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【Objective】 To assess three severe acute respiratorysyndrome coronavirus 2 (SARS-CoV-2) enzyme linked immunosorbent assays (ELISA) and one pseudotype lentivirus-based neutralization test (ppNAT) in detecting the convalescent plasma antibody levles from COVID-19. 【Methods】 30 COVID-19 convalescent plasma samples were screened for antibodies against SARS-CoV-2 using three kinds of SARS-CoV-2 ELISA reagents and one ppNAT test in Shenzhen. The controls consisted of plasma samples from 32 healthy blood donors in February 2019. The diagnostic efficacy analysis of various SARS-CoV-2 ELISA reagents was performed using real-time fluorescent Polymerase Chain Reaction (RT-PCR). We also analyzed correlation between different immunological reagents and the age, gender, hospitalization, and severity of illness. 【Results】 The positive yielding rate of ppNAT and three kinds of IgG ELISA was higher than that of IgM ELISA. The positive yielding rates of three kinds of IgG ELISA were 100%(30/30), 93.33%(28/30), and 96.67%(29/30) respectively, while the yielding rates in control group were all 0. The positive yielding rate of three IgM ELISAs were 93.33%(28/30), 70%(21/30)and 46.67% (14/30). All the cases from negative control group were negative for IgG and IgM. Pearson correlation coefficient was calculated; there was a strong correlation between ELISA reagent 2 IgG and ELISA reagent 3 IgG (r=0.765, P0.05). 【Conclusion】 In the convalescent plasma with nucleic acid confirmed covid-19, the yielding rates of different IgM antibodies varied greatly. Antibody levels were influenced by age to some extent.
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Objective The expression of chemokine C-X-C motif ligand 13 (CXCL13) within liver in primary biliary cholangitis (PBC) patients is significantly increased, but its origin and mechanism is not clear yet.The study aimed to investigate the expression of CXCL13 in the liver of mice through establishing a mouse model of PBC.Methods C57BL/6 mice were randomly divided into experiment group (n=20) control group(n=10).The mice in the experimental group were intraperitoneally injected with polyriboinosinic polyribocytidylic acid (Poly I:C) while the mice in control group were injected with PBS of the same volume.The level of serum AMA was quantified by ELISA and intrahepatic inflammatory cells were assessed by HE staining.Kupffer cells, liver sinusoidal endothelial cells, and infiltrating lymphocytes in the liver of mice were collected by in situ perfusion enzyme digestion and magnetic bead separation methods.The transcriptional level of intrahepatic CXCL13 in liver tissues and cell subpopulations were detected by qPCR.Results The serum AMA titers of the mice in experiment group increased gradually with the prolonging of modeling time and the positive rates at the 4th, 8th, and 12th week after the first injection of Poly I:C were 5.9%, 52.9% and 76.5% respectively.While the serum AMA titers of the mice in control group were at a lower level through the modeling process, with only 2 mice presenting a little higher level above positive cutoff value at the 12th week.The results of HE staining in liver tissues of both groups showed that there were a great amount of intensely infiltrating inflammatory cells in the mice of experimental group while no inflammatory cell infiltration were found in the mice of control group.The separation purity of Kupffer cells and liver sinusoidal endothelial cells in the mice of experiment group tested by flow cytometry were 76%-80%, 68%-72% respectively.Compared with the CXCL13 mRNA level in Kupffer cells [2.34(0.22-8.64)], the expression levels in liver sinusoidal endothelial cells and infiltrating lymphocytes declined[0.27(0.03-1.64), 0.05(0-0.22), P<0.05].Conclusion The chemokine CXCL13 is predominantly produced by Kupffer cells in the liver of PBC mice established by Poly I:C injection.
