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   1108篇
  免费   84篇
  国内免费   4篇
耳鼻咽喉   5篇
儿科学   19篇
妇产科学   20篇
基础医学   154篇
口腔科学   27篇
临床医学   131篇
内科学   254篇
皮肤病学   16篇
神经病学   91篇
特种医学   30篇
外科学   184篇
综合类   9篇
预防医学   109篇
眼科学   37篇
药学   53篇
肿瘤学   57篇
  2023年   6篇
  2022年   12篇
  2021年   17篇
  2020年   13篇
  2019年   16篇
  2018年   22篇
  2017年   14篇
  2016年   12篇
  2015年   21篇
  2014年   22篇
  2013年   37篇
  2012年   53篇
  2011年   62篇
  2010年   32篇
  2009年   20篇
  2008年   47篇
  2007年   59篇
  2006年   63篇
  2005年   56篇
  2004年   45篇
  2003年   41篇
  2002年   48篇
  2001年   32篇
  2000年   41篇
  1999年   31篇
  1998年   22篇
  1997年   14篇
  1995年   9篇
  1994年   9篇
  1992年   7篇
  1991年   9篇
  1990年   21篇
  1989年   16篇
  1988年   17篇
  1987年   14篇
  1986年   15篇
  1985年   8篇
  1984年   11篇
  1983年   11篇
  1982年   14篇
  1981年   12篇
  1980年   11篇
  1979年   10篇
  1977年   6篇
  1976年   6篇
  1974年   9篇
  1973年   11篇
  1972年   6篇
  1971年   6篇
  1969年   7篇
排序方式: 共有1196条查询结果,搜索用时 0 毫秒
91.
Twenty-two activities that support transition to adulthood previously published by Blomquist et al. 1998) were explored in a focus group with parents of successful young adults with disabilities. Parents rated these activities on a 5-point Likert scale, and comments were gathered about the activities parents felt were essential for transition to adulthood. Parents rated the activities high with highest agreement being: "Do not do for them what they can do for themselves," "Assign appropriate household chores," and "Help children interact with others in varied settings." The lowest agreement ratings involved issues about school to work transitions, vocational programs within schools, and strategies assuring continuity of care with adult health care providers. Parents offered insights into the daily activities in school, home, and community that support transition to adulthood. Through review and understanding of these transition activities, health care professionals gain insight into the activities fostering a child's independence throughout their development.  相似文献   
92.
L-743,872 is a broad-spectrum pneumocandin antifungal drug developed by Merck Research Co., and in the present work it was evaluated in vivo in murine models of Candida krusei and Candida glabrata infection. Mice were infected intravenously with two isolates of C. krusei and treated with fluconazole or L-743,872. Fluconazole was beneficial only in immune-competent mice infected with isolate 94-2696. At > 0.5 mg/kg of body weight/day, L-743,872 was effective against both infecting isolates in immune-competent and immune-suppressed mice. Against C. glabrata, L-743,872 was effective, at doses > or = 0.5 mg/kg, in reducing fungal cell counts in the kidneys but not in the spleen. L-743,872 has significant potential for clinical development.  相似文献   
93.
94.
95.
RATIONALE, AIMS AND OBJECTIVES: Clinical practice guidelines have become a standard way of implementing evidence-based practice, yet research has shown that clinicians do not always follow guidelines. METHOD: As part of a larger study to test the effects of an intervention on provider adherence to ischaemic heart disease (IHD) guidelines, we conducted five focus groups at three Veterans Administration Medical Centers with 32 primary care providers, cardiologists, and internists to identify key barriers and facilitators to adherence of the guidelines. Using content analysis, responses were grouped into categories. RESULTS: The main perceived advantages of using the IHD guidelines were improvements in quality and the cost of care. Perceived barriers were the lack of ability of guidelines to manage the care of any one individual patient, the difficulty of accessing guidelines, and high workloads with many complex patients. While providers agreed on the benefits of aspirin, beta-blockers and angiotensin converting enzyme inhibitors, barriers for use of these medications were lack of consensus about contraindications, difficulty in providing follow-up during medication titration, and lack of patient adherence. Sources of influence for guideline use were: professional cardiology organizations, colleagues, mainly cardiologists, and key cardiology journals. However, most providers acknowledged that following guidelines was a personal practice decision. CONCLUSIONS: While results validated the influences of using clinical practice guidelines, our results highlight the importance of ascertaining guideline-specific barriers for building effective interventions to improve provider adherence. An advisory panel reviewed results and, using a modified nominal group process, chose implementation strategies targeting key barriers.  相似文献   
96.
