全文获取类型
收费全文 | 3080篇 |
免费 | 395篇 |
国内免费 | 8篇 |
专业分类
耳鼻咽喉 | 38篇 |
儿科学 | 81篇 |
妇产科学 | 25篇 |
基础医学 | 332篇 |
口腔科学 | 45篇 |
临床医学 | 423篇 |
内科学 | 581篇 |
皮肤病学 | 46篇 |
神经病学 | 250篇 |
特种医学 | 266篇 |
外科学 | 497篇 |
综合类 | 38篇 |
预防医学 | 380篇 |
眼科学 | 28篇 |
药学 | 162篇 |
中国医学 | 9篇 |
肿瘤学 | 282篇 |
出版年
2023年 | 48篇 |
2022年 | 22篇 |
2021年 | 51篇 |
2020年 | 59篇 |
2019年 | 52篇 |
2018年 | 119篇 |
2017年 | 91篇 |
2016年 | 92篇 |
2015年 | 113篇 |
2014年 | 127篇 |
2013年 | 153篇 |
2012年 | 149篇 |
2011年 | 176篇 |
2010年 | 116篇 |
2009年 | 109篇 |
2008年 | 122篇 |
2007年 | 122篇 |
2006年 | 131篇 |
2005年 | 119篇 |
2004年 | 111篇 |
2003年 | 104篇 |
2002年 | 109篇 |
2001年 | 71篇 |
2000年 | 87篇 |
1999年 | 65篇 |
1998年 | 27篇 |
1997年 | 35篇 |
1996年 | 26篇 |
1995年 | 25篇 |
1994年 | 42篇 |
1993年 | 29篇 |
1992年 | 44篇 |
1991年 | 67篇 |
1990年 | 44篇 |
1989年 | 58篇 |
1988年 | 42篇 |
1987年 | 50篇 |
1986年 | 35篇 |
1985年 | 27篇 |
1984年 | 36篇 |
1983年 | 32篇 |
1981年 | 19篇 |
1979年 | 35篇 |
1978年 | 33篇 |
1977年 | 27篇 |
1976年 | 27篇 |
1975年 | 17篇 |
1973年 | 21篇 |
1972年 | 20篇 |
1969年 | 20篇 |
排序方式: 共有3483条查询结果,搜索用时 31 毫秒
1.
Well‐being,health and fitness of children who use wheelchairs: Feasibility study protocol to develop child‐centred ‘keep‐fit’ exercise interventions 下载免费PDF全文
2.
Anders Elm Pedersen Esben Gjerløff Wedebye Schmidt Jesper Freddie Sørensen Carsten Faber Boye Schnack Nielsen Kim Holmstrøm Silje Haukali Omland Peter Tougaard Søren Skov Bo Bang 《APMIS : acta pathologica, microbiologica, et immunologica Scandinavica》2015,123(7):547-555
TL1A is a TNF‐like cytokine which has been shown to co‐stimulate TH1 and TH17 responses during chronic inflammation. The expression of this novel cytokine has been investigated in inflammatory disorders like rheumatoid arthritis and inflammatory bowel disease, but little is known about expression and induction in psoriasis. Indeed, the pathogenesis in psoriasis is still not fully understood and it is speculated that cytokines other than TNF‐α are important in subsets of patients. Also, for patients with severe disease that are treated with systemic anti‐TNF‐α blockade, novel candidates to be used as disease and response biomarkers are of high interest. Here, we demonstrate TL1A expression in biopsies from psoriatic lesions. Also, we investigated spontaneous and induced TL1A secretion from PBMCs and blood levels from a cohort of psoriasis patients. Here, increased spontaneous secretion from PBMCs was observed as compared to healthy controls and a small subset of patients had highly elevated TL1A in the blood. Interestingly, activation of PBMCs with various cytokines showed a decreased sensitivity for TL1A activation in psoriasis patients compared to healthy controls.TL1A levels in blood and biopsies could not be correlated with disease activity with this patient cohort. Thus, additional large‐scale studies are warranted to investigate TL1A as a biomarker. 相似文献
3.
The initial management of bladder outflow obstruction typically related to benign prostatic hyperplasia (BPH) falls to a large extent within the remit of general practice. Referral onwards to secondary care typically arises following the failure to respond to conservative measures or when complications have supervened; the most significant of which is urinary retention. In the hospital setting, anaesthesia, constipation and immobility are the common precipitants. What follows is a practical guide to the management of these situations and provides an overview of the conservative, medical, minimally invasive and surgical treatments available. 相似文献
4.
