全文获取类型
收费全文 | 99494篇 |
免费 | 4634篇 |
国内免费 | 463篇 |
专业分类
耳鼻咽喉 | 1287篇 |
儿科学 | 2605篇 |
妇产科学 | 2316篇 |
基础医学 | 13010篇 |
口腔科学 | 3484篇 |
临床医学 | 7186篇 |
内科学 | 24652篇 |
皮肤病学 | 2052篇 |
神经病学 | 8491篇 |
特种医学 | 2922篇 |
外国民族医学 | 6篇 |
外科学 | 12314篇 |
综合类 | 694篇 |
一般理论 | 34篇 |
预防医学 | 9928篇 |
眼科学 | 1813篇 |
药学 | 6462篇 |
1篇 | |
中国医学 | 421篇 |
肿瘤学 | 4913篇 |
出版年
2023年 | 680篇 |
2022年 | 1372篇 |
2021年 | 2867篇 |
2020年 | 1488篇 |
2019年 | 2449篇 |
2018年 | 4594篇 |
2017年 | 2811篇 |
2016年 | 2236篇 |
2015年 | 2444篇 |
2014年 | 3288篇 |
2013年 | 4343篇 |
2012年 | 6749篇 |
2011年 | 7191篇 |
2010年 | 3887篇 |
2009年 | 3379篇 |
2008年 | 5841篇 |
2007年 | 5975篇 |
2006年 | 5558篇 |
2005年 | 5490篇 |
2004年 | 4956篇 |
2003年 | 4638篇 |
2002年 | 4274篇 |
2001年 | 2123篇 |
2000年 | 2227篇 |
1999年 | 1842篇 |
1998年 | 757篇 |
1997年 | 535篇 |
1996年 | 485篇 |
1995年 | 419篇 |
1994年 | 357篇 |
1993年 | 343篇 |
1992年 | 915篇 |
1991年 | 748篇 |
1990年 | 702篇 |
1989年 | 583篇 |
1988年 | 520篇 |
1987年 | 528篇 |
1986年 | 477篇 |
1985年 | 416篇 |
1984年 | 313篇 |
1983年 | 256篇 |
1982年 | 182篇 |
1979年 | 220篇 |
1978年 | 197篇 |
1977年 | 166篇 |
1975年 | 187篇 |
1974年 | 207篇 |
1973年 | 187篇 |
1972年 | 179篇 |
1971年 | 176篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
Heloísio de Rezende Leite Guilherme Silvério de Oliveira Hélio Henrique de Araújo Brito 《American journal of orthodontics and dentofacial orthopedics》2005,128(2):241-251
This case report demonstrates how extracting a maxillary deciduous canine affects the eruption path of a labially displaced ectopically erupting permanent canine. A long-term follow-up is presented, and the biologic mechanisms are discussed. 相似文献
62.
63.
Alberto Castilla M.D. Joan Camps-Bansell M.D. Maria-Pilar Civeira M.D. Jesús Prieto M.D. 《The American journal of gastroenterology》1993,88(2):233-239
Forty patients with chronic hepatitis C (CHC) were included in an open randomized controlled trial of lymphoblastoid α-interferon (L-IFN) versus no treatment. Twenty patients entered each group, and features of therapy and control cases were similar. L-IFN was given in low doses (1.5-4.5 megaunits) for 1 yr. In 16 of 20 patients treated with L-IFN (80%), but in only one of 20 nontreated cases (0.5%; p < 0.001), aminotransferase activities became normal. In four patients there was a reactivation of the disease during treatment after 4, 5, 6, and 8 months with normal aminotransferase levels. A posttherapy reactivation of hepatitis was observed in four additional cases after 1, 1, 1, and 3 months of follow-up. The other eight patients (40%) continued with normal aminotransferase levels for 1.52 ± 0.74 (range, 1-2.1) yr after IFN doses were discontinued. In all treated patients except two nonresponders, but in only one of 20 nontreated cases ( p < 0.001), Knodell's histological activity index decreased. Procollagen type III aminoterminal peptide levels did not change significantly in nontreated and nonresponder patients, diminished slightly in patients with a transient response, and normalized in cases with a long-standing response, suggesting that this serum test may be a reliable marker for monitoring response to IFIN therapy in patients with CHC. Finally, L-IFN treatment induced significant increments in CD4/CD8 index, phytohemagglutinin-induced blastogenesis, and natural killer activity. This study shows that L-IFN diminish inflammatory and fibrogenic activity in most patients with CHC. In 40% of patients treated in this trial, a long-standing remission of the disease was observed. 相似文献
64.
J Canet J Vallés P Vila F Vidal 《Revista espa?ola de anestesiología y reanimación》1990,37(6):366-369
Patients with morbid obesity present a series of functional and morphologic alterations and require a careful planning for anesthetic management. We report a case of a woman weighing 260 kg who was operated on twice for the treatment of her base condition. In the first operation, general anesthesia was carried out and in the second one, epidural anesthesia was conducted. Main complications included hypoxemia and hypercapnia which persisted during the first week after operation carried out under general anesthesia. 相似文献
65.
Juan J. Muoz Cristina Roca Jos L. Santos Miguel Arroyo Rafael E. de Salamanca 《Basic & clinical pharmacology & toxicology》1993,73(4):189-191
Two alternatives for the treatment of lead intoxication, administration of zinc or a thiol donor, S-adenosyl-L-methionine (SAM), were analysed. Rats were exposed to lead (Pb)-acetate (60 mg/1) in drinking water during 90 days; one group also received SO4Zn in water (40 mg/l), while another received both Pb and SAM (5 mg/24 hr intraperitoneally. Erythrocytic δ-aminolaevulinic dehydratase (ALA-D) activity was significantly reduced (P<0.001) both in rats receiving Pb alone and in rats receiving Pb and each of the other two treatments. The high erythrocytic uroporphyrinogen synthetase (URO-S) activity noticed in Pb administered rats, was significantly (P< 0.001) reduced in animals treated either with zinc or with SAM. Hepatic ALA-D activity tended to decrease while renal enzyme activity was not modified by the low level Pb exposure used in this work. Interestingly, SAM treated rats in both tissues exhibited significantly (P<0.01) higher activities of the enzyme. It is argued that SAM treatment causes a surplus of thiols that allows the full expression of ALA-D catalytic activity. 相似文献
66.
Dr. J. Tajti MD PhD ; Dr. K. Sas MD ; Dr. D. Szok MD ; Dr. E. Vörös MD ; Dr. L. Vécsei MD DSc 《Headache》1996,36(4):259-260
We report on a patient with clusterlike headache and multiple brain metastases of lung cancer. Initially, cluster headache was suggested clinically by characteristic symptoms without any focal central nervous system signs. However, magnetic resonance imaging demonstrated multiple brain metastases. It is possible that tumor necrosis factor may have played a role in initiating the clusterlike headache. 相似文献
67.
68.
69.
70.
José Ignacio Bilbao Mercedes Arias Jesús María Longo Pedro Luis Alejandre María Teresa Betés Arlette María Elizalde 《Cardiovascular and interventional radiology》1997,20(2):149-153
Percutaneous embolization of large portosystemic collaterals was performed in three patients following placement of a transjugular
intrahepatic portosystemic shunt in order to improve hepatopetal portal flow. Improved hepatic portal perfusion was achieved
in these cases, thereby theoretically reducing the risk of chronic hepatic encephalopathy. 相似文献