首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   2353512篇
  免费   173327篇
  国内免费   4876篇
耳鼻咽喉   31827篇
儿科学   73376篇
妇产科学   63606篇
基础医学   335160篇
口腔科学   70145篇
临床医学   211006篇
内科学   458499篇
皮肤病学   52323篇
神经病学   183078篇
特种医学   89563篇
外国民族医学   319篇
外科学   362906篇
综合类   52804篇
现状与发展   6篇
一般理论   736篇
预防医学   170783篇
眼科学   56205篇
药学   175788篇
  10篇
中国医学   5970篇
肿瘤学   137605篇
  2019年   17945篇
  2018年   26205篇
  2017年   20073篇
  2016年   22131篇
  2015年   25359篇
  2014年   34863篇
  2013年   50868篇
  2012年   70341篇
  2011年   73957篇
  2010年   43888篇
  2009年   41217篇
  2008年   69522篇
  2007年   73625篇
  2006年   74463篇
  2005年   71153篇
  2004年   68752篇
  2003年   65374篇
  2002年   63290篇
  2001年   125508篇
  2000年   128597篇
  1999年   106601篇
  1998年   27322篇
  1997年   23879篇
  1996年   23980篇
  1995年   22907篇
  1994年   21001篇
  1993年   19431篇
  1992年   80888篇
  1991年   77889篇
  1990年   75030篇
  1989年   72441篇
  1988年   65924篇
  1987年   64311篇
  1986年   60552篇
  1985年   57559篇
  1984年   42016篇
  1983年   35773篇
  1982年   19686篇
  1979年   37286篇
  1978年   25600篇
  1977年   21805篇
  1976年   19973篇
  1975年   21309篇
  1974年   25843篇
  1973年   24741篇
  1972年   23136篇
  1971年   21562篇
  1970年   20239篇
  1969年   18925篇
  1968年   17517篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
92.
93.
94.
The aim of the study was to determine the effect of β-glucan on the cytotoxicity and genotoxicity of polypectomized patient's fecal water (FW). Polypectomized volunteers (n = 69) were randomly assigned to consume bread with or without β-glucan, for 3 months. FW was collected at the beginning (t = 0), the 30th and 90th day and 2 wk after the intervention. Cytotoxicity and genotoxicity were estimated on Caco-2 cells, using trypan blue exclusion test and comet assay, respectively. Gastrointestinal symptoms were recorded and subjects kept a 3-day food diary at baseline and after completion. Trypan blue exclusion test revealed cell survival of approximately 87% after incubation with FW. The FW samples showed 49% genotoxicity at the baseline. Genotoxicity in the intervention group decreased during the trial reaching statistical significance on the 90th day compared to control. An increase was noticed 2 wk after the trial, but it still remained significantly lower compared to control. Group-specific analysis for β-glucan also revealed significant decrease in the genotoxicity on the 90th day compared to baseline. β-glucan ingestion in polypectomized patients significantly decreased the genotoxicity of their FW. Our findings suggest that β-glucan consumption could possibly provide protection against colon cancer development.  相似文献   
95.
European Journal of Orthopaedic Surgery & Traumatology - The goals of this study were to compare patient satisfaction and wound-related complications in patients receiving 2-octyl cyanoacrylate...  相似文献   
96.
97.
Annals of Nuclear Medicine - The Response Evaluation Criteria In Solid Tumors (RECIST) is the most used radiological method for evaluating response after peptide receptor radionuclide therapy...  相似文献   
98.

Purpose

Chest wall pain is an uncommon but bothersome late complication following lung stereotactic body radiation therapy. Despite numerous studies investigating predictors of chest wall pain, no clear consensus has been established for a chest wall constraint. The aim of our study was to investigate factors related to chest wall pain in a homogeneous group of patients treated at our institution.

Patients and methods

All 122 patients were treated with the same stereotactic body radiation therapy regimen of 48 Gy in three fractions, seen for at least 6 months of follow-up, and planned with heterogeneity correction. Chest wall pain was scored according to the Common Terminology Criteria for Adverse Events classification v3.0. Patient (age, sex, diabetes, osteoporosis), tumour (planning target volume, volume of the overlapping region between planning target volume and chest wall) and chest wall dosimetric parameters (volumes receiving at least 30, 40, and 50 Gy, the minimal doses received by the highest irradiated 1, 2, and 5 cm3, and maximum dose) were collected. The correlation between chest wall pain (grade 2 or higher) and the different parameters was evaluated using univariate and multivariate logistic regression.

Results

Median follow-up was 18 months (range: 6–56 months). Twelve patients out of 122 developed chest wall pain of any grade (seven with grade 1, three with grade 2 and two with grade 3 pain). In univariate analysis, only the volume receiving 30 Gy or more (P = 0.034) and the volume of the overlapping region between the planning target volume and chest wall (P = 0.038) significantly predicted chest wall pain, but these variables were later proved non-significant in multivariate regression.

Conclusion

Our analysis could not find any correlation between the studied parameters and chest wall pain. Considering our present study and the wide range of differing results from the literature, a reasonable conclusion is that a constraint for chest wall pain is yet to be defined.  相似文献   
99.
100.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号