全文获取类型
收费全文 | 42212篇 |
免费 | 2994篇 |
国内免费 | 2257篇 |
专业分类
耳鼻咽喉 | 1542篇 |
儿科学 | 343篇 |
妇产科学 | 156篇 |
基础医学 | 5885篇 |
口腔科学 | 1576篇 |
临床医学 | 3660篇 |
内科学 | 2645篇 |
皮肤病学 | 432篇 |
神经病学 | 8821篇 |
特种医学 | 1831篇 |
外国民族医学 | 3篇 |
外科学 | 7125篇 |
综合类 | 5647篇 |
一般理论 | 3篇 |
预防医学 | 1478篇 |
眼科学 | 2560篇 |
药学 | 1906篇 |
33篇 | |
中国医学 | 1083篇 |
肿瘤学 | 734篇 |
出版年
2024年 | 102篇 |
2023年 | 701篇 |
2022年 | 1213篇 |
2021年 | 1623篇 |
2020年 | 1613篇 |
2019年 | 1327篇 |
2018年 | 1302篇 |
2017年 | 1547篇 |
2016年 | 1514篇 |
2015年 | 1495篇 |
2014年 | 2455篇 |
2013年 | 2596篇 |
2012年 | 2070篇 |
2011年 | 2316篇 |
2010年 | 2025篇 |
2009年 | 1910篇 |
2008年 | 2090篇 |
2007年 | 2012篇 |
2006年 | 1826篇 |
2005年 | 1599篇 |
2004年 | 1422篇 |
2003年 | 1276篇 |
2002年 | 1166篇 |
2001年 | 1004篇 |
2000年 | 836篇 |
1999年 | 766篇 |
1998年 | 773篇 |
1997年 | 714篇 |
1996年 | 585篇 |
1995年 | 533篇 |
1994年 | 476篇 |
1993年 | 409篇 |
1992年 | 436篇 |
1991年 | 374篇 |
1990年 | 382篇 |
1989年 | 293篇 |
1988年 | 259篇 |
1987年 | 261篇 |
1986年 | 250篇 |
1985年 | 368篇 |
1984年 | 296篇 |
1983年 | 198篇 |
1982年 | 220篇 |
1981年 | 197篇 |
1980年 | 183篇 |
1979年 | 123篇 |
1978年 | 86篇 |
1977年 | 73篇 |
1976年 | 58篇 |
1975年 | 34篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
《Cirugía espa?ola》2021,99(8):585-592
- Download : Download high-res image (218KB)
- Download : Download full-size image
3.
《The Journal for Nurse Practitioners》2022,18(2):232-235
The coronavirus disease 2019 pandemic disrupted health care, requiring organizational leaders to act quickly to manage the health-related concerns of individuals and communities. The ability to offer a variety of digitally enabled telehealth services with 24/7 access to nurse practitioners and physician assistants allowed us to care for patients in their homes. It reduced the spread of the virus, protected our employees from further disease spread, and provided early interventions to those in need. The roles of nurse practitioner leaders, the enacted strategies, and patient outcomes demonstrate the impact of an innovative digital care delivery model on care across the continuum. 相似文献
4.
5.
6.
《Revista brasileira de otorrinolaringologia (English ed.)》2015,81(3):264-269
IntroductionThere is still no consensus in the literature as to the best acoustic stimulus for capturing vestibular evoked myogenic potential (VEMP). Low-frequency tone bursts are generally more effective than high-frequency, but recent studies still use clicks. Reproducibility is an important analytical parameter to observe the reliability of responses.ObjectiveTo determine the reproducibility of p13 and n23 latency and amplitude of the VEMP for stimuli with different tone-burst frequencies, and to define the best test frequency.MethodsCross-sectional cohort study. VEMP was captured in 156 ears, on the sternocleidomastoid muscle, using 100 tone-burst stimuli at frequencies of 250, 500, 1000, and 2000 Hz, and sound intensity of 95 dB nHL. Responses were replicated, that is, recorded three times on each side.ResultsNo significant difference was observed for p13 and n23 latencies of the VEMP, captured at three moments with tone-burst stimuli at 250, 500, and 1000 Hz. Only the frequency of 2000 Hz showed a difference between captures of this potential (p < 0.001). p13 and n23 amplitude analysis was also similar in the test–retest for all frequencies analyzed.Conclusionp13 and n23 latencies and amplitudes of VEMP for tone-burst stimuli at frequencies of 250, 500, and 1000 Hz are reproducible. 相似文献
7.
