1964 27 Nov. 1177/2 The extra influx of ionic calcium..was only ≦ 0.2 picomole/cm2 surface membrane.
1996 2 July ii. 6/2 When she was investigated, it was discovered that the level of oestradiol..was abnormally high: 1,700 (picomoles per litre) instead of the usual 500–700.