全文获取类型
收费全文 | 34168篇 |
免费 | 6041篇 |
国内免费 | 94篇 |
专业分类
耳鼻咽喉 | 211篇 |
儿科学 | 986篇 |
妇产科学 | 2003篇 |
基础医学 | 2020篇 |
口腔科学 | 275篇 |
临床医学 | 17384篇 |
内科学 | 4915篇 |
皮肤病学 | 222篇 |
神经病学 | 2210篇 |
特种医学 | 527篇 |
外科学 | 2415篇 |
综合类 | 207篇 |
一般理论 | 15篇 |
预防医学 | 3817篇 |
眼科学 | 367篇 |
药学 | 946篇 |
中国医学 | 12篇 |
肿瘤学 | 1771篇 |
出版年
2024年 | 71篇 |
2023年 | 886篇 |
2022年 | 304篇 |
2021年 | 767篇 |
2020年 | 930篇 |
2019年 | 703篇 |
2018年 | 1582篇 |
2017年 | 1708篇 |
2016年 | 1798篇 |
2015年 | 1874篇 |
2014年 | 2082篇 |
2013年 | 2605篇 |
2012年 | 1637篇 |
2011年 | 2031篇 |
2010年 | 1720篇 |
2009年 | 1927篇 |
2008年 | 1689篇 |
2007年 | 1631篇 |
2006年 | 1575篇 |
2005年 | 1356篇 |
2004年 | 1215篇 |
2003年 | 1145篇 |
2002年 | 970篇 |
2001年 | 572篇 |
2000年 | 353篇 |
1999年 | 516篇 |
1998年 | 705篇 |
1997年 | 780篇 |
1996年 | 701篇 |
1995年 | 633篇 |
1994年 | 473篇 |
1993年 | 386篇 |
1992年 | 298篇 |
1991年 | 288篇 |
1990年 | 265篇 |
1989年 | 219篇 |
1988年 | 179篇 |
1987年 | 154篇 |
1986年 | 160篇 |
1985年 | 178篇 |
1984年 | 138篇 |
1983年 | 119篇 |
1982年 | 110篇 |
1981年 | 124篇 |
1980年 | 83篇 |
1979年 | 97篇 |
1978年 | 71篇 |
1977年 | 75篇 |
1976年 | 77篇 |
1972年 | 95篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
111.
Christian J. Sauder Cheryl X. Zhang Malen A. Link W. Paul Duprex Kathryn M. Carbone Steven A. Rubin 《Vaccine》2009
The recent global resurgence of mumps has drawn attention to the continued need for robust mumps immunization programs. Unfortunately, some vaccines derived from inadequately attenuated vaccine strains of mumps virus have caused meningitis in vaccinees, leading to withdrawal of certain vaccine strains from the market, public resistance to vaccination, or in some cases, cessation of national mumps vaccination programs. The most widely implicated mumps vaccine in cases of postvaccination meningitis is derived from the Urabe AM9 strain, which remains in use in some countries. The Urabe AM9 vaccine virus has been shown to exhibit a considerable degree of nucleotide and amino acid heterogeneity. Some studies have specifically implicated variants containing a lysine residue at amino acid position 335 in the hemagglutinin-neuraminidase (HN) protein with neurotoxicity, whereas a glutamic acid residue at this position was associated with attenuation. To test this hypothesis we generated two modified Urabe AM9 cDNA clones coding either for a lysine or a glutamic acid at position 335 in the HN gene. The two viruses were rescued by reverse genetics and characterized in vitro and in vivo. Both viruses exhibited similar growth kinetics in neuronal and non-neuronal cell lines and were of similar neurotoxicity when tested in rats, suggesting that amino acid 335 is not a crucial determinant of Urabe AM9 growth or neurovirulence. 相似文献
112.
