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   60532篇
  免费   3122篇
  国内免费   296篇
耳鼻咽喉   757篇
儿科学   1574篇
妇产科学   1196篇
基础医学   7559篇
口腔科学   2749篇
临床医学   4359篇
内科学   15602篇
皮肤病学   1225篇
神经病学   5169篇
特种医学   1794篇
外科学   9341篇
综合类   313篇
一般理论   23篇
预防医学   3914篇
眼科学   958篇
药学   3392篇
中国医学   190篇
肿瘤学   3835篇
  2024年   39篇
  2023年   410篇
  2022年   843篇
  2021年   2130篇
  2020年   1139篇
  2019年   1701篇
  2018年   2066篇
  2017年   1356篇
  2016年   1523篇
  2015年   1741篇
  2014年   2511篇
  2013年   3033篇
  2012年   4956篇
  2011年   5010篇
  2010年   2924篇
  2009年   2471篇
  2008年   4124篇
  2007年   4109篇
  2006年   3980篇
  2005年   3822篇
  2004年   3275篇
  2003年   2971篇
  2002年   2747篇
  2001年   346篇
  2000年   248篇
  1999年   371篇
  1998年   466篇
  1997年   375篇
  1996年   344篇
  1995年   334篇
  1994年   260篇
  1993年   219篇
  1992年   181篇
  1991年   145篇
  1990年   139篇
  1989年   98篇
  1988年   104篇
  1987年   79篇
  1986年   107篇
  1985年   93篇
  1984年   109篇
  1983年   100篇
  1982年   98篇
  1981年   90篇
  1980年   105篇
  1979年   62篇
  1978年   74篇
  1977年   69篇
  1976年   44篇
  1973年   41篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
1.
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   
2.
3.
Breast pseudoaneurysms after a core needle biopsy are a rare complication with a low incidence. However, it is important to be aware of the possibility of complications that require treatment.  相似文献   
4.
5.
Lasers in Medical Science - Studies reported the harmful effects of 2,4-D on body tissues, provoking changes in the anatomy and physiology of the kidneys, liver, and testicles. Thus, the objective...  相似文献   
6.
7.
The present study aimed at measuring seropositivities for infection by Ascaris suum and Toxocara canis using the excretory/secretory (E/S) antigens from Ascaris suum (AES) and Toxocara canis (TES) within an indigenous population. In addition, quantification of cytokine expressions in peripheral blood cells was determined. A total of 50 Warao indigenous were included; of which 43 were adults and seven children. In adults, 44.1% were seropositive for both parasites; whereas children had only seropositivity to one or the other helminth. For ascariosis, the percentage of AES seropositivity in adults and children was high; 23.3% and 57.1%, respectively. While that for toxocariosis, the percentage of TES seropositivity in adults and children was low; 9.3% and 14.3%, respectively. The percentage of seronegativity was comparable for AES and TES antigens in adults (27.9%) and children (28.6%). When positive sera were analyzed by Western blotting technique using AES antigens; three bands of 97.2, 193.6 and 200.2 kDas were mostly recognized. When the TES antigens were used, nine major bands were mostly identified; 47.4, 52.2, 84.9, 98.2, 119.1, 131.3, 175.6, 184.4 and 193.6 kDas. Stool examinations showed that Blastocystis hominis, Hymenolepis nana and Entamoeba coli were the most commonly observed intestinal parasites. Quantification of cytokines IFN-γ, IL-2, IL-6, TGF-β, TNF-α, IL-10 and IL-4 expressions showed that there was only a significant increased expression of IL-4 in indigenous with TES seropositivity (p < 0.002). Ascaris and Toxocara seropositivity was prevalent among Warao indigenous.  相似文献   
8.
Chlorpyrifos is the most used insecticide in Argentina. Cnesterodon decemmaculatus is a widely distributed, endemic fish from Neotropical America. It attains high densities in the shallow water assemblages of Argentina and Brazil. The aim of this study was to assess the acute toxicity of chlorpyrifos to C. decemmaculatus. The mean 96-h LC50 of three independent determinations was 105.3 (±?3.1) μg/L. Sublethal effects were observed. Swimming behavioral changes at each chlorpyrifos exposure concentration were reported. C. decemmaculatus represents a good model for ecotoxicological risk assessment.  相似文献   
9.
ABSTRACT

Introduction

Glucocorticoid (GC) induced osteoporosis (GIOP) is the most common form of secondary osteoporosis. It develops in a dose and time dependent manner, due to a rapid and transient increase in bone resorption, followed by the inhibition of bone formation.  相似文献   
10.
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