• 제목/요약/키워드: $\beta$-type

검색결과 2,066건 처리시간 0.038초

초임계 이산화탄소를 이용만 우렁쉥이 껍질로부터 ${\beta}$-carotene 추출 (Extraction of ${\beta}$-carotene from Ascidian Tunic [Halocynthia roretzi] using Supercritical Carbon Dioxide and Co-solvent)

  • 강인숙;윤현석;박지연;전병수
    • KSBB Journal
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    • 제21권3호
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    • pp.194-198
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    • 2006
  • 본 연구는 초임계 이산화탄소와 에탄올 보조용매를 사용하여 천연물질에 존재하는 기능성 물질을 효율적으로 분리하여 식품 및 의약산업에 이용할 수 있는 천연 기능성 소재를 제공할 수 있는 가능성을 보여 주었다. 초임계 이산화탄소와 보조용매 에탄올 3 mL/min를 사용하여 멍게로부터 ${\beta}$-carotene을 추출하기 위한 최적의 조건은 $35^{\circ}C$, 350 bar이었으며, 추출물질을 흡착하는 흡착칼럼으로부터 ${\beta}$-carotene을 회수하기 위한 rinse 용매는 methanol이 우수한 결과를 나타내었다. 따라서 초임계 이산화탄소를 사용한 멍게 껍질로부터 ${\beta}$-carotene 추출 공정이 상업화될 경우 기존의 재래식 유기용매 추출법에서 회수한 것에 비해 잔존 유기용매가 없고 환경 친화적 공정으로 식품, 의악품 산업 등의 고품질 원료 소재로 이용될 수 있을 것으로 사료된다.

교정시설 종사자의 직무소진 영향 요인 (Determinants influencing on the Burnout of correctional workers)

  • 김도연;김현진
    • 한국산학기술학회논문지
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    • 제20권8호
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    • pp.560-569
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    • 2019
  • 본 연구의 목적은 교정시설 종사자들의 소진에 영향을 미치는 요인들을 살펴보는 것이다. 이를 위해 한국법무보호복지공단에 근무하는 종사자들을 대상으로 2018년 2월에 설문을 실시하였으며, 290명의 자료가 최종분석에 포함되었다. 소진에 미치는 요인들을 탐색하기 위하여 개인적 특성, 직무관련 특성, 직무스트레스, 대인관계 스트레스 요인을 주요변수로 구성하였다. 주요변수 측정을 위해 소진은 Baslach 소진척도를 사용하였으며, 직무와 대인관계 스트레스는 한국판 직무스트레스 척도(KOSS)와 한국판 대인관계 스트레스 척도(KIRS)를 사용하였다. 소진에 미치는 영향을 알아보기 위해 기술분석, 상관분석, 위계적 회귀분석을 실시하였다. 상관분석 결과 척도 간 서로 통계적으로 유의미한 상관(p<.01)이 있는 것으로 나타났다. 최종 모형에 따라 소진에 대한 상대적 영향력을 비교하였을 때, 직무 스트레스(직무요구 ${\beta}=.308$, p<.001, 직무자율 ${\beta}=.124$, p<.001, 관계갈등 ${\beta}=.169$, p<.001), 대인관계 스트레스(상사와 관계 ${\beta}=.402$, p<.001, 보호대상자와 관계 ${\beta}=.155$, p<.01), 개인적 특성(성별 ${\beta}=.173$, p<.01) 순으로 나타났다. 4가지 모형을 비교한 결과 개인적 특성과 직무관련 특성이 소진에 영향을 미치지만 높은 직무스트레스와 대인관계 스트레스로 인해 더 높은 소진을 경험하는 것을 의미한다. 연구결과를 기반으로 교정시설 종사자들의 소진을 낮추기 위한 제언과 연구의 한계점을 제시하였다.

