染色体失活开始于X染色体失活中心（XIC），然后传播到整条染色体。
X inactivation starts at the X-inactivation center(XIC) and spreads throughout the chromosomes.
讨论了固体超强酸催化剂理论及催化剂现代表征方法，催化剂酸中心形成、失活机理，固体超强酸催化剂的应用。
Catalytic theory of solid superacid catalysts and modern analysis methods for the catalysts, structure of acidic centers, mechanisms of deactivation, applications of solid superacid are discussed.
工业试验结果表明，大分子有机物吸附和覆盖了催化剂活性中心是催化剂暂时性失活的主要原因。
The results of commercial tests showed that the main reason of temporary deactivation of catalyst was the adsorption of organics and covering of organics on the active sites of the catalyst.
糠醛脱羰催化剂失活的主要原因是大量积碳附着于催化剂表面使活性中心被包埋从而使催化剂失去活性。
The deactivation of the catalyst of furfural decarbonylation is mainly due to carbon deposition attached to the catalyst surface, it leads to the active site embedded, so the catalyst losed activity.
糠醛脱羰催化剂失活的主要原因是大量积碳附着于催化剂表面使活性中心被包埋从而使催化剂失去活性。
The deactivation of the catalyst of furfural decarbonylation is mainly due to carbon deposition attached to the catalyst surface, it leads to the active site embedded, so the catalyst losed activity.
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