Objective To use numerical simulation for analying hemodynamic changes in intracranial aneurysm with elastic wall, and to analyze the effect of mechanical properties of the aneurysm wall on the hemodynamic changes. Methods Based on the DSA images of a patient with multi-intracranial aneurysm, the numerical simulation of the hemodynamics of the elastic intracinal aneurysm was processed using a software of finite element method of computational fluid dynamics (CFD) and the computational fluid-structure interaction analyses. We also investigated the effect of the coupling of hemodynamics and aneurysm wall movement. Results The morphology of the elastic aneurysm underwent deformation, and the angle between aneurysm and parent artery also changed, affecting the inflow jet dispersed into the flow field of aneurysm and the distribution of wall shear stress on the surface of aneurysm. Conclusion The numerical simulation of CFD can directly reflect the hemodynamic characteristics of aneurysms. More accurate elastic wall aneurysm model is needed to improve the quantitative analysis of the hemodynamics of intracranial aneurysms.

Cochlear Implantation ; Cochlear Implants ; Humans ; Vestibulocochlear Nerve Diseases

Objective To observe the effect of botulinum toxin A (BTX-A) on spasticity of upper extremity with different functional status after stroke.Methods 32 post-stroke patents with upper extremity spasticity were divided into the good function group (n=13) and poor function group (n=19) according to the function of upper extremity. All patients in two groups were treated with injection of domestic BTX-A at the biceps brachii and rehabilitation therapy. The efficacy was assessed with rang of motion, Modified Ashowrth Scale (MAS), Fugl-Meyer Assessment (FMA) and Mot-FIM upper extremity before and 8-week after treatment.Results After treatment, the rang of motion and FMA scores of patients in two groups improved ( P<0.05), but the good function group was superior to the poor function group; the scores of MAS of two groups were not different ( P>0.05); the scores of Mot-FIM upper extremity of the patients in two groups increased ( P<0.05), and there was no significant difference between two groups ( P>0.05).Conclusion The effect of BTX-A injection at the biceps brachii on post-stroke patients with good function of upper extremity is superior to the patients with poor function of upper extremity.

Objective To explore early diagnostic methods for ulnar impaction syndrome on the basis of suggested criteria.Methods From December 1998 to December 2004,123 cases complained of ulnar pain.They were checked and diagnosed according to the criteria of Yu-dong Gu,and especially,the results of wrist MRL Forty-eight of them were diagnosed as ulnar impactinn syndrome.A retrospective study was done to analyze the char- acteristies of X-ray and MRI in examining ulnar impaction syndrome,clinical symptoms of the wrist,and the association between Chun & Palmer's scoring systems and imaging manifestations.Results Most of the cases of ulnar impaction syndrome had positive lunar variance (68.8%).Carpal avascular necrosis was found in about 27.1% of the cases through X-ray examination of the wrist,64.7% of whom were lunar osteonecrosis.Abnormal changes in signal intensity occurred in the MRI findings of the syndrome cases.The carpal necrosis was always located at the ulnar side of lunare or (and) at the waist and bottom of triquetrum.There was a close relationship between clinical symptoms and Chun & Palmer's grading systems and carpal imaging,MRI in particular Conclusion Early diagnosis of ulnar impaction syndrome can be made easily on the basis of deep understanding of the syndrome,clinical symptoms,and findings of imaging,especially MRI.

Some types of bacteria swim through rotating their flagella. The swimming mechanism of bacteria during flagella bundling and tumble process is analyzed. The effects of body rotation and flagellum′s polymorphic transitions on bundling processes and the wall effect phenomenon are also discussed. Finally, based on dynamics similarity, a new microrobot module is put forward to further studying the flagella swimming phenomena. The research would be very helpful for constructing the bionic swimming robots under the low Reynolds number.

Anesthesia, General ; Animals ; Central Venous Pressure ; physiology ; Heart Function Tests ; Hemodynamics ; physiology ; Respiration, Artificial ; Shock, Septic ; pathology ; Swine ; physiology ; Venae Cavae ; physiology

OBJECTIVE: To extract sperm DNA from mixed stain by the modified differential lysis method combined with silicon bead method and to evaluate its application value. METHODS: Fifty-two mixed stains containing female STR genotypes detected by differential lysis method were collected. The sperm DNA was extracted by the modified method combined with silicon bead method, then genotyped with the Identifiler Kit, and compared with the results of genotyping by the conventional differential lysis method as control. RESULTS: Of the 52 samples, 38 samples with sole male STR genotypes in all loci were detected. The detection rate of male STR genotypes was 98.08% through the modified method combined with silicon bead method. CONCLUSION The modified differential lysis method combined with silicon bead method can be used in extraction of sperm DNA from mixed stain.
DNA/isolation & purification* ; DNA Fingerprinting ; Female ; Genotype ; Humans ; Male ; Polymerase Chain Reaction ; Silicon ; Spermatozoa

