The coadsorption behavior of two complementary DNA bases,adenine(A) and thymine(T),was studied on Au(111) electrode by cyclic voltammetry(CV) and electrochemical scanning tunneling microscopy ( ECSTM) in aqueous solution. From the CVs,the coadsorption behavior of A and T was more closed to the adsorption behavior of A. In the potential range of physisorption,high- resolution ECSTM images of revealed that a new super-structure was formed by the hydrogen bonds between A and T. A molecular model of the super-structure was proposed based on the STM results and the possible hydrogen bonds between A and T.

目的观察中药汽化熏蒸加肩关节运动治疗肩周炎的疗效。方法将128例肩周炎患者分成治疗组68例和对照组60例,前者采用中药汽化热疗加肩关节运动疗法治疗,后者采用口服止痛药加外贴止痛膏治疗。结果治疗组有效率97%,对照组有效率80%,两组间有显著性差异(P<0.05)。结论中药汽化熏蒸加肩关节运动疗法治疗肩周炎可获得明显疗效。

10.3969/j.issn.2095-4344.2013.24.001

Objective To explore the correlation between resistins rs2161490and rs1423096 genotype with type 2 diabetes mellitus (T2DM)in Guangdong.Methods Collected 178 blood of newly diagnosed T2DM in the Second Affiliated Hospital of Guangzhou Medical University from January 2015 to November 2015 as the patient group and 192 blood of healthy physi-cal examination as the control group.Analysis of the two groups of gene distribution frequency was to reach the genetic equi-librium,comparative two gene loci frequencies of resistin rs2161490 and rs1423096 in case group and control group was sta-tistically significant,and compared the distribution frequency of rs2161490 locus T→C and rs1423096 locus A→G between the patient group and the control group.Then made a logistic regression analysis:analysing the risk two loci each genotype of resistin rs2161490 and rs1423096 to T2DM,adjust of the gender and age,and the changes of the risk of the two variables. Comparative blood lipids biochemical indexes between case group and the control group,mode the correlation analysis be-tween TG,CHOL,HDL-C and LDL-C levels of serum lipids in patients with rs2161490 and rs1423096 each genotypewere performed.Results The sample was consistent with Weinberg Hardy’s law of inheritance,which was representative of the population,comparing two gene loci frequency of resistin rs2161490 and rs1423096 of case group and control group:com-parinng CT,TT,CC of rs2161490 genotype,there was no statistically significant difference (P=0.834,>0.05),and com-parinng AA,AG,GG of rs2161490 genotype,there was no statistically significant difference (P=0.960,>0.05).Each gen-otypes with T2DM risk analysis,there was no statistically significant difference(P>0.05).Adjusting the risk change after the two variables,gender and age,there was no statistically significant difference (P>0.05);TG,CHOL,HDL-C and LDL-C in each of the genes expression levels correlation analysis,there was no statistically significant difference (P>0.05).Con-clusion Analysis results showed that the frequency of two loci all genotypes in the case group and control group were no statistical significance (P>0.05).The risk of two loci gene type of rs2161490 with rs1423096 and type 2 diabetes were be-fore and after the covariate adjustment had no statistical significance (P>0.05 ).Each genotype of rs2161490 with rs1423096 and lipid levels had no statistical significance (P>0.05).Thus infer that two genotypes is not risk for type 2 dia-betes genes in guangdong area.

Objective To investigate the value of neuronavigation system in resection of pituitary adenoma through the endonasal transsphenoidal approach. Methods Twenty-one patients with pituitary adenomas underwent magnetic resonance imaging (MRI) or CT scans studies. The image datasets were transported into the neuronavigation system. The anatomic information of approach was reconstructed for three-dimensional visualization and the best approach was designed. The midline structure and internal carotid artery were displayed in real-time intraoperatively, the anterior-wall of sphenoidal sinus and the floor of sella were accurately opened and the tumor was resected guiding by neuronavigation system. Results All the operations were smoothly and accurately performed under the neuronavigation by transsphenoidal approach. No injury occurred in the internal carotid artery and cavernous sinus. After surgery, 13 patients got better vision and visual field. Postoperative transient diabetes insipidus was found in 11 cases, and CSF leak in 1 and serious hyponatremia in 2 cases. Total tumor removal was achieved in 17 patients and subtotal removal in 2 cases during operations, which were confirmed by postoperative MRI. Three-month follow-up data showed only one recurrence case (subtotal tumor removal), the recurrence rate was 4.8%. Conclusion Neuronavigation system provided real-time localization with three-dimensional anatomic information of the endonasal transsphenoidal approach during pituitary adenomas surgery. As a result, the approach proceeds more smoothly and accurately, the tumor can be resected more completely, the surgical injury and complications can also be reduced.

