全文获取类型
收费全文 | 6909篇 |
免费 | 467篇 |
国内免费 | 26篇 |
专业分类
耳鼻咽喉 | 147篇 |
儿科学 | 164篇 |
妇产科学 | 100篇 |
基础医学 | 835篇 |
口腔科学 | 121篇 |
临床医学 | 771篇 |
内科学 | 1226篇 |
皮肤病学 | 114篇 |
神经病学 | 558篇 |
特种医学 | 261篇 |
外科学 | 1244篇 |
综合类 | 78篇 |
一般理论 | 13篇 |
预防医学 | 626篇 |
眼科学 | 91篇 |
药学 | 573篇 |
中国医学 | 27篇 |
肿瘤学 | 453篇 |
出版年
2023年 | 71篇 |
2022年 | 104篇 |
2021年 | 229篇 |
2020年 | 117篇 |
2019年 | 206篇 |
2018年 | 212篇 |
2017年 | 174篇 |
2016年 | 174篇 |
2015年 | 208篇 |
2014年 | 290篇 |
2013年 | 360篇 |
2012年 | 533篇 |
2011年 | 500篇 |
2010年 | 329篇 |
2009年 | 276篇 |
2008年 | 464篇 |
2007年 | 456篇 |
2006年 | 451篇 |
2005年 | 390篇 |
2004年 | 344篇 |
2003年 | 317篇 |
2002年 | 289篇 |
2001年 | 58篇 |
2000年 | 48篇 |
1999年 | 36篇 |
1998年 | 42篇 |
1997年 | 42篇 |
1996年 | 44篇 |
1995年 | 35篇 |
1994年 | 27篇 |
1993年 | 37篇 |
1992年 | 29篇 |
1991年 | 17篇 |
1990年 | 29篇 |
1989年 | 32篇 |
1988年 | 25篇 |
1987年 | 15篇 |
1985年 | 21篇 |
1984年 | 24篇 |
1983年 | 20篇 |
1982年 | 34篇 |
1981年 | 19篇 |
1980年 | 14篇 |
1979年 | 15篇 |
1978年 | 17篇 |
1973年 | 18篇 |
1971年 | 12篇 |
1969年 | 13篇 |
1967年 | 13篇 |
1941年 | 12篇 |
排序方式: 共有7402条查询结果,搜索用时 31 毫秒
91.
92.
Li Ping Wong Haridah Alias Nasrin Aghamohammadi I-ching Sam Sazaly AbuBakar 《Journal of community health》2017,42(5):854-864
The aims of this study were to explore the differences in (1) the perception of severity towards ZIKV infection and dengue fever, and (2) mosquito control practices before and after the ZIKV outbreak were declared a Public Health Emergency of International Concern (PHEIC). Data were collected between Feb to May 2016 using a computer-assisted telephone interviewing system. The median scale score for perceived severity of ZIKV was 3 (interquartile range [IQR] 1–5) versus 4 (IQR 3–5) for dengue (P?<?0.001). The scores for mosquito control practices before and after ZIKV was declared a PHEIC were similar, at 4 (IQR 3–5). Multivariate analysis revealed that participants with a higher score for perception of severity of ZIKV were more likely to report greater mosquito control practices after the declaration of the PHEIC (OR 1.822 [95% CI 1.107–2.998]). The emerging ZIKV pandemic requires concerted efforts to enhance mosquito control practices among the Malaysian public. Efforts to improve public mosquito control practices should focus on enhancing the perception of the severity of ZIKV. 相似文献
93.
In this paper, we examine the war of words between those who contend that health care practice, including nursing, should primarily be informed by research (the evidence-based practice movement), and those who argue that there should be no restrictions on the sources of knowledge used by practitioners (the postmodernists). We review the postmodernist interventions of Dave Holmes and his colleagues, observing that the postmodernist style to which they adhere, which includes the use of continental philosophy, metaphors, and acerbic delivery, tends to obscure their substantive arguments. The heated nature of some responses to them has tended to have the same effect. However, the substantive arguments are important. Five main postmodernist charges are identified and discussed. The first argument, that the notion of ‘best evidence’ implies a hierarchical and exclusivist approach to knowledge, is persuasive. However, the contention that this hierarchy is maintained by the combined pressures of capitalism and vested interests within academia and the health services, is less well founded. Nevertheless, postmodernist contentions that the hierarchy embraced by the evidence-based practice movement damages health care because it excludes other forms of evidence that are needed to understand the complexity of care, it marginalizes important aspects of clinical knowledge, and it fails to take account of individuals or their experience, are all seen to be of some merit. However, we do not share the postmodernist conclusion that this adds up to a fascist order. Instead, we characterize evidence-based practice as a necessary but not sufficient component of health care knowledge. 相似文献
94.
