[Objective]To explore the change and its significance of the expression of vascular endothelial growth factor(VEGF) messenger RNA and bone morphogenic protein-2(BMP-2) of the local femoral head in the nontraumatic osteonecrosis of femoral head(NONFH).[Method]Sixteen samples of femoral heads of NONFH were collected as the experimental group and fresh 10 samples of femoral heads of femoral neck fracture as control group,overall examples were collected from total articular replacement arthroplasty.The samples were splitted in coronal plane and get one bone block from necrosis area and another one from healthy area,make them into microtome section after the process of immobility and decalcification.Their pathological change was observed by using optical microscope and electron microscope and detect the expression of BMP-2 and VEGFmRNA in femoral head through making use of immunohistochemistry and in-situ hybridization technique.[Result]The organization structure of experimental group was disorganized,cracked and the bone trabecula was rarefactive and non-intact and there was a great number of empty lacuna in bone trabecula.While there was the reverse situation in the control group.The intensity and area of positive expression of BMP-2 and VEGFmRNA in femoral head of the experimental group were lower than that of control group obviously.The result showed statistical significance(P

AIM: To investigate the phenomenon that miR-let-7d regulates the proliferation and invasion abilities of the lung cancer cells through nuclear receptor peroxisome proliferator-activated receptors γ (PPARγ).METHODS: The relation between PPARγ and microRNA was analyzed by bioinformatics.The plasmid reporter assay was used to verify that PPARγ was the target of miR-let-7d.The lung cancer cell line with low expression of PPARγ was selected from different lung cancer cell lines by Western blot.The regulatory role of miR-let-7d in the lung cancer cells was determined by dual luciferase labeling and Western blot.The effect of miR-let-7d on the proliferation ability of lung cancer cells was detected by colony formation assay, the effect of miR-let-7d on the invasive ability of lung cancer cells was detected by Transwell invasion assay.RESULTS: The results of bioinformatic analysis showed that miR-let-7d regulated the expression of PPARγ, and the 3'UTR of PPARγ contained 2 functional miR-let-7d binding sites, indicating that PPARγ is a direct target of miR-let-7d.miR-let-7d was able to directly regulate the expression of PPARγ at mRNA and protein levels.Transfection of miR-let-7d inhibitor promoted the proliferation and invasion abilities of lung cancer cells by increasing the expression of PPARγ.CONCLUSION: miR-let-7d increases the expression of tumor suppressor PPARγ to inhibit the proliferation and invasive abilities of lung cancer cells.

Objective To make a plan for the backup of electronic medical records. Methods The background of electronic medical records backup was analyzed, and NTBACKUP tool and batch technology were used to realize the backup plan. Results An automatic-execution backup plan raised the security of electronic medical records greatly. Conclusion The automatic-execution backup plan satisfies the basic demands for medical information security, though there is room for further improvement in data synchronization.

Objective To investigate the correlation between flat IVC (fIVC)and relative clinical,index of prolapse of kidney(K) and lordosis of abdominal aorta (A)with respect to the lumbar on supine.Methods Abdominal CT image data of 100 cases without sign of low blood volume were selected randomly.The K and A were calculated in the plane of the entrance of the renal vein and fIVC was defined according to the ratio of length to short diameter of IVC (R)up and down about 1.5 cm plane,which large to 3 ︰ 1.The index size between different groups tested by t,the association of fIVC with age and gender tested byχ2 .Results Among 100 cases, male 57 cases,female 43 cases,fIVC was 14 and 20 cases respectively (χ2 =5.26,P <0.05);The old,middle-aged and young groups were 56,38 and 6 cases respectively,the constituent ratio of fIVC was 44.64%(25/56),23.68%(9/38)and 0(0/6)respectively;The mean of K plus A was 2.57±0.25,2.1 5 ±0.14 and 2.05 ±0.1 1 respectively.The two former of old group was all significantly more than that of green group (χ2 =6.40,t=5.06,P <0.05).The mean of K plus A of fIVC and non-fIVC set was 2.67±0.25 and 2.03±0.18 (t=3.89,P <0.05)respectively.Conclusion The increased K and A on supine perhaps as causes for the formation of fIVC and its more located nearby the entrance of the renal vein,and is associated with age and gender.

