BACKGROUND:Chitosan and gelatin have good biocompatibility and biodegradable properties.More and more attentions have been given to the application of the composite membrane of chitosan/hydroxyapatite(HA)and gelatin/HA as the tissue scaffolds.OBJECTIVE:To prepare a biocompatible composite membrane of chitosan/HA/gelatin having nanometer multilayer HA,and to investigate whether such a membrane might be a candidate of the tissue scaffolds for the bond repair and regeneration,DESIGN:Controlled observation.SETTING:College of Chemistry and Environmental Engineering,Jianghan UniversityMATERIALS:The experiments were performed at the Laboratory of Fine Chemistry,College of Chemistry and Environmental Engineering,Jianghan University from February to August 2007.Chitosan (Yuhnan Ocean Biochemistry Co.,Ltd,Zhengjiang,China,Mw 13.44×104,93% degree of deacetylation),and gelation(provided by Shanghai Chemical Reagent Co.,Shanghai,China)were used in the present study.METHODS:The mixture chitosan/CaCl2 solution was casted on a glass plate to give the membrane of chitosan/CaCl2.Then,the membrane was soaked in KH2PO4 solution,0.1 mol/L NaOH solution,and 3 wt% gelatin aqueous solution,respectively.The resulted membrane was washed and dried to obtain the chtiosan/HA/gelatin composite membrane.The morphological observation of the composite membrane and HA crystal were carded on a scanning electron microscope.The mechanical properties of the composite membrane were measured using the universal testing machine.The tensile strength(σb)and the elongation at break (ε)were calculated.The thermal stability of composite membrane was determined using a WCT-2C thermobalance.MAIN OUTCOME MEASURES:The morphologies,the mechanical properties,and the thermal stability of the composite membrane and HA crystal were observed.RESULTS:The multilayer HA crystal with 400 nm thickness in the composite membrane was observed.The tensile strength(σb)and the elongation at break(ε)of the composite membrane were 3.83-10.25 MPa and 3.97%-10.14%,respectively.The decomposition temperature of HA-treated membrane was 310℃,which was higher than that of chitosan/gelatin membrane(305℃).CONCLUSION:The composite chitosan/HA/gelatin membrane was prepared by using chitosan/CaCl2,KH2PO4 and gelatin solutions.Such a biocompatible composite membrane with multilayer HA might be a promising tissue scaffold.

Chronic obstructive pulmonary disease(COPD) is a chronic inflammatory disease characterized by infiltration of T-lymphocytes,which plays a key role in the immune response of human.Exploration on the characters of immune response in the pathologic process related to COPD may be useful to explore the mechenism of immunity response in COPD patients,thus,contrubute to improve the knowledge of COPD and investigating new avenues of treatment.

Objective:To evaluate the mid-term follow-up results of arteriovenous graft(AVG) for patients on maintenance hemodialysis.Methods:The clinical data of 131 patients who implanted AVG from Jan 2014 to Dec 2016 at Department of Vascular Surgery, Nanfang Hospital, Southern Medical University were retrospectively analyzed.Results:The mean follow-up time was 22.8 months (ranging from 2 to 61 months). The average primary patency time after AVG was (22.20±1.97) months, and the primary patency rates at 1 year, 2 years, 3 years were 61.5%, 36.6% and 23.2%, respectively. The average secondary patency time after AVG was (38.30±2.30) months, and the secondary patency rates after 1 year, 2 years, 3 years were 85.6%, 68.6%, and 55.8%, respectively. Sixty five (49.6%) patients had thrombosis after operations, 50(38.2%) had access stenosis, 13(9.9%) had graft infections, and 2(1.5%) had pseudoaneurysm, 2(1.5%) had hemodialysis access-induced distal ischemia, 2(1.5%) had seroma.Conclusions:Though the primary patency rate of AVG is worse than that of arteriovenous fistula (AVF), a satisfactory secondary patency rate can be achieved through repair treatments. Regular follow-up, early detection of stenotic lesions and treatments are vital for long-term patency of AVG.

