Nitric oxide(NO) is a kind of gas with the character of free radical,taking part in the generation,development and metastasis of the tumor.On the one hand,NO kills the tumor via macrophage and endothelial cells.On the other hand,NO accelerates the growth of tumor by promoting the growth of blood vessels and increasing the blood flow. Further study of NO will bring the hope of exploring the generation and development of tumors, and finding the new methods of treatment.

Objective:To investigate the anatomy of mandibular incisors using microcomputed tomography(Micro-CT).Methods:62 extracted mandibular incisors were selected from dental clinic and observed by Micro-CT.The anatomy of the teeth was analyzed. Results:83.9% of mandibular incisors had a single canal,72.6% had no accessory canal.The location of the apical foramen varied considerably.The mean distance from the root apex to the major lateral apical foramen was (0.613 ±0.298)mm.Of the canals the bucco-lingual diameter were greater than the mesio-distal diameters and the root bucco-lingual canal tapers were greater than the me-sio-distal.Conclusion:The morphology data of mandibular incisors were obtained using Micro-CT.

Objective To explore the death risk factors of preterm infants with respiratory distress syndrome (RDS).Methods A retrospective analysis of 66 preterm infants with severe RDS,who admitted to our NICU between January 2010 and December 2011.The patients were divided into the death group and survival group according to the ending.Results There were a total of 24 cases died (36.36％).The death group's mechanical ventilation time,the median of base excess,the minimum median of pH,PaO2/FiO2,average gestational age,average birth weight,1 minute Apgar score and 5 minute Apgar score were all lower than those of survival group (P ＜ 0.05).In death group,the median duration of FiO2 ＞ 60％,intrauterine distress,polyembryony,sore for neonatal acute physiology perinatal extension version Ⅱ (SNAPPE-Ⅱ) score were all higher than those of survival group (P ＜ 0.05),but the mechanical ventilation complications had no difference between the two groups (P ＞ 0.05).Further Logistic regression analysis showed that independent risk factors were birth weight,1 minute Apgar score and SNAPPE-Ⅱ score,OR were 0.990,0.141 and 1.240 respectively.Receiver operating characteristic analysis of the ability of SNAPPE-Ⅱ score predicting death risk showed the area under curve was 0.86,the difference was statistically significant compared with 0.5 (P =0.000).Death risk prediction showed that the demarcation point SNAPPE-Ⅱ score =24.50 corresponded to the maximum (Youden index =0.70) correct prediction effect.Condusion Independent risk factors of died from severe RDS are birth weight,1 minute Apgar score and SNAPPE-Ⅱ scores; SNAPPE-Ⅱ score predicts risk of death from severe RDS accuracy is medium,equal to 24.50 is the best accuracy to the death risk prediction.

The present study deals with the histochemistry of intramural plexus in stomach, duodenum, ileum, caecum, proximal colon, distal colon and rectum of normal adult guinea pig, including the reaction of Mg~(++)-ATPase, Ca~(++)-ATPase, CCO, SDH, G6PDH, carbohydrate, protein, nucleic acid and lipid in the enteric neurons. The reactions of all the enzymes mentioned above are observed under the light microscope and estimated semiquantitatively, among which, Mg~(++)-ATPase and Ca~(++)-ATPase are measured quantitatively with microphotometer (Leitz MPV II). Both results of light microscope, and microphotometer were analysed statistically. It was found that the above mentioned enzyme activities in the enteric neurons, suggesting that the neurons carry out active metabolism with these concerned enzymes. There were significant differences in some enzyme activities between myenteric plexus and submucous plexus, the former showed higher activity in SDH, while the latter in LDH, G6PDH, and two kinds of ATPase. It is suggested that there are some differences in. the major metabolic manner of carbohydrate, energy metabolism and functional activity between, two plexus. Besides, there were marked difference in enzyme activities among myenteric plexus of different part of digestive tract, the highest activity was showed in duodenum and proximal colon, the lowest was in caecum. These results indicate that enteric neurons differ greatly in functional state, but whether or not the variation of enzyme activities is related with the different types of neurons is unknown.

Objective To observe effect of personalized health education on drug compliance and efficacy in patients with multidrug-resistant pulmonary tuberculosis. Methods From October 2015 to May 2016, 100 cases with multidrug-resistant tuberculosis were selected. The patients were randomly divided into two groups, 50 cases in each group. The contorl group was given a routine clinical health education, the observation group were received personalized health education . Awareness of disease and medication, medication compliance and satisfaction after education in the two groups were compared. Results The total awareness rate in the observation group was 96.00% (48/50), the total medication compliance rate was 94.00% (47/50), the satisfaction degree was (87.62±6.95) points. The above three indicators in the observation group were better than those in the control group (P<0.05). Conclusion It is possible to improve the patient's awareness and adherence to disease and medication after taking the personalized health education program in patients with multidrug-resistant tuberculosis disease clinically. It can get a better satisfaction test result.

