streak buffer/buffer streak

English to Russian Science Biology (-tech,-chem,micro-)

Fig. 4 illustrates effect of urine stable buffer (USB) on cell free DNA yield from urine.
The urine samples were kept at room temperature for 14 days after mixing with USB buffer or another commercial buffer streak.
After 14 days, the release of genomic DNA from no buffer samples yielded much higher DNA.
But USB or streak buffer prevented the release of cell DNA.