BACKGROUND:Al oying is a convenient and effective method to alter the microstructure and control the corrosion behavior of magnesium al oy.
OBJECTIVE:To explore the in vitro and in vivo degradation of Mg-Nd-Zn-Zr al oy as a degradable medical biomaterial.
METHODS:(1) In vitro static immersion test:The immersion tests were carried out at (37.0±0.5) thermostatic bath. Six Mg-Nd-Zn-Zr al oy samples and six pure magnesium samples were immersed in the 250 mL simulated body fluid and vibrated without agitation during immersion. After 3, 7 and 30 days static immersion, the samples were taken out from the simulated body fluid. Then the in vitro corrosion properties were evaluated using scanning electron microscope and energy dispersive spectrometer analysis. (2) In vivo animal experiment:After bone tunnel was established in the left femur of adult New Zealand rabbits, the Mg-Nd-Zn-Zr al oy rods were embedded in the Mg-Nd-Zn-Zr al oy group, titanium al oy rods were embedded in the titanium al oy group, and only bone tunnel was established in the sham-operated group. At 1, 2, 4, 8 weeks after implantation, an X-ray of the implanted region was taken to determine the location and the degradation behavior℃in a of Mg-Nd-Zn-Zr al oy. At 4, 8 weeks after implantation, the corrosion product and its element composition were observed using scanning electron microscope with an energy dispersive spectroscopy system.

Urinary sodium was measured by means of 24-hour urine collection in 186 patients with type 2 diabetes.All patients were categorized into quartiles of urinary sodium.There was a significant positive trend of association of greater carotid intima-media thickness(CIMT) with increasing urinary sodium quartile,even adjusting for age,smoking,and blood pressure (Ptrend＜0.01).Multiple linear regression analysis showed that 24-hour urinary excretion may be associated with CIMT in type 2 diabetes patients (β=0.074,P＜0.01).

Interactive mode of ethical review and quality management in clinical trials consists of several parts, which includesconstructing a scientific platform of interactive information management, interactive achievement in the process of informed consent,and interactive management of following review and quality control. It aims to rem-edy the existing defects in the ethical review of clinical trials and quality management system, to guarantee the quality of clinical trials, and to achieve the full coverage of ethical codes in clinical trials.

Objective:To use an isokinetic test to objectively evaluate the recovery of muscle strength and endurance after treatment of acute Achilles tendon rupture using a tunnel beneath paratenon.Methods:A retrospective study was conducted of the 23 patients who had been treated at Department of Orthopedics, The Forth Medical Center, General Hospital of Chinese PLA by a tunnel beneath paratenon for acute Achilles tendon rupture from January 2017 to January 2018. They were 22 males and one female, aged from 26 to 60 years (average, 35.7 years), with 11 right and 12 left sides involved. Surgery was performed 0.5 to 7.0 days (average, 2.7 days) after injury. Length of incision, skin necrosis, infection, re-rupture, ankle-hindfoot score of American Orthopedic Foot & Ankle Society (AOFAS) and Achilles tendon total rupture scores (ATRS) were followed up for 18 months. Surgical outcomes were objectively evaluated by an isokinetic test to compare the recovery of muscle strength and endurance between the affected and normal sides.Results:Skin necrosis, infection or re-rupture occurred in none of the patients. Incision length averaged 1.4 cm (from 1 to 2 cm), AOFAS 99.1 (from 93 to 100, giving an excellent and good rate of 100%), and ATRS 97.0 (from 88 to 100). Isokinetic evaluation showed that the peak torques of ankle plantar flexion and dorsal extension at 5 test speeds (30°/s, 60°/s, 90°/s, 120°/s and 240°/s) were not significantly different between the affected and normal sides ( P>0.05). In the endurance test, the total work of ankle plantar flexion was (691.2±258.8) J on the normal side and (670.6±304.2) J on the affected side, showing no significant difference between the 2 sides ( P>0.05); the total work of ankle dorsal extension at the normal side was (407.3±119.2) J, significantly larger than that at the affected side [(362.2±117.5) J] ( P=0.001). Conclusion:An isokinetic test can be used to objectively evaluate the recovery of muscle strength and endurance after treatment of acute Achilles tendon rupture using a tunnel beneath paratenon.

