Discriminable Sensing Response Behavior to Homogeneous Gases Based on n-ZnO/p-NiO Composites.

Metal oxide semiconductor (MOS) gas sensors have the advantages of high sensitivity, short response-recovery time and long-term stability. However, the shortcoming of poor discriminability of homogeneous gases limits their applications in gas sensors. It is well-known that the MOS materials have similar gas sensing responses to homogeneous gases such as CO and H, so it is difficult for these gas sensors to distinguish the two gases.

[Vascular endothelial growth factor gene transfection and survival of the random skin flap in rats].

Objective: To investigate the effects of vascular endothelial growth factor (VEGF) gene transfection on survival of the random skin flap in rats.

Method: Thirty SD rats were randomized equally into 3 groups: pcDNA3-VEGF165, pcDNA3 and control groups, with the former two groups transfected via liposome with pcDNA3-VEGF165 and pcDNA3 respectively 48 h before and during the operation. Ischemic random skin flaps ( 1 cmx7 cm) were constructed from the rats.

[Analysis and treatment of complications induced by polyacrylamide hydrogel injection].

Objective: To explore the reasons for the complications of polyacrylamide hydrogel injection.

Methods: 39 patients were included in this study, who had complications after polyacrylamide hydrogel injection in the breasts, nose, temproal area or depressed locus. The clinical manifestations of the complications were analyzed.