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   4454篇
  免费   182篇
  国内免费   14篇
耳鼻咽喉   36篇
儿科学   79篇
妇产科学   72篇
基础医学   602篇
口腔科学   89篇
临床医学   224篇
内科学   1180篇
皮肤病学   31篇
神经病学   274篇
特种医学   262篇
外科学   707篇
综合类   16篇
预防医学   134篇
眼科学   49篇
药学   285篇
中国医学   15篇
肿瘤学   595篇
  2023年   17篇
  2022年   32篇
  2021年   51篇
  2020年   35篇
  2019年   53篇
  2018年   49篇
  2017年   54篇
  2016年   59篇
  2015年   93篇
  2014年   101篇
  2013年   128篇
  2012年   190篇
  2011年   216篇
  2010年   149篇
  2009年   107篇
  2008年   193篇
  2007年   247篇
  2006年   218篇
  2005年   218篇
  2004年   156篇
  2003年   187篇
  2002年   187篇
  2001年   111篇
  2000年   106篇
  1999年   117篇
  1998年   71篇
  1997年   62篇
  1996年   62篇
  1995年   48篇
  1994年   44篇
  1993年   59篇
  1992年   90篇
  1991年   104篇
  1990年   94篇
  1989年   109篇
  1988年   85篇
  1987年   94篇
  1986年   85篇
  1985年   88篇
  1984年   53篇
  1983年   41篇
  1982年   27篇
  1981年   32篇
  1980年   45篇
  1979年   44篇
  1978年   23篇
  1977年   27篇
  1976年   19篇
  1970年   21篇
  1969年   21篇
排序方式: 共有4650条查询结果,搜索用时 0 毫秒
81.
Isolated ACTH deficiency with Graves' disease: a case report   总被引:1,自引:0,他引:1  
A 60-year-old man was hospitalized with complaints of general malaise and weight loss. On admission, ACTH and cortisol levels were low, and thyroid function tests revealed hyperthyroidism. These findings and further examination led to a diagnosis of isolated ACTH deficiency (IAD) with Graves' disease. It is known that IAD is frequently associated with thyroid disease, but its association with Graves' disease is rare. The present case is worth noting, because some reports indicate that aggravation of associated Graves' disease may concomitantly aggravate adrenal insufficiency in patients with IAD.  相似文献   
82.
83.
84.
85.
86.
87.
Growth hormone (GH) has been implicated in a variety of brain functions, including neural development, cognition, and neuroprotection. The biological effects of GH are known to rely on the binding of GH to the GH receptor (GHR), yet the resulting signals in the brain remain poorly understood. The present study investigated the effects of hippocampal infusions of recombinant GH and a GHR antagonist on the expression of immediate early genes (IEGs) and behavioral responses in mice. The infusions induced differential expression of Arc, Nr4a1, and Npas4 mRNAs among the IEGs. The infusions also elicited differential behavioral responses, such as varied levels of spontaneous locomotion, self-grooming, and frequency of access to the corner fields in the open-field test. Polynomial regression analyses and canonical discriminant analyses between gene expression and behavioral changes demonstrated that the expression level of Arc mRNA was strongly correlated with locomotor activity level (r = 0.71 and 0.92 on days 8 and 10, respectively) and that the correlation was completely discriminable between drugs (error rate = 0 %). This analysis also revealed that a decrease in Npas4 mRNA was negatively correlated with the number of corner accesses (r = ?0.63) and that this correlation was partially discriminable between drugs (error rate = 16.67 %). Taken together, these results suggest that the GH–GHR complex modulates Arc and Npas4 signaling, which affects spontaneous locomotor and exploratory behaviors.  相似文献   
88.
To estimate the carbohydrate‐to‐insulin ratio (CIR), a formula dividing a constant, usually 300–500, by the total daily dose (TDD) of insulin, is widely utilized. An appropriate CIR varies for each meal of the day, however. Here, we investigate diurnal variation of CIR in hospitalized Japanese type 1 diabetic patients treated with continuous subcutaneous insulin infusion. After optimization of the insulin dose, TDD and total basal insulin dose (TBD) were 34.9 ± 10.2 and 9.3 ± 2.8 units, respectively, with a percentage of TBD to TDD of 27.3 ± 6.0%. The products of CIR and TDD at breakfast, lunch and dinner were 311 ± 63, 530 ± 161, and 396 ± 63, respectively, suggesting that in the formula estimating CIR using TDD, the constant should vary for each meal of the day, and that 300, 500, and 400 are appropriate for breakfast, lunch, and dinner, respectively.  相似文献   
89.
Clinical Oral Investigations - The biocompatible 2-methacryloyloxyethyl phosphorylcholine (MPC)-polymers, which mimic a biomembrane, reduce protein adsorption and bacterial adhesion and inhibit...  相似文献   
90.
ABSTRACT: We report F-fluorodeoxyglucose-positive Warthin tumor in a contralateral cervical lymph node mimicking metastasis in tongue cancer staging with positron emission tomography/computed tomography.  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