Objective:To evaluate the occluding effect of 2 kinds of Er laser on dentinal tubules.Methods:27 dentine discs were prepared,etched with 0.5 mol/L EDTA and then divided into 3 groups(n =9).The samples in group A without treatment were used as the controls,in group B treated with Er:YAG laser irradiation and in group C treated with Er,Cr:YSGG laser irradiation.The occluding effect was examined by scanning electron microscopy (SEM).Results:Micrographs of SEMshowed obvious occluding effect in group B and C.The dentinal tubule exposure rates of group A,B and C were 33.61 0% ±7.545%,4.1 86% ±0.723% and 3.798% ± 0.843% respectively(among 3 groups,P <0.01 ;B vs C,P >0.05).Conclusion:The 2 kinds of Er laser can block dentinal tu-bules.

ObjectiveTo investigate the effects of lipopolysaccharide (LPS) on mRNA expression of iron metabolism related genes. Methods Ten male mice (2 months) were injected intraperitoneally with lipopolysaccharide(0.5 μg/g). After 6 hours, mice were sacrificed and then sera, liver and spleen were collected. The mice blood routine was measured. The serum iron and total iron binding capacity (TIBC) were determined with reagent kit. The quasi-quantitative reverse transcription polymerase chain reaction (RT-PCR) was performed for mRNA of hepatic hepcidin(HP), ferroportin1(Fpn1), transferrin receptor 1(TfR1) and spleenic HP, Fpn1 and interleukin-6(IL-6). Results The serum iron and TIBC were reduced in mice injected LPS, which exhibited mild anemia(P＜0.05) . LPS can increase the expression of hepatic hepcidin and decrease Fpn1 and TfR1 in liver after LPS administration 6 hours(P＜0.05). In spleen, IL-6 was upregulated and Fpn1 downregulated(P＜0.05). Conclusion LPS can influence serum iron through regulating the mRNA expression of hepatic and spleenic iron metabolism related genes, such as HP, Fpn1 and TfR1.

Blood C-peptide,first-void fasting urinary C-peptide/creatinine ratio ( UCPCR ),second-void fasting UCPCR,and 24 h urinary C-peptide (UCP) were determined in 90 type 2 diabetics and 30 health volunteers.The results showed that first-void fasting UCPCR and second-void fasting UCPCR were positively related to 24 h UCP and the index of islet β-cell function( all P＜0.01 ).

Objective To investigate the effect of the balloon Bionic midwifery on the delivery outcomes and to analyze the clinical value.Methods 1 683 parturients from June 2014 to May 2015 were selected.They were randomly divided into observation group (832 cases,applied balloon Bionic Midwifery) and control group 851 cases.We compared the labor,the postpartum hemorrhage,the outcomes of pregnancy and the rate of survival of neonates of the two groups.Results The first and second stage as well as the total stage of labors of the observation group were lower than the control group (P＜0.01);Also,the rate of cesarean delivery and the hemorrhage together with the asphyxia of neonates were lower than the control group (P＜0.01).However,the rate of vaginal delivery was higher than the control group (P ＜0.05).The differences between them had a great statistical significance.Conclusions The balloon bionic midwifery technology has an advantage in reducing the rate of cesarean delivery and the maternal pain of pregnant women as well as the maternal complications.It is an effective and safe midwifery technology.So it has a great value of spreading in clinical trials.

Objective To explore the path of subjective well-being, perceived social support and professional commitment among undergraduate nursing students. Methods A total of 207 undergraduate nursing students in a medical university in Anhui were recruited by cross-sectional survey method. Nursing students were investigated using General Information Questionnaire, Index of Well-being, Perceived Social Support Scale, Professional Commitment Scale during October to November 2016. SPSS 16.0 was used for statistical analysis, the data were analyzed by t test or variance analysis;Multivariate analysis was performed by multiple linear regression, and AMOS 17.0 was used for mediation analysis. Results The professional commitment score for nursing students was (88.01 ±10.94); perceived social support and subjective well-being were positively correlated with professional commitment (r=0.349-0.413, P=0.000); nursing role, pro-fessional interest, perceived social support, subjective well-being can positively predict professional commit-ment (β=0.157, 0.324, 0.210, 0.220), motivation can negatively predict professional commitment;path analysis showed that perceived social support played a partial mediating role between subjective well-being and pro-fessional commitment. Conclusion The professional commitment were related to subjective well-being and perceived social support, and perceived social support plays a partial mediating role between subjective well-being and professional commitment among nursing students. Nursing educators can understand social support and subjective well-being as the breakthrough point, which actively formulate intervention strategies to enhance the professional commitment, stabilize the development of nursing team, and improve the quality of nursing.

