^Äëíê~Åí= Sixteen medicinal herbs were selected from a database on traditional herbal materials as well as literature on Korean plant resources. Then ethanol (70%, v/v) extracts of these herbs were tested for inhibition of the urease activity of eÉäáÅçÄ~ÅíÉê= éóäçêá. The urease activity of eK= éóäçêá was strongly (82%) inhibited by extract of cçêëóíÜá~= ëìëéÉåë~ VAHL. Active compounds in extract of cçêëóíÜá~=ëìëéÉåë~ VAHL were first separated by batch mode solvent extraction, followed by purification by silica gel and octadecyl silica gel column chromatography using solvents of different polarity. According to NMR analysis of the last chromatographic fraction, we identified the presence of betulinic acid and oleanolic acid, which are known to have anti-inflammatory, anti-cancer, and anti-HIV viral activities. © KSBB hÉóïçêÇëW=Forsythia suspensa=s^ei, ìêÉ~ëÉ=~Åíáîáíó,=Helicobacter pylori,=Éñíê~ÅíáçåI=kjo=~å~äóëáë= fkqolar`qflk=Helicobacter pylori significantly contributes to the pathogenesis of human gastric ulcers and gastritis, which are wide spread in many countries such as South Korea and Japan [1]. Gastritis induced by H. pylori specifically requires high urease activity [2]. Urease can be used for urea estimation [3] as it hydrolyzes urea present in gastric mucus. The product, ammonia, diffuses across the cytoplasmic membrane, buffering the periplasmic space and allows growth in the presence of extracellular gastric acid [4]. Alkaline modification of the local environment facilitates long-term colonization of the host by this microorganism [5]. The essential role of urease in H. pylori was confirmed by showing that a urease-negative strain, unlike wild-type, was not recovered in piglets 3 days after challenge [2], suggesting that virulence of H. pylori can be controlled using a medicinal material that inhibits urease activity. Moreover, the literature has reported extracts of plants such as cashew apple [6], cinnamon [7], and Chinese tea (Lung Chen) [8] inhibit growth of H. pylori and urease activity. Compared to current antibiotic treatments such as metronidazole and clarithromycin, these plant extracts seem to be better G`çêêÉëéçåÇáåÖ=^ìíÜçê= =
The similarity between two groups of displaying methods is demonstrated in two ways, analytically and experimentally. A variety of layouts of the integral photography and display devices based on the point light source model is classified and analyzed in terms of projections and common/ separate image planes. In particularly, the transformation matrix is found. Simulation experiments based on the image processing were performed. The layouts, analytical formulas, and experimental results show the similarity of both groups for several layouts.
We derive an improved prescription for the merging of matrix elements with parton showers, extending the CKKW approach. A flavour-dependent phase space separation criterion is proposed. We show that this new method preserves the logarithmic accuracy of the shower, and that the original proposal can be derived from it. One of the main requirements for the method is a truncated shower algorithm. We outline the corresponding Monte Carlo procedures and apply the new prescription to QCD jet production in e + e − collisions and Drell-Yan lepton pair production. Explicit colour information from matrix elements obtained through colour sampling is incorporated in the merging and the influence of different prescriptions to assign colours in the large N C limit is studied. We assess the systematic uncertainties of the new method.
Design methods for quality generally help to improve quality over time, but do not consider change of system performance over time, resulting from degradation in components. As design methods for quality over time (performance reliability), which minimizes effects of unavoidable component degradations as well as component variations on system performance change, system model-based sampling methods using Monte-Carlo simulations have been used. But, there are main concerns related to computational efficiency and optimization in applying the sampling methods. To overcome the concerns, we propose a non-sample method for quality over time. Based on the proposed method, the process of allocating design parameters, which could minimize the noise effects with the consequence that both quality and performance reliability are optimized, is discussed. Reliability metrics such as mean time to failure and standard deviation of time to failure are optimized simultaneously for reliability improvement. Desirability functions for the metrics are introduced to perform the simultaneous optimization. The proposed method is applied to an electrical system design and compared to a sampling based design method.
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