BACKGROUND: The impact of obesity on total hip arthroplasty has been discussed. However, there is a lack of follow-up study on the patients with different body mass indexes using three-dimensional gait analysis. OBJECTIVE: To investigate the effect of body mass index on the early-term functional recovery after total hip arthroplasty by three-dimensional gait analysis. METHODS: Sixty patients who underwent total hip arthroplasty at Department of Joint Surgery of Affiliated Zhongshan Hospital of Dalian University from January 2017 to June 2018 were enrolled. According to the body mass index at admission, they were divided into overweight group (body mass index ≥ 25 kg/m2) and normal group (body mass index < 25 kg/m2), n=30/group. All patients signed the informed consents and the study was approved by the ethics committee of the hospital. The clinical data such as surgical site, age, sex, height, body mass, and operating time were collected. At 6 months postoperatively, three-dimensional gait analysis was used to collect the time-distance parameters (stride length, stride frequency, mean velocity), kinetic parameters, and kinematic parameters to evaluate the hip joint function. RESULTS AND CONCLUSION: (1) There was no significant difference in the surgical site, sex proportion and age between two groups (P > 0.05). The operation time in the overweight group was significantly longer than that in the normal group (P=0.000). (2) In terms of time-distance parameters, there was no significant difference in the stride length, stride frequency and mean velocity between two groups. The stride length in the overweight group was smaller than that in the normal group (1.08±0.18 vs. 1.35±1.45 m). (3) The range of motion of each planes of hip joint in the overweight group was significantly less than that in the normal group (P < 0.05). (4) In terms of kinetic parameters, the peak torque of hip flexion in the overweight group was significantly less than in the normal group (P=0.011). There was no significant difference in the peak torque of hip extension between two groups (P=1.000). (5) To conclude, obesity has certain effect on the early functional recovery after total hip arthroplasty.

Objective To OxplorO thO rOlationship bOtwOOn diffOrOnt vOntilation modO and hypocapnia in prOtOrm infants.Methods From April 2014 to OctobOr 2017,a total of 302 prOtOrm infants with rOspiratory distrOss syndromO in Suining COntral Hospital who rOcOivOd diffOrOnt assistOd vOntilation wOrO sOlOctOd in this rOsOarch. According diffOrOnt vOntilation modO, thOy wOrO dividOd into convOntional mOchanical vOntilation(CMV) group( n=66),thO mOchanical vOntilation modO was CMV, continuous positivO airway prOssurO(CPAP) group(n=149),thO mOchanical vOntilation modO was CPAP, high frOquOncy vOntilation(HFOV) group(n=87),thO mOchanical vOntila-tion modO was HFOV. ThO morbidity of hypocapnia in diffOrOnt groups and prOvOntion mOthods wOrO analyzOd. Results Among 302 childrOn,52casOs had hypocarbonOmia,thO total morbidity of hypocapnia was 17.2%. ThO morbidity of hypocapnia in thO HFOV group was 37.9% (33/87),which in thO CMV group was 21.2% (14/66), which in thO CPAP group was 3.4% (5/149),thO diffOrOncO among thO thrOO groups was statistically significant(χ2 =47.013,P=0.000).Conclusion ThO incidOncO of invasivO vOntilation should bO carOfully considOrOd in prOtOrm infants, OspOcially high frOquOncy vOntilation. To prOvOnt and trOatmOnt of hypocapnia, timOly adjustmOnt of vOntilator paramOtOrs according to blood gas during diffOrOnt vOntilation modO should bO donO.

Objective Patients with knee osteoarthritis undergoing total knee arthroplasty may have a different degree of pain during the perioperative period. This will not only bring a lot of adverse effects to the patients,and directly affect the early postoperative functional exercise and rehabilitation of the knee joint. At present,the commonly methods used to relieve the pain after TKA are:patient con-trolled Intravenous analgesia(PCIA)、patient controlled epidural analgesia( PCEA)、continuous femoral nerve block analgesia(CFNB)、joint peripheral injection analgesia and some methods without using medi-cine. In this paper,the analgesia methods used during the perioperative period of TKA and the latest de-velopment are reviewed.

