Coregistration of FDM data with MR imaging data used for stereotactic biopsy guidance enabled us to correlate these

results with histopathologic findings. Data were analyzed by using regression analyses and Hoetelling-Williams and Wilcoxon signed rank tests.

Results: Histopathologic correlation revealed strong negative correlations with both the logarithm of tumor cell number (CN) (R = -0.825) and the percentage of tumor infiltration (TI) (R = -0.909). Complete destruction of WM structures was found when the percentage of TI was 60% or greater and when the tumor CN was 150 or greater. We estimated a fi ber density value selleck inhibitor of 18 as a limit in the identification of fi ber structures that are infiltrated with tumor yet are still potentially functional.

Conclusion: FDM provides histologic insight into the structure of WM; therefore, it may help prevent posttreatment neurologic deficits when planning therapy of brain tumors. (C) RSNA, 2010″
“Genetic diversity of Stipa breviflora populations in the Inner Mongolian grasslands of China and its possible correlation with climatic factors was examined

using geographic information systems and random amplified polymorphism DNA analysis. A total of 308 bands were produced with 28 arbitrary decamer oligonucleotide. Three major findings were demonstrated. First, the genetic diversity of S. breviflora was high but lower than that of Stipa grandis and Stipa krylovii. Second, genetic distances between the populations analyzed using the unweighted pair group method and the Mantel test had a highly DAPT Proteases inhibitor positive correlation with geographical distances, indicating Z-VAD-FMK that spatial separation of this species in the studied area produced genetic shift in the population. Finally, both canonical correspondence and Pearson’s analyses revealed strong correlations between genetic differentiation and temperature in the

area. We therefore conclude that temperature variations play an important role in genetic differentiations among the investigated S. breviflora populations.”
“Synchrotron-based x-ray radiation has been utilized to measure time-resolved x-ray excited optical luminescence (TR-XEOL) from InGaN/GaN multiple quantum well (MQW) structures. Excess carrier recombination lifetimes were determined for MQWs grown on conventional c-plane as well as on non-polar m-plane substrates. In addition, the simultaneous measurement of XEOL and x-ray fluorescence reveals an interaction between inner-core excitations of Si impurities and bound exciton recombination in doped GaN-based device structures. Furthermore, the TR-XEOL characterization technique were also applied to InGaN/GaN MQWs grown on GaN inverted pyramid structures. (C) 2011 American Institute of Physics. [doi:10.1063/1.