全文获取类型
收费全文 | 186678篇 |
免费 | 13668篇 |
国内免费 | 4341篇 |
专业分类
耳鼻咽喉 | 1369篇 |
儿科学 | 2913篇 |
妇产科学 | 3111篇 |
基础医学 | 24113篇 |
口腔科学 | 3584篇 |
临床医学 | 12635篇 |
内科学 | 24167篇 |
皮肤病学 | 2262篇 |
神经病学 | 12448篇 |
特种医学 | 6484篇 |
外国民族医学 | 1篇 |
外科学 | 14803篇 |
综合类 | 24358篇 |
现状与发展 | 22篇 |
一般理论 | 8篇 |
预防医学 | 18061篇 |
眼科学 | 2279篇 |
药学 | 25752篇 |
58篇 | |
中国医学 | 12766篇 |
肿瘤学 | 13493篇 |
出版年
2024年 | 302篇 |
2023年 | 2352篇 |
2022年 | 4693篇 |
2021年 | 8426篇 |
2020年 | 6458篇 |
2019年 | 6373篇 |
2018年 | 6389篇 |
2017年 | 6989篇 |
2016年 | 7034篇 |
2015年 | 6647篇 |
2014年 | 7483篇 |
2013年 | 11684篇 |
2012年 | 9207篇 |
2011年 | 11070篇 |
2010年 | 6980篇 |
2009年 | 7061篇 |
2008年 | 8630篇 |
2007年 | 9589篇 |
2006年 | 9064篇 |
2005年 | 8400篇 |
2004年 | 7210篇 |
2003年 | 6483篇 |
2002年 | 5122篇 |
2001年 | 4578篇 |
2000年 | 3867篇 |
1999年 | 3283篇 |
1998年 | 2576篇 |
1997年 | 2687篇 |
1996年 | 2450篇 |
1995年 | 2126篇 |
1994年 | 2059篇 |
1993年 | 1738篇 |
1992年 | 1615篇 |
1991年 | 1510篇 |
1990年 | 1302篇 |
1989年 | 1065篇 |
1988年 | 1030篇 |
1987年 | 934篇 |
1986年 | 868篇 |
1985年 | 1254篇 |
1984年 | 1003篇 |
1983年 | 758篇 |
1982年 | 781篇 |
1981年 | 645篇 |
1980年 | 628篇 |
1979年 | 492篇 |
1978年 | 319篇 |
1977年 | 270篇 |
1976年 | 250篇 |
1975年 | 193篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
111.
112.
113.
114.
《Clinical Lymphoma, Myeloma & Leukemia》2020,20(8):e461-e467
IntroductionVon Willebrand factor (vWF) cleaving protease ADAMTS-13 has a key role for maintaining normal size of vWF. A deficiency or dysfunction of vWF cleaving protease is associated with ultra large vWF multimers and thrombotic microangiopathy. Patients with cancers have reduced levels of vWF cleaving protease. In this pilot study, we have evaluated whether or not deficiencies of ADAMTS-13 were present in myelodysplastic syndromes (MDS). Moreover, we assessed if a reduction in basal levels of ADAMTS-13 may play a role in the prognosis of MDS.Patients and MethodsWe measured and compared the levels of vWF cleaving protease ADAMTS-13 in 100 patients with MDS and 35 healthy controls. Patients were divided into 2 groups according to the International Prognostic Scoring System: group I consisting of 44 patients with low-risk MDS and group II of 56 patients with high-risk MDS. Patients with high-risk and low-risk MDS presented significantly lower levels of ADAMTS-13 than controls (P < .001 and P = .0177, respectively). High-risk patients had significantly lower levels of ADAMTS-13 when compared with the low-risk group (P < .001).ResultsWe found that reduced levels of ADAMTS-13 have a relationship with overall survival (P < .001). Statistical analysis showed that ADAMTS-13 correlates with cytogenetics (P < .001) and a tendency of slight correlation with platelet count and basal levels of ADAMTS-13 (R, 0.35; P value, 0.001). Moreover, we found that levels of ADAMTS-13 have correlation with response to treatment (P < .001).ConclusionsADAMTS-13 in MDS might represent a surrogate marker of prognosis, response to therapy, or disease progression. Further studies are needed. 相似文献
115.
《Cancer cell》2020,37(1):123-134.e5
116.
