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   921篇
  免费   66篇
  国内免费   3篇
耳鼻咽喉   13篇
儿科学   49篇
妇产科学   16篇
基础医学   99篇
口腔科学   14篇
临床医学   70篇
内科学   167篇
皮肤病学   30篇
神经病学   27篇
特种医学   180篇
外科学   94篇
综合类   45篇
预防医学   64篇
眼科学   33篇
药学   37篇
中国医学   12篇
肿瘤学   40篇
  2023年   2篇
  2022年   4篇
  2021年   9篇
  2020年   13篇
  2019年   10篇
  2018年   11篇
  2017年   15篇
  2016年   7篇
  2015年   19篇
  2014年   26篇
  2013年   40篇
  2012年   28篇
  2011年   35篇
  2010年   35篇
  2009年   47篇
  2008年   26篇
  2007年   34篇
  2006年   36篇
  2005年   26篇
  2004年   42篇
  2003年   27篇
  2002年   28篇
  2001年   26篇
  2000年   18篇
  1999年   29篇
  1998年   30篇
  1997年   47篇
  1996年   35篇
  1995年   23篇
  1994年   27篇
  1993年   23篇
  1992年   16篇
  1991年   7篇
  1990年   16篇
  1989年   36篇
  1988年   16篇
  1987年   11篇
  1986年   16篇
  1985年   20篇
  1984年   7篇
  1983年   3篇
  1982年   2篇
  1981年   6篇
  1980年   12篇
  1979年   6篇
  1978年   5篇
  1977年   14篇
  1976年   4篇
  1975年   4篇
  1966年   3篇
排序方式: 共有990条查询结果,搜索用时 15 毫秒
11.
Amiodarone is an iodinated antiarrhythmic agent that is effective in the treatment of atrial and ventricular arrhythmias. A number of side effects are seen, including pulmonary toxicity and thyroid dysfunction. A patient with both amiodarone-induced pneumonitis and hyperthyroidism who exhibited abnormal gallium activity in the lungs, as well as diffuse gallium uptake in the thyroid gland is presented. The latter has not been previously reported and supports the concept of iodide-induced "thyroiditis" with gallium uptake reflecting the inflammatory response.  相似文献   
12.
创伤病人的手术与焦虑状态调查   总被引:6,自引:0,他引:6  
采用状态——特质焦虑问卷及10项躯体性焦虑测试题,对40例外科创伤病人手术前后的焦虑状态调查显示:术前状态焦虑量表评分显著高于术后;术前躯体性焦虑评分显著高于术后;高特质焦虑评分亚组与低特质焦虑评分亚组术前状态焦虑评分无显著差异,但术后则前者显著高于后者;急诊手术者手术前后状态焦虑评分显著高于择期手术者。  相似文献   
13.
Use of polyethylene glycol (PEG) to promote adsorption of autoantibodies is reported to give good recovery of concomitant alloantibodies. In initial experiments, PEG and ZZAP (Ficin and DTT) adsorption procedures were compared for removal of autoantibody and recovery of alloantibody. Postadsorption studies (n = 11) were performed and hemagglutination scores compared. In subsequent studies, equal volumes of alloantibody containing sera, PEG, and antigen-negative red blood cells (RBCs) were used in twofold adsorption experiments. Saline was substituted for PEG for control purposes. Postadsorption titers and immunoglobulin levels were determined. Autoantibodies were completely removed by both methods (n = 5); better by PEG (n = 3); better by ZZAP (n = 1); and not adsorbed (n = 1), and partially adsorbed by both (n = 1). Alloantibody recovery was comparable in three cases (E, K, Jka) but weaker by at least one reaction grade in four (K,E, Jka, and antibody to low-frequency antigen). The latter anti-Jka reacted 1+ with Jk(a+b+) RBCs after ZZAP adsorption but was nonreactive with the same RBCs following PEG adsorption. Titers of six alloantibodies adsorbed with antigen-negative RBCs in PEG were markedly weaker (range 2 to 8) compared to saline controls (range 4 to 32). IgG levels for PEG adsorbed (range 128 to 243 mg/dL) were 50% lower than controls (range 265 to 505 mg/dL). Although PEG adsorption is effective in removing autoantibody, the precipitation of immunoglobulin by PEG may result in failure to detect underlying alloantibody.  相似文献   
14.
15.
The allelic frequency of the gene for the K variant of butyrylcholinesterase (BCHE-K) was 0.17 in 74 subjects with late-onset (age > 65 years) histopathologically diagnosed Alzheimer's disease (AD), which was higher than the frequencies in 104 elderly control subjects (0.09), in 14 early-onset cases of confirmed AD (0.07) and in 29 confirmed cases of other dementia (0.10). The association of BCHE-K with late-onset AD was limited to carriers of the epsilon 4 allele of the apolipoprotein E gene (APOE), among whom the presence of BCHE-K gave an odds ratio of confirmed late-onset AD of 6.9 (95% C.I. 1.65-29) in subjects > 65 years and of 12.8 (1.9-86) in subjects > 75 years. In APOE epsilon 4 carriers over 75 years, only 1/22 controls, compared with 10/24 confirmed late-onset AD cases, had BCHE-K. We suggest that BCHE-K, or a nearby gene on chromosome 3, acts in synergy with APOE epsilon 4 as a susceptibility gene for late-onset AD.   相似文献   
16.
17.
18.

Background  

The purpose of the present investigation was to determine if the salivary counts of 40 common oral bacteria in subjects with an oral squamous cell carcinoma (OSCC) lesion would differ from those found in cancer-free (OSCC-free) controls.  相似文献   
19.
Drug adherence is one of the important aspects in caring for patients with allergic rhinitis. To improve clinical efficacy of early treatment for Japanese cedar pollinosis (JCP), we evaluated the effect of drug adherence on patients' outcomes. Patients were randomly selected from 16 ENT clinical sites in Osaka and Wakayama between February 24 and March 8, 2003 (peak pollen season). Efficacy was assessed using patients' ratings of nasal and ocular symptoms and overall assessment in their condition compared with previous season ones. Costs include direct costs of the drugs used for treatment to JCP from January to February. Five hundred one patients taking early treatment were enrolled. Compared to low adherence patients, those who reported higher level of adherence significantly improved overall health condition, and achieved better symptom relief of rhinorrhea and nasal congestion. In multiple logistic regression analysis, the following factors were independent risk factors for low adherence: student (p=0.002), using OTC medications (p=0.006), and short-duration of medication (p=0.001). Low costs were also risk factor for low adherence. We conclude that taking medications for JCP for 22-28 days is the best way to enhance patients' outcomes.  相似文献   
20.
Dong  Dake  Xu  Xiaowei  Feng  Cheng  Xiong  Huizi  Pan  Zhanyan 《Lasers in medical science》2021,36(1):139-146
Lasers in Medical Science - Phototherapy is an effective therapeutic option in the treatment of vitiligo; however, responses varied among the different types. The underlying mechanism has scarcely...  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