난황 콜레스테롤 및 계란 품질에 관한 식이내 베타-사이클로덱스트린의 효과 (Effect of Dietary β-Cyclodextrin on Egg Quality and Cholesterol Content of Egg Yolks)

  • 박병성
    • 한국식품영양과학회지
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    • 제33권4호
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    • pp.614-620
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    • 2004
  • 본 연구의 주목적은 난황 콜레스테롤 함량 및 계란 품질에 관한 식이내 베타사이클로덱스트린($\beta$CD)의 효과를 조사하는 것이었다. 29주령 산란계 100마리를 이용하여 각각 20마리씩의 5그룹으로 나누어서 완전임의 배치하였으며 실험 10주기간 동안에 각각의 산란 케이지 내에서 수용하였다. 산란계의 식이는 순수한 $\beta$CD를 0, 3, 5, 7 또는 10% 함유하는 5개의 처리구로 나누었다. 암탉의 식이섭취량, 산란율, 난중은 $\beta$CD 무첨가구와 $\beta$CD 3, 5, 및 7% 첨가구 사이에 서로 비슷하였으나 $\beta$CD 10% 첨가구는 유의적으로 낮아졌다(p<0.05). 식이요구율을 계란 1개당으로 표시했을 때 식이내 $\beta$CD 첨가수준과 차이는 없었으나 $\beta$CD 10% 첨가구에서 유의적으로 손상되었다(p<0.05). $\beta$CD 첨가는 호우유니트, 난황색 및 난각두께에 아무런 영향을 주지 않았다. 난황 g당 콜레스테롤 함량은 $\beta$CD 무첨가구와 비교할 때 $\beta$CD 3, 5, 7 및 10% 첨가구에서 각각 3.76, 5.12, 5.49 및 6.48 mg씩 유의적으로 낮아지는 경향을 보였다(p<0.05). 계란 60 g당 콜레스테롤 함량은 $\beta$CD 무첨가구와 비교할 때 $\beta$CD 3, 5, 7 및 10% 첨가구에서 각각 54, 71, 77 및 86 mg으로 감소하는 경향이었다(p<0.05). 가장 획기적인 효과는 산란계 식이내 $\beta$CD 5%와 7% 첨가구에 의해서 난황 콜레스테롤 함량이 각각 28.19% 및 30.23%까지 감소한 관찰이었다. 이상의 결과로 $\beta$CD의 첨가 급여는 난황의 콜레스테롤 함량을 낮출 수 있으며 콜레스테롤 함량이 낮아진 기능성 계란을 생산할 수 있을 것으로 본다.

제주산 배초향 지상부에서 얻은 정유의 조성과 항산화 효과 (DPPH Radical Scavenging Activity and Composition of Essential Oil from the Herbs of Jeju Agastache rugosa)

  • 문영건;홍준석;송민호
    • 생명과학회지
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    • 제22권2호
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    • pp.156-160
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    • 2012
  • 수증기증류법으로 얻은 제주산 배초향의 정유는 DPPH radical 소거활성이 현저하게 뛰어나는 것을 확인할 수가 있었다. 제주산 배초향의 유효성분을 확인하기 위해 정유성분을 GC-MS로 분석한 결과 각 성분의 retention time및 mass spectral data의 표준 물질과의 비교에 의해서 Pulegone, L-menthone, DL-limonene, Isopulegone, beta-caryophyllene, beta-myrcene, estragole. 등의 정유성분이 확인되었다. 이 연구에서 밝혀진 여러 성분들은 천연유기합성물로 항산화 활성이 잘 알려져 있어 이들이 그 유효성분으로 추측된다. 연구결과 제주산 배초향 정유는 식품 보존제 및 항산화 대체 물질로 개발이 적합하다.

