Diamond-like carbon(DLC)films age characterized by hish wear resistance,low friction coefficients and chemical inertness,and thus hish-corrosion resistance.The properties of DLC can further be modified by incorporating other elements in the films,such as N,F,AS,and so on,to adjust them for specific applications.These properties make the films good candidates as biocompatible coatings for biomedical devices and implants.The review gives an overview of the biomedical chagacteristics of diamond-like carbon films and their potential apphcafions.

BACKGROUND:In recent years, many scholars adopted a joint non-fusion and fusion spinal fixation for multisegmental cervical spondylotic myelopathy, and achieved good clinical results. However, long-term clinical efficacy and possible related complications also require long-term fol ow-up of more in-depth study.
OBJECTIVE:To review the research and application progress of anterior fusion and non-fusion fixation surgical operation for cervical myelopathy.
METHODS:Computer-based search was conducted in China Journal Ful-text Database and PubMed database by the first author for articles related to anterior fusion and non-fusion fixation surgical operation for cervical myelopathy published between January 2004 and January 2014. The key words were“implant material;cervical spondylotic myelopathy;anterior;surgery;fusion;non-fusion;progress;hybrid;summary”in Chinese and“implant material;cervical spondylotic myelopathy;anterior;surgery/operation;fusion;non-fusion;research progress;hybrid;summary”in English. Final y, 35 articles were included for review.
RESULTS AND CONCLUSION:Fusion and non-fusion fixation methods for cervical spondylotic myelopathy had their own advantages. From the view point of indications, the non-fusion fixation was relatively limited. Currently, the fusion fixation was stil the main method in treatment of cervical myelopathy. Non-fusion method as an emerging fixation method also achieved good short-period results, but it needs a long fol ow-up study. Hybrid fixation integrates the advantages of both methods, and can reduce the pressure. Simultaneously, Hybrid fixation also can reduce fusion segments, and retain the range-of-motion of the cervical spine as much as possible. Hybrid fixation becomes a hot topic in recent studies. However, most current researches on Hybrid fixation are retrospective study, lack of control. The overal fol ow-up time is short. Thus, Hybrid fixation needs to be researched more deeply.

Objective To discuss the clinical manifestations and the morphological features of intracranial arteriovenous malformation (AVM) in childhood. Methods During the period from Jan. 2012 to June 2013, a total of 14 AVM patients under the age of 14 years were admitted to authors’ hospital. Of the 14 patients, 11 had a history of spontaneous intracerebral hemorrhage (78.6%), 7 complained of headache (50.5% ), 5 showed signs of unilateral limb weakness (35.7% ), and 2 was accompanied with epileptic attacks (14.3% ). The clinical characteristics, the preoperative imaging features and DSA findings were retrospectively analyzed. Results DSA showed that terminal feeding branches were visualized in 9 cases and blood supply from perforating branches was seen in the remaining 5 cases. In seven cases the feeding artery was single, while in the remaining 7 cases the feeding artery was multiple, and in four of them combination blood supply from both anterior and posterior circulation was found. The lesions were situated at the lateral or convex surface of cerebral hemisphere (n = 5), lateral ventricle (n = 4), cerebral bottom (n = 3) or medial surface of cerebral hemisphere (n = 2). The lesion’s diameter was < 30 mm in 10 cases and (30 -60) mm in 4 cases. According to Spetzler- Martin grading, grade Ⅰ was seen in 4 cases, grade Ⅱ in 2 cases, grade Ⅲ in 5 cases and grade Ⅳ in 3 cases. Conclusion Although in childhood AVM lesion is small in size and lower in grading, its onset is early and the lesion is prone to bleeding. DSA findings indicate that most AVMs in childhood take the form of immature type. Nevertheless, its natural course needs to be further studied.

Through the comparative study on the psychiatric specialist training system between China, Japan and Korea, we have found that the number of psychiatric specialist training base in Japan and Korea is more than that of our country. Japan has a higher requirement of the practice training experiences for trainees before training and emphasizes how well mastering general psychiatry and understanding of society as trainees. However, the training bases in South Korean have main hos-pitals and sub main hospitals as well and trainees are stipulated to participate in a certain number of academic conferences and publish academic papers as their characteristics, which can provide a refer-ence for our country's adding more additional psychiatric specialist training bases and reasonable arrangements for trainee rotation in the future.