Electrophysiological Phenomena ; drug effects ; Humans ; Hydrocarbons, Brominated ; toxicity ; Occupational Exposure ; adverse effects

OBJECTIVETo investigate the distribution of rubidium (Rb), cesium (Cs), beryllium (Be), strontium (Sr), and barium (Ba) in blood and urine in general Chinese population.

METHODSA total of 18 120 subjects aged 6~60 years were enrolled from 24 regions in 8 provinces in Eastern, Central, and Western China from 2009 to 2010 based on the method of cluster random sampling. Questionnaire survey was conducted to collect the data on living environment and health status. Blood and urine samples were collected from these subjects, and the levels of Rb, Cs, Be, Sr, and Ba in these samples were determined by inductively coupled plasma mass spectrometry. The distribution of these elements in blood and urine in male or female subjects living in different regions was analyzed statistically.

RESULTSIn the general Chinese population, the concentration of Be in the whole blood was below the detection limit (0.06 μg/L); the geometric mean (GM) of Ba in the whole blood was below the detection limit (0.45 μg/L), with the 95th percentile (P95)of 1.37 μg/L; the GMs (95% CI)of Rb, Cs, and Sr in the whole blood were 2 374(2 357~2 392) μg/L, 2.01 (1.98~2.05) μg/L, and 23.5 (23.3~23.7) μg/L, respectively; in males and females, the GMs (95%CI)of blood Rb, Cs, and Sr were 2 506 (2 478~2 533) μg/L and 2 248 (2 227~2 270) μg/L, 1.88 (1.83~1.94) μg/L and 2.16 (2.11~2.20) μg/L, and 23.4 (23.1~23.7) μg/L and 23.6 (23.3~23.9) μg/L, respectively(P<0.01, P>0.05, and P>0.05). In the general Chinese population, the GM of urine Be was below the detection limit (0.06 μg/L), while the GMs (95%CI)of urine Rb, Cs, Sr, and Ba were 854 (836~873) μg/L, 3.65 (3.56~3.74) μg/L, 39.5 (38.4~40.6) μg/L, and 1.10 (1.07~1.12) μg/L, respectively; in males and females, the GMs (95%CI)of urine Rb, Cs, Sr, and Ba were 876 (849~904) μg/L and 832 (807~858) μg/L, 3.83 (3.70~3.96) μg/L and 3.47 (3.35~3.60) μg/L, 42.5 (40.9~44.2) μg/L and 36.6 (35.1~38.0) μg/L, and 1.15 (1.12~1.19) μg/L and 1.04 (1.01~1.07) μg/L, respectively (all P< 0.01). Correlation analyses showed that there were weak correlations between blood Rb and urine Rb (r=0.197)and between blood Sr and urine Sr (r=0.180), but a good correlation between blood Cs and urine Cs (r=0.487).

CONCLUSIONThe levels of Rb, Cs, Be, Sr, and Ba in the general Chinese population are similar to those reported in other countries, and there is a significant difference in the concentration of each element among the populations living in different regions, as well as significant differences in blood Rb, urine Rb, urine Cs, urine Sr, and urine Ba between males and females.

Adolescent ; Adult ; Barium ; blood ; urine ; Beryllium ; blood ; urine ; Cesium ; blood ; urine ; Child ; China ; Female ; Humans ; Limit of Detection ; Male ; Middle Aged ; Rubidium ; blood ; urine ; Strontium ; blood ; urine ; Young Adult

Objective: To analyze the rule and characteristics of school food poisoning incident in Guizhou Province during 2011-2018. Methods: Data of school food poisoning incidents were collected from the Foodborne Disease Outbreak Surveillance System in Guizhou Province during 2011-2018 and statistically analyzed. Results: A total of 78 cases of food poisoning occurred in schools in Guizhou Province during 2011-2018. Among the 1 506 cases, 869 hospitalized and 1 died. May was peak time for school food poisoning. Most of the incidents (83.33%, 65/78) occurred in the school canteens. Plant origin products (50%, 39/78), especially spoiled rice, were the most common types of food poisoning in school(16.67%, 13/78). Conclusion Primary and secondary school students were the largest group for school food poisoning in Guizhou province. It was necessary to strengthen the supervision and management of school canteens and surrounding places, as well as to improve the food safety awareness of food operators and students, preventing similar incidents from happening again.

