An efficient method is provided to detect simultaneously some important veterinary drugs from different classes in highly complex animal tissue matrix.This method using matrix solid-phase dispersion (MSPD) and high performance liquid chromatography (HPLC) with diode array detection (DAD) is developed to effectively determine two fluoroquinolones (enoxacin and lomefloxacin),two sulfonamides (sulfanilamide and sulfamethoxazole) and one tetracycline (tetracycline) simultaneously in porcine tissues.In the process,MSPD methodology was used to treat samples,washed by n-hexane to remove lipid,eluted the analytes with acetonitrile-dichloromethane (1∶1,v/v).Solvent acetonitrile and solvent acetic acid (0.1％) were combined in a gradient.HPLC-DAD analysis of the tissue samples was performed within 15min at a flow rate of 1.0mL/min.The results showed that a recovery at 0.1,0.5 and 1.0 μg/g fortification levels ranged from 80.6％ to 99.2％ with satisfactory relative standard deviations (RSDs) (below 6.1％.n=3) and the limits of quantitation (LOQ) ranged from 7 μg/kg to 34 μg/kg in porcine tissues.Utilization of the method in successfully simultaneous analysis of porcine tissue incurred with veterinary drug multiresidues is described.

Given the limited sources of autogenic tendon and the difficulties of the tissue engineering tendon to clinical application, the allograft tendon transplantation was a good way for tendon repairing defects. The domestic and foreign scholars have done a lot of studies on the acquisition, preservation, immunological characteristics, clinical application and prognosis of allograft tendon transplantation technology. The allograft tendon transplantation has been more and more used to repair the tendon tissue defects, but there still were some problems to be solved, such as the preservation, immunological characteristics, mechanical strength and postoperative adhesions.

AIM: To analyze and screen humoral bioactive factors associated with accelerated fracture healing after traumatic brain injury. METHODS: A computer-based online search of Chinese Journal Full-text Database and Pubmed database was undertaken to identify related articles. After the first trial, only articles about the effect of humor changes after brain trauma or humoral factors on fracture healing were selected, and those published in recent five years and published in a authoritative journal were preferred. Repetitive research was excluded. RESULTS: Fracture healing can be accelerated, especially for people with traumatic brain injury. Brain injury, spinal cord injury, different parts of the spinal cord injury, and nerve injury have different influences on fracture healing. There are cell active factors in humour of patients after traumatic brain injury, which can induce karyogenetic division and proliferation of bone marrow-derived stroma cells. Bone morphogenetic protein (BMP) is a very important factor in fracture healing, but it seems not one of factors that are associated with accelerated healing mechanism. Transforming growth factor-? (TGF-?) is correlated with brain injury and bone healing. It is likely to be one of cell factors that can promote fracture healing. Basic fibroblast growth factor (bFGF) has an early expression in traumatic brain injury patients, which can promote osteoblast by stimulating vascular endothelial growth factor (VEGF) and TGF-? expressions. VEGF is only a member of various factors in the network in fracture healing. The action mechanism of single factor needs further exploration. Growth hormone has a high concentration in patients with traumatic brain injury, and can promote fracture healing through interaction with insulin-like growth factor. However, the mechanism is still uncertain. Nerve growth factor, prolactin and melantonin concentration significantly change after traumatic brain injury. They may be the humoral factors that influence bone healing, but the mechanism has not yet been identified. CONCLUSION: Accelerated fracture healing associated with traumatic brain injury is influenced by systemic and local bioactive factors. Currently, the researches about the association of some humoral factors such as BMP, TGF-? and bFGF with fracture healing have been conducted, but others need to further study.

AIM:The aim of this study was to observe and compare the therapy effect of different kinds of embryonic stem cells(ESCs) on pulmonary injury of mice exposed to bleomycin.These embryonic stem cells were C57BL/6J-ESC,S8-ESC and human-ESC.METHODS:(1) Fifty C57BL/6J female mice were divided randomly into five groups,which were blank control group,bleomycin model group,bleomycin model injected with C57BL/6J-ESC group,bleomycin model with S8-ESC group and bleomycin model with human ESC group.Every group has ten mice.(2) The mice of control group were administrated 0.9% sodium chloride solution and the mice in other four groups were administrated bleomycin intratracheally.Three different kinds of ESCs were administrated to the mice in three different ESCs-treated groups respectively one hour after bleomycin exposure.The life-span and hydrocyproline concentration were examined.The pathologic changes of the lung and the engraftment of the ESCs in the injured lung were observed.RESULTS:(1) The death rate in three different ESCs-treated groups declined much more obviously than that in the control group on 8 days after bleomycin exposure(bleomycin model group 50%,C57BL/6J-ESC group 37.5%,S8-ESC group 20%,human-ESC group 20%).(2) The extent of pathologic changes of the lung in S8-ESC group was lighter significantly than that in the bleomycin model group,but in C57BL/6J-ESC group and human-ESC group,their pathologic changes were similar to that in bleomycin model group.(3) The hydrocyproline concentration in S8-ESC group was lower distinctly than that in bleomycin model group(P0.05).(4) The positive signals of three kinds of ESCs could be found in the lung at 1,3,12 and 24 hours after the stem cells were administrated,but signals were the strongest 3 hours after stem cells were given.All of the signals disappeared three days later.CONCLUSION:S8-ESCs transplantation can improve the tolerence of mice to bleomycin and ameliorate acute lung injury.

