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******************************** Nanotechnology and stent ********************************
Obstructive coronary artery diseases (CAD), atherosclerosis and heart stroke, are the main causes of death in the United States. Atherosclerosis resulted from the narrowing of the arteries due to the accumulation of calcium and fats that lead to plaque formation (Badimon and Vilahur, 2014). Most common invasive treatment option CAD is the percutaneous coronary intervention (PCI), Starting from balloon angioplasty to advanced stages of stents. Balloon angioplasty applied to widen the wall of the coronary artery and restore blood flow, however, coronary arteries may get narrowed again (restenosis) because no support is left.
******************************** A literature review ********************************
Spermatogenesis is an extended, complex, cyclical process that is highly organized and coordinated (Nayak et al., 2016). It begins with the proliferation of diploid spermatogonia and proceeds through the extensive morphological changes that are leading to the formation of a haploid mature functional spermatozoon (Nóbrega et al., 2009; Nóbrega et al., 2010; Lacerda et al., 2014).