This is mostly caused by tires that are overinflated. When a tire is overinflated, the tire, in essence, bulges out more in the center. The tire then rides mostly on that bulge and that bulge wears faster than the sides of the tire. Keeping your tires properly inflated can help you to avoid center wear.
Lysozyme is abundant in a number of secretions, such as tears, saliva, human milk, and mucus. It is also present in cytoplasmic granules of the macrophages and the polymorphonuclear neutrophils (PMNs). Large amounts of lysozyme can be found in egg white.
7 a and b, lysozyme is clearly evident in some pores within the microsphere bulk. Again, it is present as dense cluster of protein in the smaller pore features and it appears to cover the surface interface with the PLGA in some of the larger pores.