首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   67675篇
  免费   5539篇
  国内免费   2525篇
耳鼻咽喉   485篇
儿科学   1325篇
妇产科学   2232篇
基础医学   7524篇
口腔科学   1407篇
临床医学   5412篇
内科学   6982篇
皮肤病学   902篇
神经病学   4566篇
特种医学   1861篇
外国民族医学   11篇
外科学   5110篇
综合类   10686篇
现状与发展   6篇
一般理论   6篇
预防医学   6226篇
眼科学   1871篇
药学   9254篇
  74篇
中国医学   6769篇
肿瘤学   3030篇
  2024年   141篇
  2023年   1147篇
  2022年   1681篇
  2021年   2895篇
  2020年   2591篇
  2019年   2382篇
  2018年   2249篇
  2017年   2259篇
  2016年   2217篇
  2015年   2117篇
  2014年   3914篇
  2013年   4910篇
  2012年   3948篇
  2011年   4364篇
  2010年   3449篇
  2009年   3101篇
  2008年   3098篇
  2007年   3123篇
  2006年   2729篇
  2005年   2473篇
  2004年   2094篇
  2003年   2065篇
  2002年   1553篇
  2001年   1438篇
  2000年   1207篇
  1999年   1129篇
  1998年   989篇
  1997年   969篇
  1996年   738篇
  1995年   870篇
  1994年   731篇
  1993年   624篇
  1992年   572篇
  1991年   506篇
  1990年   522篇
  1989年   455篇
  1988年   348篇
  1987年   301篇
  1986年   364篇
  1985年   472篇
  1984年   447篇
  1983年   281篇
  1982年   366篇
  1981年   288篇
  1980年   299篇
  1979年   227篇
  1978年   189篇
  1977年   178篇
  1976年   167篇
  1975年   118篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
101.
OBJECTIVE: . The aim of this study was to assess clinical staff's opinions on the results of in-patient satisfaction surveys and their use within the quality improvement process. SETTING: The institution is a 2200-bed teaching hospital of tertiary health care employing 8000 professionals. Patient satisfaction surveys are carried out each year using a validated questionnaire mailed to a random sample of patients. The specific results of each department are sent to the medical and paramedical managers. METHODS: We conducted a questionnaire survey on 500 care providers randomly selected in every medical and surgical department. RESULTS: A total of 261 questionnaires were returned and analysed. Overall, 94% of responders had a favourable opinion of the patient satisfaction surveys. They considered that the patient was able to judge hospital service quality, especially in its relational, organizational, and environmental dimensions. The specific results for the department were less well known than the overall hospital results (60 versus 76%). These results were formally discussed in the department according to 40% of responders; 40% declared that these data resulted in improvement actions and considered that they led to modifications in their behaviour with patients. CONCLUSIONS: Despite a declared interest in satisfaction surveys, the results remain underused by hospital staff and insufficiently discussed within teams.  相似文献   
102.
103.
104.
经承学  谢湘芝 《广西医学》2002,24(2):153-155
目的:应用原位PCR技术检测B细胞系恶性淋巴瘤。方法:采用免疫球蛋白重链(IgH)基因第三互补决定区(CDR-Ⅲ)的引物,dig-11-dUTP标记物,应用直接原位PCR技术检测Ⅲ-Ⅳ级恶性淋巴瘤的间期淋巴细胞,结果:在初诊的15例恶性淋巴瘤患中,12例检测到IgH基因重排;4例临床表现呈现淋巴瘤性白血病患,治疗后骨髓完全缓解,2例间期细胞原位PCR仍显示有IgH基因重排,6个月复发,结论:间期细胞原位PCR技术能敏感、准确地检测Ⅲ级以上的恶性淋巴瘤,并帮助预测复发,为一有效的基因诊断方法。  相似文献   
105.
Although there are effective antibacterial agents against plague, newer antibacterial agents have been developed which show more potent activity against other bacterial organisms, but have not been tested againstYersinia pestis. A strain ofYersinia pestis was selected (no. 22; National Institute of Infectious Diseases, Tokyo, Japan) that caused a systemic infection in mice.Y. pestis no. 22 was intraperitoneally inoculated into DDY-strain mice, and 13 oral or 6 injectable antibacterial drugs given to the infected mice at varying doses 1 and 24 hours after infection. Levofloxacin, sparfloxacin and ofloxacin were the most effective oral agents against the infection, and prulifloxacin and pazufloxacin were also effective but to a lesser extent. Also, gentamicin and arbekacin were the most potent injectable antibacterial agents againstY. pestis. These results suggest that there are several new drugs, both oral and injectable, which exert excellent in vivo antibacterial activity against a mouse infection model and may be useful for the clinical treatment of plague.  相似文献   
106.