Treatment of murine disseminated candidiasis with L-743,872.   总被引:2,自引:4,他引:2       下载免费PDF全文
L-743,872 (M991), which is a pneumocandin derivative, was evaluated in a mouse model of disseminated candidiasis caused by a fluconazole-resistant isolate of Candida albicans. In immunocompetent mice M991 prolonged survival at doses as low as 0.0125 mg/kg of body weight per day. In neutropenic mice 0.05 mg/kg was the lowest effective dose. M991 is a very potent drug for treatment of disseminated candidiasis.  相似文献   
97.
It is within the T cell rich zone of secondary lymphoid organs (SLO) that dendritic cells (DC) present the captured pathogens to recirculating T cells in order to activate the rare antigen-specific T cells. While we have made considerable progress in understanding the biology of mobile hematopoietic cells found within SLO, notably DC and lymphocytes, we still have a lot to learn about the sessile stromal cells. This review is focused on the recent progress made in our understanding of the fibroblastic reticular stromal cells that form the 'niches' within the T zone.  相似文献   
98.
Previous investigations have linked decreased nuclear expression of the cell cycle inhibitor p27 with poor outcome in prostate cancer. However, these reports are inconsistent regarding the magnitude of that association and its independence from other predictors. Moreover, cytoplasmic translocation of p27 has been proposed as a negative prognostic sign. Given the cost and accuracy limitations of manual scoring, particularly of tissue microarrays, we determined if laser-based fluorescence microscopy could provide automated analysis of p27 in both nuclear and cytoplasmic locations and, thus, clarify its significance as a prognostic biomarker. We constructed tissue microarrays covering 202 recurrent cases (rising prostate-specific antigen) and 202 matched controls without recurrence. Quadruplicate tumor samples encompassed 5 slides and 1616 cancer histospots. Cases and controls matched on age, Gleason grade, stage, and hospital. We immunolabeled epithelial cytoplasm with Alexafluor 647, p27 with Alexafluor 488, and nuclei with 4c6-diamidino-2-phenylindole·2HCl. Slides were scanned on an iCys laser scanning cytometer (CompuCyte Corp, Cambridge, MA). Nuclear crowding required a stereological approach--random arrays of circles (phantoms) were layered on images and the content of each phantom was analyzed in scatter plots. Both nuclear and cytoplasmic p27 were significantly lower in cases versus controls (P = .014 and P = .004, respectively). Regression models controlling for matching variables plus prostate-specific antigen showed strong linear trends for increased risk of recurrence with lower p27 in both nucleus and cytoplasm (highest versus lowest quartile; odds ratio, 0.35; P = .006). Manual scoring identified an inverse association between p27 expression and tumor grade but no independent association with recurrence. In conclusion, we developed an automated method for subcellular scoring of p27 without the need to segment individual cells. Our method identified a strong relationship, independent of tumor grade, stage, and prostate-specific antigen, between p27 expression--regardless of subcellular location--and prostate cancer recurrence. This relationship was not observed with manual scoring.  相似文献   
99.
100.
The purpose of this essay is to overview our findings that membrane-associated calcium-independent phospholipase A2 is markedly inhibited by low, clinically relevant concentrations of anthracyclines. Our studies suggest that due to the essential role of this enzyme in membrane homeostasis, its inhibition can be one of the early culprits leading to anthracycline-induced cardiac dysfunction. The clinical importance and potential pharmaceutical use of this new phenomenon await further 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