a fourth-generation ziegler-natta catalyst was prepared to synthesize polypropylene (pp), which was stabilized by in situ polymerization employing lignin as antioxidant. the antioxidant properties of lignin were compared with those of the commercial antioxidant irganox 1010. the presence of lignin in the reaction medium slightly decreased the catalytic activity of the reaction. the isotacticity...

The widely used textbook by Brassard and Bratley [4] includes a chapter devoted to asymptotic notation (Chapter 3, pp. 79–97). We have attempted to test how suitable the current version of Mizar is for recording this type of material in its entirety. This article is a follow-up to [13] in which we introduced the basic notions and general theory. This article presents a Mizar formalization of ex...

Cryptosporidiosis is classified by the Centers for Disease Control and Prevention as an emerging infectious pathogen (Guerrant, 1997). Initially, Cryptosporidium parvum was believed to be only an occupational hazard of people exposed to infected animals, but it is now known to cause illness or disease both in immune competent and immune compromised people. Cryptosporidiosisis one of the most co...

1. Thompson JN, Gibson B, Kohut RI: Airway obstruction in LeFort fractures. Laryngoscope 1997; 97:275-9 2. Gotta AW: MaXilhfacial trauma, Textbook of Trauma Anesthesia and Critical <:are. Edited by Christopher M. Grande. Missouri, Mosby Year-Book Inc., 1993, pp 529-39 3 . Schultz KC: Nasotracheal intubation in the presence of Eicial fractures. Plast Reconstr Surg 1990; 86: I046 4. Gordon NC, To...