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中国科协不久前发布了他们组织的调查结果:我国仪器仪表中的主体分析仪器,社会上正在应用的有90余种分析仪器,我国能够生产的产品为20余种,不到总量的1/3。其中,生命科学专用仪器约有80余种,我国商品化的生命科学专用仪器产品只有6种,目前在研的约10多种,离市场需求相差很远,这是数量上的差距。 相似文献
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We investigate the influence of correlation between water molecules transport through the neighbouring nanopores, whose centres are at a distance of only 6.2A, using the molecular dynamics simulations. Water molecule distribution in nanopore and average water flow are obtained. It is found that the average water molecule number and water flow are slightly different between a system made of the neighbouring nanopores and a system of a single pore. This indicates that transport of water chains in neighbouring pores do no show significant influence each other. These findings should be helpful in designing efficient artificial membrane made of nanopores and providing an insight into effects of the biological channel structure on the water permeation. 相似文献
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To investigate asymmetric neurocognitive representation of ethnic in-group and out-group members, we recorded event-related potentials (ERPs) to faces in a perceptual task after the faces had been primed with positive or negative affective links. The affective link priming did not influence the ERPs to ethnic out-group faces. However, relative to the positive affective link priming, the negative affective link priming increased the amplitudes of an early frontal negativity (N100) and a following central negativity but decreased the amplitude of a late positive potential elicited by ethnic in-group faces. Moreover, the N100 amplitude correlated with the degree of negative attitudes towards ethnic in-group faces. The findings suggest that multiple-level neural mechanisms are involved in individuation of heterogeneous ethnic in-group faces. 相似文献