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AIM To study the chemical constituents and bioactivity of the roots of Patrinia scabra Bunge. METHODS The chemical constituents were isolated using various chromatographic methods, and the structures were elucidated on the basis of spectral analysis and chemical methods. In addition, cytotoxic activities toward HepG2 cells were tested by the MTT method.(More)
Satellite radar altimeter plays an important role in ocean remote sensing. In China an altimeter will be embarked on the forthcoming HY-2 satellite, which can bring significant benefits to international altimetry society. Modern altimeters adopt I/Q demodulators to detector sea echoes, so the imbalances between the in-phase (I) and quadrature (Q) channels(More)
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