Objective To evaluate a new enzyme-linked immunospot assay (TSPOT-TB) for the diagnosis of latent tuberculosis infection in patients with rheumatic diseases.Methods The rapid TSPOT-TB assay was applied to detect ESAT-6 and CFP-10 specific T cells in blood samples from 126 rheumatic disease patients.A PPD skin test was performed on all patients simultaneously.Results The positive rate of TSPOT assay was 23.8% and that of PPD skin test was 34.9%.The overall agreement between the 2 tests was 71.4%.Among PPD (-) patients (n=82),11 were TSPOT (+) ( 13.4% ).Among PPD (+) patients (n=44),25 were TSPOT(-) ( 56.8% ).The patients who got BCG vaccination showed a significantly higher rate of positive results of PPD skin test than those who did not(41% vs 19%,P＜0.05).While in TSPOT assay,the BCG vaccination did not show any influence on TSPOT results (22% vs 27%,P＞0.05).Conclusion BCG vaccina-tion affects the results of PPD test in patients with rheumatic diseases,but has no influence on TSPOT results.The infection rate of latent tuberculosis in patients with rheumatic diseases in our study is 23.8% detected by TSPOT.

Objective To assess the incidence,risk factors and mortality of acute kidney injury(AKI)in patients with chronic myelogeneous leukemia(CML)after myeloablative allogenetic hematopoietic stem cell transplantation(HSCT). Methods Renal function in 93 CML patients undergone myeloablative allo-HSCT was retrospectively analyzed by the RIFLE criteria. Results Thirty-nine patients (41.9%) developed AKI at a median of 40 days after allo-HSCT, including 24 AKI-R patients(25.8%), 10 AKI-I patients(10.8%) and 5 AKI-F patients (5.4%). The morbidity of AKI in patients with ≥Ⅲ acute graft-versus-host disease (aGVHD) and without ＜Ⅲ GVHD was (81.82±11.63)% and (36.59±5.32)% (P=0.0037)rospectively. The morbidity of AKI in patients with increased total bilirubin and without increased total bilirubin was (72.73±13.43)% and (37.04±5.37)%(P=0.0192) respectively. ≥Ⅲ aGVHD was peor-prognostic factor of AKI and RR was 2.773 [95%CI (1.073-7.167), P=0.035]. RR of AKI-I and AKI-F in patients with ≥Ⅲ aGVHD was 6.320195%CI (1.464-27.291), P=0.013]. The mortality within 100 days after allo-HSCT of patients with AKI was significantly different as compared to patients without AKI (P=0.001). Six-mouth survival rates of different class AKI patients after myeloablative allo-HSCT were (86.96±7.02)% (AKI-R), (70.00±14.49)% (AKI-I), 0 (AKI-F) (P=0.000)respectively. Conclusions AKI is one of the main complications in CML patients after myeloablative allo-HSCT. ≥Ⅲ aGVHD and increased total bilimbin are poor-prognostic factors of AKI, and higher morbidity of AKI-I and AKI-F can be found in patients with ≥Ⅲ aGVHD. With the deteriorated AKI, 6-month survival is decreased. RIFLE criteria is sensitive to the early diagnosis of renal function. Moreover RIFLE can monitor the progression of AKI and predict the clinical outcome.

Objective To analyze morbidity and prognosis of acute kidney injury (AKI) in patients with acute leukemia after myeloablative allogenetic hematopoietic stem cell transplantation (HSCT).Methods Renal function and related clinical data in 66 patients receiving myeloablative alloHSCT were retrospectively analyzed.Renal function was evaluated by RIFLE criteria,which defines AKI as three grades of severity-risk (AKI-R),injury (AKI-I) and failure (AKI-F).Results Thirtyseven recipients (56.1%) developed AKI at a median of 29 days after allo-HSCT,including AKI-R(19 recipients,28.8 %),AKI-I (11 recipients,16.7 %),AKI-F (7 recipients,10.6 %).Compared with baseline value,serum creatinine level in the recipients was significantly increased at the 21st day after transplantation (P＜0.05).During 100 days after HSCT,the morbidity of AKI-F in recipients with HVOD and without HVOD were respectively (55.56 ± 22.22)% and (9.01 ± 4.75)% (P＜0.01).The morbidity of AKI in recipients with or without increased total bilirubin was respectively (68.75 ± 24.54)% and (8.38 ± 4.17)% (P＜0.01).The morbidity of AKI in recipients with or without increased CsA concentration was respectively (66.67 ± 10.29) % and (44.44 ± 8.28) % (P＜0.05).100-day survival rate in recipients after myeloablative allo-HSCT without AKI,with AKI-R,AKI-I and AKI-F was respectively (89.66 ± 5.66) %,(83.88 ± 8.54) %,(81.82 ± 11.63) % and (42.86 ± 18.7) % (P＜0.05).Conclusion AKI is one of the main complications in patients with acute leukemia after myeloablative allo-HSCT.The influence of different class AKI on the mortality was different.The earlier diagnosis,prophylaxis and treatment of AKI by the RIFLF criteria might increase the survival rate in recipients with HSCT.

