4 and 0.5, regardless of the cooling rate and the recycling steps. Each of those samples presents different etc average spherulite radii, which can influence the opacity. Thus the opacity is reported in Figure 9 versus the average radius of the spherulites measured on each sample. It can be noticed that opacity, for the same crystalline content, tends to increase on increasing the radius of the spherulites.Figure 9Dependence of the opacity of the films versus the radius of the spherulites for samples presenting an �� phase content between 0.4 and 0.5.4. ConclusionsIn this work, the influence of recycling steps on the opacity of films of a commercial grade of isotactic polypropylene was studied. The material was extruded several times to mimic the effect of recycling procedures.

After extrusion, films were obtained by cooling samples of material at different cooling rates, taking care of the fact that all the samples present the same surface finish. The opacity of the obtained films was then measured and related to their crystallinity and morphology. It was found that opacity generally increases on increasing the amount of �� phase; however, the effect depends also (in a nonmonotonous way) on the steps of recycling, mainly because the samples underwent different recycling steps, even when they present the same crystallinity degree, and the same amount of �� phase can have spherulites of different average sizes. It was shown that, for the same amount of �� phase, opacity generally increases on increasing the size of the spherulites.

Conflict of InterestsThe authors declare that there is no conflict of interests regarding the publication of this paper.AcknowledgmentsThe authors wish to thank Annarita Cascone and Claudia Cirillo for carrying out part of the experiments during their thesis in chemical engineering at University of Salerno.
Mitochondria are key molecular players in all cells performing many vital functions. They are the powerhouse of the cell, providing the cell with adenosine triphosphate (ATP) generated by oxidative phosphorylation (OXPHOS). Mitochondria have an important role in buffering calcium flux from the endoplasmic reticulum and the plasma membrane thus helping to maintain the spatiotemporal distribution of calcium in the cell.

Mitochondria have enzymes essential for steroid synthesis and are the chief source of endogenous reactive oxygen species (ROS) which are produced by several mitochondrial enzymes including components of the OXPHOS system [1].Proper mitochondrial functioning is very important to neurons. Neurons have high energy requirements. They are terminally differentiated Cilengitide cells which consume a lot of ATP to maintain ion gradients across membranes for proper neurotransmission. Efficient mitochondrial transport and positioning are also critical because different regions of the neuron have different energy requirements.