Catalytic Combustion of Model Carbon Particles (CPs) over Pt/β-SiC Catalyst

Platinum catalyst supported on a medium surface area -SiC was successfully used for the catalytic combustion of model carbon particles and compared to a catalyst supported on a low surface area -SiC. The -SiC-based catalyst showed no deactivation as a function of cycling tests while a strong deactivation was observed on the -SiC-based catalyst. This deactivation was attributed to the progressive encapsulation of the platinum particles by a layer of silica which built up during the combustion cycle. These results render possible the use of Pt/-SiC catalyst as a diesel carbon particle catalytic filter with continuous regeneration.     

On the necessity of explicit cross-layer data formats in near-data processing systems

Distributed and Parallel Databases - Massive data transfers in modern data-intensive systems resulting from low data-locality and data-to-code system design hurt their performance and scalability....     

Microecological regulative principles of human gastrointestinal flora

In the course of coevolution of man and microorganisms the macroorganism must have developed mechanisms which allow a qualitative and quantitative regulation in his microbial colonization. On the several places, microbial growth is limited by various factors. Adherence ability of microorganisms belongs to the special colonization events. An uninhibited colonization begins if regulative factors are omitted. Factors of the host are only partially able to kill the microorganisms. Microbes possess signal receptors managing adaptation to environmental changes. If a strategy of growth and multiplication is not realizable such factors change to a strategy of survival. Very likely, these common microbiological principles are valid to the gastrointestinal tract, too.     

轧染时的直接上染性(第2部分):还原性染料、硫化还原性染料

第1部分介绍了浸轧染色的印花头梢色差和宽度上染色印疵的形成原因.第2部分以实验经验,说明使用水不溶性染料产生的染色问题.     

Functional display of active bovine adrenodoxin on the surface of E. coli by chemical incorporation of the [2Fe-2S] cluster

The display of heterologous proteins on the surface of living cells bears promising options for a wide variety of biotechnological applications. Up to now, however, cellular surface display was merely restricted to simple polypeptide chains. Here we present for the first time the efficient display of a protein (bovine adrenodoxin) that contains an inorganic, prosthetic group in its active form on the surface of Escherichia coli. For this purpose apo-adrenodoxin was transported to the cell surface and anchored within the outer membrane by the autotransporter pathway. Incorporation of the iron-sulfur cluster was achieved by a single-vial, one-step titration under anaerobic conditions. The biological function of surface-displayed holo-adrenodoxin could be established through adrenodoxin-dependent steroid conversion by two different cytochrome P450 enzymes and the number of functional molecules on the cell surface could be determined to be more than 10(5) per cell. Neither the expression of adrenodoxin nor the incorporation of the chemical iron-sulfur cluster reduced the viability of the bacterial cells.     

Removal of NOx: Part II. Species formed during the sorption/desorption processes on barium aluminates

The formation of various species formed during the adsorption of NO_x issued from a synthetic lean-burn exhaust gas upon barium aluminates was studied using FTIR and TGA. The results have been systematically compared to those obtained with bulk BaO. Two factors are responsible for the difference observed during adsorption/desorption tests on the two solids. On one hand, stable carbonates are formed on BaO whereas no carbonate is formed on barium aluminate. On the other hand, the structure of the nitrates formed on these two compounds is very different, an N-bounded nitrate is formed on barium aluminate and not on bulk BaO.