The follicular phase begins with an increase in follicle-stimulation hormone (FSH), which causes increases in luteinizing hormone (LH) and gonadotropin-releasing hormone (GnRH). Concurrent increases in estrogen levels cause increases in progesterone, stimulating proliferation of the endometrium.
Examples of insulators include plastics, Styrofoam, paper, rubber, glass and dry air. The division of materials into the categories of conductors and insulators is a somewhat artificial division. It is more appropriate to think of materials as being placed somewhere along a continuum.
Aramid Paper. Introduction. NomexÂ® paper is a product manufactured by DuPont. NomexÂ® is a synthetic aromatic polyamide polymer that provides high levels of electrical, chemical and mechanical integrity when converted to paper and subsequent specialized parts.