AIM:To explore relationship between the normal strehl ratio ( SR ) values of total aberrations/SR values of total higher-order aberrations and modulation transfer function ( MTF ) at total corneal at different pupil diameters in normal population.
METHODS: To exam the SR values of total aberrations and SR values of total higher-order aberrations of total corneals in 200 people ( 400 eyes ) using SIRIUS 3D topography system and analysis the corresponding root-mean-square ( RMS) .
RESULTS: The subjects with different pupil diameters (3. 0, 5. 0, 6. 0, 7. 0mm)'s exam results of total corneal were as following:SR value of total aberrations 100’(0. 45±0. 12), (0. 25±0. 06), (0. 17±0. 05), (0. 13±0. 04); SR value of total higher order ab cerrations 100’(0. 69±0. 14), (0. 34±0. 07), (0. 24±0. 05), (0. 16±0. 04);SR value of total aberrations 200’(0. 45±0. 12), (0. 24±0. 06), (0. 20±0. 04), (0. 16±0. 03); SR value of total higher order aberrations 200’(0.70±0. 13), (0. 35±0. 07), (0. 27±0. 06), (0. 20±0.04 ) . The SR values of each group decreases with the increases of pupil diameters. The SR values of total aberrations and SR values of total higher - order aberrations at total corneals are negatively correlated with corresponding RMS value. When the pupil diameter is small, the SR value of total aberrations is more related to higher frequency region of MTF. When the pupil diameter is big, the SR value of total aberrations is more related to lower frequency region of MTF.
CONCLUSION: The visual performance of normal people can be well reflected by SR values of total aberrations and SR values of total higher - order aberrations at total corneal.

OBJECTIVETo compare the dissolution characteristics of colloidal silica and porous silica as the solid dispersion carrier, with baicalin as the model drug.

METHODThe baicalin solid dispersion was prepared by the solvent method, with colloidal silica and porous silica as the carriers. In the in vitro dissolution experiment, the solid dispersion was identified by scanning electron microscopy, differential scanning and X-ray diffraction.

RESULTThe solid dispersion carriers prepared with both colloidal silica and porous silica could achieve the purpose of rapid release. Along with the increase in the proportion of the carriers, the dissolution rate is accelerated to more than 80% within 60 min. Baicalin existed in the solid dispersion carriers in the non-crystalline form.

CONCLUSIONThe release behaviors of the baicalin solid dispersion prepared with two types of carrier were different. Among the two solid dispersion carriers, porous silica dissolved slowly than colloidal silica within 60 min, and they showed similar dissolutions after 60 min.

Calorimetry, Differential Scanning ; Colloids ; chemistry ; Drug Carriers ; chemistry ; Drug Delivery Systems ; instrumentation ; Flavonoids ; chemistry ; pharmacology ; Porosity ; Silicon Dioxide ; chemistry ; Solubility

Baicalin extremely fine powder was made by using ball-mill and the effect of micronization on the micromeritics properties of baicalin was studied and analyzed. The microstructures of baicalin ordinary and extremely fine powder were compared by scanning electron microscope, differential scanning calorimeter and X-ray diffraction and the powder characteristic of them was investigated. The hygroscopicity was studied. The effect of micronization on the dissolution of baicalin was investigated. The results showed that the chemical constituents of baicalin were not changed after micronization with better compressibility. It was confirmed that micronization technology had a certain application value in promoting the insoluble component of baicalin absorption with higher dissolution.
Calorimetry, Differential Scanning ; Drugs, Chinese Herbal ; chemistry ; Flavonoids ; chemistry ; Particle Size ; Solubility ; Wettability ; X-Ray Diffraction

Objective To investigate the expression of survivin and bcl-2 in human squamous cell carcinoma (SCC) lesions and cell line SCL-1. Methods Tissue samples from 60 patients with SCC and 10 normal human controls were immunohistochemically stained to detect the expressions of survivin and bcl-2.Western blot was used to measure the expressions of bcl-2 and survivin proteins in HaCaT human keratinocytes and SCL-1 human squamous cell carcinoma cells. Results In normal control tissues, there was no expressions of survivin or bcl-2, while in SCC, the expression rates of bcl-2 and survivin were 70% and 60%, respectively,and there was no statistical correlation between the expressions of bcl-2 and survivin (P >0.05). Neither the expression of survivin nor that of bcl-2 was correlated to patients' age, gender or lesional site (all P >0.05). A statistical correlation was observed between the pathological stage in patients and expression of bcl-2 as well as between lymph node metastasis and expression of survivin (both P < 0.05). Western blot analysis revealed a significant increase in the expression of survivin and bcl-2 in SCL-1 cells compared with HaCaT cells. Con-clusion In SCC, survivin and bcl-2 seem to play their roles via different anti-apoptotic pathways.

