全文获取类型
收费全文 | 49760篇 |
免费 | 3843篇 |
国内免费 | 118篇 |
专业分类
耳鼻咽喉 | 393篇 |
儿科学 | 2119篇 |
妇产科学 | 1471篇 |
基础医学 | 6540篇 |
口腔科学 | 520篇 |
临床医学 | 6768篇 |
内科学 | 9289篇 |
皮肤病学 | 766篇 |
神经病学 | 4899篇 |
特种医学 | 1131篇 |
外国民族医学 | 38篇 |
外科学 | 4825篇 |
综合类 | 519篇 |
一般理论 | 99篇 |
预防医学 | 7215篇 |
眼科学 | 674篇 |
药学 | 2660篇 |
中国医学 | 86篇 |
肿瘤学 | 3709篇 |
出版年
2024年 | 53篇 |
2023年 | 456篇 |
2022年 | 624篇 |
2021年 | 1546篇 |
2020年 | 929篇 |
2019年 | 1456篇 |
2018年 | 1704篇 |
2017年 | 1239篇 |
2016年 | 1306篇 |
2015年 | 1392篇 |
2014年 | 1935篇 |
2013年 | 2829篇 |
2012年 | 4003篇 |
2011年 | 4112篇 |
2010年 | 2180篇 |
2009年 | 1900篇 |
2008年 | 3434篇 |
2007年 | 3390篇 |
2006年 | 3132篇 |
2005年 | 3066篇 |
2004年 | 2774篇 |
2003年 | 2472篇 |
2002年 | 2333篇 |
2001年 | 345篇 |
2000年 | 219篇 |
1999年 | 335篇 |
1998年 | 468篇 |
1997年 | 346篇 |
1996年 | 300篇 |
1995年 | 309篇 |
1994年 | 265篇 |
1993年 | 232篇 |
1992年 | 157篇 |
1991年 | 175篇 |
1990年 | 149篇 |
1989年 | 118篇 |
1988年 | 121篇 |
1987年 | 95篇 |
1986年 | 109篇 |
1985年 | 122篇 |
1984年 | 131篇 |
1983年 | 113篇 |
1982年 | 126篇 |
1981年 | 161篇 |
1980年 | 110篇 |
1979年 | 77篇 |
1978年 | 60篇 |
1977年 | 64篇 |
1976年 | 61篇 |
1974年 | 58篇 |
排序方式: 共有10000条查询结果,搜索用时 955 毫秒
61.
Tolerance of ocular iontophoresis in healthy volunteers. 总被引:4,自引:0,他引:4
Thomas M Parkinson Elizabeth Ferguson Salvatore Febbraro Arash Bakhtyari Martin King Mohan Mundasad 《Journal of ocular pharmacology and therapeutics》2003,19(2):145-151
To evaluate ocular tolerance, healthy volunteers were iontophoresed transclerally using novel OcuPhor trade mark hydrogel drug delivery applicators filled with balanced salt solution. In this three-period crossover study in 24 male and female subjects, 16 subjects received 0 mA and two of the following DC currents: 0.1, 0.5., 1.0, 2.0, 3.0, or 4.0 mA for 20 min; 6 subjects received 3 mA for 20 min and 1.5 mA for 40 min (both equivalent to 60 mAmin total charge). Safety and tolerance were determined by subjective VAS and objective ophthalmic assessments. Subjects were evaluated before and up to 22 hr after dosing. The applicators were well-tolerated and no clinically significant changes in symptomology or in ophthalmic assessments were seen following exposure to 0-3.0 mA for 20 min or 1.5 mA for 40 min. At 4.0 mA 2 of 4 subjects reported a burning sensation under the applicator during dosing which resolved by 22 hr post-dose; superficial changes in fluorescein staining were observed at 1 hr, but not at 22 hr. The OcuPhor trade mark system has promise for noninvasive drug delivery to the eye. 相似文献
62.
We report a full-term male infant born to nonconsanguinous parents who had clinical features of Goldenhar syndrome and cri du chat syndrome. At birth, the infant was noted to have dysmorphic features with bilateral preauricular tags, rotated ears, bilateral epicanthic folds, a left epibulbar lipodermoid, and an accessory left nipple. After he was assessed for feeding difficulty and tachypnea, he was found to have esophageal atresia with tracheoesophageal fistula. In addition, he had a high-pitched, cat-like cry, characteristic of cri-du-chat syndrome. He also failed a hearing test. Chromosomal analysis and fluorescence in situ hybridisation studies showed an unbalanced karyotype with a terminal deletion of the segment p14 on the short arm of chromosome 5, which is consistent with the cri-du-chat locus. The association of Goldenhar syndrome and cri-du-chat syndrome in this patient suggests that the chromosome 5p14 locus may harbor a gene implicated with Goldenhar syndrome. 相似文献
63.