Identification of MFGE8 in mesenchymal stem cell secretome as an anti-fibrotic factor in liver fibrosis

  • Jang, Yu Jin;An, Su Yeon;Kim, Jong-Hoon
    • BMB Reports
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    • 제50권2호
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    • pp.58-59
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    • 2017
  • The beneficial paracrine roles of mesenchymal stem cells (MSCs) in tissue repair have potential in therapeutic strategies against various diseases. However, the key therapeutic factors secreted from MSCs and their exact molecular mechanisms of action remain unclear. In this study, the cell-free secretome of umbilical cord-derived MSCs showed significant anti-fibrotic activity in the mouse models of liver fibrosis. The involved action mechanism was the regulation of hepatic stellate cell activation by direct inhibition of the $TGF{\beta}$/Smad-signaling. Antagonizing the milk fat globule-EGF factor 8 (MFGE8) activity blocked the anti-fibrotic effects of the MSC secretome in vitro and in vivo. Moreover, MFGE8 was secreted by MSCs from the umbilical cord as well as other tissues, including teeth and bone marrow. Administration of recombinant MFGE8 protein alone had a significant anti-fibrotic effect in two different models of liver fibrosis. Additionally, MFGE8 downregulated $TGF{\beta}$ type I receptor expression by binding to ${\alpha}v{\beta}3$ integrin on HSCs. These findings revealed the potential role of MFGE8 in modulating $TGF{\beta}$-signaling. Thus, MFGE8 could serve as a novel therapeutic agent for liver fibrosis.

Construction of a New Gene-Fusion Expression Vector, pMONSTER

  • Baek, Chang-Ho;Wee, Sec-Han
    • Journal of Microbiology and Biotechnology
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    • 제10권5호
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    • pp.663-669
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    • 2000
  • The fur (ferric uptake regulation) expression vector pMON2064 was modified to produce a Fur-fusion expression vector. A kinker site, factor Xa cleavage site, and several restriction endonuclease sites were introduced to facilitate easy cloning and isolating of the fusion protein. The resulting fusion expression vector, pMONSTER, was then used to make fusion expression vector, pMONSTER, was then used to make fusion proteins with $\beta$-galactosidase and the protease of the human immunodeficiency virus type 1 (HIV-1 PR). Strain SW4020 harboring the Fur $\beta$-galactosidase fusion vector produced blue colonies on a 5-bromo-4-chloro-3-indolyl-$\beta$-D-galactoside plate and the resulting 133 kDa fusion protein reacted with an anti-Fur antibody. The strain harboring the Fur-HIV-1 PR fusion vector produced a 29 kDa fusion protein, which also reacted with an anti-Fur antibody. The Fur-HIV-1 PR fusion protein was purified by a single column application that was designed to isolate the Fur protein. The purified Fur-HIV-1 PR fusion protein digested with factor Xa cleaved a recombinant Gag protein to release smaller fragments, including a p24 capsid protein. The Fur-HIV-1 PR fusion protein itself did not exhibit any proteolytic activity.

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Isolation, structure elucidation and physicochemical properties of novel antibiotic polypeptide, $\varepsilon-(L-\beta-Iysine)$ polypeptide from Streptomyces sp. DWGS2

  • Donghyuk Shin;Kim, Daesung;Lee, Deoggeun;Lee, Hyeongkyu;Hoshik Won
    • 한국자기공명학회논문지
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    • 제6권1호
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    • pp.69-77
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    • 2002
  • During the screening of material which has the antimicrobial activity against aminoglycoside-resistant bacteria, A new material $\varepsilon$-(L-$\beta$-Iysine) polypeptide from a culture medium of Streptomyces sp.(DWGS2) was isolated, and the structure and the physicochemical properties of the new material were elucidated. The new material was separated by column chromatography of the culture medium using Dowex1$\times$2, Silica gel, and Sephadex LH20 etc. The chemical structure and molecular weight were determined with the data of various NMR experiments, MALDI mass, and ESI mass experiments. The antimicrobial activity of $\varepsilon$-(L-$\beta$-Iysine) polypeptide is not only better than equal to the activity of known aminoglycoside type of antibiotics(MIC=3.125 - 6.25ug/mL) but also effective against aminoglycoside-resistant bacteria and fungi. If the mechanism of antimicrobial activity against aminoglycoside- resistant bacteria is figured out, the $\varepsilon$-(L-$\beta$-Iysine) polypeptide can be utilized for the treatment of diseases caused by aminoglycoside-resistant bacteria.

