全文获取类型
收费全文 | 139548篇 |
免费 | 12285篇 |
国内免费 | 6295篇 |
专业分类
耳鼻咽喉 | 409篇 |
儿科学 | 4398篇 |
妇产科学 | 696篇 |
基础医学 | 8879篇 |
口腔科学 | 876篇 |
临床医学 | 20072篇 |
内科学 | 20420篇 |
皮肤病学 | 695篇 |
神经病学 | 8954篇 |
特种医学 | 6151篇 |
外国民族医学 | 8篇 |
外科学 | 27625篇 |
综合类 | 25682篇 |
现状与发展 | 17篇 |
一般理论 | 3篇 |
预防医学 | 7087篇 |
眼科学 | 1443篇 |
药学 | 12627篇 |
117篇 | |
中国医学 | 8380篇 |
肿瘤学 | 3589篇 |
出版年
2024年 | 516篇 |
2023年 | 2744篇 |
2022年 | 4750篇 |
2021年 | 7220篇 |
2020年 | 6195篇 |
2019年 | 5060篇 |
2018年 | 4823篇 |
2017年 | 5312篇 |
2016年 | 5608篇 |
2015年 | 5371篇 |
2014年 | 9136篇 |
2013年 | 10432篇 |
2012年 | 8171篇 |
2011年 | 9036篇 |
2010年 | 7528篇 |
2009年 | 6972篇 |
2008年 | 6973篇 |
2007年 | 7000篇 |
2006年 | 6542篇 |
2005年 | 5857篇 |
2004年 | 4924篇 |
2003年 | 4510篇 |
2002年 | 3378篇 |
2001年 | 3021篇 |
2000年 | 2476篇 |
1999年 | 1963篇 |
1998年 | 1748篇 |
1997年 | 1555篇 |
1996年 | 1379篇 |
1995年 | 1178篇 |
1994年 | 966篇 |
1993年 | 743篇 |
1992年 | 680篇 |
1991年 | 546篇 |
1990年 | 438篇 |
1989年 | 455篇 |
1988年 | 359篇 |
1987年 | 314篇 |
1986年 | 288篇 |
1985年 | 406篇 |
1984年 | 285篇 |
1983年 | 183篇 |
1982年 | 215篇 |
1981年 | 206篇 |
1980年 | 153篇 |
1979年 | 140篇 |
1978年 | 98篇 |
1977年 | 84篇 |
1976年 | 75篇 |
1975年 | 43篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
101.
102.
Sources of P300 attenuation after head injury: Single-trial amplitude, latency jitter, and EEG power
Single trial amplitude, latency jitter, and electroencephalographic (EEG) power were examined as sources of the group difference in averaged P300 amplitude among 15 traumatically brain injured and 20 control individuals in an auditory oddball paradigm. Mean amplitude of the individual trials was highly correlated with the amplitude of the averaged P300, with little additional unique variance attributable to latency jitter or EEG power. The group difference in P300 amplitude was also explained by the mean amplitude of the single trials. These results support the robustness of the event-related potential averaging technique within the paradigm used. 相似文献
103.
C. Shustik B. M. Jamison C. Alfieri S. Scherer R. Loertscher 《British journal of haematology》1995,91(1):167-168
Summary Allotransplantation of solid organs transfers passenger leucocytes which may give rise to a state of persistent microchimaerism. In this report we describe the case of a patient who developed a solitary plasmacytoma in a transplanted kidney more than 10 years after allografting. The diagnosis was established on the basis of the presence of a monoclonal IgG kappa peak in the serum, and light chain proteinuria, the plasmacytoid features of tumour cells including cell surface expression of IgG, kappa light chains, CD20, CD38 and CD56, the absence of lytic bone lesions and a normal bone marrow biopsy, and the disappearance of the monoclonal IgG peak after graft nephrectomy. A donor origin of the tumour was established by HLA DNA typing of tumour, tumour-free kidney tissue, and peripheral blood leucocytes, respectively. 相似文献
104.
105.