Objective: To evaluate the performance of multiplex polymerase chain reaction-based reverse line blot hybridization (mPCR/RLB) in the detection of pathogens causing neonatal bacterial meningitis and associated drug resistance genes. Methods: Clinical data and cerebrospinal fluid (CSF) samples were collected retrospectively from 80 cases diagnosed with neonatal bacterial meningitis in Beijing Children's Hospital from January 1, 2012 to December 31, 2018. A total of 100 CSF samples were obtained including 80 samples collected after admission (12 before and 68 after antibiotic treatment) and 20 recollected at follow-up. All CSF samples were analyzed by conventional culture, susceptibility test and mPCR/RLB. Differences in the detection of pathogens and drug resistance genes were analyzed by Chi-square test. Results: (1) Among the 80 first-collected CSF samples, mPCR/RLB revealed significantly higher positive rate than conventional culture [26.3% (21/80) vs 7.5% (6/80), χ²=10.025, P=0.002]. No significant difference was showed between the two methods in analyzing the 12 samples collected before antibiotic therapy (9/12 vs 5/12, χ²=1.543, P=0.214), while the positive rate in 68 samples collected after antibiotic intervention detected by mPCR/RLB was obviously higher than that by conventional culture [17.6% (12/68) vs 1.5% (1/68), χ²=13.176, P<0.001]. (2) Conventional culture results of the 20 samples collected during follow-up were all negative, but four were positive using mPCR/RLB, which were also positive previously. Furthermore, the results of both methods in previous detections were identical. (3) According to the conventional culture results, the pathogens were Escherichia coli (three cases), Group B Streptococcus (two cases) and Listeria monocytogenes (one case), while mPCR/RLB detected Escherichia coli (four cases), Group B Streptococcus (five cases), Listeria monocytogenes (four cases), Neisseria meningitidis (four cases), Haemophilus influenzae b (one case), Gram-negative bacteria (one case), Gram-positive bacteria (one case), and Listeria monocytogenes and Haemophilus influenzae b coinfection (one case) in 80 first-collected CSF samples. (4) Antibiotic susceptibility test showed that one Escherichia coli strain produced extended spectrum beta-lactamases. Drug resistance gene detection by mPCR/RLB showed that acrA, acrB, CTX-M (consistent with antibiotic susseptibility test) and TetM genes were positive in three, two, one and one case, respectively. Conclusions mPCR/RLB is of great clinical value due to its higher detection rate and better accuracy compared with bacterial culture and can also detect drug resistance genes.

Objective: To analyze the epidemiological characteristics, clinical manifestations and imaging charac-teristics of 76 cases with neonatal cerebral infarction, in order to provide evidence for the diagnosis, treatment and prognosis for neonal cerebral infarction. Method: Newborns with cerebral infarction admitted into the Neonatal Center, Beijing Children′s Hospital, Capital Medical University from January 2007 to December 2017 were enrolled.According to neurological sequelae, the participants were divided into good prognosis group and poor prognosis group for retrospective analysis, and their cranial magnetic resonance imaging(MRI) changes and mental development were followed up. Results: The incidence of convulsion was the highest in 76 cases (73.7%, 56/76 cases), among which unilateral limb twitching was characteristic in 39.2% (22/56 cases). Clinical physical examination showed no significant positive signs in 13.2%(10/76 cases) of the patients, but middle cerebral artery involvement accounted for 80.3% (61/76 cases), and there was no abnormal discharge of electroencephalogram in 29.2% (19/65 cases) of the patients.Among 41 children (29.3%) received follow-up, 12 cases had neurological sequelae, and 15 cases (36.6%) received anticoa-gulant therapy.The median area of original damage of T2 sequence cerebral infarction was 10.3%, the median area of diffusion weighted image damage was 2.0%, and the median area of damage of T2 sequence was 1.0%.The median ratio of craniocerebral lesion damage was 8.4%.The ratios of poor prognosis were 14.9%, 4.8%, 0.5% and 14.4%, respectively. Conclusions Neonatal convulsion is the most common manifestation of neonatal cerebral infarction.Unilateral limb clonus is characteristic.The larger the infarct involvement area and the larger the intracranial lesion change area through reexamination, the poorer prognosis of the children.Early anticoagulant therapy could not improve the prognosis of neonatal cerebral infarction.