Light scattering and in vitro biocompatibility studies of poly (vinyl pyrrolidone) derivatives with amino-acid-dependent groups.

Two poly (vinyl pyrrolidone) (PVP) families with amino-acid residues (glycine, beta-alanine, gamma-aminobutiric acid and epsilon-aminocaproic acid) on the base of the co-polymer N-vinyl pyrrolidone and allyl-glycidyl ether (VP-AGE) and on the base of epoxidized PVP (EPVP) were synthesized. Static and dynamic light scattering measurements of these PVP derivatives in water showed that their structure/ behavior were similar to that of PVP. The bioreactivity was also similar to that of PVP.

[Method for gastric resection with end-to-end gastroduodenal anastomosis].

The authors suggest a method of stomach resection in which the gastroduodenal anastomosis is created by applying sutures to the layers after separating the sheaths of the organs into layers. The inner sheaths (muco-submucous) of the organs are butt joined after their excision almost at the base, while the outer sheaths (seromuscular) are sutured with rarely placed crimping sutures. The rare placing of the sutures and moderately tight tying of the ligatures prevent impairment of tissue nutrition, whereas crimping of the outer sheath provides wide contact of the serosa.