95.
Thinzar Min Gareth I. Davies Sam Rice James Chess Jeffrey W. Stephens 《Diabetes & Metabolic Syndrome: Clinical Research & Reviews》2018,12(2):123-127
Aims
Chronic kidney disease (CKD) is common in type 2 diabetes and limits the treatment choices for glycaemic control. Our aim was to examine real-world prescribing for managing hyperglycaemia in the presence of CKD.Methods
The SAIL (Secure Anonymised Information Linkage) databank was used to examine prescribing during the period from the 1st of January to 30th December 2014. CKD was defined as:- none or mild CKD, eGFR ≥60 mL/min/1.73m2; moderate CKD eGFR <60 mL/min/1.73m2; and severe CKD eGFR <30 mL/min/1.73m2 or requiring dialysis.Results
We identified 9585 subjects who received any form of glucose lowering therapy (8363 had no/mild CKD; 1137 moderate CKD; 85 severe CKD). There was a linear association between insulin use and CKD severity with approximately 54% of those with severe CKD receiving insulin. Sulphonylureas use did not differ among the CKD groups and was approximately 40%. Metformin showed a linear decrease across the groups, however approximately 21% in the severe CKD group received metformin. The use of dipeptidyl peptidase 4 inhibitors (DPP-4i) was approximately 20% and did not differ among groups. The DPP-4 inhibitor choice was:- 1% vildagliptin, 9% saxagliptin, 58% sitagliptin, and 32% linaglitpin. With respect to sitagliptin and saxagliptin, 72% and 62% received an inappropriately high dose in the setting of CKD.Conclusions
We observed that a considerable proportion of patients with type 2 diabetes and CKD were receiving metformin and non dose-adjusted DPP-4 inhibitors. Careful consideration of medication use and dosaging is required in the setting of CKD and type 2 diabetes. 相似文献96.
97.
Boczko EM Cooper TG Gedeon T Mischaikow K Murdock DG Pratap S Wells KS 《Proceedings of the National Academy of Sciences of the United States of America》2005,102(16):5647-5652
By using current biological understanding, a conceptually simple, but mathematically complex, model is proposed for the dynamics of the gene circuit responsible for regulating nitrogen catabolite repression (NCR) in yeast. A variety of mathematical "structure" theorems are described that allow one to determine the asymptotic dynamics of complicated systems under very weak hypotheses. It is shown that these theorems apply to several subcircuits of the full NCR circuit, most importantly to the URE2-GLN3 subcircuit that is independent of the other constituents but governs the switching behavior of the full NCR circuit under changes in nitrogen source. Under hypotheses that are fully consistent with biological data, it is proven that the dynamics of this subcircuit is simple periodic behavior in synchrony with the cell cycle. Although the current mathematical structure theorems do not apply to the full NCR circuit, extensive simulations suggest that the dynamics is constrained in much the same way as that of the URE2-GLN3 subcircuit. This finding leads to the proposal that mathematicians study genetic circuits to find new geometries for which structure theorems may exist. 相似文献
98.
Svensson P Södermark A Schulman S 《The hematology journal : the official journal of the European Haematology Association / EHA》2002,3(6):311-314
Extended treatment with vitamin K antagonists for more than 6 months is often used for secondary prevention of venous thromboembolism (VTE) in patients at high or moderate risk for recurrent events. The intensity of anticoagulant therapy is usually maintained at an International Normalized Ratio (INR) of 2-3. An INR of 1.5-2 might also prevent thromboembolic events with less complications of bleeding, but results from randomized trials are not yet available. In a non-prospective, uncontrolled study 40 patients with a history of VTE and an estimated high risk for recurrent events due to several previous events and/or thrombophilic defects were, after a median of 11.5 months on regular intensity anticoagulation (INR 2-3), switched to a low intensity regimen (INR 1.5-2). In six of the patients an estimated high risk for complications of bleeding contributed to this decision. After a median follow-up of 36 months (140 patient-years) recurrent events, complications of bleeding and some basic quality of life measurements regarding the new treatment were registered. No recurrent events, four minor bleedings and no major bleedings were registered. Twenty-six patients preferred an INR of 1.5-2 compared to 2-3. The main reasons for that preference were a lower risk for bleeding (13 patients) and less frequent monitoring of the INR (18 patients). No patient preferred full-dose anticoagulation at INR 2-3. In patients at a high risk for recurrence of VTE an initial period of regular intensity anticoagulation, followed by a low-intensity regimen, may provide effective and safe secondary prophylaxis. 相似文献
99.