• 제목/요약/키워드: the forest activity

검색결과 1,006건 처리시간 0.027초

Community Structures of Arbuscular Mycorrhizal Fungi in Soils and Plant Roots Inhabiting Abandoned Mines of Korea

  • Park, Hyeok;Lee, Eun-Hwa;Ka, Kang-Hyeon;Eom, Ahn-Heum
    • Mycobiology
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    • 제44권4호
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    • pp.277-282
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    • 2016
  • In this study, we collected rhizosphere soils and root samples from a post-mining area and a natural forest area in Jecheon, Korea. We extracted spores of arbuscular mycorrhizal fungi (AMF) from rhizospheres, and then examined the sequences of 18S rDNA genes of the AMF from the collected roots of plants. We compared the AMF communities in the post-mining area and the natural forest area by sequence analysis of the AMF spores from soils and of the AMF clones from roots. Consequently, we confirmed that the structure of AMF communities varied between the post-mining area and the natural forest area and showed significant relationship with heavy metal contents in soils. These results suggest that heavy metal contamination by mining activity significantly affects the AMF community structure.

Antioxidative Activity of Prunus sargentii Outer Bark Extractives

  • Park, Se-Yeong;Bae, Young-Soo
    • Journal of the Korean Wood Science and Technology
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    • 제40권2호
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    • pp.141-146
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    • 2012
  • The outer bark of Prunus sargentii was collected, air-dried and extracted with 70% aqueous acetone. Then it was successively partitioned with n-hexane, dichloromethane ($CH_2Cl_2$), ethyl acetate (EtOAc) and $H_2O$. From the EtOAc soluble fraction, four compounds were isolated by the repeated Sephadex LH-20 column chromatography. The isolated compounds were determined as (+)-catechin (1), (-)-epicatechin (2), taxifolin (3), and neosakuranin (4) by the spectroscopic analysis including $^1H$, $^{13}C$-NMR, and 2D-NMR spectrometers. The antioxidative activities on the isolated compounds and the separated fractions were evaluated by DPPH radical scavenging assay. The crude, EtOAc, and $H_2O$ soluble fractions indicated good antioxidative potential compared to the $CH_2Cl_2$ and n-hexane soluble fractions.

산림 산책 전후 뇌파 및 맥파 분석을 통한 치유효과 검증 연구 (Study on the Verification of Healing Effect through Brain and Pulse Wave Analyses before and after Forest Walking)

  • 김민수;염정헌
    • 한국환경과학회지
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    • 제33권4호
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    • pp.249-256
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    • 2024
  • This study aimed to verify the healing effect through brain and pulse wave analyses before and after a forest walk to the university students. Bio-signals of brain and pulse waves were measured using Omnifit Mindcare. After analyzing four brain wave items such as concentration and four pulse wave items such as heart health, it is identified that the stress level of university students was higher than that of the general public, and the brain stress level was approached to the normal range for 19 people with clear improvement. For pulse waves, a statistically significant decrease in sympathetic nerve activity (%) was confirmed. Although the slight fluctuations within the normal range were caused by short term and individual differences, it showed that the forest walking is partially effect on the relieving stress.

Optimization of submerged culture conditions for roridin E production from the poisonous mushroom Podostroma cornu-damae

  • Lee, Dong Hwan;Ha, Si Young;Jung, Ji Young;Yang, Jae-Kyung
    • 한국버섯학회지
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    • 제19권2호
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    • pp.81-87
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    • 2021
  • Roridin E, produced by Podostroma cornu-damae, is a mycotoxin with anticancer activity. To increase the content of roridin E, submerged culture conditions were optimized using response surface methodology. Three factors, namely, medium initial pH, incubation time and agitation speed were optimized using a Box-Behnken design. The optimum submerged culture conditions to increase the content of roridin E included a medium with an initial pH of 4.0, an incubation time of 12.90 days, and an agitation speed of 63.03 rpm. The roridin E content in the submerged culture, under the aforementioned conditions, was 40.26 mg/L. The findings of this study can help lower the current price of roridin E and promote its related research.

