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   9403篇
  免费   708篇
  国内免费   10篇
耳鼻咽喉   158篇
儿科学   366篇
妇产科学   370篇
基础医学   1320篇
口腔科学   455篇
临床医学   953篇
内科学   1510篇
皮肤病学   272篇
神经病学   873篇
特种医学   299篇
外科学   1440篇
综合类   141篇
一般理论   3篇
预防医学   754篇
眼科学   214篇
药学   526篇
中国医学   13篇
肿瘤学   454篇
  2021年   144篇
  2020年   77篇
  2019年   136篇
  2018年   151篇
  2017年   108篇
  2016年   138篇
  2015年   138篇
  2014年   205篇
  2013年   273篇
  2012年   362篇
  2011年   430篇
  2010年   228篇
  2009年   236篇
  2008年   351篇
  2007年   406篇
  2006年   438篇
  2005年   372篇
  2004年   359篇
  2003年   285篇
  2002年   292篇
  2001年   311篇
  2000年   286篇
  1999年   256篇
  1998年   97篇
  1997年   92篇
  1996年   79篇
  1995年   90篇
  1994年   78篇
  1993年   83篇
  1992年   209篇
  1991年   174篇
  1990年   216篇
  1989年   203篇
  1988年   206篇
  1987年   192篇
  1986年   178篇
  1985年   167篇
  1984年   138篇
  1983年   118篇
  1979年   117篇
  1978年   89篇
  1977年   79篇
  1975年   88篇
  1974年   91篇
  1973年   89篇
  1972年   78篇
  1971年   85篇
  1970年   83篇
  1969年   77篇
  1968年   76篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
101.
"Investigation of Professionalism in Nursing Behaviors" was funded by the Beta Upsilon Chapter of Sigma Theta Tau International and the College of Nursing, Arizona State University. Researchers asked 514 nurses in eight western states if they had a copy of the Code For Nurses. Most respondents did not have a copy of the Code; however, they indicated that adherence to the Code was essential to the professional nurse. Years of practice, educational background, participation in autonomous activities, and present position were variables used to determine those respondents most likely to possess a copy of the Code. Implications for continuing educators are discussed.  相似文献   
102.
Sulfate free-electrolyte lavage solution is a new osmotically balanced electrolyte gut lavage solution for colon surgery that has been formulated for improved taste and reduced water and electrolyte changes. Sixty patients were prospectively randomized to receive a 1-day preparation with sulfate free-electrolyte lavage solution or a 3-day preparation using a clear liquid diet, cathartics, and enemas. The patient groups were similar in age, race, male-female ratio, and the types of colonic resections performed. Colonic cleansing was better with sulfate free-electrolyte lavage solution (100% vs 63% "good" to "excellent" cleansing). Patient tolerance evaluated by a questionnaire showed more overall discomfort with sulfate free-electrolyte lavage solution but no difference between the preparations in individual symptoms of fullness, cramping, nausea, or vomiting. One patient developed a low level of serum potassium after a cathartic and enema preparation, while there were no complications with sulfate free-electrolyte lavage solution. Patient taste questionnaires showed a slight preference for sulfate free-electrolyte lavage solution (53%) over a polyethylene glycol electrolyte lavage solution (47%). This study confirms that sulfate free-electrolyte lavage solution is a safe and effective method of preoperative colonic cleansing.  相似文献   
103.
104.
Giess R  Beck M  Goetz R  Nitsch RM  Toyka KV  Sendtner M 《Neurology》2000,54(4):1003-1005
Leukemia inhibitory factor (lif) is a potent survival factor for motoneurons in cell culture and in vivo. The authors screened 104 patients with ALS and 338 control subjects for mutations in the LIF gene. In four ALS patients, but in no control subject, a G-to-A point mutation at position 3400 was identified, which leads to an amino acid exchange of valine to methionine at position 64 of the mature lif protein. This region of the lif protein (AB loop) interacts with the lif receptor. The authors suggest that LIF could act as a modifier gene which, in combination with other genetic predispositions, might lead to motoneuron disease.  相似文献   
105.
106.
107.
108.
Sialorrhoea is a socially disabling problem in bulbar amyotrophic lateral sclerosis (ALS). Botulinum toxin A (BoNT/A) was injected into the salivary glands in five patients with bulbar ALS and sialorrhoea. The effect of BoNT/A was measured by the number of paper handkerchiefs used each day and by salivary gland scintigraphy. BoNT/A ameliorated sialorrhoea and quality of life without major adverse effects. BoNT/A may be a relatively safe and effective treatment for sialorrhoea in selected patients.  相似文献   
109.
In order to find out whether the increased phosphofructokinase (PFK) activities observed in brains from Alzheimer's disease (AD) patients are associated with alterations in PFK mRNA levels, we determined total PFK mRNA and the three different PFK isoenzyme mRNAs in AD and control patients by ribonuclease protection assay (RPA) and quantitative RT-PCR. PFK mRNA levels were found increased in some brain areas in AD patients. While all three PFK isoenzyme mRNAs were detectable in every studied brain sample, no changes of the PFK isoenzyme pattern were observed in patients with AD.  相似文献   
110.
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