaf extract showed highly significant anti tumour potency (p < 0.001) when compared with control.

• The Korean Journal of Ecology
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• 제19권3호
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• pp.241-249
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• 1996

To determine the accumulation and distribution of heavy metals in plants and soils of roadsides, the leaf and bark of Ginkgo biloba and Platanus occidentalis, and the soil were sample from Masan-city roadside and Chinhae forest land in July and November, 1994. The content of heavy metals from all the samples in Masan-city area was much higher than that in Chinhae forest land. The amount of heavy metals in soil was higher than those in plant parts of boty trees. The total amount of heavy metals of the bark was higher than the leaf of G. biloba plants. But that of the bark was less than the leaf of P. occidentalis. Heavy metal content in plants (leaf, bark) varied among elements and collections. The concentrations of heavey metals in both trees were in the order of Zn > Cu > Pb > Cd. The concentrations of the four heavy metals in leaf and Zn in soil in G. Biloba were seasonally changed. Whereas those in P. occidentalis were not significantly changed. And there was a high correlation between the concentrations of Pb and Cu in both trees.

• The Korean Journal of Ecology
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• 제21권2호
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• pp.133-137
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• 1998

Well grown trees of ficus bengalensis produce one or more potential inhibitors of seed germination and seedling growth. The aqueous extract of ficus leaf and bark enhanced the shoot length aqueous leaf extract of F. bengalensis. Bark extract of F. bengalensis inhibited the shoot length and root length of the plant at high concentration. Both the bark and leaf extract inhibited the seed germination. The postemergence and preemergence treatment of bark and leaf extract of F. bengalensis reduced the shoot biomass. The result suggest that F. bengalensis may have potential allelochemicals which may be developed as natural herbicides.

• 한국산학기술학회논문지
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• 제20권2호
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• pp.527-534
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• 2019

야산에 자생하는 붉나무(Japanese sumac)의 천연자원으로서의 유용성을 확인하기 위하여 잎, 열매 및 수피 등 세부위를 열수로 추출하고, 이들 추출물의 몇 가지 추출특성과 아질산염 소거능 등 생리활성을 측정하였다. 추출물의 수율은 부위에 따라 6.62~13.84%의 범위였고, 유리 아미노산은 잎, 열매, 수피에서 각각 24종 37.9 mg/100g, 23종 27.0 mg/100g 및 27종 39.0 mg/100g의 함량이었으며, 7종의 필수 아미노산이 잎>수피>열매의 순으로 측정되었다. Naringin 상당량으로 구한 총플라보노이드 함량은 수피>열매>잎의 순으로 379.9~587.2 mg/100g이었으며, gallic acid 상당량으로 구한 총페놀성 화합물 함량은 잎>열매>수피의 순으로 80.4~111.2 mg/100g이었다. 붉나무 추출물의 아질산염 소거능은 pH 1.2에서 수피 61.93%>열매 57.38%>잎 55.49%의 순으로 측정되었으며, BHT (butylated hydroxytoluene) 소거능의 78.1~100%에 대응되었다. 추출물의 전자공여능은 열매 47.38%>잎 43.06%>수피 38.55%로서 각각 BHT의 65.6%, 58.8% 및 53.6%의 활성으로 비교되었다. 붉나무의 잎, 열매 및 수피 추출물의 환원력은 대조구로 사용한 BHT의 환원력에 비하여 각각 37%, 43% 및 46% 더 높게 평가되었으며, 금속이온 봉쇄능은 수피 27.3%>잎 20.6%>열매 11.2%의 순으로 상당히 낮게 측정되었다.

• 한국농림기상학회지
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• 제6권3호
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• pp.190-195
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• 2004

본 연구는 환경이 다른 두 지역의 잣나무 잎과 수피를 채취하여 비교 분석, 자동차 배기가스와 수목의 관계연구를 위한 기초 자료를 제공하는데 그 목적이 있다. 매월 경춘가도변의 청평과 강원대학교 학술림에서 잣나무 잎과 수피를 채취. 잣나무의 엽중수분함량, 엽중산도, 수피산도, 엽중수용성황함량을 측정하여 다음과 같은 결과를 얻었다. 1. 두 지역의 엽중수분함량을 비교해 보았을 때 학술림 잣나무 잎의 수분 함량이 다소 높게 나타났으나, 그 차이는 현저하지 않았다. 2. 엽중산도와 수피산도에 있어서는 경춘가도 잣나무림의 잎과 수피에서 산도가 다소 높은 것을 알 수 있었는데, 엽중산도는 pH 4.8과 pH 4.9, 수피산도는 pH 5.3과 pH 5.4로 현저한 차이는 보이지 않았다. 3. 엽중수용성황함량은 가장 뚜렷한 지역간 차이를 보였으며, 평균적으로 청평(경춘가도변)지역은 0.133%를 학술림은 0.053%의 수용성황함량을 나타냈다.

