Bacteria ; classification ; growth & development ; Candida ; growth & development ; Humans ; Infant ; Infant, Newborn ; Mouth ; microbiology

OBJECTIVETo evaluate the effect of taper and inserting angle on stability of micro-implants in type II bone and to provide theoretical evidence for clinical selection of taper and inserting angle.

METHODSThree-dimensional finite element models of type II bone sections and micro-implants were fabricated. They were designed using different tapers (diameter between 1.1 to 1.6 mm, taper between 0 to 0.0625) and different inserting angles ranging from 30 degrees to 90 degrees (30 degrees, 45 degrees, 60 degrees, 75 degrees, 90 degrees). Effects on the maximum von Mises stresses in mandible and micro-implants, as well as on the maximum displacements in micro-implants, were analyzed under an applied 2 N horizontal force.

RESULTSThe inserting angle had a significant effect on stresses and displacements, with lower distribution of stresses and displacements occurring at 60 degrees. The effect of the taper was also related to the inserting angle. The minimum stresses were 5.013 4 MPa (cortical bone) and 25.1310 MPa (micro-implant) in model D at 60 degrees. The displacements of micro-implants were proportional to the taper.

CONCLUSIONThe inserting angle has a significant effect on stability of micro-implants, and the recommended inserting angle is 60 degrees. The influence of taper on the stability of micro-implants is related to the inserting angle. The micro-implant with 0.0375 taper (maximum diameter is 1.6 mm, minimum diameter is 1.3 mm) is more suitable for type II bones.

Objective To analyze the MRI features of Ewing sarcoma/peripheral primitive neuroectodermal tumors(pPNETs) arising from the meninges.Methods The MRI imaging of 9 patients with Ewing sarcoma/pPNET were reviewed retrospectively,and imaging features and pathological characteristics were analyzed.Results The age of most patients ranged from 10 to 20 years.Magnetic resonance revealed a spindle-like lesion with a wide base in 8 cases.The lesions showed heterogenous iso-or hypo-intense signal on T1 WI in 7 cases,heterogenous hypo-iso-intense signal on T1 WI in 2 case,and iso-or mildly hypderisointense on T2WI in all cases.The solid part of the tumor was heterogeneously enhanced after injection of gadolinium with cyst degeneration or necrosis.The dural tail sign could be seen in 3 cases.The adjacent skull erosion could be seen in 6 cases.The breakthrough of the plate of cranium and soft-tissue invasion was present in 2 cases.The right eye proptosis was present in 1 case.The distant metastasis was found in 3 cases.Pathology showed that the lesions had high cell density.Hemorrhage and necrosis could be observed.The cells were like lymphocytes and spindle cells with transparent cytoplasm.CD99 and Vimentin were expressed in all tumor cells.Conclusion The imaging findings of the meningeal pPNET are different from meningiomas,which could be useful for the diagnosis and differential diagnosis.

Strong inhibition of Bacillus subtilis strain NJ-18 on mycelia growth of Alternaria solani was observed in the antagonistic tests by cylinder plate methods, and the inhibition width was 21.5 mm. Observation under microscope found that the supernatant of fermentation from NJ-18 could make the pathogen hyphae cells malformed and swelled, and consequently the growth of the pathogen was inhibited. Determining of the colonization in potato plants by the signed rifampicin-resistance in NJ-18 showed that it could colonize well in the plants, the colonization quantity of NJ-18 in the root and stem of the potato detected 30 days after fermentation irrigation was 103 CFU/g plant’s fresh weight. In pot experiment, we inoculated the tomato plants with the spore suspensions of Alternaria solani after spraying the fermentation of NJ-18, the results were investigated in 14 days and the efficacy in controlling the disease was 72.9%, which was significantly higher than 45.7%, the efficacy resulted from spray treatment of 2000 fold dilution of 50% iprodione wetable powder.

Objective To observe the clinical efficacy of acupuncture plus He-Ne laser irradiation in treating cervical spondylotic radiculopathy (CSR) and to provide evidence for optimizing the treatment protocol. Method Totally 120 CSR patients were randomized into group A, group B, and group C, 40 in each group. Group A was intervened by acupuncture plus He-Ne laser irradiation, group B was by acupuncture alone, and group C was by the laser irradiation alone. The CSR rating scale was adopted for observation before and after intervention, and the therapeutic efficacy was also evaluated.Result The CSR rating score was changed significantly in all of the three groups after intervention (P<0.05). The change of CSR rating score in group A was significantly different from that in both group B and C (P<0.05). The total effective rate was 97.5% in group A, versus 92.5% in group C and 80.0% in group C, and the total effective rate of group A was significantly different from that in both group B and C (P<0.05).Conclusion Acupuncture plus He-Ne laser irradiation is an effective method in treating CSR.

