• 제목/요약/키워드: Capillary potential

검색결과 116건 처리시간 0.031초

Capillary electrophoresis 및 근적외선분광분석기를 이용한 황기의 원산지 판별 (Discrimination of Geographical Origin for Astragalus Root (Astragalus membranaceus) by Capillary Electrophoresis and Near-Infrared Spectroscopy)

  • 김은영;김정현;이남윤;김수정;류미라
    • 한국식품과학회지
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    • 제35권5호
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    • pp.818-824
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    • 2003
  • 외국농산물의 국내 유입증가와 이에 따른 신속한 원산지 판별법 확립이 요구되는 가운데 최근 수입이 급증한 품목 중 하나인 황기를 선택, CE 및 NIRS를 이용하여 분석조건을 확립하고 원산지판별에의 적용 가능성을 검토하였다. CE를 이용하여 분석 시 추출은 methanol: 0.1M phosphate buffer(pH 2.5)(3:7)를 사용하였으며 uncoated fused silica capillary$(50\;{\mu}m\;I.D.{\times}27cm)$를 이용하여 $45^{\circ}C$, 14 kV로 분석, 200 nm에서 검출하였다. 분석 buffer는 0.1 M phosphate buffer(pH 2.5)에 20% methoxy ethanol과 40 mM HSA를 첨가하여 사용하였으며, 8초간 pressure injection 하였다. Peak의 재현성을 증대시키기 위하여 시료 주입 전 분석 buffer를 1분간 분석 시와 같은 방향으로(F) 흘려주고 0.1 M phosphoric acid와 1 M sodium hydroxide는 각각 4분, 5분간 반대방향으로(R) 홀려주었다. 증류수를 다시 1분간 흘려주고(R) 분석 buffer로 2분간 평형화(F) 시킨 후 시료를 주입하였다. 이상의 조건으로 국내산(97점)과 수입(113점) 황기를 분석한 결과 전체 peak의 양상은 유사하였으나 약 $11{\sim}13$분에 용출되는 2개의 peak(peak am-1, am-2)의 면적 비율에서 차이가 나타나 국산은 peak am-2가 peak am-1의 약 4배인 반면, 수입 산은 10배로 나타나 원산지 판별이 가능하였으며, 약 80%의 편별율을 나타내었다. NIRS는 국산 및 수입산 황기 raw 스펙트럼의 2차 미분 스펙트럼 R값이 0.915로 비교적 안정된 값을 얻을 수 있었고, SEP는 약 14.3%로 나타났다. 이를 국산과 수입산 황기에 적용 시 전체 판별율이 약 97%로 비교적 높은 판별율을 보였다. 또한 NIRS로 판별이 불가능한 시료가 CE로는 판별이 가능하여 이 두 기기를 함께 사용 시 상호보완하여 신속 정확한 원산지 판별법의 개발 가능성이 시사되었다.

Therapeutic potential of targeting kinase inhibition in patients with idiopathic pulmonary fibrosis

  • Kim, Suji;Lim, Jae Hyang;Woo, Chang-Hoon
    • Journal of Yeungnam Medical Science
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    • 제37권4호
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    • pp.269-276
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    • 2020
  • Fibrosis is characterized by excessive accumulation of extracellular matrix components. The fibrotic process ultimately leads to organ dysfunction and failure in chronic inflammatory and metabolic diseases such as pulmonary fibrosis, advanced kidney disease, and liver cirrhosis. Idiopathic pulmonary fibrosis (IPF) is a common form of progressive and chronic interstitial lung disease of unknown etiology. Pathophysiologically, the parenchyma of the lung alveoli, interstitium, and capillary endothelium becomes scarred and stiff, which makes breathing difficult because the lungs have to work harder to transfer oxygen and carbon dioxide between the alveolar space and bloodstream. The transforming growth factor beta (TGF-β) signaling pathway plays an important role in the pathogenesis of pulmonary fibrosis and scarring of the lung tissue. Recent clinical trials focused on the development of pharmacological agents that either directly or indirectly target kinases for the treatment of IPF. Therefore, to develop therapeutic targets for pulmonary fibrosis, it is essential to understand the key factors involved in the pathogenesis of pulmonary fibrosis and the underlying signaling pathway. The objective of this review is to discuss the role of kinase signaling cascades in the regulation of either TGF-β-dependent or other signaling pathways, including Rho-associated coiled-coil kinase, c-jun N-terminal kinase, extracellular signal-regulated kinase 5, and p90 ribosomal S6 kinase pathways, and potential therapeutic targets in IPF.

