Experimental evidence suggests that the nucleoid is largely composed of DNA, about 60%, with a small amount of RNA and protein. The latter two constituents are likely to be mainly messenger RNA and the transcription factor proteins found regulating the bacterial genome.
An ophthalmologist is a medical doctor (MD) or an osteopathic doctor (DO) who specializes in eye and vision care. Ophthalmologists are trained to perform eye exams, diagnose and treat disease, prescribe medications and perform eye surgery. They also write prescriptions for eyeglasses and contact lenses.
A doctor of osteopathic medicine (DO) may specialize in pediatrics or surgery. A DO may practice any field of medicine, including pediatrics. A DO may evaluate a patient's stress level and determine what effect it is having on that person's health. A doctor of osteopathic medicine may sometimes practice manipulation of the spine, which is similar to work done by chiropractors. A DO usually uses a holistic approach to treating patients. Doctors of osteopathic medicine tend to spend more time with patients.