Objective To realize the tactile and slip sensory functions for electromyogram controlled prosthetic hand. Methods The piezoelectric membrane polyvinylidence floride (PVDF) was used to construct a transducer for the tactile and slip sensory feedback. The fea-ture and piezoelectric response of PVDF and its mechanism of signal production were studied. The feedback control system was designed and a prototype for testing the tactile and slip sensor function was constructed and tested. Results and Conclusion The signal response of PVDF sensor is obviously, and the PVDF sensor can be used in practice.

OBJECTIVETo investigate the effect of specific anti-streptococcus mutans IgY against streptococcus mutans on dental caries development in rats.

METHODS35 wistar rats were divided into 5 groups: group A received IgY gargle; group B received IgY lyophilized powder; group C received sterilized water as control; group D and E received egg yolk food with or without specific IgY individually. They were all fed with caries-inducing diet 2000#. The number of caries scores was counted by the procedure of Keyes'.

RESULTSThere was a significant lower mean of caries scores in groups treated with IgY lyophilized powder and gargle. By treating with egg-yolk food contained specific IgY, the mean of caries scores decreased comparing with no treatment group.

CONCLUSIONLocal passive immunization with specific anti-streptococcus mutans IgY may be an effective way to prevent the development of dental caries.

Animals ; Antibodies, Bacterial ; administration & dosage ; Dental Caries ; prevention & control ; Female ; Immunization, Passive ; Immunoglobulins ; immunology ; Male ; Rats ; Rats, Wistar ; Streptococcal Vaccines ; immunology ; Streptococcus mutans ; immunology

Objective To explore the changes in inflammatory reactions in tail-suspension mice infected by Klebsiella pneumoniae from spaceflight.Methods Tail suspension was used to simulate the physiological effects of microgravity.C57BL/6 mice were randomly divided into control (Con),control+K.pneumoniae T16-169 (Con+T16-169),tail suspension (TS) and tail suspension+K.pneumoniae T16-169 (TS+T16-169) groups.The level of inflammatory cytokines TNF-α,IL-6 and IL-1β mRNA in lung tissue and the plasma cytokine concentration were detected by RT-qPCR and xMAP technology,and HE staining was used to represent the morphological changes in lung tissue.Results Compared with the control group,the expression of inflammatory cytokines in lung tissue and plasma concentrations of all experimental groups were increased,and the difference in TS+T16-169 group was the most significant (P<0.01 or P<0.001).HE staining showed that the lung tissues in Con+T16-169 and TS+T16-169 groups were damaged in different degrees,and the damage of TS+T16-169 group was the most serious.Conclusion The K.pneumoniae from spaceflight significantly increases the expression of inflammatory cytokines in lung tissue and plasma concentrations after infecting tail-suspension mice,and induces more serious damages to the lung tissue,which suggests that inflammatory reactions can be increased in tail suspension mice infected by K.pneumoniae from spaceflight.