Problem-based learning(PBL)brought many changes in the teaching model of medical education.This article explored the clinical application of PBL combined with picture archiving communicate system(PACS)in medical imaging education.Through comparing the results before and after periodic study,PBL was verified to motivate the students'learning interest.Enthusiasm of autonomic learning and problem analysis ability of students increased evidently,which provided a substantial basis for continued learning.

BACKGROUND: It has been confirmed that some casting alloy can inhibit the activity of human gingival fibroblasts in vitro, which can be used for inducing apoptosis of human gingival fibroblasts (HGFs). However, the mechanism of this effect is poorly understood.OBJECTIVE: To investigate the effect of Ni-Cr, Co-Cr, Au and pure Ti ceramic alloys on the expression of P70S6k by HGFs in vitro.DESIGN, TIME AND SETTING: Grouping controlled experiments with the expression of P70s6k by HGFs in each group as observation objects. Experiments were performed at the Institute of Immunohistochemistry and Western blotting, Technology Building of Liaoning Medical University from July to October 2009.MATERIALS: Ni-Cr, Co-Cr, Au and pure Ti ceramic alloys were processed by Shenzhen Mecodent Dental Laboratory Co., Ltd. The gingival from gingival neck of the first premolar (which goes to be extracted due to the need of orthodontic treatment) of teenager who was15 years old without any clinical disease was obtained, followed by the primary culture of HGFs. The fifth passage of cells in logarithmic phase were used to measure indexes.METHODS: Ni-Cr, Co-Cr, Au and pure Ti ceramic alloys were incubated in DMEM to prepare alloy leaching liquor, which were then added in HGF medium at 10% concentration. DMEM containing 10% fetal bovine serum was used in negative controls. MAIN OUTCOME MEASURES: The expression of P70S6k in each group was measured by Western Blotting following 72 hours of intervention with alloy leaching liquor.RESULTS: Western-blot results showed that there was no significant difference in the average gray value of P70S6k expression in Au, pure Ti ceramic alloys and control groups (P > 0.05). There was also no significant difference between Au ceramic alloys and pure Ti ceramic alloys groups or between Ni-Cr ceramic alloys and Co-Cr ceramic alloys groups. (P > 0.05), but Ni-Cr ceramic alloys group or Co-Cr ceramic alloys group showed significant difference compared with the Au, pure Ti ceramic alloys and control groups (P < 0.01).CONCLUSION: Au ceramic alloys and pure Ti ceramic alloys show that they have no obvious effect on the proliferation activity of HGFs. Ni-Cr and Co-Cr ceramic alloys showed an inhibitory effect on the proliferation activity of HGFs.

Clinical Information System(CIS)is a new period of hospital information system(HIS).The construction of CIS can improve doctors and nurses' work.The traditional CIS includes doctor-workstation,PACS,LIS,RIS,etc.By establishing clinical coding system,PASS,online information gathering system and PDA,the information quality and application level of CIS can be elevated.

