Objective To assess the therapeutic effects of activated charcoal on the acute dichlorvos poisoning in rats. Method Thirty male clean grade Wistar rats were randomly (random number) divided into three groups: control group (group A, n = 10), single dose activated charcoal group (group B, n = 10) and multi-dose activated charcoal (group C, n=10). The rats of group A were suffered from 35 mg/kg dichlorvos exposure by oral without activated charcoal and senna. The rats of group B received 35 mg/kg dichlorvos exposure by oral with 175 mg/kg activated charcoal given immediately after dichlorvos exposure and 35 mg/kg senna given half an hour later. In the group C, 35 mg/kg dichlorvos was given to rats by oral with 175 mg/kg activated charcoal given immediately after dichlorvos exposure and 35 mg/kg senna given half an hour later and then every four hours. Blood samples were collected from the carotid artery at different intervals after exposure. DDVP concentration and total blood acetyl-cholinesterase activity were detected. Differences in serum DDVP concentration, Cmax, AUC (0→∞ ), MRT and acetylcholinesterase among three groups were calculated by using ANOVA. Results Serum DDVP levels in single dose group and in multi-dose group were significantly different from those in control group (P < 0.05). The DDVP levels in multi-dose group were significantly different from those in single dose group 4 hours after exposure (P < 0.05). The AUC and Cmax in activated charcoal treatment groups were significantly different from those in control group (P < 0.05). There were no significant differences in MRT among three groups. Fours hours after exposure to dichlorvos,the levels of serum acetylcholinesterase in rats of group B and group C were significantly different from that in rats of group A (P < 0.05), and there was no significant difference in acetylcholinesteras between group B and group C (P > 0.05). Another four hours later, no differences in acetylcholinesterase were found a-mong three groups (P > 0.05). Conclusions The peak concentrations of dichlorvos in blood are lower in group B and group C, and the blood acetylcholinesterase inhibition is quelled by activated charcoal. Therefore, the effects of multi - dose of activated charcoal is better than that of single dose of activated charcoal.

Objective To prepare the long-circulating liposomes of paraoxonase(PON).Methods The long-circulating liposomes of paraoxonase were prepared by film dispersion method.The encapsulation efficiency was determined by gel column.The effects of the factors on the encapsulation efficiency,such as the weight ratio of paraoxonase to phospholipid,cholesterol(Choi) to phospholipid,PEG-cholesterol (PEG-Chol) and the iron strength of water phase,were investigated respectively.Then the formulation was optimized by orthogonal design.Results The encapsulation efficiency of the paraoxonase liposomes was 87.66±3.46%,and the average diameter of the liposomes was about 126 nm.There was no significant change on encapsulation efficiency on 15 d at 4 ℃,and the activity of paraoxonase was maintained basically stable.Conclusion The preparation of PEG-modified paraoxonase liposomes was easy and practicable,and the property investigation in vitro showed that the paraoxonase liposomes were stable.

OBJECTIVE To analyze for mutations of the PDS gene in patients with sensorineural hearing loss associated with enlarged vestibular aqueduct and analyze the molecular pathogenesis of enlarged vestibular aqueducts. METHODS Eighteen sporadic cases of large vestibular aqueduct syndrome and twelve control individuals with normal hearing were included in this study. Exons 6 and 9 of the PDS gene in all subjects were amplified by polymerase chain reaction and analyzed by direct DNA sequencing. RESULTS Analysis revealed 2 single base changes in exon 6 of one patient with large vestibular aqueduct syndrome. One was a G→C transversion at nucleotide position 611, and the other was a T→G transversion at nucleotide position 612, resulting in a predicted Gly→Ala substitution at position 204. No mutation in exons 6 and 9 of the PDS gene was found in the PDS gene of the control individuals. CONCLUSION Mutations of the PDS gene are responsible for the large vestibular aqueduct syndrome. Analysis of the PDS leftover sequence in patients with large vestibular aqueduct syndrome is the next step in elucidating the complicated causes of this disease.

