Objective To discuss the value of DTI on recovery of white matter injury in periventricular leucomalacia (PVL) with cerebral palsy after surgery.Methods 15 childrens suffered from PVL and 15 age-matched normal controls with normal MRI findings and no neurological abnormalities were recruited in this study.Conventional plain MRI scans and DTI sequence of brain were preformed in all subjects.FA maps of eight selected regions,which included the corpus callosum genu,splenium of corpus callosum,bilateral anterior limb of internal capsule,bilateral posterior limb of internal capsule,bilateral optic radiation,bilateral cerebral pedunculusand superior longitudinal fasciculus were compared between two groups.Results Significant differences of FA values were observed among the three group before and after the treatment and control groups(P＜0.05).FA value of the caudate nucleus and lenticular nucleus among three group was not statistically significant difference.Further pairwise comparison,FA values of the posterior limb of internal capsul,genu of corpus callosum and splenium of corpus callosum in three groups showed statistically significant differences,there was no statistically significant difference for FA value of the genu of capsulae internae,cerebral peduncle and pons among the three group.Compared to the contralateral normal areas,FA value of the genu of capsulae internae,cerebral peduncle and pons showed statistically significant differences (P＜0.05).Conclusion Quantitative DTI may show subtle changes in the structure of white matter,which has a certain reference value of FA values of white matter in periventricular leucomalacia with cerebral palsy after surgery,and help clinicians further reasonable treatment.

Objective To investigate the current status of nurses′ work performance and job involvement, and to analyze the impact of nurses′job involvement on work performance. Methods Self-made questionnaires were used to investigate 309 nurses in a 3A military hospital in Beijing. The military hospital is in a high standardization level, which may be properly representative of both military hospitals and 3A hospitals. Results The total score of nurses′work performance was 192.04 ± 31.25. The total score of nurses′ job involvement was 55.48 ± 9.94. The multiple regression analysis showed that the nurses′ work performance would be influenced by staff type, vigor and absorption. Conclusions The nurses′work performance and job involvement were at a high level. Managers should take methods to keep a high level of nurses′job involvement, which may improve work performance.

Objective:To study performed of develop a mice model of allergic diseases induced by crude extractings from populus pollen.Methods: A total of 60 BALB/c mice were divided randomly into there groups:normal control group,Albumin Egg(OVA) group and populus pollen model group with 20 in each.Mices were repeatedly sensitized by intraperitoneal injections of OVA or crude populus pollen extract every 5 d for four doses.Five days after the last sensitization,mices were repeatedly challenged by once daily antigen from 21-25 d.The changes of inflammatory cells in bronchoalveolar lavage fluid(BALF) were stained with hematoxylin and eosin(HE) to evaluate the degree of allergic inflammation.PAS staining was used to observe the secretion of airway mucus;The changes of the nasal mucosas and lungs of mice were stained with HE to evaluate the degree of allergic inflammation.And the average optical density of IL-4 and IFN-γ positive cells in lung tissue was measured by immunohistochemistry.The total IgE in the serum was also measured by enzyme-linked immunoassay(ELISA).Results: Compared with the mice in normal control group,those in OVA group and model group developed obvious allergic inflammation in the nasal mucosas and lungs,and increased airway mucus secretion.The number of inflammatory cells including eosinophil and neutrophils markedly increased in BALF smear.The average optical density of IL-4 positive cells in lung tissue was all increased in OVA group and model group compared with those in normal control group,and the average optical density of IFN-γ in lung tissue was on the contrary.The total IgE in the serum were all increased in OVA group and model group compared with those in normal control group,and the IFN-γ in the serum was significantly reduced in OVA group and model group compared with those in normal control group.Conclusion: Taken together,crude populus pollen extract can successfully induce a mice model of allergic diseases.This model is a useful tool in studying the mechanisms of allergic disease.

