全文获取类型
收费全文 | 53231篇 |
免费 | 4582篇 |
国内免费 | 111篇 |
专业分类
耳鼻咽喉 | 482篇 |
儿科学 | 1662篇 |
妇产科学 | 1548篇 |
基础医学 | 7911篇 |
口腔科学 | 826篇 |
临床医学 | 7130篇 |
内科学 | 9875篇 |
皮肤病学 | 883篇 |
神经病学 | 5311篇 |
特种医学 | 1323篇 |
外科学 | 5743篇 |
综合类 | 834篇 |
现状与发展 | 1篇 |
一般理论 | 76篇 |
预防医学 | 5969篇 |
眼科学 | 899篇 |
药学 | 3633篇 |
中国医学 | 57篇 |
肿瘤学 | 3761篇 |
出版年
2023年 | 375篇 |
2022年 | 538篇 |
2021年 | 1194篇 |
2020年 | 786篇 |
2019年 | 1215篇 |
2018年 | 1418篇 |
2017年 | 1107篇 |
2016年 | 1172篇 |
2015年 | 1237篇 |
2014年 | 1771篇 |
2013年 | 2378篇 |
2012年 | 3610篇 |
2011年 | 3799篇 |
2010年 | 2040篇 |
2009年 | 1868篇 |
2008年 | 3173篇 |
2007年 | 3288篇 |
2006年 | 2984篇 |
2005年 | 3126篇 |
2004年 | 2797篇 |
2003年 | 2640篇 |
2002年 | 2484篇 |
2001年 | 838篇 |
2000年 | 770篇 |
1999年 | 826篇 |
1998年 | 633篇 |
1997年 | 524篇 |
1996年 | 456篇 |
1995年 | 436篇 |
1994年 | 353篇 |
1993年 | 334篇 |
1992年 | 552篇 |
1991年 | 583篇 |
1990年 | 530篇 |
1989年 | 501篇 |
1988年 | 429篇 |
1987年 | 448篇 |
1986年 | 409篇 |
1985年 | 387篇 |
1984年 | 352篇 |
1983年 | 289篇 |
1982年 | 209篇 |
1981年 | 207篇 |
1980年 | 175篇 |
1979年 | 222篇 |
1978年 | 173篇 |
1977年 | 184篇 |
1976年 | 150篇 |
1974年 | 206篇 |
1973年 | 178篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
82.
Iain L. Campbell 《Journal of neuroimmunology》1996,71(1-2)
To elucidate the possible involvement of the inducible nitric oxide synthase (iNOS) and NO in the development of lymphocytic choriomeningitis (LCM), the consequences of inhibition of iNOS by the inhibitor aminoguanidine was examined in mice following intracerebral infection with LCM virus (LCMV). Aminoguanidine administration to mice infected with LCMV completely blocked increased plasma nitrate/nitrite levels and led to increased proinflammatory cytokine gene expression at early stages of lesion development in the brain, enhanced clinical severity and decreased survival time. The levels of LCMV recovered from the brain of aminoguanidine treated mice did not differ from those in infected control mice. These findings argue against either an anti-viral or pathogenic role of NO in LCM but rather suggest a possible protective action of this mediator. 相似文献
83.
84.
A comparison of the stressors experienced by parents of intubated and non-intubated children 总被引:3,自引:0,他引:3
Caroline Haines BN RGN RSCN Christine Perger BHSc Sue Nagy RN BA FRCNA FCN 《Journal of advanced nursing》1995,21(2):350-355
When children are ill enough to require admission to paediatric intensive care, parents may become distressed about their child's medical condition and this distress may be compounded by the unfamiliar nature of the highly technological environment Parents of children who are sick enough to warrant intubation are particularly likely to be exposed to a frightening array of technological equipment Seventy-one parents of intubated and non-intubated children completed the Parental Stressor Scale Paediatnc Intensive Care Unit (PSS PICU) Overall the findings suggest that parents were most distressed (a) by the painful procedures to which their children were subjected, (b) by the sights and sounds of the intensive care unit and (c) by their children's reactions to intensive care The behaviour of staff towards parents and the way that staff communicated with them caused the least distress When the levels of stress reported by parents of intubated children were compared with those reported by parents of non-intubated children, different patterns of stress were found Painful procedures were a source of greater stress to parents of intubated children whereas the behaviour of staff and the children's reactions to the intensive care experience caused greater stress to the parents of the non-intubated children In general the findings suggest that the needs of parents of non-intubated children are being overlooked, with staff focusing more of their attention on the parents of intubated children 相似文献
85.
