全文获取类型
收费全文 | 373285篇 |
免费 | 45487篇 |
国内免费 | 3210篇 |
专业分类
耳鼻咽喉 | 7242篇 |
儿科学 | 11070篇 |
妇产科学 | 6649篇 |
基础医学 | 32036篇 |
口腔科学 | 5707篇 |
临床医学 | 48984篇 |
内科学 | 93163篇 |
皮肤病学 | 10422篇 |
神经病学 | 37320篇 |
特种医学 | 15943篇 |
外国民族医学 | 13篇 |
外科学 | 75320篇 |
综合类 | 2748篇 |
现状与发展 | 73篇 |
一般理论 | 177篇 |
预防医学 | 23029篇 |
眼科学 | 8653篇 |
药学 | 16265篇 |
1篇 | |
中国医学 | 325篇 |
肿瘤学 | 26842篇 |
出版年
2024年 | 588篇 |
2023年 | 5697篇 |
2022年 | 2905篇 |
2021年 | 8135篇 |
2020年 | 8644篇 |
2019年 | 7000篇 |
2018年 | 12930篇 |
2017年 | 11268篇 |
2016年 | 12655篇 |
2015年 | 13522篇 |
2014年 | 22840篇 |
2013年 | 25822篇 |
2012年 | 22248篇 |
2011年 | 23016篇 |
2010年 | 19716篇 |
2009年 | 22590篇 |
2008年 | 21197篇 |
2007年 | 20311篇 |
2006年 | 22197篇 |
2005年 | 19486篇 |
2004年 | 17807篇 |
2003年 | 15571篇 |
2002年 | 15071篇 |
2001年 | 5508篇 |
2000年 | 4261篇 |
1999年 | 5042篇 |
1998年 | 6207篇 |
1997年 | 5487篇 |
1996年 | 5081篇 |
1995年 | 4792篇 |
1994年 | 3351篇 |
1993年 | 2964篇 |
1992年 | 2278篇 |
1991年 | 2255篇 |
1990年 | 1796篇 |
1989年 | 1865篇 |
1988年 | 1641篇 |
1987年 | 1424篇 |
1986年 | 1481篇 |
1985年 | 1354篇 |
1984年 | 1424篇 |
1983年 | 1277篇 |
1982年 | 1521篇 |
1981年 | 1348篇 |
1980年 | 1178篇 |
1979年 | 752篇 |
1978年 | 832篇 |
1977年 | 825篇 |
1976年 | 638篇 |
1975年 | 583篇 |
排序方式: 共有10000条查询结果,搜索用时 203 毫秒
951.
Siu Fai Li MD Nashat Latib MD Angela Kwong MD Shreni Zinzuwadia MD Ethan Cowan MD 《Academic emergency medicine》2007,14(12):1194-1196
Background In recent years, the number of women entering the field of emergency medicine (EM) has increased.
Objectives To determine if authorship in EM publications has increased in parallel with this trend.
Methods The gender of first and last authors of EM articles in Academic Emergency Medicine , American Journal of Emergency Medicine , Annals of Emergency Medicine , and Journal of Emergency Medicine were examined. The authors reviewed articles from 1985, 1995, and 2005 for American Journal of Emergency Medicine , Annals of Emergency Medicine , and Journal of Emergency Medicine and from 1999 and 2005 for Academic Emergency Medicine . The primary outcomes were the proportions of female authors.
Results A total of 2,016 articles were reviewed. Overall, 18% of first and last authors were female. Respectively, for 1985, 1995, 1999, and 2005, the proportions of female first authors were 9%, 15%, 19%, and 24%; the proportions of female last authors were 9%, 18%, 19%, and 22%. The trend of increases in female authorship was statistically significant.
Conclusions Although female authorship remains a minority in EM publications, it has increased significantly in parallel with increases in female participation in EM. 相似文献
Objectives To determine if authorship in EM publications has increased in parallel with this trend.
Methods The gender of first and last authors of EM articles in Academic Emergency Medicine , American Journal of Emergency Medicine , Annals of Emergency Medicine , and Journal of Emergency Medicine were examined. The authors reviewed articles from 1985, 1995, and 2005 for American Journal of Emergency Medicine , Annals of Emergency Medicine , and Journal of Emergency Medicine and from 1999 and 2005 for Academic Emergency Medicine . The primary outcomes were the proportions of female authors.
Results A total of 2,016 articles were reviewed. Overall, 18% of first and last authors were female. Respectively, for 1985, 1995, 1999, and 2005, the proportions of female first authors were 9%, 15%, 19%, and 24%; the proportions of female last authors were 9%, 18%, 19%, and 22%. The trend of increases in female authorship was statistically significant.
Conclusions Although female authorship remains a minority in EM publications, it has increased significantly in parallel with increases in female participation in EM. 相似文献
952.
Hidemi Yamauchi MD Kikuo Miyagawa Masamitsu Maeda Seiki Matsuno Toshio Sato 《Surgery today》1986,16(1):8-15
The findings in twenty-two patients with insulinoma were reviewed, as continuous efforts should be made to establish preoperative
localization of the tumor. Superselective arteriography and percutaneous, transhepatic portal vein and pancreatic venous catheterization
are highly recommended approaches. At the time of surgical intervention, a cautious exploration of the pancreas after thorough
mobilization is most important. Recent use of intraoperative ultrasonography increases the likelihood of finding these occult
tumors which locate deeply in the head of the pancreas. Apart from the diagnostic problems, we wish to emphasize the high
incidence of malignancy (7/22, 31.8 per cent) in our series. Althout patients with malignant isulinoma had a much better prognosis
compared to those with a pancreatic ductal malignancy, pancreatic resection with regional lymphnode dissection seems to be
a rational procedure. Enucleation can be done when intraoperative findings of the tumor and regional lymphonode indicate no
malignant features and no multiple lesions. However, at the first operation, enucleation is still a procedure of choice, even
for the malignant insulinoma in the head with a well-defined capsule and no metastatic lesions, the objective being to avoid
a duodenopancreatectomy or total pancreatectomy.