Many people die in emergency departments (EDs) across the United States from sudden illnesses or injuries, an exacerbation of a chronic disease, or a terminal illness. Frequently, patients and families come to the ED seeking lifesaving or life-prolonging treatment. In addition, the ED is a place of transition-patients usually are transferred to an inpatient unit, transferred to another hospital, or discharged home. Rarely are patients supposed to remain in the ED. Currently, there is an increasing amount of literature related to end-of-life care. However, these end-of-life care models are based on chronic disease trajectories and have difficulty accommodating sudden-death trajectories common in the ED. There is very little information about end-of-life care in the ED. This article explores ED culture and characteristics, and examines the applicability of current end-of-life care models. 相似文献
113.
114.
GILBERTE A. VANSINTEJAN RN MPH EDD PETER J. PURDY MPH 《Journal of obstetric, gynecologic, and neonatal nursing : JOGNN / NAACOG》1986,15(6):492-495
Since the mid-1970s, the Margaret Sanger Center of Planned Parenthood of New York City has prepared nurses and nurse midwives from less developed countries to be family-planning nurse practitioners. These nurse practitioners then provide services to patients, train other staff, and manage integrated family-planning clinics. More than 120 nurses and nurse midwives have arrived in groups of 10 at the Sanger Center, with 72 attending since 1981. Each course lasts 10 weeks. The core curriculum provides trainees with skills in women's health care including contraception, in training and advocacy, and in management of clinics. Whether, in the current period of scarce resources, cross-cultural training programs of this type remain a worthwhile investment, and if so, which of their components are most important to this success, is assessed. 相似文献
115.
116.
The most common cause of illness in infancy and childhood is acute infection of the respiratory tract. Several recent studies have reported that life-threatening respiratory disease in infancy, such as pneumonia and bronchiolitis, is directly related to the smoking habits of parents. The effects of smoking are more hazardous to youngsters because babies and young children breathe more rapidly than adults. Because of this higher breathing rate, they inhale more air—and more pollution—in comparison to their total body weight. The harmful effects of cigarette smoking on infants and children and recommendations for specific interventions to minimize or eliminate this health hazard are discussed. 相似文献
117.
William A. Marston MD ; Anton Usala MD ; Ronald S. Hill PhD ; Robert Mendes MD ; Mary-Ann Minsley RN 《Wound repair and regeneration》2005,13(3):243-247
A novel injectable scaffolding matrix (E-Matrix) has been developed to accelerate wound healing in diabetic foot ulcers. This porcine collagen-derived matrix is designed to mimic tertiary embryonic connective tissue and to stimulate fetal wound repair mechanisms including angiogenesis. In vitro and animal studies have indicated a beneficial effect on tissue growth and an acceptable safety profile. In this report, we describe the initial use of this product in a pilot study of six humans with chronic nonhealing diabetic foot ulcers. A dramatic initial response to injection was seen, with an average wound size reduction of 72% 2 weeks after injection. Randomized trials are underway to define the potential benefit of this new treatment modality for diabetic foot ulcers. 相似文献
118.
119.
Depressive Symptoms and Associated Factors in Children With Attention Deficit Hyperactivity Disorder
Nancy LeBlanc PhD RN Diane Morin PhD RN 《Journal of child and adolescent psychiatric nursing》2004,17(2):49-55
PROBLEM: To compare depressive symptoms in children with attention deficit hyperactivity disorder (ADHD) to those in healthy children, and to explore the influence of individual and family factors on level of depression. METHODS: Individual interviews with 68 children, ages 7 to 12 years, in order to complete the Children's Depression Inventory. FINDINGS: Children with ADHD reported significantly more depressive symptoms than did children without ADHD; 14.7% of children with ADHD reached the threshold of a 19 point score, which suggests clinical depression. No significant effects of individual and family factors on level of depression were found. CONCLUSIONS: Children with ADHD are more inclined to experience depressive symptoms than are healthy children. To plan appropriate interventions, nurses evaluating and working with children with ADHD should always consider a possible coexistence of depressive symptoms. 相似文献