BACKGROUND:Loose bodies in the knee are found to survive for a long term and maintain certain histophysiological properties of cartilage tissue. Therefore, a bold hypothesis is proposed that the joint cavity may be a preferred environment for chondrocyte growth and development, supporting the concept of “intracavitary culture and intracavitary transplantation”.
OBJECTIVE:To observe the trait difference of chondrogenic culture with alogenic decalcified bone matrix and bone marrow mesenchymal stem cels in the joint cavity orin vitro versus cartilage in the same cavity.
METHODS:There were three groups in this experiment: inin vitro culture group, bone marrow mesenchymal stem cels from newborn rabbits undergoing chondrogenic culture were co-cultured with decalcified bone matrix from adult rabbitsin vitro; in intracavitary culture group, bone marrow mesenchymal stem cels from newborn rabbits undergoing chondrogenic culture were co-cultured with decalcified bone matrix from adult rabbits in the joint cavity; normal cartilage in the same cavity served as control group.
RESULTS AND CONCLUSION: (1) After 12 weeks of culture, in the in vitro culture group, hematoxylin-eosin staining showed a smal amount of chondrocytes proliferated, with blue-stained nuclei; toluidine blue staining showed chondrocytes arranged disorderly, surrounded by a smal amount of matrix; Masson staining showed a smal positive area and irregular cellarrangement; type II colagen immunohistochemistry staining showed a few of yelow particles in the cytoplasm and extracelular matrix. (2) After 12 weeks of culture, in the intracavitary culture group, hematoxylin-eosin staining showed proliferation of chondrocytes with blue-stained nuclei; toluidine blue staining showed cluster-shaped arrangement of chondrocytes surrounded by the matrix with lacuna formation; Masson staining showed there were many positive cels with blue-stained matrix that arranged in a certain stress direction; immunohistochemical identification of type II colagen was positive, and brown-yelow stained particles could be discerned in the extracelular matrix. These findings indicate that tissue-engineered cartilage can be generated by co-culture of alogenic decalcified bone matrix and bone marrow mesenchymal stem cels in the joint cavity orin vitro, and the cartilage cultured in the joint cavity is more close to normal cartilage than that cultured in vitro.

Objective To investigate the relationship between serum tumor markers and the severity of silicosis.Methods Retrospective study.Total of 160 patients with silicosis were included in the study, and 160 healthy volunteers were recruited as the control group.Tumor marker levels in both bronchoalveolar lavage fluid(BALF)and serum were detected by the immunochemiluminecence methods.The pulmonary function parameters, blood gas analysis and lactate dehydrogenase(LDH)were also analyzed.Lung tissue obtained by a patient with silicosis was stained by neuron specific enolase(NSE), carbohydrate antigen125(CA125) and carbohydrate antigen19-9(CA19-9).Results Serum NSE, CA125 and CA19-9 levels were significantly higher in cases than those in controls[(34.47±13.30)μg/L vs(10.24±7.20)μg/L,t=20.27, P<0.000 1;(33.96±17.80)kU/L vs(12.23±15.30)kU/L, t=11.71, P<0.000 1;(4.68±5.67)kU/L vs(2.78±3.45)kU/L,t=3.67,P<0.002].Significant negative correlations were found between values of tumor markers(CA125 and CA19-9) and spirometric parameters,such as forced expiratory volume in one second %(FVE1%), forced expiratory volume in one second/forced vital capacity(FVE1/FVC), carbon monoxide diffusion capacity (Dlco) and total lung capacity(TLC) (r=-0.423,P=0.001;r=-0.323,P=0.011;r=-0.479,P=0.001;r=-0.285,P=0.043) and (r=-0.324,P=0.022;r=-0.256,P=0.023;r=-0.354,P=0.013;r=-0.356,P=0.012).Significant positive correlations were also observed between values of these tumor markers and LDH(r=0.378,P=0.001 and r=0.347,P=0.21).Significant negative correlations were found between NSE and Dlco and TLC(r=-0.374,P=0.004 and r=-0.368,P=0.002).Significant positive correlations were also observed between NSE and LDH(r=0.404,P=0.001).The NSE and CA19-9 levels in BALF were significantly higher than those in serum[(39.32±29.30)μg/L vs(25.7±12.12)μg/L,t=2.15,P=0.036;(21.36±12.11)kU/L vs(11.28±10.78)kU/L, t=2.64,P=0.012].Patients experienced a decrease in NSE and CA19-9 concentrations following whole lung lavage[(39.20±10.24)μg/L vs(15.32±8.35)μg/L,t=8.02,P<0.05;(26.24±12.23)kU/L vs(18.84±5.64)kU/L,t=2.46,P<0.05].Immunohistochemical studies showed positive NSE and CA19-9 staining in lung biopsy specimen.Conclusion Elevated serum tumor markers including NSE, CA125 and CA19-9 would provide valuable clinical information to assess disease severity in silicosis.

