全文获取类型
收费全文 | 2319篇 |
免费 | 200篇 |
国内免费 | 15篇 |
专业分类
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 |
出版年
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.
PC Chamyal A Mehta SL Ojha JR Bhardwaj 《Indian journal of otolaryngology and head and neck surgery》1991,43(1):26-27
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.
K Calder 《AARN news letter》1991,47(5):10-12
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.
Protein turnover rates in sick, premature neonates during the first few days of life. 总被引:1,自引:0,他引:1
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