From DNA Replication at ThinkQuest. In general, DNA is replicated by uncoiling of the helix, strand separation by breaking of the hydrogen bonds between the complementary strands, and synthesis of two new strands by complementary base pairing. Replication begins at a specific site in the DNA called the origin of replication.
For Meniereâs disease, destructive procedures are associated with better control of vertigo than shunt surgery, showing good control in over 90% of patients followed for five or more years. The vestibular nerve may be sectioned via the middle fossa, retrolabyrinthine, and retrosigmoid approaches, with similar efficacy.
The problem usually stems from tiny particles that get stuck in a sensitive area of the inner ear thatâs responsible for maintaining balance. Many sufferers get immediate relief from a series of repositioning movements, called the Epley maneuver, that can dislodge the particles. You can learn the exercises in a doctorâs office or on your own on the American Academy of Family Physician's web site (search for âEpley maneuverâ). If your vertigo has lasted longer than a week, ask your doctor about other possible causes, including multiple sclerosis, stroke, or more rarely, a brain tumor.