• 생약학회지
• /
• 제41권4호
• /
• pp.245-249
• /
• 2010

As part of ongoing study focused on the discovery of natural antioxidants from Korean plants by measuring the DPPH (1,1-diphenyl-2-picrylhydrazyl) radical scavenging effect and superoxide quenching activity, methanol extract of Cedrela sinensis (Meliaceae) was found to show potent antioxidant activities. Subsequent activity-guided fractionation of the methanolic extract led to the isolation of four phenolic compounds, (+)-catechin (1), (-)-epicatechin (2), catechin-($4{\alpha}{\rightarrow}8$)-catechin (3) and catechin-($4{\alpha}{\rightarrow}8$)-epicatechin (4). Their structures were elucidated by spectroscopic studies. These compounds showed the significant antioxidative effects on DPPH. In riboflavin originated superoxide quenching activity, four compounds exhibited the formation of the blue formazan in a dose dependant manner.

• 대한기관식도과학회지
• /
• 제9권1호
• /
• pp.30-38
• /
• 2003

Cancers of the cervical esophagus occur uncommonly, but treatment is remaining a challenging problem and surgery demands special knowledge of abdominal, thoracic, and neck surgery. The primary risk factor is chronic heartburn, leading to a sequence of esophagitis, Barrett's esophagus, reflux esophagitis and etc. Among the various treatment modalities, Surgery is still a mainstay of treatment. The main aim of surgery is not only oncologically adequate resection but also preservation or restoration of physiologic functions, such as deglutition and phonation. Surgical treatment of cervical esophageal cancer is influenced by special problems arising from tumor factors, patient factors and surgeon factors. Complete clearance of loco-regional disease and prevention of postoperative complications are of particular importance for the improvement of long-term survival in patients with these cancers. So the cervical and thoracic extension of these tumors usually required an extensive lymphadenectomy with primary resection. Radical resection of the primary site almostly include sacrifice of the larynx, but the voice could be rehabilitated with various methods, such as tracheoesophageal prosthesis or tracheoesophageal shunts, etc. Restoration of the esophageal conduit can be performed using gastric or colon interposition, radial forearm free flap or jejunum free flap, etc. Recently, the advances of radiation therapy and chemotherapy will enable less extended resections with greater rates of laryngeal preservation. At initial presentation, up to 50％ to 70％ of patients will have advanced locoregional or distant disease with virtually no chance for cure. Patients with advanced but potentially resectable esophageal cancer are generally treated by surgery with some form of neoadjuvant chemotherapy, radiotherapy, or both, with 5-year survivals in the 20％ to 30％ range. So the significant adverse factors affecting survival should be taken into account to select the candidates for surgery.

• 한국약용작물학회지
• /
• 제21권1호
• /
• pp.1-6
• /
• 2013

Buckwheat (Fagopyrum esculentum) has been known for having strong anti-oxidant, anti-mutagenic, and anti-carcinogenic activities. The free radical theory of aging, also known as the oxidative stress theory of aging, claims that cellular oxidative damage accumulated with time is a major causal factor of aging. In the present study, we investigated the effect of buckwheat extracts on resistance to oxidative stress and aging using Caenorhabditis elegans as a model system. Survival under an oxidative-stress condition induced by paraquat increased markedly following 500mg/L buckwheat extracts treatment, suggesting lower cellular oxidative damage by buckwheat extracts. A lifespan assay also revealed that treatment of buckwheat extracts significantly extended both the mean and maximum lifespan in C. elegans. Interestingly, this lifespan-extension by buckwheat extracts was not accompanied by reduced fertility. These findings suggest that buckwheat extracts can confer longevity phenotype to C. elegans through its strong anti-oxidant activity and support the aging theory which emphasizes a pivotal role of oxidative stress during aging.

• 대한두경부종양학회지
• /
• 제10권2호
• /
• pp.106-111
• /
• 1994

During a 9-year period(March 1985 to February 1994), 111 consecutive total thyroidectomies and modified or radical neck dissections were performed at 81. Vincent Hospital, Catholic University Medical College, for benign and malignant disease. There were three permanent complications, persistent hypoparathyroidism, in total thyroidectomies. Overall complications were observed 20(62.5%) in benign diseases, 47(59.5%) in malignancy. In benign and malignant thyroid diseases. the complications were transient hypoparathyroidisms (28.8%), transient hoarsenesses(21.6%), wound infections (3.6%), bleedings(3.6%), and permanent hypoparathyroidisms(2.7%). Our experience suggests that the morbidity of total thyroidectomy relates primarily to the extracapsular extension, necessitating en bloc exision accompanied by additional lymph node dissection. The low incidence of permanent complications in thyroid disease suggests the feasibility of total thyroidectomy as the operation of choice when surgeons are familiar with the technique and indications.