Glutamate is the primary excitatory amino acid in the mammal brain. Glutamate transporters perform the regulation of glutamate levels in synaptic cleft. If the glutamate transporters should not be expressed, stopped working, or gone into reverse releasing glutamate from the cytoplasm, there would be an extracellular build up of glutamate. Defective glutamate uptake has been suggested to be important in connection with amyotrophic lateral sclerosis, Alzheimer's disease and Parkinson's disease.

Objective To study the characteristics of molecular genetics concerning Chinese mitochondr ial encephalomyopathy,lactic acidosis and stroke-like episodes (MELAS). Methods A3243G and T3271C point mutations in the mtDNA of muscle and (or) blood cells were investigated in 9 patients with MELAS and some o f their maternal relatives from 7 families by using PCR-RFLP. Furthermore,mut ant mtDNA in the sample harboring mutation was quantitatively analysed. Results The mtDN A A3243G point mutation was unanimously identified in tissues of all patients an d 1 of their relatives. However,the T3271C point mutation was identi f ied in none of series in our study. The proportion of mtDNA A3243G was 46.8%～ 61. 0% in muscle (4 cases) as well as 26.8%～50.3% in blood (9 cases). In the 3 p atie nts with muscles and blood cells available,their mutant mtDNA proportion in mus cle is consistently higher than in blood cells. The study of leukocytes of some maternal relatives from 6 families showed that,while only 1 proband had a siste r harboring A3243G mutation and none of the mothers of another 3 probands or sib lings of the other 2 probands had the point mutation. However,the sons of 2 pr o bands had not only phenotype of MELAS,but also mtDNA A3243G point mutation in t heir blood. Conclusion mtDNA A3243G mutation highly exists in the series with M E LAS syndrome in our study and can be detected in various tissues,which is consi stent with reports abroad. However,most of our cases are sporadic rather than m aternal inherited. It is presumedly caused by a de novo mutation. Whether i t is due to ethnic difference or sporadic event needs to be investigated further.

Objective: To assess the diagnosis value of applying integrated visual and auditory continuous performance task(IVA-CPT) and EEG biofeedback on children with attention-deficit- hyperactivity disorder(ADHD), and provide information for assisting diagnosis of ADHD. Methods: 113 children with ADHD were tested with IVA-CPT and EEG biofeedback. The sensitivity, specificity, misdiagnosis rate and missed diagnosis rate of these two methods were assessed according to the criteria of DSM-Ⅳ. Results: The sensitivity of IVA-CPT for the diagnosis of children with ADHD was 92.54, the specificity was 76.09%, misdiagnosis rate was 23.911% and missed diagnosis rate was 7.46%. And the sensitivity of EEG biofeedback for the diagnosis of children with ADHD was 83.58%, the specificity was 82.61%, misdiagnosis rate was 17.38 and missed diagnosis rate was 16.42%. Conclusion: Relatively, for diagnosis of children with ADHD, sensitivity is higher and missed diagnosis rate is lower, specificity of EEG biofeedback is higher and misdiagnosis rate is lower .

0.05).In spinal cord tissues of injury groups,the level of HIF-1? mRNA began to elevate at 3h after injury and reached the maximize on 3d,then it began to decline and returned to the basal level on 14d;the HIF-1? expression showed a time-dependent difference as followed: It began to increase at 3h after injury,peaked on 1d,then gradually decreased,and recovered to the normal level on 14d after injury.Conclusion The result suggested that hypoxia circumstance can enhance the stability of HIF-1? and the transcription of HIF-1? mRNA,and the time-dependent expression of HIF-1? and HIF-1? mRNA can be used to help the diagnosis of SCI and estimation of injury time.

Objective To explore the clinical manifestations, pathogenic mechanisms and treatment of Mirizzi syndrome.Method 65 patients with Mirizzi syndrome were analysed retrospectively.Results According to Csendes typing, patients with Mirizzi syndrome included type Ⅰ in 18 patients(27 6%), type Ⅱ in 25 patients (38 4%), type Ⅲ in 13 patients(20 0%), type Ⅳin 9 patients(13 8%), all patients were healed by corresponding operation and perioperative management.Conclusions Good outcome of Mirizzi syndrome patients can be achieved by accurate diagnosis,exact operation and active perioperative management.