ObjectiveTo discuss the role of neuronavigaition technique in localizing and facilliating microsurgical resection of intracranial ateriovenous malformations (AVM) .Methods Forty-three cases with intracranial AVM treated microneurosurgically asisting by Stryker Leibinger neuronavigation system were retrospectively analyzed.Results After reaching neuronavigation calculated technical accuracy (less than 2 mm) and continual intraoperative navigating accuracy, all of the 43 AVM lesions were completely resected.In 41 patients, syptoms were significantly improved (95.4％) at discharge, new neurofuntion defection were found in 2 patients(4.6％) , no death occured.ConclusionNeuronavigation techniques helps the surgery in planning a precise surgical approach to the targeted AVM lesion and tracing the neurovascular structures ,improves the safety of the surgery and the functional outcome of the patients, contribute to lesion resection and reduce operative complications.

Objective To study the early expression of ca]pain Ⅱ and microtubule associated protein 2 (MAP2) mRNA in the hippocampus of the lateral fluid percussion injury rats. Methods 18 Male Sprague-Dawley rats were randomly divided into 3 groups. The changes of Calpaln Ⅱ and MAP2 mRNA in hippocampus 3 h after injury were detected by real-time PCR. Results Compared to the control group (n = 6), the expression for Ca]pain Ⅱ mRNA increased obviously(P <0.01)in the lateral fluid percussion injury group(n=6) ,the expression for MAP2 mRNA degraded obviously(P <0.01). Compared with the lateral fluid percussion injury group(n =6) ,the expression for calpuin Ⅱ mRNA in the mild hypothermia group degraded obviously (n = 6), the expression for MAP2 mRNA increased obviously(P <0.01). Conclusion Mild hypothermia may act as neuroprotection by inhibiting the expression of Ca]pain Ⅱ and easing the degradation of cytoskeleton.

Objective To compare the fusion effect between lumbar posterolateral fusion (PLF) and posterior lumbar interbody fusion (PLIF) in elderly patients with lumbar spinal stenosis.Methods Data of 313 patients undergoing PLF or PLIF for treatment lumbar degenerative disease in Department of Orthopedics,Beijing Hospital of China Ministry of Health during January 1996 to December 2011 were retrospectively analyzed.Patients were divided into PLF group (n=116 cases) and PLIF group (n=197 cases).Data of fusion rate,operative time,operative blood-loss and complications were analyzed statistically.Results The fusion rate was 84.5％ in PLF group and 98％ in PLIF group.The average operative time was 247.8 min (120-480 min) and 240.6 min (90-600 min) in PLF and PLIF groups respectively.The blood-loss was 1142.9 ml (200 4500 ml) and 927.0 ml (200-2800 ml) in PLF and PLIF groups respectively.Postoperative complications were found in 38 cases in PLF group and in 36 cases in PLIF group.There were significant differences in fusion rate,operative time,operative blood loss,complications between the two groups (all P＜0.05).Conclusions PLIF has better effects on fusion rate and fusion grade than PLF.