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   69046篇
  免费   4712篇
  国内免费   196篇
耳鼻咽喉   707篇
儿科学   2165篇
妇产科学   1713篇
基础医学   9459篇
口腔科学   3697篇
临床医学   7152篇
内科学   13183篇
皮肤病学   1268篇
神经病学   6247篇
特种医学   1366篇
外国民族医学   6篇
外科学   7005篇
综合类   778篇
一般理论   53篇
预防医学   9003篇
眼科学   972篇
药学   4717篇
中国医学   375篇
肿瘤学   4088篇
  2023年   620篇
  2022年   1309篇
  2021年   2430篇
  2020年   1596篇
  2019年   2172篇
  2018年   2489篇
  2017年   1816篇
  2016年   1991篇
  2015年   2191篇
  2014年   2900篇
  2013年   3732篇
  2012年   5523篇
  2011年   6039篇
  2010年   3131篇
  2009年   2479篇
  2008年   4440篇
  2007年   4417篇
  2006年   3926篇
  2005年   3545篇
  2004年   3159篇
  2003年   2798篇
  2002年   2675篇
  2001年   936篇
  2000年   940篇
  1999年   807篇
  1998年   533篇
  1997年   381篇
  1996年   308篇
  1995年   310篇
  1994年   251篇
  1993年   214篇
  1992年   350篇
  1991年   303篇
  1990年   307篇
  1989年   283篇
  1988年   259篇
  1987年   204篇
  1986年   202篇
  1985年   172篇
  1984年   142篇
  1983年   128篇
  1982年   78篇
  1979年   115篇
  1978年   98篇
  1974年   85篇
  1973年   95篇
  1970年   91篇
  1969年   95篇
  1968年   76篇
  1967年   87篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
International Journal of Clinical Oncology - Immune-checkpoint inhibitors (ICIs) are standard treatments for metastatic non-small cell lung cancer (NSCLC). Patients with poor performance status...  相似文献   
2.
Bundesgesundheitsblatt - Gesundheitsforschung - Gesundheitsschutz - Akteure der öffentlichen Gesundheit (Public Health) tragen wesentlich zu Gesundheitsschutz, -förderung und...  相似文献   
3.
4.
Despite orientation and mobility (O&M) being a significant factor determining quality of life of people with low vision or blindness, there are no gold standard measures or agreement on how to measure O&M performance. In the first part of this systematic review, an inventory of O&M outcome measures used by recent studies to assess the performance of orientation and/or mobility of adults with vision impairment (low vision and blindness) is presented. A wide variety of O&M outcome measures have been implemented in different fields of study, such as epidemiologic research and interventional studies evaluating training, assistive technology, vision rehabilitation and vision restoration. The most frequent aspect of outcome measures is efficiency such as time, distance, speed and percentage of preferred walking speed, followed by obstacle contacts and avoidance, and dis/orientation and veering. Other less commonly used aspects are target identification, safety and social interaction and self-reported outcome measures. Some studies employ sophisticated equipment to capture and analyse O&M performance in a laboratory setting, while others carry out their assessment in real-world indoor or outdoor environments. In the second part of this review, the appropriateness of implementing the identified outcome measures to assess O&M performance in clinical and functional O&M practice is evaluated. Nearly a half of these outcome measures meet all four criteria of face validity (either clinical or functional), responsiveness, reliability and feasibility and have the potential to be implemented in clinical or functional O&M practice. The findings of this review confirm the complicated and dynamic nature of O&M. Multiple measures are required in any evaluation of O&M performance to facilitate holistic assessment of O&M abilities and limitations of each individual.  相似文献   
5.
6.
7.
Neorickettsia helminthoeca (NH), the agent of salmon poisoning disease or canine neorickettiosis (CN), is a bacterial endosymbiont of the nematode Nanophyetus salmincola, and infections are spreading among specific fish‐eating mammalians. This article describes the pathologic and immunohistochemical findings associated with spontaneous NH‐induced infections in dogs from Southern Brazil. The principal pathologic findings were hypertrophy of Peyer patches and lymphadenopathy with lymphocytic proliferation, chronic interstitial pneumonia, and chronic enteritis associated with positive intralesional immunoreactivity to antigens of NH within macrophages and histiocytes. Positive immunoreactivity against canine parvovirus‐2 (CPV‐2) or/and canine distemper virus was not detected in the evaluated intestinal segments or in the samples from the cerebellum and lungs, respectively, from the dogs evaluated. These findings demonstrated that NH was involved in the enteric, pulmonary, and lymphoid lesions herein described, and provide additional information to confirm the occurrence of this bacterial endosymbiont within this geographical location. It is proposed that chronic pneumonia should be considered as a pathologic manifestation of NH‐induced infections. Additionally, our results show that the occurrences of CN seem to be underdiagnosed in Southern Brazil due to the confusion with the incidence of CPV‐2.  相似文献   
8.
9.
Metabolism describes the series of chemical reactions that are concerned with the provision of energy to biological systems. They may be divided into reactions involved in energy yield (catabolism: demand exceeds supply), and energy storage (anabolism: supply exceeds demand). Regulation of these pathways is critical for homeostasis, and derangements in metabolism are seen in a wide variety of pathological processes. Understanding metabolism is key to the treatment of many diseases, notably diabetes, as well as underpinning clinical nutritional support.  相似文献   
10.
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