18 research outputs found

    Additional phenanthrene alkaloid isolated from the leaves of Cryptocarya nigra (Lauraceae)

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    Previous studies on alkaloidal constituents isolated from the bark of Cryptocarya nigra (Lauraceae), a perennial widely distributed in the forest of Malaysia, have revealed that it is a good source of phenanthrene alkaloids 2-4. The phytochemical study of this bark extract has led to the isolation and characterization of three known phenanthrene alkaloids: 2-hydroxyathersperminine 2, atherosperminine 3, and noratherosperminine 4. The author now reports the isolation, identification and chracterisation of an additional known phenantrene alkaloid, argentinine 1, where the plant specimens were collected from Hutan Simpan Ulu Sat, Machang, Kelantan (Malaysia). Structural elucidation of argentinine 1 alkaloids was established through several spectroscopic methods such as 1D-NMR, IR, UV and LCMS, and comparison with published data

    RESISTANCE PREDICTION OF 6M HOUSEBOAT

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    This project is performed to build an optimum operating 6m pontoon houseboat equipped with a double hull. This study will revolve around the resistance prediction topic. Research is performed through academic resources to find the most accurate and applicable theories. The resistance prediction is estimated by a mathematical program named Michlet. This program applied the theory of Michell\u27s thin ship theory. then result will be verified in Software for Resistance Prediction-Round Bilge Catamaran (Molland) that is practicing Insel and Molland method. Houseboat will be in normal condition when operating in fresh water. At the end of this investigation, the expected outcomes are the most suited resistance prediction will be discovered
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