Transplanting the Highly Sensitized Patient: The Emory Algorithm 总被引:4,自引:0,他引:4
R. A. Bray J. D. L. Nolen C. Larsen T. Pearson K. A. Newell K. Kokko A. Guasch P. Tso J. B. Mendel H. M. Gebel 《American journal of transplantation》2006,6(10):2307-2315
Renal transplant patients sensitized to HLA antigens comprise nearly one-third of the UNOS wait-list and receive 14% of deceased donor (DD) transplants, a rate half that of unsensitized patients. Between 1999 and 2003, we performed 492 adult renal transplants from DD; 120 patients (approximately 25%) had a panel reactive antibody (PRA) of >30%, with nearly half (n = 58) having a PRA of >80%. Our approach is based upon high-resolution solid-phase HLA antibody analysis to identify class I/II antibodies and a 'virtual crossmatch' to predict compatible donor/recipient combinations. Recipients are excluded from the United Network for Organ Sharing match run if donors possess unacceptable antigens. Thus, when sensitized patients appear on the match run, they have a high probability of a negative final crossmatch. Here, we describe our 5-year experience with this approach. Five-year graft survival ranged from 66% to 70% among unsensitized (n = 272), moderately sensitized (PRA < 30%, n = 100) and highly sensitized (>30% PRA; n = 120) patients, equal to the average national graft survival (65.7%). The application of this approach (the Emory Algorithm) provides a logical and systematic approach to improve the access of sensitized patients to DD organs and promote more equitable allocation to a highly disadvantaged group of patients awaiting renal transplantation. 相似文献
5.
Williamson Kathleen A.; Hever Ann M.; Rainger Joe; Rogers R. Curtis; Magee Alex; Fiedler Zdenek; Keng Wee Teik; Sharkey Freddie H.; McGill Niolette; Hill Clare J.; Schneider Adele; Messina Mario; Turnpenny Peter D.; Fantes Judy A.; van Heyningen Veronica; FitzPatrick David R. 《Human molecular genetics》2006,15(12):2030
Table 1 相似文献
6.
An ecologically based examination of barriers to physical activity in students from grade seven through first-year university 总被引:1,自引:0,他引:1
Nancy C. Gyurcsik Ph.D. Kevin S. Spink Ph.D. Steven R. Bray Ph.D. Karen Chad Ph.D. Matt Kwan B.Sc. 《The Journal of adolescent health》2006,38(6):704-711
PurposeThe first purpose was to identify barriers to physical activity that students in grade seven through first-year university experienced. A second purpose was to classify barriers using an ecological framework and to examine the pattern of barrier categories (i.e., intrapersonal, interpersonal, institutional, community, public policy, and physical environmental) and specific barrier types as grade increased. The use of an ecological model addressed limitations in prior research revolving around the identification of salient barriers in a manner that makes the design of effective interventions difficult.MethodsParticipants in grades 7–8 (n = 35), 9–10 (n = 67), 11–12 (n = 80), and the freshmen year of university (n = 109) listed barriers to physical activity on an open-ended measure.ResultsFindings revealed a trend for the average number of barriers reported per student to increase as grade in school increased. First-year university students reported significantly more barriers than all other grade groupings. The frequency of barriers reported within the ecological categories was dependent on the specific grade groupings. Further, within each ecological category, distinct barriers were reported across the different grade groupings.ConclusionsFindings highlight the utility of using an ecological model to categorize barriers, rather than simply classifying barriers as internal or external to an individual, as done in prior research. Understanding the pattern of ecologically based barrier categories and specific types of barriers will help to inform the content of future research and interventions designed to alleviate salient barriers to physical activity. 相似文献
7.
R Litzenberger K M Morgan S F Marden K N Jacobs-Irvine S A Bray 《The Journal of cardiovascular nursing》1991,5(2):58-66
This case study illustrates the chronic nature of hyperlipidemia type IIa and the important contribution of the nurse in helping the client adjust life style, manage complex health regimes, and cope with the uncertainty of disease progression and its associated risks. 相似文献
8.
9.
Deborah Bray Preston Anthony R D'Augelli Cathy D Kassab Richard E Cain Frederick W Schulze Michael T Starks 《AIDS education and prevention》2004,16(4):291-303
Research investigating predictors of risky sexual behavior of rural MSM is sparse, even though the prevalence of HIV in rural areas has increased. This study explored two sets of predictors of 93 rural MSM's levels of risky sexual behavior: mental health variables and stigma emanating from men's family members, health care professionals, and people in the rural communities in which they live. Over 47% of the men were found to be at modified high to high risk. Logistic regression using a continuation logit model was used to test the relationship of the predictor variables and the four levels of risk. Findings indicate that self-esteem was predictive of the highest sexual risk behavior but not lower levels of risk. Stigma was predictive of modified high sexual risk when compared to low and no risk categories. No variables differentiated men at low risk from men at no risk. 相似文献
10.