全文获取类型
收费全文 | 6590篇 |
免费 | 864篇 |
国内免费 | 16篇 |
专业分类
耳鼻咽喉 | 28篇 |
儿科学 | 172篇 |
妇产科学 | 90篇 |
基础医学 | 857篇 |
口腔科学 | 157篇 |
临床医学 | 732篇 |
内科学 | 1515篇 |
皮肤病学 | 59篇 |
神经病学 | 487篇 |
特种医学 | 584篇 |
外科学 | 947篇 |
综合类 | 133篇 |
一般理论 | 2篇 |
预防医学 | 702篇 |
眼科学 | 59篇 |
药学 | 544篇 |
中国医学 | 7篇 |
肿瘤学 | 395篇 |
出版年
2021年 | 99篇 |
2020年 | 50篇 |
2019年 | 80篇 |
2018年 | 118篇 |
2017年 | 91篇 |
2016年 | 116篇 |
2015年 | 106篇 |
2014年 | 154篇 |
2013年 | 194篇 |
2012年 | 262篇 |
2011年 | 308篇 |
2010年 | 201篇 |
2009年 | 197篇 |
2008年 | 245篇 |
2007年 | 252篇 |
2006年 | 281篇 |
2005年 | 245篇 |
2004年 | 255篇 |
2003年 | 237篇 |
2002年 | 245篇 |
2001年 | 200篇 |
2000年 | 224篇 |
1999年 | 185篇 |
1998年 | 132篇 |
1997年 | 110篇 |
1996年 | 121篇 |
1995年 | 113篇 |
1994年 | 95篇 |
1993年 | 100篇 |
1992年 | 133篇 |
1991年 | 120篇 |
1990年 | 123篇 |
1989年 | 155篇 |
1988年 | 138篇 |
1987年 | 150篇 |
1986年 | 152篇 |
1985年 | 127篇 |
1984年 | 120篇 |
1983年 | 91篇 |
1982年 | 79篇 |
1981年 | 81篇 |
1980年 | 53篇 |
1979年 | 79篇 |
1978年 | 50篇 |
1977年 | 65篇 |
1976年 | 47篇 |
1975年 | 50篇 |
1974年 | 54篇 |
1972年 | 62篇 |
1970年 | 53篇 |
排序方式: 共有7470条查询结果,搜索用时 31 毫秒
991.
Rapid presumptive identification of Citrobacter diversus as an aid in controlling infections.
下载免费PDF全文
![点击此处可从《Journal of clinical microbiology》网站下载免费的PDF全文](/ch/ext_images/free.gif)
During an outbreak of neonatal meningitis caused by kanamycin-resistant Citrobacter diversus, a field procedure for presumptive identification of the organism was evaluated, and using it resulted in the early recognition of patients colonized by the epidemic strain of C. diversus. Rectal and nasopharyngeal specimens were plated and incubated on MacConkey agar containing 10 micrograms of kanamycin per ml. After 18 h of incubation, lactose-nonfermenting colonies present on the selective medium were picked and identified 8 h later with the following biochemical tests: indole, adonitol, dulcitol, citrate, and triple sugar iron agar. This presumptive identification of C. diversus was later confirmed for all cases by conventional testing with a complete set of biochemicals. In 1 week, 253 specimens from patients were processed with this technique, and 49 strains of C. diversus were identified. The rapid identification of C. diversus and transfer of carriers into appropriate cohorts resulted in a 64% reduction in the prevalence of colonization. 相似文献
992.
Small intestinal structure and passive permeability in systemic sclerosis. 总被引:1,自引:0,他引:1
下载免费PDF全文
![点击此处可从《Gut》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Seventeen patients with proven systemic sclerosis had a peroral jejunal biopsy performed. Four biopsies were regarded as showing abnormalities, which were mostly confined to the deeper structures, although in two there was a minimal degree of villous atrophy without epithelial cell changes. Passive intestinal permeability, as assessed by the cellobiose/mannitol test, was normal in all patients. In contrast, seven patients had a low xylose test result, which in five of them could be accounted for by impaired renal function, small intestinal bacterial contamination, or altered gastrointestinal transit. These results indicate that passive intestinal permeability is unaltered in systemic sclerosis, and that malabsorption, when it occurs, is caused by other factors. 相似文献
993.
