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Recovery Method (recovery + method)
Selected AbstractsExtraction of propionic acid from model solutions: Effect of pH, salts, substrate, and temperatureAICHE JOURNAL, Issue 7 2009Amit Keshav Abstract Propionic acid can be successfully produced from fermentation broth once an efficient recovery method is available for the produced acid. Reactive extraction in this regard is a promising recovery method. pH, salt, substrate, and temperature studies are crucial in the extraction of propionic acid, because these parameters varied in actual fermentation broth. With this regard, effects of these were studied. Extraction from model solutions and salt or substrate containing systems is lower than what was obtained from normal aqueous solutions. Reason of this is the varying degree of hindrances of the salts on extraction of the acid. pH has very large effect on extraction efficiency of the extracting system. At pH > pKa of acid, very low extraction was obtained. Temperature was found to have no effect on the extraction from model solutions used. © 2009 American Institute of Chemical Engineers AIChE J, 2009 [source] Prevalence of Campylobacter spp. in a subset of intensive poultry flocks in IrelandLETTERS IN APPLIED MICROBIOLOGY, Issue 3 2009A. Patriarchi Abstract Aim:, The aim of this study was to investigate the prevalence of Campylobacter species in a subset of intensive poultry flocks by examining samples collected in geographically disparate areas on the island of Ireland. Methods and Results:, Faecal, water and environmental samples were collected from the interior of poultry houses on nine farms. Three cultural methods were used for Campylobacter isolation: direct plating, enrichment culture and a recovery method for emerging Campylobacter spp. Presumptive Campylobacter isolates were confirmed using biochemical tests and further identified to species level by multiplex PCR. All flocks sampled in this study were found to be contaminated with Campylobacter at the time of sampling. Structural and air samples taken from the interior of broiler houses were also found to be Campylobacter positive. All water samples were found to be Campylobacter negative. The Campycheck method was used for the isolation of emerging Campylobacter spp. Conclusions:,Campylobacter spp. were recovered (as contaminants) from the poultry house interior, air and environmental samples in all intensive poultry flocks surveyed. Significance and Impact of the Study:, This study highlights the need for improved biosecurity on selected poultry farms. [source] Noninvasive detection of pulmonary tissue destruction in a mouse model of emphysema using hyperpolarized 129Xe MRS under spontaneous respirationMAGNETIC RESONANCE IN MEDICINE, Issue 4 2010Hirohiko Imai Abstract In the present study, a chemical shift saturation recovery method in hyperpolarized 129Xe MR spectroscopy measurements was applied to two groups of spontaneously breathing mice, an elastase-induced emphysema model and a control group. Parameters detected were those related to lung structures and functions, such as alveolar septal thickness, h, the ratio of the alveolar septal volume relative to gas space volume, Vs/Va, and the transit time of blood through the gas exchange region, ,. To investigate the potential of these parameters as biomarkers, an attempt was made to detect physiologic changes in the lungs of elastase-treated mice. Our results showed that Vs/Va was significantly reduced in elastase-treated mice, reflecting emphysema-like destruction of the alveolar wall. Compared with histologic results, this degree of reduction was shown to reflect the severity of wall destruction. On the other hand, significant changes in other parameters, h and ,, were not shown. This study is the first application of hyperpolarized 129Xe MR spectroscopy to a mouse model of emphysema and shows that the Vs/Va volume ratio is an effective biomarker for emphysema that could become useful in drug research and development through noninvasive detection of pathologic changes in small rodents. Magn Reson Med, 2010. © 2010 Wiley-Liss, Inc. [source] An alternative analytical reduction scheme in the time-domain layered finite element reduction recovery method for high-frequency IC designMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 9 2008Houle Gan Abstract An alternative analytical reduction scheme was proposed in the time-domain layered finite element reduction recovery (LAFE-RR) method for the analysis of high-frequency integrated circuits. This alternative reduction scheme permits the use of general absorbing boundary conditions in the framework of a time-domain LAFE-RR method. In addition, it allows for an application of the LAFE-RR method to circuit problems in which the system matrices in multiple regions need to be reduced separately. Numerical and experimental results are given to demonstrate its validity. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2337,2341, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23630 [source] Optimal control of fuel processing system using generalized linear quadratic Gaussian and loop transfer recovery method,,ASIAN JOURNAL OF CONTROL, Issue 5 2010Huan-Liang Tsai Abstract This paper proposes an optimal control system that consists of both feedforward and state-feedback controllers designed using a generalized linear quadratic Gaussian and loop transfer recovery (GLQG/LTR) method for a fuel processing system (FPS). This FPS uses natural gas as fuel and reacts with atmospheric air through a catalytic partial oxidation (CPO) response. The control objective is focused on the regulatory performance of the output vector in response to a desired stack current command in the face of load variation. The proposed method provides another degree of freedom in the optimal control design and gives the compensated system a prescribed degree of stability. Finally, the numerical simulations of compensated FPS reveal that the proposed method displays better performance and robustness properties in both time-domain and frequency-domain responses than those obtained by the traditional LQ Method. Copyright © 2010 John Wiley and Sons Asia Pte Ltd and Chinese Automatic Control Society [source] | ||||||||||