cancer,tumor biology主页,neoplasm,sarsinoma的区别

Cancer hospital还是tumor hospital_百度文库
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Cancer hospital还是tumor hospital
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你可能喜欢数据库中的关键词检索和主题检索的区别是什么?_百度知道
数据库中的关键词检索和主题检索的区别是什么?
  主题词与关键词的区别  主题词与关键词最大的区别就是主题词经过了规范化处理。  主题词是规范化的检索语言,它对文献中出现的同义词、近义词、多义词以及同一概念的不同书写形式等进行严格的控制和规范,使每个主题词都含义明确,以便准确检索,防止误检、漏检。如:白介素2、白细胞介素2、IL2、IL-2等表达同一概念的不同书写形式规范为“白细胞介素2”。  主题词表是对主题词进行规范化处理的依据,也是文献处理者和检索者共同参照的依据。  而关键词是属于自然语言的范畴,未经规范化处理,也不受主题词表的控制。如:对于“白细胞介素2”这一概念可有白介素2、白细胞介素2、IL2、IL-2等不同形式来表达。  因此,为了达到较高的查准率和查全率,如果检索工具提供了主题词这一检索途径的话就应该选择主题词来进行检索,而不应该选择关键词。  例如:利用MEDLINE光盘数据库检索有关“肝肿瘤”方面的文献。  MEDLINE光盘数据库既提供了主题词途径,也提供了自由词(关键词)途径。如果选择关键词途径来进行检索,欲达到较高的查准率和查全率,就得查找“liver cancer”、“liver carcinoma”、“liver neoplasm”、“liver tumor”、“hepatic cancer”、“hepatic carcinoma”、“hepatic neoplasm”、“hepatic tumor”等词,另外还得考虑像cancer、carcinoma、neoplasm、tumor等词还有复数形式;而如果选择主题词途径进行检索就只需查找“liver neoplasms”一词就行了,这一词就包括了以上所提及的不同的表达形式。由此可见,选用主题词途径检索,既能满足较高的查准率、查全率,又能提高检索速度,何乐而不为呢?
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我们在文献检索时,通常都是使用关键词进行检索。这种关键词是未经规范化的自然语言语词,这种关键词由于受限制比较小,
其他2条回答
关键词检索用的模糊查询就是like语句,结果范围大,但是不精确,效率低主题检索是准确查询,结果范围小,精确度高,效率高
主题词与关键词最大的区别就是主题词经过了规范化处理。 主题词是规范化的检索语言,它对文献中出现的同义词、近义词、多义词以及同一概念的不同书写形式等进行严格的控制和规范,使每个主题词都含义明确,以便准确检索,防止误检、漏检。如:白介素2、白细胞介素2、IL2、IL-2等表达同一概念的不同书写形式规范为“白细胞介素2”。 主题词表是对主题词进行规范化处理的依据,也是文献处理者和检索者共同参照的依据。 而关键词是属于自然语言的范畴,未经规范化处理,也不受主题词表的控制。如:对于“白细胞介素2”这一概念可有白介素2、白细胞介素2、IL2、IL-2等不同形式来表达。 因此,为了达到较高的查准率和查全率,如果检索工具提供了主题词这一检索途径的话就应该选择主题词来进行检索,而不应该选择关键...
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出门在外也不愁瘤 neoplasm_图文_百度文库
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你可能喜欢Anti-tumor antibodies in ovarian cancer.
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):55-62.Anti-tumor antibodies in ovarian cancer.1, , , , , .1Department of Pharmacology, Rush Univerity Medical Center, Chicago, IL 60612, USA. jluborsk@rush.eduAbstractAnti-tumor antibodies have potential as cancer biomarkers. There is relatively limited identification of anti-tumor antibodies in response to ovarian cancer, compared with studies for other cancers. There is also very limited information on the prevalence of anti-tumor antibodies among ovarian cancer patients. Although most anti-tumor antibodies react with antigens common to both tumor and normal tissue, the anti-tumor response tends to be confined to individuals with ovarian cancer, similar to other cancers. Antibodies to HOXA7, a differentiation antigen, have the highest reported prevalence in ovarian cancer (67%). Antibodies to other ubiquitous antigens including NY-ESO-1, Ep-CAM (epithelial cell adhesion molecule), HSP-90 (heat shock protein 90), and mutated p53 have been identified in ovarian cancer. Anti-tumor antibody specificity reflects the heterogeneity of antigen expression in tumors. Tests based on panels of a combination of anti-tumor antibodies may be more predictive for ovarian cancer, as no single specificity accounts for ovarian tumors. In addition to characterization of anti-tumor antibodies as diagnostic markers, study of anti-tumor antibodies is likely to provide insights into mechanisms of tumor development. There is evidence of antibodies to tumor antigens and of activated T cells, suggesting immune recognition of tumor antigens occurred. Nonetheless, as tumors are not 'rejected', it is likely that there are alterations in the immune system. The basis for tumor growth in the face of immune activity remains to be determined.PMID:
[PubMed - indexed for MEDLINE]
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