틈 내 전위측정을 통한 Alloy 600 및 Alloy 690의 틈부식 거동과 재부동태 특성 (Crevice Corrosion Behavior by Measuring the Potential Inside the Crevice and Repassivation Characteristics of Alloy 600 and Alloy 690)

  • 오세정;이재봉
    • 한국표면공학회지
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    • 제40권2호
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    • pp.82-90
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    • 2007
  • Crevice corrosion is the accelerated attack occurred in the occluded cell under a crevice on the metal surface. Crevice corrosion behaviors of nickel-based alloys such as Alloy 600 and Alloy 690 were investigated in acidic solution with different chloride ion concentrations. Tests were carried out using the specially designed crevice cell with a very narrow Luggin capillary assembly to measure the potential inside the crevice. It is believed that crevice corrosion in active/passive system like nickel-based alloys has much to do with the properties of passive film and its repassivation characteristics, investigated by the capacitance measurement and by the abrading electrode technique, respectively. An attempt was made to elucidate the relationship between crevice corrosion behaviors, properties of passive film and its repassivation kinetics. Results showed that repassivation rate parameter $n1{\leq}0.6$ and/or $n2{\leq}0.5$ indicated the possible occurrence of crevice corrosion.

Analgesic and anti-inflammatory effects of galangin: a potential pathway to inhibit transient receptor potential vanilloid 1 receptor activation

  • Kaiwen Lin;Datian Fu;Zhongtao Wang;Xueer Zhang;Canyang Zhu
    • The Korean Journal of Pain
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    • 제37권2호
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    • pp.151-163
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    • 2024
  • Background: Galangin, commonly employed in traditional Chinese medicine for its diverse medicinal properties, exhibits potential in treating inflammatory pain. Nevertheless, its mechanism of action remains unclear. Methods: Mice were randomly divided into 4 groups for 7 days: a normal control group, a galangin-treated (25 and 50 mg/kg), and a positive control celecoxib (20 mg/kg). Analgesic and anti-inflammatory effects were evaluated using a hot plate test, acetic acid-induced writhing test, acetic acid-induced vascular permeability test, formalin-induced paw licking test, and carrageenan-induced paw swelling test. The interplay between galangin, transient receptor potential vanilloid 1 (TRPV1), NF-κB, COX-2, and TNF-α proteins was evaluated via molecular docking. COX-2, PGE2, IL-1β, IL-6, and TNF-α levels in serum were measured using ELISA after capsaicin administration (200 nmol/L). TRPV1 expression in the dorsal root ganglion was analyzed by Western blot. The quantities of substance P (SP) and calcitonin gene-related peptide (CGRP) were assessed using qPCR. Results: Galangin reduced hot plate-induced licking latency, acetic acid-induced contortions, carrageenan-triggered foot inflammation, and capillary permeability in mice. It exhibited favorable affinity towards TRPV1, NF-κB, COX-2, and TNF-α, resulting in decreased levels of COX-2, PGE2, IL-1β, IL-6, and TNF-α in serum following capsaicin stimulation. Galangin effectively suppressed the upregulation of TRPV1 protein and associated receptor neuropeptides CGRP and SP mRNA, while concurrently inhibiting the expression of NF-κB, TNF-α, COX-2, and PGE2 mRNA. Conclusions: Galangin exerts its anti-inflammatory pain effects by inhibiting TRPV1 activation and regulating COX-2, NF-κB/TNF-α expression, providing evidence for the use of galangin in the management of inflammatory pain.

