全文获取类型
收费全文 | 2696384篇 |
免费 | 189819篇 |
国内免费 | 7901篇 |
专业分类
耳鼻咽喉 | 35864篇 |
儿科学 | 88406篇 |
妇产科学 | 73882篇 |
基础医学 | 377501篇 |
口腔科学 | 75453篇 |
临床医学 | 242708篇 |
内科学 | 538616篇 |
皮肤病学 | 64978篇 |
神经病学 | 222423篇 |
特种医学 | 103137篇 |
外国民族医学 | 752篇 |
外科学 | 399565篇 |
综合类 | 51395篇 |
现状与发展 | 6篇 |
一般理论 | 1007篇 |
预防医学 | 208344篇 |
眼科学 | 58905篇 |
药学 | 194587篇 |
8篇 | |
中国医学 | 5859篇 |
肿瘤学 | 150708篇 |
出版年
2021年 | 22698篇 |
2019年 | 23062篇 |
2018年 | 32647篇 |
2017年 | 24987篇 |
2016年 | 28488篇 |
2015年 | 32184篇 |
2014年 | 44183篇 |
2013年 | 65047篇 |
2012年 | 87448篇 |
2011年 | 92259篇 |
2010年 | 54932篇 |
2009年 | 52498篇 |
2008年 | 84748篇 |
2007年 | 89966篇 |
2006年 | 91163篇 |
2005年 | 87510篇 |
2004年 | 84250篇 |
2003年 | 80956篇 |
2002年 | 76821篇 |
2001年 | 130495篇 |
2000年 | 133350篇 |
1999年 | 112337篇 |
1998年 | 32064篇 |
1997年 | 28596篇 |
1996年 | 28883篇 |
1995年 | 27925篇 |
1994年 | 25608篇 |
1993年 | 23956篇 |
1992年 | 86461篇 |
1991年 | 82786篇 |
1990年 | 79906篇 |
1989年 | 77173篇 |
1988年 | 70533篇 |
1987年 | 69010篇 |
1986年 | 64479篇 |
1985年 | 61394篇 |
1984年 | 45630篇 |
1983年 | 38517篇 |
1982年 | 22775篇 |
1981年 | 20287篇 |
1979年 | 39541篇 |
1978年 | 27776篇 |
1977年 | 23561篇 |
1976年 | 21736篇 |
1975年 | 23156篇 |
1974年 | 27142篇 |
1973年 | 25743篇 |
1972年 | 24061篇 |
1971年 | 22242篇 |
1970年 | 20498篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
51.
Todd M. Getz 《Transfusion and apheresis science》2019,58(1):12-15
Platelet transfusions are a life-saving medical intervention used for the treatment of thrombocytopenia or hemorrhage. Extensive research has gone into trying to understand how to store platelets prior to the transfusion event. Much has been learned about storage bag materials, synthetic solutions, and how temperature impacts platelet viability and function. While room temperature storage of platelets preserves 24-hour in vivo platelet recovery and survival there is a greater risk for bacterial growth. Therefore, cold storage of platelets has become attractive due to the reduction in potential bacterial proliferation and the maintenance of platelet function beyond 5 days of storage. Cold stored platelets, however, have their own set of challenges. Cold stored platelets become activated through several mechanisms. The morphological and molecular changes that occur due to cold exposure enhance their ability to participate in the hemostatic process at the cost of rapid clearance from circulation. This review focuses on the underlying mechanisms leading to cold platelet activation and the receptor modifications involved in platelet clearance. 相似文献
52.
Sundaram Kavin Piuzzi Nicolas S. Patterson Brendan M. Stearns Kim L. Krebs Viktor E. Mont Michael A. 《European journal of orthopaedic surgery & traumatology : orthopedie traumatologie》2020,30(3):447-453
European Journal of Orthopaedic Surgery & Traumatology - The goals of this study were to compare patient satisfaction and wound-related complications in patients receiving 2-octyl cyanoacrylate... 相似文献
53.
54.
Ahmed M. Abu El-Asrar Ajmal Ahmad Eef Allegaert Mohammad Mairaj Siddiquei Priscilla W. Gikandi Gert De Hertogh 《Ocular immunology and inflammation》2020,28(4):575-588
ABSTRACT
Purpose
To investigate the expression of IL-11 and its receptor IL-11Rα and to quantify density of CD163+ M2 macrophages in proliferative diabetic retinopathy (PDR). 相似文献55.
56.
Nurse perceptions of the Nursing Delirium Screening Scale in two palliative care inpatient units: a focus group study 下载免费PDF全文
57.
Methicillin‐resistant Staphylococcus aureus eradication in young infants should include the diaper area and treat housing contacts 下载免费PDF全文
58.
59.
Erin C. Tully Jackson M. Gray Sherryl H. Goodman Stephen Nowicki Jr. 《Early child development and care》2016,186(12):1939-1951
Children who expect they can bring about good outcomes and avoid bad outcomes tend to experience more personal successes. Little is known about factors that contribute to these ‘control expectancies’. The purpose of the present study was to determine whether children's internal control expectancies occur in the context of parents’ internal control expectancies, low family strain, and high family cohesiveness and whether these factors are more strongly related to daughters’ than sons’ control expectancies. A community sample of 85 children aged 9–11 years and their parents (85 mothers; 63 fathers) completed rating scales. Fathers’ more internal control expectancies and mothers’ reports of fewer family strains were associated with daughters’ but not sons’ greater internal control expectancies, and greater family cohesiveness was related to both daughters’ and sons’ internal control orientations. These findings suggest that family factors may contribute to children's, particularly daughters’, development of internal control expectancies. 相似文献
60.
Dalton Luiz Schiessel Ricardo K. Yamazaki Marcelo Kryczyk Isabela Coelho de Castro Adriana A. Yamaguchi Danielle C. T. Pequito 《Nutrition and cancer》2016,68(8):1369-1380
Objective: Polyunsaturated fatty acids n-3 (PUFA n-3) have shown effects in reducing tumor growth, in particular eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) abundantly present in fish oil (FO). When these fatty acids are provided in the diet, they alter the functions of the cells, particularly in tumor and immune cells. However, the effects of α-linolenic fatty acid (ALA), which is the precursor of EPA and DHA, are controversial. Thus, our objective was to test the effect of this parental fatty acid. Methods: Non-tumor-bearing and tumor-bearing Wistar rats (70 days) were supplemented with 1 g/kg body weight of FO or Oro Inca® (OI) oil (rich in ALA). Immune cells function, proliferation, cytokine production, and subpopulation profile were evaluated. Results: We have shown that innate immune cells enhanced phagocytosis capacity, and increased processing and elimination of antigens. Moreover, there was a decrease in production of pro-inflammatory cytokines (tumor necrosis factor-alpha (TNF-α) and interleukin 6 (IL-6)) by macrophages. Lymphocytes showed decreased proliferation capacity, increased cluster of differentiation 8 (CD8+) subpopulation, and increased TNF-α production. Conclusions: Oil rich in ALA caused similar immune modulation in cancer when compared with FO. 相似文献