Renal Replacement Therapy (RRT) Overview. Overview of RRT. Renal replacement therapy (RRT) is required when the kidneys are functioning at less than 10â15 percent. Dialysis. People with advanced chronic renal failure (CRF), kidney failure, who have progressed to end-stage renal disease (ESRD) usually require dialysis.
Rods are maximally sensitive to wavelengths near 500 nm, and play little, if any, role in colour vision. In brighter light, such as daylight, vision is photopic: light is detected by cone cells which are responsible for colour vision.
Â· Though both firs and pines are conifers, there are differences between the two varieties of conifers that are easy to detect. Â· The one major difference between firs and pines pertains to needles in their cones. While needles are in groups of 2-6 in case of pines, needles are single in case of firs. Â· Cones of firs are bluish green, while those of pine are brown and black. Â· Fir trees are pointed as they grow upwards.