As a novel functional material with great application values, magnetic nanobead has been in fast development in recent years. Magnetic nanobead is provided with characteristics of beth polymeric and mag-netic particles, so it can be detected easily fi'om the medium and can be easily located since they can move di-rectionally when motivated by external electric field. The magnetic nanobead is widely used in biomedical engi-neering research due to its unique physical and chemical properties which simplify the complex experiments op-erations and shorten the testing period.

Objective To explore the effects and mechanisms of urokinase-type plasminogen activator (uPA) on high glucose-induced rat mesangial cells proliferation and phenotype transformation. Methods Rat mesangial cells were cultured and incubated in media containing either 5 mmol/L D-glucose or 30 mmol/L D-glucose with or without addition of wortmannin, or uPA (105 U/L) for different time periods. At the end of the incubation period, mesangial cells proliferation was assessed by MTT assay and flow cytometric analysis. Cyclin-dependent kinase 2 (CDK2) and p27kip1 expression and activation of Akt were evaluated by Western blotting and Akt kinase assay respectively. Furthermore, the expression and distribution of α-SMA were detected with laser confocal microscopy. Results MTT assay and flow cytometric analysis demonstrated that high glucose induced mesangial cells proliferation (P＜0.05) and an incresed proportion of cells in G2/M+S stage after 24 h incubation (P＜0.01), which were attenuated by uPA or wortmannin (P＜0.01). High glucose induced the enhance of Akt activity after 3 h (P＜0.05), and the effect was inhibited by wortmannin or uPA (P＜0.01). High glucose did not alter CDK2 expression (P＞0.05),but significantly inhibited p27kip1 expression (P＜0.05), which was attenuated by wortmannin or uPA (P＜0.01). High glucose induced the up-regulation of α-SMA expression and perinucleus location in mesangial cells after 24 h (P＜0.01), which were alleviated by wortmannin or uPA (P＜0.01). Conclusion uPA up-regulates p27kip1 expression and counteracts high glucose-induced mesangial cells proliferation and phenotype transformation via blocking PI3K-Akt signaling pathway.

Objective To evaluate the effects of rehabilitation training on muscle strength and exercise toleranee in hemodialysis patients with muscle atrophy.Methods Nine hemodialysis patients with muscle atrophy because of end renal failure were recruited in this study. A structured exercise program(90 minutes a sedssion.3 sessions a week)was administered to all the subjects for 6 month.Immediately before and at the end of the exercise programme,the muscle strength of the lower limbs,the motor conduction velocity of the peroneal nerve and maximal oxygen consumption of the patients were examined. Results It was shown that all the patients had impaired exercise capacity,weakend muscle strength and slowed nerve conduction velocity before rehabilitation training.After the exercise programme,the patients' exercise capacity as reflected by the maximal oxygen consumption and exercise time was significantly increased.The muscle strength and the motor nerve conduction velocity were significantly increased.Conclusions Muscle atrophy in hemodialysis patients results in poor exercise tolerance, but rehabilitation exercise programme improves amyotrophy and therefore has beneficial effects on the patient's overall work performance.

Objective To observe the clinical efficacy of point injection at Xialiao point (BL 34) for levator ani syndrome. Methods A hundred levator ani syndrome patients were randomly allocated to a treatment group and a control group, 50 cases each. The treatment group received point injection at Xialiao point (BL 34) and the control group was intervened by biofeedback therapy. The Visual Analogue Scale (VAS), component scores of the MOS 36-item Short-From Health Survey (SF-36), anal resting and squeeze pressures were recorded in the two groups before and after the treatment. The therapeutic effects and therapy costs were compared between the two groups.Results The VAS, component scores of SF-36, anal resting and squeeze pressures were significantly changed after intervention in the two groups (P<0.05). After treatment, the VAS, a part of the SF-36 score [physiological function (PF), body pain (BP), vitality (VT) and social function (SF) scores], anal resting and squeeze pressures in the treatment group were significantly different from that in the control group (P<0.05). The total efficacy rate was 88.0% in the treatment group versus 80.0% in the control group, and the difference was statistically significant (P<0.05). The therapy costs in the treatment group were (327.31±13.42) RMB and (408.45±21.56) RMB in the control group, and the difference was statistically significant (P<0.01).Conclusions Point injection at Xialiao point (BL 34) is an effective method for levator ani syndrome.

ObjectiveTo assess the effects and safety of glycoprotein Ⅱ b/Ⅲ a receptor inhibitors tirofiban( intracoronary administration and venous maintenance) combined with DIVERTM CE thrombus-aspiration catheter in the percutaneous coronary intervention (PCI)-treated patients with acute ST-segment elevation myocardial infarction (ST-EMI).Methods Sixty patients with ST-EMI who underwent PCI were randomized into two groups.Thirty-two patients in group A were treated with tirofiban,twenty-eight patients in group B were treated with tirofiban and thrombus-aspiration catheter.Between two groups,the thrombolysis in myocardial infarction (TIMI) risk score,hemorrhagic complications,and incidence of major adverse cardiovascular events (MACE) were compared.ResultsThe TIMI flow was improved in both groups,and it was better in group B than group A ( P ＜ 0.05 ).The incidence of MACE in group B was lower than group A (25.0％ vs 3.6％,P ＜0.05). No fatal hemorrhagic complications were found in both groups.ConclusionsApplication of tirofiban and DIVERTM CE thrombus-aspiration catheter is safe and effective in ST-EMI patients,which can greatly improve myocardial reperfusion and reduce incidence of MACE.

