全文获取类型
收费全文 | 2634696篇 |
免费 | 209697篇 |
国内免费 | 4897篇 |
专业分类
耳鼻咽喉 | 35848篇 |
儿科学 | 87614篇 |
妇产科学 | 74902篇 |
基础医学 | 374178篇 |
口腔科学 | 75578篇 |
临床医学 | 236376篇 |
内科学 | 515615篇 |
皮肤病学 | 58610篇 |
神经病学 | 215993篇 |
特种医学 | 103116篇 |
外国民族医学 | 897篇 |
外科学 | 395509篇 |
综合类 | 64776篇 |
现状与发展 | 6篇 |
一般理论 | 970篇 |
预防医学 | 207250篇 |
眼科学 | 60893篇 |
药学 | 192583篇 |
3篇 | |
中国医学 | 5477篇 |
肿瘤学 | 143096篇 |
出版年
2018年 | 27443篇 |
2017年 | 21094篇 |
2016年 | 23767篇 |
2015年 | 27028篇 |
2014年 | 37928篇 |
2013年 | 57299篇 |
2012年 | 77429篇 |
2011年 | 81817篇 |
2010年 | 48322篇 |
2009年 | 46188篇 |
2008年 | 76971篇 |
2007年 | 81381篇 |
2006年 | 82628篇 |
2005年 | 80185篇 |
2004年 | 77755篇 |
2003年 | 74366篇 |
2002年 | 72283篇 |
2001年 | 125887篇 |
2000年 | 129507篇 |
1999年 | 108834篇 |
1998年 | 30517篇 |
1997年 | 27623篇 |
1996年 | 27562篇 |
1995年 | 26500篇 |
1994年 | 24511篇 |
1993年 | 23158篇 |
1992年 | 86262篇 |
1991年 | 83155篇 |
1990年 | 80625篇 |
1989年 | 77494篇 |
1988年 | 71814篇 |
1987年 | 70482篇 |
1986年 | 66631篇 |
1985年 | 63898篇 |
1984年 | 48289篇 |
1983年 | 41323篇 |
1982年 | 24725篇 |
1981年 | 22044篇 |
1979年 | 44742篇 |
1978年 | 31269篇 |
1977年 | 26309篇 |
1976年 | 24782篇 |
1975年 | 25744篇 |
1974年 | 31466篇 |
1973年 | 30381篇 |
1972年 | 28060篇 |
1971年 | 26127篇 |
1970年 | 24421篇 |
1969年 | 22751篇 |
1968年 | 21050篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
21.
Post-induction hypotension is common and associated with postoperative complications. We hypothesised that pneumatic leg compression reduces post-induction hypotension in elderly patients undergoing robot-assisted laparoscopic prostatectomy. In this double-blind randomised study, patients were allocated randomly to the pneumatic leg compression group (n = 50) or control (n = 50). In the intervention group, pneumatic leg compression was initiated before induction of anaesthesia. In the control group, pneumatic leg compression was initiated 20 min after anaesthesia induction. The primary outcome was the incidence of post-induction hypotension in these groups. Post-induction hypotension was defined as systolic blood pressure < 90 mmHg during the first 20 min after induction. Haemodynamic variables and area under the curve of post-induction systolic blood pressure over time were assessed. Complications associated with pneumatic leg compression were recorded, including: peripheral neuropathy; compartment syndrome; extensive bullae beneath the leg sleeves; and pulmonary thromboembolism. The incidence of post-induction hypotension decreased in the pneumatic leg compression group compared with that in the control group; 5 (10%) vs. 29 (58%), respectively, p < 0.001. In the pneumatic leg compression group, the lowest systolic, diastolic and mean blood pressures 20 min after induction of anaesthesia were significantly greater than the control group. Pneumatic leg compression resulted in an increased area under the curve of systolic blood pressure in the first 20 min after induction, p = 0.001. There were no pneumatic leg compression-related complications. Pneumatic leg compression reduced post-induction hypotension in elderly patients undergoing robot-assisted laparoscopic prostatectomy, suggesting that it is an effective and safe intervention to prevent post-induction hypotension among elderly patients undergoing general anaesthesia. 相似文献
22.
