全文获取类型
收费全文 | 2064篇 |
免费 | 135篇 |
国内免费 | 38篇 |
专业分类
耳鼻咽喉 | 32篇 |
儿科学 | 92篇 |
妇产科学 | 27篇 |
基础医学 | 206篇 |
口腔科学 | 48篇 |
临床医学 | 196篇 |
内科学 | 494篇 |
皮肤病学 | 111篇 |
神经病学 | 167篇 |
特种医学 | 222篇 |
外科学 | 203篇 |
综合类 | 34篇 |
预防医学 | 151篇 |
眼科学 | 9篇 |
药学 | 115篇 |
中国医学 | 3篇 |
肿瘤学 | 127篇 |
出版年
2021年 | 22篇 |
2020年 | 18篇 |
2019年 | 29篇 |
2018年 | 31篇 |
2017年 | 27篇 |
2016年 | 39篇 |
2015年 | 59篇 |
2014年 | 60篇 |
2013年 | 121篇 |
2012年 | 57篇 |
2011年 | 70篇 |
2010年 | 64篇 |
2009年 | 77篇 |
2008年 | 62篇 |
2007年 | 59篇 |
2006年 | 76篇 |
2005年 | 58篇 |
2004年 | 52篇 |
2003年 | 38篇 |
2002年 | 55篇 |
2001年 | 37篇 |
2000年 | 46篇 |
1999年 | 35篇 |
1998年 | 89篇 |
1997年 | 79篇 |
1996年 | 82篇 |
1995年 | 54篇 |
1994年 | 66篇 |
1993年 | 56篇 |
1992年 | 19篇 |
1991年 | 29篇 |
1990年 | 27篇 |
1989年 | 48篇 |
1988年 | 50篇 |
1987年 | 41篇 |
1986年 | 36篇 |
1985年 | 32篇 |
1984年 | 27篇 |
1983年 | 14篇 |
1982年 | 24篇 |
1981年 | 23篇 |
1980年 | 18篇 |
1979年 | 18篇 |
1978年 | 16篇 |
1977年 | 20篇 |
1976年 | 20篇 |
1975年 | 16篇 |
1974年 | 12篇 |
1973年 | 17篇 |
1972年 | 15篇 |
排序方式: 共有2237条查询结果,搜索用时 203 毫秒
121.
Infante C Idrovo AJ Sánchez-Domínguez MS Vinhas S González-Vázquez T 《Journal of immigrant and minority health / Center for Minority Public Health》2012,14(3):449-459
Thousands of Mexican and Central American migrants converge at the Mexico-United States border. Undocumented migrants in transit
to the United States are vulnerable due to their lack of access to health care and legal assistance. This study attempts to
provide evidence on the violent-related consequences that migration has on migrants. A mixed-method study was conducted between
April 2006-May 2007 in shelters in Baja California, Mexicali and Tijuana, Mexico. 22 in depth interviews were performed and
fifteen hundred and twelve migrants responded a questionnaire. Results from both in-depth interviews and the analysis of the
quantitative data shows the different types of violence experiences by migrants which include threats, verbal abuse, and arbitrary
detention based on ethnicity, as well as assaults, beatings and sexual violence. It is crucial to stress the importance and
the need to evidence the condition in which migrants’ transit to the US and to effectively respond to the violence they experience. 相似文献
122.
123.
Paul R. SierzenskiJoel M. Schofer MD LCDR MC USN Michael J. BaumanJason T. Nomura MD RDMS 《The Journal of emergency medicine》2011
Background: Emergency physicians commonly perform Focused Assessment with Sonography for Trauma (FAST) examinations to evaluate for free intraperitoneal fluid. Many ultrasound findings can be misinterpreted as free fluid, resulting in false-positive FAST examinations. Objectives: To describe a previously unreported ultrasound finding that can be misinterpreted as free intraperitoneal fluid. Case Report: A 32-year-old man was stabbed in the left upper abdomen. A FAST examination was performed and a right perinephric fat pad was interpreted as showing free fluid in Morison's pouch. After transfer to a trauma center, a repeat FAST examination revealed no signs of intraperitoneal free fluid. Wound exploration showed no signs of penetration into the peritoneal cavity. Conclusions: When performing a FAST examination, a wedge-shaped hypoechoic area in Morison's pouch that is bounded on both sides by echogenic lines (the “FAST Double-Line Sign”) is likely to represent perinephric fat and may result in a false-positive FAST examination. 相似文献
124.