Efficacy of the dorsal pedal bypass for limb salvage in diabetic patients: short-term observations 总被引:1,自引:0,他引:1
F B Pomposelli S J Jepsen G W Gibbons D R Campbell D V Freeman A Miller F W LoGerfo 《Journal of vascular surgery》1990,11(6):745-51; discussion 751-2
Limbs of diabetic patients with distal tibial disease are frequently considered unreconstructible; however, when studied with intraarterial digital subtraction angiography, the dorsal pedal artery is frequently found to be patent. We have reviewed our recent experience with 96 patients, 94% of whom had diabetes and had 97 bypasses placed to the dorsal pedal artery. All procedures were for limb salvage. Superimposed infection was present in 42.3%. In 92 instances where intraarterial digital subtraction angiography successfully visualized the dorsal pedal artery, 91 bypasses were placed. In 12 other cases where the dorsal pedal artery was not visualized by intraarterial digital subtraction angiography but audible with the continuous-wave Doppler, bypasses were completed successfully in six. All procedures were performed with vein. Inflow was taken from the femoral artery in 48, popliteal artery in 45, tibial artery in 2, and from a femoral tibial graft in 2. Perioperative mortality was 1.92%. Actuarial graft patency, limb salvage, and patient survival were 82%, 87%, and 80%, respectively at 18 months. We conclude that bypass grafting to the dorsal pedal artery can be reliably performed with acceptable short-term results. An attempt should always be made to visualize the foot vessels angiographically, especially in diabetic patients, so that this valuable option in arterial reconstruction will not be overlooked. 相似文献
86.
Helmut Seidel Barbara Harazin Kristina Pavlas Christine Sroka Jörg Richter Ralph Blüthner Udo Erdmann Jan Grzesik Barbara Hinz Reinhard Rothe 《International archives of occupational and environmental health》1988,61(1-2):95-106
Summary This study was carried out in order: (1) to examine the effects of isolated and combined prolonged exposures to noise and whole-body vibration on hearing, vision and subjectively experienced strain, and (2) to check the combined effects with repeated exposures. Six male subjects were exposed twice to noise (N) at 92 dBA, whole-body vibration (V) in the Z-axis at 4 Hz and 1.0 ms–2 rms, and noise and vibration (NV) for 90 min with each condition. Temporary threshold shifts of hearing (TTS) and their integrals (ITTS) were measured at 4, 6, 10, and 12 kHz. Visual acuity was examined by means of a very sensitive test. Cross-modality matching (CMM) of the handgrip force was used to judge the subjectively experienced strain. NV induced a clear tendency of higher TTS and ITTS than N, with several significant differences most pronounced at 10 kHz. With repeated exposures, the effect of NV decreased, while the reactions to N and V remained unchanged. The individual reactions to NV differed. The influence of the duration of exposures on vision depended on the condition; N caused time-dependent changes, whereas V did not. CMM-data increased with the duration of the exposure during V and NV. N was generally judged to be more straining than V; NV caused higher strain than V during the first 30 min of exposure only. Correlations between different effects suggest certain links between them. Additionally, less motivation — daily obtained by a questionnaire — often correlated with higher ITTS during N and NV. The results also illustrate the combined effects on the individual susceptibility, repetition of exposure, the kind of response, and, possibly, the actual psychic state.Abbreviations CMM
cross-modality matching
- MVC
maximum voluntary contraction force
- N
exposure condition: noise level 92dBA, no whole-body vibration
- NV
exposure condition: combined exposure to noise with a level of 92 dBA and wholebody vibration with 4 Hz, 1 ms–2 rms
- V
exposure condition: whole-body vibration with 4 Hz, 1 ms–2 rms
- TTS
temporary threshold shift
- ITTS
integral of temporary threshold shift
- WBV
whole-body vibration in the common sense
This work was done in the Temporary International Research Team on Combined Effects of Noise and Vibration of the Council of Mutual Economic Assistance of the Socialist Countries. The authors gratefully acknowledge the help and assistance of L.-M. Brumm, Y. Bening, M. Godau, G. Weber, and R. Vizcaino. 相似文献
87.
M. R. McGinnis G. Campbell W. K. Gourley H. L. Lucia 《European journal of epidemiology》1992,8(3):383-386
A case of phaeohyphomycosis caused by Bipolaris spicifera involving the brain and sinuses is presented. The patient survived following surgery and ketoconazole therapy, which successfully treated both the sinus and the brain infections. 相似文献
88.
89.
90.