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排序方式: 共有159条查询结果,搜索用时 15 毫秒
1.
Billardon M. Elleaume P. Ortega J. Bazin C. Bergher M. Velghe M. Deacon D. Petroff Y. 《Quantum Electronics, IEEE Journal of》1985,21(7):805-823
In this paper we review the results obtained in the last two years with the Orsay free electron laser. 相似文献
2.
IKs channels are composed of IsK and KvLQT1 subunits and underly the slowly activating, voltage-dependent IKs conductance in heart. Although it appears clear that the IsK protein affects both the biophysical properties and regulation of IKs channels, its role in channel pharmacology is unclear. In the present study we demonstrate that KvLQT1 homopolymeric K+ channels are inhibited by the IKs blockers 293B, azimilide and 17-beta-oestradiol. However, IKs channels induced by the coexpression of IsK and KvLQT1 subunits have a 6-100 fold higher affinity for these blockers. Moreover, the IKs activators mefenamic acid and DIDS had little effect on KvLQT1 homopolymeric channels, although they dramatically enhanced steady-state currents through heteropolymeric IKs channels by arresting them in an open state. In summary, the IsK protein modulates the effects of both blockers and activators of IKs channels. This finding is important for the action and specificity of these drugs as IsK protein expression in heart and other tissues is regulated during development and by hormones. 相似文献
3.
New advances in theoretical background and recent experimental results concerning nanometer scale metallic clusters are presented. We will begin by a presentation of the advantages and the limitations of synchrotron radiation techniques to characterise nanometer scale entities. Then, through a review of recent papers, we try to make a link between metallic surfaces and nanometer scale monometallic clusters in the case of the interaction with a small molecule, namely NO. 相似文献
4.
The gelatinisation temperatures, pasting characteristics and enzymic susceptibilities in the temperature range 48–72°C of normal, high amylose, low amylose and zero amylose barley starches were determined. Normal starches had the lowest gelatinisation temperatures, but low and zero amylose starches had the lowest pasting temperatures. Normal starches were the most readily soluble in water at 48–60°C in the presence of a mixture of α‐amylase, β‐amylase and limit dextrinase and were most readily broken down to reducing sugars by these enzymes. High amylose starch was the most resistant to enzymic hydrolysis in the temperature range 48–72°C and, hence, produced the lowest level of reducing sugars. 相似文献
5.
Claudia Kuster Jean‐Charles Bazin Cengiz Öztireli Teng Deng Tobias Martin Tiberiu Popa Markus Gross 《Computer Graphics Forum》2014,33(2):1-10
Multi‐view reconstruction aims at computing the geometry of a scene observed by a set of cameras. Accurate 3D reconstruction of dynamic scenes is a key component for a large variety of applications, ranging from special effects to telepresence and medical imaging. In this paper we propose a method based on Moving Least Squares surfaces which robustly and efficiently reconstructs dynamic scenes captured by a calibrated set of hybrid color+depth cameras. Our reconstruction provides spatio‐temporal consistency and seamlessly fuses color and geometric information. We illustrate our approach on a variety of real sequences and demonstrate that it favorably compares to state‐of‐the‐art methods. 相似文献
6.
T. Lesage C. Verrier P. Bazin J. Saussey S. Malo C. Hedouin G. Blanchard M. Daturi 《Topics in Catalysis》2004,(1):31-36
In situ FT-IR spectroscopy coupled with mass spectrometry have been used to study the mechanism of nitrates formation and reduction over a common Pt–Rh/Ba/Al2O3 NO
x
storage catalyst, compared with a different alumina-based compound.The experimental device used consists of a transmission reactor cell (having a very small dead volume) dedicated to the evolution of surface species, and of a mass spectrometer combined with a FT-IR micro-cell for gas analysis, allowing time resolved analysis in stationary and transient conditions.At the first time the nitration properties of the catalysts under a lean flow have been studied in the appropriate temperature window (473–673 K). The dynamics of nitrates formation has been pointed out, as well as the different coordination sites on the compounds surface. Then the catalysts have been alternatively exposed to rich and lean flows very close to the real exhaust composition. This has allowed the identification of reduction pathway, active sites, intermediate species and by-products for NO
X
-trap reaction. In particular, we have differentiated the role of the support and of the noble metal in the mechanism, as well as of isocyanate adspecies and ammonia among the detected species. The very high NO
X
storage properties and the selectivity (near 100%) in nitrogen of the newly designed catalyst have been pointed out. 相似文献
7.
This paper presents an algorithm for choosing the order in which pseudo-intents are enumerated when computing the Duquenne–Guigues basis of a formal context. Sets are constructed through the use of a spanning tree to ensure they are all found once. The time and space complexities of the algorithm are empirically evaluated using, respectively, the number of logical closures and the number of sets in memory as measures. It is found that only the space complexity depends on the enumeration order. 相似文献
8.
Hugo Durou David Pech David Colin Patrice Simon Pierre-Louis Taberna Magali Brunet 《Microsystem Technologies》2012,18(4):467-473
In this paper a wafer-level process is proposed to fully integrate carbon-based micro-supercapacitor onto silicon substrate.
This process relies on the deposition of a paste containing carbon, PVDF and acetone into cavities etched in silicon. After
electrolyte deposition in a controlled atmosphere, a wafer-level encapsulation is realized. Cyclic voltammetry performed on
non-encapsulated micro-components showed specific energy of 257 mJ cm−2 for 336 μm deep cavities. The specific encapsulation process developed was tested separately and proved to be efficient in
terms of resistance to organic electrolytes and mechanical strength. 相似文献
9.
10.
Cabernet sauvignon red wine astringency quality control by tannin characterization and polymerization during storage 总被引:1,自引:0,他引:1
Kleopatra?Chira Michael?Jourdes Pierre-Louis?TeissedreEmail author 《European Food Research and Technology》2012,234(2):253-261
Cabernet Sauvignon wine grape variety is an emblematic cultivar of Bordeaux winegrowing region. Twenty-three vintages of Cabernet
Sauvignon wines from chateau Mouton Rothschild were studied using chemical and sensory analysis. Total phenolic compounds,
total anthocyanins, total tannins, hue, CI (colour intensity), titratable acidity, ethanol level and pH were evaluated. Percentage
of galloylation (%G), of prodelphinidins (%P) as well as mean degree of polymerization (mDP) were also determined. Sensory
analysis concerning astringency intensity using a 0–7 point scale was performed in parallel. Correlations between bottle wine
ageing and mDP and astringency were obtained. Increasing age gave lower scores in astringency intensity (R
2 = 0.598, p = 0.000) and inferior mDP values (R
2 = 0.851, p = 0.000). In addition, we evidenced that mDP is an analytical parameter for estimating astringency (R
2 = 0.556, p = 0.000) in red CS (Cabernet Sauvignon) wine from Pauillac denomination. 相似文献