AIM: To observe the growthinhibiting cell cycle-modifying and apoptosis-inducing effects of satraplatin on human ovarian carcinoma cell line A2780, and to explore its possible mechanism. METHODS: The effect of satraplatin on A2780 cells proliferation was determined using MTT, and the change in cell cycle was analyzed using PI staining. Morphologic change was visualized by fluorescence and electron microscopy. AnnexinV-FITC/PI staining multiparameter flow cytometry and immuno- histochemical TUNEL assay were used to detect apoptotic cells. The activity of caspase-3 and the effect of pan-caspase inhibitor on cell viability were measured as well. RESULTS: The growthinhibiting and apoptosis-inducing effects of satraplatin were dose-dependent and similar to those of cisplatin. Satraplatin mainly caused A2780 cell accumulation in S phase accompanied by minor accumulation in G2/M phase. Cells treated with satraplatin exhibited typical morphology of apoptosis. Satraplatin-induced increase in caspase-3 activity of A2780 cells was concentration-dependent. The viability of A2780 cells was affected by pan-caspase inhibitor z-VAD-fmk in a dose-dependent manner under certain concentration of z-VAD-fmk. CONCLUSION: Satraplatin-induced apoptosis in A2780 in vitro was observed. Caspase-dependent and independent pathways were involved in apoptosis induced by satraplatin, and the latter included caspase-3 dependent and non-caspase-3 dependent pathways.

Objective To explore the application value of tissue dispersion quantitative analysis in rat liver fibrosis stages and provide a reference for clinical non-invasive diagnosis of liver fibrosis.Methods Seventy-two male Wistar rats were randomly divided into experimental group (n =64) and control group (n =8).The experimental groups of rats were gavaged with the volume fraction of 60％ CCl4 olive oil solution to form different stages of liver fibrosis,the control group did wvith normal saline,All the rat underwent tissue dispersion quantitative analysis to obtain 12 elastic parameters,the differences in above parameters were compared among rats with different liver fibrosis stages,then the correlation with pathological stages were analyzed.Results Except for COMP,ASM,CORR,there were significant differences in all parameters among rats of different liver fibrosis (P ＜0.05),which were correlated with pathological stages(P ＜0.05).Among these parameters,％ AREA had the highest correlation coefficient (r =0.891,P =0.001).The ROC curve was made by ％AREA to estimate the fibrosis stage.the area under ROC curve for ％ AREA was 0.914 (≥ the control group + S0),0.963 (≥early liver fibrosis S1 + S2),0.969 (≥middle liver fibrosis S3),0.948 (early cirrhosis S4),respectively.Conclusions The technique of tissue dispersion quantitative analysis has a good evaluation value for liver fibrosis stages,it is able to provide a preliminary reference for clinical non-invasive diagnosis of liver fibrosis.

Objective To evaluate PBL teaching results in medical virology experiment course. Methods Medical students of class 2011 were randomized assigned into PBL group (n=45, 20 five-academic-year students and 25 seven-academic year students) and control group (n=63, 38 five-academic-year students and 25 seven-academic year students). Teaching effectiveness was evaluated by scores of experiment, medical virology examination and final examination. PBL group was surveyed with questionnaire. SPSS statistical software was used and t test was employed to do analysis. Results Scores in medical virology examination were higher in seven-academic-year students in PBL group than in control group and there was no difference in other two examination scores between the two groups. Survey showed that interest motivation, case analysis, experiment design and knowledge grasp-ing in PBL group were highly satisfied. However, evidence-based and generalization ability among seven-academic-year students as well as autonomous learning ability and ability to deduce material among five-academic-year students were not completed satisfied. Conclusions PBL with public health events in medical virology experiment course can develop students' intrinsic motivation, knowledge grasping and public health awareness. However, PBL methods should be adjusted to suit different academic students.

