全文获取类型
收费全文 | 233226篇 |
免费 | 49750篇 |
国内免费 | 3077篇 |
专业分类
耳鼻咽喉 | 2983篇 |
儿科学 | 12001篇 |
妇产科学 | 4257篇 |
基础医学 | 36671篇 |
口腔科学 | 8123篇 |
临床医学 | 26831篇 |
内科学 | 46346篇 |
皮肤病学 | 6500篇 |
神经病学 | 27936篇 |
特种医学 | 8548篇 |
外国民族医学 | 3篇 |
外科学 | 25927篇 |
综合类 | 17627篇 |
现状与发展 | 15篇 |
一般理论 | 8篇 |
预防医学 | 15102篇 |
眼科学 | 3538篇 |
药学 | 15599篇 |
58篇 | |
中国医学 | 13893篇 |
肿瘤学 | 14087篇 |
出版年
2024年 | 1430篇 |
2023年 | 2390篇 |
2022年 | 4653篇 |
2021年 | 7461篇 |
2020年 | 11327篇 |
2019年 | 15443篇 |
2018年 | 14929篇 |
2017年 | 16260篇 |
2016年 | 15559篇 |
2015年 | 15185篇 |
2014年 | 18981篇 |
2013年 | 19454篇 |
2012年 | 16839篇 |
2011年 | 17829篇 |
2010年 | 14778篇 |
2009年 | 11216篇 |
2008年 | 11595篇 |
2007年 | 10140篇 |
2006年 | 9382篇 |
2005年 | 8263篇 |
2004年 | 7493篇 |
2003年 | 6747篇 |
2002年 | 5466篇 |
2001年 | 4463篇 |
2000年 | 3060篇 |
1999年 | 1889篇 |
1998年 | 1395篇 |
1997年 | 1307篇 |
1996年 | 1258篇 |
1995年 | 1215篇 |
1994年 | 1032篇 |
1993年 | 924篇 |
1992年 | 836篇 |
1991年 | 657篇 |
1990年 | 598篇 |
1989年 | 495篇 |
1988年 | 496篇 |
1987年 | 444篇 |
1986年 | 387篇 |
1985年 | 504篇 |
1984年 | 416篇 |
1983年 | 259篇 |
1982年 | 340篇 |
1981年 | 306篇 |
1980年 | 250篇 |
1979年 | 206篇 |
1978年 | 128篇 |
1977年 | 101篇 |
1976年 | 86篇 |
1975年 | 40篇 |
排序方式: 共有10000条查询结果,搜索用时 46 毫秒
41.
目的通过研究肺表面活性物质(PS)结合持续气道正压通气(CPAP)治疗新生儿呼吸窘迫综合征(NRDS)的治疗效果,进一步指导NRDS的临床治疗。方法选取于2017年4月-2018年10月间在本院收治的80例确诊为新生儿呼吸窘迫综合征的患儿作为研究对象,随机将患儿分为试验组和对照组,对照组给予持续气道正压通气治疗,试验组在对照组的基础上联合使用PS治疗。结果试验组对于呼吸窘迫缓解的有效率明显高于对照组,在气管插管内滴入PS治疗后试验组的血气情况明显优于对照组,且试验组患儿副作用发生率明显低于对照组,以上指标差异具有统计学意义,P <0.05。结论 PS结合CPAP在新生儿呼吸窘迫综合征的治疗中疗效很好。 相似文献
42.
A. Glahn P. J. Proskynitopoulos S. Bleich T. Hillemacher 《Expert opinion on pharmacotherapy》2020,21(9):1083-1092
ABSTRACT
Introduction
Alcohol withdrawal syndrome is a common and life-threatening condition in patients suffering from alcohol use disorder. Treatment of this syndrome is challenging, especially in patients that are critically ill, either because of withdrawal symptoms or underlying conditions. For the treatment, several pharmacological agents exist, such as benzodiazepines, barbiturates, or dexmedetomidine. Nonetheless, as alcohol withdrawal syndromes can occur in every clinical setting, it is necessary to provide a guideline for clinicians confronted with this syndrome in varying clinical contexts. 相似文献43.
《Mayo Clinic proceedings. Mayo Clinic》2021,96(11):2856-2860
Although there have been several case reports and simulation models of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) transmission associated with air travel, there are limited data to guide testing strategy to minimize the risk of SARS-CoV-2 exposure and transmission onboard commercial aircraft. Among 9853 passengers with a negative SARS-CoV-2 polymerase chain reaction test performed within 72 hours of departure from December 2020 through May 2021, five (0.05%) passengers with active SARS-CoV-2 infection were identified with rapid antigen tests and confirmed with rapid molecular test performed before and after an international flight from the United States to Italy. This translates to a case detection rate of 1 per 1970 travelers during a time of high prevalence of active infection in the United States. A negative molecular test for SARS-CoV-2 within 72 hours of international airline departure results in a low probability of active infection identified on antigen testing during commercial airline flight. 相似文献
44.
Georg Hahn Sharon M. Lutz Julian Hecker Dmitry Prokopenko Michael H. Cho Edwin K. Silverman Scott T. Weiss Christoph Lange 《Genetic epidemiology》2021,45(1):82-98
locStra is an ‐package for the analysis of regional and global population stratification in whole‐genome sequencing (WGS) studies, where regional stratification refers to the substructure defined by the loci in a particular region on the genome. Population substructure can be assessed based on the genetic covariance matrix, the genomic relationship matrix, and the unweighted/weighted genetic Jaccard similarity matrix. Using a sliding window approach, the regional similarity matrices are compared with the global ones, based on user‐defined window sizes and metrics, for example, the correlation between regional and global eigenvectors. An algorithm for the specification of the window size is provided. As the implementation fully exploits sparse matrix algebra and is written in C++, the analysis is highly efficient. Even on single cores, for realistic study sizes (several thousand subjects, several million rare variants per subject), the runtime for the genome‐wide computation of all regional similarity matrices does typically not exceed one hour, enabling an unprecedented investigation of regional stratification across the entire genome. The package is applied to three WGS studies, illustrating the varying patterns of regional substructure across the genome and its beneficial effects on association testing. 相似文献
45.
Francesco Scolari Elisa Delbarba Domenico Santoro Loreto Gesualdo Antonello Pani Nadia Dallera Laila-Yasmin Mani Marisa Santostefano Sandro Feriozzi Marco Quaglia Giuliano Boscutti Angelo Ferrantelli Carmelita Marcantoni Patrizia Passerini Riccardo Magistroni Federico Alberici Gian Marco Ghiggeri Claudio Ponticelli Pietro Ravani for the RI-CYCLO Investigators 《Journal of the American Society of Nephrology : JASN》2021,32(4):972
46.
47.
48.
49.
50.