全文获取类型
收费全文 | 20658篇 |
免费 | 1284篇 |
国内免费 | 59篇 |
专业分类
耳鼻咽喉 | 335篇 |
儿科学 | 1108篇 |
妇产科学 | 503篇 |
基础医学 | 1808篇 |
口腔科学 | 357篇 |
临床医学 | 1621篇 |
内科学 | 4974篇 |
皮肤病学 | 335篇 |
神经病学 | 1060篇 |
特种医学 | 730篇 |
外科学 | 3727篇 |
综合类 | 451篇 |
一般理论 | 3篇 |
预防医学 | 1095篇 |
眼科学 | 894篇 |
药学 | 1572篇 |
1篇 | |
中国医学 | 73篇 |
肿瘤学 | 1354篇 |
出版年
2023年 | 149篇 |
2022年 | 293篇 |
2021年 | 766篇 |
2020年 | 418篇 |
2019年 | 613篇 |
2018年 | 718篇 |
2017年 | 502篇 |
2016年 | 503篇 |
2015年 | 525篇 |
2014年 | 792篇 |
2013年 | 1011篇 |
2012年 | 1519篇 |
2011年 | 1381篇 |
2010年 | 865篇 |
2009年 | 681篇 |
2008年 | 1029篇 |
2007年 | 1035篇 |
2006年 | 954篇 |
2005年 | 892篇 |
2004年 | 800篇 |
2003年 | 682篇 |
2002年 | 606篇 |
2001年 | 479篇 |
2000年 | 511篇 |
1999年 | 404篇 |
1998年 | 161篇 |
1997年 | 138篇 |
1996年 | 118篇 |
1995年 | 117篇 |
1994年 | 104篇 |
1993年 | 82篇 |
1992年 | 279篇 |
1991年 | 250篇 |
1990年 | 219篇 |
1989年 | 211篇 |
1988年 | 172篇 |
1987年 | 176篇 |
1986年 | 155篇 |
1985年 | 168篇 |
1984年 | 147篇 |
1983年 | 141篇 |
1982年 | 65篇 |
1981年 | 75篇 |
1979年 | 116篇 |
1978年 | 86篇 |
1977年 | 63篇 |
1974年 | 75篇 |
1973年 | 110篇 |
1972年 | 100篇 |
1971年 | 68篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
1.
2.
3.
Rohi Shah Nomaan Sheikh Jitendra Mangwani Nicolette Morgan Hamidreza Khairandish 《Journal of Clinical Orthopaedics and Trauma》2021,12(1):138
Demographic projections for hip fragility fractures indicate a rising annual incidence by virtue of a multimorbid, ageing population with more noncommunicable diseases (NCDs). NCDs are characterised by slow progression and long duration ranging from ischaemic cardiovascular disease, cerebrovascular disease, diabetes, chronic obstructive pulmonary disease to various cancers. Management of this disease burden often involves commencing patients on oral anticoagulants to reduce the risk of thromboembolic events. The use of direct oral anticoagulants (DOACs) in clinical practice has increased due to their rapid onset of action, short half-life and predictable anticoagulant effects, without the need for routine monitoring. Safe and timely surgical intervention relies on reversal of anticoagulants. However, the lack of specific evidence-based guidelines for the perioperative management of patients on DOACs with hip fractures has proved challenging; in particular, the accessibility of DOAC-specific assays, justification of the cost-benefit ratio of targeted reversal agents and indications for neuraxial anaesthesia. This has led to potentially avoidable delays in surgical intervention. Following a literature review of the pharmacokinetic and pharmacodynamics of commonly used DOACs in our region including the role of surrogate markers, we propose a systematic, evidence-based guideline to the perioperative management of hip fractures DOACs. We believe this standardised protocol can be easily replicated between hospitals. We recommend that if patients are deemed suitable for a general anaesthesia, with satisfactory renal function, optimal surgical time should be 24 h following the last ingested dose of DOAC. 相似文献
4.
5.
6.
Bryan Mclaughlin JungHwan Yang Woohyun Yoo Bret Shaw Soo Yun Kim Dhavan Shah 《Health communication》2016,31(6):762-771
The growth of online support groups has led to an expression effects paradigm within the health communication literature. Although religious support expression is characterized as a typical subdimension of emotional support, we argue that in the context of a life-threatening illness, the inclusion of a religious component creates a unique communication process. Using data from an online group for women with breast cancer, we test a theoretical expression effects model. Results demonstrate that for breast cancer patients, religious support expression has distinct effects from general emotional support messages, which highlights the need to further theorize expression effects along these lines. 相似文献
7.
8.
9.
10.
Shakil Saba Muhammad Sajid Hamid Akash Kanwal Rehman Uzma Saleem Fareeha Fiayyaz Tanvir Ahmad 《Clinical and experimental pharmacology & physiology》2020,47(10):1682-1691
Arsenic (As) and cadmium (Cd) have recently emerged as major health concerns owing to their strong association with diabetes mellitus (DM). We aimed to investigate the heavy metals exposure towards incidence of DM at various enzymatic and hormonal levels. Additionally, association of As and Cd with Zinc (Zn, essential metal) was also evaluated. Spot urine samples were collected to assess As, Cd and Zn through ICP-OES. Serum was analyzed by assay method for fasting blood glucose, liver and renal function biomarkers. ELISA was performed to investigate the impact of heavy metals on HbA1c, α-amylase, DPP-IV, IGF-1, leptin, GSH, MDA, SOD, HDL, FFA, TG and interleukin (IL)-6. Association of heavy metals with DM was measured by odds ratio (OR) and level of significance was assessed by Chi-squared test. Unpaired student's t-test was used to compare DM-associated risk factors in heavy metals-exposed and unexposed participants. As and Cd were detectable in 75.4% and 83% participants with mean concentration of 75.5 ppb and 54.5 ppb, respectively. For As exposure, OR in the third quartile was maximum ie 1.34 (95% CI, 0.80 to 2.23), however the result was not statistically significant (P > .05). For Cd exposure, OR in the fourth quartile was considerably high, 1.62 (95% CI, 1.00 to 2.61), with a significant probability value (P < .05). Urinary Cd was negatively associated with Zn. As and Cd exposure increases the incidence of DM in the general population. Impaired hormonal and enzymatic levels in diabetic and non-diabetic exposed participants reflect the multiple organ damage by heavy metal exposure. 相似文献