Objective To study miRNA expression differences in ovalbumin(OVA)- induced murine asthma models of mice and mast cells stimulated by inflammatory cytokines stimulation,and to better understand asthma deve-lopment so as to provide potential target for its prevention and treatment. Methods OVA - induced murine asthma models were validated by detecting cells in bronchoalveolar lavage fluid(BALF)and histopathology. And miRNA ex-pression differences in the lung tissues between the model group and the normal control group were detected by real -time polymerose chain reaction PCR . After tumor necrosis factor - α(TNF - α),interleukin 12(IL - 12)stimulation, miRNA expression differences in murine mast cells P815 were detected. Results The number of total cells and eosino-phil cells both increased in BALF of the model group[(12. 8 ± 2. 2)x 107 / L vs(5. 6 ± 2. 5)x 107 / L,t = 4. 760,P ﹤0. 05;(6. 6 ± 1. 9)x 107 / L vs(0. 8 ± 0. 8)x 107 / L,t = 8. 068,P ﹤ 0. 05]. In addition,histopathology showed more inflammatory cell infiltration in the model group than that in the normal control group,indicating that the models were validated. The expression of miRNA - 155 was up - regulated approximately 5. 0 - fold in the lung tissues of the model group(P ﹤ 0. 05),while miRNA - 192 showed no differences compared with the controls. After TNF - α and IL - 12 stimulated P815 mast cells,miRNA - 192 expressions in P815 were expression in P815 was up - regulated approximate-ly 1. 9 - fold and 1. 7 - fold after TNF - α and IL - 12 stimulation,respectively(P ﹤ 0. 05). Conclusions It is conclu-ded that miRNAs are differentially expressed in the presence of OVA - induced murint asthma models and mast cells stimulated by inflammatory cytokines. These differentially expressed miRNAs may regulate the function of mast cells and involved in the pathogenesis of asthma.

Objective To investigate the clinical diagnostic values of quantitative DTI and MRS in AIDS-related cerebral tuberculosis. Methods 17 cases confirmed with AIDS and brain tuberculosis,16 volunteers were recruited to perform routine MRI,DTI and MRS sequences. Morphological characteristics of lesions were observed.ADC,FA,rADC,rFA,NAA/Cho,NAA/Cr and Cho/Cr of the lesions solid areas,edematous areas,normal areas and contralateral corresponding normal areas were measured and their variances in different areas were analyzed. Results Significant differences of the values were observed among the three regions of AIDS-related brain tuberculosis,the results of multiple comparisons between the three areas had statistical significances (P <0.05)excepted NAA/Cr between edematous and contralateral areas.ADC,FA,rADC,rFA,NAA/Cho,NAA/Cr on solid areas were lower than that on edematous areas,Cho/Cr on solid areas was higher than that on other two areas.The diagnostic efficiency of rFA value to distinguish solid and edematous areas was the highest by ROC analysis(P <0.05).The normal areas of the two groups had statistical significances(P <0.05)excepted Cho/Cr.Conclusion DTI is valuable to display the lesions micro-structure changes and MRS can reflect the early pathology metabolites changes of AIDS-related tuberculosis.

Objective:To evaluate the measurement uncertainty in the determination of dexamethasone in cosmetics by ultra per-formance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS). Methods: The uncertainty caused by various factors in the whole determination process was analyzed,including weighing,standard solution preparation,calibration fitting,extraction and de-termination. Results:The combined uncertainty in the determination of dexamethasone in cosmetics was 0.75 μg·g-1and the ex-panded uncertainty was 1.5 μg·g-1. The content of dexamethasone in cosmetics was(20.4 ± 1.5) μg·g-1(k=2,confidence inter-val p=95%). Conclusion:The uncertainty of the method is mainly caused by standard solution preparation and calibration fitting.

