negative contrast meaning in Chinese

负对比
负反差

So called positive contrasts even if be pattern plate with purpose extract , negative contrasts is with empty carrier ( carry la ban ) for pattern plate
所谓的阳性对照就是以目的片段为模板，阴性对照是以空载体（挑蓝斑）为模板。
Results the quality of capf conforms to the requests of china pharmacopoeia and capf can promote the healing of oral ulceration and increase the healing number of ulcer rat , and shows remarkable difference with negative contrasting group
结果制备的复方芦荟多糖膜剂符合《中国药典》（ 2005年版）对膜剂的质量要求，同时复方芦荟多糖膜剂可促进口腔溃疡的愈合及增加给药6天后溃疡愈合的大鼠只数，与非治疗阴性对照组存在着显著性差异( p < 0 . 01 ) 。