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Objective@#To investigate the expression of ERG, Fli-1, CD34, CD31 and factor Ⅷ-related antigen(FⅧRAg) in hepatic malignant vascular tumors.@*Methods@#A retrospective analysis was conducted on 63 cases of primary hepatic malignant vascular tumors and 31 cases of hepatic other malignant spindle cell tumors collected during January 1986 to January 2014. EnVision method was used to detect the expression of ERG, Fli-1, CD34, CD31, FⅧRAg.@*Results@#Sixty-three cases of malignant vascular tumors, including 24 cases of angiosarcoma, 38 cases of epithelioid hemangioendothelioma and 1 case of hepatic Kaposi′s sarcoma. All of the cases were positive for ERG(100.0%, 63/63). Positive rate of Fli-1, CD34, CD31, FⅧRAg was 96.8% (61/63), 87.3% (55/63), 81.0% (51/63) and 41.3% (26/63), respectively. In other hepatic malignant spindle cell tumors, the positive rate of ERG, Fli-1, CD34, CD31 and FⅧRAg was 3.2% (1/31), 19.4% (6/31), 19.4% (6/31), 9.7%(3/31) and 3.2%(1/31), respectively.The sensitivity of ERG, Fli-1, CD34, CD31, FⅧRAg was 100.0%, 96.8%, 87.3%, 81.0% and 41.3%, respectively.The specificity was 96.8%, 80.6%, 80.6%, 90.3% and 96.8%, respectively.@*Conclusion@#ERG is a more sensitive and specific diagnostic marker for hepatic malignant vascular tumors in comparison to Fli-1, CD34, CD31 and FⅧRAg.
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Objective To investigate the incidence and risk factors of urinary incontinence of the adult women in two communities in Kunming so as to obtain basic epidemiological data,draw epidemiological regularity of adult women urinary incontinence in this two communities.Methods International Consultation on Inconvenience Questionnaire Short Form (ICQ-SF) survey was conducted among adult women Shuanglongqiao community and Zongshuying community during April 2012 to April 2013.Results (1) The prevalence rate of urinary incontinence among adult women was 16.84％.The constituent ratio of stress urinary incontinence was 42.6％,mainly with mild occurrence.Women over 41 years old were found with moderate and severe urinary incontinences.(2) The prevalence of urinary incontinence increased with age,especially the middle-aged and elderly women.The incidence was related to educational background,occupation,marriage and pregnancy status,and history of pelvic surgery (P＜ 0.05).Conclusion Urinary incontinence affects middle-aged and elderly women.There are differences of the prevalence of urinary incontinence among adult women with different nationality,occupation,educational background,marriage and pregnancy status,and history of pelvic surgery.
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ObjectiveTo study the physiologic and pathlogic alteration of the artificial bile duct generated by pedicled jejunum flap(CBD)in repairing local defect common bile duct of dog. Methods Common bile duct defected model was generated by partially cutting off CBDofdog.The pedicled jejunum flap with mesentery blood supply was created to repair the local defect CBD.The pH of bile was mcasuratcd during and post operation, the pathologic study was undertaken after 6 months.ResultsThe experimental group live 6 months and the symptom and signs is abnormal after operation.The result of blood routine and biochemistry examination is no change(P＞0.05).The pH of postoperative bile decrease(P＜0.01).The pH of bile was changed remarkably 1 day after the pedicled jejunum flap replacement.But no significant changing in the following 6 months(P＞0.05).The postoperative pathologic study show:the anastomosis of experimental group healing well,and fiber tissue proliferates at the site of anastomosis,The Epithelium of the jejunum flap was atrophy and there were large quantity of lymphocytes,plasma cells and neutrophil within the jejunum flap(10/10).The epithelium of bile duct nearby the jejunum flap appears slight proliferate and infused with lymphocytes and plasma cells(10/10).There were lymphoid follicles in 3/10 cases.ConclusionsThe jejunum flap repairing bile duct healing well,but there was inflamatic change around the jejunum flap and nearby bile duct after the replacement.These observation suggested it is feasible to use the jejunum flap repairing the defected bile duct.The local physiology is stable without any changes in pH of bile acid.The alterative materials like umbilical ligment,blood vessel would be favorable in repair of defected bile duct.
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Objectives To study the significance of using kappa value in surgical clinical teaching.Methods The interns in Department of General Surgery were included,and were divided into routine teaching group and targeted teaching group randomly. Kappa statistic was used to compare the consistency of physical examination.Results The results showed that Morris's point tenderness was grasped more efficiently in targeted teaching than routine teaching group.Conclusion With the help of kappa value teachers can find the teaching items more correlated with training and give students targeted teaching so as to improve the teaching effect.
