Objective:To explore the effects of double circumferential fibrotomy(CF)in the improvement of periodontal attachment of the teeth with periodontal disease.Methods:22 migrated incisors of 4 adults were randomly assigned to one-time CF group (T1 )and double CF group(T2)by center line.Periapical intraoral radiographic examination was performed using paralleling technique at pre-and post-leveling-alignment stage of the teeth.Root length,crown-root ratio and the distance of CEJ-AC were measured.The periodontal in-dicators were also recorded during the orthodontic treatment.Data were statistically analysed by comparative t-test.Results:CEJ-AC and crown root ratio reduction was greater in T2 group than those in T1 group(P <0.01 ),but the periodontal indices did not show sig-nificant difference between the 2 groups(P >0.05).Conclusion:Double circumferential fibrotomy can improve periodontal attachment, reasonable orthodontic force does not lead to remarkable root resorption of the periodontitis inflicted teeth.

Objective To investigate the relationship of carotic intimal-medial thickness (IMT) to high sensitive C-reative protein (hs-CRP) and homocysteine (Hcy) in IGT patients. Methods Seventy patients with IGT were divided into two groups by carotic IMT levels: IMT normal group( IMT≤0.9 mm) and IMT increased group(IMT>0.9 mm). Sixty healthy people were chosen as controls. Blood-lipid, hs-CRP, Hcy, BMI, SBP and DBP were measured in all subjects. Results The Hcy and hs-CRP levels in IGT group were higher than those in controls (P<0.01) ,and also the carotic SBP,DBP,TG and TC levels were higher than those in controls(P<0.05). The Hcy and hs-CRP levels in carotic IMT increased group were higher than those in IMT normal group(P<0.05). The levels of the carotic IMT is positively correlated with hs-CRP(r=0.616, P<0.01), Hcy(r=0.557 ,P<0.01), TC (r=0.351,P<0.05), SBP(r=0.252, P<0.05). Hcy is positively correlated with hs-CRP in IMT increased group (r=0.364, P<0.05). Conclusions Compare with controls, the IMT was higher in IGT patients, and it had the early stage of atherosclerosis (AS). Hcy and hs-CRP levels may predict the early stage of AS in IGT. The high level of Hcy may increase the level of hs-CRP,then lead to the early stage of AS.

Anaplastic lymphoma kinase (ALK) rearrangement is one of the most potent carcinogenic genes in non-small cell lung cancer (NSCLC).The first-generation ALK inhibitor such as crizotinib is superior to chemotherapy for NSCLC patients with ALK rearrangement.At the same time,more and more studies have reported ALK inhibitors in brain metastases of NSCLC patients with intracranial efficiency.However,despite the initial clinical data of first-generation ALK inhibitors in the treatment of ALK-positive NSCLC with brain metastases,different degrees of recurrence of tumors after acquired resistance have posed new challenges for follow-up treatment of cancer patients.A new generation of ALK inhibitors,such as alectinib;ceritinib,AP26113 and PF-06463922 have emerged to solve this problem.

Objective:To evaluate the effect of shikonin on the expression of RANTES and chemotactic activity of monocyte in endometriosis.Methods:Established SCID endometriosis models and cultured U937 cells were treated by a series of concentration of shikonin.RANTES transcriptive expression was determined by Real-time PCR,and RANTES secretion was determined by ELISA.Furthermore,Chemotaxis assay in vitro was conducted to elucidate the effect of shikonin on chemotaxis of U937 cells by RANTES.Results:Shikonin improved the RANTES transcription of human endometrium transplanted to SCID mouse(P

OBJECTIVE:To establish a method for the 5 main components (original syringin,chlorogenic acid,eleutheroside E,isofraxidin and quercetin-3-rhamnoside) in the fruits and roots of wild Acanthopanax senticosus. METHODS:UPLC was per-formed on the column of Waters ACQUITY UPLC HSS T3 with mobile phase of acetonitrile-0.3% phosphoric acid (gradient elu-tion)at a flow rate of 0.2 ml/min. Detection wavelength was 300 nm,column temperature was 30 ℃,and injection volume was 10μl. RESULTS:The linear range was 24.56-184.2 μg/ml for syringin(r=0.9993),18.454-138.405 μg/ml for chlorogenic acid(r=0.9993),8.416-63.12 μg/ml for eleutheroside E (r=0.9997),3.286-24.645 μg/ml for isofraxidin (r=0.9993) and 2.522-18.915μg/ml for quercetin-3-rhamnoside(r=0.9998);RSDs of precision,stability and reproducibility tests were lower than 1%;recover-ies were 99.14%-100.50%(RSD=0.48%,n=6)for syringing in the fruits of A. senticosus、99.03%-100.45%(RSD=0.50%,n=6) for chlorogenic acid in the fruits of A. senticosus、99.22%-100.44%(RSD=0.44%,n=6)for eleutheroside E in the fruits of A. sen-ticosus、99.80%-100.80%(RDS=0.44%,n=6)for isofraxidin in the fruits of A. senticosus、99.76%-101.10%(RSD=0.51%,n=6) for quercetin-3-rhamnoside in the fruits of A. senticosus;99.21%-101.20%(RSD=0.73%,n=6)for syringing in the root of A. senti-cosus、99.81%-101.20%(RSD=0.52%,n=6)for chlorogenic acid in the root of A. senticosus、100.00%-101.50%(RSD=0.62%, n=6)for eleutheroside E in the root of A. senticosus、99.22%-100.40%(RSD=0.47%,n=6)for isofraxidin in the root of A. senti-cosus. CONCLUSIONS:The method is simple and stable with good reproducibility,and can be used for the simultaneous determi-nation of original syringin,chlorogenic acid,eleutheroside E,isofraxidin and quercetin-3-rhamnoside in the fruits and root of wild A. senticosus.