Objective To explore the insertion of the teaching contents of nursing in rural doctors'higher education,so as to increase their understanding of medical knowledge and improve their medical skills.Method 90 rural doctors of Grade 2014 were chosen as the research object,and according to their willingness to participate,they were divided into control group and observation group.The students in the control group were mainly taught by the relevant knowledge of clinical medicine,while nursing teaching content was inserted in the teaching of observation group.In the teaching process,firstly,the teaching contents of nursing were reorganized,and then the teaching content of clinical medicine was taken as the main line,according to the development of teaching content,flexibly inserting nursing teaching part.The results of the final examination of the internal medicine of the two groups were compared and the specific learning experience of rural doctors was investigated.SPSS 20.0 was used to analyze the data,the count data was expressed as percentage,and chi square test was performed.Results The number of students in the control group and the observation group whose subjective score was more than 40 was 17.65％ and 48.72％ respectively.The number of students scoring ＜30 points accounted for 23.53％ and 5.13％ of the total number of students,and there was a statistically significant difference between the two groups(P＜0.05).The observation group had a better learning experience,and had little influence on the learning of clinical medical knowledge.Conclusion In the stage of education for rural doctors,inserting the teaching contents of nursing can improve the teaching effect.

Objective: To investigate the level of arsenic exposure in rural drinking water and to assess the health risk caused by exposure to arsenic in Tongzhou District, Beijing Municipality in 2019, so as to provide insights into improving the quality of rural drinking water. Methods: Water samples were collected from self-provided wells in 196 villages of 7 townships in Tongzhou District from April to June, 2019, and the arsenic levels were measured in drinking water according to Standard examination methods for drinking water-Metal parameters (GB/T 5750.6-2006). The carcinogenic and non-carcinogenic risks of arsenic were evaluated in drinking water using the environmental risk assessment model recommended by the United States Environmental Protection Agency (EPA). Results: Totally 520 water samples were collected, and the median arsenic concentration was 0.001 2-0.050 0 mg/L. There were 67 water samples with arsenic levels exceeding the defined standard level (12.88%), and the proportions of arsenic levels exceeding the defined standard level were 57.69%, 17.24%, 12.20%, 6.52% and 1.31% in Songzhuang, Huoxian, Lucheng, Zhangjiawan and Yongdedian townships, and the arsenic levels did not exceed the defined standard level in Majuqiao or Taihu townships. The carcinogenic risk of arsenic was 3.135 7×10-4/a in drinking water, which exceeded the maximum acceptable risk, and the carcinogenic risk of arsenic all exceeded the maximum acceptable risk, with the highest value seen in Songzhuang Township (9.648 2×10-4/a). A high carcinogenic risk of arsenic was seen in men at ages of 60 to 80 years (3.012 8×10-4/a) and in women at ages of 80 years and older (2.949 0×10-4/a). The non-carcinogenic risk of arsenic was 0.696 8 in drinking water, indicating a low risk, and were 1.009 5 and 2.144 1 in Huoxian and Songzhuang townships, indicating a high risk. In addition, a high non-carcinogenic risk of arsenic was seen in men at ages of 60 to 80 years (0.669 5) and in women at ages of 80 years and older (0.655 3). Conclusion There was a high proportion of arsenic levels exceeding the defined standard level in rural drinking water in Tongzhou District, 2019, and there was a health risk, notably with the highest carcinogenic risk seen in residents at ages of 60 years and older. Effective interventions are needed to reduce arsenic levels in drinking water.

