全文获取类型
收费全文 | 163845篇 |
免费 | 13223篇 |
国内免费 | 750篇 |
学科分类
医药卫生 | 177818篇 |
出版年
2023年 | 1183篇 |
2022年 | 915篇 |
2021年 | 3453篇 |
2020年 | 2443篇 |
2019年 | 3430篇 |
2018年 | 4370篇 |
2017年 | 3428篇 |
2016年 | 3848篇 |
2015年 | 4344篇 |
2014年 | 5942篇 |
2013年 | 8235篇 |
2012年 | 11473篇 |
2011年 | 12154篇 |
2010年 | 6938篇 |
2009年 | 6587篇 |
2008年 | 10631篇 |
2007年 | 11114篇 |
2006年 | 10482篇 |
2005年 | 10545篇 |
2004年 | 9800篇 |
2003年 | 9046篇 |
2002年 | 8657篇 |
2001年 | 1593篇 |
2000年 | 1127篇 |
1999年 | 1643篇 |
1998年 | 2085篇 |
1997年 | 1793篇 |
1996年 | 1469篇 |
1995年 | 1400篇 |
1994年 | 1139篇 |
1993年 | 1060篇 |
1992年 | 853篇 |
1991年 | 784篇 |
1990年 | 692篇 |
1989年 | 672篇 |
1988年 | 642篇 |
1987年 | 600篇 |
1986年 | 521篇 |
1985年 | 590篇 |
1984年 | 658篇 |
1983年 | 600篇 |
1982年 | 765篇 |
1981年 | 692篇 |
1980年 | 602篇 |
1979年 | 400篇 |
1978年 | 373篇 |
1977年 | 386篇 |
1976年 | 324篇 |
1975年 | 286篇 |
1974年 | 299篇 |
排序方式: 共有10000条查询结果,搜索用时 46 毫秒
51.
52.
Umar Nadia K. Badshah Maaz B. Sandrasegaran Kumar Ghabril Marwan Agarwal Saurabh Tann Mark Lacerda Marco Kwo Paul Y. 《Digestive diseases and sciences》2015,60(7):2196-2200
Digestive Diseases and Sciences - To determine whether the presence of portal vein thrombosis (PVT) where venous flow within the liver may be altered may delay the diagnosis of HCC and be... 相似文献
53.
Grulois Daphné Tiavouane Josina Dumas Pascal Paul Fauvelot Cécile 《Conservation Genetics Resources》2015,7(1):73-75
Conservation Genetics Resources - Fifteen polymorphic microsatellite markers were developed for Tridacna maxima in order to assess self-recruitment and larval dispersal within and among MPAs in New... 相似文献
54.
Julie A. Schmidt Georgina K. Fensom Sabina Rinaldi Augustin Scalbert Paul N. Appleby David Achaintre Audrey Gicquiau Marc J. Gunter Pietro Ferrari Rudolf Kaaks Tilman Kühn Heiner Boeing Antonia Trichopoulou Anna Karakatsani Eleni Peppa Domenico Palli Sabina Sieri Rosario Tumino Bas Bueno-de-Mesquita Antonio Agudo Maria-Jose Sánchez María-Dolores Chirlaque Eva Ardanaz Nerea Larrañaga Aurora Perez-Cornago Nada Assi Elio Riboli Konstantinos K. Tsilidis Timothy J. Key Ruth C. Travis 《International journal of cancer. Journal international du cancer》2020,146(3):720-730
Metabolomics may reveal novel insights into the etiology of prostate cancer, for which few risk factors are established. We investigated the association between patterns in baseline plasma metabolite profile and subsequent prostate cancer risk, using data from 3,057 matched case–control sets from the European Prospective Investigation into Cancer and Nutrition (EPIC). We measured 119 metabolite concentrations in plasma samples, collected on average 9.4 years before diagnosis, by mass spectrometry (AbsoluteIDQ p180 Kit, Biocrates Life Sciences AG). Metabolite patterns were identified using treelet transform, a statistical method for identification of groups of correlated metabolites. Associations of metabolite patterns with prostate cancer risk (OR1SD) were estimated by conditional logistic regression. Supplementary analyses were conducted for metabolite patterns derived using principal component analysis and for individual metabolites. Men with metabolite profiles characterized by higher concentrations of either phosphatidylcholines or hydroxysphingomyelins (OR1SD = 0.77, 95% confidence interval 0.66–0.89), acylcarnitines C18:1 and C18:2, glutamate, ornithine and taurine (OR1SD = 0.72, 0.57–0.90), or lysophosphatidylcholines (OR1SD = 0.81, 0.69–0.95) had lower risk of advanced stage prostate cancer at diagnosis, with no evidence of heterogeneity by follow-up time. Similar associations were observed for the two former patterns with aggressive disease risk (the more aggressive subset of advanced stage), while the latter pattern was inversely related to risk of prostate cancer death (OR1SD = 0.77, 0.61–0.96). No associations were observed for prostate cancer overall or less aggressive tumor subtypes. In conclusion, metabolite patterns may be related to lower risk of more aggressive prostate tumors and prostate cancer death, and might be relevant to etiology of advanced stage prostate cancer. 相似文献
55.
M. Masson Regnault J. Castañeda-Sanabria M.H.T. Diep Tran M. Beylot-Barry H. Bachelez N. Beneton O. Chosidow A. Dupuy P. Joly D. Jullien E. Mahé M.-A. Richard M. Viguier F. Tubach E. Sbidian C. Paul The PsoBioTeq Study Group 《Journal of the European Academy of Dermatology and Venereology》2020,34(2):293-300
56.
57.
58.
Heather M Arthur Christine Patterson James A Stone 《European journal of cardiovascular prevention and rehabilitation》2006,13(1):3-9
BACKGROUND: Presently, complementary and alternative medicine, including both therapies and herbal/oral supplements, is used globally. Few studies have examined the use of specific therapies, separate from herbal/oral supplements, in cardiac rehabilitation. This paper presents a systematic evaluation of current research evidence related to use of specific complementary and alternative medicine therapies in secondary prevention of cardiovascular disease, with a view to making recommendations for cardiac rehabilitation. DESIGN AND METHODS: A literature search was conducted using complementary and alternative medicine websites, Medline, Allied and Complementary Medicine, CINAHL, Cochrane databases, EMBASE, SportDiscus, Clinical Evidence, and Evidence-Based Practice to locate research-based scientific evidence related to the use of complementary and alternative medicine in cardiac rehabilitation. Search keywords included heart, cardiac, cardiovascular, coronary, myocardial and rehabilitation, combined with particular therapies. Herbal/oral supplements were not included in this evaluation. RESULTS: Some complementary and alternative medicine therapies may be useful to patients by themselves or coupled with traditional cardiac rehabilitation. Tai chi, as a complement to existing exercise interventions, can be utilized for low and intermediate risk patients. transcendental meditation may be used as a stress reduction technique. There was insufficient evidence found for the use of acupuncture or chelation therapy in cardiac rehabilitation or secondary prevention. CONCLUSIONS: Some complementary and alternative medicine therapies hold promise for patients in cardiac rehabilitation. Further research is essential, however, in all areas of complementary and alternative medicine to confirm its usefulness as an adjunct to cardiac rehabilitation. 相似文献
59.
Osseointegrated Implant Anchorage in a Growing Adolescent 总被引:1,自引:0,他引:1
60.