Basic fibroblast growth factor (bFGF) has been shown to be involved in epiretinal membrane formation in proliferative vitreoretinal disorders. However, up to now, little knowledge exists, as to the actual cellular source of this potent mitogen.We examined 20 epiretinal membranes from patients with proliferative diabetic retinopathy (PDR) (n = 12) and proliferative vitreoretinopathy (PVR) (n = 8) for the presence of bFGF peptide, fibroblast growth factor receptor-1 (FGFR-1) and bFGF messenger ribonucleic acid (mRNA).Using a specific antibody, we detected bFGF peptide in most (8/10) examined PDR membranes and in all (8/8) PVR membranes. Moreover, we found positive staining for the corresponding receptor.Local production of bFGF in epiretinal membranes was confirmed by nonisotopic in situ hybridisation for bFGF mRNA in some (4/7) examined PDR membranes and some (3/4) examined PVR membranes. All membranes which contained bFGF mRNA were also positive for bFGF peptide.In conclusion, bFGF is produced and stored in epiretinal membranes. Together with the corresponding receptor, bFGF may play a role in the auto- and paracrine control of the proliferative processes at the vitroretinal interface.Abbreviations aFGF acidic fibroblast growth factor - bFGF basic fibroblast growth factor - FGFR-1 fibroblast growth factor receptor-1 - mRNA messenger ribonucleic acid  相似文献   
107.
108.
While adult mice receiving picrotoxin (PTX) alone responded with clonic and tonic-clonic seizures, this response was greatly suppressed for mice simultaneously injected with 2,3-butanedione monoxime (BDM). For example, 60% and 10% of the mice convulsed when injected (i.p.) with 3.0 mg/kg PTX alone or PTX plus 205 mg/kg of BDM, respectively. In contrast, a non-oxime analogue of BDM, 2,3-butanedione (BTD), did not have this anticonvulsant effect. In order to explore the basis for the anticonvulsant effect of BDM, we recorded GABA-activated currents (IGABA) of frontal cortical as well as ventromedial hypothalamic neurons before, during and after exposure to this oxime. BDM had a biphasic effect on concentrations (100 μM-40 mM) decreased and lower concentrations (0.01 μM–0.001 μM) potentiatedIGABA; these effects of BDM reversed upon washout of the oxime. In contrast, BTD had no effect onIGABA. Finally, when 0.001 μM BDM, 10–30 μM PTX and GABA were co-applied the inhibitory effect of the toxin onIGABA was markedly suppressed. These data suggest that the anticonvulsant effect of oximes involves facilitation of the inhibitory action of GABA.  相似文献   
109.
豚鼠耳蜗微血管内皮细胞体外通透性的研究   总被引:1,自引:0,他引:1  
目的 研究豚鼠耳蜗微血管内皮细胞的体外通透性特征。方法 在成功建立豚鼠耳蜗微血管内皮细胞体外通透性模型的基础上 ,研究该体外模型跨细胞电阻及对12 5I 牛血清白蛋白的通透性。结果 ①耳蜗微血管内皮细胞在培养增殖过程中其跨细胞电阻呈动态变化过程 ,以 5× 10 4/cm2 的细胞密度接种时 ,7d左右电阻到达峰值 ,其跨细胞电阻峰值大小为 (118 9± 18 5 )Ω/cm2 ;②体外模型中加入12 5I 牛血清白蛋白后 ,其通透性呈上升期抛物线型曲线 ,90min内几乎呈直线。结论 跨细胞电阻及对12 5I 牛血清白蛋白变化曲线能反映体外耳蜗微血管内皮细胞的通透性特征  相似文献   
110.
With the advent of genomics, combinatorial paradigms and high-throughput screen (HTS)-based pharmacological testing, the number of compounds flowing through the discovery pipeline is likely to escalate. At the same time, with increased knowledge of the human drug-metabolizing enzymes and the availability of in vitro absorption-metabolism (AM) models, Preclinical Drug Metabolism is poised to meet the challenges of HTS. In order to be successful, however, a rational HTS strategy (vs. serendipitous HTS) has to be employed. Such a strategy is based on automation, validation and integration of in vitroAM models and database management (AVID). A generalized strategy for rational (AVID-based) HTS in Preclinical Drug Metabolism is described briefly.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号