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Localizing Growth Model of Chamaecyparis obtusa Stands Using Dummy Variables in a Single Equation

  • Lee, Sang-Hyun;Kim, Hyun
    • 한국산림과학회지
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    • 제94권2호통권159호
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    • pp.121-126
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    • 2005
  • This study was carried out to construct a single diameter and a single height model that could localize Chamaecyparis obtusa stand grown in 3 Southern regions of Korea. Dummy variables, which convert qualitative information such as geographical regions into quantitative information by means of a coding scheme (0 or 1), were used to localize growth models. In results, modified form of Gompertz equation, $Y_2={\exp}({\ln}(Y_1){\exp}(-{\beta}(T_2-T_1)+{\gamma}({T_2}^2-{T_1}^2))+({\alpha}+{\alpha}_1Al+{\beta}_1k_1+{\beta}_2k_2)(1-{\exp}(-{\beta}(T_2-T_1)+{\gamma}({T_2}^2-{T_1}^2))$, for diameter and height was successfully disaggregated to provide different projection equation for each of the 3 regions individually. The use of dummy variables on a single equation, therefore, provides potential capabilities for testing the justification of having different models for different sub-populations, where a number of site variables such as altitude, annual rainfall and soil type can be considered as possible variables to explain growth variation across regions.

화상환자의 수술 중 저체온 발생 빈도와 체온변화에 영향을 미치는 요인 (Incidence of Hypothermia and Factors Associated with Body Temperature Changes during Surgery in Burned Patients)

  • 배혜영;김현정
    • Journal of Korean Biological Nursing Science
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    • 제18권4호
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    • pp.231-238
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    • 2016
  • Purpose: The study aimed to evaluate the changes of body temperature and to identify the factors related to changes during surgery in burned patients. Methods: A retrospective study was conducted by reviewing the medical records of 439 adult burned patients who had a surgery under general anesthesia at the Burn Center of a university hospital. Results: After surgery, body temperature of the burned patients declined from $36.6^{\circ}C$ to $35.2^{\circ}C$; 52.2% were hypothermia. There were significant differences in the changes of body temperature according to the participants' characteristics including American society of anesthesiologists physical status, type of burn injury, total burn surface area, range of exposure, operation time, anesthesia time, amount of fluid, blood transfusion, use of tourniquet, and the method of warming therapy. Factors that influence the temperature changes were total burn surface area (${\beta}=0.26$), operation time (${\beta}=0.25$), amount of fluid (0.20), and warming therapy including 'Room temperature setting + Heated circuit + Hot line'(${\beta}=0.09$) and 'Room temperature setting+one of others'(${\beta}=0.08$). Conclusion: Burned patients experienced a decrease of their body temperature during surgery despite of warming therapy. A nursing protocol is needed to provide an appropriate warming therapy based on their characteristics in burned patients.

새로운 Baculovirus 전이벡터를 이용한 Escherichia coli ${\beta}$-galactosidase 유전자의 발현 (Expression of Escherichia coli ${\beta}$-galactosidase Gene by New Transfer Vector of Baculovirus)

  • 우수동;김우진;김혜성;진병래;강석권
    • 한국미생물·생명공학회지
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    • 제24권1호
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    • pp.72-76
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    • 1996
  • To investigate the expression efficiency of new transfer vector of Bombyx mori nuclear polyhedrosis virus (BmNPV), Escherichia coli lacZ gene was inserted into new transfer vector pBmKSK1, under the control of polyhedrin promoter and expressed in BmN-4 cells and larvae of silkworm, Bombyx mori. The recombinant virus containing lacZ gene was isolated from BmN-4 cells coinfected with transfer vectro pBmKSK1-LacZ and wild type BmNPV genome, and analysed by Southern blotting. The expression of ${\beta}$-galactosidase was characterized by SDS-PAGE, Western blotting and ${\beta}$-galactosidase activity assay. The results showed that the level of expression in silkworm larvae was higher than that of BmN-4 cells.

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