• International Journal of Industrial Entomology and Biomaterials
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• 제4권1호
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• pp.5-11
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• 2002

Seven fungicides viz., salcylic acid, bacistin (Carbandazim 50% WP), bayleton (Triadimefon 25% WP), Dithane M-45 (Mancozeb 75% WP), captan (Captaf 50% WP) formaldehyde and benzoic acid at three concentrations (0.50,0.75 and 1.0%) and ten plant products viz., Hena leaf, garlic bulb, tomato leaf, mango bark, cotton leaf, turmeric powder, onion, tulsi leaf, neem leaf and ginger at 1.0,2.0 and 3.0% concentrations were screened against Aspergillus flavus and A. tamarii in vitro. Among fungicides, salcylic acid and bavistin and among plants Hena and Mango bark powder were found to be very effective at all concentrations tested. Based on in vitro screening, only selected six fungicides at 1.0, 1.5 and 2.(0% and six plants at 2.0,4.0 and 6.0% concentrations were tested in vivo for controlling Aspergillosis in silkworm. Salcylic acid and bavistin fungicides and Hena leaf powder and Mango bark powder have shown considerable effect in controlling Aspergillus infection in silkworm at all concentrations tested.

• 생약학회지
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• 제38권3호통권150호
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• pp.270-276
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• 2007

To evaluate the leaf shoots and stem barks of Kalopanax pictus (Araliaceae) as an edible vegetable and a traditional medicinal drug, respectively, the compounds of syringin, liriodendrin, astragalin, quercetin, and kalopanaxsaponins were quantitatively measured by HPLC analysis. The leaf shoot exhibited low contents of syringin, liriodendrin and kalopanaxsaponins but a high chlorogenic acid content, whereas the grown leaves contained very high amounts of kalopananxsaponins. In contrast, the stem bark had very high amounts of syringin and liriodendrin and relatively low kalopanaxsaponins. In particular, the kalopanaxsaponin contents were rapidly increased with monthly variation until October but decreased from September. It was also observed that the leaf shoot contained chlorogenic acid by 30.73 mg/g and the barks showed the concentration of liriodendrin by 20.75 mg/g. These results indicate that high contents of syringin and liriodendrin in the stem bark and high contents of chlorogenic acid in the leaf shoot support scientific bases on the traditional uses of K. pictus as a medicinal drug and a functional food, respectively.

• 한국농림기상학회지
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• 제7권4호
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• pp.258-264
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• 2005

The objectives of this study were to study 1) emergence of pine bark beetles, 2) larval density in residual timber on Idlest land by each felling season, and 3) the secondary damage rates in the tended forest. Pine forest land which had undergone tending had a higher secondary damage ratio $(59.6\%)$ by pine bark beetles than forest land that was not tended $(2.8\%)$. The number of escape holes averaged 11.3 0.31 per $250 cm^2$ on the bark of leaf trees in the tended forest. The number of escape holes was higher in the Jinju site than in the Hamyang site. The larval habitat density of pine bark beetles as compared with each felling period was higher after mid-October than in forests tended early in October. Thus, forests should be tended before early October in order to prevent secondary damage from pine bark beetles. Secondary damage in the tended forest was higher in the upper part $(75.5\%)$ of the tree crown than in the lower part $(49.2\%)$. The damage was higher in terminal shoots $(80\%)$ than in lateral shoots $(48\%)$. Therefore, secondary damage by pine bark beetles can cause deterioration of the elongation growth of the forest trees. In conclusion, if by-products of tended pine forest forests are neglected, they will be utilized as a propagation site for pine bark beetles (Blastophagus piniperda L). The propagated adults will damage the tender shoots of the leaf trees and thus seriously limittheir elongation.