What You May See and Hear During Echocardiography. As the doctor or sonographer moves the transducer around, different views of your heart can be seen on the screen of the echo machine. The structures of the heart will appear as white objects, while any fluid or blood will appear black on the screen.
Ostracoderms (shell-skinned) refers to the armored jawless fishes of the Paleozoic. The term does not often appear in classifications today because it is paraphyletic or polyphyletic, and has no phylogenetic meaning.he microscopic layers of that shield appear to evolutionary biologists, like they are composed of little tooth-like structures.. Neil Shubin writes: Cut the bone of the [ostracoderm] skull openâ¦pop it under a microscope andâ¦you find virtually the same structure as in our teeth.
RETROVIR is the brand name for zidovudine (formerly called azidothymidine ), a pyrimidine nucleoside analogue active against HIV-1. The chemical name of zidovudine is 3âazido-3â-deoxythymidine; it has the following structural formula: