(-)-EGCG是最丰富的儿茶素，其被认为是化学预防及抗癌剂。然而，(-)-EGCG具有至少一个局限性：其生物利用度差。本发明提供了具有下列通式的化合物，其中R11、R12、R13、R21、R22、R2、R3和R4均各自独立地选自-H和C1-C10酰氧基；以及R5选自-H、C1-C10烷基、C2-C10烯基、C2-C10炔基、C3-C7环烷基、苯基、苯甲基和C3-C7环烯基，同时，最后提到的7个基团中的每一个都可用1到6个卤素原子的任意组合取代；R11、R12、R13、R21、R22、R2、R3和R4中至少有一个是-H，这些化合物被证实比其用作蛋白酶体抑制剂以减少肿瘤细胞生长的未被保护对应物更.....
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The present invention is wearable physical sign detector, physical sign telemetering and warning system and method. The system includes a physical sign detector, an analysis and judgment base stationand an emergency treatment device. The physical sign detector sends detected physical sign informatio.....
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Ultrasonic welding apparatus comprises a sensor ultrasonic welding apparatus and an ultrasonic transducer shaped piezoelectric material between the sensor output of at least two different welding parameters to measure, in order to select the output signal of the welding Parameters have a better sign.....
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一种将天然有机物质粉碎成纳米级纤维材料的方法，包括下列步骤：清洗掉天然有机物质原材料上的油脂并采用普通设备对其进行干燥处理；采用普通机械式粉碎机将所述制备的天然有机物质粗粉碎成小颗粒，该小颗粒的长度尺寸约为５００μｍ；将所述的粗颗粒和纯水混合成为悬浮液，并采用专业超声粉碎机对其进行精粉碎处理而成为微粒，该微粒的直径和长度尺寸均在２０μｍ以下；在高压下将所述含有微粒的悬浮液进料到纳米碰撞机中而将所述的悬浮液分成两部分，使它们相互碰撞并产生振动，进而导致所述的原材料成为纳米级尺寸；如果需要干燥纳米级有机物质纤维颗粒，则采用普通喷雾干燥器干燥所述的纳米颗粒。
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A use of radio frequency identification technology reference positioning system, comprising: a plurality of RFID reference tags, fixed to the coverage of the system within the fixture; plurality of RFID tag object, disposed on the object positioned want; plurality of mobile RFID reader, set on a mob.....
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