多功能偏振光演示仪在教学中的应用

设计了多功能偏振光演示仪,清晰地演示了偏振光的马吕斯定律、色偏振以及互补色原理.     

中枢5-羟色胺在电针镇痛耐受中的作用

给大鼠多次电针,电针镇痛效果逐渐减弱,而产生电针镇痛耐受,并与吗啡镇痛产生交叉耐受。脑室注射5-羟色胺(5-HT)的前体可以翻转电针镇痛耐受。测定电针镇痛耐受的动物脑内5-HT含量和更新率并不降低,5-HT受体的最大结合力也未见下降。多方面的资料表明,机体对内源性释放的5-HT发生耐受,可能是电针镇痛耐受的一个重要原因。     

两步化学气相沉积法制备In2Se3/MoSe2范德华尔斯异质结

Two-dimensional transition metal dichalcogenides heterostructures have stimulated wide interest not only for the fundamental research,but also for the application of next generation electronic and optoelectronic devices.Herein,we report a successful two-step chemical vapor deposition strategy to construct vertically stacked van der Waals epitaxial In₂Se₃/MoSe₂ heterostructures.Transmission electron microscopy characterization reveals clearly that the In₂Se₃ has well-aligned lattice orientation with the substrate of monolayer MoSe₂.Due to the interaction between the In₂Se₃ and MoSe₂ layers,the heterostructure shows the quenching and red-shift of photoluminescence.Moreover,the current rectification behavior and photovoltaic effect can be observed from the heterostructure,which is attributed to the unique band structure alignment of the heterostructure,and is further confirmed by Kevin probe force microscopy measurement.The synthesis approach via van der Waals epitaxy in this work can expand the way to fabricate a variety of two-dimensional heterostructures for potential applications in electronic and optoelectronic devices.     

THE IMPLICATION OF CENTRAL SEROTONIN IN ELECTRO-ACUPUNCTURE TOLE

Electro-acupuncture (EA) applied to both legs for 30min raised the tail flick latencyof the rat significantly. This effect of EA analgesia became attenuated and finally disap-peared after repeated EA stimulations, which was termed EA tolerance. EA tolerance and itscross tolerance to morphine analgesia were found to be partially reversed by intracerebro-ventricular injection of 5-hydroxytryptophan (5-HTP), the precursor of 5-hydroxytryptamine(5-HT). However, there was no depletion in cerebral 5-HT, nor was there decrease ofthe number of 5-HT receptors in the brain of the EA tolerant animals. Results obtainedfrom different lines of analysis point to the conclusion that development of tolerance toprofoundly released 5-HT during prolonged EA stimulation may constitute one of themechanisms for EA tolerance.