Objective To understand the effects of stove-improvement measures in coal-burning-induced fluoride poisoning area in Luoyang.Methods Dynamic monitoring on the fluoride concentration in indoor air,grain(corn and wheat),vegetable(chili,radish and Chinese cabbage),and the urine fluoride concentration and prevalence of dental fluorosis among8-12year old children was conducted after the performance of stove-improvement measures in coal-burning-induced fluoride poisoning area,Jiangzhuang village,Xinan county,Luoyang,during1991-2000,while the obtained data were compared with those in1990.Re sults After the performance of stove-improvement measures,all of the fluoride contents in indoor air,grain and veg-etable,the urine fluoride concentration and the prevalence of dental fluorosis of8-12aged children revealed a trend of decrease on the whole,and accorded with the corresponding standards for non-fluoride poinsoning area,despite of the fluctuating data in different years.Conclu sion The stove-improvement measures could effectively prevent the indoor air,grain and vegetable from fluoride pollution,and control the prevalence of fluoride poisoning in coal-burning-induced fluoride poisoning area.

Objective To evaluate the apical sealing ability of iRoot SP root canal sealer in oval-root canal. Methods After root canals were instrumented by Mtwo, 28 premolars with oval-root canal were randomly divided into 2 groups, 14 teeth in each. The root canals were obturated with AH Plus (group A) and iRoot SP (group B) by modified continuous wave condensation technique. The apical leakage was evaluated by dye penetration method and transparent teeth technique. Results Mean depth of leakage was (0.92 ± 0.26) mm for group A and (0.84 ± 0.40) mm for group B. There was no significant difference between the two groups (t=0.506, P > 0.05). Conclusion The apical sealing ability of iRoot SP is equivalent to AH Plus in oval-root canal.

Objective To construct the vector that expresses the fusion protein of HIV-Tat protein and red fluorescent protein(mCherry) in mammalian cells,and observe by fluorescence microscopy the intracellular transduction and localization of recombinant protein in cells,in order to obtain a useful tool for the study of the uptake mechanism and intracellular localization of HIV-TAT.Methods With the designed primer coding mCherry sequence,the mCherry gene was amplified by PCR with the vector pmCherry-C2 as template,and inserted into vector pET14b-His-TAT to construct the expression vector pET14b-His-TAT-mCherry.The constructed vector was then transformed into E.coli BL21(DE3),which had been identified by PCR and double digested with restriction endonuclease,followed by sequencing.After IPTG induction,the recombinant protein of His-TAT-mCherry was lyzed and analyzed with SDS-PAGE.Purified His-TAT-mCherry recombinant protein was added to Hela cells and the fluorescence was observed to evaluate the transduction efficiency.Results The results of identification by PCR,digestion with restriction endonuclease and sequencing indicated that the vector His-TAT-mCherry was correctly constructed.His-TAT-mCherry fusion protein was expressed in mammalian Hela cell line and purified successfully,and the fusion protein showed cellular transduction activity.It was found by fluorescence microscopy that the red fluorescence protein located mainly over the cytoplasm,and also the membrane to some extent.Conclusion The expression vector is successfully constructed for HIV-TAT labeled with mCherry sequence.Effective expression and purification of this fusion protein is achieved.It has been observed that the constructed vector may be expressed in mammalian Hela cell under active condition.Thus,it might be useful in the study of uptake mechanism and intracellular localization of HIV-TAT.