Retinitis pigmentosa (RP) is a large group of common hereditary eye diseases with highlyheterogeneous genetic background. Over forty genes with diverse functionalities are associated with RP and they include a set of ubiquitously expressed genes. These include five genes involved in the precursor messenger RNA( premRNA) splicing. Recent progress in disease gene identification for RP has established the involvement of pre-mRNA splicing as one important mechanism in the disease etiology and has shed light on the splicing process itself, a fundamental biological process. To this date, studies in this field have been focused on two major issues. First, how do the mutations of the adRP associated splicing factors (adRP-SF) affect the splicing function? Second, how do the mutations in these ubiquitously expressed genes lead to specific retinopathy? The two topics fit with the two continuous important steps of the disease pathogenesis. Recently, researchers have made a dramatic progress in the first topic. The identification of the SNRNP200 gene,the fifth adRP-SF and its relevant functional study has shown significance to the progress in the study of RP. Numerous investigations are also being carried out in addressing the second issue.Generation of a variety of models led to a better description of the pathological process of the disease. However, in respect to the key pathogenic mechanism,researchers are still puzzled with a number of confusing questions. In this commentary,the results from the latest investigations were summarized, and in particular,the difficulties in studying the molecular mechanism by which the pre-mRNA splicing deficiency causes RP were detailed.

ObjectiveTo study the protection of Chinese herbs on the ischemic brain of rats. Methods 75 Wistar rats were divided into 5 groups, Group 1 for false operation. For the other four groups, the common carotid artery was exposed then was ligatured and cut off, Group 2 for model. From the 20th hour after operation on,Group 3, 4, 5 were fed with complex prescription of Chinese medicine named Prescription 1, 2 and 3 once a day respectively. 3 hours after taking medicine, Groups 2-5 were put in the hypoxia environment for 1 hours, then taking the medicine for 7 days. On the 7th day after operation,the blood was taken from R. atria then the rats were killed and the whole right brains were cut off. Malonaldehyde (MDA), notric oxide synthetase (NOS) and superoxide dismutase (SOD) in the brain tissue and serum, and calcium in the brain were measured respectively. ResultsThe three prescriptions can decrease the quantity of MDA both in brain tissue and serum and the calcium in brain tissue(P<0.05-0.001).Prescription 1 can enhance the activity of SOD in brain tissue while the others can decrease the activity of NOS. The hippocampus cells show tidy, and the number of the necrotic cells decrease greatly among them, Groups 4 and 5 are better than Group 3.Conclusions Prescriptions 1-3 can protect the brain tissue of the rat form ischemic brain injury.

Background and purpose:miR-17-92 gene cluster overexpression has been observed in various cancers, such as lung cancer, liver cancer, gastric cancer and prostate cancer. In this study, we established the stable cell line overexpressingmiR-17-92 to explore the inlfuence ofmiR-17-92 on the migration, invasion abilities and cisplatin resistance of the prostate cancer DU145 cells.Methods:miR-17-92 overexpression vectors were constructed. DU145 cells were infected with the viral supernatants produced by Phoenix A packaging system. Real-time lfuorescent quanti-tative polymerase chain reaction (RTFQ-PCR) was conducted to detect the expression level of miR-17-92 in the cells. The migration and invasion abilities were measured by a real-time xCELLigence system. The scratch healing assay was carried out to investigate the migration abilities. The expression of integrin β1 was detected by Western blot, and the activities of matrix metalloprotein-2 (MMP-2) and matrix metalloprotein-9 (MMP-9) were measured by gelatin zymography experiment. The cell growth of the two cell lines after the treatment of cisplatin was detected by a real-time xCELLigence system. The mRNA expression ofERCC1 was measured by RTFQ-PCR. Western blot was conducted to investigate the protein expressions of ERCC1, ERK1/2 and pERK1/2.Results:DU145-miR-17-92 cells migrated faster than DU145-control cells during the 24 h continuous monitoring (P<0.01). The scratch healing assay indicated that DU145-miR-17-92 cells migrated from the edge towards the scratch center faster than DU145-control cells. DU145-miR-17-92 cells invaded through matrigel markedly faster than DU145-control cells (P<0.01). The protein expression level of integrin β1 and the MMP-9 activities in DU145-miR-17-92 cells were increased than those in DU145-control cells. After the treatment of cisplatin, DU145-miR-17-92 cells grew faster than DU145-control cells, presenting cisplatin resistance (P<0.01). The phosphorylation of ERK1/2 in DU145-miR-17-92 cells was constantly at a high level regard-less of the treatment of cisplatin. Compared with DU145-control cells, the expression of drug resistance-related gene ERCC1 was dramatically increased in DU145-miR-17-92 cells after the treatment of cisplatin.Conclusion:miR-17-92 overexpression increases the migration and invasion abilities of the prostate cancer DU145 cells, which is associated with the upregulated expression of integrin β1 and the increased activity of MMP-9. Besides,miR-17-92 overexpression enhances the cisplatin resistance of DU145, which is correlated with the increased phosphorylation level of ERK and the upregulated expression of ERCC1 at both the mRNA and protein levels.

