(Rosaceae), a new species from Yunnan, China.

A new species and its variant R.funingensisf.rosea, both collected from Yunnan Province, China, are, for the first time, documented and illustrated in this study.

Precise analysis of the effect of basal core promoter/precore mutations on the main phenotype of chronic hepatitis B in mouse models.

High replication and mutation rates of hepatitis B virus (HBV) often lead to reduced or suppressed hepatitis B e antigen expression. The most common mutations are genomic variations in the basal core promoter (BCP) and pre-core (PC) regions. However, the effect of BCP/PC mutations on HBV phenotype in vivo remains unclear.

Fast and fully automatic calibration of frequency offset for balanced steady-state free precession cardiovascular magnetic resonance at 3.0 Tesla.

Background: This study proposed a fast and fully automatic calibration system to suppress the dark banding artifacts in balanced steady-state free precession (bSSFP) cardiovascular magnetic resonance (CMR) at 3.0 T.

Methods: Twenty-one healthy volunteers (18 men, 3 women; mean age 24.

Optimization of PROPELLER reconstruction for free-breathing T1-weighted cardiac imaging.

Purpose: Clinical cardiac MR imaging techniques generally require patients to hold their breath during the scanning process to minimize respiratory motion-related artifacts. However, some patients cannot hold their breath because of illness or limited breath-hold capacity. This study aims to optimize the PROPELLER reconstruction for free-breathing myocardial T1-weighted imaging.

Accelerating image registration of MRI by GPU-based parallel computation.

Automatic image registration for MRI applications generally requires many iteration loops and is, therefore, a time-consuming task. This drawback prolongs data analysis and delays the workflow of clinical routines. Recent advances in the massively parallel computation of graphic processing units (GPUs) may be a solution to this problem.

Real-time feedback optimization of z-shim gradient for automatic compensation of susceptibility-induced signal loss in EPI.

Signal loss in gradient-echo echo planar imaging (GE-EPI) due to susceptibility-induced magnetic field inhomogeneity makes it difficult to assess the blood oxygenation level-dependent (BOLD) effect in fMRI investigations. The z-shim method that applies an additional gradient moment is one of the more popular methods of compensating for GE-EPI signal loss. However, this method requires a calibration sweep scan and post-processing to identify the optimal z-shim gradients, which slows down fMRI experiments.

Synthesis and antitumor activity of sulfur-containing 9-anilinoacridines.

A series of sulfur-containing 9-anilinoacridines related to amsacrine were synthesized and evaluated for their anticancer potential. Among the compounds, both diol-containing compounds, 2a and 3, were the most cytotoxic of the sulfide series against V-79 cells in vitro (IC(90) = 2.1 microM and 1.