首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   4774600篇
  免费   394820篇
  国内免费   15729篇
耳鼻咽喉   69324篇
儿科学   153263篇
妇产科学   128538篇
基础医学   715652篇
口腔科学   134857篇
临床医学   435616篇
内科学   867142篇
皮肤病学   113623篇
神经病学   401478篇
特种医学   192075篇
外国民族医学   1328篇
外科学   728586篇
综合类   139616篇
现状与发展   23篇
一般理论   2755篇
预防医学   401284篇
眼科学   114624篇
药学   342685篇
  20篇
中国医学   12184篇
肿瘤学   230476篇
  2021年   50642篇
  2019年   59126篇
  2018年   75050篇
  2017年   57019篇
  2016年   63525篇
  2015年   76260篇
  2014年   111164篇
  2013年   176686篇
  2012年   133878篇
  2011年   140215篇
  2010年   128220篇
  2009年   129563篇
  2008年   127074篇
  2007年   136283篇
  2006年   144317篇
  2005年   139282篇
  2004年   139935篇
  2003年   130154篇
  2002年   120073篇
  2001年   183111篇
  2000年   180448篇
  1999年   162402篇
  1998年   69429篇
  1997年   64522篇
  1996年   62328篇
  1995年   63439篇
  1994年   57655篇
  1993年   53401篇
  1992年   123126篇
  1991年   119211篇
  1990年   113887篇
  1989年   110631篇
  1988年   102567篇
  1987年   100972篇
  1986年   95473篇
  1985年   93230篇
  1984年   76498篇
  1983年   67406篇
  1982年   51215篇
  1981年   47511篇
  1980年   44535篇
  1979年   68105篇
  1978年   53379篇
  1977年   46647篇
  1976年   43654篇
  1975年   43988篇
  1974年   50078篇
  1973年   48113篇
  1972年   45131篇
  1971年   41355篇
排序方式: 共有10000条查询结果,搜索用时 34 毫秒
81.
Journal of Public Health - Group prenatal care provides an alternative model of prenatal care that allows for collaboration with peers, education, discussion, and self-management training in...  相似文献   
82.
Peng  L. Q.  Wu  X. X.  Chen  G.  Cai  H. Z.  Tang  Y. P.  Chen  Q. Y.  Chen  X. Y. 《Bulletin of experimental biology and medicine》2022,173(3):335-340
Bulletin of Experimental Biology and Medicine - This study aimed to explore the effects of Wenyang Zhenshuai granules (WZG) on the morphology of cardiomyocytes, cell viability, and the expression...  相似文献   
83.
84.
  • DNA is the sequence that codes for proteins.
  • Messenger RNA is transcribed from the DNA sequence of genes and translated into protein.
  • It can be difficult to predict how a change in the DNA sequence will affect messenger RNA and protein quantity and quality.
  • DNA translocation changes can cause the joining of sequences from two different genes or different parts of the same gene.
  • DNA sequencing is often used clinically to predict how DNA changes might affect proteins.
  • Alternatively, RNA sequencing can be used as a more direct measure of the effect of DNA changes on the protein products.
  • This sequencing is important for identifying changes in cancer that may indicate response to targeted therapy, prognosis, or diagnosis.
  相似文献   
85.
Genome-scale screening experiments in cancer produce long lists of candidate genes that require extensive interpretation for biological insight and prioritization for follow-up studies. Interrogation of gene lists frequently represents a significant and time-consuming undertaking, in which experimental biologists typically combine results from a variety of bioinformatics resources in an attempt to portray and understand cancer relevance. As a means to simplify and strengthen the support for this endeavor, we have developed oncoEnrichR, a flexible bioinformatics tool that allows cancer researchers to comprehensively interrogate a given gene list along multiple facets of cancer relevance. oncoEnrichR differs from general gene set analysis frameworks through the integration of an extensive set of prior knowledge specifically relevant for cancer, including ranked gene-tumor type associations, literature-supported proto-oncogene and tumor suppressor gene annotations, target druggability data, regulatory interactions, synthetic lethality predictions, as well as prognostic associations, gene aberrations and co-expression patterns across tumor types. The software produces a structured and user-friendly analysis report as its main output, where versions of all underlying data resources are explicitly logged, the latter being a critical component for reproducible science. We demonstrate the usefulness of oncoEnrichR through interrogation of two candidate lists from proteomic and CRISPR screens. oncoEnrichR is freely available as a web-based service hosted by the Galaxy platform ( https://oncotools.elixir.no ), and can also be accessed as a stand-alone R package ( https://github.com/sigven/oncoEnrichR ).  相似文献   
86.
87.
88.

Objective

To examine the experience of interracial anxiety among health professionals and how it may affect the quality of their interactions with patients from racially marginalized populations. We explored the influence of prior interracial exposure—specifically through childhood neighborhoods, college student bodies, and friend groups—on interracial anxiety among medical students and residents. We also examined whether levels of interracial anxiety change from medical school through residency.

Data Source

Web-based longitudinal survey data from the Medical Student Cognitive Habits and Growth Evaluation Study.

Study Design

We used a retrospective longitudinal design with four observations for each trainee. The study population consisted of non-Black US medical trainees surveyed in their 1st and 4th years of medical school and 2nd and 3rd years of residency. Mixed effects longitudinal models were used to assess predictors of interracial anxiety and assess changes in interracial anxiety scores over time.

Principal Findings

In total, 3155 non-Black medical trainees were followed for 7 years. Seventy-eight percent grew up in predominantly White neighborhoods. Living in predominantly White neighborhoods and having less racially diverse friends were associated with higher levels of interracial anxiety among medical trainees. Trainees' interracial anxiety scores did not substantially change over time; interracial anxiety was highest in the 1st year of medical school, lowest in the 4th year, and increased slightly during residency.

Conclusions

Neighborhood and friend group composition had independent effects on interracial anxiety, indicating that premedical racial socialization may affect medical trainees' preparedness to interact effectively with diverse patient populations. Additionally, the lack of substantial change in interracial anxiety throughout medical training suggests the importance of providing curricular tools and structure (e.g., instituting interracial cooperative learning activities) to foster the development of healthy interracial relationships.  相似文献   
89.
90.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号