Objective To investigate the change rules of the lumbar vertebral bone marrow fat fraction(FF)and T2* values at different bone mineral density(BMD)groups,and their relevances and the applications on the diagnosis of the primary osteoporosis. Methods The patients who underwent the dual energy X-ray absorptiometry(DXA)and the routine lumbar MRI scan,mDIXON-Quant scan were collected,and the BMD,T-score,FF and T2* values of L1-L4 were measured.According to the T-score,the vertebral bodies were divided into the normal group,the osteopenia group and the osteoporosis group.The differences of the FF,T2* values and BMD between each group were analyzed by one-way analysis of variance,and their correlations with BMD were analyzed by Pearson correlation,the diagnostic effects of them were evaluated by receiver operating characteristic curve(ROC curve).Results The differences of the FF ,T2 * values and BMD among the three groups were statistically significant (P < 0 .05) .The correlations of the FF and T2 * values with BMD were negative (r = - 0 .628 ,P < 0 .05 and r = - 0 .468 ,P < 0 .05 ,respectively) .The area under curve (AUC) of the FF and T2 * values were 0 .82 ± 0 .03 ,0 .79 ± 0 .03 ,respectively .Conclusion mDIXON-Quant which can accuratly quantify fat content could evaluate the lumbar vertebral bone marrow fat content ,reflect the changes of the bone quality ,provide valuable information for the diagnosis of osteoporosis ,and is helpful to predict the risks of the lumbar fragility fracture.

Objective To explore the value of diffusion tensor imaging (DTI)for the cerebral white matter recovery in children with cerebral palsy after cervical perivascular sympathectomy.Methods 30 children with hemiplegic cerebral palsy were recruited for clinical assessment and routine MRI and DTI examination before and after operation.The fractional anisotropy (FA)values for the regions including internal capsule and cerebral peduncle in the preoperative operation side and the opposite side,preoperative and postoperative were measured and compared.Gross motor function classification system (GMFCS)was used to evaluate the movement function of cerebral palsy in children.Paired sample t-test was performed to compare the differences of FA values between the preoperative operation side and the lateral,preoperative and postoperative white matter.Spearman relativity analysis was performed to assess correlation between DTI parameters in different white matter fiber bundles and GMFCS in patients.Results The FA values of white matter fiber bundle in different parts of the preoperative operation side were significantly lower in preoperative contralateral side,and the differences were statistically significant(P<0.001).Compared to preoperative,the FA values of white matter fiber bundle in different parts of the operation side were significantly increased in the six months after surgery (P<0.001),with the improvement of gross motor.Preoperative and postoperative FA value of the white matter fiber bundles in the different parts of the contralateral brain was not statistically significant(P>0.05).Clinical GMFCS in the patients were negatively correlated with the FA values (P<0.001).Moreover,the relativity between the GMFCS and the FA value of internal capsule and cerebral peduncle were both higher(r=-0.800,P<0.001;r=-0.786,P<0.001). Conclusion DTI can be used to quantitatively evaluate the postoperative recovery of white matter in children with cerebral palsy.The FA value can be used as a sensitive index for the evaluation of curative effect in children with cerebral palsy.

Objective:To investigate the serotype distribution and phylogenetic analysis of virus complete genome from indigenous dengue patients in Guangzhou in 2019 and provide evidence for the development of prevention and treatment strategies.Methods:Dengue virus serotypes of indigenous dengue cases in 2019 were detected using serotype specific fluorescent PCR kits. Complete genome in the culture was performed on Illumina platform. Phylogenetic analysis was conducted on complete genomes extracted from ViPR and the isolates from this study with MEGA7.0 software.Results:In 2019, three prevalent serotypes of dengue virus were found in Guangzhou, among which serotype 1 accounted for 80.35%, serotype 2 accounted for 12.97% and serotype 3 accounted for 6.68%. There were no significant differences in gender, age and severity among three serotypes. Phylogenetic analysis of virus complete genome showed that serotype 1 belonged to genotypeⅠand had two origins, which was close to the Cambodian strain; serotype 2 belonged to genotype cosmopolitan, which was close to the epidemic strain in Southeast Asia; serotype 3 belonged to genotypeⅢ, which was in the same branch as the Indian strain.Conclusions:The dengue epidemic was caused by dengue virus serotypes 1, 2 and 3 in Guangzhou in 2019. Each serotype belonged to a genotype.