全文获取类型
收费全文 | 29310篇 |
免费 | 1649篇 |
国内免费 | 132篇 |
专业分类
耳鼻咽喉 | 382篇 |
儿科学 | 710篇 |
妇产科学 | 491篇 |
基础医学 | 3781篇 |
口腔科学 | 1015篇 |
临床医学 | 2147篇 |
内科学 | 7616篇 |
皮肤病学 | 618篇 |
神经病学 | 2364篇 |
特种医学 | 558篇 |
外科学 | 4463篇 |
综合类 | 189篇 |
现状与发展 | 1篇 |
一般理论 | 13篇 |
预防医学 | 2460篇 |
眼科学 | 660篇 |
药学 | 1755篇 |
1篇 | |
中国医学 | 89篇 |
肿瘤学 | 1778篇 |
出版年
2023年 | 184篇 |
2022年 | 498篇 |
2021年 | 985篇 |
2020年 | 516篇 |
2019年 | 915篇 |
2018年 | 1065篇 |
2017年 | 633篇 |
2016年 | 690篇 |
2015年 | 834篇 |
2014年 | 1053篇 |
2013年 | 1330篇 |
2012年 | 2161篇 |
2011年 | 2288篇 |
2010年 | 1244篇 |
2009年 | 1154篇 |
2008年 | 1822篇 |
2007年 | 1876篇 |
2006年 | 1795篇 |
2005年 | 1652篇 |
2004年 | 1468篇 |
2003年 | 1276篇 |
2002年 | 1170篇 |
2001年 | 444篇 |
2000年 | 494篇 |
1999年 | 429篇 |
1998年 | 229篇 |
1997年 | 187篇 |
1996年 | 140篇 |
1995年 | 132篇 |
1994年 | 141篇 |
1993年 | 107篇 |
1992年 | 203篇 |
1991年 | 211篇 |
1990年 | 180篇 |
1989年 | 147篇 |
1988年 | 120篇 |
1987年 | 118篇 |
1986年 | 116篇 |
1985年 | 117篇 |
1984年 | 84篇 |
1983年 | 61篇 |
1982年 | 61篇 |
1981年 | 54篇 |
1980年 | 49篇 |
1979年 | 64篇 |
1978年 | 70篇 |
1977年 | 43篇 |
1975年 | 59篇 |
1974年 | 81篇 |
1973年 | 52篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
41.
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
42.
43.
Aneurisma de aorta abdominal infrarrenal en asociación con riñón en herradura: aportación de un caso
Nerea Senarriaga Ruiz de la Illa Reyes Vega Manrique Isabel Lacasa Viscasillas Iñaki Iriarte Soldevilla Miguel Unda Urzaiz 《Actas urologicas espa?olas》2009,33(10):1141-1144
We review the association between surgically resolvable aortic disease and horseshoe kidney with a discussion of diagnostic problems and therapeutic options.Male patient 81 years of age with horseshoe kidney and an abdominal aortic aneurysm that was discovered by chance in an abdominal ultrasound during a check-up for his prostate condition.A retroperitoneal approach was used in order to resect the aneurysm and perform an aorto-aortic bypass with no complications occurring. Two years after the diagnosis, the patient is still asymptomatic from a vascular point of view.The co-presence of horseshoe kidney and aortic disease needing surgical correction is infrequent, but it significantly increases the technical complexity of aortic reconstruction. A literature review is included. 相似文献
44.
45.
D H Char J R Castro J M Quivey T L Phillips A R Irvine R D Stone S Kroll 《Ophthalmology》1989,96(12):1708-1715
The optimum radiation therapy for uveal melanoma is uncertain. Both helium ion irradiation and 125I brachytherapy have been used to treat this neoplasm. This investigation analyzed the control and complication rates of uveal melanomas treated with helium ions of 125I plaques. In both a retrospective and a prospective dynamically balanced study, the control rates appeared to be similar. There were more posterior segment complications after 125I plaques and more anterior segment complications, including neovascular glaucoma, after helium ion irradiation. The follow-up period is too short to draw definitive conclusions on the radiation complications. Overall, approximately 89% of eyes were retained and less than 4% of treated eyes were removed because of failure to control the tumor. 相似文献
46.
47.
48.
