Object The polysaccharide (CDPS) was isolated, purified and identified from Cistanche deserticola Y. C. Ma, a Chinese materia medica. Methods The polysaccharide was extracted with hot water and precipitated by alcohol. Protein in the precipitates was removed by Sevag method. The products were further purified with column chromatography on DEAE-Sephadex A-50 and Sephacryl S-200. The CDPS was idendified by IR spectrum and UV (200-400 nm) scanning spectrum. Results IR spectrum indicates that there are typical characteristic absorption peaks of polysaccharides. UV scanning spectrum shows that there are no absorption peaks of protein and nucleic acid at point 280 nm and 260 nm. Conclusion The CDPS was identified as homogeneous one.

OBJECTIVEThe effect of sandblasting on the bond strength between 3mol% yttrium-stabilized tetragonal zirconium polycrystal (3Y-TZP) zirconia framework and veneering porcelain was evaluated.

METHODSA total of 21 specimens [(25 ± 1) mm x (3 ± 0.1) mmx (0.5 ± 0.05) mm] were prepared according to ISO 9693. The specimens were then randomly divided into 3 groups. Sandblasting was performed on 2 meshes of Al₂O₃ particles: group A with mesh 110 and group B with mesh 80. Group C, which was not sandblasted, was the control group. The surface roughness of the zirconia framework, as well as the bond strength between 3Y-TZP zirconia framework and veneering porcelain, was measured. The interface microstructure was observed by scanning electron microscope (SEM), and elemental distribution was detected by energy dispersive spectroscopy (EDS).

RESULTSSurface roughness values were (1.272 ± 0.149) μm for group A, (0.622 ± 0.113) μm for group B, and (0.221 ± 0.065) μm for group C. Statistical significance were found among groups (P < 0.05). The bond strength values were (28.21 ± 1.52) MPa for group A, (27.71 ± 1.27) MPa for group B, and (24.87 ± 3.84) MPa for group C. Statistical significance was found between group A and group C (P < 0.05), whereas the other groups had no statistical significance (P > 0.05). Interface adhesion failure was the primary performance. SEM images showed the close interface bonding, and EDS showed that the interface had no obvious element penetration.

CONCLUSIONAl₂O₃ sandblasting can slightly enhance the bond strength between zirconia framework and veneering porcelain.

Aluminum Oxide ; chemistry ; Dental Bonding ; Dental Porcelain ; chemistry ; Dental Stress Analysis ; Dental Veneers ; Materials Testing ; Microscopy, Electron, Scanning ; Shear Strength ; Surface Properties ; Yttrium ; chemistry ; Zirconium ; chemistry

Objective To verify the feasibility of Cas9 microinjection in frozen-thawed pronuclear embryos, based on the model of pronuclear embryos of C57BL/6J mice by in vitro fertilization.Methods After fertilized mouse pronuclear embryos cultured in vitro, one-cell and 2-cell embryos were frozen using EFS20/40 cryopreservation tube.The next day recovered and then cultured.The recovery rate and survival rate of the one-cell and 2-cell embryos were compared.The frozen-thawed and fresh pronuclear embryos were injected with Cas9 mixture and injection buffer into the cytoplasm, and then cultivated to 2-cell embryos,and the survival rate and development rate of the 2-cell embryos were compared.Results The recovery rate of frozen-thawed one-cell embryos was 92.5%, the survival rate was 92.8%, the recovery rate of 2-cell embryos was 90.5% and the survival rate was 95.8%, showing no significant difference.Furthermore, the survival rate of fresh one-cell embryos after Cas9 injection was 92.7%, the survival rate of one-cell embryos of the blank group was 97.5%.While the survival rate of Cas9 injected frozen-thawed one-cell embryos was 82.6%, and that of the blank group was 92%,showing a significant difference between the frozen-thawed injected group and other groups(P < 0.05).The development rate of 2-cell embryos after Cas9 injection was not significantly different.Conclusions Frozen-thawed pronuclear embryos can be used for Cas9 microinjection.

Objective To investigate transfusion transmitted virus (TTV) infection among population of different groups in Shaanxi Province. Methods A nested polymerase chain reaction (PCR) with primers from ORF1 of TTV genome was established to detect TTV-DNA in serum of the patients. ResultsTTV-DAN was detected in the sera of 3 of 50 cases of general population(6％), 2 of 30 cases of vocational blood donors(6.7%),21 of 97 cases with Type B hepatitis (21. 6％), 9 of 35 cases of Type C hepatitis (25. 7％),and 23 of 40 cases with non-A～ non-G hepatitis (57.5 ％ ). ConclusionThere is TTV infection among general population in Shaanxi Province. TTV may be an impor- tant agent to cause non-A～non-G hepatitis. And the patients with HBV or HCV can have overlapping TTV infection.

