The synthetic bacteria have 14 " watermark sequences " attached to their genome inert stretches of dna added to distinguish them from their natural counterparts .
I think a good watermark background should be between 10 % - 15 % opaque .
我认为一个好的水印背景的透明度应该在10%-15%之间。
If the background is light then the watermark should obviously also be fairly light and vice versa .
如果背景是淡色的,那么水印当然也要是适度的淡色,反之亦然。
Because of the difficulty of getting an application through icann 's process , a personalized domain ending will be an authenticity watermark of sorts .
Others guard against the small number of counterfeit zimbabwean bills rumored to be in the market by studying the watermark , signature and serial numbers that distinguish genuine bills .