Objective: To integrate the toxic component of cantharidin (CTD) into a novel nanostructured lipid carrier (NLC) and optimize the cantharidin nanostructured lipid carrier (CTD-NLC) formulation process to reduce the toxicity of CTD and enhance its targeting. Methods: CTD-NLC was prepared by emulsified ultrasonic dispersion method. The encapsulation efficiency was determined by dialysis method. The average particle size, particle size distribution (polydispersity index, PDI), Zeta potential, encapsulation efficiency, and drug loading were taken as indicators. Univariate investigation and central composite design-response surface methodology (CCD-RSM) were used to optimize the prescription process of CTD-NLC. Multivariate quadratic fitting was used to evaluate the model equation between indicators and factors. The fitted equation was analyzed by the variance analysis and the optimal prescription was predicted by the resonse surface. Results: The optimized CTD-NLC prescriptions were as follow: mass of total lipid was 453.66 mg, solid to liquid lipid ratio of 1:2, total stable dose of 16.9 mg/mL, ratio of Pluronic F68 to egg yolk lecithin (Lipoid E PC S) of 3.88:1, with ultrasound for 30 min (working 2 s, stopping 2 s). The prepared CTD-NLC was clear clarification in appearance with light blue opalescence, the average particle size was (85.99 ± 0.49) nm, PDI was 0.280 ± 0.002, Zeta potential was (-8.21 ± 0.24) mV, encapsulation efficiency was (98.57 ± 0.05)%, and drug loading was (0.65 ± 0.01)%. Conclusion: The fitting model established by CCD-RSM is accurate and reliable. The optimized CTD-NLC distribution is concentrated, with high encapsulation efficiency and good physical stability. It lays a foundation for the subsequent in vitro and in vivo studies of CTD-NLC.

OBJECTIVETo study the correlation between arachidonic acid (AA) and acute red blood cells damage in rats, and to build a model with hidden blood loss in vivo, and to explore the pathological mechenism of hidden blood loss.

METHODSA total of 50 male adult Sprague-Dawley rats weighing (200 ± 20) g were randomly divided into five groups (n = 10): control group and four experimental groups. The rats in the experimental groups were given 0.5 ml different concentrations of AA dilu- ents, 5, 10, 20, 40 mmol/L respectively. The blood samples were collected from orbital venous at the beginning and 24, 48, 72 hours after administration. Then the changes of hemoglobin (Hb) ,red blood cell count (RBC), glutathione peroxidase (GSH- PX) activity, total superoxide dismutase (T-SOD) activity and hydrogen peroxide (H202) in the blood samples were tested.

RESULTSSignificant hidden blood loss occurred when the concentration was 10 mmol/L in the experimental group, with the RBC and Hb sharply reduced in blood samples. The Hb and RBC were reduced in all the experimental groups and control group at 24 hours after administration, while in the experimental groups they changed more obviously. The GSH-PX activity, T-SOD activity and H₂O₂were also significantly reduced in all groups, and the changes showed significant differences. The Hb and RBC were relatively stable in the control group and the experimental groups at 48 hours after administration; while GSH-PX activity, T-SOD activity and H₂O₂were all significantly decreased, and the changes in the experimental groups were more notable.

CONCLUSIONElevated levels of AA in the blood causes oxidative stress in the red blood cells, leading to the damage of red blood cells and hemoglobin, which is responsible for hidden blood loss.

Animals ; Arachidonic Acid ; toxicity ; Erythrocytes ; drug effects ; metabolism ; Glutathione Peroxidase ; blood ; Hemoglobins ; analysis ; Male ; Rats ; Rats, Sprague-Dawley ; Superoxide Dismutase ; blood

Objective To understand the status of the life mcaning among medical students.Methods Totally 300 students in our school were measured by the scale of purpose in life test (PIL)to analyze the status and influencing factors of life meaning.The questionnaire data were analyzed by using two independent samples t-test,One-way ANOVA and multiple linear regression.Results The average score of the life meaning survey of medical students was 84,the life goal and life value dimension scores were relatively high and the life attitude and life independent dimension scores were low.Meanwhile,the life mean in scores were higher in senior students than in junior students ( P =0.003 ),higher in undergraduate students than in college students (P =0.021 ),higher in students from urban cities than in students from rural areas ( P =0.004),higher in student leaders than in non student leaders (P =0.001 ),higher in students liking their majors than in students disliking their majors (P =0.003).Conclusions The formation of medical students' life meaning is influenced by a variety of factors.Educators need to seize the important period of students' growth and launch some targeted educational activities.Meanwhile,in order to enhance the medical students' life meaning,it is also necessary to consolidate the professional education,increase students' self-identity and guide them to correctlv view social problems.

Objective To study the impact of human leukocyte antigen (HLA)-B specific Bw4 epitope on disease progression of hepatitis C virus (HCV) infection.Methods Eighty-six cases of HCV infection through paid blood donation were enrolled in the study.Enzyme-linked immunosorbent assay (ELISA) to detect HCV IgG and IgM,real-time reverse transcriptation polymerase chain reaction (RT-PCR) to detect HCV RNA,and sequence specific primer-polymerase chain reaction (SSP-PCR) to analyze HLA type was performed.Categorical data were analyzed by chi-square test,and measurement data were compared by independent sample t test.Results Among the 86 HCVinfected individuals,there were 29 (33.7 ％) cases of Bw4/4 homozygote,38 cases (44.2 ％) of Bw4/6 heterozygote and 19 (22.1％) cases of Bw6/6 homozygote.The HCV RNA levels in Bw4/4 group,Bw4/6 group and Bw6/6 group were (3.98±0.32),(5.22±0.29),(5.04±0.38) lg IU/mL,respectively.The HCV RNA level in Bw4/4 group was significantly lower than those in the other two groups (t=2.821,P=0.0063 ; t =2.106,P =0.0407,respectively).The spontaneous clearance rates of Bw4/4 group,Bw4/6 group and BW6/6 group were 58.6％,26.3％ and 21.0％,respectively.The spontaneous clearance rate of Bw4/4 group was significantly higher than those of Bw4/6 group and Bw6/6 group (x2 =7.135,P =0.008; x2 =6.583,P =0.010,respectively).HCV infected individuals with homozygous epitopes of Bw4/4 had 4.351 times higher probability of spontaneous viral clearance than that of Bw4/6 heterozygote or Bw6/6 homozygote (OR=4.351,95％CI:1.676-11.294).Conclusions Homozygosity for HLA-Bw4-bearing B alleles is associated with significant lower HCV viral load and higher spontaneous clearance rate.The HLA-Bw4 epitopes have a protective effect against HCV infection.

