全文获取类型
收费全文 | 155344篇 |
免费 | 10667篇 |
国内免费 | 1547篇 |
专业分类
耳鼻咽喉 | 1666篇 |
儿科学 | 4039篇 |
妇产科学 | 2428篇 |
基础医学 | 21444篇 |
口腔科学 | 2703篇 |
临床医学 | 15521篇 |
内科学 | 31203篇 |
皮肤病学 | 2274篇 |
神经病学 | 14288篇 |
特种医学 | 5398篇 |
外国民族医学 | 6篇 |
外科学 | 21409篇 |
综合类 | 4134篇 |
现状与发展 | 8篇 |
一般理论 | 165篇 |
预防医学 | 12459篇 |
眼科学 | 4126篇 |
药学 | 12134篇 |
16篇 | |
中国医学 | 1339篇 |
肿瘤学 | 10798篇 |
出版年
2023年 | 898篇 |
2022年 | 1545篇 |
2021年 | 3865篇 |
2020年 | 2260篇 |
2019年 | 3324篇 |
2018年 | 3861篇 |
2017年 | 2889篇 |
2016年 | 3452篇 |
2015年 | 4256篇 |
2014年 | 5785篇 |
2013年 | 7543篇 |
2012年 | 11295篇 |
2011年 | 12014篇 |
2010年 | 6668篇 |
2009年 | 6054篇 |
2008年 | 10010篇 |
2007年 | 10384篇 |
2006年 | 9731篇 |
2005年 | 9686篇 |
2004年 | 8890篇 |
2003年 | 8116篇 |
2002年 | 7679篇 |
2001年 | 1894篇 |
2000年 | 1621篇 |
1999年 | 1807篇 |
1998年 | 1714篇 |
1997年 | 1444篇 |
1996年 | 1115篇 |
1995年 | 1104篇 |
1994年 | 933篇 |
1993年 | 889篇 |
1992年 | 826篇 |
1991年 | 778篇 |
1990年 | 680篇 |
1989年 | 607篇 |
1988年 | 590篇 |
1987年 | 563篇 |
1986年 | 491篇 |
1985年 | 545篇 |
1984年 | 596篇 |
1983年 | 559篇 |
1982年 | 727篇 |
1981年 | 630篇 |
1980年 | 555篇 |
1979年 | 399篇 |
1978年 | 365篇 |
1977年 | 364篇 |
1976年 | 304篇 |
1975年 | 284篇 |
1974年 | 296篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
51.
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
52.
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
53.
54.
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
55.
56.
57.
Tinghu Kang Yang Li Jiandong Guo Xingwen Ma Fatema Akhter Hiramoni Md Zahir Ahmed Mary C. Jobe Oli Ahmed 《International Journal of Mental Health Promotion, The》2022,24(2):207-217
The aim of the study was to explore the relationship between college graduates’ dual self-consciousness, job search
clarity and perceived stress, and reveal the mediating role of perceived stress between dual self-consciousness and
job search clarity. In this study, 467 college graduates were investigated using the Dual Self-Consciousness Scale,
Job Search Clarity Scale, and Perceived Stress Scale. After controlling for gender, age, and region, the results
revealed that: (1) private self-consciousness has a significant positive predictive effect on job search clarity; (2)
perceived stress has a significant negative predictive effect on job search clarity; (3) perceived stress plays partial
mediation effects between private self-consciousness and job search clarity; (4) perceived stress plays complete
mediation effects between public self-consciousness and job search clarity; (5) perceived stress has suppressing
effects between public self-consciousness and job search clarity. 相似文献
58.
59.
60.
Thomas S. Klitzner Maggie Lee Sandra Rodriguez Ruey‐Kang R. Chang 《Congenital heart disease》2006,1(3):77-88
Background. It has been reported that gender differences in cardiovascular outcomes found in adults also are present in children who undergo surgical repair for congenital heart disease. Methods. California statewide hospital discharge data 1989–99 were used to study outcomes in children <18 years undergoing cardiac surgery. Hospital discharge data were linked to death registry data to study postdischarge death within 30 days of discharge. We used logistic regression to evaluate the effect of gender on mortality controlling for age, race and ethnicity, type of insurance, household income, date and month of surgery, type of admission, hospital case volume, and various types of procedures. Results. There were 25 402 cardiac surgery cases with 1505 in‐hospital deaths (mortality rate of 5.92%). An additional 37 deaths occurred within 30 days after hospital discharge. Crude mortality rates for males (5.99%) and females (5.84%) were not significantly different. However, fewer neonates were female and females underwent a higher proportion of low‐risk procedures than males. Logistic regression revealed that females, compared with males, had a significantly higher odds ratio (OR) for in‐hospital mortality (OR = 1.18, P < .01) and overall (up to 30 days post discharge) mortality (OR = 1.18, P < .01). The risk‐adjusted length of hospital stay was similar between females and males while charges per hospital day were slightly higher in females than males. The prevalence of Down syndrome, pulmonary hypertension, and failure to thrive were higher in females. Conclusions. Female gender is associated with an 18% higher in‐hospital and 30‐day postdischarge mortality as compared with male gender. There was no difference in length of hospital stay between males and females. The mechanism by which female gender acts as a risk factor requires further investigation. 相似文献