We extend the notion of Novikov-Shubin invariant for free Γ-CW complexes of finite type to spaces with arbitrary Γ-actions and prove some statements about their positivity. In particular we apply this to classifying spaces of discrete groups.

A vector asymmetrical Nizhnik–Novikov–Veselov (NNV) equation is proposed based on its bilinear form. Soliton solutions expressed by Pfaffians are obtained. Bilinear Bäcklund transformation and the corresponding Lax pair for the vector ANNV equation are derived. © 2008 Elsevier Inc. All rights reserved.

In this paper, we derive exact traveling wave solutions of the (2+1)-dimensional Nizhnik-NovikovVeselov (NNV) system by a presented method. The method appears to be efficient in seeking exact solutions of nonlinear equations. Key–Words: (G ′ G )-expansion method, Travelling wave solutions, (2+1)-dimensional Nizhnik-Novikov-Veselov (NNV) system, nonlinear equation, exact solution, evolution equa...

Factors other than antimicrobial activity of soaps and antiseptic agents used for hand hygiene by health personnel play a role in compliance with recommendations. Hand hygiene products differ considerably in acceptance by hospital personnel. If switching from a nonmedicated soap to an antiseptic agent or increased use of an existing antiseptic agent for hand hygiene prevented a few more infecti...

This study aimed to evaluate the survival rate of microorganisms within different antiseptic formulations - povidone-iodine (PVP-I) and chlorhexidine (CHX) - after intentional contamination, and to establish the minimum care necessary to ensure sterilization of non-disposable antiseptic solution containers. A laboratory study was performed with 180 antiseptic containers, which were contaminated...

SUMMARY At present research, the antibacterial potency of 4 antiseptic agents formulated in mouthwash products against four gram-positive cocci and 2 gram-negative bacilli isolated from dental plaque and abscess evaluated by five specific in-vitro methods. The bacteriostatic effect of four antiseptic agents is as following relation:CHG > > CPO> CPC > PVP-I. But, The quality and quantity of ba...

In late 2013, the US Food and Drug Administration (FDA) issued a warning about the possibility of bacterial contamination of antiseptic solutions (1). Many infections caused by contaminated antiseptic solutions have been reported (1). The consequences ranged from localised infection at an injection site, to deep infections and even fatal septicaemia. The FDA analysed a series of reports includi...