Objective To investigate the effects of different cyclic tensile strain on the proliferation of human anulus fibrosus cells from degenerated discs.Methods Anulus fibrosus(AF) cells were isolated from a degenerated human IVD,expanded in monolayer,and cyclically strained for 3 hours,applying 0,5％,10％,15％ and 20％ strains at a frequency of 0.25 Hz with the use of the DioDynamic test instrument.The flow cytometry method was used to examine the Af cells proliferation at 24 hours following application of the cyclic tensile strains.Results The proliferative index (PI) increased with the magnitude value of cyclic tensile strain except 20％ group.The most significant increase of proliferation index were found in 15％ group.Conclusion There might be some corelationships between magnitude of cyclic tensile strain and the proliferation of the degenerative AF cells.

Objective: To investigate the role of human umbilical vein endothelial cells (HUVEC) in supporting hematopoiesis and the expansion of hematopoietic stem/progenitor cells in vitro. Methods: According to the fact that HUVEC supernatant has colony stimulating activity shown by methylcellulose colony-forming assay and HUVEC can maintain the survival of mononuclear cells for at least four weeks in vitro, CD34+ cells from umbilical cord blood were seeded with (HUVEC group) or without (control group) HUVEC monolayer. Every week cells were collected and counted, the frequency of CFU-GM was measured by using methylcellulose colony-forming assay, and the percentage of CD34+ and CD41a+ cells was measured by flow cytometry. Results: In control group，all the CD34+ cells died in two weeks. However, in HUVEC group,most nucleated cells and CD34+ cells were expanded by 68.1±14.8 fold and 6.6±1.4 fold，respectively at the third week while CFU-GM expansion reached its peak (5.7±2.1 fold) at the week 2. Moreover, the percentage of CD41a+ cells was enhanced significantly, reaching a maximum (15.6%) at the week 3. Conclusions:HUVEC can support hematopoiesis in vitro and expand the hematopoietic progenitor cells and CD41a+ cells in direct contact coculture.

This paper discussed the application of designing experiments from scientific research in Micro-biology courses and its effects on the teachers and students. The problems of the application of designing experiments in Microbiology courses were analyzed. The practice of the teaching reform showed that it give great advantages for the undergraduates with the enhancement of their ability on theory application and sci-entific innovation. This teaching reform could be widely popularized.

Aimed at the current plight of medical students' professionalism education,such as ignoring the top -level design and the overall plan but emphasizing practice,ignoring the permeability of professional spirit but emphasizing the impartation of professional knowledge,ignoring humanities but emphasizing professional issues in curriculum setting,Capital Medical University advocated the all-dimensional education philosophy implenented by all staff through the whole process,made top-level design scientifically for medical students' professionalism education.The university strengthened professionalism through teaching,permeated professionalism through a series of educational activities,consolidated professionalism through clinical practice,and thus to strengthen the cultivation of medical students' professionalism and realize scientific education by all staff and throughout the whole process.

Objective To create a whole process management database of urolithiasis and to discuss the application value of the database.Methods According to the 2014 guidelines for urolithiasis of CUA and the needs of follow up and research, a clinical management database of urolithiasis was established using ASP.NET and Microsoft SQL Server 2008, collected the data from hospital information system (HIS), laboratory information management system (LIS), picture archiving and communication systems (PACS), clinical information system(CIS), radiology information system(RIS), electronic medical record(EMR) and follow-up system.Results The database system was user-visually, stable, data communication automatically and query securely.This database was based on the general information of urolithiasis included clinical pathway, diagnosis, treatment, prevention, follow up and charge.It supplied strong foundation and platform for statistics analysis, improving efficiency and quality of urolithiasis scientific research.Conclusions The database of urolithiasis can be established by computerized information management system, which could be beneficial not only to information management of case record but also to clinical, and research works.

Objective To compare scene simulation teaching method with traditional methods on training in cardiopulmonary resuscitation (CPR) for the practice students. Methods A convenience sample of 62 nursing students in the emergency department of our hospital in 2014 were recruited as the observation group,and 75 practice students in 2013 were recruited as the control group. The observation group used the scene simulation teaching method for students and the control group used the traditional methods. The students′theoretical knowledge, operation skill of CPR and total score of core capability were compared between two groups. Results The theoretical knowledge, operation skill of CPR and total score of core capability in the observation group were (85.23±6.36), (86.90±4.85), (217.98±6.06), significantly higher than those of the control group, which were (75.36±7.77), (82.38±8.84), (209.33±8.91), t= 8.02, 3.60 and 6.50, P<0.01. Conclusions The scene simulation teaching method is an effective form of emergency department training in CPR, help to improve students practice ability and the ability of emergency cardiopulmonary resuscitation.