302 teeth with wedge-shaped defect in 168 patients were restored by SDR(smart dentin replacement,n =112),glass ionomer (n =98) and light-cured composite resin(n =92) respectively.12 to 15 month follow-up showed the success rate was 96.2％,84.8％ and 86.2％ respectively(P ＜ 0.01).SDR is an ideal material in restoring wedge-shaped defect.

Aim To study the effects of totle flavone of allium cepa L.var agrogatum Don(TFAD)on the blood-liquid metabolism in experimental hyperlipoproteinemia rats.Methods The model of experimental hyperlipoproteinemia was established by giving hyperlipid diet to Wistar rats.After the model was established,the rats were treated by TFAD.Then TC、TG、LDL-C、HDL-C of serum,MDA and SOD activties of serum and liver,TXA2 and PGI2 of plasma,blood viscosity were mesured,and pathology of liver was observed.Results After treated by TFAD(25～100 ?g?g-1 po for 21 days),TC、TG、LDL-C、AI、TC/HDL-C and MDA were reduced remarkably,HDL-C and the activity of SOD increased,PGI2 in plasma rose while TXA2 decreased,the blood viscosity of whole blood was depressed significantly,meanwhile the fatty degeneration of hepatic cells was relieved.Conclusions The results suggest that TFAD can adjust the blood-liquid metabolism of experimental hyperlipoproteinemia rats and restrain fatty deposition in liver which may be related to TFAD's function of preventing lipoprotein peroxidization,maitaining physiologic equilibrium of PGI2/TXA2,and ameliorating the abnormity of blood rheology.

Soil water is one of the most important components in hydrological cycle. The stable hydrogen and oxygen isotopes in soil water have been increasingly used in the ecological, environment and hydrological research. In view of different techniques for extracting soil water, there is significant difference in theδD andδ18 O composition. This paper presents a method for analyzing hydrogen and oxygen isotopes in soil water by using elemental analyzer and isotope ratio mass spectrometry with accelerated solvent extraction for sample pretreatment. The conditions are: extraction solvent: dichloromethane, temperature: 100 ℃, pressure of 10. 3 MPa, static time:10 min. The samples were extracted three times, and with cycle values of four, four and three, respectively. Comparing with the added water, the deuterium and oxygen isotope values in the extracted soil water enrich 2. 12‰-4. 58‰ and 0. 17‰-0. 93‰, respectively. The reproducibility of replicate extractions of soil water is around ±0. 89‰ for δD and ±0. 37‰ for δ18 O.

Objective To explore the status quo and the correlation of professional practice environment and job burnout in head nurses. Methods Totally 646 head nurses from city state hospitals of Hunan Province was selected by cluster sampling method. Participants were investigated by using the Chinese Version of Profession Practice Environment Scale for Head Nurses and Maslach Burnout Inventory. Results The professional environment score was 215.95±22.81, which was in the moderate level. The score of emotional exhaustion (EE) in head nurses was 24.56 ± 10.64, depersonalization (DP) was 8.92 ± 4.17 and personal accomplishment (PA) was 35.55±13.08, all stating moderate burnout. Meanwhile, the scores of EE and DP were negatively correlated with professional practice environment (r=-0.350--0.161, P≤0.01), while the PA was positively correlated with professional practice environment (r=0.078- 0.271, P≤0.01). Conclusions Professional practice environment in head nurses is correlated with job burnout. Hospital leaders should pay more attention to head nurses′professional practice environment to decrease job burnout in head nurses.

Objective To assess the diet quality of pregnant women during the second trimester using the dietary inflammatory index ( DII) and to explore the correlation between the DII in second trimester of preg-nancy and preterm delivery.Methods A total of 253 women with singleton pregnancy in 16-20 gestational weeks who had received routine prenatal care between August 2014 and April 2015 at the First Affiliated Hospi-tal of Anhui Medical University were enrolled with cluster random sampling.The included women were asked to recall daily dietary intake in the 3 days prior to the survey.All dietary data were analyzed for energy and nutri-ents intake with a nutritional analysis software, followed by calculation of DII according to previous reports. Based on quartiles of the DII scores, the participants were divided into three groups, namely the anti-inflam-matory group (DII<-5.10), intermediate group (DII -5.10--2.55), and the pro-inflammatory group (DII>-2.55).The participants were followed up until delivery and the pregnancy outcomes were recorded. The relationship between the DII in second trimester of pregnancy and preterm delivery were analyzed. Results DII scores of the 253 pregnant women during the second trimester of pregnancy ranged from -7.913 to 3.872.The risks of preterm birth in the anti-inflammatory diet group, the intermediate group, and the pro-inflammatory diet group were 0, 1.6%, and 6.3%, respectively, with statistically significant differences among the groups (P=0.034).The higher DII scores (pro-inflammatory) were associated with higher inci-dence of preterm birth ( P<0.05 ) .Conclusion DII may be used to assess diet quality of pregnant women during the second trimester and to predict the risk of preterm birth.