Objective To investigate the value of Q-analysis real-time elasticity in differentiating between benign and malignant thyroid nodules. Methods Eighty-six thyroid nodules in 62 patients with pathologic diagnosis were included in this study and were examined using Q-analysis real-time elasticity. The real-time elasticity features were observed and the quantitative index including the whole elasticity rate and the local elasticity rate were compared between benign and malignant nodules. Results There were 51 benign and 35 malignant nodules according to histopathological examination. The Q-analysis curve of real-time elasticity of benign nodules was smoother and with lower peak, compared with that of malignant nodules. The whole elasticity rate of malignant nodules were significantly higher than that of benign nodules (3.59±0.84 vs 2.32±0.56, P=0.000). And the local elasticity rate of malignant nodules were significantly higher than that of benign nodules (3.96±1.32 vs 2.39±0.58, P=0.000). The cutoff point of whole elasticity rate for the differential diagnosis was 3.25 with sensitivity, specificity and diagnostic accuracy as 71.4%, 96.1% and 86.0% respectively. The cutoff point of local elasticity rate for the differential diagnosis was 3.45 with sensitivity, specificity and diagnostic accuracy as 68.6%, 96.1% and 84.9% respectively. The diagnostic efficiency of whole elasticity rate and local elasticity rate had no significant difference (P=0.591).Conclusions Q-analysis real-time elasticity could provide the real-time elasticity features of thyroid nodules. The whole and local elasticity rate as the quantitative index contributed to the differential diagnosis of benign and malignant thyroid nodules.

Objective To explore the value of three-vessel and trachea(3VT) view plus aortic arch coronal section in ultrasonic diagnosis and classification of fetal right aortic arch(RAA).Methods Echocardiography data and follow-up results of 44 fetuses with RAA were retrospectively analyzed.Sonographic features on 3VT view and aortic arch coronal section were summarized.Results Among 44 fetuses with RAA,27 cases(61.36%) were RAA with aberrant left subclavian artery(ALSA) and the left ductus arteriosus(LDA) connecting the ALSA and U-shaped vascular ring was formed;17 cases(38.64%) were mirror right aortic arch(MRAA).Among 17 cases with MRAA,3 cases were with LDA connecting the descending aorta(DAO) and U-shaped vascular ring was formed;1 case was with LDA connecting the left innominate artery(LINA),8 cases were with absent ductus arteriosus(ADA),5 case were with right ductus arteriosus(RDA),no vascular ring was formed.Parts of MRAA were combined with other complex intracardiac abnormalities.RAA-ALSA-LDA were rarely combined with intracardiac abnormalities.Conclusions 3VT view is simple and intuitive for diagnosing RAA.Aortic arch coronal section has great clinical value in determining the concrete type of RAA.

Objective To construct a eukaryotic expression plasmid of pcDNA 3.1-Ag85A-CD226, and to use it as DNA vaccine then further evaluate its immunogenicity through oral administration in a mouse model.Methods The CD226-PCR2.1-ToPo plasmid was used as the template to clone CD 226 gene by PCR.The CD226 gene was then inserted into pcDNA 3.1-Ag85A plasmid to construct the recombinant plas-mid of pcDNA3.1-Ag85A-CD226.After identified by restriction enzyme analysis and sequencing , the re-combinant plasmid was transfected into HEK 293 cells by using lipofection .The expression of Ag85A-CD226 gene in HEK293 cells was detected by RT-PCR, Western blot and indirect immunofluorescence assay .The purified recombinant plasmid was used to prepare the Ag 85A-CD226 DNA vaccine by liposomal encapsula-tion.The vaccine was administered intragastrically to mice .The activities of NK cells , the cytokine levels in the supernatants of spleen cell cultures and the mRNA level of cytokines in the intestines were evaluated to analyze the immunogenicity of Ag85A-CD226 DNA vaccine.Results The Ag85A-CD226 DNA vaccine was prepared successfully .The expression of Ag85A-CD226 fusion protein was detected in HEK293 cells.The activities of NK cells from mice vaccinated with Ag 85A-CD226 DNA vaccine were higher than those from other control groups (P<0.01).The level of TNF-α, IFN-γand IL-2 in the supernatants of spleen cell cul-tures and in the intestines were significantly up-regulated in comparison with other control groups ( P <0.01).The level of IL-4 in the supernatants of spleen cell cultures was down-regulated in the experimental group (P<0.01), but the level of IL-4 in intestines showed no significant difference among the five groups (P>0.05).Conclusion The Ag85A-CD226 DNA vaccine could significantly enhance Th1 type immune responses systemically and in the intestine as in comparison with those vaccinated with single dose of Ag 85A DNA vaccine or CD226 DNA vaccine.

