Rapid detection of Listeria monocytogenes by immunomagnetic separation combined with selective medium / 生物工程学报

Listeria monocytogenes is a pathogenic bacterium, therefore, it is essential for food safety monitoring to establish a rapid and specific detecting method. In this study, immunomagnetic beads and selective medium were combined to detect Listeria monocytogenes at different concentrations (10(1)-10(5) CFU/mL). Other three types of Listeria spp., Staphylococcus aureus and Vibrio parahaemolyticus were also detected to conduct the cross-reaction analysis. Meanwhile, contaminated milk samples were prepared to explore the limit of detection of immunomagnetic beads combining with selective medium. Results showed that Listeria monocytogenes with the concentration of 10(3) CFU/mL and above was successfully detected. Milk samples were detected within 6 hours, with a detection limit of 0.7 CFU/mL. The method developed is capable of detecting milk samples within 30 h, which is 38 h faster compared with national standard method with the same sensitivity.

Posterior internal fixation and bone grafting fusion for atlantoaxial fracture or dislocation / 中国矫形外科杂志

[Objective]To evaluate the method and curative effect of posterior internal fixation and bone grafting fusion for atlantoaxial fracture or dislocation.[Method]Posterior internal fixation and bone grafting fusion were made on 26 patients with atlantoaxial fracture or dislocation in condition of tracheal intubation anesthesia.Occipitocervieal fixation(Aixs) and bone grafting fusion were performed on patients with fracture of vertebral lamina-arch.Vertebral lamina splint fixation (Apofix) was performed on patients without fracture of vertebral lamina-arch and decompression of vertebral canal.[Result]Followed up for 5 to 60 months(averaged,16.8 months),the vertebral artery and spinal cord injury were not occurred and clinical symptom was relieved in all patients.X ray examination showed screws in vertebral articular process and occipital condyle were normotopic without laxation and fragmentation.The bone grafting transformed into osseous fusion after 3 months.[Conclusion]Aixs fixation and bone grafting fusion and Apofix fixation are effective methods for atlantoaxial fracture or dislocation.

IMMEDIATE REPAIRING OF THE BONE DEFECT OF FEMUR SHAFT WITH ILIAC BONE GRAFTING WITH MUSCLE PEDICLE OR VASCULAR PEDICLE / 中华显微外科杂志

Objective:To repair the bone defect from gunshot wounds immediately with iliac bone graft with muscle pedicle or vascular pedicle.Methods:Fifteen bone defects of femur shaft from gunshot wounds of 15 patients have been repaired immediately with iliac bone graft with sartorius mus- cle pedicle or ascending branch of lateral femoral circumflex artery pedicle since 1985.There were 13 male patients and 2 female patients with an age range of 18 to 50.Of the 15 fractured,12 were classified as Winquis-Hansen type Ⅲ and 3 were type Ⅳ.Results:All of the patients were followed up for a period of 3 to 24 months and had a excellent bone union.The mean time to bone union was 16 weeks.The mo- tion range of knee was 100 to 132;with an average of 125.Conclusion:Iliac bone graft with sartorius muscle pedile or ascending branch of lateral femoral circumflex artery pedicle could be resected easi- ly.The vascularized iliac bone with independent blood supplies filled up the defected area of bone and improved the blood supplies of the local regions,thus accelerating bone union.