Objective To investigate the training expectations and training strategies of orthopedic clinical specialist nurses (OCSN).Methods Totally 5 020 orthopedic nurses from 342 hospitals from 30 provinces and cities were selected bv convenience sampling.Participants were investigated hy WeChat platform with self-designed questionnaire.Results A total of 4 982 effective questionnaires were collected.Among investigated nurses,13.7％ of them received orthopedic specialist nurses training;91.4％ believed that training should be carried out.Qualifications should be:college degree and above,senior nurse and above,at least 3 ～5 years of nursing experience,1～3 years of nursing experience in orthopedic department.For curriculum,public courses expected to be arranged were communieation skills,nursing teaching,nursing management,and nursing research;expected professional courses were functional exercises,pain management,extremity injury nursing,common treatment techniques in orthopedic department,traction nursing,and position nursing.It was suggested that training was divided into subspecialties and off-duty;classroom teaching,teaching rounds,case discussion and experience exchange were expected training methods;"theory-practice-theory-practice" was most preferable traiuing mode.The preferred teachers were orthopedic doctors,orthopedic head nurses,orthopedic specialist nurses,and senior orthopedic nurses.The length of training was expected to be three months,time for clinical practice should be greater than or equal to theoretical teaching,and the practice bases should be tertiary hospitals.Evaluation should be performed before completion,recertification could be later than completion,and the interval time of recertification should be within 5 years.Conclusion Training needs of orthopedic nurses for OCSN are strong.Training expectations(contents,length,modes and teachers) of orthopedic nurses should be considered when designing systematic training program on OCSN.

Objective: To analyze the trend of percentile changes in body composition among children and adolescents aged 7 to 18 by gender and age, and to provide a scientific basis for reference value. Methods: A stratified cluster random sampling method was used to select 1 585 children and adolescents from September to December 2020. Use the GAMLSS to estimate the P 25 , P 50 and P 75 percentile value of gender, age specific body fat percentage (BF%), fat mass index (FMI) and fat free mass (FFM). Results: In different age groups, body fat percentage of boys with normal nutritional status peaked at around 10-year old, among them, body fat percentage of 10-year old P 25 , P 50 and P 75 were 22.2%, 26.1% and 30.1%, respectively. Body fat percentage of obese boys was at a high level. Among girls, body fat percentage under different nutritional status did not change. With the increase of age, fat mass index plateaued slightly in normal and overweight boys. However, in obese boys, with the increase of age, FMI gradually increased with the increase of percentile, while the value of FMI gradually decreased in girls. Whether in boys or girls, with the increase of age, fat free mass index shows an increasing trend, and boys increase faster. Conclusion Under different nutritional status, there are differences in the percentile value of body fat percentage, fat mass index and fat free mass by gender and age, which can provide a scientific basis for reference value of body composition in children and adolescents.

Head and neck squamous cell carcinoma (HNSCC), as the most common type (>90%) of head and neck cancer, includes various epithelial malignancies that arise in the nasal cavity, oral cavity, pharynx, and larynx. In 2020, approximately 878 ‍ 000 new cases and 444 000 deaths linked to HNSCC occurred worldwide (Sung et al., 2021). Due to the associated frequent recurrence and metastasis, HNSCC patients have poor prognosis with a five-year survival rate of 40%-50% (Jou and Hess, 2017). Therefore, novel prognostic biomarkers need to be developed to identify high-risk HNSCC patients and improve their disease outcomes.
Biomarkers, Tumor/genetics* ; Head and Neck Neoplasms/genetics* ; Humans ; Kaplan-Meier Estimate ; RNA ; Squamous Cell Carcinoma of Head and Neck ; Survival Analysis ; Survival Rate