국유림 경영제도에 대한 업무담당자의 인식정도에 관한 연구 (Analysis of the Extent of National Forest-official's Recognition on the National Forest Management System)

  • 박경석;이성연;최수임;문근영;정세명;안기완
    • 한국산림과학회지
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    • 제98권4호
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    • pp.479-490
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    • 2009
  • 본 연구는 다양한 국유림 제도 가운데에서도 2004년도부터 도입된 다자참여가 가능한 산림경영대행제도, 공동산림사업, 국민의숲 제도에 대해 실태를 파악함과 동시에 활성화 방안을 모색하고자 수행하였다. 조사대상은 5개 지방산림청과 27개 국유림관리소 업무담당자를 대상으로 의식조사를 실시하였으며, 제도에 대한 문제점 및 업무 추진에 있어서 중요도와 만족도를 도출하여 활성화 방안을 제언하였다. 그 결과, 국유림 경영제도에 대한 업무의 중요 정도 인식은 협약실적에 따라 그 중요성을 다소 달리 해석하고 있는 것으로 나타났으며, 산림경영대행제도에 대한 가장 큰 문제점으로는 해당 대상자의 참여 의지 부족(4.13), 공동산림사업 제도에서는 참여자의 수익보장에 대한 한계성(3.69), 국민의숲 제도에서는 참여자의 참여투자 의지 부족(3.90)요인을 지적하였다. 국유림 경영제도에 대한 중요도와 만족도를 조사한 결과, I사면(현 상태 지속적 유지관리)은 5개요인(의사결정자의 업무추진 의지 외), II사면(최우선 투자와 관리)은 2개 요인(참여기회 및 범위확대 외), III사면(현시점에서 고려 대상이 아님)은 6개요인(협약 종료 후 사후관리 규정 마련 외), IV사면(지원 투입자체가 요구됨)은 2개 요인(신규제도 도입에 따른 업무부담 해소 외)으로 분석되었다. 국유림 경영제도의 활성화 방안으로서 국유림 경영제도에 대한 규정의 개선, 민자사업의 유도 등 사업대상자 및 범위 확대, 국유림경영제도를 전담할 수 있는 비정부 전문기관의 설립을 제안하였다.

Degradation of Crystalline Cellulose by the Brown-rot Basidiomycete Fomitopsis palustris

  • Yoon Jeong-Jun;Kim Young-Kyoon
    • Journal of Microbiology
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    • 제43권6호
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    • pp.487-492
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    • 2005
  • This study demonstrated that the brown rot basidiomycete Fomitopsis palustris was able to degrade crystalline cellulose (Avicel). This fungus could also produce the three major cellulases (exoglucanases, endoglucanases, and $\beta-glucosidase$) when the cells were grown on $2.0\%$ Avicel. Avicel degraded by F. palustris showed a decrease in relative crystallinity from $83\%\;to\;78.5\%$ after 14 days of incubation. The characterization study indicated that optimum pH was 4.5 and optimum temperature was $70^{\circ}C$ for exoglucanase (cellobiohydrolase) activity. Hydrolysis of Avicel by the crude enzyme from F. palustris yielded 1.6 mg/ml of glucose after 43 h, which corresponded to a cellulose conversion degree of $3.2\%$. Therefore, this study revealed for the first time that the brown rot basidiomycete F. palustris produces cellulases capable of yielding soluble sugars from crystalline cellulose.

Effect of Sodium Hypochlorite on the Biofilms of Aeromonas hydrophila, Streptococcus mutans, and Yersinia enterocolitica

  • Youngseok Ham;Han-Saem Park;Minjun Kim;Tae-Jong Kim
    • 한국미생물·생명공학회지
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    • 제51권1호
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    • pp.32-36
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    • 2023
  • In this study, the effect of sodium hypochlorite on biofilm removal was evaluated using three bacterial strains; Aeromonas hydrophila, Streptococcus mutans, and Yersinia enterocolitica. For maximum biofilm removal in 10 min, sodium hypochlorite is required at 1.65, 0.83, and 0.41 g/l for A. hydrophila, S. mutans, and Y. enterocolitica, respectively. Resistance to sodium hypochlorite was increased by the biofilms of all three tested strains, while the change in bactericidal activity according to sodium hypochlorite concentration was strain-specific. Therefore, we aimed to determine the effective concentration of sodium hypochlorite required for hygiene, considering that higher concentrations are needed to remove biofilms than to kill cells.

