全文获取类型
收费全文 | 20213篇 |
免费 | 1390篇 |
国内免费 | 38篇 |
专业分类
耳鼻咽喉 | 123篇 |
儿科学 | 599篇 |
妇产科学 | 441篇 |
基础医学 | 2430篇 |
口腔科学 | 459篇 |
临床医学 | 3199篇 |
内科学 | 3281篇 |
皮肤病学 | 208篇 |
神经病学 | 1932篇 |
特种医学 | 541篇 |
外科学 | 2025篇 |
综合类 | 719篇 |
一般理论 | 36篇 |
预防医学 | 2430篇 |
眼科学 | 438篇 |
药学 | 1449篇 |
2篇 | |
中国医学 | 10篇 |
肿瘤学 | 1319篇 |
出版年
2023年 | 100篇 |
2022年 | 188篇 |
2021年 | 375篇 |
2020年 | 232篇 |
2019年 | 362篇 |
2018年 | 457篇 |
2017年 | 331篇 |
2016年 | 361篇 |
2015年 | 394篇 |
2014年 | 538篇 |
2013年 | 914篇 |
2012年 | 1349篇 |
2011年 | 1551篇 |
2010年 | 809篇 |
2009年 | 755篇 |
2008年 | 1361篇 |
2007年 | 1450篇 |
2006年 | 1450篇 |
2005年 | 1437篇 |
2004年 | 1469篇 |
2003年 | 1407篇 |
2002年 | 1232篇 |
2001年 | 257篇 |
2000年 | 174篇 |
1999年 | 202篇 |
1998年 | 249篇 |
1997年 | 184篇 |
1996年 | 137篇 |
1995年 | 145篇 |
1994年 | 111篇 |
1993年 | 123篇 |
1992年 | 124篇 |
1991年 | 89篇 |
1990年 | 97篇 |
1989年 | 81篇 |
1988年 | 72篇 |
1987年 | 73篇 |
1986年 | 95篇 |
1985年 | 72篇 |
1984年 | 78篇 |
1983年 | 78篇 |
1982年 | 61篇 |
1981年 | 66篇 |
1980年 | 78篇 |
1979年 | 45篇 |
1978年 | 50篇 |
1977年 | 38篇 |
1976年 | 34篇 |
1975年 | 34篇 |
1973年 | 38篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
11.
Pradip K. Rustagi Tin Han Lynn Ziolkowski Deborah L. Farolino Mark S. Currie Gerald L. Logue 《British journal of haematology》1987,66(4):461-465
The anti-granulocyte activity of serum from patients with B-cell chronic lymphocytic leukaemia (CLL) and other lymphoproliferative disorders was investigated. Granulocyte-binding IgG was measured in 34 patients with CLL, 13 patients with hairy cell leukaemia, one patient with prolymphocytic leukaemia, two patients with Sézary cell leukaemia, and seven patients with chronic T-cell lymphocytosis who had a predominance of circulating large granular lymphocytes. Anti-granulocyte activity was absent in CLL and its variants, but present in the majority of granulocytopenic patients with chronic T-cell lymphocytosis. In one of these patients, granulocytopenia was associated with complement-activating IgG granulocyte antibody. Thus, antibody-mediated granulocyte injury appears to be an unusual occurrence in chronic lymphocytic leukaemia, but is a frequent complication of chronic T-cell lymphocytosis. 相似文献
12.
M. Laurin Council Jennifer M. Gardner Cynthia Helms Ying Liu Lynn A. Cornelius Anne M. Bowcock 《Experimental dermatology》2009,18(5):485-487
Abstract: The risks of developing malignant melanoma (MM) include ultraviolet irradiation and genetic factors. To examine the contribution of rare and common variation within known MM genes in sporadic US MM patients, coding regions of known MM susceptibility genes [cyclin-dependent kinase inhibitor 2A ( CDKN2A ), cyclin-dependent kinase 4, melanocortin 1 receptor ( MC1R ) and tyrosinase ( TYR )] were resequenced in 109–135 MM cases. The significance of variants was examined by comparing their frequencies in 390 cancer-free controls. Potential deleterious mutations in CDKN2A were found in two patients and two others had variants of unknown significance. Cases were more likely than controls to harbour the MC1R 'R' variants known or predicted to alter its function ( P = 0.002), particularly the R160W variant ( P = 0.0035). The associated TYR R402Q variant (rs1126809*A) was found in 29% of cases, similar to what has been described previously. One MM patient with a family history of MM, who had developed other skin cancers, was homozygous for a novel TYR variant (P406L) of unknown significance. Hence, rare variants in TYR may be important risk factors for skin cancer. 相似文献
13.
Charles Opondo Stephen Ntoburi John Wagai Jackline Wafula Aggrey Wasunna Fred Were Annah Wamae Santau Migiro Grace Irimu Mike English 《Tropical medicine & international health : TM & IH》2009,14(10):1165-1172
Objective To assess the availability of resources that support the provision of basic neonatal care in eight first‐referral level (district) hospitals in Kenya. Methods We selected two hospitals each from four of Kenya’s eight provinces with the aim of representing the diversity of this part of the health system in Kenya. We created a checklist of 53 indicator items necessary for providing essential basic care to newborns and assessed their availability at each of the eight hospitals by direct observation, and then compared our observations with the opinions of health workers providing care to newborns on recent availability for some items, using a self‐administered structured questionnaire. Results The hospitals surveyed were often unable to maintain a safe hygienic environment for patients and health care workers; staffing was insufficient and sometimes poorly organised to support the provision of care; some key equipment, laboratory tests, drugs and consumables were not available while patient management guidelines were missing in all sites. Conclusion Hospitals appear relatively poorly prepared to fill their proposed role in ensuring newborn survival. More effective interventions are needed to improve them to meet the special needs of this at‐risk group. 相似文献
14.
15.
D J Lynn 《American journal of psychotherapy》1989,43(1):108-117
A peculiarly effective intervention by the author's psychoanalyst is explored and discussed in terms of its implicitly expressive properties. It is placed in the context of the classical concept of opacity and more flexible Sullivanian ideas, as expanded and clarified by Havens. 相似文献
16.
17.
18.
Popliteal artery aneurysms representing 80% of peripheral artery aneurysms rarely rupture (a reported incidence of 0.1–2.8
%) and second commonest in frequency after aorto-iliac aneurysms. They usually present with pain, swelling, occlusion or distal
embolisation and can cause diagnostic difficulties. We report a 78 year old man who was previously admitted to hospital with
a pulmonary embolus secondary to deep venous thrombosis. He was heparinized then warfarinised and was readmitted with a ruptured
popliteal aneurysm leading to a large pseudo aneurysm formation. The pulmonary embolus had been due to popliteal vein thrombosis
and propagation of the clot. A thorough review of literature identified only one previously reported case of ruptured popliteal
artery aneurysm and subsequent large pseudo aneurysm formation. We feel it is important to exclude a popliteal aneurysm in
a patient with DVT. This may be more common than the published literature suggests. 相似文献
19.
20.