全文获取类型
收费全文 | 14312篇 |
免费 | 1055篇 |
国内免费 | 182篇 |
专业分类
耳鼻咽喉 | 82篇 |
儿科学 | 287篇 |
妇产科学 | 240篇 |
基础医学 | 1979篇 |
口腔科学 | 444篇 |
临床医学 | 1890篇 |
内科学 | 2882篇 |
皮肤病学 | 302篇 |
神经病学 | 1127篇 |
特种医学 | 823篇 |
外科学 | 2006篇 |
综合类 | 103篇 |
一般理论 | 2篇 |
预防医学 | 1229篇 |
眼科学 | 253篇 |
药学 | 930篇 |
1篇 | |
中国医学 | 34篇 |
肿瘤学 | 935篇 |
出版年
2023年 | 86篇 |
2022年 | 95篇 |
2021年 | 224篇 |
2020年 | 160篇 |
2019年 | 223篇 |
2018年 | 292篇 |
2017年 | 263篇 |
2016年 | 254篇 |
2015年 | 240篇 |
2014年 | 365篇 |
2013年 | 540篇 |
2012年 | 710篇 |
2011年 | 764篇 |
2010年 | 395篇 |
2009年 | 370篇 |
2008年 | 628篇 |
2007年 | 724篇 |
2006年 | 602篇 |
2005年 | 535篇 |
2004年 | 510篇 |
2003年 | 448篇 |
2002年 | 435篇 |
2001年 | 376篇 |
2000年 | 456篇 |
1999年 | 395篇 |
1998年 | 238篇 |
1997年 | 198篇 |
1996年 | 182篇 |
1995年 | 183篇 |
1994年 | 154篇 |
1993年 | 150篇 |
1992年 | 326篇 |
1991年 | 342篇 |
1990年 | 333篇 |
1989年 | 309篇 |
1988年 | 276篇 |
1987年 | 311篇 |
1986年 | 287篇 |
1985年 | 229篇 |
1984年 | 225篇 |
1983年 | 192篇 |
1982年 | 126篇 |
1981年 | 94篇 |
1980年 | 78篇 |
1979年 | 129篇 |
1978年 | 92篇 |
1977年 | 95篇 |
1976年 | 93篇 |
1975年 | 89篇 |
1973年 | 81篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
91.
92.
93.
94.
95.
96.
How health–disease is perceived or conceptualized is important for nursing research There is increasing evidence that individual representations are important in constructing the experience of health–disease What is the personal saliency of health–disease for the individual? To explore the patterns of meaning inherent in health–disease, a card sort was undertaken among 15 healthy individuals and 15 individuals with chronic renal disease Both groups were given 28 cards to sort twice once for when they felt ‘well’ and again for when they felt ‘ill’ The theoretical basis underlying the items of the card sort was a model of wellness-illness being developed Latent partition analysis was used to cluster the concepts from each data set followed by multi-dimensional scaling to analyse the structure of the intercategory probability estimates A possible unidimensional pattern of meaning (harmony) emerged for the ‘well’ data and a two-dimensional pattern (disharmony and optimism) for the ‘ill’ data This represents a preliminary step in the development of a theoretical model that would permit assessment of the meaning of health–disease for the individual 相似文献
97.
The patellofemoral joint was imaged with magnetic resonance (MR) in the axial plane while the knee was positioned from 0 degrees to 32 degrees of flexion (nine positions). These multiple sequential images obtained within the early phases of flexion of the knee were viewed in a "cine-loop" format, producing a kinematic study that clearly demonstrated the relationship of the patella to the trochlear groove. Four healthy subjects and one patient with known bilateral subluxing patellae were studied. The preliminary results suggest that kinematic MR imaging of the patellofemoral joint is potentially useful for the evaluation of patellar tracking abnormalities. 相似文献
98.
Human adenoids and tonsils were disintegrated mechanically and the cells dispersed by passage through a stainless-steel screen in EDTA-containing buffer. Collagenase digestion did not increase the yield of adenoidal cells. The mast cell content of the cell suspensions was in the range of 1–10 mast cells/104 cells with an estimated mean of 1–2 mast cells/104 cells, a value considerably below previous reports on adenoidal cell suspensions. The mast cell content was determined by staining with toluidine blue at low pH (to prevent interference by phagocytes). The mast cell count as assessed by alcian blue staining and by fluorescence microscopy after FITC-anti-human IgE binding was similar. Various attempts to enrich the cell suspension (i.e. by differential centrifugation, by gradient centrifugation on Ficoll or Ficoll-Hypaque and by velocity sedimentation at unit gravity) all gave negative results. 相似文献
99.
Owens EB Hinshaw SP Kraemer HC Arnold LE Abikoff HB Cantwell DP Conners CK Elliott G Greenhill LL Hechtman L Hoza B Jensen PS March JS Newcorn JH Pelham WE Severe JB Swanson JM Vitiello B Wells KC Wigal T 《Journal of consulting and clinical psychology》2003,71(3):540-552
Using receiver operating characteristics, the authors examined outcome predictors (variables associated with outcome regardless of treatment) and moderators (variables identifying subgroups with differential treatment effectiveness) in the Multimodal Treatment Study of Children with Attention-Deficit/Hyperactivity Disorder (ADHD; MTA). Treatment response was determined using parent- and teacher-reported ADHD and oppositional defiant symptoms, with levels near or within the normal range indicating excellent response. Among 9 baseline child and family characteristics, none predicted but 3 moderated treatment response. In medication management and combined treatments, parental depressive symptoms and severity of child ADHD were associated with decreased rates of excellent response; when these 2 characteristics were present, below-average child IQ was an additional moderator. No predictors or moderators emerged for behavioral and community comparison treatments. The authors discuss conceptual and clinical implications of research on treatment moderators. 相似文献
100.
Mannering SI Dromey JA Morris JS Thearle DJ Jensen KP Harrison LC 《Journal of immunological methods》2005,298(1-2):83-92
T-cell clones are valuable tools for investigating T-cell specificity in infectious, autoimmune and malignant diseases. T cells specific for clinically-relevant autoantigens are difficult to clone using traditional methods. Here we describe an efficient method for cloning human autoantigen-specific CD4+ T cells pre-labelled with CFSE. Proliferating, antigen-responsive CD4+ cells were identified flow cytometrically by their reduction in CFSE staining and single cells were sorted into separate wells. The conditions (cytokines, mitogens and tissue culture plates) for raising T-cell clones were optimised. Media supplemented with IL-2+IL-4 supported growth of the largest number of antigen-specific clones. Three mitogens, PHA, anti-CD3 and anti-CD3+anti-CD28, each stimulated the growth of similar numbers of antigen-specific clones. Cloning efficiency was similar in flat- and round-bottom plates. Based on these findings, IL-2+IL-4, anti-CD3 and round-bottom plates were used to clone FACS-sorted autoantigen-specific CFSE-labelled CD4+ T cells. Sixty proinsulin- and 47 glutamic acid decarboxylase-specific clones were obtained from six and two donors, respectively. In conclusion, the CFSE-based method is ideal for cloning rare, autoantigen-specific, human CD4+ T cells. 相似文献