Journal of Human Hypertension (2010) 24, 183-189; doi:10.1038/jhh.2009.50; published online 11 June 2009″
“Novel hydrogels of interpenetrating polymer networks (IPNs) composed of polyacrylamide and poly(gamma-glutamic acid) were synthesized. In these systems, both polymers were crosslinked independently; this reduced the potential loss of a polymer during the washing process, as often occurs in semi-IPN systems. Interpolymer interactions were investigated with Fourier transform infrared
spectroscopy and differential scanning calorimetry. These studies suggested possible interactions between both polymers G418 inhibitor by the formation of hydrogen bonds. The swelling behavior of these hydrogels was analyzed by immersion of the hydrogel samples in deionized water at 25 and selleck kinase inhibitor 37 degrees C and in buffer solutions with pHs of 3, 7, and 10. The kinetics of swelling showed increases in the values of the swelling ratio with increasing immersion time in the swelling medium, molar proportion of the biopolymer in the hydrogel, temperature, and pH of the swelling medium. All of the hydrogels swelled rapidly and reached
equilibrium in an average time of 40 min. (C) 2010 Wiley Periodicals, Inc. J Appl Polym Sci 119: 3531-3537, 2011″
“Composites based on carbon nanostructures (CNS) and poly(epsilon-caprolactone) (PCL) were produced by solvent casting technique. Single-walled carbon nanotubes (SWCNTs) and carbon nanofibers (CNFs) were selected, to produce composite films with enhanced properties. The role of CNS type and percentage were investigated in terms of morphological, thermal, mechanical, and dielectrical properties. Composite morphological analysis reveals a good dispersion of CNS, at low and high content. Thermal properties
underline the nucleation effect of CNS on PCL polymer ACY-738 matrix. Reinforcing effects in terms of increased tensile modulus were obtained with both nanofillers, but a higher reduction of the ductility was shown in PCL/CNF materials. A higher efficiency to form a conductive network, assessed by AC conductivity, was observed for SWCNTs at concentration lower than 1 wt. % (C) 2010 Wiley Periodicals, Inc. J Appl Polym Sci 119: 3544-3552, 2011″
“Arterial stiffness is an established cardiovascular risk factor influencing haemodynamic properties in the microcirculation. We tested the hypothesis that increased arterial stiffness is associated with an increase in cerebrovascular resistance in the elderly. Brachial ankle pulse wave velocity (baPWV), using arterial tonometry, and anterior cerebral blood flow (aCBF), using extracranial ultrasound, were measured in 26 participants (67-92 years). Non-parametric statistics examined relationships between age, blood pressure, baPWV, cerebrovascular resistance (CVRi) and aCBF. Bivariate analysis suggested that baPWV was the only vascular characteristic associated with CVRi (r(s) = 0.59; P = 0.002).