Regulation of Choline Transport by Oxidative Stress at the Blood-Brain Barrier In Vitro Model

  • Kang, Young-Sook;Lee, Hyun-Ae;Lee, Na-Young
    • Biomolecules & Therapeutics
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    • 제16권1호
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    • pp.14-20
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    • 2008
  • In the present study, we examined how the transport of choline is regulated at the blood-brain barrier (BBB) under the central nervous system (CNS) cellular damages by oxidative stress using a conditionally immortalized rat brain capillary endothelial cells (TR-BBB), in vitro the BBB model. It was also tested whether the choline uptake is influenced by membrane potential, extracellular pH, protonophore (FCCP) and amiloride in TR-BBB cells. In result, $[^3H]choline$ uptake was inhibited by FCCP and dependent on extracellular pH. The treatment of TR-BBB cells with 20 ng/mL tumor necrosis $factor-{\alpha}$ $(TNF-{\alpha})$, 10 ng/mL lipopolysaccharide (LPS), 100 ${\mu}M$ diethyl maleate (DEM) and 100 ${\mu}M$ glutamate resulted in 3.0-fold, 2.6-fold, 1.8-fold and 2.0-fold increases of $[^3H]choline$ uptake at the respective peak time, respectively. In contrast, hydrogen peroxide and raffinose did not show any significant effects on choline uptake. In addition, choline efflux was significantly inhibited by $TNF-{\alpha}$, LPS and DEM producing cell damage states. In conclusion, the influx and efflux transport system for choline existed in TR-BBB cell line and this process was affected by several oxidative stress inducing agents.

Simultaneous Detection of 10 Foodborne Pathogens using Capillary Electrophoresis-Based Single Strand Conformation Polymorphism

  • Oh, Mi-Hwa;Hwang, Hee-Sung;Chung, Bo-Ram;Paik, Hyun-Dong;Han, Sang-Ha;Kang, Sun-Moon;Ham, Jun-Sang;Kim, Hyoun-Wook;Seol, Kuk-Hwan;Jang, Ae-Ra;Jung, Gyoo-Yeol
    • 한국축산식품학회지
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    • 제32권2호
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    • pp.241-246
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    • 2012
  • This report outlines the development of a rapid, simple, and sensitive detection system for pathogenic bacteria using a capillary electrophoresis-based, single strand conformation polymorphism (CE-SSCP) combined with PCR. We demonstrate that this method, used with primers targeting the V4 region of the16S rRNA gene, is capable of the simultaneous detection of 10 microbes that could be associated with foodborne illness, caused by animal-derived foods: Salmonella enterica, Listeria monocytogenes, Escherichia coli O157:H7, Campylobacter jejuni, Staphylococcus aureus, Bacillus cereus, Clostridium perfringens, Yersinia enterocolitica, Vibrio parahaemolyticus, and Enterobacter sakazakii. The traditional detection techniques are time-consuming and labor-intensive, due to the necessary task of separate cultivation of each target species. As such, the CE-SSCP-PCR method, that we have developed, has the potential to diagnose pathogens rapidly, unlike the traditional technique, in order to prevent foodborne illness in a much more efficient manner.

전진하며 동요하는 2차원 특이점에 의하여 발생되는 자유표면파에 미치는 표면장력의 영향 (Surface-Tension Effects on the Flow Caused by a Two-Dimensional Pulsating Source Moving with a Constant Speed beneath the Free Surface)

  • 최항순;최재식
    • 대한조선학회지
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    • 제27권1호
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    • pp.57-62
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    • 1990
  • 본 논문에서는 표면장력 효과를 포함한 선형포텐셜이론을 이용하여 전진하며 동요하는 2차원 소오스에 의하여 발생되는 자유표면파를 해석하였다. 속도를 U, 진동수를 $\omega$ 그리고 중력가속도를 g라 할 때, ${\tau}=U{\omega}/g$로 정의된 무차원 진동수가 임계치 1/4보다 작을 때에는 6개의 파성분이 나타남을 보였다. 이 중에서 특히 2개의 파성분은 표면장력의 영향을 지배적으로 받아 소오스 앞면에 발생하는 데, 그중 하나는 전진속도 방향으로 다른 하나는 반대방향으로 매우 느리게 전파한다. 동요수가 작을 경우에는 표면장력의 영향이 약해지며 임계치 1/4보다 조금 큰 진동수에서 공진이 발생한다. 그러나 동요수가 클 때에는 (${\upsilon}={\omega}^2/g>20$) 표면장력효과가 크게 작용하여 발생파의 진폭이 감소하며 분산되어 임계치에서의 공진현상이 사라진다. 한편 전진속도가 표면장력파의 최소위상속도인 0.232m/sec일 때어는 해가 존재하지 않는다.

