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   2319篇
  免费   200篇
  国内免费   15篇
耳鼻咽喉   24篇
儿科学   117篇
妇产科学   64篇
基础医学   301篇
口腔科学   32篇
临床医学   175篇
内科学   480篇
皮肤病学   35篇
神经病学   113篇
特种医学   190篇
外科学   281篇
综合类   60篇
一般理论   2篇
预防医学   408篇
眼科学   29篇
药学   159篇
中国医学   6篇
肿瘤学   58篇
  2023年   13篇
  2022年   12篇
  2021年   37篇
  2020年   21篇
  2019年   48篇
  2018年   67篇
  2017年   48篇
  2016年   37篇
  2015年   41篇
  2014年   59篇
  2013年   93篇
  2012年   131篇
  2011年   113篇
  2010年   77篇
  2009年   52篇
  2008年   95篇
  2007年   97篇
  2006年   93篇
  2005年   84篇
  2004年   96篇
  2003年   91篇
  2002年   74篇
  2001年   79篇
  2000年   73篇
  1999年   100篇
  1998年   49篇
  1997年   48篇
  1996年   47篇
  1995年   47篇
  1994年   43篇
  1993年   37篇
  1992年   42篇
  1991年   35篇
  1990年   32篇
  1989年   41篇
  1988年   32篇
  1987年   38篇
  1986年   38篇
  1985年   44篇
  1984年   27篇
  1983年   26篇
  1981年   14篇
  1980年   13篇
  1979年   12篇
  1977年   16篇
  1976年   13篇
  1975年   11篇
  1974年   12篇
  1973年   13篇
  1972年   13篇
排序方式: 共有2534条查询结果,搜索用时 31 毫秒
1.
2.
Primary tuberculous pathology in nasolpolypi is a rare condition. A case of bilateral ethmoidal polypi with tubercular lesion diagnosed on histopathologlcal examination is being reported and the available relevant literature has been reviewed.  相似文献   
3.
The use of programs to help administrators and staff of health care facilities assess and monitor the quality of services provided is not new. For years, quality assurance (QA) programs have provided generalized sets of standards against which hospitals and other agencies measure their performance. Recently, there has been a trend towards quality improvement (QI) programs which advocate a more proactive response to quality concerns and emphasize a decentralized use of assessment and evaluation findings to continuously improve the care provided. QI is recognized as holding great opportunities for the enhancement of professional nursing practice and the improvement of patient care. In this paper, the process and design of QI was described and the advantages of this approach were recognized.  相似文献   
4.
5.
6.
7.
8.
A deficiency of total energy or of one or more essential nutrients, including vitamins A, B6, B12, C, and E, folic acid, zinc, iron, copper, selenium, essential amino acids and essential fatty acids, will impair immune function and increase susceptibility of the host to infectious pathogens. This is most likely because these nutrients are involved in the molecular and cellular responses to challenge of the immune system. Providing these nutrients to deficient individuals restores immune function and improves resistance to infection. Thus, appropriate nutrition is required in order for the host to maintain adequate immune defences towards bacteria, viruses, fungi, parasites and tumour celîs. Although the intakes of several nutrients which result in greatest enhancement of immune function appear to be greater than recommended intakes, excess intake of certain nutrients also impairs immune responses. Some nutrients (e.g. glutamine, arginine) may become limiting in critical illness and there is mounting evidence that provision of these will aid patient recovery.  相似文献   
9.
Rates of protein turnover were measured in 19 infants during the first few days of life while they were receiving i.v. glucose. The technique consisted of a continuous i.v. infusion of L-[1-13C]leucine to measure whole body leucine flux and determination of total urinary nitrogen excretion to assess leucine oxidation rates. Subsequent to each of the studies, the decision to start total parenteral nutrition (TPN) was made by the clinician concerned, with the result that seven infants did not start TPN and 12 did. There were significantly greater urinary nitrogen excretion (p less than 0.001) and lower rates of whole body protein synthesis (p = 0.024) and breakdown (p = 0.015) in those who did start TPN compared with those who did not. The marked difference in nitrogen excretion between the two groups suggests that this could be a useful determinant for deciding which neonate should start TPN.  相似文献   
10.
目的:对临床确诊糖尿病患同时测定血清葡萄糖(Glu)及糖化血清蛋白(GSP)的含量,观察二的关系,以及糖化血清蛋白水平对于评价近期(2—3周)糖尿病患血糖在体内变化的临床意义进行了观察。方法:血清葡萄糖、糖化血清蛋白测定均采用酶法测定。结果:178例糖尿病患Glu、GSP均正常3l例占17.4%;Glu、GSP均增高107例占60.1%;Glu正常、GSP增高15例占8.43%;Glu增高、GSP正常25例占14%。结论:糖化血清蛋白的含量不受即时血糖的影响,二的变化不成比例性,对评价糖尿病患2~3周病情的控制是一项灵敏可靠的指标,尤其对于住院病人的治疗与监控有一定的意义。  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