全文获取类型
收费全文 | 45056篇 |
免费 | 2847篇 |
国内免费 | 257篇 |
专业分类
耳鼻咽喉 | 391篇 |
儿科学 | 1295篇 |
妇产科学 | 1202篇 |
基础医学 | 5972篇 |
口腔科学 | 941篇 |
临床医学 | 4499篇 |
内科学 | 9850篇 |
皮肤病学 | 882篇 |
神经病学 | 4845篇 |
特种医学 | 1498篇 |
外科学 | 5914篇 |
综合类 | 177篇 |
一般理论 | 19篇 |
预防医学 | 3355篇 |
眼科学 | 767篇 |
药学 | 2795篇 |
1篇 | |
中国医学 | 85篇 |
肿瘤学 | 3672篇 |
出版年
2024年 | 70篇 |
2023年 | 522篇 |
2022年 | 998篇 |
2021年 | 1803篇 |
2020年 | 1059篇 |
2019年 | 1486篇 |
2018年 | 1702篇 |
2017年 | 1191篇 |
2016年 | 1338篇 |
2015年 | 1546篇 |
2014年 | 2121篇 |
2013年 | 2646篇 |
2012年 | 3931篇 |
2011年 | 3908篇 |
2010年 | 1979篇 |
2009年 | 1849篇 |
2008年 | 3122篇 |
2007年 | 3010篇 |
2006年 | 2709篇 |
2005年 | 2680篇 |
2004年 | 2238篇 |
2003年 | 2000篇 |
2002年 | 1770篇 |
2001年 | 228篇 |
2000年 | 163篇 |
1999年 | 231篇 |
1998年 | 303篇 |
1997年 | 224篇 |
1996年 | 200篇 |
1995年 | 180篇 |
1994年 | 155篇 |
1993年 | 121篇 |
1992年 | 84篇 |
1991年 | 77篇 |
1990年 | 63篇 |
1989年 | 43篇 |
1988年 | 45篇 |
1987年 | 45篇 |
1986年 | 42篇 |
1985年 | 39篇 |
1984年 | 41篇 |
1983年 | 23篇 |
1982年 | 40篇 |
1981年 | 24篇 |
1980年 | 25篇 |
1979年 | 9篇 |
1978年 | 15篇 |
1977年 | 14篇 |
1976年 | 8篇 |
1972年 | 10篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
11.
Martín-Nares Eduardo Zuñiga-Tamayo Diego Hinojosa-Azaola Andrea 《Clinical rheumatology》2019,38(1):97-106
Clinical Rheumatology - We aimed to estimate the frequency of overlap of antineutrophil cytoplasmic antibody (ANCA)-associated vasculitis (AAV) with systemic autoimmune diseases. Retrospective... 相似文献
12.
13.
Devagi Kanakaraju Nurfatyha Rusydah bt Mohamad Shahdad Ying-Chin Lim Andrea Pace 《Sustainable Chemistry and Pharmacy》2019
The use of multifunctional materials for water remediation is a modern approach where adsorption phenomena and heterogeneous photocatalysis can be applied for the removal of pollutants. Since the ideal remediation system should be able to remove both organic and inorganic pollutants, a crucial aspect to consider is the knowledge of operational parameters affecting the removal process, especially when heavy metal ions are present in concoction as in real systems. Given the proven efficiency of multifunctional TiO2/Alg/FeNPs magnetic beads for the removal of model organic pollutants, this study investigated the possibility to exploit such system also for the removal of mixed heavy metals (MHM), specifically Cr(III), Cu(II), and Pb(II) ions, under ultraviolet irradiation at a wavelength of 254 nm. After a preliminary screening on the optimal catalyst loading, operating parameters such as the initial concentration of metal ions, contact and irradiation time, and pH were investigated to optimize the removal of metal ions using response surface methodology (RSM) via Box–Behnken design. Starting from a MHM solution containing 44 ppm of each metal ion, the removal of Pb(II), Cr(III), and Cu(II) ions in the aqueous solution was nearly completed (>98.4%) for all three ions within 72 min of irradiation at almost neutral pH (pH = 6.8). The stability of TiO2/Alg/FeNPs was confirmed by retrieving and reusing the beads in three consecutive cycles of heavy metals removal without observing significant changes in catalyst efficiency. 相似文献
14.
