Effect of Applied Voltage and Needle Size on Morphology of polyamide-6.6 Nanofiber Formed by Electro spinning Technique

Nylon-6/6 continuous Polymer nanofibers (NF) were produced by using conventional single needle electrosprinng (ES) technique. In this paper several parameters, such as applied voltage and needle diameter were investigated to optimize fiber morphology. The morphological and structure properties of the fiber (average diameter, height, length, surface roughness and fiber shape) are visualized by Atomic Force Microscopy (AFM). Good alignment of polymer nanofibres was confirmed by AFM and optical microscopy observations. We concluded that fiber diameter increases with decreasing applied voltage intensity and increasing the distance between the electrodes.

Thoracic Small Round Cell Tumors

There is a group of tumors share the same nuclear size <3 red blood cells and can be differentiated only by immunostaining. All thoracic small cells tumors diagnosed between 1998-2001 during 4 years, at AL ASSAD UNIVERSITY HOSPITAL – DAMASCUS UNIVERSITY. There were 103 cases (66 cases of small cell carcinoma, 30 malignant lymphoma, and 7 cases of PNET ). We performed the immunostaining in 31 cases of small cell carcinoma ,all of them were malignant lymphomas and the 7 cases of PNET*. PNET cannot be diagnosed without immunostaining. We must demand the immunostaining if there is a doubt ( clinical or pathological) about the real nature of a small cell tumor.