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Fanny Barbotin Roger Spitz Christophe Boisson 《Macromolecular rapid communications》2001,22(17):1411-1414
The synthesis of a series of neodymium complexes supported on modified silica is reported. In an initial step the silanol groups were masked by a Lewis acid (BCl3, AlCl3, TiCl4, ZrCl4, SnCl4, SbCl5, HfCl4), and then a soluble arene complex Nd(η6‐C6H5Me)(AlCl4)3 formed in situ was reacted with the modified silica. The supported complexes are active and highly stereospecific for butadiene polymerization; 1,4‐cis insertion is superior by 99%. The catalyst based on a treatment of silica with BCl3 is the most efficient. 相似文献
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Duran-Paramo Enrique Garcia-Kirchner Oscar Hervagault Jean-Franç ois Thomas Daniel Barbotin Jean-Noël 《Applied biochemistry and biotechnology》2000,84(1-9):479-485
The effect of glucose on the α-amylase production by Bacillus subtilis ATCC-21556 was studied. Initial glucose concentrations up to 20 g/L were found to be directly proportional to the specific
α-amylase production in an immobilized-cell batch system, whereas a free-cell batch system presented an inversely proportional
relationship with the initial glucose concentration. This might be owing to the α-amylase repression by the glucose present
in the culture medium. Three hundred eighty-five percent of the specific α-amylase production with the free-cell system was
produced by the immobilized-cell batch culture. 相似文献
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