Secondary Waves Defined. Secondary waves, or S-waves, are seismic waves produced by an earthquake. As one side of a fault slips past the other, the pressure that had been stored is released and travels radially away from the focus of the earthquake.
Non-Absorbable sutures include :- Polypropylene sutures, Nylon (poylamide), Polyester, PVDF, silk and stainless steel sutures. Monofilament and Multifilament Sutures. Sutures can also be divided into two types on the basis of material structure i.e. monofilament sutures and multifilament or braided sutures. Braided sutures provide better knot security whereas monofilament sutures provide better passage through tissues.
Drawing of Monomer. The top drawing represents a small portion of the structure of isotactic polypropylene and the. syndiotactic structure. Polypropylene can also be produced in an atactic form using Kaminsky. catalysts, but such a form proves not very useful. Atactic polypropylene blocks are generally. joined with isotactic blocks to produce elastomeric polypropylene. Elastomeric polypropylene is. not commercially produced.