Considering the importance of the hydrogen bonding interactions between thiourea moiety and substrates in amine-thiourea catalyzed asymmetric reactions,we designed and synthesized a novel class of amine-thiourea catalysts through application of the strategy of multiple hydrogen bonds synergistic activation for the first time.

The paper analyses the plights and causes of exploitation of traditional strategic resources,illustrates openness,unity,coordination of systems thoughts in our strategic resources development and utilization.

Scientific spirits is a system,which has the characters of openness,dynamics,hierarchical quality and coordination of systems science.

But there is lack of coordination in these aspects in China,for example,in social economic structure,marketing system of financial products,system construction and talent training.

This model not only can explain cooperativity effect in the regulation of allosteric enzyme, but also can explain anticooperativity effect in the regulation of allosteric enzyme.

This article concerns the cooperativity of visual information hierarchical processing in the human brain by using Functional magnetic resonance imaging (fMRI).

Under the influence of economic globalization democratic politics and cultural diversity, the relationship between the enterprise goals and employee goals becomes more complicated and changeable, thus it is of great importance to identify the factors that influence the cooperativity of the two goals and to adopt the corresponding policies for the survival and development of the enterprises.