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viral capsid antigen vca
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     Purification and application of viral capsid antigen of Epstein Barr virus
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     STUDY OF SERUM IgA ANTIBODY TO EB VIRAL CAPSID ANTIGEN IN NASOPHARYNGEAL CARCINOMA FROM SHAANXI
     陕西籍鼻咽癌患者血清EB病毒VCA—IgA抗体水平的研究
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  viral capsid antigen vca
IgG and IgA antibodies to viral capsid antigen (VCA), IgG antibodies to early antigen (EA), and antibodies to EBV nuclear antigen were detected at higher titers in sera of patients with uveitis than in the sera of healthy controls.
      
In the three groups of patients significantly higher titers of antibodies to EB viral capsid antigen (VCA) were found as compared to the controls.
      
The inhibitor reduced viral capsid antigen (VCA) positive cells.
      
Sera from patients with other types of head and neck cancer and relatively high levels of IgG antibody against viral capsid antigen (VCA) and EA did not react reproducibly with any of the EBV-associated proteins.
      
Nasopharyngeal carcinoma (NPC) patients have elevated IgG and IgA antibody titers against the Epstein-Barr viral capsid antigen (VCA) and the diffuse component of the early antigen complex (EA-D) at diagnosis.
      
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A total of 154 sera from patients with nasopharyngeal carcinoma(NPC), patients with other head and neck tumors(OHNT) and healthy individuals (HI) from Shaanxi province were tested for IgA antibody to EB viral capsid antigen (VCA-IgA) by immunoenzyrnie method. 75.93% of 54 pretreated NPC patients had VCA-IgA antibody with a GMT of 1: 38. 00,whereas less than 12. 00%of 50 OHNT and 50 HI with a GMT of 1: 2. 5 ~ 1: 3. 35.The results showed that the detection of VCA-IgA was of...

A total of 154 sera from patients with nasopharyngeal carcinoma(NPC), patients with other head and neck tumors(OHNT) and healthy individuals (HI) from Shaanxi province were tested for IgA antibody to EB viral capsid antigen (VCA-IgA) by immunoenzyrnie method. 75.93% of 54 pretreated NPC patients had VCA-IgA antibody with a GMT of 1: 38. 00,whereas less than 12. 00%of 50 OHNT and 50 HI with a GMT of 1: 2. 5 ~ 1: 3. 35.The results showed that the detection of VCA-IgA was of great value in diagnosis of NPC from low risk areas. The elevated level of VCA-IgA was seen in well-differentiated squamous cell carcinoma which gave a pattern similar to that noted in vacuolar nuclear cell carcinoma or less-differentiated carcinoma, but not in undifferentiated carcinoma. The VCA-IgA positive ratio in NPC patients below 30-year-old was similar to that in OHNT, however the GMT was elevated markedly. The results above showed that VCA-IgA antibody was of little value in diagnosis of NPC below 30-year-old and undifferentiated carcinoma.

用免疫酶法检测了陕西籍的鼻咽癌、头颈部其它肿瘤和健康人血清EB病毒VCA—IgA抗体。54例治疗前鼻咽癌其抗体阳性率为75.93%,几何平均滴度为38.00,而50例头颈部其它肿瘤和50例健康人的抗体阳性率低于12.00%,几何平均滴度为2.50~3.25。表明VCA—IgA测定对低发区鼻咽癌的临床诊断具有十分重要的参考价值。鼻咽高分化鳞癌同低分化鳞癌、泡状核细胞癌一样,血清VCA—IgA抗体的阳性率和几何平均滴度显著增高,而鼻咽未分化癌与头颈部其它肿瘤相似,显著低于上述3种病理类型。30岁以下鼻咽癌血清VCA—IgA抗体的阳性率与头颈部其它肿瘤相似,但几何平均滴度显著增高。以上结果表明,VCA—IgA检测对低发区鼻咽未分化癌和30岁以下鼻咽癌的诊断价值不大。

Abstract Objectives Systemic lupus erythematosus (SLE) is a multifactorial disease. Environmental factors such as viral infection(s) have been proposed as pathaetiological factors. There are particular interests in studying lymphotropic viruses such as the Epstein Barr virus (EBV) and cytomegalovirus (CMV). Although previous case reports and in vitro studies suggested that they may have a role, there is no direct evidence that onset of SLE or disease exacerbation is associated with active infection...

