11. Recombinant DNA has been explored since the late 1980s to increase residence times . 12. Residence time of the boulders has been estimated as 500 years.13. The residence times of scavenged-type trace metals are around 100 to 1000 years. 14. Residence time plays an important role in environmental engineering and chemistry.15. The residence time distribution function is therefore a dirac delta function at \ tau. 16. The average residence time of the ore in the mill is 30 60 seconds. 17. Weak geothermal heating and long residence time create a very thick convective bottom layer. 18. The retort had a 15 ton capacity, and the residence time was 24 hours. 19. Hydrology, the study of water, discusses the water budget in terms of residence time . 20. The ideal reaction has an optimal temperature range between 630 and 720 residence times .