The granulocyte colony-stimulating factor (G-CSF) has been shown to accelerate recovery from severe neutropenia and to decrease the incidence of documented infections after intensive chemotherapy in cancer patients. However, the routine prophylactic use of G-CSF is expensive. This study was conducted to determine the role of G-CSF as adjunct therapy for septicemia following neutropenia caused by chemotherapy in children with acute leukemia. Fifty consecutive episodes of septicemia were studied involving 34 episodes of Gram-negative, 7 episodes of Gram-positive, 5 episodes of polymicrobial bacterial septicemia, one episode of fungemia, and 3 episodes of disseminated fungal infection. In the first 25 episodes, G-CSF was not used (group A). For the next 16 episodes, G-CSF 200 μg per square meter per day subcutaneously was given immediately after the septicemia was documented until the absolute neutrophil count was maintained at more than 1,500 per cubic millimeter (group B). Thereafter, G-CSF at the same dose as that of group B was prophylactically used in all the children who received high-dose cytosine arablnc-side-containing regimens. Nine episodes of septicemia occurred (group C). The incidences of mortality per episode of septicemia in groups A, B, and C were 12.0% (3/25), 12.5% (2/16) and 0% (0/9), respectively. Statistically, there was no difference between the three groups overall and in pair-wise comparisons (all P > 0.5). The durations of G-CSF administration in group B ranged from 6 to 26 days with a median of 12 days and the durations of G-CSF administration in group C ranged from 10 to 23 days with a median of 19 days. With or without G-CSF, there may be no significant difference in the mortality of septicemia following neutropenia caused by chemotherapy in children with acute leukemia. 相似文献
106.
本研究从急性低氧对移居海平面后藏族的体力活动能力的影响来探索藏族的高原低氧适应机制。结果揭示藏族的最大体力负荷强度没有显著下降,最大氧耗和氧脉搏也没有明显变化,动脉血氧饱和度明显高于汉族,这更显示藏族对高原低氧适应机制有独特之处。推测可能是藏族在氧的摄取、传递和释放过程比汉族更有利于对高原低氧环境的适应。 相似文献
107.
Periannan Kuppusamy Penghai Wang Michael Chzhan Jay L. Zweier 《Magnetic resonance in medicine》1997,37(4):479-483
The application of electron paramagnetic resonance imaging (EPRI) to obtain information from biological samples has been limited by the lack of ideal single line radical labels. The commonly used nitroxides exhibit multiple lines causing either hyperfine-based limitations in the maximum obtainable image resolution or hyperfine-based artifacts in the reconstructed image. The use of a novel single-line triarylmethyl paramagnetic label that enables marked enhancement in image quality and resolution is reported. This label exhibits a single line EPR spectrum that is sharp (linewidth ~60 mG in the absence of oxygen) and relatively stable in tissues. The potential of this label in enabling high resolution EPR imaging of biological samples was demonstrated in a series of phantoms and isolated biological organs such as the rat kidney. The images demonstrate that resolutions better than 100 μm could be obtained at L-band on samples of up to 20 mm in size. 相似文献
108.
P. Peeters J. Sennesael H. De Raeve M. De Waele D. Verbeelen 《Transplant international》1997,10(6):471-474
Lymphoma in immunocompromised transplant patients is a feared cause of morbidity and mortality. Superimposed on the lymphoma
and the transplantation immunosuppression is a rare condition: hemophagocytic syndrome (HS). HS is characterized by fever,
hepatosplenomegaly and lymphadenopathy, skin rashes, jaundice, coagulopathy, and phagocytosis of blood elements with pancytopenia.
Here we describe a rare but fatal case of a kidney transplant patient who developed T-cell lymphoma and HS, without evidence
of EBV replication. A short review of the diagnosis, treatment, and prognosis of HS is given.
Received: 4 March 1997 Received after revision: 6 June 1997 Accepted: 30 June 1997 相似文献
109.
狗脊髓截除自体隐神经大网膜移植的初步观察 总被引:3,自引:0,他引:3
实验用6只狗于T13处切除脊髓8mm,局部用隐神经、大网膜移植。对照组6只狗单纯切除脊髓8mm。术后3个月、6个月实验组动物全部恢复到C/Ⅲ级功能,组织学切片见移植神经有不同程度存活,可记录到股四头肌、胫前肌电位。对照组动物仅达到0/0~A/I织功能,组织学切片见脊髓缺损处为结缔组织,诱电位波形消失。分析了影响脊髓神经功能恢复的原因。 相似文献
110.
神经移位修复臂丛神经根性撕脱伤 总被引:3,自引:2,他引:1
1987年7月~1994年6月,对21例臂丛神经根性撕脱伤采用神经移位修复。其中复合移位4组神经(膈神经、副神经、颈丛运动支、肋间神经)者1例,3组(膈神经、副神经、颈丛运动支)者6例,2组(膈神经、副神经)者9例,1组(膈神经或颈丛运动支或肋间神经)者5例。术中发现臂丛神经变异1例,对4例合并锁骨下动脉损伤者,在神经移位的同时进行血管修复,促进患肢的血液循环,有利于神经的康复。随访到19例,随访时间为8个月~6年2个月,优良率达73.7%。认为,神经移位术是修复神经根性撕裂伤的常规方法,合并血管损伤者也应同时修复,对促进神经功能恢复有利 相似文献