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Developments in ophthalmic microsurgical techniques now permit Nike Jordan Canada Toronto the sampling of tissues within the vitreous cavity of non-excised eyes. In contrast to Nike Jordan Release Dates 2013 studies of excised eyes, evaluation of these new ‘vitreous biopsies’ can often provide information about early vitreous pathobiology. Vitreous biopsies may be obtained out of eyes with disorders ranging from degeneration to neoplastic infiltration of the vitreous and this review aims to examine some of the histological features of these specimens. As vitreous surgery continues to evolve, it is anticipated that further challenges will arise for the pathologist.
Converging lines of evidence suggest that a significant portion of the Martian surface Air Jordan 12 Retro fines may consist of salts and smectite clays. Salts can form stoichiometric hydrates as well as eutectic solutions with depressed freezing points; clays contain bound water of constitution and adsorb significant quantities of water from the vapor phase. The formation of ice may be suppressed by these minerals in some regions on Mars, and their presence in abundance would imply important consequences for atmospheric and geologic processes and the prospects for exobiology.