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Objective To understand and evaluate the early breastfeeding behaviors in preterm infants,and to analyze the evolution process of early breastfeeding behaviors in preterm infants,and therefore to provide a theoretical basis for preterm infant breastfeeding.Methods A continuous evaluation of early breastfeeding behaviors in 38 preterm infants was performed commencing on the beginning of breastfeeding and finishing on the attainment of breastfeeding.Results The earliest breastfeeding was initiated from a postmenstrual age (PMA) of 30 weeks.Obvious rooting,efficient areolar grasp,repeated short sucking bursts and irregular swallowing were noted from 31 weeks; The maximum number of consecutive sucks was limited to between 6 and 24 sucks,with a median of 18 sucks.Full breastfeeding was attained at a median of 36 weeks,between 33 and 38 weeks.Conclusions The early breastfeeding capacity in preterm infants is enhanced and becomes perfect gradually with the implementation of breastfeeding,and that is sufficient and practical for establishment of full breastfeeding at a low postmenstrual age of preterm infants.
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Objective To study the relationship between social support and subjective well-being(SWB) of labor workers.Methods 1038 labor workers in Shenzhen were evaluated by subjective well-being scale for Chinese citizen (SWBS-CC), social support rating scale ( SSRS ).Results There was no significant difference in SWB between male and female( ( 63.51 ± 11.03 ) vs ( 63.22 ± 12.02 ), t = 0.389, P ＞ 0.05 ).The 30 ～ 49 age group's score was significantly higher than the 16 ～29 age group's( (62.80 ± 11.80) vs (64.54 ± 11.28), t=2.21, P ＜ 0.05 ).The married group's score was significantly higher than the unmarried group's ( (62.50 ± 12.18)vs (64.27 ± 10.80 ), t= 2.44, P ＜ 0.05 ).Social support was significant positively correlative with subjective well-being ( r=0.075 ～0.391, P＜0.05), except support availability was not correlative with both subscales.Subjective support, support availability and objective support were significantly positive predictions of SWB, meanwhile subjective support was the biggest( β =0.297).Conclusion Subjective well-being of the labor workers in Shenzhen have significant relationship with age and social support.To increase the emotional support for the labor workers could possibly help to improve their subjective well-being.
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Objective To study the preventive effects of erythropoietin (EPO) on acute tubular necrosis of kidney in rats. Method The rat models of acute renal tubular necrosis were established with injecting glycerol in dose of 10 mL/kg. Thirty Wistar rats were randomly (random number) divided into control group, model group and EPO treatment group. EPO was administered intravenously into rats of treatment group in a dose of 1000IU/kg. Levels of blood urea nitrogen (BUN) and serum creatinine (Scr), urine osmolality, urine N-acetyl-D-glucosaminidase (NAG), urine β2-microglobulin (β2-MG), tissue MDA and SOD of rats in the three groups were assayed after the experiment. Renal histological examination was also performed. Results Compared with model group, the levels of BUN and Scr, urine osmolality, NAG,β2-MG and tissue MDA in EPO treament group were significantly lower, but urine osmolality and tissue SOD of rats remarkably increased in comparison with model group. EPO also lessened the histological changes in treatment group. Conclusions EPO has some protective effects on acute renal tubular necrosis in rats, which is probably through preventing oxygen free radical damage and elevating endogenous antioxidation potential.
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Objective To study a new clinicopathological subtype of primary cutaneous T-cell lym phoma (PCTCL). Methods A case of T-cell lymphoma was systematically evaluated clinically and by using H-E staining, special staining,immunohistochemical staining,gene rearrangement and PCR.Results The skin lesion presented as tender nodules with mucocele. Skin biopsies showed that in the dermis and subcutaneous tissue,most of the angiotropic tumor cells were small T cells; no obvious epidermotropic phenomenon was detected.A few vessels were observed with obvious fibromucinous matrix formation. Immunohislochemical studies showed the following:CD3(+),CD43(+),CD45RO(+),CD56(a few),CD68(-), CD79?(-),CD20 (-), CD30(-), CD117(-), ALK(-), S-100(-),CD45R(-),EMA(-),SMA(-).The mucoid matrix was positive for Alcian blue staining.The rearrangement of T-cell ? receptor gene was detected.EBV was not detected with PCR.Conclusion Fibromucinous T-cell lymphoma rich in blood vessels is a new and distinct variant of PCTCL; it is not a subtype of mycosis fungoides.