ObjectiveTo evaluate the myocardium damage of myocardial contrast echocardiography (MCE) and the impact on regional left ventricular mechanics by imaging and pathology techniques.Methods Eleven open-chest animal models of Beagle were employed to collect the short-axis views of mitral annular,papillary muscle and apical level of three complete cardiac cycles using gray-scale imaging at the baseline and blank irradiation 5 min later(transmitting frequency 1.7/3.4 M Hz,mechanical index 1.0).After that,5 ml of SonoVue was gotten a shot by intravenous bolus injection,the heart was exposed by ultrasonic wave for 5 min continuously,and then the same images collected were at the point-in-time irradiation immediately,20 min,40 min and 60 min later.The short-axis circumferential strain and strain rate,radial strain and strain rate were measured and calculated by EchoPAC multi-parameter workstation,meanwhile including conventional of cardiac function.All the dogs were killed after the experiments and the myocardium was harvested for HE staining and observed with transmission electron microscope for the tissue microstructure.Results①Conventional parameters of cardiac function:there was no significant difference before and after MCE in the heart rate,blood pressure,ejection fraction,left ventricular end-systolic volume and end-diastolic volume,stroke volume,cardiac output,mitral flow spectrum prior to the E/A,tissue Doppler mitral annular e/a and E/e ( P ＞0.05).During the whole process of experiment,the dogs’ vital signs were stable.②Compared the segmental circumferential strain and strain rate,radial strain and strain rate between baseline and each treatment groups,these parameters had a trend of increase in most segments,but the difference was not statistically significant in most segments (P ＞0.05).③HE staining at the light microscope demonstrated a small amount of myocardial cell infiltration of inflammatory cells near the outer membrane (21.2％),and very few part of the muscle fibers dissolved and fractured (6.1％).④The section of transmission electron microscope showed all the structures were normal except that a small amount of endothelial cells were mild swelling,some red blood cells were leaked,some myofilaments were regional dissolved,the relevance ratio were 28.6 ％,42.9 ％ and 21.4 ％ respectively,and the abnormal area was less than 10％ of the entire field of vision.ConclusionsMCE has no significant impact for the global function of heart and the regional mechanical state,and furthermore there is no serious pathological damage on the myocardium.

Objective To explore the value of iDose4 iterative reconstruction for coronary CT angiography (CCTA).Methods Totally 124 coronary heart disease patients underwent iDose4 iterative reconstruction and filtered back projection (FBP) reconstruction,of whom,56 ones with BMI not less than 20 kg/m2 were put into No.1 iteration group using 135 kV tube voltage and 68 ones with BMI less than 20 kg/m2 were into No.2 iteration group using 110 kV tube voltage.FBP reconstruction was executed with 110 kV tube voltage.Comparison analyses were carried out on signal noise ratio (SNR),contrast to noise ratio (CNR) and image quality.Results There were significant differences between the values of SNR,radiation dose and image quality in No.1 iteration group and FBP group (P＜0.05).Statistical differences were also found between the values of CNR and radiation dose in No.2 iteration group and FBP group,while there were no obvious differences between the values of SNR and image quality in the above two groups (P＜0.05).Conclusion Low-voltage iDose reconstruction gains advantages in radiation dose and image quality during 64-slice CCTA,and thus is worthy promoting clinically.

Objective To study the targeting ability of aptamer-modified PLGA nanoparticle encapsulated with gold nanorod and liquid perflurocarbon,and observe its mediated ultrasound/photoacoustic dual-modality imaging in vitro.Methods PLGA nanoparticle was prepared using double emulsion technique.Aptamer-modified PLGA nanoparticle was obtained by connecting,then PLGA nanoparticle was conjugated with MUC1 aptamer carbodiimide technique aimed to obtain aptamer-modified PLGA nanoparticle.Targeting ability of aptamer-modified PLGA nanoparticle to MCF-7 tumor cells in vitro was tested by fluorescence microscope.Besides,there were three control groups including PLGA nanoparticle group,aptamer group and HELA cell group.A commercial photoacoustic instrument was used to detect ultrasound/photoacoustic signal.Results A significant number of aptamer-modified PLGA nanoparticles gathered around the MCF-7 cells,however,the specific binding can not be observed in control groups.Both ultrasound and photoacoustic signal intensity of the aptamer-modified PLGA nanoparticles increased significantly when excited with laser.Conclusions The aptamer-modified PLGA nanoparticle was successfully prepared,and had superior targeting ability to MCF-7 cells,Morever,ultrasound/photoacoustic signal emitted the by nanoparticle increased significantly.These properties make the targeted nanoparticle a great potential to become a distinguished uhrasound/photoacoustic dual modality contrast agent,which lays good foundation for further targeted imaging application in vivo.