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   128333篇
  免费   9133篇
  国内免费   523篇
耳鼻咽喉   1399篇
儿科学   3079篇
妇产科学   2269篇
基础医学   17817篇
口腔科学   3218篇
临床医学   12343篇
内科学   28740篇
皮肤病学   2485篇
神经病学   12882篇
特种医学   4685篇
外国民族医学   6篇
外科学   18890篇
综合类   1423篇
一般理论   76篇
预防医学   9821篇
眼科学   2154篇
药学   8343篇
中国医学   232篇
肿瘤学   8127篇
  2023年   773篇
  2022年   1512篇
  2021年   3076篇
  2020年   1745篇
  2019年   2848篇
  2018年   3423篇
  2017年   2347篇
  2016年   2708篇
  2015年   3210篇
  2014年   4340篇
  2013年   5647篇
  2012年   8784篇
  2011年   8898篇
  2010年   5254篇
  2009年   4739篇
  2008年   7681篇
  2007年   8253篇
  2006年   7640篇
  2005年   7390篇
  2004年   6903篇
  2003年   6245篇
  2002年   6082篇
  2001年   2022篇
  2000年   1904篇
  1999年   1822篇
  1998年   1402篇
  1997年   1141篇
  1996年   950篇
  1995年   935篇
  1994年   793篇
  1993年   715篇
  1992年   1222篇
  1991年   1117篇
  1990年   1060篇
  1989年   1006篇
  1988年   904篇
  1987年   842篇
  1986年   851篇
  1985年   863篇
  1984年   703篇
  1983年   618篇
  1982年   599篇
  1981年   498篇
  1980年   438篇
  1979年   532篇
  1978年   429篇
  1977年   392篇
  1975年   349篇
  1974年   376篇
  1973年   361篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
1.
2.
3.
International Journal of Clinical Oncology - Immune-checkpoint inhibitors (ICIs) are standard treatments for metastatic non-small cell lung cancer (NSCLC). Patients with poor performance status...  相似文献   
4.
5.
We review the spectrum of cutaneous disorders associated with inflammatory and neoplastic plasmacytic pathology. Because plasma cells are derived from B‐lymphocytes our overview includes discussion of certain lymphoplasmacytic proliferations. It is structured along histopathological lines, addressing conditions characterized by (a) cutaneous plasma cell infiltrates, (b) deposits of plasma cell products or their derivatives in the skin and (c) miscellaneous, poorly understood cutaneous complications of plasmacytic disorders. Lesions arising primarily in the skin and those due to cutaneous involvement by multisystem disorders are addressed. The range includes a spectrum of tumefactive and circulatory manifestations. We highlight key clinical and pathological features of the different conditions and outline recent advances in our understanding of these entities. By emphasizing the dermatopathological characteristics of this spectrum of disorders we hope to hone the diagnostic accuracy of practitioners in the field.  相似文献   
6.
The current study explored the influence of three methods of parental emotion discourse (structured story-telling, reminiscing, and picture book) and their relation to preschoolers’ emotion understanding. Thirty-seven families participated in the study. Analyses showed that the structured story-telling method produced more emotion words, was high in unique emotion words, and was high for both emotion labelling and explanations. All three methods showed some potential to predict preschooler’s emotion understanding. Structured story-telling was best at predicting role-taking, while reminiscing and the picture book both were better at predicting situation knowledge. Additional studies are needed to further explore the influence of different methods of assessing emotion discourse to enhance validity and reliability of research in this field.  相似文献   
7.
8.
9.
10.
Nidogen 1 (NID1) is a glycoprotein found in basement membranes involved in cross-linking collagen IV and laminin. The role of NID in breast cancer has only been evaluated in a small number of studies and the findings of these studies have been inconsistent. Our previous work revealed that highly tumorigenic murine mammary tumor cells express high levels of Nid1 while weakly tumorigenic mammary tumor cells express low levels of Nid1. To investigate Nid1, two stable knockdown lines were created, and Nid1 knockdown was confirmed at both the mRNA and protein level. Nid1 knockdown significantly reduced cell proliferation and migration/invasion and these reductions in proliferation and migration/invasion could be rescued by conditioned media containing NID1 protein. The reduced migration/invasion observed in the Nid1 knockdown cells was not associated with significant alterations in the epithelial gene Cdh1 or the mesenchymal genes Snai1, Snai2, Twist1, Twist2, Zeb1 and Zeb2. Therefore, suppression of Nid1 expression reduces proliferation and migration/invasion in claudin-low murine mammary tumor cells.  相似文献   
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