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   4068篇
  免费   270篇
  国内免费   14篇
耳鼻咽喉   25篇
儿科学   106篇
妇产科学   76篇
基础医学   555篇
口腔科学   76篇
临床医学   423篇
内科学   945篇
皮肤病学   57篇
神经病学   518篇
特种医学   62篇
外国民族医学   1篇
外科学   420篇
综合类   38篇
一般理论   1篇
预防医学   380篇
眼科学   41篇
药学   264篇
中国医学   6篇
肿瘤学   358篇
  2023年   40篇
  2022年   88篇
  2021年   163篇
  2020年   94篇
  2019年   129篇
  2018年   141篇
  2017年   95篇
  2016年   117篇
  2015年   122篇
  2014年   191篇
  2013年   197篇
  2012年   330篇
  2011年   332篇
  2010年   159篇
  2009年   178篇
  2008年   231篇
  2007年   253篇
  2006年   249篇
  2005年   187篇
  2004年   196篇
  2003年   202篇
  2002年   177篇
  2001年   26篇
  2000年   32篇
  1999年   30篇
  1998年   27篇
  1997年   28篇
  1996年   20篇
  1995年   18篇
  1994年   19篇
  1993年   17篇
  1992年   12篇
  1991年   12篇
  1990年   9篇
  1989年   8篇
  1988年   13篇
  1987年   16篇
  1986年   10篇
  1985年   15篇
  1984年   13篇
  1983年   9篇
  1982年   8篇
  1981年   11篇
  1979年   9篇
  1977年   9篇
  1976年   7篇
  1974年   10篇
  1969年   14篇
  1968年   13篇
  1967年   9篇
排序方式: 共有4352条查询结果,搜索用时 46 毫秒
11.
12.
13.
Prosopagnosia is currently viewed within the constraints of two competing theories of face recognition, one highlighting the analysis of features, the other focusing on configural processing of the whole face. This study investigated the role of feature analysis versus whole face configural processing in the recognition of facial expression. A prosopagnosic patient, SC made expression decisions from whole and incomplete (eyes-only and mouth-only) faces where features had been obscured. SC was impaired at recognizing some (e.g., anger, sadness, and fear), but not all (e.g., happiness) emotional expressions from the whole face. Analyses of his performance on incomplete faces indicated that his recognition of some expressions actually improved relative to his performance on the whole face condition. We argue that in SC interference from damaged configural processes seem to override an intact ability to utilize part-based or local feature cues.  相似文献   
14.
Thirty-eight patients with varying degrees of vaginal wall prolapse were operated on using the Neugebauer-Le Fort technique. Their ages ranged from 59 to 90 years. Grand multiparity (> 4) was relatively uncommon (26%). Symptoms were present for more than two years in over half of the women. Serious medical conditions requiring preoperative attention were present in 55% of patients. If the uterus was present, dilation and curettage (D&C) was performed prior to the operation. Intraoperative complications were virtually absent; however, minor postoperative complications occurred in 30% of the patients. None of these complications were related to surgery or altered discharge plans. There were no deaths. No recurrences of prolapse were reported among 30 patients who were followed.  相似文献   
15.
Background Significant tumor downstaging has been achieved in patients with localized gastric or gastroesophageal adenocarcinoma by induction chemotherapy and preoperative chemoradiotherapy (CTX–CTXRT). However, the influence of CTX–CTXRT on operative morbidity and mortality has not yet been clarified. The aim of the present study was to document the frequency and nature of morbidity and mortality after surgery combined with CTX–CTXRT, and identify factors predictive of postoperative complications in patients with localized gastric or gastroesophageal adenocarcinoma. Methods A prospectively collected database on 71 consecutive patients who underwent CTX–CTXRT at M.D. Anderson Cancer Center between January 1997 and August 2004 was reviewed. Postoperative morbidity and mortality were investigated, and risk factors for overall complications were identified by multivariate logistic regression analysis. Results Overall morbidity and mortality rates were 38.0% (27 patients) and 2.8% (2 patients), respectively. Age greater than 60 years [relative risk 11.3 (95% confidence interval 2.50–50.6)] and body mass index (BMI) of 26 kg/m2 or above [relative risk 4.08 (95% confidence interval 1.08–15.4)] were significant risk factors for overall complications. Conclusions CTX–CTXRT can be performed safely with an acceptable operative morbidity and a low operative mortality rate in patients with gastric or gastroesophageal cancer, with careful consideration of added risk associated with age and obesity.  相似文献   
16.
17.

Background  

Neurotrophin 3 (NT-3) is a member of the neurotrophin family, a group of related proteins that are known to regulate neuro-immune interactions in allergic diseases. Their cellular sources and role in the recruitment of mast cell precursors in atopic dermatitis have not been characterized in detail so far.  相似文献   
18.
A 528-bed community teaching hospital redesigned its patient care delivery system, implementing a collaborative practice model on the 30-bed inpatient rehabilitation unit in April 1990. This model is a patient-centered delivery model that encourages the healthcare team to facilitate the achievement of patient outcomes within effective time frames and with an appropriate use of resources. The collaborative practice model includes a nurse case manager's role for the staff nurse, which had as its framework the concept of nursing case management. Tested project management techniques were used to ensure a successful implementation process. Various strategies, such as using project teams and providing educational programs, were used to respond to the issues of role conflict and overlap, especially between social workers and nurse case managers. The implementation of this model provided a number of benefits, including improved interdisciplinary relationships and decreased length of stay.  相似文献   
19.
Most individuals with constitutional deletions of chromosome 18q have developmental delays, dysmyelination of the brain, and growth failure due to growth hormone deficiency. We monitored the effects of growth hormone treatment by evaluating 23 individuals for changes in growth, nonverbal intelligence quotient (nIQ), and quantitative brain MRI changes. Over an average of 37 months, the treated group of 13 children had an average nIQ increase of 17 points, an increase in height standard deviation score of 1.7, and significant change in T1 relaxation times in the caudate and frontal white matter. Cognitive changes of this magnitude are clinically significant and are anticipated to have an effect on the long-term outcomes for the treated individuals.  相似文献   
20.
Mutations in the Parkin (PARK2) and the DJ1 (PARK7) gene cause early-onset Parkinson disease (EOPD). We tested 75 Serbian EOPD patients for mutations in both genes by conventional mutational screening (SSCP/dHPLC/sequencing) to detect small sequence alterations and by gene dosage studies (quantitative PCR) to reveal deletions or multiplications of one or more exons. A compound heterozygous Parkin mutation (exon deletion and point mutation; [c.836_972del]+[c.1411C>T]; +1 is first nucleotide of GenBank AB009973.1) was identified in a patient who showed a relatively benign course after a disease onset at 41 years. Another case had a heterozygous exon deletion in DJ1 ([c.253_322del]+[?]) and presented with an age at onset of 45 years and a rapid disease course. In conclusion, Parkin mutations are surprisingly rare in our Serbian EOPD sample, suggesting that the mutation rate depends on the ethnic origin of the patients. Although DJ1 mutations appear to be rare, we confirm their role in EOPD and demonstrate the importance of gene dosage studies.  相似文献   
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