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   69531篇
  免费   3708篇
  国内免费   349篇
耳鼻咽喉   919篇
儿科学   1742篇
妇产科学   1345篇
基础医学   8816篇
口腔科学   3791篇
临床医学   5018篇
内科学   17403篇
皮肤病学   1425篇
神经病学   5718篇
特种医学   1927篇
外科学   10424篇
综合类   352篇
一般理论   23篇
预防医学   5150篇
眼科学   1076篇
药学   4043篇
中国医学   289篇
肿瘤学   4127篇
  2024年   63篇
  2023年   544篇
  2022年   1211篇
  2021年   2506篇
  2020年   1376篇
  2019年   2006篇
  2018年   2468篇
  2017年   1613篇
  2016年   1837篇
  2015年   2082篇
  2014年   2955篇
  2013年   3490篇
  2012年   5703篇
  2011年   5879篇
  2010年   3403篇
  2009年   2803篇
  2008年   4698篇
  2007年   4593篇
  2006年   4366篇
  2005年   4184篇
  2004年   3569篇
  2003年   3221篇
  2002年   2974篇
  2001年   506篇
  2000年   389篇
  1999年   469篇
  1998年   500篇
  1997年   393篇
  1996年   354篇
  1995年   350篇
  1994年   282篇
  1993年   228篇
  1992年   231篇
  1991年   185篇
  1990年   166篇
  1989年   132篇
  1988年   136篇
  1987年   114篇
  1986年   128篇
  1985年   117篇
  1984年   131篇
  1983年   122篇
  1982年   120篇
  1981年   99篇
  1980年   115篇
  1979年   78篇
  1978年   83篇
  1977年   73篇
  1976年   47篇
  1973年   53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.
9.
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   
10.
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   
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