• Journal of Chest Surgery
• /
• 제33권8호
• /
• pp.688-692
• /
• 2000

Descending Necrotizing Mediastinitis(DNM) is a complication of oropharyngeal infections that can spread to the mediastinum. It is difficult to diagnose early because clinical and radiologic findings appear in the late stage of the infection. late diagnosis is the principal reason for the high mortality in DNM. An 18-year-old female admitted with Ludwig's angina from dental caries. Despite of combined antibiotics, dental extraction and drainge of submental abscess, infection spread to the cervical area. Chest computed tomogram revealed extension of the abscess to the pretracheal and periaortic space and development of bilateral pleural empyema. We performed bilateral cervical mediastinotomy and thoracotomy for drainage and debridement. Tracheostomy to secure the airway and postoperative pleural irrigation were performed. Postoperative course was uneventful and patient was discharged on the 40th postoperative day. It is important to perform chest CT scanning for early diagnosis of DNM when oropharyngeal infection spreads to the cervical area. Improved survival of patients with DNM implies early and radical surgical drainage and debridement via a cervical mediastinomy and thoracotomy.

• 한국자원식물학회:학술대회논문집
• /
• 한국자원식물학회 2019년도 추계학술대회
• /
• pp.76-76
• /
• 2019

The purpose of this study was to evaluate the antioxidant and whitening action of Fagopyrum esculentum and F. tataricum buckwheat seeds depending on their germination time. In a previous study, we reported significant changes in sprout yield and phytochemical content in ethanol extracts from F. esculentum and F. tataricum seeds with increase in germination times. DPPH radical scavenging activities of F. tataricum increased with increasing germination time, whereas that of F. esculentum decreased. Next, we investigated anti-melanogenic activities of these species by estimation of melanin content and tyrosinase activity. Inhibition of melanin production in ${\alpha}-MSH$ (${\alpha}$-melanocyte stimulating hormone)-induced B16F10 cells by extracts from these seeds were analyzed. Among the two, F. tataricum extracts were characterized by higher inhibitory activity against melanin production. In addition, when B16F10 cells were incubated with L-DOPA for detection of in situ tyrosinase activity, F. tataricum and F. esculentum extracts were observed to reduce melanin production in cells. Taken together, these results indicate that extracts from buckwheat seeds could influence cellular processes via modulation of tyrosinase activity. Hence, buckwheat seeds could be utilized as whitening agents in the cosmetic industries and as therapeutics for hyperpigmentation disorders in a clinical setting.

• 영어영문학
• /
• 제56권6호
• /
• pp.1119-1133
• /
• 2010

This paper explores Myung Mi Kim's poetics of the archive in Commons. Commons begins with a gesture that critiques a prior act of archivization: "Here, this speck and this speck that you missed." As the poems accrue in the book, Commons demonstrates the desire to record those experiences that have been neglected by the architects of traditional archives while at the same time interrogating the very logic of the archive. Crucial to that interrogation is the poetic form. Kim's attempt to archive silences and gaps leads to a radical experiment with form and language. It reformulates the archive as an open system amenable to interruption, extension, and revision. I examine in detail the techniques that contribute to her poetics of the archive, a poetics that draws the readers out of the narrow confines of their personal experiences and their political identities. By juxtaposing Kim's poems with her statements of poetics given as interviews, this paper connects the project of Commons to Kim's larger concern with open form and experimental writing. I argue that the "difficulty" of her poetry should be reinterpreted as a demand that her text makes on the readers to broaden their terms of engagement. The linguistic experiment of Commons provides an occasion to rethink the habitual ways in which time is experienced, national histories are written, and literary works are consumed.

• 한국미생물·생명공학회지
• /
• 제38권3호
• /
• pp.283-288
• /
• 2010

본 연구에서는 최근 국내재배가 시작한 D. alata L. 경북 6호의 성분 및 색차를 D. batatas 경북 1호와 비교 분석하였으며, 메탄올 추출물 및 이의 분획물의 항산화 및 항균력을 비교 평가하였다. 먼저 경북 6호의 경우, 수분함량은 $78.02{\pm}0.16%$로 경북1호의 $82.6{\pm}0.07%$로 다소 낮았으며, 조지질 함량은 1.7배 높았다. 반면 조단백 및 조섬유 함량은 경북 1호가 경북6호보다 1.6배정도 높았다. 회분 함량은 유사하였다. 절단면의 색차는 경북 6호의 명도가 60.7, 황색도가 11.01로 경북1호의 명도 65.33, 황색도가 4.85보다 약간 어두운 황색을 띄었다. 총 polyphenol함량은 경북 6호가 평균 89.45 mg/g으로 경북 1호의 43.91 mg/g의 2배에 해당하였으며, 특히 ethylacetate 분획은 $144.1{\pm}3.20\;mg/g$의 매우 높은 함량을 나타내었다. 총 flavonoid 및 총당 함량은 비슷하였다. DPPH radical 소거능 평가 결과, 경북 6호는 ethylacetate 분획 > methanol 추출물 > butanol 분획 > hexane 분획 > 물 분획 순으로 우수하였으며, 가장 우수한 소거능을 나타낸 ethylacetate 분획의 $IC_{50}$는 $78.32\;{\mu}g/mL$이었다. 환원성 평가 결과, 물분획 > methanol 추출물 > ethylacetate 분획 > butanol 분획 > hexane 분획 순으로 나타나 수용성 물질이 강력한 환원성을 나타내었다. 한편 경북 6호의 n-hexane 및 ethylacetate 분획에서 B. subtilis, L.monocytogenes, S. epidermidis, S. aureus, P. vulgaris, 및 S. typhimurium에 대해 우수한 항균력을 나타내었다. 본 연구 결과는 국내 재배된 D. alata L.의 기초자료로 이용될 것이다.