Objective To investigate the prevalence of human metapneumovirus (HMPV)infection in patients with respiratory infection in Fuzhou area and compare their epidemic features and clinical characteristics with those of infected with respiratory syncytial virus (RSV). Methods A total of 153 sputum or pharyngeal swab samples from patients with respiratory tract infection were collected in Fujian Provincial Hospital in consecutive winter and spring seasons from 2005 to 2007. HMPV was detected by nested reverse transcriptase-polymerase chain reaction (RT-PCR) and RSV was tested by RT-PCR. Parts of PCR products were sequenced and analyzed using DNAMAN software. The clinical symptoms, signs and epidemiology of the respiratory tract infections caused by HMPV and RSV were compared. Results In the 153 specimens, 32 (20.9%) were positive for H MPV, 26 (17.0%) were positive for RSV, and 8 were both HMPV and RSV positive. Nucleotide sequences of three 432-bp PCR products were 100% identical and submitted to GenBank (the accession No. DQ887758).Phylogenetic tree analysis of nucleotide sequences revealed that the three isolates clustered in HMPV belonged to genotype A with part of mutation. Twenty-six samples (26. 7%) were HMPV positive from Dec 2005 to Apr 2006 and 6 (10.7%) were positive from Dec 2006 to Apr 2007. The RSV detection rate was opposite of HMPV. The mean age of RSV infection in children was (2.65±2.65)years old and HMPV infection was (4.58 ±3.35) years old. The main clinical manifestations of both RSV and HMPV infections were cough, sore throat and fever. Conclusions Both HMPV and RSV are the major pathogens of respiratory tract infection in Fuzhou area and HMPV and RSV coinfection could be detected. HMPV infected children are older. The clinical features of HMPV and RSV infections are similar. Single genotype of HMPV is detected in Fuzhou area in this study.

AIM:To investigate the relationship between the expression of adducin 3 (ADD3) and its splicing isoforms and colorectal cancer (CRC).METHODS:The expression of ADD3, ADD3-Ia and ADD3-Ib in 50 pair of CRC tissues , 20 pairs of colorectal polyp tissues , and 2 CRC cell lines SW480 and SW620 before and after oxaliplatin or fluoroura-cil intervention were detected by real-time PCR.The cell activity was determined by MTT assay , the cell migration ability was evaluated by wound-healing assay , and the cell invasion ability was measured by Transwell assay .RESULTS:The expres-sion levels of ADD3 and ADD3-Ib were decreased in the CRC tissues as compared with the normal mucous (P<0.01), and ADD3-Ia/Ib ratio was increased in the CRC tissues (P<0.01).The expression level of ADD3-Ia was higher in T3-4 group than that in T1-2 group (P<0.05).Reduced expression of ADD3, ADD3-Ia and ADD3-Ib in colorectal polyps was observed compared with the normal tissues (P<0.01).Compared with the SW480 cells, the expression levels of ADD3-Ia and ADD3-Ib were lower (P<0.05) and the ADD3-Ia/Ib ratio was higher (P <0.01) in the SW620 cells.After treated with oxalipla-tin or fluorouracil, the cell activity, migration and invasion in the SW620 and SW480 cells were weakened accompanied by the increases in the expression levels of ADD 3, ADD3-Ia and ADD3-Ib to various certain extents .CONCLUSION:In CRC there is a tendency that ADD3-Ib reduction leads to ADD3 decrease, accompanied by an increased ADD3-Ia/Ib ratio.The expression changes of ADD 3 and its splicing isoforms in the CRC may be relevant to its invasion ability .

Objective Acquiring genetic information of Y-SNPs and Y-STRs genetic makers from samples with the surname of Kong, which is useful for exploring the correlation between surname and Y chromosome in forensic applications studies.Methods Two multiplex genotyping assays and SNaPshot assay were used to analyze 255 unrelated male blood samples who share the same surname Kong and 330 unrelated male blood samples obtained randomly. 17 Y-STRs were typed for the surname Kong population samples. The software Arlequin 3.5.1.2 and the program Network 4.6.1.1 were used for data statistical analysis.Results 13 haplogroups were observed. The highest haplogroup frequency in the two populations were O3a2c1a-M117 (21.57%, 14.85%). 196 haplotypes in Kong population deifned by 17 Y-STRs locus were obtained and the haplotype diversity was 0.9939. 14-12-25-28-19-15-12-19-12-11-12-22-12-11-14-10-19 is the typical haplotype. Median Joining algorithm and Mismatch Distribution were adopted to analyze the Y-STR haplotye under haplogroup O3-M122, and the result shows that there are two “central star” distribution. Conclusion Combined with Y-SNP and Y-STR analysis showed that the Kong population had experienced complicated exchanges and expansion or continued growth, which has more than one surname origin. Hence, its population genetic structure and historical differences have potential applications in forensic science.