Objective To complete an information chain to support stomatological materials purchase and providing manage-ment.MethodsThe main problems of the materials management information chain were analyzed.The system construction,technical architecture and function design were designed based on B/S and C/S structure.Results The vendor cloud platform completed the information chain for purchase and distribution of stomatological materials,and provided technical support to hospital consumables management.Conclusion The system normalizes stomatological materials management,guarantees the safety,timeliness and accuracy of materials supply,and thus is worthy applying practically.

Objective To propose a method for equipment parameter demonstration to improve whole-life cycle management of equipment.Methods The measures and principles of equipment parameter demonstration were put forward based on its present situation and problems.The significance of equipment parameter demonstration for whole-life management was discussed from the aspects of biding,bidding evaluation and post-procurement management.Results The method enhanced equipment procurement,saved human resource,materials and economic cost,and solved the problems such as single source,unutilized equipment and high maintenance cost.Conclusion The method of equipment parameter demonstration maximizes the benefits,and promotes whole-life management of medical equipment.

Objective: To analyze the results of colorectal cancer screening among residents in Baoshan District, Shanghai Municipality from 2013 to 2021, so as to provide the basis for promoting colorectal cancer screening and prevention. Methods: Permanent residents aged 50 to 74 years in Baoshan District from 2013 to 2021 were selected as the screening population. The initial screening was conducted using a risk assessment form and fecal occult blood test. Positive results on either the risk assessment form or fecal occult blood test were considered positive for the initial screening. Participants with positive initial screening results were invited to undergo colonoscopy. The positive rate of the initial screening, colonoscopy compliance rate, and colonoscopy results were analyzed. Results: A total of 264 907 individuals underwent the initial colorectal cancer screening in Baoshan District from 2013 to 2021, with 65 333 individuals (24.66%) testing positive. Among them, the positive rate of the risk assessment form was 12.16%, and the positive rate of fecal occult blood test was 14.64%. A total of 14 473 individuals completed colonoscopy, with a compliance rate of 22.15%. A total of 1 284 precancerous lesions were detected, with a detection rate of 8.87%, and 386 cases of colorectal cancer were identified, with a detection rate of 2.67%. The positive rate of the initial screening, colonoscopy compliance rate, precancerous lesion detection rate, and colorectal cancer detection rate were higher in males than in females (25.55% vs. 24.06%, 23.12% vs. 21.45%, 11.60% vs. 6.74%, 3.62% vs. 1.93%, all P<0.05). With increasing age, the positive rate of the initial screening increased, the colonoscopy compliance rate decreased, the precancerous lesion detection rate and colorectal cancer detection rate increased (all P<0.05). From 2013 to 2021, the positive rate of the initial screening among residents showed a downward trend, while the colonoscopy compliance rate showed an upward trend (both P<0.05). Conclusions The detection rate of precancerous lesions in colorectal cancer was 8.87%, and the detection rate of colorectal cancer was 2.67% in Baoshan District from 2013 to 2021. Male and older individuals were the key populations for screening, and the colonoscopy compliance among residents needs to be improved.

Objective: To evaluate the efficacy of Mtwo rotary instruments during root canal retreatment. Methods : Thirty mandibular premolars with oval root canal were prepared with ProTaper rotary instruments and obturated with lateral condensation method. The samples were divided into 2 groups. In Mtwo group, the filling materials were removed with Mtwo retreatment system and Mtwo basic instruments. Inmanual stainless group, the filling material were removed with manual instruments. The percentage of residual filling material was measured with image proplus software and the operating time was recorded. Results: The percentage of residual filling material in Mtwo group was significantly lower than manual group in middle third, but the opposite result can be found in the coronal third. In the whole canal, no significant difference was found between the two groups. The mean operating time in Mtwo group was significantly shorter than manual group. Conclusion Mtwo rotary instruments can shorten the time of retreatment, neither of the groups can remove the filling material in oval root canal completely.