Objective To explore the clinical characteristics of mycoplasma pneumonia with pulmonary atelectasis and lavage interventional effect through fiberoptic bronchoscopy in children.Methods During Jun 2012 to Apr 2013,fifty-three children diagnosed of mycoplasma pneumonia with pulmonary atelectasis who received fiberoptic bronchoscopy were enrolled as the experimental group.Thirty-five children diagnosed of mycoplasma pneumonia without pulmonary atelectasis were chosen as control group.According to the lavage interventional time of fiberoptic bronchoscopy,we divided the patients in the experimental group into two groups,the early group and late group.Clinical data and laboratory finds were collected and analyzed.Results The duration of fever,hospital stay and C-reactive protein (CRP) of the experimental group were significantly higher than those of the control group (P ＜ 0.05).The location of pulmonary atelectasis in the experimental group were usually in the right middle lobe (18 cases,33.9％).Under fiberoptic bronchoscope,all patients had obviously bronchial mucosa congestive edema.Some of them had follicular hyperplasia (9 cases,17.0％),mucosal erosion (3 cases,5.7％),mucus plug formation (7 cases,13.2％) and poor ventilation of segmental bronchi (4 cases,7.5 ％).Neutrophils (43 cases,81.1％) increased and phagocytic cells (31 cases,58.5％) dereased obviously in bronchoalevolar lavage fluid.After treatment in the experimental group,52 children (98.1％) got complete recruitment of atelectasis.The average duration of fever and hospital stay of the early group were significantly shoter than those of late group (P ＜ 0.05).Conclusion Children diagnosed of mycoplasma pneumonia with pulmonary atelectasis had longer fever duration and higher CRP level.Bronchoscopic interventional therapy promoted the recovery of pulmonary atelectasis.Using bronchoscop early in shorten the duration of fever and hospitalization in children diagnosed of mycoplasm pneumonia with pulmonary atelectasis.

Objective To study the clinical effect, safety of stains collapse of traditional Chinese medicine (TCM) combined with tumor necrosis factor-alpha (TNF-α) antagonist-a recombinant human tumor necrosis factor receptor:Fc fusion protein (rhTNF:Fc) and sulfasalazine (SSZ) in treatment of active ankylosing spondylitis (AS). Methods A total of 98 patients of AS of Gansu Provincial Hospital were divided into two groups in random, the western medicine group (rhTNF:Fc and SSZ, n=46) and the combining group (stains collapse of TCM, rhTNF:Fc and SSZ, n=52). The Bath Ankylosing Spondylitis Disease Activity Index (BASDAI), the Bath Ankylosing Spondylitis Functional Index (BASFI), Patient Global Assessment (PGA), Visual Analogue Scale (VAS) of night pain, VAS of total pain, time of morning stiffness, TCM symptom score, distance between occipital and wall, distance between finger and ground,
thoracic activity, Schober test, and erythrocyte sedimentation rate (ESR), C reactive protein (CRP), adverse reactions before and after treatment were observed and the clinical effect was evaluated in two groups. Results A total of 86 patients achieved the study finally, 45 patients in the combining group and 41 patients in the western medicine group. The effective rate of ASAS20 was better in the combining group than that in the western medicine group(χ2=4.814,P=0.028), the Bath ankylosing spondylitis disease activity index (BASDAI) 50 showed no significant difference between the two group (χ2=0.100,P=0.752). The total effective rate in the combining group than that in the western medicine group(χ2=3.873,P=0.049). In comparison with the same group before treatment, the above indicators were improved after treatment (P<0.05). In comparison with the western medicine group after treatment, BASFI, PGA, VAS of night pain, VAS of total pain, time of morning stiffness, TCM symptom score, distance between occipital and wall, distance between finger and ground and Schober test were getting better in the combining group (P<0.05), but BASDAI, thoracic activity, ESR, CRP were not improved in the combining group (P>0.05). The adverse reactions showed no significant difference (P>0.05). Conclusions Stains collapse of TCM combined with rhTNF:Fc was more effective than single method in treatment of AS, it can alleviated the symptoms, body signs and body function, decrease indexes of inflammation, which has dramatic effect and good safety in clinic.

Objective To evaluate the efficacy of Lianhua Dingchuan Tablets in bronchial asthma.Methods Fifty BALB/C mice were randomly and equally divided into control (Con) group,ovalbumin (OVA) group,dexamethasone (DEX) group,high-dose Lianhua group,low-dose Lianhua group.The mice were sensitized and challenged with OVA plus aluminium hydroxide to establish asthmatic model and were pre-treated 30 minutes before challenge.Specific airway resistance (sRaw) was used to evaluate airway hyperresponsiveness,and airway inflammatory changes were measured.ELISA and Magnetic Luminex(R) were used to quantified the levels of IL-4,IL-13 and INF-γ.Results Airway resistance significantly decreased in DEX group and High-dose Lianhua group (P＜0.05).Levels of inflammatory cells and IL-13 in BALF evidently reduced in DEX group,high-dose Lianhua group and low-dose Lianhua group (P ＜ 0.05),while IL-13 level in serum only decreased in DEX group.There was no significant changes in the levels of IL 4 and INF γ among those groups.Conclusions Lianhua Dingchuan Tablets might relieve the symptoms of asthma by reducing IL-13 level and inhibiting the airway inflammation.