(C) 2012 Wiley Periodicals, Inc.”
“This study presents a novel green method using starch for the synthesis of silver nanoparticles (AgNPs). In this method, the SRT1720 solubility dmso fungal supernatant was added to a mixture of starch and silver nitrate solutions. The characteristics of AgNPs synthesized by three independent processes a modified polysaccharide method, a microbial method, and our novel method were compared. Dynamic light scattering (DLS) analysis
revealed that the average sizes of AgNPs synthesized by the microbial method, the modified polysaccharide method, and our novel method were 84, 20, and 15 nm, respectively. The most stable AgNPs were generated by our novel method. The X-ray diffraction (XRD) spectrum of the products from the novel method showed that these AgNPs have high crystallinity. Fourier-transform infrared spectroscopy (FTIR) spectra demonstrated that the functional groups present in the products
prepared by the novel method are a combination of the functional groups present in the AgNPs synthesized by the other two methods. (C) 2012 Elsevier Ltd. All rights reserved.”
“COZA, A., B. M. NIGG, and J. F. DUNN. Effects of Vibrations Apoptosis inhibitor on Gastrocnemius Medialis Tissue Oxygenation. Med. Sci. Sports Exerc., Vol. 43, No. 3, pp. 509-515, 2011. Purpose: Whole-body vibrations are known to affect muscle activity and tissue oxygenation, but some energetic aspects are still poorly understood. This study investigates the effects of whole-body vibration on gastrocnemius muscle oxygen utilization rate and tissue oxygenation dynamics during exercise. Methods: The effects of vibration on gastrocnemius medialis muscle oxygenation were investigated during a dynamic exercise on a sample of 16 active male subjects (age = 26.3 +/- 5.1 yr, mass = 71.2 +/- 4.8 kg (mean +/- SD)). Both arterially occluded (AO) selleck chemicals llc and nonoccluded (N/O) conditions were investigated. Tissue oxygenation was monitored with a near-infrared spectrometer. Oxygen
utilization rate and tissue oxygenation recovery were computed as the slopes of the regression line of the oxygenation decay and recovery, respectively. A fast Fourier transform (FFT) was used to determine the frequency spectrum of the oxygen saturation data. EMG activity was monitored using bipolar EMG electrodes. A windowed root mean square analysis was used to monitor the amplitude of the EMG signal. Results: A statistically significant increase of 15% (P < 0.05) in oxygen utilization rate was found for the vibration condition in the AO leg but not in the N/O leg. The oxygenation recovery rate for the vibration condition was 34% higher (P < 0.05) than that for the control condition. A low-frequency periodic oscillation (T approximate to 10 s) in the tissue oxygenation data was determined from the FFT spectrum. A statistically significant decrease in the oscillation frequency was noticed for the vibration condition compared with the control.