When the SAN concentration was 70 wt% or higher, the electrical resistivity was very high because MWCNTs were confined in the isolated PC particles. In addition, SAN was replaced by other polymers [polystyrene, methyl methacrylate/styrene, and poly(methyl methacrylate)]; these yielded similar blend morphologies and MWCNT localization and showed the generality of the concept of effective concentration in explaining a decrease in the electrical resistivity upon the addition of a second selleck products polymer. (C) 2011 Wiley Periodicals, Inc. J Appl Polym Sci 120: 3224-3232, 2011″
“Hypertension (HTN) is a risk factor for erectile
dysfunction, but its effect on vas deferens (VD) contractility and the ejaculatory response has not been delineated. NG-nitro-L-arginine methyl ester (L-NAME), a nitric oxide synthase inhibitor, was used for induction of nitric oxide (NO)-deficient HTN. Our aim was to evaluate the effects of L-NAME-induced HTN on rat VD contractility and to determine whether sildenafil affects
VD contractility. A total of 36 male rats were divided into (1) control, (2) L-NAME-HTN, (3) sildenafil treated L-NAME-HTN groups. Raf inhibitor Group 2 was treated with L-NAME (40 mg kg(-1) per day) in drinking water for 4 weeks. Group 3 received sildenafil (1.5 mg kg(-1) per day, by oral gavage) concomitantly with L-NAME. The prostatic portion of the VD was subjected to electrical field stimulation (EFS, 1-20 Hz), and the P2X(1) agonist alpha,beta-methylene ATP (alpha,beta-meATP, 100 mu mol L(-1)-1 mu mol L(-1)) and the alpha 1-adrenoceptor agonist phenylephrine (Phe, 100 mu mol L(-1)-1 mmol L(-1)) were used to construct concentration-response curves. These experiments were repeated in the presence of P2X receptor antagonist, pyridoxalphosphate-6-azophenyl-2′,4′-disulfonic acid (PPADS, 30 mu mol L(-1)). VD contractions in response to EFS, alpha,beta-meATP and Phe were significantly enhanced
by L-NAME. Sildenafil SB203580 MAPK inhibitor treatment in the L-NAME group improved the contractile response of VD to EFS (20 Hz). In the presence of PPADS, the enhanced contractile response of VD to EFS and alpha,beta-meATP in hypertensive rats was reversed. In the rat model of chronic NO depletion, the purinergic and adrenergic components and EFS affect VD contractility. The VD contractile response may be mediated more by the purinergic system than the adrenergic system, and sildenafil may alter the ejaculatory response in men with PE.”
“Study Design. Prospective randomized controlled animal model.
Objective. The purpose of this study is to determine whether the readministration of human recombinant bone morphogenetic protein-2 (rhBMP-2) induces an immune response and inhibits successful fusion in repeat posterolateral spinal surgery.
Summary of Background Data. Little research has been performed on the effectiveness or immunoreactivity of rhBMP-2 (Infuse, Medtronic, Memphis, TN) in the context of its reuse in posterolateral fusion spinal surgery at adjacent levels.
Methods.
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