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dentistry Reference library
The Oxford Companion to the Body
...is the art or science of treating diseases of the teeth and of the gums around them. As with medicine, dentistry is subdivided into a number of specialities. Oral surgery includes tooth extractions and operations on the jaw bones and the soft tissues of the mouth. Oral medicine deals with the treatment of local or systemic diseases affecting the mouth. Restorative dentistry involves replacement of parts of teeth or missing teeth. Fillings may be made from ‘plastic’ materials, such as amalgams or tooth-coloured composite resins, or pre-cast inlays;...
Biogeography Reference library
Encyclopedia of Evolution
...as the passenger pigeon became a “pestilence” in accounts from the eighteenth and nineteenth centuries. Prehistoric burning by Native Americans was likely pervasive and created a more open continent and a mosaic of habitats. Such examples are increasingly common and show the systemic effects of human participation in ecosystems regardless of whether ancient humans saw themselves as ecologically noble, had certain conservation practices, or considered the natural world sacred. By the times of the Babylonians, Greeks, and Romans, the habitats of Southwest Asia...
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