头部直径 meaning in English

kopfdurchmesser minor diameter
matrix head diameter

Under trasmission electronic microscope ( tem ) , the cyanophage showed a bacteria - phage shape with head diameter at 52nm and short tail ( almost invisible )
电镜照片显示该噬藻体为噬菌体形态，头部直径为52nm ，尾部很短，几乎不可见。
Furthermore , the sequences were analyzed and compared with the sequence data in genbank . the results indicated that the cyanophage represented a phage - like shape with head diameter ca . 47 - 52nm and a short tail almost invisible
研究结果表明：此病毒在负染电镜下为噬菌体形态，头部直径约47 - 52nm ，尾部几乎不可见。