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排序方式: 共有137条查询结果,搜索用时 15 毫秒
1.
Antibody microarrays are gaining popularity as a high-throughput technology to investigate the proteome. However, protein extracts from most body fluid or biopsy samples are available in very small volumes and are often unsuitable for large-scale antibody microarray studies. To demonstrate the potential for protein analysis with as little as a few nanoliters of sample, we have developed a new technology called NanoProbeArrays based on piezoelectric liquid dispensing for non-contact printing and probing of antibody arrays. Instead of flooding the protein sample on the antibody microarray surface, as in conventional microarray screening, a piezoelectric inkjet printer is used to dispense nanoliters of fluorescently labeled proteins over the antibody spots on the array. The ability of NanoProbeArrays to precisely identify and reliably distinguish between test proteins from different sources, without any loss of sensitivity and specificity as compared with conventional antibody microarrays, is illustrated here. The utility of NanoProbeArrays for biomarker identification in a complex biological sample was tested by detecting the cytokine interleukin-4 in serum. The significant reduction in volume of sample during NanoProbeArray analysis, as compared with conventional antibody microarrays, offers new opportunities for basic and applied proteomic research. 相似文献
2.
Stones belong to porous materials where water in pores plays an important role during the freeze–thaw process. A thermophysical analysis based on the pulse transient method has been used to study an ageing cycle, namely the freeze–thaw cycle. Thermophysical analysis is based on measuring the thermophysical properties under specific thermodynamic conditions. The transient method determines the specific heat, thermal diffusivity, and thermal conductivity by a single measurement. A specimen of Sander sandstone was analyzed in both dry and water-saturated states. Typical anomalies of all thermophysical parameters at the freeze–thaw point as well as differences for the dry and saturated states were found. The changes of thermophysical parameters measured when using freeze–thaw cycles correspond to stone ageing. The freeze–thaw cycle can often be encountered in building physics, concrete construction, etcPaper presented at the Seventh Asian Thermophysical Properties Conference, August 23–28, 2004, Hefei and Huangshan, Anhui, P. R. China. 相似文献
3.
Widely used electron beam welding machines are equipped with heavy power supplies, located in a special oil tank and connected with an electron gun to a high-voltage cable. A special system detects electric discharges in the electron gun space, which may arise during welding and then it tries to switch off the high voltage to interrupt an electric arc. Such disadvantages have been eliminated with the novel power supply described here. The Q of resonance circuit of this supply is stabilized and as a result circulating power appears. During an electric discharge in the gun, power is not sent to the electron gun but circulates between the electronic parts of the resonance circuit without losses and “waits” for the break in the short circuit. The power supply is much smaller and lighter than supplies of similar rating used nowadays. It is connected directly to the electron gun chamber without a high-voltage cable. The first construction of the supply was designed for electron beam welding machine of 5 kW power and 60 kV accelerating voltage. Tests of the new power supply in laboratory and industrial conditions have shown its usefulness for electron beam welding. 相似文献
4.
Katarzyna Matkiewicz Agnieszka Bukowska Wiktor Bukowski 《Journal of Inorganic and Organometallic Polymers and Materials》2012,22(2):332-341
Hydroxyl functionalized gel type resins derived from 2-hydroxyethyl, 2-hydroxypropyl and 2-hydroxy-3-phenoxypropyl methacrylates
were applied to covalent immobilization of Mn(salen) complexes via glutarate and carbonate linkers. The obtained catalysts
were characterized by FTIR and DR UV–Vis methods and elemental analysis. It was found that the activity of polymeric catalysts
obtained in this way depended on both the nature of the functional and cross-linking monomers and the degree of the cross-linking
of polymer matrices and the way of complex immobilization. The highest activity was observed for the complexes immobilized
on the HEMA resins cross-linked with 3%-mol of diethylene glycol dimethacrylate. For instance, in the presence of the catalysts
with (S,S)-salen ligand S-epoxystyrene and (1S, 2R)-epoxyindene could be obtained with 46% and 69% ee, respectively. Attempts
have also been made to recycle the selected catalyst. However, a rapid fall off in the activity was observed, although the
selectivity was similar in which three cycles. 相似文献
5.
6.
Agnieszka Bukowska Wiktor Bukowski 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》1996,67(2):176-182
The kinetics of the reaction between acetic acid and epichlorohydrin in the presence of chromium acetate and chromic anhydride have been studied. The isolation method revealed the reagents reacted with partial orders. A reduction of chromium from the oxidation level +6 to +3 has been observed when chromic anhydride was used as catalyst. A mathematical model for the overall process has been developed and the mechanism of reaction discussed. 相似文献
7.
Sulaiman Al-Khattaf Syed A. Ali Abdullah M. Aitani Naděžda Žilková David Kubička 《Catalysis Reviews》2014,56(4):333-402
Alkylbenzenes form an important segment of petrochemical industry for the manufacture of widely used commodities and specialty products. Since the last review on this topic (8), numerous new zeolite-based catalysts have been synthesized, characterized and evaluated in various transformations of aromatic hydrocarbons. This comprehensive review covers major reactions of mono-, di-, and tri-alkylbenzenes such as disproportionation, alkylation, transalkylation, isomerization, etc., over different zeolite-based acid catalysts. During the last decade, significant progress was made in the synthesis and structure determination of novel zeolites, mesoporous single crystals, hierarchic zeolites and two-dimensional zeolites. These developments have enhanced the understanding of the role of zeolites (effects of structural type, morphology, acid sites, accessibility of acid sites, shape selectivity factors) in transformations of aromatics. In this review, the emphasis is on the influence of the type of acid sites, zeolite topology, and reaction conditions on the activity, selectivity and pathways of these reactions. Thermodynamics and reaction kinetics of transformations of aromatic hydrocarbons are also discussed. This article covers mostly literature published during the period of 2002–2013. 相似文献
8.
Agnieszka Bukowska Wiktor Bukowski 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》2001,76(9):966-970
The kinetics of addition of acetic acid to epichlorohydrin carried out in the presence of both the reaction product and chromium(III) acetate catalyst have been studied. At an equimolar ratio of reagents the dilution of the reacting mixture with the reaction product has been found not to affect the reaction order. The presence of product in the starting mixture, as well as temperature increase, considerably reduces the selectivity of reaction. Side reactions of epichlorohydrin are activated. Activation energy, enthalpy and entropy of the reaction all decrease in the presence of reaction product. © 2001 Society of Chemical Industry 相似文献
9.
The partial eigenfunction expansion (PEE) method combined with the classical finite difference frequency domain (FDFD) algorithm is proposed to accelerate frequency domain analysis of waveguide components. Examples are shown validating the method both for eigenvalue and deterministic problems. 相似文献
10.
Die Bestimmung des Grenzumformgrades eines Stahles, der während der plastischen Verformung nicht überschritten werden kann, ist von großer Bedeutung. Die vorliegende Arbeit berichtet über Ergebnisse von Warmtorsionsversuchen, aus denen der Grenzumformgrad als Funktion von Temperatur und Umformgeschwindigkeit ermittelt wurde. Die Versuche wurden an den Stählen X 10 CrNiTi 18 9, 10 CrMo 9 10, X 10 CrNiMoTi 18 12, X 20 CrMoV 12 1 und X 2 NiCrNb 25 18 durchgeführt. 相似文献