Kroger , n . , r . deutzmann , and m . sumper . " polycationic peptides from diatom biosilica that direct silica nanosphere formation . " science 286 , ( 1999 ) : 1129 - 32 矽藻生物矽中左右矽奈米超微粒组成之聚阳离子型胜肽刊于《科学》 286 , ( 1999 ) : 1129 - 32
2.
Wal - mart sells approximately $ 110 billion per year in groceries making it the largest grocery seller too ? substantially bigger than the largest grocery chain , kroger , with $ 60 billion sales 沃尔玛食杂每年销售约1100亿美元，也是其最大的销售类别?远超过最大杂货连锁店克罗格的600亿美元。
