• The study of corrosion inhibition of pyridine and its derivatives on steel using electrochemical methodsThe study of corrosion inhibition of pyridine and its derivatives on steel using electrochemical methods

    Inhibition efficiency of pyridine and its methyl derivatives Figure 5 shows a Tafel plot for steel electrode in 1.0 M HCl with the addition of different inhibitors at a concentration of 10−5 M. It is clear that when a hydrogen atom at any position in a pyridine ring is replaced by a methyl group, inhibition efficiency will increase (see Table 2...

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  • Synthesis and evaluation of a-Glucosidase and tyrosinase inhibitory activities of ester derivatives of usnic acidSynthesis and evaluation of a-Glucosidase and tyrosinase inhibitory activities of ester derivatives of usnic acid

    The 1H NMR spectrum of UE3 showed a singlet of hydroxy chelated signal at d H 13.22, an olefin proton at dH 5.91, and five methyl groups at dH 2.74, 2.54, 2.45, 2.03, and 1.78. Similar to UE2, the lack of 10-OH in usnic acid10 along with the appearance of only one acetoxycarbonyl group (dH 2.03, dC 168.6 and 26.0) indicated the esterification...

    pdf8 trang | Chia sẻ: hachi492 | Ngày: 24/02/2022 | Lượt xem: 22 | Lượt tải: 0

  • Ứng dụng giải thuật di truyền để tìm kiếm tài liệu trong kho dữ liệuỨng dụng giải thuật di truyền để tìm kiếm tài liệu trong kho dữ liệu

    Toán tử trao đổi chéo. Trong các giải thuật di truyền, trao đổi chéo tổ hợp lại các gen trong 2 nhiễm sắc thể cha mẹ để tạo ra con cái. Toán tử trao đổi chéo cho phép chúng ta xác định một điểm bắt đầu mới cho tìm kiếm cục bộ dựa trên thông tin chứa trong quần thể hiện tại. Mục đích của trao đổi chéo là xác định các vùng của không gian tìm kiếm...

    pdf10 trang | Chia sẻ: hachi492 | Ngày: 24/02/2022 | Lượt xem: 23 | Lượt tải: 0

  • Dự đoán chức năng Protein bằng phương pháp phân cụm dữ liệuDự đoán chức năng Protein bằng phương pháp phân cụm dữ liệu

    Từ một tập gồm n đối tượng (đã xác định ma trận khoảng cách giữa chúng), với yêu cầu cần phân chia thanh k cụm, chương trình cần các tham số: Tham số −clmethod cho phép lựa chọn thuật toán phân cụm, tham số −clfun cho phép lựa chọn hàm tiêu chuẩn phân cụm, Tham số −sim cho phép lựa chọn cách tính độ đo, hai tham cuối cùng là tên tệp ma trận kho...

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  • Enthusiastic discussions on solid physic and material science at SPMS2019Enthusiastic discussions on solid physic and material science at SPMS2019

    Invited speaker Title Phuoc Huu Le (Ton Duc Thang University, Vietnam) Magnetotransport properties of bismuth chalcogenide topological insulators: a review Nguyen Minh Vuong (Quy Nhơn University, Vietnam) Pt/ZnO hierarchical nanostructures as efficient sensing materials for methanol sensors. Nguyen Duc Anh (University of Science and Techn...

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  • Establishing murine models of hepatocellular carcinoma using NOD/SCID, nude and Balb/c mice: An initial comparative studyEstablishing murine models of hepatocellular carcinoma using NOD/SCID, nude and Balb/c mice: An initial comparative study

    Histopathological results of the tumors showed that the development of hepatocellular carcinoma cells in the mouse models were accompanied by characteristics such as clumping of polymorphic cells, formation of an invasive strip, and establishment of a necrotic area inside the tumors. In addition, the cells showed an unequally divided nucleus a...

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  • Relationship between water temperature and phytoplankton communities in Ba Lai river, Viet NamRelationship between water temperature and phytoplankton communities in Ba Lai river, Viet Nam

    CONCLUSION Results of this study contributed the advantageous information on phytoplankton structure and diversity, as well as their correlation with water temperature in running water systems which are becoming more and more popular in Vietnam. The phytoplankton assemblage in the Ba Lai River was typical in the shallow and turbid estuarine sy...

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  • Forecasting of saline intrusion in Ham Luong river, Ben Tre province (Southern Vietnam) using Box-Jenkins ARIMA modelsForecasting of saline intrusion in Ham Luong river, Ben Tre province (Southern Vietnam) using Box-Jenkins ARIMA models

    The ARIMA model: advantages and disadvantages Forecast is an activity to calculate or predict future events or situations, usually as a result of rational study or analysis of suitable data21. The accurate information for saline forecast will become more and more difficult to predict due to climate change and extreme weather22. In recent years...

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  • Secretory expression of the recombinant FGF-2 protein in Pichia pastoris carrying multiple copies of target geneSecretory expression of the recombinant FGF-2 protein in Pichia pastoris carrying multiple copies of target gene

    As a result, the yield of FGF-2 protein in this study was lower than other expression systems in previous studies of P. pastoris9,21, where the culture condition was optimized for methanol concentration, pH, and induction time. Therefore, the efficiency of the P. pastoris strain in this study could be improved by optimized shake-flask condition...

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  • Chemical constituents of the ethyl acetate extract from the leaf of mugwort (Artemisia vulgaris L)Chemical constituents of the ethyl acetate extract from the leaf of mugwort (Artemisia vulgaris L)

    The HMBC correlations between proton H-6/C-2, C- 4, C-5 and C-1′, proton H-5/C-2, C-6, C-1′, and the anomer proton H-1′/C-2, C-5, C-6, C-2′, C-3′, C-4′ showed that the sugar moiety linked to the first nitrogen of the uracil skeleton (Figure 3). The above data compared with the published one indicated that 4 was uridine6. Compound 5 was obtaine...

    pdf4 trang | Chia sẻ: hachi492 | Ngày: 24/02/2022 | Lượt xem: 33 | Lượt tải: 0