125.
126.
127.
MC Chau SF Leung KM Kam KY Cheung WH Kwan KH Yu KW Chiu TC Chan 《Journal of Medical Imaging and Radiation Oncology》2007,51(5):480-484
To assess the dosimetric effect of using interpolated contours in planning intensity‐modulated radiation therapy (IMRT) for advanced T‐stage nasopharyngeal carcinoma. The present study focused on T3–T4 tumours where the proximity of targets to neurological organs poses a stringent test on the feasibility of such an approach. Contours of targets and organs were delineated on CT images of 2.5‐mm interval and a reference IMRT plan was generated. An investigative (INV) IMRT plan was then generated with the same planning protocol, but based on interpolated contours that replaced deleted contours on alternate slices. The reference and INV plans were compared. Regarding target coverage, all targets in the INV plans met the acceptance criteria except for the PTV in one case. Regarding organs, the mean dose to 1% volume of the brainstem and spinal cord in the INV plans were kept below their dose limits. No significant differences in the mean doses to others organs were found. Satisfactory target coverage and protection of critical organs to a degree similar to full‐scale contouring could be achieved with use of interpolated contours. The saving in manpower time for contouring is expected to significantly improve the throughput of the IMRT planning process. 相似文献
128.
María Pilar Vinardell Tomas Benavides Montserrat Mitjans María Rosa Infante Pere Claps Richard Clothier 《Food and chemical toxicology》2008,46(12):3837-3841
Extensive efforts have been made, recently, to find surfactants with lower irritancy potential than those presently commercially employed in pharmaceutical and cosmetic preparations. Cytotoxic and phototoxic effects of novel mono and diacylglycerol amino acid-based surfactants (glutamic acid, or arginine) were evaluated.All tested surfactants showed a clear concentration–response relationship to two immortalized cell lines, murine fibroblast cell line, 3T3, and one human keratinocyte cell line, HaCaT, demonstrated by and decrease of NR uptake. Concentrations resulting in 50% inhibition of NR uptake (IC50) range from 30 to 300 μg mL−1.The potential phototoxicity which could result in irritant products, was determined by modulated cytotoxicity via the resazurin reduction to resorufin and neutral red uptake (NRU) endpoints. Surfactants with two chains showed, in general, less cytotoxic but higher phototoxic effect than surfactants with only one chain. 相似文献
129.
Laura MC Welschen Patricia van Oppen Jacqueline M Dekker Lex M Bouter Wim AB Stalman Giel Nijpels 《BMC public health》2007,7(1):74
Background
In patients with type 2 diabetes, the risk for cardiovascular disease is substantial. To achieve a more favourable risk profile, lifestyle changes on diet, physical activity and smoking status are needed. This will involve changes in behaviour, which is difficult to achieve. Cognitive behavioural therapies focussing on self-management have been shown to be effective. We have developed an intervention combining techniques of Motivational Interviewing (MI) and Problem Solving Treatment (PST). The aim of our study is to investigate if adding a combined behavioural intervention to managed care, is effective in achieving changes in lifestyle and cardiovascular risk profile. 相似文献130.
Summers W. Taylor CPT MC U.S.A. Danny R. Barnhill LTC MC U.S.A. Thomas W. Burke MAJ MC U.S.A. W.Kenneth Linville CPT MC U.S.A. Irene Yevich MAJ MC U.S.A. 《Gynecologic oncology》1989,33(3):376-378
The folic acid antagonist, methotrexate, has many applications in the treatment of neoplastic disease. While methotrexate produces several well-recognized toxic effects, cutaneous reactions are rare. A patient who developed classical erythema multiforme while receiving low-dose methotrexate as treatment of nonmetastatic gestational trophoblastic neoplasia is presented. Erythema multiforme has been associated with a variety of pharmacologic agents. It typically presents as a pruritic papular dermatitis of the extensor surfaces of the extremities and may require multiple skin biopsies to establish the diagnosis. Spontaneous reversal usually occurs with discontinuation of therapy. Patients developing erythema multiforme related to antineoplastic agents should be switched to an alternate regimen. 相似文献