Objective:To explore the etiology and treatment of one case of bilateral mandibular second molar impaction with paradental cyst, and to provide a reference for its diagnosis and treatment. Methods:Root canal treatment of the left mandibular first molar of the patient was performed before operation.The left mandibular second molar of the patient was removed;the residual dental follicle, the granulation tissue and the cyst wall were stroken off under local anesthesia.The diamond ball was used to polish the wound cavity and sharp bone edge, and to mill the distal apical part of left mandibular first molar.The tissue removed during the procedure was used for the pathological examination.Results:The X-ray image showed that the bilateral mandibular second molar was impacted with the left mandibular first molar root's absorption, and there was a clear round-like density reduction zone around the second molar crown.The pathologic result was paradental cyst.Conclusion:Dental impaction complicated with paradental cyst could occur in other tooth position except for the third molar.Its diagnosis should be combined with the clinical manifestations, the pathologic manifestations and the medical imaging.Multidisciplinary consultation is in favor of its diagnosis and treatment.

Objective To study the correlation between ABO blood groups and leukemia and lymphoma, and the regional difference. Methods A case-control study had been conducted. The distribution of ABO blood groups was investigated in leukemia patients, lymphoma patients and controls, respectively. Also ABO blood group distribution of leukemia and lymphoma were compared in different areas. Results The distribution of ABO blood groups between patients with acute non-lymphocytic leukemia, acute lymphocytic leukemia, non-Hodgkin lymphoma and health person was significantly different (χ2 = 21.23, χ2 =8.36, χ2 = 9.39,P <0.05). There were regional differences in the ABO blood groups distribution of leukemia and lymphoma,especially ABO blood groups were significantly different in leukemia patients (χ2 = 50.65, P <0.05).Conclusion ABO blood groups might be a genetic susceptible factor of leukemia and lymphoma, but the geography might be a major influential factor.

Objective To investigate the possibility of differentiation and spermiogenesis of spermatocytes under in vitro condition. Methods Testis biopsy was done in 11 cases with non-obstructive azoospermia.Cells were prepared from 9 samples with spermatocytes and cultured in medium containing follicle stimulating hormone 50 U/L and testosterone 1 μmol/L.Sperms and cells of other types were counted and the proportion of every cell type was calculated before and 24 hours after culture.Flow cytometry was conducted before and 24 hours after culture in 2 cases to analyze the ploidy of the cells. Results The proportion of sperm in 9 samples was ( 17.7 ± 8.9 ) ％ before culture and ( 25.6 ± 10.3 ) ％ after culture ( P =0.004).Sperm increased significantly after culture.Flow cytometry demonstrated that the diagram of 4 n,2 n and 1 n converted to 2 n and broader 1 n. Conclusion Meiosis of spermatocytes and the transformation of spermatid into sperm could arise in in vitro culture.

Immunological checkpoint inhibitors have become one of the major treatment options for patients with advanced non-small cell lung cancer (NSCLC).Despite patients with NSCLC show the superiority of standard chemotherapy in different disease settings,the response rate is still low in patients with high macromolecule selection for chemotherapy tolerance and gene mutation.This is related to the complexity and dynamics of known limited biomarkers and tumor microenvironment.Different methods of tumor cells to evade the immune system used to lay the foundation for the new combination strategy.Combination therapy not only improves the efficacy of treatment,but also makes the objective response rate improved significantly.

Objective:In order to study the necessity of introducing PhD students into the large-scale instrument platform and how to make them play a better role in work through management.Methods:The status of technicians in large-scale instrument and equipment platforms of domestic and foreign universities and scientific research institutions were investigated; combined with the experience of more than 10 years of operation of the technology platform of State Key Laboratory of Natural and Biomimetic Drugs of Peking University, the analysis was carried out.Results:In recent years, the large-scale instrument platforms of major universities and scientific research institutions have strengthened the introduction of high-level talents and the construction of the team. Maintain the stability of the instrument service staff through management measures such as rank promotion and salary enhancement.Conclusions:High-precision instruments are the foundation of the instrument technology platform, and well-educated talents are the core of the instrument technology platform. Only when more PhD students join the technology platform, can the high-precision instruments and equipment exert their maximum functions and promote scientific research.