Priti Bandi M.S. Vilma E. Cokkinides Ph.D. J. Lee Westmaas Ph.D. Elizabeth Ward Ph.D. 《The Journal of adolescent health》2008,43(6):612-615
There is limited information on the relationship between parental practices that specifically discourage current cigarette smoking and adolescent cessation, and how this relationship varies by age. Among 1629 adolescent smokers, self-reported receipt of parental communication not to smoke was significantly and positively associated with readiness to quit. The strength and significance of this association decreased from early to middle adolescence and was not significant in late adolescence. 相似文献
64.
Sandra Urdaneta Hartmann Brian Wigdahl Elizabeth B Neely Cheston M Berlin Cara-Lynne Schengrund Hung-Mo Lin Mary K Howett 《Journal of human lactation》2006,22(1):61-74
Reduction of transmission of human immunodeficiency virus type 1 (HIV-1) through human milk is needed. Alkyl sulfates such as sodium dodecyl sulfate (SDS) are microbicidal against HIV-1 at low concentrations, have little to no toxicity, and are inexpensive. The authors have reported that treatment of HIV-1-infected human milk with < or = 1% (10 mg/mL) SDS for 10 minutes inactivates cell-free and cell-associated virus. The SDS can be removed with a commercially available resin after treatment without recovery of viral infectivity. In this article, the authors report results of selective biochemical analyses (ie, protein, immunoglobulins, lipids, cells, and electrolytes) of human milk subjected to SDS treatment and removal. The SDS treatment or removal had no significant effects on the milk components studied. Therefore, the use of alkyl sulfate microbicides to treat milk from HIV-1-positive women may be a simple, practical, and nutritionally sound way to prevent or reduce transmission of HIV-1 while still feeding with mother's own milk. 相似文献
65.
66.
Elizabeth Bass Robert R Campbell Dennis C Werner Audrey Nelson Tatjana Bulat 《Rehabilitation nursing》2004,29(6):215-220
Hip fractures among elderly people frequently result in permanent disabilities, nursing home placement, and death. The bulk of hip fracture research focuses on elderly women. Within the Veterans Health Administration (VHA), the majority of patients are men. There are no published national reports on hip fractures with large male samples, or on related inpatient mortality among veterans. This retrospective study of 13,546 veterans with hip fracture discharges from 1998-2002 found unadjusted mortality rates are higher in the VHA, compared with the general population. VHA patients tend to be older men in poor health who stay in the hospital longer Increased knowledge about the risks and outcomes associated with hip fractures in men could lead to improved primary and secondary injury-prevention programs. Rehabilitation nurses in acute care can be catalysts in proactively incorporating protective devices, screening for osteoporosis, and initiating lifestyle changes in their plans of care to optimize outcomes for hip fracture patients. 相似文献
67.
Elizabeth S. Allen David C. Atkins Donald H. Baucom Douglas K. Snyder Kristina Coop Gordon Shirley P. Glass 《Clinical psychology》2005,12(2):101-130
Extramarital involvement (EMI) occurs with high prevalence among couples in clinical and community settings, frequently resulting in considerable distress both to participants and their spouses. The field lacks a synthesized review of this literature. Without such a synthesis, it has been difficult for researchers and clinicians to have an understanding of what is and is not known about EMI. This article reviews the large and scattered EMI literature using a framework that encompasses multiple source domains across the temporal process of engaging in and responding to EMI. In addition, this review delineates conceptual and methodological limitations to previous work in this area and articulates directions for further research. 相似文献
68.
69.
John D Bisognano Joann Lindenfeld Elizabeth Hammond Lawrence S Zisman 《The Journal of heart and lung transplantation》2005,24(3):355-358
The etiology of cardiac allograft vasculopathy is not known, but may be preceded by both endothelial cell and smooth muscle dysfunction of the epicardial coronary arteries. We here report a case of acute, reversible coronary artery vasospasm which caused a myocardial infarction in a cardiac transplant recipient. The patient had a complex post-transplant course, including an episode of severe vascular rejection several months before this presentation. Interestingly, the event was captured in its early stages because the patient presented with chest pain: a rare event because of the denervation of the transplanted heart. Our ability to document the etiology of this patient's myocardial infarction supports the concept that cardiac allograft vasculopathy is a progressive disease that, in its early stages, may include a reversible component of abnormal vasoreactivity. 相似文献
70.
E McCauley G A Carlson R Calderon 《Journal of the American Academy of Child and Adolescent Psychiatry》1991,30(4):631-635
The question of whether somatic complaints are a significant feature of depression independent of anxiety was explored. Structured interview (Kiddie Schedule for Affective Disorders and Schizophrenia for School-Age Children) and Child Behavior Checklist data from depressed and nondepressed psychiatric controls were analyzed to explore the interaction of somatic complaints, anxiety, and depression. Seventy percent of the children who met criteria for depression also had significant somatic complaints in contrast to 34% of the controls. Findings revealed that frequency of somatic complaints increased with severity of depression regardless of coexisting anxiety. 相似文献