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모세관 기체 크로마토그래미에서 HETP에 영향을 미치는 인자 (Factors Affecting HETP in Capillary Gas Chromatography)

  • 노경호;나영진;정용안
    • KSBB Journal
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    • 제17권1호
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    • pp.88-92
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    • 2002
  • 모세관 기체 크로마토그래피에서 HETP에 영향을 미치는 인자를 고찰하기 위해서 이동상의 유량에 대한 체류분포곡선을 측정하였다. 상관도($r^2$)를 기준으로 측정된 분포곡선으로부터 1, 2차 모멘트와 HETP를 계산하여, 실험식의 매개변수를 추산하였다. 실험식은 이동상의 유속에 대한 함수로서 표시되었으며 이론적인 Golay 식도 고려하였다. 실험에 사용된 시료는 글 표피에 많이 포함된 항암제인 d-limonene와 POH이었다. 실험결과에 의하면, 유속이 증가함에 따라 d-limonene과 POH의 HETP가 증가하였다. d-limonene의 상관도는 0.8265에서 0.8465이었고, POH에서는 0.9353에서 0.9374범위를 나타내었다. $H_g$, $H_{l}$$H_{c}$를 각각 계산하여 전체 HETP에 미치는 영향을 고찰한 결과, d-limonene과 POH의 $H_{g}$가 HETP에 가장 큰 영향을 주었지만, $H_{l}$는 거의 영향을 미치지 않았다. HETP에 관하여 최적 이동상의 유속이 존재하였다.

Decision of Available Soil Depth Based on Physical and Hydraulic Properties of Soils for Landscape Vegetation in Incheon International Airport

  • Jung, Yeong-Sang;Lee, Hyun-Il;Jung, Mun-Ho;Lee, Jeong-Ho;Kim, Jeong-Tae;Yang, Jae E
    • 한국토양비료학회지
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    • 제48권5호
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    • pp.522-527
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    • 2015
  • Decision of available soil depth based on soil physical and hydraulic properties for the $3^{rd}$ Landscape Vegetation Project in the Incheon International Airport was attempted. The soil samples were collected from the 8 sites at different depths, 0-20 and 20-60cm, for the three project fields, A, B, and C area. Physical and chemical properties including particle size distribution, organic matter content and electrical conductivity were analyzed. Hydrological properties including bulk density and water holding capacity at different water potential, -6 kPa, -10 kPa, -33 kPa, and -1500 kPa were calculated by SPAW model of Saxton and Rawls (2006), and air entry value was calculated by Campbell model (1985). Based on physical and hydrological limitation, feasibility and design criteria of soil depth for vegetation and landfill were recommended. Since the soil salinity of the soil in area A area was $19.18dS\;m^{-1}$ in top soil and $22.27dS\;m^{-1}$ in deep soil, respectively, landscape vegetation without amendment would not be possible on this area. Available soil depth required for vegetation was 2.51 m that would secure root zone water holding capacity, capillary fringe, and porosity. Available soil depth required for landscape vegetation of the B area soil was 1.51 m including capillary fringe 0.14 m and available depth for 10% porosity 1.35 m. The soils in this area were feasible for landscape vegetation. The soil in area C was feasible for bottom fill purpose only due to low water holding capacity.

Capillarity-Driven Self-Assembly of Silver Nanowires-Coated Fibers for Flexible and Stretchable Conductor

  • Li, Yi;Chen, Jun;Han, Xiao;Li, Yinghui;Zhang, Ziqiang;Ma, Yanwen
    • Nano
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    • 제13권12호
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    • pp.1850146.1-1850146.9
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    • 2018
  • The rapid development of smart textiles requires the large-scale fabrication of conductive fibers. In this study, we develop a simple, scalable and low-cost capillary-driven self-assembly method to prepare conductive fibers with uniform morphology, high conductivity and good mechanical strength. Fiber-shaped flexible and stretchable conductors are obtained by coating highly conductive and flexible silver nanowires (Ag NWs) on the surfaces of yarn and PDMS fibers through evaporation-induced flow and capillary-driven self-assembly, which is proven by the in situ optical microscopic observation. The density of Ag NWs and linear resistance of the conductive fibers could be regulated by tuning the assembly cycles. A linear resistance of $1.4{\Omega}/cm$ could be achieved for the Ag NWs-coated nylon, which increases only 8% after 200 bending cycle, demonstrating high flexibility and mechanical stability. The flexible and stretchable conductive fibers have great potential for the application in wearable devices.