Abstract Objectives Systemic lupus erythematosus (SLE) is a multifactorial disease. Environmental factors such as viral infection(s) have been proposed as pathaetiological factors. There are particular interests in studying lymphotropic viruses such as the Epstein Barr virus (EBV) and cytomegalovirus (CMV). Although previous case reports and in vitro studies suggested that they may have a role, there is no direct evidence that onset of SLE or disease exacerbation is associated with active infection by these viruses. Using the very sensitive polymerase chain reaction (PCR) technique, we tried to find out evidence of active replication of these viruses in patients with SLE. Methods Thirty four patients with SLE were compared with matched normal controls. Eleven patients were newly diagnosed to have SLE and 18 of the 34 patients had active disease as determined by a SLE Disease Activity Index (SLEDAI) score of ≥10 at the time of study. Results Our results showed no evidence of active replication or reactivation of EBV in the leucocytes amongst the newly diagnosed SLE patients, established SLE patients, patients with SLEDAI ≥10, patients with SLEDAI <10, and control subjects. There was no evidence of CMV infection in any of the subjects studied. The IgG and IgA responses against EBV early antigen (EA) and viral capsid antigen (VCA) were also studied. The IgG and IgA responses against VCA of EBV were increased in patients with SLE when compared with controls. However, there were no differences in these responses among different subgroups of patients. The mechanism of these responses was not apparent but may represent non specific hyperimmune responses in these patients. There were no differences in the titre of IgG and IgA against EBV EA between the patient groups and controls. Conclusion There is no direct evidence that either EBV or CMV plays a direct role in the onset and/or exacerbation of SLE.

LackofevidenceofactivelyticreplicationofEpsteinBarrandcytomegalovirusesinpatientswithsystemiclupuserythematosusLauChakSing,...

Aim:To obtain sufficient Epstein-Barr viral capsid antigen and apply it to the diagnosis of Nasopharyngeal Carcinoma based on ELISA.Methods:Using the recombinant DNA technique,a fragment of gene BALF_4 was cloned into vector plasmid pUR291 and a fusion protein consisting of β-galactosidase and the major polypeptide of Epstein-Barr viral capsid antigen (VCA)was expressed in E.coli.After determining the specificity of the fusion protein,the product was purified by DEAESepharose...

Aim:To obtain sufficient Epstein-Barr viral capsid antigen and apply it to the diagnosis of Nasopharyngeal Carcinoma based on ELISA.Methods:Using the recombinant DNA technique,a fragment of gene BALF_4 was cloned into vector plasmid pUR291 and a fusion protein consisting of β-galactosidase and the major polypeptide of Epstein-Barr viral capsid antigen (VCA)was expressed in E.coli.After determining the specificity of the fusion protein,the product was purified by DEAESepharose Fast Flow ion-exhange column chromatography.ELISAswere established with the purified product,using rabbit antiserum to block β-galactosidase in human sera.Results:There was a close correlation between results of the immunofluorescence and ELISA(r=0.6236,P<0.001;R=0.9225,p<0.001).The IgG and IgA positive sera determined by immunofluoresence were also positive when determined by ELISAs,and GMT were respectively 13 times and 15 times as immunofluorescence.Three positive sera were detected by ELISA in 40 IgA negative sera determined by immunofluorescence,suggesting that ELISA is more sensitiv than immunofluorescence assay.Conclusion:The Epstein-Barr viral capsid antigen expressed in prokaryotic is useful in the application of the diagnosis of Nasopharyngeal Carcinoma based on ELISA.

获得足够的EB病毒壳抗原,建立ELISA方法用于鼻咽癌的诊断。方法:将 BALF4基因克隆进入 载体pUR291,在大肠杆菌中表达EB病毒壳抗原与β-半乳糖苷酶的融合蛋白,并通过DEAE-Sepharose Fast Flow离子 交换柱层析对融合蛋白进行纯化,将纯化的蛋白用于 ELISA方法检测人血清中的IgG/VCA和 IgA/VCA抗体,用带 有pUR291质粒的宿主菌裂解液吸收待检血清中的抗β-半乳糖苷酶抗体。结果:ELISA方法与免疫荧光方法检测的 结果呈正相关(r=0.6236,P<0.001;r=0.9225,P<0.001)。免疫荧光方法检测为阳性的血清,ELISA检测均为 阳性;IgG/VCA和IgA/VCA抗体的几何平均滴度(GMT)分别是免疫荧光方法的13倍和15倍。在40份免疫荧光检 测IgA/VCA阴性的血清中,ELISA检测有3例阳性,表明ELISA方法比免疫荧光方法更敏感。结论:在原核系统中 表达抗原,为ELISA方法在鼻咽癌的诊断和大规模血清学普查中的应用提供了一个有效手段。

 
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