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   170313篇
  免费   8134篇
  国内免费   560篇
耳鼻咽喉   2747篇
儿科学   5118篇
妇产科学   3906篇
基础医学   23113篇
口腔科学   5879篇
临床医学   11652篇
内科学   41207篇
皮肤病学   5384篇
神经病学   14254篇
特种医学   3873篇
外国民族医学   2篇
外科学   19987篇
综合类   1081篇
一般理论   51篇
预防医学   16586篇
眼科学   3596篇
药学   12014篇
中国医学   940篇
肿瘤学   7617篇
  2023年   1067篇
  2022年   928篇
  2021年   4613篇
  2020年   2362篇
  2019年   4355篇
  2018年   6209篇
  2017年   3692篇
  2016年   3615篇
  2015年   4065篇
  2014年   5442篇
  2013年   7755篇
  2012年   12146篇
  2011年   12986篇
  2010年   6844篇
  2009年   5463篇
  2008年   10122篇
  2007年   10624篇
  2006年   9900篇
  2005年   9883篇
  2004年   8801篇
  2003年   8194篇
  2002年   7575篇
  2001年   4511篇
  2000年   5074篇
  1999年   4050篇
  1998年   995篇
  1997年   775篇
  1996年   670篇
  1995年   576篇
  1994年   458篇
  1993年   398篇
  1992年   1577篇
  1991年   1298篇
  1990年   1173篇
  1989年   978篇
  1988年   851篇
  1987年   777篇
  1986年   786篇
  1985年   686篇
  1984年   496篇
  1983年   424篇
  1979年   460篇
  1975年   312篇
  1974年   400篇
  1973年   401篇
  1972年   340篇
  1971年   366篇
  1970年   327篇
  1969年   353篇
  1968年   314篇
排序方式: 共有10000条查询结果,搜索用时 273 毫秒
21.
22.
Obesity Surgery - Laparoscopic sleeve gastrectomy (LSG) is increasingly playing a key role in obesity management. Such operations, however, carry complications sometimes including leaks. The...  相似文献   
23.
24.
25.
26.
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   
27.
28.
Obesity is a risk factor for colorectal cancer. Yet, some research indicates that weight-reducing bariatric surgery also increases colorectal cancer risk. Our study was undertaken because current evidence examining bariatric surgery and risk of colorectal cancer is limited and inconsistent. This population-based cohort study included adults with a documented obesity diagnosis in Denmark, Finland, Iceland, Norway or Sweden in 1980–2015. The incidence of colorectal cancer in participants with obesity who had and had not undergone bariatric surgery was compared to the incidence in the corresponding background population by calculating standardized incidence ratios (SIR) with 95% confidence intervals (CI). Additionally, operated and nonoperated participants with obesity were compared using multivariable Cox regression, providing hazard ratios (HR) with 95% CIs adjusted for confounders. Among 502,772 cohort participants with an obesity diagnosis, 49,931(9.9%) underwent bariatric surgery. The overall SIR of colon cancer was increased after bariatric surgery (SIR 1.56; 95% CI 1.28–1.88), with higher SIRs ≥10 years postsurgery. The overall HR of colon cancer in operated compared to nonoperated participants was 1.13 (95% CI 0.92–1.39) and 1.55 (95% CI 1.04–2.31) 10–14 years after bariatric surgery. Bariatric surgery did not significantly increase the risk of rectal cancer (SIR 1.14, 95% CI 0.83–1.52; HR 1.08, 95% CI 0.79–1.49), but the risk estimates increased with longer follow-up periods. Our study suggests that bariatric surgery is associated with an increased risk of colon cancer, while the support for an increased risk of rectal cancer was weaker.  相似文献   
29.
Hailey–Hailey disease (HHD), also known as benign familial pemphigus, is an autosomal dominant skin condition that affects the adhesion of epidermal keratinocytes. Although the initial manifestation of flaccid vesicles on erythematous or normal skin in flexure sites frequently goes unnoticed, large, macerated, exudative plaques of superficial erosions with crusting are observed at the time of diagnosis. There is no specific treatment for HHD, and most cases are symptomatically supported. However, infrared laser ablation has been somewhat helpful. We present a case successfully treated with fractional CO2 laser showing a long-term favourable outcome and no adverse effects. Thus, this modality could be an alternative to full ablation for this condition.  相似文献   
30.
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