全文获取类型
收费全文 | 2053篇 |
免费 | 280篇 |
国内免费 | 22篇 |
专业分类
耳鼻咽喉 | 11篇 |
儿科学 | 79篇 |
妇产科学 | 26篇 |
基础医学 | 151篇 |
口腔科学 | 74篇 |
临床医学 | 287篇 |
内科学 | 518篇 |
皮肤病学 | 53篇 |
神经病学 | 90篇 |
特种医学 | 306篇 |
外科学 | 158篇 |
综合类 | 19篇 |
预防医学 | 365篇 |
眼科学 | 24篇 |
药学 | 58篇 |
中国医学 | 2篇 |
肿瘤学 | 134篇 |
出版年
2023年 | 50篇 |
2022年 | 17篇 |
2021年 | 18篇 |
2020年 | 45篇 |
2019年 | 23篇 |
2018年 | 66篇 |
2017年 | 41篇 |
2016年 | 57篇 |
2015年 | 65篇 |
2014年 | 105篇 |
2013年 | 146篇 |
2012年 | 65篇 |
2011年 | 81篇 |
2010年 | 81篇 |
2009年 | 95篇 |
2008年 | 75篇 |
2007年 | 92篇 |
2006年 | 73篇 |
2005年 | 64篇 |
2004年 | 55篇 |
2003年 | 25篇 |
2002年 | 32篇 |
2001年 | 31篇 |
2000年 | 36篇 |
1999年 | 44篇 |
1998年 | 69篇 |
1997年 | 92篇 |
1996年 | 85篇 |
1995年 | 62篇 |
1994年 | 65篇 |
1993年 | 55篇 |
1992年 | 23篇 |
1991年 | 18篇 |
1990年 | 34篇 |
1989年 | 52篇 |
1988年 | 40篇 |
1987年 | 44篇 |
1986年 | 35篇 |
1985年 | 35篇 |
1984年 | 15篇 |
1983年 | 15篇 |
1982年 | 24篇 |
1981年 | 31篇 |
1980年 | 18篇 |
1979年 | 7篇 |
1978年 | 5篇 |
1977年 | 15篇 |
1976年 | 15篇 |
1975年 | 10篇 |
1967年 | 2篇 |
排序方式: 共有2355条查询结果,搜索用时 0 毫秒
991.
Boot W. Gawlitta D. Nikkels P. G. J. Pouran B. van Rijen M. H. P. Dhert W. J. A. Vogely H. Ch. 《Clinical orthopaedics and related research》2017,475(7):1911-1919
Clinical Orthopaedics and Related Research® - Uncemented orthopaedic implants rely on the bone-implant interface to provide stability, therefore it is essential that a coating does not... 相似文献
992.
Benjamin R. Campbell MD Zhishan Chen PhD Daniel L. Faden MD Nishant Agrawal MD Ryan J. Li MD Glenn J. Hanna MD N. Gopalakrishna Iyer MD PhD Arnoud Boot PhD Steven G. Rozen PhD Andre L. Vettore PhD Binay Panda PhD Neeraja M. Krishnan PhD Curtis R. Pickering PhD Jeffrey N. Myers MD PhD Xingyi Guo PhD Krystle A. Lang Kuhs PhD MPH 《Cancer》2021,127(4):544-553
993.
Rhodococcus (formerly Corynebacterium) equi, a common animal pathogen, can cause a slowly evolving pneumonia in humans, particularly immunocompromised people. The authors describe two patients; one with acquired immunodeficiency syndrome. On chest radiographs, R. equi produces chronic, localized pulmonary opacities that can cavitate. The main differential diagnoses are tuberculosis and fungal infection. 相似文献
994.
Swartz JD; Mandell DM; Faerber EN; Popky GL; Ardito JM; Steinberg SB; Rojer CL 《Radiology》1985,157(2):395-398
Ossification of the membranous labyrinth (labyrinthitis ossificans) develops as the final result of many inflammatory processes, for example, meningitis, blood-borne septic emboli, middle ear infection, and cholesteatoma. Labyrinthine ossification may also occur as a result of previous labyrinthectomy or secondary to trauma. Seven cases of labyrinthine ossification accompanied by severe vertigo and total hearing loss in the affected ear are discussed. The computed tomographic appearance of varying degrees of ossification, the clinical and surgical circumstances from which this disorder may develop, and the various approaches to labyrinthectomy are described. 相似文献
995.
