全文获取类型
收费全文 | 17368篇 |
免费 | 1418篇 |
国内免费 | 45篇 |
专业分类
耳鼻咽喉 | 191篇 |
儿科学 | 721篇 |
妇产科学 | 307篇 |
基础医学 | 2386篇 |
口腔科学 | 677篇 |
临床医学 | 1528篇 |
内科学 | 4191篇 |
皮肤病学 | 477篇 |
神经病学 | 1386篇 |
特种医学 | 479篇 |
外国民族医学 | 1篇 |
外科学 | 2668篇 |
综合类 | 144篇 |
一般理论 | 20篇 |
预防医学 | 1386篇 |
眼科学 | 242篇 |
药学 | 1023篇 |
中国医学 | 54篇 |
肿瘤学 | 950篇 |
出版年
2023年 | 150篇 |
2022年 | 207篇 |
2021年 | 619篇 |
2020年 | 331篇 |
2019年 | 523篇 |
2018年 | 644篇 |
2017年 | 419篇 |
2016年 | 416篇 |
2015年 | 457篇 |
2014年 | 631篇 |
2013年 | 748篇 |
2012年 | 1106篇 |
2011年 | 1152篇 |
2010年 | 616篇 |
2009年 | 535篇 |
2008年 | 842篇 |
2007年 | 845篇 |
2006年 | 767篇 |
2005年 | 805篇 |
2004年 | 655篇 |
2003年 | 701篇 |
2002年 | 659篇 |
2001年 | 530篇 |
2000年 | 548篇 |
1999年 | 419篇 |
1998年 | 166篇 |
1997年 | 127篇 |
1996年 | 124篇 |
1995年 | 102篇 |
1994年 | 97篇 |
1993年 | 80篇 |
1992年 | 264篇 |
1991年 | 240篇 |
1990年 | 201篇 |
1989年 | 209篇 |
1988年 | 179篇 |
1987年 | 181篇 |
1986年 | 157篇 |
1985年 | 156篇 |
1984年 | 102篇 |
1983年 | 81篇 |
1980年 | 55篇 |
1979年 | 84篇 |
1978年 | 56篇 |
1977年 | 48篇 |
1974年 | 62篇 |
1973年 | 57篇 |
1972年 | 68篇 |
1971年 | 74篇 |
1970年 | 52篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
Primary cutaneous anaplastic large cell lymphomas with 6p25.3 rearrangement exhibit particular histological features 下载免费PDF全文
3.
Francisca Morgado Mariana Batista Ana Moreno Inês Coutinho 《Pediatric dermatology》2021,38(1):191-193
We present a 6‐year‐old girl with skin hyperpigmentation, leukoplakia, and onychodystrophy, the classic mucocutaneous triad usually associated with dyskeratosis congenita. The patient also had premature graying of the hair, bone marrow failure, hepatitis, exudative retinopathy, osteopenia with multiple long bone fractures, and intracranial calcifications and brain cysts. Coats plus syndrome is a rare disease with a clinical and genetic overlap with dyskeratosis congenita. This disease is reviewed, with a focus on the pathogenesis of the genetic anomalies and its background as a telomere biology disorder. 相似文献
4.
Maria Gonzalez-Cao Cristina Carrera Juan Francisco Rodriguez Moreno Pedro Rodríguez-Jiménez Mónica Antoñanzas Basa Rosa Feltes Ochoa Teresa Puertolas Eva Muñoz-Couselo José Luis Manzano Ivan Marquez-Rodas Juan Martín-Liberal Ainara Soria Pilar Lopez Criado Almudena Garcia-Castaño Aram Boada Pablo Ayala de Miguel Susana Puig Guillermo Crespo Alfonso Berrocal 《Journal of the American Academy of Dermatology》2021,84(5):1412-1415
5.
6.
Jorge Cano Julián Campo Luis A Moreno Antonio Bascones 《Oral surgery, oral medicine, oral pathology, oral radiology, and endodontics》2006,101(1):11-28
OBJECTIVE: Alveolar distraction is a relatively novel procedure by which alveolar bone and underlying mucosa are regenerated. The low predictability of other vertical or horizontal bone regeneration methods has increased interest in this promising technique. This article was designed to review published clinical and experimental results on alveolar distraction, including basic research in other disciplines (maxillofacial and orthopedic distraction) related to or with influence on alveolar distraction. STUDY DESIGN: A review of the international literature was performed to summarize results of clinical and experimental studies on alveolar distraction and on distraction at other anatomical sites that contribute important findings on tissue biology, molecular mechanisms, and other factors that influence and participate in the alveolar distraction process. RESULTS: Research into alveolar distraction has addressed the latency phase, distraction phase, and consolidation phase, yielding highly variable results. Little experimental research has been carried out on this procedure, and most publications are clinical studies with a short follow-up period. Published studies have reported a high rate of complications, attributable to our current lack of understanding of the process. CONCLUSIONS: Definitive conclusions on alveolar distraction are hampered by the lack of clinical and experimental studies to date. Greater knowledge of the factors that influence the distraction process will lead to a more predictable and efficacious distraction technique and a better distractor design. 相似文献
7.