A rapid method has been developed based on the sample preparation procedure named as QuEChERS （Quick, Easy, Cheap, Effective, Rugged and Safe）, combined with reversed-phase high performance liquid chromatography with fluorescence detector and C18 column after precolumn derivatization using o-phthalaldehyde and 2-mercaptoethanol to determine dopamine in porcine muscle. Methanol and deionized water （0.1% acetic acid, v/v） with a ratio of 60：40 was used as mobile phase. The flow rate was 0.8 mL/min and dopamine was eluted within 15 min. The linearity range was 0.003-8 μg/mL with r=0.9992. The detection limit for dopamine was 4 μg/kg and the quantification limit was 9 μg/kg. Recovery studies were carried out at 0.1, 0.5 and 1.0 mg/kg fortification levels and the average recoveries obtained ranged from 90.4% to 98.2% with relative standard deviations between 3.5% and 8.1%. The method was found to be suitable for detection of dopamine in animal product tissues at the maximum residue level.

A rapid method has been developed based on the sample preparation procedure named as QuEChERS (Quick,Easy,Cheap,Effective,Rugged and Safe),combined with reversed-phase high performance liquid chromatography with fluorescence detector and C18 column after precolumn derivatization using o-phthalaldehyde and 2-mercaptoethanol to determine dopamine in porcine muscle.Methanol and deionized water (0.1％ acetic acid,v/v) with a ratio of 60∶40 was used as mobile phase.The flow rate was 0.8 mL/min and dopamine was eluted within 15 min.The linearity range was 0.003-8 μg/mL with r=0.9992.The detection limit for dopamine was 4 μg/kg and the quantification limit was 9 μg/kg.Recovery studies were carried out at 0.1,0.5 and 1.0 mg/kg fortification levels and the average recoveries obtained ranged from 90.4％ to 98.2％ with relative standard deviations between 3.5％ and 8.1％.The method was found to be suitable for detection of dopamine in animal product tissues at the maximum residue level.

Objective To study the effect of intratracheal anti-tumor necrosis factor-α antibody(TNF-αAb)on ultra-structure of lung after cardiopulmonary bypass(CPB).Method 28 healthy rabbits were selected and randomly evenly divided into four groups:I group only received open chest operation;Ⅱ-Ⅳ groups underwent CPB.In the IV group,rabbit TNF-α Ab (2400 ps/kg)Was dropped into the intracheal tube before operation and just after releasing the aortic clamp.Saline was given to the Ⅲ group by the same way.Water volume,TNF-α mRNA,TNF-α protein,apoptosis and pathomorphological changes were measured in the lung tissues.Results TNF-α Ab can re-duce releasing of TNF-α.It could also reduce the occurrence of apeptosis and attenuate pathomorphological changes in the lung tissue.Conclusion Intratracheal TNF-α Ab markedly lessenes the injury of nltrastructure of lung after CPB.

purpose To investigate the release properties of gatifloxacin in situ pH-sensitive gel in vitro.Methods The improved paddle method and the membraneless model were applied in assessing the drug release behavior.Results The gel erosion and drug release were increased with the increase of surface area and shaking frequency.The cumulative quantities of gel erosion were well correlated with the cumulative release of drug loaded in the gel.Conclusion Gatifloxacin was released from in situ pH-sensitive gel with zero-order kinetics characters,and drug release was mainly controlled by gel erosion.

Hierarchical medical system is a high priority in China ’s health reform,bearing significant impacts on remolding of its healthcare system,in which tertiary public hospitals must redefine its role.Five strategies have been proposed as follows:the first is internal management;The second is high-tech;Third is paring assistance;Fourth is telemedicine;Fifth is better medical conditions.