• 한국버섯학회지
• /
• 제19권3호
• /
• pp.166-175
• /
• 2021

원형질체 융합 기술은 종·속간 유전적 한계를 넘어 육종과 그 소재로 활용하고데 목적이 있다. 본 연구에서는 '흑타리'(P. ostreatus)와 '호산'(P. pulmonarius)의 단핵균사를 이용하여 원형질체를 나출하고 나출된 원형질체를 융합하여 종간 교배 계통을 육성하였다. 육성계통의 균사생장속도는 '호산', '흑타리', PF160313, PF160306 계통 순으로 빠른 편이었다. 균사 밀도는 PF160306 계통이 가장 높았고, 나머지는 중간 수준의 밀도를 나타내었다. 원형질체 융합계통인 PF160306과 PF160313 계통은 '흑타리' 품종보다 배양 기간이 10일, '호산' 품종보다 2일 단축되었다. 자실체 생장 기간은 '흑타리'와 '호산에 비하여 각각 3일, 1일 단축되었다. PF160306 계통의 생산량은 135.9 g/병으로 '호산'에 비하여 높았으나 통계적으로 유의차가 없었다. 자실체 발생기간은 15℃에서 9일, 25℃에서 4.5일로 온도가 높아짐에 빨라졌다. 자실체의 갓색은 21℃ 노란색이 가장 선명하게 발현되었다. URP primer 7을 사용하여 PCR 밴드 패턴을 비교하였을 때, 전체적으로 '호산' 품종과 유사하였다. DPPH radical 소거능과 폴리페놀 함량에 있어 '순정'은 각각 62.5%, 43.5 mg/mL였으며, PF160313 계통은 각각 65.7%, 49.9 mg/mL를 나타내어 계통간 유의차가 있었다. ACE 활성은 '순정' 74%, PF160313 계통 75%로 유사한 수준이었다.

• 한국식품과학회지
• /
• 제39권5호
• /
• pp.569-574
• /
• 2007

화살나무잎을 이용하여 열수추출물에 대한 항산화활성 및 생리 활성과 화살나무잎을 고온에서 덖음처리시 가열처리가 화살나무잎의 생리활성 물질에 미치는 영향을 검토하기 위해 덖음처리 한 것과 덖음처리하지 않은 시료에 대한 항산화 활성, ${\alpha}-amylase,\;{\alpha}-glucosidase$ 및 염증억제효과를 분석하였다. 화살나무잎 열수추출물에 대한 총폴리페놀 함량은 덖음처리하지 않은 시료 10.6 mg/g, 덖음 처리한 시료 9.6 mg/g로 덖음처리하지 않은 시료가 다소 높게 나타났다. DPPH 라디칼 소거능은 덖음처리 하지 않은 시료의 항산화 활성$(19.1{\mu}g/mL)$이 덖음처리한 시료$(21.9{\mu}g/mL)$보다도 좋은 활성을 보여주었다. Hydroxyl 라디칼 소거능은 덖음처리한 시료와 덖음처리하지 않은 시료, 모두 농도의 증가에 따라 hydroxyl radical이 감소하는 경향을 보여주어 농도 의존적인 저해효과를 나타냈다. SOD유사활성은 농도에 의존하는 경향을 보여주었고, 화살나무 잎의 열수추출물에 대한 대조구인 ascorbic acid의 경우, 3 mg/mL에서 52%의 SOD 유사활성을 보인 반면, 덖음처리하지 않은 시료가 20%, 덖음처리한 시료가 18%로 덖음처리하지 않은 시료가 다소 높은 SOD 유사활 성도를 나타내었다. ${\alpha}-Amylase$ 저해효과는 화살나무 잎의 열수추출물은 농도의 증가에 따라 효과가 낮아졌고, 덖음처리한 시료가 덖음처리하지 않은 것에 비해 다소 좋은 효과를 보여주었다. 그러나 ${\alpha}-glucosidase$ 저해효과에 대한 활성은 거의 없었다. 대식세포 Raw 264.7세포를 이용한 화살나무잎 열수추출물의 항염증활성 효과는 LPS로 활성화시킴과 동시에 화살나무잎 열수추출물을 첨가하고 18시간 경과한 후 생성된 NO의 양을 측정하여, 덖음처리한 시료와 덖음처리하지 않은 시료 모두에서 농도의존적인 NO 생성억제효과가 확인되었다. MIT를 이용한 화살나무잎 열수추출물의 세포생존율은 덖음처리하지 않은 시료의 경우, 열수추출물의 첨가량이 증가하여도 세포생존율이 일정하게 나타났지만, 덖음처리 한 시료는 열수추출물의 첨가량 증가와 함께 세포생존율이 감소하였다.