Rosai-Dorfman disease in nasal cavity and nasal sinuses is known as an idiopathic proliferative disease of histiocytes with a distinct morphologic feature and is very rare. It is easy to relapse and be misdiagnosed. In on case, the infiltrating histiocytes had large round or oval nuclei. The cytoplasm was abundant, granular or vacuolated and foamy. Immunohistochemical studies showed that the histiocytes were strongly reactive with antibodies against S100 and CD68. The diagnosis of extranodal RDD in the paranasal sinuses could be differentiated with rhinoscleroma, eosinophilic granuloma, plasmacytoma, or fibrous histiocytoma. It showed that the identification of the distinctive histiocytes which are typically immunoreactive to S100 and CD68 can be quite helpful for correct diagnosis.
Adult ; Histiocytosis, Sinus ; pathology ; Humans ; Male ; Nasal Cavity ; pathology ; Paranasal Sinuses ; pathology

As a novel BioChip technique, LiquiChip technique uses fluorescent polystyrene beads as the carrriers of various probes, thus the related reactions of bio-molecules are in liquid system. LiquiChip technique is of use in the methods to detect bio-macromolecules, e. g. DNA detection, immunoassay, cytokine assay, hormone assay, environmental survey and analysis. In comparison to conventional biochip, LiquiChip presents the advantages of high-throughput, high sensitivity, high accuracy, fine repeatability, wide linear range, etc. Now LiquiChip technique is widely used in biomedical engineering field.
Animals ; Biomedical Engineering ; trends ; Biosensing Techniques ; methods ; Humans ; Microfluidic Analytical Techniques ; methods ; Molecular Imprinting ; Protein Array Analysis ; methods

A cidithiobacillus ferrooxidans is a chemolithotrophic microorganism capable of using ferrous ions and sulphides as energy sources. This microorganism has an important role in the bioleaching of minerals. During this process, the bacteria are normally subjected to several stressing conditions, such as temperature changes, lack of nutrients or pH changes, which may affect the efficiency of the bacterial action. SELDI is a recent technology that allows for high-throughput proteomics studies. The Protein Chip SELDI technology was used to generate comparative protein profiles of A c idithiobacillus ferrooxidans grown under phosphate starvation or normal condition additionally adding Fe2+ as energy resource. There were 13 significantly differential expressed protein's peaks found by using SELDI Protein Chip technologies, which made a solid foundation for further isolation these low molecular proteins by adopting technologies such as HPLC etc.

Objective To explore the clinicopathological features, diagnosis and therapy for pancreatic mutinous noncystic adenocareinoma(MNAC). Methods Eleven MNAC cases treated in our hospital were studied retrospectively. The clinical and pathologic data were reviewed. Results Of the 11 patients, 6 were male and 5 were female. The age ranged from 47 to 76 years with average of 60. 5 years.The main complains included upper abdominal discomfort in 8 cases, abdominal mass in 1 case and jaundice in 2 cases. CA199 serum test was positive in all patients and 5-fold high above normal value in 6 cases. The preoperative radiography of MNAC was usually not specific. Tumors located in the head in 5 cases and in the body and tail of the pancreas in 6 cases. The diameter of the tumor was 4 - 11 cm with average of 6. 5 cm.All cases underwent operation, with radical resection in 2 cases. Liver or abdominal metastasis was found in 5 cases. Postoperative immunohistochemistry showed that MUC-1 was negative in all patients. MUC-2,PCNA and Ki-67 were positive in all patients. All 9 cases that were followed-up died within 5 -22 months,with an average survival time of 10 months. Conclusions The diagnosis of MNAC depends on pathology. Its prognosis is poor.

Objective To evaluate the application of MSCT perfusion imaging (PI)in diagnosing solitary pulmonary nodule (SPN).Methods 60 patients with SPN diagnosed by pathology were divided into two groups.Study group (SG)included 32 patients with lung cancer,and control group (CG)included 28 patients with benign nodules.The patients of two groups underwent 64-slice spiral CT PI and routine contrast-enhanced scan (ES).PI parameters were compared between SG and CG.The diagnosis value of PI was compared with that of ES.Results Compared with CG,SG had markedly higher BV,BF,PS and lower MTT (all P <0.01).Compared with ES, PI was more sensitive in detecting lung cancer and had a higher accuracy in diagnosing SPN (P <0.01).Conclusion MSCT PI plays an important role in diagnosing SPN.