These data were reported at the 30th Congress of Société Internationale de Chirurgie, Hamburg, Germany, 1983 相似文献
953.
Rony Gelman Lei Jiang Yunling E Du M Elena Martinez-Perez John T Flynn Michael F Chiang 《Journal of AAPOS》2007,11(6):532-540
PURPOSE: To measure accuracy of plus disease diagnosis by recognized experts in retinopathy of prematurity (ROP), and to conduct a pilot study examining performance of a computer-based image analysis system, Retinal Image multiScale Analysis (RISA). METHODS: Twenty-two ROP experts independently interpreted a set of 34 wide-angle retinal images for presence of plus disease. A reference standard diagnosis based on expert consensus was defined for each image. Images were analyzed by the computer-based system using individual and linear combinations of system parameters for arterioles and venules: integrated curvature (IC), diameter, and tortuosity index (TI). Sensitivity, specificity, and receiver operating characteristic areas under the curve (AUC) for plus disease diagnosis compared with the reference standard were determined for each expert, as well as for the computer-based system. RESULTS: Expert sensitivity ranged from 0.308 to 1.000, specificity ranged from 0.571 to 1.000, and AUC ranged from 0.784 to 1.000. Among individual computer system parameters, venular IC had highest AUC (0.853). Among all computer system parameters, the linear combination of arteriolar IC, arteriolar TI, venular IC, venular diameter, and venular TI had highest AUC (0.967), which was greater than that of 18 (81.8%) of 22 experts. CONCLUSIONS: Accuracy of ROP experts for plus disease diagnosis is imperfect. A computer-based image analysis system has potential to diagnose plus disease with high accuracy. Further research involving RISA system parameter cut-off values from this study are required to fully validate performance of this computer-based system compared with that of human experts. 相似文献
954.
Bernard Stuart Declan Fox Harry Murphy Bryan Lynch J. Loftus E. Naughten I. Saul O. Sheil N. Duignan A. Jackson W. A. Gorman G. Fox T. Matthews T. Clarke Mark M. Reid H. L. Halliday B. G. McClure P. S. Thomas Michael O’Dowd Michael J. O’Dowd Kevin Connolly F. Leahy Dr. R. G. White Ruth Connolly Colm O’Herlihy Alicja Radic Dr. 《Irish journal of medical science》1986,155(6):209-212
955.
Werner E Bischoff Brian K Tucker Michelle L Wallis Beth A Reboussin Michael A Pfaller Frederick G Hayden Robert J Sherertz 《Infection control and hospital epidemiology》2007,28(10):1148-1154
OBJECTIVE: Transmission of Staphylococcus aureus via air may play an important role in healthcare settings. This study investigates the impact of barrier precautions on the spread of airborne S. aureus by volunteers with experimentally induced rhinovirus infection (ie, the common cold). DESIGN: Prospective nonrandomized study. SETTING: Wake Forest University School of Medicine (Winston-Salem, NC).Participants. A convenience sample of 10 individuals with nasal S. aureus carriage selected from 593 students screened for carriage. INTERVENTION: Airborne S. aureus dispersal was studied in the 10 participants under the following clothing conditions: street clothes, surgical scrubs, surgical scrubs and a gown, and the latter plus a face mask. After a 4-day baseline period, volunteers were exposed to a rhinovirus, and their clinical course was followed for 12 days. Daily swabs of nasal specimens, pharynx specimens, and skin specimens were obtained for quantitative culture, and cold symptoms were documented. Data were analyzed by random-effects negative binomial models. RESULTS: All participants developed a common cold. Incidence rate ratios (IRRs) indicated that, compared with airborne levels of S. aureus during sessions in which street clothes were worn, airborne levels decreased by 75% when surgical scrubs were worn (P<.001), by 80% when scrubs and a surgical gown were worn (P<.001), and by 82% when scrubs, a gown, and a face mask were worn (P<.001). The addition of a mask to the surgical scrubs and gown did not reduce the airborne dispersal significantly (IRR, 0.92; P>.05). Male volunteers shed twice as much S. aureus as females (incidence rate ratio, 2.04; P=.013). The cold did not alter the efficacy of the barrier precautions. CONCLUSIONS: Scrubs reduced the spread of airborne S. aureus, independent of the presence of a rhinovirus-induced cold. Airborne dispersal of S. aureus during sessions in which participants wore surgical scrubs was not significantly different from that during sessions in which gowns and gowns plus masks were also worn. 相似文献
956.
957.
Steven JY Wang Claire Cornick Jacqueline O'Dowd Michael A Cawthorne Jonathan R S Arch 《Lipids in health and disease》2007,6(1):2
Background
Mice that lack acyl CoA:diacylglycerol acyltransferase (Dgat1 -/- mice) are reported to have a reduced body fat content and improved glucose tolerance and insulin sensitivity. Studies so far have focussed on male null mice fed a high fat diet and there are few data on heterozygotes. We compared male and female Dgat1 -/-, Dgat1 +/- and Dgat1 +/+ C57Bl/6 mice fed on either standard chow or a high fat diet. 相似文献958.
959.
960.