Objective To investigate the molecular mechanism of Helicobacter pylori (H.pylori) resistance to clarithromycin. Methods The E test was used to determine clarithromycin resistant strains of H.pylori , and PCR Restriction Fragment Length Polymorphism (RFLP) analysis for 23S rRNA domain V gene mutations. Results Of nine clarithromycin resistant stains of H.pylori , including six primary and three acquired resistant strains, eight were found to have an A to G mutation in 23S rRNA domain V at position 2144. Conclusions The results indicated that the majority (88.8%) of clarithromycin resistant isolates of H.pylori in Shanghai have an A2144G mutation in 23S rRNA domain V.

Objective To investigate whether a novel mucosal adjuvant (DNA containing six base pair motifs consisting of an unmethylated CpG dinucleotide flanked by two 5′ purines and two 3′ pyrimidines, CpG Oligodeoxynucleotide, CpG ODN),which has not been shown to have significant toxicity,could be an ideal mucosal adjuvant for the development of a H. pylori vaccine in mice model. Methods C57BL/6 mice were orally or intranasally immunized with H. pylori whole cell sonicate(WCS) / cholera toxin (CT) or WCS /CpG ODN, and the corresponding control groups were set. Mice were dosed once a week for four weeks. One week after the last immunization, all animals were challenged by live H. pylori (5?10 8) three times in a five day duration. Two and 8 weeks after the last challenge, all animals were sacrificed to examine infection of H. pylori. Sera, saliva, gastric juice were collected to measure the concentrations of IgG, IgG1, IgG2a and IgA by ELISA. Results The protecting rates against H. pylori infection were 75%(9/12), 70% (7/10) and 0 (0/10) in the group of WCS/CT orally, WCS/CpG ODN intranasally and WCS/CpG ODN orally, respectively. Significantly higher levels of serum IgG2a antibody was found in the group immunized with WCS plus CpG ODN than those found in the sham immunized controls ( P

Objectives:To evaluate lung injury mechanism in SD rat with nitrogen dioxide(NO2) exposure. 　Methods:In the test-control study, pulmonary malondialdehyde(MDA),glutathione(GSH) and total-antioxidant content(T-AOC) were determined in 10 SD rats with long-term NO2 exposure,10 SD rats with short-term NO2 exposure and 10 SD rats with fresh air as control. 　Results: Pulmonary MDA content was increased and T-AOC was decreased significantly in SD rat exposed to NO2. Pulmonary GSH was decreased significantly in long-term NO2 exposure group as compared with short-term NO2 exposure group and control group. 　Conclusions: Imbalance between oxidant and antioxidant was an important mechanism in the pathogenesis of oxidizing lung injury in SD rat with NO2 exposure.

OBJECTIVE: To provide references for the improvement of drug recall system in China.METHODS: The problems existing in the drug recall system in China were analyzed through a comparison of the drug recall system between China and Australia.RESULTS & CONCLUSIONS: China should draw useful experiences from Australia to improve its drug recall system by perfecting the legal system and tracking measures,determining stratified drugs and the responsibilities of government etc.

Objectives: To analyze the strategies of the diagnosis and treatment in patients with the pulmonary infection after renal transplantation. Methods: A retrospective analysis was made on 28 cases of pulmonary infections among 285 patients undergoing renal transplantation. Results: The morbidity of pulmonary infection was 9.82%(28/285). The majority pathogens of pulmonary infection in this study were pseudomonas, staphylococcus epidermidis, canadida and cytomegalovirus. Chest X ray was important in the diagnosis, but there was no specificity to determine the pathogens. The mortality in 28 pulmonary infection patients was 32.1%(9/28). Most of the patients suffered from pulmonary infection within 4 months after the operation, and the postoperative period from 2 months to 4 months was a high risk time window for death caused by pulmonary infections. Conclusions: The morbidity and mortality of pulmonary infections, especially severe pneumonia, in patients with renal transplantation, are higher than healthy people. Treatment following clinical epidemiology and strategy of microbiology play a very important role to reduce the mortality in those patients.

Objective To investigate changes of coagulation function in patients with high altitude polycythemia (HAPC) .Meth‐ods Activated partial thromboplastin time (APTT) ,prothrombin time (PT) ,thrombin time (TT) and fibrinogen (Fbg) were de‐tected and compared between 69 patients with HAPC and 60 healthy subjects (controls) .Results Fbg ,APTT and TT levels in pa‐tients with HAPC were higher than controls (P<0 .05) ,while the difference of PT was not significant (P>0 .05) .Dynamic obser‐vation indicated that comprehensive therapy could these recover coagulation function .Conclusion Hemorrhage and coagulation process in patients with HAPC could be very complicated ,including physiological adaptation and the process of physiology evolving into pathology .