Objective To investigate the in vitro effect of interferon-γ (IFN-γ) and ATRA on the morphological transition, proliferation of and apoptosis in a human cutaneous squamous cell carcinoma cell line SCL-1. Methods Cultured SCL-1 cells were divided into 6 groups to be treated with ATRA of 1 μmol/L, various concentrations ( 100, 500, 1000 U/ml) of IFN-γ, the combination of ATRA of 1 μmol/L and IFN-y of 1000 U/ml,respectively, or to remain untreated. MTT assay and flow cytometry were performed to evaluate the cell proliferation and apoptosis. The morphological features of apoptotic cells were observed by a transmission electron microscope (TEM) and inverted phase contrast microscope after 1% propidium iodide staining. Results IFN-γ could inhibit the proliferation of SCL-1 cells in a dose-dependent manner, and the most pronounced inhibitory effect was observed at a dose of 1000 U/ml . ATRA and IFN-γ induced an apoptosis in SCL-1 cells, and the early apoptosis rate was 4.84%, 11.96% and 18.71% in SCL-1 cells after treated with ATRA of 1 μmol/L, IFN-γ of 1000 U/ml and their combination, respectively. A series of morphological changes characteristic of apoptosis,such as bipolar changes, were observed in SCL-1 cells treated with ATRA and IFN-γ, with the presence of many early apoptotic cells, which showed a trend towards benign differentiation. Conclusions Within a certain concentration range, IFN-γcan promote the differentiation, but inhibit the proliferation of SCL-1 cells in a dose-dependent manner, and ATRA could enhance the effects of IFN-γ.

Objective To investigate the effects of baicalein and acitretin on the apoptosis in a human cutaneous squamous cell carcinoma cell line, SCL-12. Methods Cultured SCL-12 cells were treated with different concentrations of baicalein (3.125, 6.25, 12.5 μmol/L) and acitretin (2.5, 5.0, 10.0 μ mol/L), alone or in combination, for 48 hours. Subsequently, cell proliferation was detected by MTT assay, and cell apoptosis by ELISA as well as annexin V-FITC and propidium iodide double staining. Real-time quantitative RT-PCR was used to detect the expression of Fas mRNA in SCL-12 cells. Results The cell proliferation of SCL-12 cells was inhibited by baicalein and acitretin alone or in combination. The combination of baicalein and acitretin at the three tested concentrations, except for that of baicalein at 3.125 μmol/L and acitretin at 2.5 μmol/L, more strongly inhibited the proliferation of SCL-12 cells compared with baicalein or acitretin alone, and the inhibitory effect was in a dose-dependent manner. The early apoptosis rate was 9.39% ± 1.52%, 20.86% ± 2.16%,36.85% ± 3.26% in SCL-12 cells treated with baicalein of 3.125 μmol/L, acitretin of 5.0 μmol/L alone and their combination, respectively, significantly higher than that in untreated cells (4.39% ± 0.64%, all P <0.05); the induction of apoptosis in SCL-12 cells by the combination of baicalein and acitretin was stronger than that by baicalein or acitretin alone (F = 138.44, P < 0.05). Baicalein and acitretin alone or in combination significantly increased the mRNA expression of Fas in SCL-12 cells, and the effect of their combination was stronger than that of baicalein or acitretin alone. Conclusions Baicalein and aeitretin could inhibit the growth of and induce the apoptosis in SCL-12 cells, and the effect is enhanced by the combination of baicalein and acitretin, which may be associated with the upregulation of Fas expression in SCL-12 cells.

Objective To analyze the relations between medical students' burnout and some related factors for providing some suggestions for educational practice. Methods A total of 80 medical students were investigated and assessed by organizational justice questionnaire and Maslach Burnout Inventory-General Survey(MBI-GS). Results Some subjects were found to experience job burnout.Means of total distributive justice were significantly lower than medians.Means of participation and complaint mechanism were not discrete to medians.Means of motional exhaustion and cynicism were significantly lower than medians.Means of reduced professional efficacy were significantly higher than medians.Conclusion Job burnout existed among interns from non-211 and 211 Project universities.Medical students should establish scientific view of profession through psychological lessons,lectures,simulated diagnosis,clinical practice and self-sentience.