Objective To investigate the feasibility of magnetic resonance diffusion tensor imaging (DTI) as a noninvasive way for assessment of kidney transplant function in the early posttransplantation period.Method Fifty-one kidney transplant recipients less than 1 month after kidney transplantation and 26 age-matched healthy volunteers were included and examined using a fatsaturated echo-planar DTI sequence in oblique-coronal orientation at 3.0 Tesla magnetic resonance (MR) imager (diffusion directions=6,b =0,300 s/mm2).According to the estimated glomerular filtration rate (eGFR) recorded and calculated on the examined day,all subjects were divided into four groups:group 1,healthy volunteers (n =26) ; group 2,eGFR≥60 mL/min/1.73 m2 (n =24) ; group 3,30≤eGFR＜60 mL/min/1.73 m2 (n =19) ; group 4,eGFR＜30 mL/min/1.73 m2 (n =8).Mean apparent diffusion coefficient (ADC) and mean fractional anisotropy (FA) were determined separately for the cortex and the medulla.The paired Students t test was used to compare ADC and FA between cortex and medulla within each group.ADC and FA between groups were compared by using the one-way analysis of variance test.Relationship between ADC and FA with eGFR of the transplants was assessed by using Pearson correlation analysis.Result Mean cortical FA was significantly higher in group 1 than in other three groups (P＜0.01 for all),while differences among groups of allograft recipients were not significant (P＞0.05 for all).There was a gradually decreasing trend of medullary FA and ADC,and cortical ADC from group 2 to group 4,and the differences among groups were all pronounced (P＜0.05 for all).In renal allografts,there was a significant positive correlation between eGFR and medullary FA,medullary ADC as well as cortical ADC (r =0.812,0.756,0.757,respectively,P＜0.01).The cortical-medullary discrimination of FA-map and ADC-map in group 3 and group 4 apparently decreased.Meanwhile,DTI revealed that the radial diffusion tracts in the medulla of group 3 and group 4 obviously broke off and reduced,especially in group 4.Conclusion DTI is a promising way to evaluate kidney transplant function early after transplantion,and can quantitatively and visually distinguish transplants with different functions.

Objective To explore the hospitalization costs of patients with diabetic foot ulcer and analyze key influencing factors.Methods A total of 570 diabetic foot inpatients were recruited from January 2008 to March 2012 for analysis of the relationship between their hospitalization costs and clinical symptoms.The multifactor regression analysis model was used to identify main influencing factors for their hospitalization costs.Results The medical costs of such inpatients amounted to 1 9 825.6 yuan (12 476.6~32 745.9)yuan,while average hospitalization costs of the 3 401 diabetic patients admitted over the same period were but 9 757.1 yuan (6 282.1 ~ 1 5 723.7 )yuan,a difference of statistic significance.The single-factor analysis found statistical differences from the differences of hospitalization among various age,occupation,dorsal artery of foot,B ultrasound of lower extremity arteries,wagner classification,amputation,transfer,leucocyte,hemoglobin,serum albumin,serum creatinine and high density lipoprotein.Multifactor analysis found that the significant factors influencing the medical costs of inpatients were days of stay,albumin,wagner classification,dorsal artery of foot,leucocyte and age. Conclusion Hypoalbuminemia,high stage of wagner classification,weak or absent pulsation of foot dorsal artery,severe infection and aging were significant factors contributing to higher medical costs of hospitalization for patients with diabetic foot ulcer.

Objective To systematically evaluate the diagnostic value of magnetic resonance cholangiopancreatography (MRCP) in the investigation of bile duct anatomy of liver transplantation living donors.Methods A search in Cochrane library,MEDLINE,EMBASE,CBMdisc (China Biology Medicine disc) was performed to identify relevant English and Chinese-language abstracts,supplemented by Springer,OVID,Sciencedirect full text database,etc.Criteria for inclusion were based on validity criteria for diagnostic research published by the Cochrane collaboration.With Meta analysis package for Stata10.1,heterogeneity of the included articles was tested,which was used to select proper effect model to calculate pooled weighted sensitivity and specificity,positive likelihood ratio,negative likelihood ratio. Summary receiver operating characteristic (SROC) curve was performed and the area under the curve (AUC) was calculated. Finally,sensitivity analysis was performed.Results Seventeen articles with 34 studies were included.Heterogeneity analysis revealed heterogeneity between studies and the source was MRCP imaging methods spotted by meta-regression analysis. Subgroup analysis according to MRCP imaging methods showed homogeneity within subgroups.The pooled sensitivity,specificity,positive likelihood ratio,negative likelihood ratio,diagnostic odd ratio of breath-holding thick slice MRCP,3D MRCP,the combination of the prior two methods,contrast enhance MRCP were 0.89,0.78,4.1,0.14,29; 0.92,0.80,4.5,0.10,45;0.95,0.82,5.2,0.06,85; and 1.00,0.76,4.1,0,1228,respectively with fixed effect model analysis.The area under the SROC curve was 0.83,0.92,0.96 and 0.99 respectively.Conclusion The combination of thick slice and 3D MRCP is a practical and effective method with good sensitivity and specificity to investigate bile duct anatomy of living liver transplantation donors,which fully meets the requirements of the preoperative assessment of bile duct structure.