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.
Pollen cones are much smaller than their woody seed cone counterparts; they are usually produced in clusters at the tips of the lower branches of a tree. Mount a small amount of conifer pollen in a drop of water on a slide, and examine it with the aid of your compound microscope.. Understand the differences between male (pollen) and female (seed) pine cones. 4. Know the locations and functions of a pine micropyle, integument, pollen chamber, and nucellus. 5. Know the function of the bladders or wings on pine pollen grains.