Aging and memory effects are further unique fingerprints of a spin-glass freezing on the surface of isolated magnetic nanoparticles. (C) 2011 American Institute of Physics. [doi:10.1063/1.3527932]“
“A series of copolyimide/SiO2 hollow sphere thin films were prepared successfully
based on bis[3,5-dimethyl-4-(4-aminophenoxy)phenyl]methane and 9,9-bis(4-(4aminophenoxy)phenyl)fluorene (molar ratio = 3 : 1) as,diamine, and 4,4′-(4,4′-isopropylidenediphenoxy)bis(phthalic anhydride) as dianhydride, with different wt % SiO2 hollow sphere powder with particle size 500 nm. Some films possessed excellent dielectric properties, with ultralow dielectric constants of 1.8 at 1 MHz. The structures and properties of the SN-38 thin films were measured with Fourier transform infrared spectra, scanning electron microscope, thermogravimetric analysis, and dynamic mechanical thermal analysis. The polyimide (PI) films exhibited glass-transition temperatures in the range of 209- 273 degrees C and possessed initial thermal decomposition temperature reaching up to 413-477 degrees C in air and 418-472 degrees C in nitrogen. Meanwhile, the composite films were also exhibited good mechanical properties. (C) 2010 Wiley Periodicals, Inc. J Appl Polym Sci 120:
Alvocidib 1133-1137, 2011″
“Purpose: To examine the benefits of using near-isotropic single-slab three-dimensional (3D) magnetic resonance (MR) imaging for the creation of subtraction images and to evaluate their performance in the detection of active multiple sclerosis (MS) brain lesions in comparison with two-dimensional (2D) subtraction images.
Materials and Methods: Fer-1 nmr The study protocol
was approved by the local ethics review board and all subjects gave written informed consent before investigation. Three-dimensional MR sequences, including double inversion-recovery, fluid-attenuated inversion recovery, T2-weighted, and T1-weighted magnetization-prepared rapid acquisition gradient-echo (MP-RAGE), and corresponding 2D sequences were performed twice in 14 patients (eight women, six men; mean age, 37.6 years) with MS and nine age-matched healthy control subjects (three women, six men; mean age, 31.7 years). Active lesions were scored by two independent raters, followed by a consensus reading. Lesion counts were evaluated by using negative binomial regression; interrater agreement was evaluated by using intraclass correlation coefficient.
Results: Three-dimensional subtraction images had less residual misregistration and flow artifacts and depicted higher numbers of active lesions with greater interobserver agreement compared with 2D subtraction images. Among the 3D sequences, MP-RAGE subtraction imaging enabled detection of a significantly higher mean number of positive active MS lesions compared with 2D subtraction imaging (2.8 versus 1.7, P = .012), particularly infratentorial lesions (0.6 vs 0.1, P < .