全文获取类型
收费全文 | 6601篇 |
免费 | 482篇 |
国内免费 | 25篇 |
专业分类
耳鼻咽喉 | 83篇 |
儿科学 | 182篇 |
妇产科学 | 106篇 |
基础医学 | 1154篇 |
口腔科学 | 270篇 |
临床医学 | 644篇 |
内科学 | 1192篇 |
皮肤病学 | 123篇 |
神经病学 | 719篇 |
特种医学 | 224篇 |
外科学 | 875篇 |
综合类 | 47篇 |
一般理论 | 1篇 |
预防医学 | 614篇 |
眼科学 | 79篇 |
药学 | 517篇 |
中国医学 | 26篇 |
肿瘤学 | 252篇 |
出版年
2023年 | 64篇 |
2022年 | 125篇 |
2021年 | 181篇 |
2020年 | 129篇 |
2019年 | 181篇 |
2018年 | 197篇 |
2017年 | 145篇 |
2016年 | 177篇 |
2015年 | 212篇 |
2014年 | 267篇 |
2013年 | 304篇 |
2012年 | 449篇 |
2011年 | 486篇 |
2010年 | 278篇 |
2009年 | 237篇 |
2008年 | 324篇 |
2007年 | 307篇 |
2006年 | 274篇 |
2005年 | 219篇 |
2004年 | 185篇 |
2003年 | 211篇 |
2002年 | 196篇 |
2001年 | 111篇 |
2000年 | 136篇 |
1999年 | 124篇 |
1998年 | 43篇 |
1997年 | 50篇 |
1996年 | 43篇 |
1995年 | 35篇 |
1994年 | 37篇 |
1993年 | 24篇 |
1992年 | 74篇 |
1991年 | 67篇 |
1990年 | 60篇 |
1989年 | 61篇 |
1988年 | 66篇 |
1987年 | 71篇 |
1986年 | 66篇 |
1985年 | 61篇 |
1984年 | 42篇 |
1983年 | 37篇 |
1982年 | 33篇 |
1981年 | 28篇 |
1979年 | 32篇 |
1977年 | 27篇 |
1976年 | 25篇 |
1974年 | 26篇 |
1973年 | 33篇 |
1972年 | 28篇 |
1970年 | 25篇 |
排序方式: 共有7108条查询结果,搜索用时 15 毫秒
21.
We report the cases of five patients with lesions of benign reactive hyperplasia of the skin in the hip joint region. In view of the distinct clinical features, and in analogy with previously reported cases of acanthoma fissuratum, we termed this condition acanthoma supratrochantericum. 相似文献
22.
Transmission computed tomography (TCT) data provides useful complementary information to single-photon emission computed tomography (SPECT) reconstructions, especially for cardiac studies. In particular, TCT data has been used to correct for nonuniform attenuation in the chest. Typically the transmission data are acquired in a separate acquisition, but simultaneous acquisition is preferable both to save time and to avoid difficulties involved with registration. In this work, we present a technique for simultaneously acquiring 201Tl SPECT and TCT data using a 99mTc sheet source that requires only minor equipment modifications. The use of these isotopes results in cross-contamination of the emission and transmission data. We present a practical technique to compensate for this contamination using post-acquisition image processing. This technique was evaluated by performing phantom and patient studies. The resulting images compare well with data obtained from separate emission and transmission studies. 相似文献
23.
Stefan Farese Kushiar Shojaati Bert Kadereit Felix J Frey Markus G Mohaupt 《Nephrology, dialysis, transplantation》2006,21(7):1984-1987
Volume expansion in the presence of elevated aldosterone availabilityis a hallmark of normal pregnancy. Intravascular volume depletioncharacterizes severe pregnancy-associated disease conditionssuch as intra-uterine growth retardation, chronic hypertensionor pre-eclampsia [1]. Two hypotheses have been forwarded toexplain volume depletion in pregnancy: the first hypothesischarges inappropriate sensing of vascular overfilling,resulting in an increased transendothelial loss of fluid tothe extravascular compartment. In contrast, the second hypothesisfocuses on vascular underfilling due to inappropriatelylow aldosterone levels. The second hypothesis is based on theassumption that a compensatory increase in the circulating fluidvolume is required in normal pregnancy to support fetal substratedelivery. According to the second concept, maternal blood pressureincreases due to counter-regulatory mechanisms when placentalblood supply is reduced [2]. In support of the underfillinghypothesis are observations that a 相似文献
24.
25.
26.
Marcelo Miranda MD Claudia Castiglioni MD Beat M. Frey MD Martin Hergersberg PhD Adrian Danek MD Hans H. Jung MD 《Movement disorders》2007,22(9):1358-1361
The X‐linked McLeod neuroacanthocytosis syndrome strongly resembles Huntington's disease and has been reported in various countries world‐wide. Herein, we report two Chilean brothers with predominant psychiatric features at disease onset including schizophrenia‐like psychosis and obsessive compulsive disorder. Molecular genetic analysis revealed a small deletion in the XK gene (938‐942delCTCTA), which has been already described in a North American patient of Anglo‐Saxon descent and a Japanese family, presenting with seizures, muscle atrophy or chorea yet absence of psychiatric features. These findings argue against a founder effect and indicate a profound phenotypic variability associated with the 938‐942delCTCTA deletion. Our report supports the inclusion of McLeod syndrome in the differential diagnosis of Huntington's disease as well as acute psychosis in male subjects. © 2007 Movement Disorder Society 相似文献
27.
28.
Claus Neurohr Patrick Huppmann Hanno Leuchte Martin Schwaiblmair Iris Bittmann Gundula Jaeger Rudolf Hatz Lorenz Frey Peter Überfuhr Bruno Reichart Jürgen Behr for the Munich Lung Transplant Group 《American journal of transplantation》2005,5(12):2982-2991
Bronchiolitis obliterans syndrome (BOS) is the limiting factor to long-term survival after lung transplantation. Previous studies suggested respiratory viral tract infections are associated with the development of BOS. To identify the impact of virus detection in bronchoalveolar lavage (BAL) fluid, we analyzed BAL samples from 87 consecutive lung transplant recipients for human herpesvirus (HHV)-6, Epstein-Barr virus, Herpes simplex virus 1/2, Cytomegalovirus, respiratory syncytical virus and adenovirus by PCR. Acute rejection, BOS and death were recorded for a mean follow-up time of 3.27 +/- 0.47 years. Results of PCR analysis and other potential risk factors were entered into a Cox regression analysis of BOS predictors and death. Only acute rejection was a distinct risk factor for BOS of all stages, death and death from BOS. HHV-6 was detected in 20 patients. Univariate and multivariate analysis revealed that HHV-6 was associated with an increased risk to develop BOS > orb = stage 1 and death, separate from the risk attributable to acute rejection. Identification of HHV-6 DNA in BAL fluid is a potential risk factor for BOS. Our results warrant further studies to elucidate a possible causal link between HHV-6 and BOS. 相似文献
29.
30.
2-Amino-3-cyano-dihydroindol-5-ones 2 and 3 are formed by reaction of 2-Aminopyrrole-3-carbonitriles 1 with acetylenic acid esters. In various biological test systems they behave as cytotoxic agents. 相似文献