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排序方式: 共有153条查询结果,搜索用时 187 毫秒
31.
32.
Llewellyn LE 《Natural product reports》2006,23(2):200-222
Saxitoxin (STX) was discovered early last century and can contaminate seafood and drinking water, and over time has become an invaluable research tool and an internationally regulated chemical weapon. Among natural products, toxins obtain a unique reputation from their high affinity and selectivity for their target pharmacological receptor, which for STX has long been considered to only be the voltage gated sodium channel. In recent times however, STX has been discovered to also bind to calcium and potassium channels, neuronal nitric oxide synthase, STX metabolizing enzymes and two circulatory fluid proteins, namely a transferrin-like family of proteins and a unique protein found in the blood of pufferfish. 相似文献
33.
Q Yang V Guillerm F Ragon AD Wiersum PL Llewellyn C Zhong T Devic C Serre G Maurin 《Chemical communications (Cambridge, England)》2012,48(79):9831-9833
A series of porous Zr oxoclusters-based MOFs was computationally explored for their gas storage/capture performances. The highly porous UiO-67(Zr) and UiO-68(Zr) solids show exceptionally high CH(4) and CO(2) adsorption capacities under operating conditions that make these thermal, water and mechanical resistant materials very promising for physisorption-based processes. 相似文献
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P. Llewellyn J. P. Coulomb H. Reichert J. Patarin Y. Grillet J. Rouquerol 《Journal of Thermal Analysis and Calorimetry》1992,38(4):683-692
The adsorption of argon and nitrogen on a series of MFI-type zeolites (silicalite-I (Si/Al>1000) and HZSM-5 (16相似文献
37.
N. Pellenq P. L. Llewellyn Y. Grillet J. Rouquerol 《Journal of Thermal Analysis and Calorimetry》1994,41(6):1343-1356
Then-alkanes of different lengths were preadsorbed to selectively block part of the micropores of a MFI-type zeolite, Silicalite-I. The porosity available to argon and nitrogen was then studied by quasi-equilibrium adsorption microcalorimetry and volumetry at 77K and compared to what was found for the bare zeolite. Indeed, although partial adsorption ofn-alkanes does not alter the value of the differential enthalpies of adsorption for both argon and nitrogen, then-butane preadsorption diminishes the adsorption capacity by inducing inaccessible volumes in the micropore network. Moreover, the microcalorimetric experiments clearly show thatn-butane is not evenly distributed in the zeolite channel network while the longern-alkanes used are. 相似文献
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Quasi-elastic Neutron Scattering combined with Molecular Dynamics simulations have been carried out to gain further insight
into the CO2 dynamics in LiY and NaY Faujasites. In both materials, it was pointed out that the transport diffusivity (DT) increases with the loading whereas the self diffusivity (DS) decreases. In addition, it was shown that LiY exhibits a significant slower CO2 self diffusivity process due to a strong interaction between the Li+ cation and the adsorbate molecules at the initial stage of diffusion. This result is consistent with higher simulated activation
energy in this cation exchanged faujasite form. By contrast, the transport diffusivity is revealed to be slightly faster in
LiY than in NaY. 相似文献
40.
Carole A. Llewellyn R. Fauzi C. Mantoura Richard G. Brereton 《Photochemistry and photobiology》1990,52(5):1043-1047
Abstract— Hydrophilic products of chlorophyll a photodegradation are structurally identified using UV/visible and fourier transform infrared spectrophotometry and gas chromatography-mass spectrometry. The major peak detected during reverse-phase high performance liquid chromatography of the colourless photodegradation products is identified as glycerol. Lactic, citric, succinic and malonic acids, as well as alanine, are also identified. 相似文献