《Clinical oncology (Royal College of Radiologists (Great Britain))》2020,32(6):347-353
The current COVID-19 pandemic presents a substantial obstacle to cancer patient care. Data from China as well as risk models suppose that cancer patients, particularly those on active, immunosuppressive therapies are at higher risks of severe infection from the illness. In addition, staff illness and restructuring of services to deal with the crisis will inevitably place treatment capacities under significant strain. These guidelines aim to expand on those provided by NHS England regarding cancer care during the coronavirus pandemic by examining the known literature and provide guidance in managing patients with urothelial and rarer urinary tract cancers. In particular, they address the estimated risk and benefits of standard treatments and consider the alternatives in the current situation. As a result, it is recommended that this guidance will help form a framework for shared decision making with patients. Moreover, they do not advise a one-size-fits-all approach but recommend continual assessment of the situation with discussion within and between centres. 相似文献
117.
Altan Ahmed John A. Stauffer Jordan D. LeGout Justin Burns Kristopher Croome Ricardo Paz-Fumagalli Gregory Frey Beau Toskich 《Journal of gastrointestinal oncology.》2021,12(2):751
BackgroundNeoadjuvant yttrium-90 transarterial radioembolization (TARE) is increasingly being used as a strategy to facilitate resection of otherwise unresectable tumors due to its ability to generate both tumor response and remnant liver hypertrophy. Perioperative outcomes after the use of neoadjuvant lobar TARE remain underinvestigated.MethodsA single center retrospective review of patients who underwent lobar TARE prior to major hepatectomy for primary or metastatic liver cancer between 2007 and 2018 was conducted. Baseline demographics, radioembolization parameters, pre- and post-radioembolization volumetrics, intra-operative surgical data, adverse events, and post-operative outcomes were analyzed.ResultsTwenty-six patients underwent major hepatectomy after neoadjuvant lobar TARE. The mean age was 58.3 years (17–88 years). 62% of patients (n=16) had primary liver malignancies while the remainder had metastatic disease. Liver resection included right hepatectomy or trisegmentectomy, left or extended left hepatectomy, and sectorectomy/segmentectomy in 77% (n=20), 8% (n=2), and 15% (n=4) of patients, respectively. The mean length of stay was 8.3 days (range, 3–33 days) and there were no grade IV morbidities or 90-day mortalities. The incidence of post hepatectomy liver failure (PHLF) was 3.8% (n=1). The median time to progression after resection was 4.5 months (range, 3.3–10 months). Twenty-three percent (n=6) of patients had no recurrence. The median survival was 28.9 months (range, 16.9–46.8 months) from major hepatectomy and 37.6 months (range, 25.2–53.1 months) from TARE.ConclusionsMajor hepatectomy after neoadjuvant lobar radioembolization is safe with a low incidence of PHLF. 相似文献
118.
《Biomaterials》2015
Mesoporous silica nanoparticles (MSNs) can provide a structural foundation for a new generation of nanocarriers with a broad range of functionalities. Multifunctional MSNs can serve as all-in-one diagnostic and therapeutic tools that can be used to simultaneously visualize and treat various diseases, such as cancer. This research study is the first time that two lanthanide-based imaging systems have been combined to incorporate controlled drug release and targeted tracing into a single MSN-based nano-platform for a novel theranostic drug delivery system. Doping lanthanide ions, i.e., europium (Eu) and gadolinium (Gd) ions, into an MSN structure (EuGd-MSNs) imparts fluorescence and magnetism to the nanostructure that can be used to develop magnetic resonance imaging (MRI) and biological fluorescence tools. Current cancer research has revealed that most human cancer cells express a large number of folate receptors on their surface. Grafting folic acid (FA) onto the EuGd-MSN surface (EuGd-FA-MSNs) imparts a targeting function to the MSN because of the specificity of the binding of FA to cell surface receptors. Furthermore, grafting anticancer drugs, such as camptothecin (CPT), onto the surface of these MSNs by forming disulfide bonds (EuGd-SS-CPT-FA-MSNs) enables intracellular controlled drug release. A high concentration of intracellular glutathione cleaves the disulfide bond to release the drug and treat the disease. The results of in vitro and in vivo studies show that the functionalized MSNs can be successfully used as a platform to integrate dual-imaging, targeting, and therapeutic treatment in multifunctional diagnosis drug delivery systems. 相似文献
119.
120.
Lesley A. Inker Morgan E. Grams Andrew S. Levey Josef Coresh Massimo Cirillo John F. Collins Ron T. Gansevoort Orlando M. Gutierrez Takayuki Hamano Gunnar H. Heine Shizukiyo Ishikawa Sun Ha Jee Florian Kronenberg Martin J. Landray Katsuyuki Miura Girish N. Nadkarni Carmen A. Peralta Dietrich Rothenbacher Mark Woodward 《American journal of kidney diseases》2019,73(2):206-217