Diagnostic medical sonography (DMS) uses. high frequency sound waves to produce images. (sonograms) of structures such as the liver, heart. or unborn baby that can be visualized on a video. monitor. Sonography is often referred to as. âultrasoundâ or âultrasonographyâ. Sonography. can be used to examine many parts of the body. including organs in the abdomen, the breast, the. uterus and ovaries, the prostate gland, the heart. and blood vessels.
principle of superposition - the displacement of any point due to the superposition of wave systems is equal to the sum of the displacements of the individual waves at that point; the principle of superposition is the basis of the wave theory of light. Huygens' principle of superposition.
This super coiling accommodates the stress energy and the DNA becomes stable with 10.6 bp per coil. Generally the density of the super coils a DNA is one super coil per 200bp or per ~20 turns of the helix. Negative super coils help in stabilizing certain DNA structures i.e. Z-DNA, cruciform DNA, triplex DNA. It also helps in unwinding of the DNA during replication as replication bubble or during transcriptional initiation as transcriptional bubble.