全文获取类型
收费全文 | 60761篇 |
免费 | 4410篇 |
国内免费 | 222篇 |
专业分类
耳鼻咽喉 | 654篇 |
儿科学 | 1614篇 |
妇产科学 | 1571篇 |
基础医学 | 8091篇 |
口腔科学 | 2766篇 |
临床医学 | 5404篇 |
内科学 | 14498篇 |
皮肤病学 | 1266篇 |
神经病学 | 5174篇 |
特种医学 | 1409篇 |
外国民族医学 | 1篇 |
外科学 | 8687篇 |
综合类 | 757篇 |
一般理论 | 30篇 |
预防医学 | 5086篇 |
眼科学 | 950篇 |
药学 | 3945篇 |
中国医学 | 168篇 |
肿瘤学 | 3322篇 |
出版年
2023年 | 356篇 |
2022年 | 747篇 |
2021年 | 1670篇 |
2020年 | 933篇 |
2019年 | 1369篇 |
2018年 | 1629篇 |
2017年 | 1097篇 |
2016年 | 1246篇 |
2015年 | 1466篇 |
2014年 | 2163篇 |
2013年 | 2734篇 |
2012年 | 4179篇 |
2011年 | 4308篇 |
2010年 | 2548篇 |
2009年 | 2209篇 |
2008年 | 3545篇 |
2007年 | 3714篇 |
2006年 | 3559篇 |
2005年 | 3349篇 |
2004年 | 3037篇 |
2003年 | 2775篇 |
2002年 | 2512篇 |
2001年 | 958篇 |
2000年 | 866篇 |
1999年 | 914篇 |
1998年 | 568篇 |
1997年 | 515篇 |
1996年 | 439篇 |
1995年 | 435篇 |
1994年 | 337篇 |
1993年 | 302篇 |
1992年 | 642篇 |
1991年 | 619篇 |
1990年 | 525篇 |
1989年 | 591篇 |
1988年 | 509篇 |
1987年 | 455篇 |
1986年 | 504篇 |
1985年 | 433篇 |
1984年 | 371篇 |
1983年 | 402篇 |
1982年 | 234篇 |
1981年 | 221篇 |
1980年 | 204篇 |
1979年 | 289篇 |
1978年 | 242篇 |
1977年 | 218篇 |
1976年 | 201篇 |
1974年 | 189篇 |
1973年 | 212篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Rizzo Manglio Miguel Bluthgen Mara Virginia Recondo Gonzalo Naveira Martin Perfetti Aldo Rizzi Florencia Kuzminin Alejandro Faura Victoria Cerini Matas Videla Alejandro Silva Carlos Lupinacci Lorena Minatta Nicols 《International journal of clinical oncology / Japan Society of Clinical Oncology》2021,26(6):1057-1064
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.
Rocha Déborah Ribeiro Nery Jaqueline Freire Furini Leonardo Negri Constantino Carlos José Leopoldo Eller Lizziane Kretli Winkelströter Nai Gisele Alborghetti Nakagaki Wilson Romero 《Lasers in medical science》2020,35(8):1703-1709
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
3.
4.
Zaida Araujo Sietze Brandes Elena Pinelli María A. Bochichio Andrea Palacios Albina Wide Bruno Rivas-Santiago Juan Carlos Jiménez 《Revista do Instituto de Medicina Tropical de S?o Paulo》2015,57(1):47-55
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
5.
Ariel Paracampo Marina Solis Carlos Bonetto 《International journal of environmental health research》2015,25(1):96-103
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
6.
7.
8.
Michael E Egger Joanna M Ohlendorf Charles R Scoggins Kelly M McMasters Robert C G Martin II 《HPB : the official journal of the International Hepato Pancreato Biliary Association》2015,17(9):839-845
BackgroundThe aim of this paper is to assess the current state of quality and outcomes measures being reported for hepatic resections in the recent literature.MethodsMedline and PubMed databases were searched for English language articles published between 1 January 2002 and 30 April 2013. Two examiners reviewed each article and relevant citations for appropriateness of inclusion, which excluded papers of liver donor hepatic resections, repeat hepatectomies or meta-analyses. Data were extracted and summarized by two examiners for analysis.ResultsFifty-five studies were identified with suitable reporting to assess peri-operative mortality in hepatic resections. In only 35% (19/55) of the studies was the follow-up time explicitly stated, and in 47% (26/55) of studies peri-operative mortality was limited to in-hospital or 30 days. The time period in which complications were captured was not explicitly stated in 19 out of 28 studies. The remaining studies only captured complications within 30 days of the index operation (8/28). There was a paucity of quality literature addressing truly patient-centred outcomes.ConclusionQuality outcomes after a hepatic resection are inconsistently reported in the literature. Quality outcome studies for a hepatectomy should report mortality and morbidity at a minimum of 90 days after surgery. 相似文献
9.
10.
Andrea Stracciolini Jennifer Luz Gregory Walker Nicholas M. Edwards Avery D. Faigenbaum Gregory D. Myer 《The Physician and sportsmedicine》2020,48(2):199-207
ABSTRACT