The aim was to determine whether the immunogenicity of an investigational hepatitis B vaccine (spHB) is at least as high as that of a licensed control vaccine, Engerix B®, and to evaluate its safety before inclusion in new pediatric combination vaccines. Two randomized, controlled, blind-observer, Phase 3 trials were performed: one in Argentina (344 participants aged 10–15 years, 10 μg HBsAg/dose) and one in Uruguay (344 participants aged 16–45 years, 20 μg HBsAg/dose). Both vaccines were given in a 0, 1, 6 month schedule to all participants with a baseline anti-Hep B antibody titer <0.6 mIU/mL. Antibody titers were measured pre-dose 1, 1 month after dose 2, pre-dose 3, and 1 month after dose 3. Statistical non-inferiority analyses were performed on seroprotection rates (SP) post-dose 3 (% with anti-Hep B titers ≥10 mIU/mL; delta non-inferiority limit of −10%). In both studies, SP for the spHB vaccine was 100% and the spHB vaccine was non-inferior in terms of SP to the licensed control vaccine. GMTs post-dose 3 were approximately 1.8- and 4.1-fold higher for spHB in the 10–15 year and 16–45 year age groups, respectively. Reactogenicity was low for each vaccine, after each dose. This highly immunogenic hepatitis B candidate vaccine was selected for further investigation as a component of new pediatric combination vaccines. 相似文献
49.
Amalia Moreno Concepción Montón Yolanda Belmonte Miguel Gallego Xavier Pomares Jordi Real 《Archivos de bronconeumologia》2009,45(4):181-185
ObjectiveThe objective of this study was to assess the causes of death and risk factors for mortality in a cohort of patients with severe chronic obstructive pulmonary disease (COPD).Patients and methodsWe studied 203 patients with severe COPD (forced expiratory volume in 1 second [FEV1] <50%), who were attended in our respiratory department day hospital (2001-2006). Clinical variables were recorded on inclusion, and clinical course and causes of death were retrospectively reviewed.ResultsThe mean (SD) age of patients was 69 (8) years and the mean FEV1 was 30.8% (8.2%). One-hundred and nine patients died (53.7%); death was attributed to respiratory causes in 72 (80.9%), with COPD exacerbation being the most frequent specific cause within this category (48.3%). During follow-up, 18.7% required admission to the intensive care unit (ICU). Survival at 1, 3, and 5 years was 80%, 53%, and 26%, respectively. The multivariate analysis showed that mortality was associated with age, stage IV classification according to the Global Initiative for Chronic Obstructive Lung Disease (GOLD), cor pulmonale, and hospital admission during the year prior to inclusion. Need for admission to the ICU during follow-up was a factor independently associated with higher mortality.ConclusionsMortality in patients with severe COPD was high and exacerbation of the disease was one of the most frequent causes of death. Age, GOLD stage, cor pulmonale, prior admission to hospital, and need for admission to the ICU during follow-up were independent predictors of mortality. 相似文献
50.
Generoso Gómez Cruz Miguel Barrueco Ferrero Irene Aparicio Coca José Ángel Maderuelo Miguel Torrecilla García 《Archivos de bronconeumologia》2009,45(1):16-23
Background and ObjectiveSchool smoking prevention programs have never yielded the expected results. The aim of this study was to analyze the efficacy of an intensive smoking prevention program created by the educational community in which it was to be applied.Population and MethodA 3-year smoking prevention program was carried out among the students of Fuentesaúco Secondary School in Zamora, Spain. The Babilafuente Secondary School in Salamanca, Spain was the control group. The program included both prevention and treatment activities. The former were carried out in the school, in out-of-school situations, and in the community. The questionnaire of the European Smoking Prevention Framework Approach was used.ResultsA total of 417 students aged 12 to 17 years participated in the study. Of these, 54.4% belonged to the intervention group and 45.6% to the control group. Smokers represented 36.7% of the population. After the intervention smokers represented 40.1% of the Fuentesaúco students compared with 46.1% of the Babilafuente students, though the difference was not statistically significant. With respect to the cognitive determinants of smoking behavior, after the intervention significant differences in favor of the intervention group were only observed in the subjects’ perception of the behavior of their siblings, peers, and teachers.ConclusionsThe use of smoking prevention programs in schools should be reconsidered, and their evaluation should be based on educational rather than clinical criteria. Proposed changes in the program include decreasing its intensity, starting with students of an earlier age and seeking greater involvement of parents. 相似文献