全文获取类型
收费全文 | 2016篇 |
免费 | 94篇 |
国内免费 | 7篇 |
专业分类
耳鼻咽喉 | 15篇 |
儿科学 | 140篇 |
妇产科学 | 83篇 |
基础医学 | 257篇 |
口腔科学 | 27篇 |
临床医学 | 159篇 |
内科学 | 400篇 |
皮肤病学 | 29篇 |
神经病学 | 105篇 |
特种医学 | 67篇 |
外科学 | 168篇 |
综合类 | 30篇 |
预防医学 | 203篇 |
眼科学 | 176篇 |
药学 | 124篇 |
中国医学 | 8篇 |
肿瘤学 | 126篇 |
出版年
2023年 | 4篇 |
2022年 | 26篇 |
2021年 | 54篇 |
2020年 | 30篇 |
2019年 | 39篇 |
2018年 | 48篇 |
2017年 | 37篇 |
2016年 | 55篇 |
2015年 | 53篇 |
2014年 | 74篇 |
2013年 | 91篇 |
2012年 | 166篇 |
2011年 | 192篇 |
2010年 | 111篇 |
2009年 | 88篇 |
2008年 | 136篇 |
2007年 | 136篇 |
2006年 | 115篇 |
2005年 | 115篇 |
2004年 | 124篇 |
2003年 | 89篇 |
2002年 | 106篇 |
2001年 | 11篇 |
2000年 | 17篇 |
1999年 | 13篇 |
1998年 | 19篇 |
1997年 | 12篇 |
1996年 | 12篇 |
1995年 | 4篇 |
1994年 | 8篇 |
1993年 | 9篇 |
1992年 | 10篇 |
1991年 | 11篇 |
1990年 | 9篇 |
1989年 | 7篇 |
1988年 | 6篇 |
1987年 | 6篇 |
1986年 | 4篇 |
1985年 | 6篇 |
1984年 | 4篇 |
1983年 | 4篇 |
1982年 | 6篇 |
1981年 | 6篇 |
1980年 | 7篇 |
1979年 | 8篇 |
1978年 | 5篇 |
1976年 | 5篇 |
1974年 | 6篇 |
1971年 | 2篇 |
1962年 | 2篇 |
排序方式: 共有2117条查询结果,搜索用时 421 毫秒
31.
G. K. Maheshwari H. A. Baboo Usha Gopal M. K. Wadhwa 《Indian journal of otolaryngology and head and neck surgery》2004,56(2):138-141
Sarcomas constitute fewer than 1% of the head and neck cancers. They represent less than 1% of laryngeal cancers. Primary
rhabdomyosarcoma of the larynx is an extremely rare malignancy. The available literature on this medical oddity is in the
form of isolated case reports only. The purpose of this article is to add another case of primary rhabdomyosarcoma of a rare
site, the larynx, of which only 36 cases have so far been reported in the world literature. The present patient, an eighteen-year-old
boy is only the third case being reported from India among all reported cases of rhabdomyosarcoma of the larynx in the world
literature. 相似文献
32.
Usha Stiefel Nicole J Pultz Marion S Helfand Curtis J Donskey 《Infection control and hospital epidemiology》2004,25(5):373-379
BACKGROUND: Antibiotic-associated disruption of the indigenous intestinal microflora may persist beyond the treatment period. Although piperacillin/tazobactam inhibits the establishment of vancomycin-resistant Enterococcus (VRE) stool colonization in mice during treatment, we hypothesized that this agent and other anti-anaerobic antibiotics would increase susceptibility to colonization during the period of recovery of the intestinal microflora. DESIGN: Mice received 10(4) colony-forming units of vancomycin-resistant E. faecium by orogastric inoculation 2, 5, or 10 days after completing 5 days of subcutaneous antibiotic treatment, or both during and 2 days after the completion of treatment. Denaturing gradient gel electrophoresis (DGGE) was performed to assess changes in the intestinal microflora. RESULTS: Anti-anaerobic antibiotics (ie, piperacillin/ tazobactam, cefoxitin, and clindamycin) caused significant disruption of the indigenous microflora (mean DGGE similarity indices < or = 27% in comparison with saline controls) and promoted the establishment of high-density colonization when VRE was inoculated 2 or 5, but not 10, days following treatment (P < .001). Piperacillin/tazobactam exhibited a biphasic effect on the establishment of colonization (ie, inhibition when exposed to VRE during treatment and promotion when exposed to VRE after discontinuation of treatment), resulting in greater overall promotion of colonization than did agents with minimal anti-anaerobic activity (ie, levofloxacin, cefepime, and aztreonam) when VRE was inoculated both during and 2 days after treatment (P < .001). CONCLUSION: Patients receiving anti-anaerobic antibiotics, including piperacillin/tazobactam, may be susceptible to the establishment of high-density VRE colonization during the period of recovery of the anaerobic microflora. 相似文献
33.
