AIM: To study the effects of propofol on plasma membrane fluidity in PC12 cells and liposome,and its relevant mechanism. METHODS: Fluorescence depolarization method was used to measure values of fluorescence anisotropy, fluorescence polarization as well as microviscosity in PC12 cells and microviscosity in liposome continuously for 30 min. RESULTS: Propofol induced a significant decrease of fluorescence anisotropy, fluorescence polarization as well as microviscosity in PC12 cells, particularly in the first 5 min. After 5 min, the values of anisotropy were remained lower levels. Although propofol at concentration of 1 mg?L -1 had no effects on microviscosity in liposome, porpofol at concentration of 10 mg?L -1 and 100 mg?L -1 significantly decreased microviscosity in liposome. CONCLUTION: Propofol can significantly increase membrane fluidity in PC12 cells and liposome in a concertration dependent manner, and the anesthetic effect of propofol may be resulted from changes of membrane fluidity and structure of neurocyte.

The porous foams were prepared by the solvent-casting and particulate-leaching technique using poly(DL-lactide) (PDLLA), poly(DL-lactide)/hydroxyapatite (PDLLA/20wt%HA), and poly(DL-lactide)/beta-tricalcium phosphate(PDLLA/20wt% beta-TCP) respectively. Observations by scanning electron microscopy indicated that the HA and beta-TCP were homogeneously dispersed in the polymer matrix, and the pores of the foams are interconnected, resulting in continuous pore structures. The porosity of PDLLA/HA and PDLLA/beta-TCP foams was lower than that of the pure PDLLA foams, but the compression strength was higher than that of the pure PDLLA foams. The results of the degradation in vitro showed that both HA and beta-TCP had significant inhibitory effects on the degradation of PDLLA, especially the HA. It is expected that the composite foams are of use as scaffolds for bone tissue engineering.
Biocompatible Materials ; chemistry ; Bone Substitutes ; chemical synthesis ; chemistry ; Calcium Phosphates ; chemical synthesis ; chemistry ; Durapatite ; chemical synthesis ; chemistry ; Polyesters ; chemical synthesis ; chemistry ; Polymers ; chemistry ; Porosity ; Tissue Engineering

Objective:To explore the clinical effects of the "Disease-Characteristics" project in improving the nursing quality of patients with diabetic retinopathy (DR) .Methods:Based on the content framework of "Disease-Characteristics", authoritative data of UpToTate and various guidelines were transformed into evidence for clinical application through the steps of evidence-based nursing, and a standardized "Disease-Characteristics" project for DR patients was constructed. Convenience sampling was adopted to select nurses who worked in the Shanghai Eye Hospital and the Ophthalmology Department of Shanghai First People's Hospital from January 1, 2018 to June 30, 2019 as research nurses. Convenience sampling was used to select 223 DR patients admitted to the two hospitals from October 30, 2018 to January 31, 2019 (before implementation) as the control group, and 261 patients with DR admitted from February 1, 2019 to April 30, 2019 (after implementation) as the observation group. We observed and compared indicators such as the correct rate of nurses' assessment of each key link of DR patients before and after implementation, the awareness rate of patients' DR-related knowledge, and the incidence of postoperative complications of patients.Results:After the implementation, the scores of the nurses in the assessment of each key link of DR patients increased from (90.36±1.16) to (96.72±1.13) , and the difference was statistically significant ( t=52.990, P<0.05) . The disease-related knowledge score of DR patients increased from (74.330±12.154) to (78.386±10.094) , and the difference was statistically significant ( t=4.010, P<0.05) . Postoperative complications such as persistent high intraocular pressure, vitreous rebleeding, inflammatory edema and diplopia were improved, and the differences were statistically significant ( χ2=7.131, 5.618, 5.788, 6.128; P<0.05) . Conclusions:The "Disease-Characteristics" project plan based on the best evidence has a certain significance for improving the nursing quality of DR and the prognosis of patients.