목초액의 항균활성 및 농약, 식품보존제로의 이용 가능성 (Antimicrobial Activities of Wood Vinegar and Application as Natural Fungicides and Food Preservatives)

  • 이성숙;안병준;조성택
    • Journal of the Korean Wood Science and Technology
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    • 제38권4호
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    • pp.341-348
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    • 2010
  • 목초액의 농약 또는 식품보존제로서의 이용 가능성을 검토하기 위하여 소나무 및 참나무류 기계식 목초액을 대상으로 항진균 및 항세균 활성을 검정하였다. 그 결과 항진균활성의 경우 미정제 목초액은 0.5% 이상의 농도 에서, 정제 목초액은 1.0% 이상의 농도에서 공시 식물병원균 및 목재부후균의 생장을 완전히 억제하여 미정제 목초액이 정제 목초액보다 항균활성이 높은 것으로 나타났다. 그리고 참나무류 목초액이 소나무 목초액보다 항 균활성이 높아 탄화 원료인 수종에 따라 항균활성의 차이가 있음을 알 수 있었다. 균종별로는 표고 해균인 주홍 꼬리버섯에 대한 항균효과가 다른 공시 균주에 비해 높은 것으로 나타나 균의 종류에 따라 목초액에 대한 감수성이 차이가 있는 것으로 밝혀졌다. 한편, 식품부패균 및 식중독균에 대한 항세균활성을 검정한 결과 소나무 및 참나무류 미정제 목초액의 경우 10% 농도에서 모든 공시 균주에 대해 생육저지환을 형성한 반면 정제 목초액 의 경우에는 저지환을 형성하지 않아 항세균활성도 미정제액이 정제액보다 높은 것으로 나타났다. 균종에 따른 감수성에도 차이가 있어 그람 양성균에 대한 항균활성이 그람 음성균에 비해 상대적으로 높았으나 탄화 원료에 의한 차이는 뚜렷하게 나타나지 않았다. 이상의 결과 목초액은 식물병원균, 목재부후균, 식품부패균 및 식중독 균에 대한 항균활성이 우수하여 유기합성 농약을 대체하거나 식품의 부패를 막기 위한 식품보존제로서 이용이 가능할 것으로 판단되었다.

Differences of Antioxidative Level in the Leaves and Seed Germinability among Five Natural Populations of Hibiscus hamabo

  • Han, Sim-Hee;Kim, Chan-Soo;Kim, Du-Hyun
    • 한국자원식물학회지
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    • 제21권3호
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    • pp.171-177
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    • 2008
  • Variations in antioxidant capacity of leaves and characteristics of seed germination among five Hibiscus hamabo populations in Korea were evaluated. While the leaves of H. hamabo from Shincheon contained highest Na concentration, those from Hado and Ohzo does lowest. MDA content and SOD activity didn't show significant difference among populations, but total protein and anthocyanin content were significantly different among five populations. The filled seed rates of five populations were ranged from 92.0 to 98.7%, and the moisture contents of seeds from Shinyang and Soando were lower than that of R. syriacus (5.18%). The fresh weights of H. hamabo from Hado and Ohzo were the highest and those of seeds from Shinyang and Soando were the lowest. Significant variations among H. hamabo populations were detected for all seed germination characters: percentage of germination, average germination time and germination rate and uniformity. SOD activities of seeds from Onpyoung and Soando were the highest of five populations, and total protein concentrations of seeds in Ohzo and Shinyang populations were higher than those of other populations. H. hamabo is considered exposed to salt stress and all characteristics of seed germinations were inferior to other species.

삼림경영계획(森林經營計劃)모델의 적용성연구(適用性硏究) -Model I 대 Model II- (The Application of Various Forest Resource Planning Models to Forest Management in Korea -Model I vs. Model II-)

  • 권오복;장철수
    • 한국산림과학회지
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    • 제77권4호
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    • pp.389-400
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    • 1988
  • 삼림경영계획(森林經營計劃) 모델들의 발전과정을 연대순으로 살펴 볼 때 독립적인 기능별계획(機能別計劃) 모델에서 종합적(綜合的)인 다목적이용계획(多目的利用計劃) 모델로 발전돼 가고 있으며 모델의 수학적구조(數學的構造)도 Model I 이나 Model II의 어느 한 쪽을 사용하는 단일구조(單一構造)에서 두 Model을 겸용하는 복수구조(複數構造)로 변해가고 있다. Model I과 Model II의 일반적 특성(特性), 계획상(計劃上) 차이(差異), 분석상(分析上)의 차이(差異)는 L.P.모델을 통하여 잘 설명할 수 있다. 여기에서는 공통적(共通的)인 계획자료(計劃資料)를 사용하여 L.P.문제를 수식화(數式化)해 가면서 그들의 차이점(差異點)을 비교 검토하고 Model II가 삼림(森林)의 변화(變化)를 표현하는데 있어서나 문제를 분석하는데 있어서 Model I 보다 더 간편하다는 사실을 재확인했다.

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