Ninety patients who had suspected or confirmed fenestral or cochlear otosclerosis underwent CT examination. Foci of demineralization in the otic capsule were discovered in 20 ears (12 patients). Audiometric studies of the 12 patients revealed sensorineural hearing loss (SNHL) with distinct correlation of CT findings with progressivity and with involvement of the frequency level subtended by the specific area of the cochlea involved. Foci of abnormal increased density, presumably representing the healed phase of this disorder, were found less frequently than expected. There was a predilection for the basilar turn. All patients had static SNHL in the higher frequencies. The healed phase of this disorder is probably not consistently diagnosable with CT. 相似文献
996.
997.
The number of cases of transfusion-associated acquired immune deficiency syndrome (TA-AIDS) that will be seen over the next few years is difficult to estimate, because of the uncertainty about the number of persons infected with the human immunodeficiency virus (HIV) via blood transfusion and about the duration of the incubation period from HIV infection via transfusion to diagnosis of AIDS. Presented here are a mathematical model and nonparametric and parametric statistical analyses of recent data on TA-AIDS that indicate clearly the existing estimability problems. The methods provide short-term projections of new TA-AIDS cases to be reported; the results suggest about 1100 new cases to be reported in the United States between July 1988 and June 1989 and about 1500 more between July 1989 and June 1990. Estimates of the number of eventual TA-AIDS cases to be seen are considerably more uncertain and require additional assumptions about the incubation distribution. Under the assumption that the probability of an infected person developing AIDS within 8 years of infection is 0.40 (an estimation derived from cohort studies in homosexual men and hemophiliacs), parametric and nonparametric analyses give, respectively, point estimates of 14,300 and 15,000 for the number of eventual cases of AIDS (in the age group 13-69) attributable to infection by blood transfusion prior to July 1985. The parametric analysis gives a corresponding 95 percent confidence interval. 相似文献
998.
999.
The epiphyseal ossification centers of the distal femur (DFE) and proximal tibia (PTE) appear and enlarge during the third trimester of pregnancy. Late in the third trimester, the epiphysis of the proximal humerus (PHE) begins to ossify in some fetuses. Using the amniocentesis lung profile to determine the value of sonographic epiphyseal visualization as a predictor of pulmonary maturity, we studied 50 fetuses prospectively and compared the sonographic epiphyseal findings with results from the amniocentesis lung profiles. Nine fetuses with a visible PHE had a mature amniocentesis lung profile (accuracy of positive prediction = 100%), and then fetuses with an immature amniocentesis lung profile had no visible PHE (conegativity = 100%). Fetuses in which the combined DFE and PTE diameters were greater than 11 mm or in which the DFE and the PTE diameters were similar in size (DFE less than or equal to 1 mm larger than PTE) also yielded positive results. Copositivity and accuracy of prediction of an immature amniocentesis lung profile, on the other hand, were low (22%-25%) for the same epiphyseal parameters. These data suggest that antenatal visualization and measurement of the epiphyseal ossification centers of the fetal knee and shoulder may help to identify fetuses that would have a mature amniocentesis lung profile. 相似文献
1000.
Virtual scopy is a computerized, non-invasive technique used in simulating views provided by a fiber optic endoscope. Multidetector CT (MDCT) enhances the technique of Virtual scopy, by its z-axis resolution, faster data acquisition and improved 3D-image quality. The common application included Virtual Colonoscopy, Bronchoscopy, Gastroscopy, Angioscopy, Labyrinthoscopy, Thoracoscopy and Stentoscopy. Of the 45 Virtual scopies referred to Radiology Department at INHS Asvini, the single largest application was Virtual Angioscopy followed by Stentoscopy and the smallest was evaluation of larynx, labyrinth, colon and mediastinum accounting for 3 each. Endoscopy data and histopathological diagnosis was available in 17 patients, who underwent Virtual studies of larynx, airway, stomach, mediastinum and colon.Key Word: Virtual Endoscopy, Virtual scopy, Internal Volume Rendering 相似文献