Objective To explore the effect of micro-lectures withadvanced simulation man in improving the practical skills teaching of nursing students, so as to promote the students' post competency. Methods Totally the 186 nursing internswere divided into control group and observation group by random number method with 93 people in each group. The control group used the traditional teaching modein the teaching of practical skills.The observation group used the micro-lectures with high simulation teaching.Comparing the two groups of nursing students comprehensive assessment test simulation results in the theory, skills, scenarios, and nursing students the evaluation of the curriculum. Results The scores of the two groups were all above the qualification line, but the scores of the observation group were significantly higher than those of the control group (P<0.05). The theoretical examinations and the situation simulation comprehensive testswas(77.89 ± 7.79), (75.60 ± 7.92)points in control group, and (93.87 ± 3.90),(92.87 ± 4.08)points in observation group, there was significant difference between two groups (t=17.67, 18.70,all P=0.000). The curriculum evaluation results of improving learning initiative, active curriculum atmosphere, clear operation demonstration, exercise clinical thinking, improve the clinical interest were 81.72％(76/93), 72.04％(67/93), 93.55％(87/93), 60.22％(56/93), 67.74％(63/93)in control group, and 96.77％(90/93), 95.70％(89/93), 100.00％(93/93), 92.47％(86/93), 98.92％(92/93)in observation group, there was significant difference between two groups(χ2=20.39, P=0.016).Conclusions The effect is significant of micro-lectures combined with high simulation of human using in clinical skills teaching. Thismold can conducive to the cultivation of clinical thinking of nursing students, and improve clinical comprehensive ability, and promote the promotion of nursing students post competency.

Objective To prepare paraoxonase 1 (PON1) liposomes, and investigate pharmacokinetics of common PON1 liposomes (L-PON1) and polyethylene glycol-modified PON1 long circulating liposomes (PEG-PON1-LCL) in rats after intravenous administration. Methods L-PON1 and PEG-PON1-LCL were prepared by film dispersion method. The entrapment efficiency, mean diameter and Zeta potential of the liposomes were measured, and the stability was evaluated. Thirty-six Wistar rats were divided into three groups according to random number table, with 12 rats in each group. The rats were intravenously administrated with PON1, L-PON1 or PEG-PON1-LCL 700 U/kg, respectively. The activity of PON1 in serum was determined by phenyl acetate method, the activity of PON1 at different time points after drug administration was compared with that before drug administration, and the difference value was considered as the activity of exogenous PON1, and PON1 activity-time curve was plotted. The pharmacokinetic parameters were calculated and analyzed by DAS 2.0 pharmacokinetic program and SPSS 17.0. Results The entrapment efficiencies of L-PON1 and PEG-PON1-LCL were above 85%, the mean diameter was about 126 nm, and Zeta potential was -14.35 mV. After 2 weeks of preservation, the above parameters showed no obvious change, indicating that liposomes had good stability and the properties of preparations were basically stable. Compared with purified PON1 administration, after L-PON1 and PEG-PON1-LCL administration, the activity of PON1 was increased, the half-life of PON1 activity in rats was significantly prolonged [the half-life of distribution (T1/2α, hours): 0.142±0.018, 0.147±0.021 vs. 0.126±0.022; the half-life of clearance (T1/2β, hours): 3.877±1.010, 4.520±1.117 vs. 1.226±0.422], the area under PON1 activity-time curve (AUC) was significantly increased [AUC from 0 hour to 24 hours (AUC0-24, U·h-1·L-1): 499.305±64.710, 563.576±70.450 vs. 18.053±2.190; AUC from the immediate injection to the disappearance of PON1 activity (AUC0-∞, U·h-1·L-1): 516.256±60.940, 587.801±76.210 vs. 21.044±3.250], the apparent volume of distribution (Vd) and clearance (CL) were significantly decreased [Vd (L): 0.140±0.065, 0.144±0.064 vs. 0.493±0.032, CL (L/h):0.039±0.008, 0.034±0.006 vs. 0.952±0.082, all P < 0.05]. There was no significant difference in pharmacokinetics between L-PON1 and PEG-PON1-LCL. Conclusions The film dispersion method prepared PON1 liposomes have high entrapment efficiency and small particle size with a good stability. Both liposomes can raise PON1 activity in vivo, change the pharmacokinetics of PON1 in vivo, prolong the resident time of PON1 in the blood circulating system, and compensate for the short half-life of PON1 in vivo.