(c) 2013 Elsevier Editora Ltda. All rights reserved.”
“Herbal medicine is becoming more and more popular and has been widely used in the world. However, the quality control is a major issue for different types of herbal products. In this study,
a combination of high performance liquid MK5108 purchase chromatography (HPLC) and gas chromatography (GC) analytical methods was successfully employed for the pharmaceutical analysis and quality control of herbal medicine. Five different brands of a popular Chinese herbal medicine “”Yin Qiao Jie Du”" tablets were chosen as the model products for the purpose of analysis and quality control. After optimization and validation, HPLC and GC methods were applied to quantify the contents of nonvolatile bioactive compounds glycyrrhizin, chlorogenic acid, and volatile ingredient menthol, respectively. The results revealed significant content variations of active ingredients among different brands of tablets. Glycyrrhizin ranges from 0 to 2.672 mg in one tablet, chlorogenic acid ranges from 0.416 to 2.453 mg, while menthol ranges from 0 to 0.1666 mg, indicating different quality of the same product
from various manufacturers. This study demonstrated that the combination of HPLC and GC methods can be used to quantify both the nonvolatile and volatile active ingredients in herbal medicines and thus control their quality.”
“The dynamics AZD1208 chemical structure of the magnetization selleck switching in magnetic tunnel junctions (MTJs) designed for spin-transfer-torque (STT) magnetoresistive random access memory (MRAM) was investigated using micromagnetic simulations. It was found that for short pulses (< similar to 10 ns), the switching current threshold does not correlate with the switching field threshold and it is, therefore, essentially insensitive to MTJ shape (aspect ratio) and edge roughness. However, if the magnetization reversal is thermally activated for longer pulses, the switching current and the switching field are directly correlated. For a relatively large MTJ, the
distribution is wide due to the excitation of high-order spin wave modes. (C) 2009 American Institute of Physics. [DOI: 10.1063/1.3059212]“
“Objective: To evaluate the cumulative incidence of dyslipidemia and fasting glucose impairment three years after initiating the first antiretroviral (ART) regimen and the association with the type of ART regimen in an AIDS outpatient clinic in Brazil.
Methods: Retrospective cohort of HIV-1 infected patients attending an outpatient HIV clinic in Vitoria, Brazil, between January/2010 and May/2011. Data, including blood pressure, dyslipidemia (high total cholesterol and low HDL-C), fasting glucose, and cardiovascular risk by Framingham Risk Score were abstracted from medical records from clinic visits six months prior and three years after starting ART.