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Polycarbonate is commonly used in eye protection, as well as in other projectile-resistant viewing and lighting applications that would normally indicate the use of glass, but require much higher impact-resistance. Polycarbonate lenses also protect the eye from UV light.
A polycarbonate is an oxocarbon dianion consisting of a chain of carbonate units, where successive carbonyl groups are directly linked to each other by shared additional oxygen atoms. That is, they are the conjugate bases of polycarbonic acids , the conceptual anhydrides of carbonic acid , or polymers of carbon dioxide .
There is no standard quantitative definition of hygroscopicity, so generally the qualification of hygroscopic and non-hygroscopic is determined on a case-by-case basis. For example, pharmaceuticals that pick up more than 5% by mass, between 40 and 90% relative humidity at 25 °C, are described as hygroscopic, while materials that pick up less ...
About 29 of these elements are thought to play an active positive role in life and health in humans. [6] The relative amounts of each element vary by individual, mainly due to differences in the proportion of fat, muscle and bone in their body.
Surface anatomy, or superficial anatomy, is important in human anatomy being the study of anatomical landmarks that can be readily identified from the contours or other reference points on the surface of the body. [1] With knowledge of superficial anatomy, physicians gauge the position and anatomy of deeper structures.
Kelly Ripa is giving fans an update on her family's senior dog, Chewie.. After getting emotional during a recent episode of Live with Kelly and Mark over her 17-year-old dog's deteriorating health ...
The Trump administration ordered a critical agency that assists other government departments to cancel all of its media contracts amid outrage over federal tax dollars flowing to news outlets ...
Plastination is a technique or process used in anatomy to preserve bodies or body parts, first developed by Gunther von Hagens in 1977. [1] The water and fat are replaced by certain plastics , yielding specimens that can be touched, do not smell or decay , and even retain most properties of the original sample.