Fifty-five patients with myeloma who had relapsed on or were resistant to melphalan and/or cyclophosphamide with prednisone received vincristine, carmustine, doxorubicin, and prednisone (VBAP) plus cisplatin and bleomycin at 21-day intervals. Eighteen (32.7%) patients responded. The response rate was 38.5% (15 responses among 39 patients) in relapsing patients. Three (18.8%) of 16 patients with resistant myeloma responded. Granulocytopenia was the most frequent toxic effect, and was severe in 12 (22%) patients. Severe thrombocytopenia occurred in seven (13%) patients and severe nausea and vomiting occurred in eight (15%). One patient with previously normal renal function developed renal failure on this regimen. The median survival (100 weeks) in those patients responding to treatment was significantly longer than that in patients not responding (25 weeks; P = 0.001). VBAP plus cisplatin and bleomycin was at least as effective as VBAP but had greater toxicity, expense, and inconvenience; it therefore is not preferable to VBAP. 相似文献
994.
995.
Murine lupus--an overview 总被引:3,自引:0,他引:3
F J Dixon 《Arthritis and rheumatism》1982,25(7):721-725
996.
R A Sturge J T Scott E B Hamilton S P Liyanage A S Dixon J Davies C Engler 《Annals of the rheumatic diseases》1977,36(1):80-82
Naproxen 750 mg as a single dose followed by 250 mg three times daily has been compared with phenylbutazone 200 mg four times daily for 48 hours followed by 200 mg three times daily for treatment of acute gout in an open study on 41 patients. The drugs were equally effective with few and relatively mild side effects. Naproxen is a useful alternative agent for the treatment of acute gout. 相似文献
997.
H A Bird P Taylor P Le Gallez J Hill J S Dixon D B Galloway V Wright 《Current medical research and opinion》1984,9(5):353-357
Faecal blood loss arising from Ro 21-5521, a novel non-steroidal anti-inflammatory agent with a long plasma half-life of about 41 hours, was evaluated in a double-blind crossover study against matched placebo in 12 volunteers. After a 1-week run-in period to determine baseline values, subjects were allocated at random to receive either 250 mg Ro 21-5521 per day or placebo for 2 weeks before being crossed over to the alternative treatment for 2 weeks. They were then followed-up for a further 2 weeks. Blood loss was calculated from 51Chromium tagged red blood cells in stools collected for a 96-hour period during each week of the study. Plasma levels of Ro 21-5521 were also measured twice weekly throughout the study. The results showed that with a drug of this long half-life, faecal blood loss may continue for at least 4 weeks after cessation of trial therapy of 2 weeks. It is recommended that in the evaluation of faecal blood loss resulting from drugs with a long half-life, a parallel group study, each group receiving only one drug (or one drug crossed against placebo), is the study design of choice. 相似文献
998.
Several recent articles published in the popular press have presented contrasting accounts of the emerging social phenomenon of latchkey children. In this paper, we examine available empirical evidence in light of a contextual model of human development and, on this basis, offer preliminary suggestions for the care of latchkey children.The authors wish to express their appreciation to James Garbarino for his critical reading of an earlier version of this article. 相似文献
999.
Over the past 20 years there has been a concerted effort to define and limit the impacts of anthropogenic contaminants in aquatic environments. There are essentially two philosophies that can be employed to regulate and to assess the effects of toxic chemicals in these systems. The first is the water quality objectives research. Under this protocol, laboratory research is used to set an objective, the concentration of a substance or condition that is considered to have no effect on the organisms in an aquatic environment based on a review of the pertinent research. The second approach, environmental health assessment, uses the in situ responses of free-living organisms in contaminated environments to determine the overall impacts of the environment on those organisms. In this review paper we will attempt to compare and contrast the advantages and disadvantages of the two approaches, and to outline a system whereby they can be used together to enhance our degree of confidence in legislation directed at reducing contaminant impacts. © by John Wiley & Sons, Inc. 相似文献
1000.