全文获取类型
收费全文 | 2501篇 |
免费 | 135篇 |
国内免费 | 76篇 |
专业分类
耳鼻咽喉 | 2篇 |
儿科学 | 174篇 |
妇产科学 | 34篇 |
基础医学 | 327篇 |
口腔科学 | 59篇 |
临床医学 | 300篇 |
内科学 | 571篇 |
皮肤病学 | 73篇 |
神经病学 | 101篇 |
特种医学 | 446篇 |
外科学 | 103篇 |
综合类 | 46篇 |
预防医学 | 100篇 |
眼科学 | 53篇 |
药学 | 164篇 |
2篇 | |
中国医学 | 13篇 |
肿瘤学 | 144篇 |
出版年
2022年 | 9篇 |
2021年 | 16篇 |
2020年 | 18篇 |
2019年 | 18篇 |
2018年 | 40篇 |
2017年 | 26篇 |
2016年 | 36篇 |
2015年 | 48篇 |
2014年 | 59篇 |
2013年 | 71篇 |
2012年 | 54篇 |
2011年 | 63篇 |
2010年 | 102篇 |
2009年 | 100篇 |
2008年 | 71篇 |
2007年 | 103篇 |
2006年 | 65篇 |
2005年 | 72篇 |
2004年 | 43篇 |
2003年 | 36篇 |
2002年 | 45篇 |
2001年 | 54篇 |
2000年 | 50篇 |
1999年 | 37篇 |
1998年 | 135篇 |
1997年 | 159篇 |
1996年 | 135篇 |
1995年 | 115篇 |
1994年 | 119篇 |
1993年 | 103篇 |
1992年 | 44篇 |
1991年 | 50篇 |
1990年 | 47篇 |
1989年 | 64篇 |
1988年 | 53篇 |
1987年 | 48篇 |
1986年 | 53篇 |
1985年 | 49篇 |
1984年 | 29篇 |
1983年 | 15篇 |
1982年 | 25篇 |
1981年 | 31篇 |
1980年 | 26篇 |
1979年 | 7篇 |
1978年 | 14篇 |
1977年 | 22篇 |
1976年 | 27篇 |
1975年 | 17篇 |
1969年 | 9篇 |
1960年 | 7篇 |
排序方式: 共有2712条查询结果,搜索用时 0 毫秒
21.
Meniscal abnormalities: prospective correlation of double-contrast arthrography and arthroscopy 总被引:2,自引:0,他引:2
In a prospective study conducted over a 12-month period, 30 patients underwent double-contrast arthrography of the knee followed by arthroscopic study. An 80% correlation rate was found between results. Arthrography had a higher rate of accuracy (93%) than arthroscopy (84%) and had a 7% false-positive and 0% false-negative rate. A commonly overlooked arthrographic sign--the triple-S or stuck sail sign--was 91% accurate in the prediction of meniscal tears. The complementary nature of the two examinations is discussed. 相似文献
22.
23.
The patellofemoral joint was imaged with magnetic resonance (MR) in the axial plane while the knee was positioned from 0 degrees to 32 degrees of flexion (nine positions). These multiple sequential images obtained within the early phases of flexion of the knee were viewed in a "cine-loop" format, producing a kinematic study that clearly demonstrated the relationship of the patella to the trochlear groove. Four healthy subjects and one patient with known bilateral subluxing patellae were studied. The preliminary results suggest that kinematic MR imaging of the patellofemoral joint is potentially useful for the evaluation of patellar tracking abnormalities. 相似文献
24.
Tortoriello DV; McGovern PG; Colon JM; Loughlin J; Santoro N 《Human reproduction (Oxford, England)》1998,13(11):3005-3008
We report an instance of critical ovarian hyperstimulation syndrome in a
highly responsive in-vitro fertilization patient despite the preventive
measure of a 4 day 'coast' interval during which no gonadotrophins were
administered while gonadotrophin-releasing hormone agonist therapy
continued until serum oestradiol concentrations fell below 3000 pg/ml.
相似文献
25.