8.
Biodegradable Polydioxanone Microspheres for Transcatheter Arterial Embolization: Proof of Principle
《Journal of vascular and interventional radiology : JVIR》2020,31(12):2132-2140.e5
PurposeTo evaluate feasibility, embolization success, biodegradability, reperfusion, and biocompatibility of biodegradable microspheres (MS) made from polydioxanone (PDO) for transcatheter arterial embolization.Materials and MethodsUnilateral selective renal embolization of a segmental artery was performed in 16 New Zealand White rabbits with PDO-MS (100–150 μm and 90–315 μm). Animals were randomly assigned to different observation periods and underwent control digital subtraction angiography (DSA) and MR imaging immediately (n = 3), 1 week (n = 2), 4 weeks (n = 2), 8 weeks (n = 2), 12 weeks (n = 5), and 16 weeks (n = 2) after embolization. Kidneys were harvested for macroscopic and histologic analysis of embolization success, biodegradability, and biocompatibility.ResultsEmbolization was technically successful in 15 of 16 animals. One animal died of anesthesia-related circulatory failure. The 100–150 μm MS were injected easily through 3-F catheters; the 90–315 μm MS tended to clog with intermittent catheter obstruction. DSA and MR imaging showed successful target embolization in 13 of 15 animals. In 2 animals, the entire kidney was affected owing to catheter clogging, including a reflux of MS while flushing. Control DSA and MR imaging showed increasing vascular reperfusion with time. Macroscopic and histologic analysis revealed necrosis/infarction in areas in which embolization was achieved. MS were extensively degraded after 16 weeks, and overall inflammatory reaction was mild.ConclusionsBiodegradable PDO-MS induced effective embolization of target vessels while demonstrating good biocompatibility. MS increasingly dissolved at 16 weeks, partial reperfusion started at week 1, and complete reperfusion started at week 8, thus offering possible advantages as a temporary embolic agent. 相似文献
9.
10.
《Journal of vascular and interventional radiology : JVIR》2020,31(6):986-992
PurposeTo assess the feasibility, safety, and efficacy of balloon-assisted delivery of ethylene vinyl alcohol copolymer (EVOH) for a range of peripheral arterial applications.Materials and MethodsSix academic medical centers entered retrospective data on 46 consecutive patients (27 men, 19 women; ages, 11–94 y; mean age, 50.3 y) who underwent 60 balloon-assisted EVOH procedures. The cohort was restricted to procedures involving peripheral, nonneural arteries 1–5.5 mm in diameter. Clinical indications included a wide range of vascular pathologic conditions (most commonly arteriovenous malformations [n = 20], renal angiomyolipomas [n = 8], and acute hemorrhage [n = 9]) and targeted visceral and musculoskeletal peripheral arteries. Data collected included sex, age, clinical indication, arterial pathology, arteries embolized, type of occlusion balloon microcatheter, type and concentration of EVOH agent, effectiveness as an embolic backstop, vessels protected, adequacy of EVOH cast penetration, catheter extraction, nontarget embolization, and complications.ResultsBalloon occlusion prevented EVOH reflux in 59 of 60 procedures (98.3%). Nontarget EVOH embolization occurred in 2 procedures (3.3%). Adequate EVOH cast penetration and complete filling of the target pathologic structure were seen in 57 of 60 procedures (95%). Balloon deflation and uneventful extraction occurred in all procedures; small EVOH fragments detached into target arteries in 2 cases. One major (1.7%) and 2 minor (3.3%) complications occurred.ConclusionsBalloon-assisted EVOH embolization of peripheral arteries is feasible, safe, effective, and versatile. The primary advantage of balloon-assisted EVOH embolization is the ability to apply more injection pressure to advance the EVOH cast assertively into the pathologic structure(s). 相似文献