15.
16.
Sebastian Mondaca Walid K. Chatila David Bates Jaclyn F. Hechtman Andrea Cercek Neil H. Segal Zsofia K. Stadler Anna M. Varghese Ritika Kundra Marinela Capanu Jinru Shia Nikolaus Schultz Leonard Saltz Rona Yaeger 《Clinical colorectal cancer》2019,18(1):e39-e52
Background
Treatment of advanced anal squamous cell cancer (SCC) is usually with the combination of cisplatin and 5-fluorouracil, which is associated with heterogeneous responses across patients and significant toxicity. We examined the safety and efficacy of a modified schedule, FOLFCIS (leucovorin, fluorouracil, and cisplatin), and performed an integrated clinical and genomic analysis of anal SCC.Patients and Methods
We reviewed all patients with advanced anal SCC receiving first-line FOLFCIS chemotherapy – essentially a FOLFOX (leucovorin, fluorouracil, and oxaliplatin) schedule with cisplatin substituted for oxaliplatin – in our institution between 2007 and 2017, and performed deep sequencing to identify genomic markers of response and key genomic drivers.Results
Fifty-three patients with advanced anal SCC (48 metastatic; 5 unresectable, locally advanced) received first-line FOLFCIS during this period; all were platinum-naive. The response rate was 48% (95% confidence interval [CI], 32.6%-63%). With a median follow-up of 41.6 months, progression-free survival and overall survival were 7.1 months (95% CI, 4.4-8.6 months) and 22.1 months (95% CI, 16.9-28.1 months), respectively. Among all patients with advanced anal SCC that underwent sequencing during the study period, the most frequent genomic alterations consisted of chromosome 3q amplification (51%) and mutations in PIK3CA (29%) and KMT2D (22%). No genomic alteration correlated with response to platinum-containing treatment. Although there were few cases, patients with human papillomavirus-negative anal SCC did not appear to benefit from FOLFCIS, and all harbored distinct genomic profiles with TP53, TERT promoter, and CDKN2A mutations.Conclusions
FOLFCIS appears effective and safe as first-line chemotherapy in patients with advanced anal SCC and represents an alternative treatment option for these patients. 相似文献17.
Psychological characteristics and physiological reactivity to acute stress in mothers of children with autism spectrum disorder 总被引:1,自引:0,他引:1
Elena Pattini Luca Carnevali Alfonso Troisi Guido Matrella Dolores Rollo Mauro Fornari Andrea Sgoifo 《Stress and health》2019,35(4):421-431
Stress related to parenting a child with autism spectrum disorder can differently affect caregiver's physiological reactivity to acute stress. Here, parental stress levels, psychological characteristics, and coping strategies were assessed alongside measures of heart rate, heart rate variability, and cortisol during a psychosocial stress test in mothers of children with ASD (M‐ASD, n = 15) and mothers of typically developing children (n = 15). M‐ASD reported significantly higher levels of parental stress, anxiety, negative affectivity, social inhibition, and a larger preference for avoidance strategies. M‐ASD showed larger heart rate and cortisol responses to the psychosocial stress test. A positive relationship was found between parental stress levels and the magnitude of the cortisol stress response in both groups. The present findings indicate exaggerated physiological reactivity to acute psychosocial stress in M‐ASD and prompt further research to explore the role of individual differences in mediating the effects of parental stress on physiological stress responses. 相似文献
18.
Rocco Spagnuolo Alessandro Corea Mariantonietta Blumetti Alessia Giovinazzo Massimiliano Serafino Caterina Pagliuso Raffaele Pagnotta Grazia Curto Cristina Cosco Vincenzo Cosco Rosellina Margherita Mancina Pietro Garieri Anna Papaleo Laura Grande Anna Barilaro Eugenio Garofalo Andrea Bruni Patrizia Doldo 《Journal of advanced nursing》2020,76(11):2993-3002
19.
20.