Objectiv e To investigate the correlation between ( CAG) n repeat polymorphism of androgen receptor(AR)geneandmalebreastcancer.Methods 40casesofmalebreastcancerand40controlswerecol-lected.DNA was extracted from peripheral blood and the AR gene CAG coding exon sequences for PCR amplifica -tion,sequencing and calculated the number of CAG repeats frquency .χ2 test and Logistic regression analysis were used assess the AR gene CAG repeat length frequency affect the number of male breast cancer risk .Results There was statistically significant difference in male breast cancer cases and controls the number of CAG repeat length frequency.Man for whom the(CAG)n≥22 repeat sequence had 3.52 times risk of male breast compared (CAG)n≤22(OR=3.52,P=0.036).Conclusion AR gene CAG repeat length is a predictor of the frequency of male breast cancer risk .Longer CAG repeats can increase the risk of male breast cancer .

BACKGROUND:Based on the integration of virtual reality technology with acupoints, acupuncture can be expressed three-dimensional y.
OBJECTIVE:To explore the structure of points through reconstructing digitalized three-dimensional visualization of Neiguan (PC6) structure based on VOXEL-MAN and Micro-XCT.
METHODS:Muscles and other tissues adjacent with Neiguan (PC6) were segmented and merged based on the VOXEL-MAN system combined with the anatomical knowledge of acupoints;nerves and blood vessels were performed with three-dimensional reconstruction;the needle-inserting animation of Neiguan (PC6) was obtained by running script file. Three-dimensional visualization and virtual needle-inserting researches of Neiguan (PC6) were performed. Nature of the acupoints was detected by the Micro-XCT-200 machine additional y.
RESULTS AND CONCLUSION:The visualization of the anatomical structure of local Neiguan (PC6) was completed, and the localization and expression of Neiguan (PC6) in the digitized virtual human were realized. The Neiguan (PC6) structure was researched with Micro-XCT-200, and showed there was no new tissue. Local three-dimensional reconstruction of the acupoint structure could help to display the anatomical structure of acupoints and simulate the acupuncture process. It could also help to observe the relationship between the needle body and the surrounding tissues during needle-inserting, which supplying a good basis not only for exploring the security of needle-inserting, but also for improving the clinical effect of acupuncture. The research on the structure of acupoint Neiguan (PC6) by Micro-XCT-200 provides further experimental evidence for the hypothesis of three-dimensional acupoint.

The structure and properties about encoding protein of lactate dehydrogenase A from Taenia solium(Ts LDH-A)were analyzed and predicted by bioinformatics in this study.The immunological characteristics of this novel gene were also analyzed by cloning and expressing.The full-length cDNA encoding Ts LDH-A was identified from the cDNA plasmid library by blastx and rpsblast programs provided by NCBI.The physico-chemical properties and structures of Ts LDH-A were analyzed by tools provided by ExPASy.And the B cell epitopes of Ts LDH-A were predicted by the B Cell Epitope Prediction Tools provided by IEDB Analysis Resource.The PCR amplified coding region of Ts LDH-A was cloned into the prokaryotic expression vector pET-28a (+) and expressed in E.coli BL21 with IPTG induction.The immunogenicity of the purified recombinant protein was analyzed by Western Blotting.It was demonstrated that the amino acid sequence of Ts LDH-A had identity with that of LDH-A from other specie and there was a conserved LDH domain in the deduced amino acid sequence.The full-length cDNA sequence encoding Ts LDH-A included a complete open reading frame(ORF)of 1332 bp and coded to a putative protein with 331 amino acids.The molecular weight of Ts LDH-A was predicted to be 35461.1 Da and the coding protein was demonstrated to contain 3 trans-membrane regions and 4 main B cell epitopes.The active site of L-lactate dehydrogenase located at the epitope aa190-199.The 3 key residues in the catalytic site of enzyme were conserved in different species and located near to each other in spatial position.PCR,double enzyme restriction and DNA sequencing were used to identify pET28a (+)-Ts LDH-A.The recombinant protein could react with the rat's sera as well as the sera from the patients and the swine infected Taenia solium.It is clear that the full-length cDNA sequence encoding Ts LDH-A can be screened from the cDNA library of adult Taenia solium by bioinformatics analysis and can be used to investigate the structure and properties about gene and encoding protein of Ts LDH-A as well as the immunological activities of gene expression in the prokaryotic system.