23.
24.
25.
Tengzhi Liu Kathrine Røe Redalen Morten Karlsen 《Journal of labelled compounds & radiopharmaceuticals》2022,65(7):191-202
Cyclotron-produced copper-64 radioisotope tracers offer the possibility to perform both diagnostic investigation by positron emission tomography (PET) and radiotherapy by a theranostic approach with bifunctional chelators. The versatile chemical properties of copper add to the importance of this isotope in medicinal investigation. [64Cu][Cu (ATSM)] has shown to be a viable candidate for imaging of tumor hypoxia; a critical tumor microenvironment characteristic that typically signifies tumor progression and resistance to chemo-radiotherapy. Various production and radiosynthesis methods of [64Cu][Cu (ATSM)] exist in labs, but usually involved non-standardized equipment with varying production qualities and may not be easily implemented in wider hospital settings. [64Cu][Cu (ATSM)] was synthesized on a modified GE TRACERlab FXN automated synthesis module. End-of-synthesis (EOS) molar activity of [64Cu][Cu (ATSM)] was 2.2–5.5 Ci/μmol (HPLC), 2.2–2.6 Ci/μmol (ATSM-titration), and 3.0–4.4 Ci/μmol (ICP-MS). Radiochemical purity was determined to be >99% based on radio-HPLC. The final product maintained radiochemical purity after 20 h. We demonstrated a simple and feasible process development and quality control protocols for automated cyclotron production and synthesis of [64Cu][Cu (ATSM)] based on commercially distributed standardized synthesis modules suitable for PET imaging and theranostic studies. 相似文献
26.
27.
28.
M.-A. Fauroux A. Germa P. Tramini C. Nabet 《Revue d'épidémiologie et de santé publique》2019,67(4):223-231
BackgroundThe aim of this study was to estimate the prevalence of dental prosthetic treatment and to investigate the demographic, social, economic and medical factors associated with the use of fixed and removable dentures in a representative sample of adults living in France.MethodsThe data were obtained from the 2002–2003 Decennial Health Survey, a cross-sectional study of a representative sample of the population living in France, which included 29,679 adults. Information was collected by interview. The variables collected were fixed denture, removable denture, age, gender, number of children, area of residence, nationality, educational attainment, family social status, employment status, annual household income per capita, supplementary insurance, chronic disease, eyesight problems/glasses, hearing problems/hearing aids. Multinomial logistic regression models were used to study the relationship between prosthetic treatment and demographic, socioeconomic and medical characteristics unadjusted, adjusted for age and adjusted for all the characteristics.ResultsThe prevalence of prosthetic treatment was 34.6% (95% confidence interval (CI): [34.1; 35.2]) for fixed prosthetic dentures and 13.8% (95% CI: [13.4; 14.2]) for removable prosthetic dentures. We showed a gradient between educational attainment and removable dentures; the odds ratio adjusted for all the variables (aOR) associated with no or primary education compared to post-secondary education was 2.56; 95% CI: [2.09; 3.13]. When annual household income per capita was low, subjects were less likely to report fixed dentures (aOR = 0.68; 95% CI: [0.62; 0.75]) than those with high annual household income per capita. Individuals without insurance less often reported fixed dentures than those with private insurance. Those reporting chronic disease were less likely to report fixed dentures (aOR = 0.87; 95% CI: [0.79; 0.95]) but more likely to report removable dentures (aOR = 1.29; 95% CI: [1.17; 1.43]) than those without chronic disease.ConclusionThis study reveals social, economic and medical inequalities in fixed and removable prosthetic treatment among adults in France. 相似文献
29.