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   18133篇
  免费   1457篇
  国内免费   42篇
耳鼻咽喉   128篇
儿科学   695篇
妇产科学   523篇
基础医学   2312篇
口腔科学   229篇
临床医学   2048篇
内科学   3426篇
皮肤病学   305篇
神经病学   1971篇
特种医学   298篇
外国民族医学   5篇
外科学   1946篇
综合类   144篇
一般理论   67篇
预防医学   2739篇
眼科学   264篇
药学   1144篇
  1篇
中国医学   38篇
肿瘤学   1349篇
  2024年   43篇
  2023年   281篇
  2022年   485篇
  2021年   914篇
  2020年   551篇
  2019年   755篇
  2018年   860篇
  2017年   613篇
  2016年   629篇
  2015年   695篇
  2014年   901篇
  2013年   1149篇
  2012年   1592篇
  2011年   1613篇
  2010年   824篇
  2009年   664篇
  2008年   1132篇
  2007年   1194篇
  2006年   962篇
  2005年   898篇
  2004年   811篇
  2003年   725篇
  2002年   536篇
  2001年   70篇
  2000年   54篇
  1999年   58篇
  1998年   110篇
  1997年   75篇
  1996年   37篇
  1995年   48篇
  1994年   40篇
  1993年   39篇
  1992年   28篇
  1991年   17篇
  1990年   15篇
  1989年   20篇
  1987年   9篇
  1986年   14篇
  1985年   16篇
  1984年   15篇
  1983年   6篇
  1982年   10篇
  1981年   14篇
  1980年   16篇
  1978年   5篇
  1977年   9篇
  1976年   5篇
  1975年   7篇
  1974年   8篇
  1961年   5篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
61.
BackgroundProtroca evaluated the efficacy and safety of primary and secondary prophylaxis of neutropenia with lipegfilgrastim (Lonquex®) in breast cancer patients receiving neoadjuvant or adjuvant chemotherapy (CT).Patients and MethodsOf the 255 patients enrolled, 248 patients were evaluable for the intent-to-treat (ITT) and 194 patients for the per-protocol set. Primary and secondary end points after lipegfilgrastim treatment were assessed.ResultsNine patients of the ITT set receiving lipegfilgrastim as primary prophylaxis (n = 222) had febrile neutropenia of grade 3–4 (5 patients) or infection of grade 3–4 (4 patients); 1/26 of those receiving secondary prophylaxis had an event. Dose reductions were performed in 9.5% of the patients. Postponement of cancer CT cycles for >3 days occurred in <15% of patients; 10.8% (92/851 AEs) and 8% (2/25 SAEs) of documented adverse events and serious adverse events, respectively, were related to lipegfilgrastim.ConclusionsApplication of lipegfilgrastim was effective as primary and secondary prophylaxis in the prevention of CT-induced neutropenia in breast cancer.  相似文献   
62.
63.
64.
65.
66.
67.
Yu  Hongjuan  Zeng  Xueyun  Sui  Mingjie  Liu  Rui  Tan  Rachel Lee-Yin  Yang  Jinjin  Huang  Weidong  Luo  Nan 《Quality of life research》2021,30(3):855-866
Quality of Life Research - This study aimed to compare the measurement properties of EQ-5D-3L(3L) and EQ-5D-5L(5L) in patients with acute myeloid leukemia (AML) in China. We consecutively recruited...  相似文献   
68.
Summary The pivotal event in Wallerian degeneration is the breakdown of the axon. Establishing the pathophysiology of axonal degeneration has implications for the understanding of the pathogenesis of other types of nerve degenerations. A key aspect of the pathophysiology is the spatiotemporal pattern of spread after transection, an issue that has remained controversial. We have studied the progression of axonal degeneration in the dorsal columns of the rat following L4L5L6 dorsal radiculotomy. Axonal degeneration proceeds in a proximo-distal fashion, beginning near the site of transection and spreading up the dorsal columns at a net rate of about 3 mmh–1. In addition, there was early degeneration of the preterminal axons in the gracile nuclei. This pattern suggests that the clearing of axonally transported materials from the distal stump by continued anterograde transport may underlie axonal breakdown after transection.  相似文献   
69.
The nature of autism in congenitally blind children has long been a source of interest and perplexity. A group of nine congenitally blind children with an autism-like syndrome were closely matched on chronological age and verbal mental age with nine sighted autistic children, and were compared on the Childhood Autism Rating Scale (Schopler, Reichler, & Renner, 1986) and the Behavior Checklist for Disordered Preschoolers, together with the Play Items for Disordered Preschoolers (Sherman, Shapiro, & Glassman, 1983). A checklist of clinical features characteristic of autism (derived from DSM-III-R) was also completed through an interview with teachers. There was substantial similarity between the groups, but also suggestive evidence of possible group differences, specifically in the domain of social-emotional responsiveness. Research on the psychological development of congenitally blind children promises to yield insights into the nature of autism itself.  相似文献   
70.
Rationale: A novel scheme for the synthesis of cocaine analogs from vinylcarbenoid precursors has made available compounds that have a diverse range of affinities for the DA and 5-HT transporters. These compounds were used to explore the relationship between their biochemical properties and their reinforcing effects. Objectives: The objective was to assess the reinforcing efficacy of selected cocaine analogs and compare the results with their selectivity in binding to DA and 5-HT transporters. Methods: Rats were prepared with chronically indwelling intravenous cannulae and trained to self-administer cocaine on a progressive ratio (PR) schedule. A range of doses of seven cocaine analogs were substituted for cocaine in separate groups of animals. Results: The results demonstrate a wide range of reinforcing efficacies and potencies among the seven selected drugs. Four tropane analogs (WF-11, WF-23, WF-24, WF-55) were found to support self-administration behavior on a PR schedule while three did not (WF-31, WF-54 and WF-60). The DA/5-HT selectivity ratio was found to be a better predictor of self-administration behavior than affinity at the DA transporter alone. Conclusion: These data suggest that drugs with a higher affinity for the DA versus the 5-HT transporter are more likely to be self-administered. Received: 29 October 1998 / Final version: 5 February 1999  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