Lipid peroxidation, occupational stress and aging in workers of a prehospital emergency service. 总被引:2,自引:0,他引:2
Angela Casado Nieves De Lucas Encarnación López-Fernández Alberto Sánchez José-Antonio Jimenez 《European journal of emergency medicine》2006,13(3):165-171
BACKGROUND: Stressful conditions lead to formation of excessive free radicals, and lipid peroxidation is one of the major outcomes of free radical-mediated injury that directly damages membranes and generates a number of secondary products. OBJECTIVES: To determine the levels of malondialdehyde, an end product of lipid peroxidation, according to demographic and occupational variables in workers of a prehospital emergency service and to analyse the relationship between malondialdehyde levels and burnout. MATERIAL AND METHODS: One hundred and eleven healthy workers of a prehospital emergency service and eighty aged-matched healthy individuals of both sexes as a control group were surveyed. Malondialdehyde levels were measured by the Bull and Marnett method. To measure burnout, the Maslach Burnout Inventory was used. RESULTS: Professional category is associated with lipid peroxidation and burnout levels (Malondialdehyde levels were: physicians 338.10+/-14.47, nurses 329.17+/-12.62 and technicians 296.74+/-14.28; burnout levels were: physicians 41.29+/-3.59, nurses 37.38+/-6.05 and technicians 35.33+/-5.87). Working at night and in the evening increased malondialdehyde and burnout levels. Malondialdehyde levels increase with age. No significant variations with respect to sex were detected. Significant variations in malondialdehyde levels were detected between singles (303.13+/-12.74) and married people (344.43+/-13.43) but not with respect to divorcees (326.44+/-11.74). Significant differences were detected in erythrocyte malondialdehyde levels between smokers (341.37+/-17.09) and nonsmokers (302.21+/-12.38), but not for alcohol consumption. CONCLUSIONS: These findings suggest a positive correlation between malondialdehyde, a biomarker of lipid peroxidation and occupational stress, as estimated by elements of the Maslach Burnout Inventory, and oxidative stress. 相似文献
8.
9.
Antonio S. Salinas Sánchez Jesús Cifuentes Tebar Miguel Segura Martín José M. Giménez Bachs María J. Donate Moreno Héctor Pastor Navarro Julio A. Virseda Rodríguez 《American journal of transplantation》2005,5(8):2074-2077
Ureteral herniation is a rare entity. We report the first case of extraperitoneal ureteral herniation in a pediatric en bloc renal graft causing obstructive uropathy. A 70-year-old, obese patient with an en bloc renal transplant was found to have ureterohydronephrosis in the right renal graft on magnetic resonance imaging. Nephrostomy with insertion of a double-J catheter confirmed the presence of a ureteral loop within the inguinal tract. Surgery confirmed herniation of the ureter through the internal inguinal ring, crossing over the spermatic cord. We performed release, resection, ureteral reimplantation and hernioplasty. Four months later, renal function was normal and urinary tract dilation had diminished. This case illustrates an unusual cause of obstructive uropathy in a transplanted kidney. Apart from obesity, two other factors may have contributed to its development: presence of a redundant ureter, and the fact that the ureter had been placed over, rather than under, the spermatic cord. 相似文献
10.
Two boys born in September 1949 played on uranium mill tailings from about ages 8 to 12. One of these boys was diagnosed as having leukemia at age 15.5. The 226Ra body burden of the survivor was measured at age 38. The whole-body 226Ra content measured by counting in vivo was 0 +/- 17 Bq and independently by Rn breath analysis as 4.3 +/- 2.1 Bq. At the same time, a control subject with no known exposure to 226Ra, matched in age, height, and weight, was also measured. The whole-body content was estimated as 4 +/- 15 Bq and independently by Rn breath analysis as 5.5 +/- 3.7 Bq. The body burden of the control subject was not significantly different from that of the exposed person. The radiation dose to the marrow-free skeleton assuming a constant 226Ra:Ca ratio since birth was 0.49 and 1.33 mGy at ages 14 and 38, respectively. The radiation dose to the marrow-free skeleton assuming 226Ra intake only between ages 8 to 12 was 1.4 and 2.8 mGy at ages 14 and 38, respectively. The best estimate is the mean of these two estimates: 0.9 and 2.1 mGy at ages 14 and 38, respectively. The alpha-particle dose to the red marrow from 226Ra and its decay products was 0.05 mGy at age 14 and 0.10 mGy at age 38. Since no excess was found for the radium dial painters whose doses were much higher, the induction of leukemia by doses of this magnitude would seem quite unlikely. 相似文献