Objective Network emulation system constructs a virtual network environment which has the characteristics of controllable and repeatable network conditions. This makes it possible to predict the availability and performance of new protocols and algorithms before deploying to Internet. Methods PARNEM, a parallel discrete event network emulation system described in this paper has the following characteristics: ① BREEN - a BSP based real-time event scheduling engine; ② application transparent flexible interactive mechanism; ③ legacy network model reuse. Conclusion PARNEM allows detailed and accurate study of application behavior. Comprehensive case studies covering bottleneck bandwidth measurement and distributed cooperative web caching system demonstrate that network emulation technology opens a wide range of new opportunities for examining the behavior of applications.

AIM:To investigate the protective effect of nerve growth factor combined with Ginkgo biloba extract on retinal ischemia-reperfusion (RIR) injury in rabbits with experimental high intraocular pressure.METHODS:Establishment of rabbit glaucoma ischemia reperfusion model.Twenty-four New Zealand white rabbits were randomly divided into three groups:nerve growth factor group, Ginkgo biloba extract group and combination group.Respectively, in the continuous administration of 1, 7, 14d.We observed the morphological changes of the tissues of the retina.The levels of superoxide dismutase(SOD), nitric oxide(NO) and malondialdehyde(MDA) in retinal tissue were measured.RESULTS:Respectively, first, in the continuous administration of 1, 7, 14d, the contents of MDA and NO in Ginkgo biloba extract group and nerve growth group were higher than that in combination group (P<0.05).Secondly, the SOD content of Ginkgo biloba extract group and nerve growth group were lower than that of combination group at each time point (P<0.05).At each time point, the number of HE staining of retinal ganglion cells (RGCs) showed that the loss of RGCs in the combination group was significantly lower than that in the other groups, and the ganglion cell count showed that the Ginkgo biloba extract group and the neuronal growth group were lower (P<0.05).CONCLUSION:Nerve growth factor combined with Ginkgo biloba extract has better protective effect on retinal ischemia-reperfusion injury.The mechanism may be related to the decrease of free radicals and increase the activity of SOD in retinal tissue.

Humans ; Hyoid Bone ; pathology ; Male ; Middle Aged ; Syndrome

Objective Through the two D-dimer content detection of the fracture patients and healthy con-trols,and analyze the difference between them ,to explore the correlation between fractures were detected two D-dimer and the importance and the patient′s condition.Methods 306 of fracture patients were collected for determination of D-dimer content were detected at the same time ,100 healthy people as control two D-dimer content;analysis of the correlation between the fracture in 306 cases patients with D-dimer content .Results The plasma D-dimer level of pa-tients with two fracture(10.7 ±2.6)mg/L,which was significantly higher than that of healthy subjects (0.3 ±0.1) mg/L(t=11.07,P<0.01);The fracture number,fracture patients plasma D-dimer detection results content is high-er,the more serious condition .Conclusion The plasma D-dimer level was significantly higher in patients with two fractures,coagulation Stata ,fibrinolytic enhancement ,easily lead to venous thrombosis and disseminated intravascular coagulation in patients with more complications such as fracture;fracture,the higher the content of plasma D-dimer, patients with more serious ,there is correlation .

Objective: To study the feasibility of closed and three-dimensional reconstruction of maxillary defects with titanium mesh and free forearm flap. Methods: Maxillary defects, 3 of type Ⅱ and 7 of type Ⅲ, due to tumor or trauma were closely reconstructed with titanium mesh to restore the profile of maxilla and with radial flap to close the oral and the nasal wound surfaces following total maxillectomy (in 3 cases) and subtotal maxillectomy(in 7 cases). Results: 10 cases were followed up for 3～18 months. All the flaps were alive. The maxilla nasal and oral cavity were restored in all the cases and denture was applied in 3 cases. No neoplasm were fond by CT. Mouth opening was 2.5～4.0cm. Epithelium on the surface of the titanium mesh was found by nasopharyngoscope in 2 cases. Conclusion: The closed and three-dimensional reconstruction of maxillary defect with titanium mesh and free forearm flap can restore the shape and the function of maxilla.

Objective To study the epidemiological characters and risk factors of nephrolithiasis in an island area,Putuo district, Zhoushan city.Methods With stratified cluster random sampling method,5 915 residents aged above 15 yrs and resided 5 yrs and above in Putuo district,Zhoushan city were selected,and surveyed with Ultrasound examination and questionnaire.X~2 tendency test and non-condition Logistic regression were conducted by means of SPSS software.Results After single factor analysis and Multi- factor analysis,the factors entered the model finally were sex(OR=0.543,95%CI:0.454~0.649),education status(OR=1.253,95%CI: 1.151～1.364),dietary habit(OR=0.882,95%CI:0.823～0.944),BMI(OR=1.274,95%CI:1.142～0.1.421),urinary tract infection(OR= 2.126,95%CI:1.663～2.718).Conclusion Risk factors for nephrolithiasis include dietary habit,education status,and urinary tract infection.The vegetables are the protection factor.