34.
35.
Sukhdeep Bains N. Vidhya Usha Kim R. Shanti J. Devanand 《Orbit (Amsterdam, Netherlands)》2015,34(6):338-339
Secondary cutaneous dissemination from an orbital diffuse large B cell lymphoma has not been described before. The authors report an unusual case of anaplastic variant of diffuse large B cell lymphoma which primarily presented in the orbit and during the course of disease had subcutaneous dissemination. 相似文献
36.
37.
The aim of this study was to evaluate the association of obsessive beliefs, obsessive–compulsive disorder severity and metacognitive beliefs to the quality of life in patients with obsessive–compulsive disorder (OCD). Sixty one adults with a principal diagnosis of OCD were recruited for the study. Participants were assessed by trained clinicians using an unstructured clinical interview, the Obsessive Beliefs Questionnaire, the Yale–Brown Obsessive–Compulsive Scale, the Metacognitive Beliefs Questionnaire and the WHO Quality of Life Questionnaire. Data were analyzed using Pearson's of correlation coefficients and multiple regression analyses. Findings indicate that obsessive beliefs, severity total OCD and metacognitive beliefs were associated with total quality of life scores. Regression analysis revealed that while OCD total severity explained 40.1% of the variance in total quality of life, obsessive beliefs (perfectionism/certainty domain) and metacognitions (cognitive self-consciousness and negative beliefs about thoughts in general) explained an additional 13.7%, 7.7% and 5.4% of the variance in QoL. Findings indicate that the metacognitive beliefs associated with OCD symptom severity are different from that associated with quality of life. The implications are that metacognitive therapy aimed at symptom reduction may not necessarily result in improved QoL in OCD patients. 相似文献
38.
39.
Sai Krishna C Bhan A Sharma S Kiran U Venugopal P 《Texas Heart Institute journal / from the Texas Heart Institute of St. Luke's Episcopal Hospital, Texas Children's Hospital》2005,32(2):147-150
We reviewed our 3-year experience in treating interruption of the aorta in adult patients. Clinical profiles, surgical management, and results of early and mid-term follow-up are presented. From August 2001 through June 2003, 7 adult patients underwent an extra-anatomic bypass procedure to repair interruption of the aortic arch. Five patients underwent ventral aortic repair through a mid-sternotomy and an upper midline laparotomy, and 2 patients underwent repair through a left posterolateral thoracotomy. A bovine collagen-impregnated polyester fiber graft was used in 6 patients, and a Gore-Tex graft was interposed in 1 patient. All repairs were performed without cardiopulmonary bypass. Follow-up was complete in all patients. The mean follow-up was 1728 +/- 1 months (range, 9-31 months). No neurologic, renal, or gastrointestinal complications were noted in any patient. There was no in-hospital or late mortality or need for re-intervention. All patients were asymptomatic; however, 5 patients had mild residual hypertension. Graft patency in all the patients was confirmed by computed tomographic angiography. Interruption of the aorta is rare in adults. Ventral aortic repair through a midline approach is our preferred technique for surgical repair of this entity, because it avoids the extensive network of collateral vessels on the chest wall, enables simultaneous treatment of associated lesions, and in all likelihood reduces morbidity and mortality. 相似文献
40.
Jinu John Ankit Reghuwanshi Usha K. Aravind C.T. Aravindakumar 《Yao wu shi pin fen xi = Journal of food and drug analysis.》2015,23(2):219
An accurate, sensitive, precise, reliable, and quick method for the determination of cholesterol content by high-performance thin layer chromatography is developed. In this method, aluminum-backed precoated silica gel 60 F254 plates were used as the stationary phase and the samples were sprayed with the help of CAMAG sample applicator Linomat 5. The chromatogram was developed with the mobile phase consisting of chloroform:methanol (9.5:0.5, v/v). The samples were detected using CAMAG Scanner 4 and evaluated using the method developed on winCATS software. Densitometric analysis of cholesterol was performed in absorbance mode at 200 nm. In this solvent system, cholesterol gave a compact spot with an Rf value of 0.63 ± 0.03. The linear regression analysis of data for the calibration curve showed good linearity over a concentration range of 2–7 μg/spot with a regression value of 0.99933 and standard deviation of 1.44%. The limit of detection and limit of quantification were found to be 100 ng/spot and 500 ng/spot, respectively. Using the developed method, the concentration of cholesterol in the saponified and unsaponified egg yolk sample was determined. This method was found to be reproducible and can even be used for samples containing complex matrices. 相似文献