For the protection of consumers and developments of relevant industry, authentication of medicinal plants is a critical issue.This review covers various aspects of authentication methods and techniques based on molecular biology and genomics with special emphasis on molecular biology techniques including genome-based authentication,microchip-based authentication, DNA barcoding, and their applications.

Aim: To set a suitable route for efficient expression and purification of recombinant hyaluronan syn-thase from Pasteurella multocida (rPmH AS). Methods: Coding sequences were cloned and expressed in Esche-richia coli strain of BL-21( DE3). Then rPmHAS was purified through a simple Ni-affinity chromatography and identified by hyaluronic acid binding protein ( HABP) based ELISA assay. Results: High yield expression of functional rPmHAS exceeding the highest production reported hitherto was achieved, and the purity of rPmHAS was as high as 90%. Conclusion: In this study, an optimized system of the expression, purification and identifica-tion route for large scale preparation of rPmHAS was established, which will be helpful for accelerating further study of PmHAS and facilitating fine researches on peculiar hyaluronic acid with special properties.

Objective To evaluate the effect of preoperative aescuven forte tablets in the prevention of procedure for prolapse and hemorrhoids(PPH) complications.Methods One hundred and seventy-nine patients underwent PPH in the Erlonglu Hospital of Beijing from June 2013 to June 2014 were divided into postoperative aescuven forte tablets group (n =90) and preoperative aescuven forte tablets group (n =89).The postoperative pain,bleeding,retention of urine,anal swelling,length of stay in hospital and recurrence were compared between the two groups.Results The incidence of postoperative pain,bleeding,retention of urine,anal swelling were lower than in the preoperative aescuven forte tablets group (pain after operations rate:7.9％ (7/89) vs.20.0％ (18/90),x2 =5.484,P＜ 0.05;Wound bleeding:0 vs.6.7 ％ (6/90),P =0.026;retention of urine:9.0％ (8/89) vs.20.0％(18/90),x2 =4.370,P＜0.05;anal swelling:1.1％(1/89) vs.8.9％(8/90),P=0.035),and length of stay in hospital was shorter(11.9±3.9) d vs.(13.3 ±5.0) d,t=3.134,P＜0.05).There was no recurrence both of two groups follow up for more than 2 months.Conclusion Preoperative oral aescuven forte tablets of 2 h can reduce PPH complications and worthy of popularization and application.

An optimized two-dimensional polyacrylamide gel electrophoresis (2-DE) system for analyzing plant proteins was developed by evaluating different reagents and concentrations used in the sample extraction solutions and lysis buffers. Two main sample preparation methods, referred to as trichloroacetic acid (TCA)-acetone method and phenol extraction-ammonium acetate/methanol (phenol-NH4Ac/methanol) precipitation method, were compared. Four ecotypes of reed plants (Phragmites communis Trin.) from the desert region of north-western China were used as experimental materials: (1) swamp reed (SR) which grows in water about 1 m deep; (2) dune reed (DR) which grows on 5～10 m high sand dunes; (3) heavy salt meadow reed (HSMR) which grows on low-lying salt flats; and (4) light salt meadow reed (LSMR) which grows in the transition area between DR and HSMR growing areas. The optimized phenol-NH4Ac/methanol precipitation method consisted of extracting leaf proteins of different ecotypes of reed with water-saturated phenol and then precipitating with a 5-fold volume of 0.1 mol/L NH4Ac in methanol, followed by dissolving in the lysis buffer. The optimized protein lysis buffer consisted of 7 mol/L urea, 2 mol/L thiourea, 4% CHAPS, 2% Ampholine(pH 3.5～10∶pH 5～8 = 1∶4) and 65 mmol/L DTT. The prepared protein sample (80 ?g) was then separated by 2-DE gel and detected by silver staining method. This improved 2-DE system resulted in a 2-D protein profile of higher resolution and higher protein yields as analyzed by PDQuest software. Good results were also obtained when this 2-DE system was used in 2-D analysis of proteins from other plant materials, such as rice leaves, indicating that it is a suitable 2-DE system for analyzing leaf proteins of different plant species.