BACKGROUND: Preliminary study has proven that adult human bone marrow-derived mesenchymal stem cells (MSCs) suppress peripheral blood lymphocytes proliferation.But the mechanism was still to be investigated.OBJECTIVE: To study the negatively regulatory effect of adult human MSCs on allogeneic lymphocyte proliferation by cell-free condition.DESIGN,TIME AND SETTING: Cytological observation in vitro,which was performed in the Lanzhou General Hospital,Lanzhou Military Area Command of Chinese PLA between October 2005 and December 2007.MATERIALS: The bone marrow sample was provided by the allo-transplantation donor.The peripheral blood lymphocytes were provided by the healthy volunteer.METHODS: Adult human MSCs were separated with Percoll + adherence method.Allogeneic peripheral blood lymphocytes were obtained from healthy donors with Ficoll solution and the cell concentration was adjusted as 2×109/L for use.100μ L MSCs culture supernatant was taken out in 96-well plates.The groups were following: A superuatant + 3-day MSCs culture media (100 μ L/well); B superuatant + phytohemagglutini (PHA; 1 g/L,5 μ L); C medium + LG-DMEM culture media containing 10% fetal bovine serum (100 μ L); D medium + PHA (1 g/L,5 μ L).The cells were incubated at 37 ℃ with 5% CO2 in a fully humidified atmosphere for three days.MAIN OUTCOME MEASURES: Effect of MSCs supematant on proliferation and transformation of variant lymphocytes.RESULTS: Peripheral blood lymphocytes proliferation was suppressed as compared with the blank control group and PHA group after MSCs culture,and the inhibition ratio was 9.00% (P ＜ 0.05).When lymphocytes were stimulated by PHA,the suppression effects were even stronger and the inhibition ratio was 20.91% (P ＜ 0.01).CONCLUSION: Adult human MSCs supernatant can suppress peripheral blood lymphocytes proliferation and transformation; furthermore,PHA can enhance the inhibitory effect,suggesting the negative regulation is at least in part due to indirectly inhibiting lymphocytes via soluble cytokines.

Objective To examine expression of PTEN gene in ovarian cancer cisplatin-sensitive cell line OV2008 cells and cisplatin-resistant cell line C13K cells,and evaluate the effect of wild-type PTEN gene on reversing cisplatin-resistance of C13K cells and underlying mechanisms.Methods The expression of PTEN mRNA and protein in OV2008 and C13K cells were detected by semi-quantitative RT-PCR and western blot.Recombinant eukaryotic expression plasmid containing human wild-type PTEN gene was transfected into C13K cells by lipofectamine 2000.The expression of PTEN mRNA was monitored by RT- PCR and the expression of PTEN,protein kinase B(AKT),phospho-AKT(p-AKT)protein were analyzed by western blot in PTEN transfected and untransfected C13K cells.Proliferation and chemosensitivity of cells to cisplatin were measured by methyl thiazolyl tetrazolium(MTT),and cell apoptosis was detected by flow cytometry after treatment with cisplatin.Results(1)The expression of PTEN mRNA and protein(1.02 ?0.05,1.02?0.07)in OV2008 cells were significantly higher than those in C13K cells,which were 0.45 ?0.03 and 0.55?0.03 respectively(P

Objective To investigate the influence of motor impersistence on functional recovery and prog- nosis of patients with left hemiplegia. Methods A total of 64 in-patients with left side hemiplegia who were able to understand the oral instructions were assigned into a motor impersistence group (n = 31 ) and a control group (n = 34) , respectively, according to the assessment with Scale of Motor Impersistence developed by Joynt. Both groups were comparable in terms of the basic clinical characteristic and motor function of patients except motor impersis- tence. The conventional rehabilitation training programs were adopted for all patients in this study. Brunnstrom func- tional category, Ueda Satoshi hemiplegic finger function assessment scale, upper limb function assessment scale, Berg balance scale, Functional ambulatory category, Modified Barthel Index were employed to evaluate the subjects before and after 1 and 2 months of treatment, with regard to the motor function of their upper limbs, walking ability, activities of daily living performance and balance ability. Results After 1 month of treatment, the patients in the M1 group were significantly improved with regard to the motor function of upper limbs, hand function, standing ba- lance and activity of daily living performance( P0.05 ) , while those in the control group were improved with all the parameters except the lower limb function. After 2 months of treatment, patients in both groups were all significantly improved ( P