全文获取类型
收费全文 | 25804篇 |
免费 | 1520篇 |
国内免费 | 407篇 |
专业分类
耳鼻咽喉 | 994篇 |
儿科学 | 683篇 |
妇产科学 | 1248篇 |
基础医学 | 3351篇 |
口腔科学 | 226篇 |
临床医学 | 2050篇 |
内科学 | 4704篇 |
皮肤病学 | 624篇 |
神经病学 | 2305篇 |
特种医学 | 751篇 |
外国民族医学 | 7篇 |
外科学 | 1940篇 |
综合类 | 857篇 |
现状与发展 | 1篇 |
一般理论 | 5篇 |
预防医学 | 1770篇 |
眼科学 | 816篇 |
药学 | 3673篇 |
5篇 | |
中国医学 | 514篇 |
肿瘤学 | 1207篇 |
出版年
2024年 | 32篇 |
2023年 | 207篇 |
2022年 | 430篇 |
2021年 | 593篇 |
2020年 | 439篇 |
2019年 | 608篇 |
2018年 | 918篇 |
2017年 | 695篇 |
2016年 | 817篇 |
2015年 | 896篇 |
2014年 | 1250篇 |
2013年 | 1495篇 |
2012年 | 1951篇 |
2011年 | 2160篇 |
2010年 | 1180篇 |
2009年 | 718篇 |
2008年 | 1362篇 |
2007年 | 1657篇 |
2006年 | 1605篇 |
2005年 | 1561篇 |
2004年 | 1537篇 |
2003年 | 1513篇 |
2002年 | 1226篇 |
2001年 | 577篇 |
2000年 | 622篇 |
1999年 | 435篇 |
1998年 | 179篇 |
1997年 | 110篇 |
1996年 | 69篇 |
1995年 | 79篇 |
1994年 | 49篇 |
1993年 | 42篇 |
1992年 | 64篇 |
1991年 | 48篇 |
1990年 | 56篇 |
1989年 | 31篇 |
1988年 | 33篇 |
1987年 | 39篇 |
1986年 | 26篇 |
1985年 | 34篇 |
1984年 | 20篇 |
1983年 | 27篇 |
1982年 | 28篇 |
1981年 | 35篇 |
1980年 | 22篇 |
1979年 | 27篇 |
1978年 | 24篇 |
1977年 | 19篇 |
1976年 | 15篇 |
1975年 | 20篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Xiao-Long Tang Yan-Dong Miao Deng-Hai Mi 《World journal of gastrointestinal oncology》2022,14(1):366-368
The present letter to the editor is in response to the research “Outcomes of curative liver resection for hepatocellular carcinoma in patients with cirrhosis” by Elshaarawy et al in World J Gastroenterol 2021; 13(5): 424–439. The preoperative assessment of the liver reserve function in hepatocellular carcinoma (HCC) patients with cirrhosis is crucial, and there is no universal consensus on how to assess it. Based on a retrospective study, Elshaarawy et al investigated the impact of various classical clinical indicators on liver failure and the prognosis after hepatectomy in HCC patients with cirrhosis. We recommend that we should strive to explore new appraisal indicators, such as the indocyanine green retention rate at 15 min. 相似文献
2.
3.
4.
Inflammation but not obesity or insulin resistance is associated with increased plasma fibroblast growth factor 23 concentration in the elderly
下载免费PDF全文
![点击此处可从《Clinical endocrinology》网站下载免费的PDF全文](/ch/ext_images/free.gif)
5.
6.
Konrad Matyja Anna Małachowska-Jutsz Anna K. Mazur Kazimierz Grabas 《Ecotoxicology (London, England)》2016,25(5):924-939
Dehydrogenase activity is frequently used to assess the general condition of microorganisms in soil and activated sludge. Many studies have investigated the inhibition of dehydrogenase activity by various compounds, including heavy metal ions. However, the time after which the measurements are carried out is often chosen arbitrarily. Thus, it can be difficult to estimate how the toxic effects of compounds vary during the reaction and when the maximum of the effect would be reached. Hence, the aim of this study was to create simple and useful mathematical model describing changes in dehydrogenase activity during exposure to substances that inactivate enzymes. Our model is based on the Lagergrens pseudo-first-order equation, the rate of chemical reactions, enzyme activity, and inactivation and was created to describe short-term changes in dehydrogenase activity. The main assumption of our model is that toxic substances cause irreversible inactivation of enzyme units. The model is able to predict the maximum direct toxic effect (MDTE) and the time to reach this maximum (TMDTE). In order to validate our model, we present two examples: inactivation of dehydrogenase in microorganisms in soil and activated sludge. The model was applied successfully for cadmium and copper ions. Our results indicate that the predicted MDTE and TMDTE are more appropriate than EC50 and IC50 for toxicity assessments, except for long exposure times. 相似文献
7.
8.
Lee Mi Jung Romero Sergio Velozo Craig A. Gruber-Baldini Ann L. Shulman Lisa M. 《Quality of life research》2019,28(6):1595-1603
Quality of Life Research - This study investigated the PROMIS Self-Efficacy Measure for Managing Chronic Conditions (PROMIS-SE) domain distributions and examined the factor structure of the... 相似文献
9.