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Tree remains that have undergone petrifaction, as seen in Petrified Forest National Park. In geology, petrifaction or petrification (from Ancient Greek πέτρα (pétra) 'rock, stone') is the process by which organic material becomes a fossil through the replacement of the original material and the filling of the original pore spaces with minerals.
A dermoid cyst is a mature cystic teratoma containing hair (sometimes very abundant) and other structures characteristic of normal skin and other tissues derived from the ectoderm. The term is most often applied to teratoma on the skull sutures and in the ovaries of females.
This condition can cause teeth to be discolored (most often a blue-gray or yellow-brown color) and translucent, giving teeth an opalescent sheen. [ 2 ] [ 3 ] [ 8 ] [ 5 ] [ 9 ] Teeth are also weaker than normal, making them prone to rapid wear, breakage, and loss.
A common dye found in snack foods can turn skin invisible so that we can see the organs inside, scientists say. Researchers found that applying the dye to skin allowed them to see the blood ...
If you’re unfamiliar with the cosmetic dental service, veneers are thin shells made of porcelain, resin, or composite materials that are custom-made and bonded to the front surface of teeth to ...
Many Recent shells, when the animal is alive or the shell is freshly empty, have an uppermost shell layer of horny, smooth, or hairy epidermis or periostracum, a proteinaceous layer which sometimes is thick enough to hide the color markings of the surface of the shell. The periostracum, as well as the coloration, is only rarely preserved in ...
Just when you thought you'd differentiated the sombré from the balayage, a new hair trend has made it's way onto the scene. It's called Ecaille, or tortoise shell in French. The technique ...
The skin may develop grey or brown patches which fade with time. Other symptoms can include hair loss, dental abnormalities, eye abnormalities that can lead to vision loss and lined or pitted fingernails and toenails. Associated problems can include delayed development, intellectual disability, seizures and other neurological problems.