全文获取类型
收费全文 | 6568篇 |
免费 | 650篇 |
国内免费 | 24篇 |
专业分类
耳鼻咽喉 | 67篇 |
儿科学 | 211篇 |
妇产科学 | 102篇 |
基础医学 | 1000篇 |
口腔科学 | 121篇 |
临床医学 | 781篇 |
内科学 | 1308篇 |
皮肤病学 | 80篇 |
神经病学 | 574篇 |
特种医学 | 264篇 |
外国民族医学 | 1篇 |
外科学 | 674篇 |
综合类 | 159篇 |
一般理论 | 2篇 |
预防医学 | 715篇 |
眼科学 | 115篇 |
药学 | 616篇 |
中国医学 | 9篇 |
肿瘤学 | 443篇 |
出版年
2022年 | 46篇 |
2021年 | 93篇 |
2020年 | 65篇 |
2019年 | 80篇 |
2018年 | 91篇 |
2017年 | 97篇 |
2016年 | 98篇 |
2015年 | 137篇 |
2014年 | 157篇 |
2013年 | 238篇 |
2012年 | 322篇 |
2011年 | 359篇 |
2010年 | 203篇 |
2009年 | 204篇 |
2008年 | 351篇 |
2007年 | 315篇 |
2006年 | 348篇 |
2005年 | 309篇 |
2004年 | 300篇 |
2003年 | 250篇 |
2002年 | 210篇 |
2001年 | 224篇 |
2000年 | 220篇 |
1999年 | 181篇 |
1998年 | 87篇 |
1997年 | 84篇 |
1996年 | 65篇 |
1995年 | 84篇 |
1994年 | 57篇 |
1993年 | 56篇 |
1992年 | 128篇 |
1991年 | 141篇 |
1990年 | 120篇 |
1989年 | 125篇 |
1988年 | 102篇 |
1987年 | 123篇 |
1986年 | 106篇 |
1985年 | 121篇 |
1984年 | 82篇 |
1983年 | 59篇 |
1982年 | 49篇 |
1981年 | 58篇 |
1980年 | 46篇 |
1979年 | 64篇 |
1978年 | 49篇 |
1977年 | 45篇 |
1976年 | 47篇 |
1975年 | 58篇 |
1974年 | 43篇 |
1973年 | 45篇 |
排序方式: 共有7242条查询结果,搜索用时 0 毫秒
21.
22.
Factors affecting conjugative transfer of plasmid pWG613, determining gentamicin resistance, in Staphylococcus aureus 总被引:2,自引:0,他引:2
Factors that are known to influence plasmid transfer in bacterial populations were studied for the conjugative plasmid pWG613, which determined gentamicin resistance in Staphylococcus aureus. The transfer frequency was largely unaffected over a wide range of temperature (18-42 degrees C); pH also had little effect on the transfer frequency in the range 5.0-8.5. High cell density and log phase cultures were required for optimal plasmid transfer, as were donor:recipient ratios of 0.003-3.3. 相似文献
23.
Yu X Kong Gavin Wright Konrad Pesudovs Justin ODay Zoe Wainer Harrison S Weisinger 《Clinical & experimental optometry》2007,90(5):336-344
Horner syndrome is an uncommon but important clinical entity, representing interruption of the sympathetic pathway to the eye and face. Horner syndrome is almost always diagnosed clinically, though pharmacological testing can be used to confirm the diagnosis. Imaging modalities such as PET, CT and MRI are important components of work‐up for patients presenting with acquired Horner syndrome. Our patient’s presentation with Horner syndrome unmasked the causative superior sulcus squamous cell carcinoma and a coincidental lower lobe adenocarcinoma. Successful radical treatment of these cancers resulted in complete resolution of the syndrome and disease‐free survival at 18 months. We review the anatomy and pathophysiology underlying this and other causes of Horner syndrome. 相似文献
24.
25.
Innate immunity and its role against infections. 总被引:5,自引:0,他引:5
Suwannee Uthaisangsook Noorbibi K Day Sami L Bahna Robert A Good Soichi Haraguchi 《Annals of allergy, asthma & immunology》2002,88(3):253-64; quiz 265-6, 318
LEARNING OBJECTIVES: This article reviews current concepts of the innate immune system that offers protection against infections. It offers an overview for the readers to understand how innate immunity, consisting of different receptors, cells, and mediators recognizes pathogens and exerts protective function against pathogens. DATA SOURCES AND STUDY SELECTION: MEDLINE-search articles including original research papers, review articles, textbooks, and references identified from bibliographies of relevant articles. RESULTS AND CONCLUSIONS: The innate immune system is nonspecific immunity present since birth not requiring repeated exposure to pathogens. It is capable of differentiation between self and nonself. Because of its nonspecificity, it has a broad spectrum of resistance to infection. Further, it is thought to play an important role in the control of adaptive immunity by regulating co-stimulatory molecules and effector cytokines. Innate immunity includes pattern recognition molecules/receptors, antimicrobial peptides, the complement system, inflammatory mediators, and cytokines produced by immune cells. Pattern recognition molecules/receptors recognize pathogen-associated molecular patterns that are essential for microorganisms' survival and pathogenicity. Although innate immunity has recently gained increasing importance, further studies are necessary for a better understanding of its role. 相似文献
26.
27.
Imaging of renal transplants 总被引:1,自引:0,他引:1
J G Letourneau D L Day N L Ascher W R Castaneda-Zuniga 《AJR. American journal of roentgenology》1988,150(4):833-838
28.
G C Toms J Fairbank S L Day M Fisher T Beedham J P Monson 《Diabetes research and clinical practice》1992,18(1):55-60
The characteristics and outcome of pregnancy complicated by gestational glucose intolerance are described in a consecutive series of 69 Bengali Asian patients and a parallel group of 22 Caucasian patients. The Bengali patients were older and of higher parity than the Caucasians and more frequently required insulin therapy. However, the outcome of pregnancy was similar in terms of antenatal clinic attendance, the number of antenatal hospital admissions, glycaemic control, birthweight and mode of delivery. Of those patients who attended for postnatal glucose tolerance test, 20% of the Bengali population demonstrated persisting abnormality of glucose tolerance, whereas no abnormalities were evident in the Caucasian group. These findings are consistent with the high prevalence and early age of onset of non-insulin-dependent diabetes in Asian populations. The World Health Organisation (WHO) criteria for the diagnosis of impaired glucose tolerance proved insufficiently sensitive for the diagnosis of gestational diabetes. This was particularly demonstrated by four patients with apparently normal glucose tolerance by WHO criteria who subsequently required insulin therapy. 相似文献
29.
30.
Stimulation of the human motor cortex through the scalp 总被引:24,自引:0,他引:24