Objective To establish real-time fluorescent quantitative polymerase chain reaction (FQ-PCR) for human coronaviruses(HCoV)-NL63,HCoV-HKU1,HCoV-OC43 and HCoV-229E,and to investigate the prevalence of the four coronaviruses in children with acute respiratory tract infection(ARTI) in Fuzhou area.Methods Totally of 538 nasopharyngeal swabs were collected from pediatric patients with ARTI,including 289 specimens from children with acute upper respiratory tract infection (AURTI) and 249 from acute lower respiratory tract infection (AURTI) during three consecutive winter-spring seasons from December to April of 2006 - 2009 in Fuzhou area.All the specimens were subjected to FQ-PCR specific for HCoV-NL63,HCoV-HKU1,HCoV-OC43 and HCoV-229E,respectively.The enumeration data were analyzed by chi square test.Results The FQ-PCR methods were established for detecting HCoV-NL63,HCoV-HKU1,HCoV-OCA3 and HCoV-229E.The intraassay coefficient of variation (CV) and interassay CV were both ≤ 1.6％.The coronaviruses were detected in 41 (7.6％) children with ARTI,including HCoV-NL63 in 8 (1.5％)children (1 with AURTI,7 with ALRTI),HCoV-229E in 5 (0.9％; 1 with AURTI,4 with ALRTI),HCoV-HKU1 in 6 (1.1％; 1 with AURTI,5 with ALRTI),and HCoV-OC43 in 22(4.1％; 13 with AURTI,9 with ALRTI).The four coronaviruses were detected during each of the three winter-spring seasons and the positive rates of different periods were not significantly different (P＞0.05).The HCoV-OC43 positive rate was significantly higher than HCoV-NL63,HCoV-229E and HCoV-HKU1 (x2 =6.721,10.979,9.387; respectively; all P＜0.01).ConclusionsIt is suggested that the four coronaviruses might be important virus pathogens in children with ARTI in Fuzhou,China.And detection of them is needed for etiology and epidemiology evaluations for children with ARTI.

Objective To examine the effectiveness of simulation newborn simulator in neona-tal resuscitation training for pediatric residents. Methods From June 2011 to June 2012, 11 residents working in neonatal ward of the Third Hospital of Peking University were enrolled into the study. Eval-uation on the residents was made before the training. Training of simulated teaching using simulation newborn simulator was conducted and evaluation was made after the training. SPSS 18.0 was used for statistical analysis. Comparison was made between pre- and post-training test by paired t test. P<0.05 was considered statistical significant. Questionnaire survey was conduct to acquire residents' feedback. Results A total of 11 participants completed the training and finished the questionnaire. The score of pre-training was 37.82±1.17 versus that of post-training 39.18±0.87(t=4.89, P<0.01). All residents were satisfied with the simulation-based training. Conclusion Simulation training can improve pedi-atric residents' knowledge and skills in neonatal resuscitation.

Objective:To investigate the prevention and treatment for deviation of costal cartilage dorsal onlay grafts in rhinoplasty.Methods:From January 2010 to October 2020, a total of 588 patients (83 male cases, 505 female cases, age range from 25 years to 55 years, 32±4 years in average) accepted costal cartilage rhinoplasty in Shenzhen Mylike Medical Plastic Aesthetic Hospital. During the operation, various methods were used in the process of catilage selection, water bath, sculpture, treatment of nasal dorsal, graft fixation and fascial modification to prevent and treat the deformation and displacement of the costal cartilage dorsal onlay grafts.Results:The immediate postoperative photograph of 588 cases showed that costal cartilage dorsal onlay graft was put on the middle of dorsum. After a follow-up period of 396 cases from 6 to 60 months, the average follow-up period was 12.1 months, there were 44 cases happened with the deviation of dorsal onlay grafts, and deviation was managed after the second rhinoplasty surgery. There was no prolonged function sequela such as ventilation dysfunction, abnormal sensation, or hyposmia occured. 362 cases were satisfied with the aesthetic effect.Conclusions:It is particularly important to grasp the principles of managing costal cartilage in rhinoplasty and to learn how to prevent and treat postoperative complications of costal cartilage dorsal onlay graft.