OBJECTIVETo observe application value of multispectral animal living imaging technology in rats model of osteoarthritis.

METHODSFifteen male SD rats weighed (180 +/- 20) g (3 months old) were received intra-articular injection of iodoacetic acid for establishing osteoarthritis. Articular cavity of left knee of rats were injected into 50 microl iodoacetic acid. The same volume of sterile saline was injected into right knee articular cavity as control. X-ray living imaging and bone mineral density were observed at 2 and 4 weeks after establishment of model. After 4 weeks,rats were sacrificed and their bilateral joints were collected and determined histologically based on Collins classification and Kellgren-Lawrence classification.

RESULTSOsteoarthritis model was successfully established, compared with control group, model group showed typical manifestation of osteoarthritis, including irregular cartilage surface,osteophyte formation,joint deformity and cartilage defect,and combined with significant decrease of bone density (P < 0.01), while the decrease was not obvious in proximal tibia (P < 0.05). After 2 weeks, knee joints in model group was classified as Collins grade 1 and Kellgren-Lawrence grade 2,then classified as Collins grade 4 and Kellgren-Lawrence grade 3 after 4 weeks,control group showed smooth articular surface,normal joint space and intact cartilage surface, knee joints was classified as Collins and Kellgren-Lawrence grade 0, and bone density of distal femur and proximal tibia were normal.

CONCLUSIONMultispectral animal living imaging technology could be used in dynamic observation of living imaging and detection of bone density in the animal model of osteoarthritis, and it is significant for evaluation of osteoarthritis model, and its realted tesearch.

Animals ; Bone Density ; Disease Models, Animal ; Humans ; Knee Joint ; diagnostic imaging ; Male ; Osteoarthritis ; diagnosis ; diagnostic imaging ; physiopathology ; Radiography ; Rats ; Rats, Sprague-Dawley

OBJECTIVETo compare the differences between computer aided identification and ultra-thin layer slicing in measuring the lesions of femoral head necrosis,and to confirm the accuracy and practicability of computer aided method.

METHODSFrom June 2012 to December 2013, the X-ray and MRI of 24 patients (24 hips on unilateral) were reviewed, who had avascular necrosis of the femoral head (ANFA) at late stage (stage III and IV) according to the ARCO international staging system. There were 15 males and 9 females, with an average age of (65.1 ± 8.8) years old, ranged 33 to 74 years old. Based on the software system with seeds point identification, the ragional adaptive search method with computer aid was used to calculate the volume of necrotic lesion in femoral on MRI. Then the pathological slices of those intraoperative femoral heads were made to measure the gross volume of necrotic lesion in femoral head,and the values were compared with the data in the computer.

RESULTSFor 24 hips, by the calculation of computer, the necrotic volume was (20.00 ± 3.04) cm (ranged, 18.72 to 21.29 cm³). Under the pathological section, the necrotic volume of the femoral head was (19.89 ± 3.17) cm³ (ranged, 18.55 to 21.23 cm³). In computer and pathology two kinds of measurement, the two entire femoral head volume had no significant difference using these two measurements (t = -1.227, P = 0.232).

CONCLUSIONComputer aided identification for necrotic area of femoral head adaptive can demonstrate the morphology of femoral head necrosis accurately and reliably, which will help surgeon better understand the morphology and orientation in femoral head.

Adult ; Aged ; Diagnosis, Computer-Assisted ; Female ; Femur Head Necrosis ; pathology ; Humans ; Magnetic Resonance Imaging ; Male ; Middle Aged

This article, introduces setting up of reflectance confocal microscope which is divided into four parts: optical system, scanning system, detecting system and software controlling system. This reflectance confocal microscope realizes in vivo epidermis tissue imaging in mouse skin as well as disease diagnosis related cell parameters measurement.
Animals ; Diagnostic Imaging ; instrumentation ; methods ; Microscopy, Confocal ; methods ; Rats ; Skin ; Software

Dietary Proteins ; administration & dosage ; Energy Intake ; Female ; Hospitalization ; Humans ; Infant, Newborn ; Infant, Very Low Birth Weight ; Logistic Models ; Male ; Parenteral Nutrition ; Weight Gain