Objective: To isolate and identify the phenolic constituents with anti-oxidant and anti-α-glucosidase activities from the methanol extract in the twigs of Acer rubrum. Methods: The twigs of A. rubrum were extracted by methanol then partitioned by system solvents with different polarity. The ethyl acetate extract was separated on silica gel, Sephadex LH-20, ODS columns, and by semi-preparative HPLC. The isolated compounds were identified by physicochemical properties and spectral analyses. The DPPH free radical scavenging and anti-α-glucosidase activities of the compounds were also evaluated. Results: Ten phenolic compounds were isolated and purified from the twigs of A. rubrum and were identified as catechin (1), epicatechin (2), epicatechin-3-O-gallate (3), quercetin-3-O-α-L-rhamnoside (4), quercetin-3-O-3″-galloyl-rhamnoside (5), quercetin-3-O-2″-galloyl-rhamnoside (6), phloridzin (7), ginnalin A (8), ginnalin B (9), and ginnalin C (10). Conclusion: Compounds 3 and 5-7 are isolated from the twigs of A. rubrum for the first time. Compound 7 is the only one chalcone isolated from the plants in Aceraceae for the first time. All of the compounds show the good anti-oxidant activities. Compounds 3 and 8 show the strong anti-α-glucosidase activities.

Child ; Child, Preschool ; Humans ; Male ; Posterior Leukoencephalopathy Syndrome

Brain Diseases ; complications ; microbiology ; mortality ; Fatal Outcome ; Female ; Humans ; Middle Aged ; Otitis Externa ; complications ; microbiology ; mortality ; Pseudomonas Infections ; complications ; mortality

Adult ; Aged ; Antineoplastic Combined Chemotherapy Protocols ; therapeutic use ; Carcinoma, Non-Small-Cell Lung ; diagnostic imaging ; drug therapy ; Female ; Fluorodeoxyglucose F18 ; Humans ; Lung Neoplasms ; diagnostic imaging ; drug therapy ; Male ; Middle Aged ; Positron-Emission Tomography ; Small Cell Lung Carcinoma ; diagnostic imaging ; drug therapy ; Tomography, X-Ray Computed

Dacryocystorhinostomy ; Endoscopy ; Humans ; Nose

Objective To observe the therapeutic effects of UPASS-Ⅱ minimally invasive spinal system percutaneous pedicle screws internal fixation treating thoracolumbar fracture .Methods From May 2011 to December 2012 ,26 patients(observing group) were sufferred from thoracolumbar fracture without neural impairment were treated with UPASS-Ⅱ minimally invasive spinal sys-tem percutaneous pedicle screws internal fixation ,and were compared with other 26 cases(control group) adopted the treatment of conventional open pedicle screws internal fixation in the same period .Results All patients were followed up more than 6 months (mean 9 .2 months) ,the comparison of Cobb′s angle ,anterior vertebra height ,VAS ,JOA score and ODI between pre and post oper-ation were all significantly different in both group(P<0 .01) ,but the operation time and length of stay in the hospital in observing group were significantly shorter than that in control group (P<0 .05) ,moreover ,the amount of operative bleeding and drainage of post operation in observing group decreased obviously than that in control group (P<0 .01) .Conclusion This study shows that UPASS-Ⅱ minimally invasive spinal system percutaneous pedicle screw internal fixation treating thoraco-lumbar fracture is a safe and effective treatment strategy in selected patients .

objective: To evaluate the effects of the pendulum appliance on arch length, arch width, overbite and overjet. Methods: Pendulum appliances were applied for distalization of maxillary molars in 37 patients whith class Ⅱ malocclusion and 1-Ⅱ degree crowded dentition in upper dental arch. Pretreatment and posttreatment model analysis was conducted. Results: 37 patients treated for 18.2?4.5 weeks with pendulum appliance were accomplished . The increase of arch arc length between the maxillary first molars was (17.36?4.38) mm, the decrease of anterior arch width (-3.04?1.59) mm, and the decrease of posterior arch width (-1.29?2.01) mm . Differences between the pretreatment and posttreatment were significant, including arch arc length between the maxillary first molars ( P