Objective To observe the changes of intracerebral amino acid transmitters in the periventricular leukomalacia (PVL) of newborn rats with microdialysis and so as to explore the role of excitotoxicity in PVL.Methods Replicated the model for PVL at the age of postnatal day 5 (P5) by intracerebral injection of 3-nitropropionic acid (3-NPA).Before injection of 3-NPA,and 15 min,30 min,45 min,60 min,75 min,90 min after injection of 3-NPA,collected the sample of extracellular fluid (ECF) at the corpus callosum above the left ventricle through microdialysis,respectively.After microdialysis,the experimental rats were allowed to survive to P6-P14,and then they were killed and the brains were prepared for HE stain.The amino accids of dialysate were quantified through high performance liquid chromatography(HPLC),and then the excitotoxic index (EI) was calculated.Results Fifteen min to 45 min after injection of 3-NPA,the concentrations of glumate (Glu) and aspartic acid (Asp) of ECF elevated significantly,and then returned to the normal levels.Fifteen min to 75 min and 15 min to 30 min after injection of 3-NPA,the concentrations of glycine (Gly) and GABA significantly elevated,respectively,and returned to normal levels at 90 min and 45 min after injection of 3-NPA,respectively.But the EI,which indicated the balance of excitatory amino acids(EAAs) and inhibitory amno aciols(IAAs),significantly elevated 15 min to 75 min after injection of 3-NPA,then retured to normal level after 90 min.Sub-cortical and periventricular white matter rarefaction and significant lateral ventricle enlargement were observed in HE staining.Conclusions Changes of intracerebral amino acid transmitters in the PVL of newborn rats show regularity:EAAs,IAAs of ECF and EI elavate in the early stage,and then return to the normal level quickly.It indicates that excitotoxicity play a great role in PVL,especially at the early stage.Therefore,the preventions of PVL must be executed at the early stage.

Objective To compare the cardiac function parameters in gated SPECT determined by filtered back projection (FBP) and OSEM reconstruction methods. Methods One hundred and forty-four patients underwent 99Tcm-MIBI gated-SPECT imaging studies. The parameters LVEF, EDV and ESV, were derived using quantitative gated SPECT (QGS), four-dimensional model SPECT (4D-MSPECT) and emory cardiac toolbox (ECToolbox) softwares. Each image was reconstructed by FBP or OSEM. Bland-Altman analysis and paired t-test were applied to evaluate those parameters. Results Correlation coefficients for LVEF, EDV and ESV between FBP and OSEM methods were all more than 0.93 (all P<0.001). EDV calculated by FBP was lower than that by OSEM using QGS software, but became the opposite when using 4D-MSPECT and ECToolbox softwares. (QGS: (82.2±39.1) ml vs (83.5±40.8) ml, t=-2.53, P<0.05; 4D-MSPECT: (93.5±46.9) ml vs (88.8±45.2) ml, t=5.95, P<0.01; ECToolbox: (106.4±51.1) ml vs (100.8±49.0) ml, t=3.99, P<0.01). ESV calculated by FBP was higher than that by OSEM using 4D-MSPECT software (4D-MSPECT:(37.5±41.4) ml vs (34.8±37.6) ml, t=3.92, P<0.01). LVEF calculated by FBP was lower than that by OSEM using QGS software ((62.1±16.9)% vs (63.1±16.1)%, t=-3.14, P<0.05), but higher than that by OSEM using ECToolbox software ((74.1±18.8)% vs (71.3±17.1)%, t=5.28, P<0.01). Conclusion Generally, cardiac functional parameters based on FBP and OSEM construction methods correlated well, although they might have singnificantly different results.

Female ; Humans ; Infant, Low Birth Weight ; Infant, Newborn ; Infant, Premature ; Periodontitis ; complications ; physiopathology ; Pregnancy ; Pregnancy Complications, Infectious ; physiopathology ; Pregnancy Outcome

Acute Kidney Injury ; chemically induced ; Child ; Humans ; Male ; Methotrexate ; administration & dosage ; adverse effects ; Precursor Cell Lymphoblastic Leukemia-Lymphoma ; drug therapy