By Randy Shilts
Upon it's first e-book 20 years in the past, And The Band Played on used to be speedy famous as a masterpiece of investigatve reporting. a world bestseller, a nominee for the nationwide e-book Critics Circle Award, and made right into a severely acclaimed motion picture, Shilts' divulge published why AIDS was once allowed to unfold unchecked through the early 80's whereas the main relied on associations overlooked or denied the threat. One of the few true glossy classics, it replaced and framed how AIDS was once mentioned within the following years. Now republished in a different twentieth Anniversary version, And the Band performed On is still one of many crucial books of our time.
Read Online or Download And the Band Played On: Politics, People, and the AIDS Epidemic (20th Anniversary Edition) PDF
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Extra info for And the Band Played On: Politics, People, and the AIDS Epidemic (20th Anniversary Edition)
There is a structureless outer layer of enamel about 30 μm thick found most commonly toward the cervical area and less often on cusp tips. There are no prism outlines visible, and all the apatite crystals are parallel to one another and perpendicular to the striae of Retzius. This layer seems to be more heavily mineralized. Microscopically, the enamel surface initially has circular depressions indicating where the enamel rods end. These concavities vary in depth and shape, and they may contribute to the adherence of plaque material, with a resultant caries attack, especially in young individuals.
After the primary dentin is formed, dentin deposition continues at a reduced rate even without obvious T I P F I G U R E 2 - 1 5 Ground dentinal surface, acidetched for 5 seconds with 37% phosphoric acid. The artiﬁcial crack shows part of the dentinal tubules (T). The tubule apertures are opened and widened by acid application. 2 mm from pulp. Peritubular dentin (P) is more mineralized than intertubular dentin (I). ) 26 CHAPTER 2 Clinical Signiﬁcance of Dental Anatomy, Histology, Physiology, and Occlusion A B C D FIGURE 2-17 Tubules in superﬁcial dentin close to the DEJ (A) are smaller and more sparsely distributed compared with deep dentin (B).
The crystallites are tightly packed in a distinct pattern of orientation that gives strength and structural identity to the enamel prisms. The long axis of the apatite crystallites within the central region of the head (body) is aligned almost parallel to the rod long axis, and the crystallites incline with increasing angles (65 degrees) to the prism axis in the tail region. The susceptibility of these crystallites to acid, from either FIGURE 2-6 Electron micrograph (approximately ؋350,000) of mature, hexagon-shaped enamel crystallites (arrows).
And the Band Played On: Politics, People, and the AIDS Epidemic (20th Anniversary Edition) by Randy Shilts