ObjectiveTo compare the effects of normal saline (NS), 10% hydroxyethyl starch (HES) and hypertonic-hyperoncotic solution (HHS,7.5% NaCl/10% HES) on regional cerebral blood flow (rCBF), brain edema and blood-brain barrier (BBB) in a rat model of traumatic head injury (THI) complicate with hemorrhagic shock. Methods60 SD rats were randomized into 5 groups: sham group (n=12), model group (n=12), NS group (n=12), HES group (n=12) and HHS group (n=12). rCBF and mean arterial pressure (MAP) were determined before and after THI, hemorrhagic shock and resuscitation. Cerebral water content and Evans Blue (EB) content were assessed 3 h after resuscitation.ResultsMAP and rCBF were restored to baseline values immediately after resuscitation in all resuscitated group and began to decrease 15 min, 30 min or 45 min later, respectively(P<0.05). 3 h after resuscitation, the brain water content was higher in NS group than those in sham or HHS group(P<0.05). EB contents of injured hemispheres were higher in model and NS group than those in HES or HHS group(P<0.05). ConclusionSmall-volume resuscitation with HHS can restore MAP and rCBF, decrease brain edema and improve BBB in a rat model of THI complicate with hemorrhagic shock.

Objective To investigate the distribution and antimicrobial resistance profile of the common pathogens isolated during the period from 2009 to 2015.Methods All the bacterial strains isolated from pediatric inpatients in Beijing Children's Hospital during the period from 2009 to 2015 were analyzed. Antimicrobial susceptibility was determined by disk diffusion method and Phoenix 100 Automated Microbiology System. Results were analyzed according to the guidelines of CLSI (2014) using WHONET 5.6 software.Results The total strains were 26630. The most common gram-positive isolates were Streptococcus pneumoniae,Staphylococcusaureusand coagulase-negative Staphylococcus (CNS), while the most frequently isolated gram-negative microorganisms were Klebsiella spp.,Pseudomonas aeruginosa and Escherichia coli. The prevalence of S. pneumoniae was up to 25.7 % (4101/15973) in all respiratory tract specimens. About 50.2 % of the S. pneumoniae isolates were not susceptible to penicillin. The prevalence of methicillin-resistant strains was 20.6 % in S. aureus (MRSA) and 87.8 % in coagulase negative Staphylococcus (MRCNS) on average. The prevalence of MRSA increased from 11.1 % in 2009 to 29.8 % in 2015. No S. pneumoniae or staphylococcal strains were found resistant to vancomycin or linezolid. The Enterococcus strains were still highly susceptible to vancomycin and linezolid. Overall 0.3 % of the Enterococcus faecium isolates were resistant to vancomycin. The extended-spectrum beta-lactamases (ESBLs) producing strains accounted for 71.4 % -78.1 % of E. coli and 65.1 % - 76.9 % of K. pneumoniae isolates. The carbapenem-resistant E. coli and K. pneumoniae were reported for the first time in 2010, but in 2014, the strains resistant to carbapenems had increased to more than 7 % in E. coli, and higher than 20 % in K. pneumoniae. In 2015, up to 27.7 % and 25.7 % of P. aeruginosa isolates were resistant to imipenem and meropenem, respectively, and 59.9 % of the A. baumannii isolates were resistant to imipenem and meropenem. Beta-lactamase was positive in 46.3 % of the H. influenzae isolates. Conclusions MRSA and the carbapenem-resistant strains of E. coli,K. pneumoniae and A. baumannii are still on the rise in pediatric inpatients, which poses a serious threat to clinical practice and implies the importance of strengthening infection control.

Objective To reveal and forecast the incidence trend of Brucellosis, in order to provide acientific basis for future intervention and policy-making. Methods Descriptive epidemiological method was used to analyze and statistically describe the distribution of the disease in different times, different locations and different (7.0783/10 million to 13.1257/10 million) and Qingxu ( 1.4811/10 million to 8.5241/10 million) were higher,followed by Yangqu county(0 to 5.8232/10 million), Xiaodian(0.8108/l0 million to 2.4229/10 million) and Jinyuan district ( 0.5329/ 10 million to 1.5896/10 million), and the remaining counties(districts) in the annual There were 223 cases of Brucellosis patients from 2006 to 2009 in Taiyuan. Vocational high risk population was farmers, with a total of 140 cases, accounting for 62.78% of the total number of incidence, followed by students and workers, respectively, 13, 14 cases, accounting for 5.83% and 6.28%, other occupational groups, 56 cases,77.58%;28 cases aged above 60 years, accounting for 12.56%;22 cases aged younger than 19 years, accounting identical in the four years, most cases occurred in spring and summer and showing a clear seasonal high.Conclusions The incidence trend of Brucellosis is on the rise from 2006 to 2009. High risk population is farmer,and the number of younger patients is on the rise, we propose strengthen protection for high risk groups.