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   5134篇
  免费   271篇
  国内免费   36篇
耳鼻咽喉   50篇
儿科学   96篇
妇产科学   127篇
基础医学   659篇
口腔科学   129篇
临床医学   434篇
内科学   1207篇
皮肤病学   118篇
神经病学   653篇
特种医学   160篇
外科学   794篇
综合类   10篇
一般理论   1篇
预防医学   239篇
眼科学   55篇
药学   303篇
中国医学   3篇
肿瘤学   403篇
  2024年   10篇
  2023年   41篇
  2022年   105篇
  2021年   167篇
  2020年   112篇
  2019年   117篇
  2018年   162篇
  2017年   131篇
  2016年   157篇
  2015年   147篇
  2014年   229篇
  2013年   277篇
  2012年   401篇
  2011年   392篇
  2010年   247篇
  2009年   202篇
  2008年   359篇
  2007年   295篇
  2006年   260篇
  2005年   269篇
  2004年   252篇
  2003年   254篇
  2002年   178篇
  2001年   73篇
  2000年   56篇
  1999年   72篇
  1998年   22篇
  1997年   15篇
  1996年   23篇
  1995年   13篇
  1994年   11篇
  1993年   7篇
  1992年   32篇
  1991年   38篇
  1990年   37篇
  1989年   38篇
  1988年   36篇
  1987年   35篇
  1986年   32篇
  1985年   37篇
  1984年   14篇
  1983年   8篇
  1981年   9篇
  1979年   7篇
  1977年   4篇
  1975年   6篇
  1974年   4篇
  1969年   7篇
  1967年   5篇
  1966年   4篇
排序方式: 共有5441条查询结果,搜索用时 31 毫秒
51.
52.
Recent studies have suggested that CRP may interfere with insulin signaling in skeletal muscle and endothelial cells. The aim of this study was to determine whether highly purified CRP increased the rate of glucose appearance in primary hepatocytes in the absence or presence of insulin. Primary rat hepatocytes were provided glucose-free media containing 10 mM lactate, 1 mM pyruvate, 0, 1 or 10 nM insulin, and 0 or 10 μg/ml of purified CRP for 6h. Purified CRP did not increase glucose release in the absence of insulin and did not reduce the ability of insulin to suppress glucose release.  相似文献   
53.
ABSTRACT: BACKGROUND: Congenital nasal pyriform aperture stenosis is a rare and potentially lethal form of airway obstruction in newborns. Immediate recognition and appropriate therapy are mandatory for this potentially life-threating condition. This anomaly may present as an isolated malformation or may be associated with other cranial-facial anomalies. Clinically, CNPS shows unspecific symptoms of nasal airway obstruction such as apnoic crisis, episodic cyanosis and inability to nurse. The purpose of this report is to present author's experience in the surgical management of this rare pathology in 3 patients. Patients and Methods Three cases of congenital nasal pyriform aperture stenosis were reviewed for presentation of the disorder, management and effectiveness of the surgical treatment. RESULTS: All the patients underwent a surgical correction of the pyriform aperture stenosis using a sublabial approach followed by nasal stenting. During the follow-up no cases of restenosis, respiratory failure or cyanosis were detected. CONCLUSIONS: Congenital pyriform aperture stenosis should be suspected in newborns with clinical signs of severe nasal obstruction associated with a difficulty to pass a small catheter though the anterior nasal valve. Timely recognition is mandatory to prevent a potential deadly outcome. Surgical correction of the stenosis though a sublabial approach followed by a nasal stenting revealed to be most effective treatment for these patients.  相似文献   
54.
55.
56.
57.
58.
OBJECTIVES:: The diagnosis and control of hypertension depend on accurate measurement of blood pressure (BP). The literature on the accuracy of BP recording by health professionals is, however, limited, and no study directly interviewed patients in the hospital setting. This multicenter cross-sectional study aimed at evaluating the compliance to current recommendations on BP measurement by health professionals directly from patients and to investigate potential predictors of higher quality in BP recording. METHODS:: A trained nurse interviewed a random sample of adult patients hospitalized for an ordinary admission (except in the emergency room) lasting more than one night, without mental disorder, who had their BP routinely measured by the hospital personnel less than 3?h before. The questionnaire contained 15 items on the main procedures that are common to current guidelines. RESULTS:: Fourteen public hospitals from seven regions of Italy participated, and 1334 questionnaires were collected. Nine of the recommended practices were followed in the majority (>70%) of BP recordings, whereas some others were infrequent or rare: in 98.6, 82.2 and 81.1% of the participants, respectively, the arm circumference was never recorded, BP was measured only once, and BP was never recorded in both arms. Overall, 10 or more recommended procedures were followed during 33.4% recordings. At multivariate analysis, physicians were less likely than nurses to provide a more accurate BP measurement. CONCLUSIONS:: The operator's compliance to some recommendations in BP measurement is unacceptably low. This survey provides detailed indications for medical directors on the procedures and settings to prioritize in educational programs, which are definitely needed.  相似文献   
59.
We explored whether time and space representations modulate each other in subjects that are trained to integrate time and space dimensions, i.e., professional dancers. A group of dancers, and one of non-dancers, underwent two different tasks employing identical stimuli. A first static central line could last one of three possible durations and could have one of three possible lengths. A second growing line appeared from the left or right of the screen and grew up toward the opposite direction at constant velocity. In the Spatial task, subjects encoded the length of the static line and stopped the growing line when it had reached half the length of the static one, regardless of time travel. In the Temporal task, subjects encoded the duration of the static line and stopped the growing line when it had lasted half the duration of the static one, regardless of space traveled. Dancers, differently from non-dancers, anticipated time in the Temporal task. However, both dancers and non-dancers were biased by the stimulus length when performing the Temporal task, while they were not biased by the stimulus duration when performing the Spatial task. Concluding, this study underlines the plasticity of time dimension that can be influenced by spatial information and by sensorimotor training for the synchronization in space and time.  相似文献   
60.
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