Incidence and determinants of moderate COPD (GOLD II) in male smokers aged 40–65 years: 5-year follow up 下载免费PDF全文
Roeland MM Geijer Alfred PE Sachs Theo JM Verheij Philippe L Salom Jan-Willem J Lammers Arno W Hoes 《The British journal of general practice》2006,56(530):656-661
BACKGROUND: Chronic obstructive pulmonary disease (COPD) is a major health problem with an estimated prevalence of 10-15% among smokers. The incidence of moderate COPD, as defined by the Global Initiative for Chronic Obstructive Lung Disease (GOLD), is largely unknown. AIM: To determine the cumulative incidence of moderate COPD (forced expiratory volume in 1 second/forced vital capacity ratio [FEV1/FVC] <0.7 and FEV1 <80% predicted) and its association with patient characteristics in a cohort of male smokers. DESIGN: Prospective cohort study. SETTING: The city of IJsselstein, a small town in the Netherlands. METHOD: Smokers aged 40-65 years who were registered with local GPs, participated in a study to identify undetected COPD. Baseline measurements were taken in 1998 of 399 smokers with normal spirometry (n = 292) or mild COPD (FEV1/FVC <0.7 and FEV1 >or=80% predicted, n = 107) and follow-up measurements were conducted in 2003. RESULTS: After a mean follow-up of 5.2 years, 33 participants developed moderate COPD (GOLD II). This showed an estimated cumulative incidence of 8.3% (95% CI = 5.8 to 11.4) and a mean annual incidence of 1.6%. No participant developed severe airflow obstruction. The risk of developing moderate COPD in smokers with baseline mild COPD (GOLD I) was five times higher than in those with baseline normal spirometry (one in five versus one in 25). CONCLUSIONS: In a cohort of middle-aged male smokers, the estimated cumulative incidence of moderate COPD (GOLD II) over 5 years was relatively high (8.3%). Age, childhood smoking, cough, and one or more GP contacts for lower respiratory tract problems were independently associated with incident moderate COPD. 相似文献
26.
27.
A. Fleckenstein E. Gerlach Johanna Janke P. Marmier 《Pflügers Archiv : European journal of physiology》1960,271(1):75-104
Ohne ZusammenfassungMit 7 TextabbildungenDie vorliegenden Studien am Physiologischen Institut Freiburg i. Br. wurden durch einen Bundeszuschuß des Ministeriums für Atomkernenergie und Wasserwirtschaft (Bonn) ermöglicht. Die Untersuchungen in Zürich wurden aus Mitteln des Schweizer Nationalfonds getragen. Den genannten Institutionen gilt unser besonderer Dank. Vorläufige Mitteilungen über die Methode und die hier dargestellten Ergebnisse wurden bereits früher gegeben [siehe Fleckenstein, A. E. Gerlach, u. J. Janke gemeinsam mit P. Marmier: Naturwissenschaften 46, 365 (1959); Pflügers Arch. ges. Physiol. 270, 20 (1959); P. Marmier gemeinsam mit E. Gerlach, J. Janke u. A. Fleckenstein: Pflügers Arch. ges. Physiol. 270, 19 (1959); A. Fleckenstein: University of London Special University Lectures in Physiology 26–28. Oct. 1959: The turnover rates of high energy phosphate compounds during activity and rest as indicated by the oxygen exchange with H2O18. Bericht von E. Gerlach sowie von J. Janke vor der Freiburger Med. Ges. vom 24. 11. 1959, vgl. Klin. Wschr. 38, 341–342 (1960)]. 相似文献
28.
M Avellanet RM Mirapeix D Escudero C Riera JM Domenech-Mateu 《Surgical and radiologic anatomy : SRA》1996,18(4):271-273
Summary We present a case with a characteristic magnetic resonance image (MRI) of bilateral open-lipped schizencephaly and atypical clinical presentation. The patient is still alive and in good health in her forties, she has never presented seizures, and although the motor dysfunction is well correlated with cerebral lobe involvement, neurobehavioral dysfunction is not proportional to the MR image of the cerebral malformation.
Un cas inhabituel de schizencéphalie bilatérale
Résumé Nous présentons un cas de schizencéphalie bilatérale ouverte caractérisé par une présentation clinique atypique et une imagerie par résonance magnétique nucléaire caractéristique. La patiente est encore vivante, en bonne santé, à plus de 40 ans, elle n'a jamais présenté de crise comitiale et, bien que les troubles moteurs soient bien corrélés aux altérations cérébrales, les troubles neuro-comportementaux ne sont pas proportionnels aux images IRM de cette malformation cérébrale.相似文献
29.
30.