全文获取类型
收费全文 | 9385篇 |
免费 | 923篇 |
国内免费 | 16篇 |
专业分类
耳鼻咽喉 | 264篇 |
儿科学 | 301篇 |
妇产科学 | 260篇 |
基础医学 | 1106篇 |
口腔科学 | 262篇 |
临床医学 | 1103篇 |
内科学 | 2006篇 |
皮肤病学 | 247篇 |
神经病学 | 698篇 |
特种医学 | 417篇 |
外科学 | 1581篇 |
综合类 | 169篇 |
一般理论 | 8篇 |
预防医学 | 827篇 |
眼科学 | 156篇 |
药学 | 351篇 |
中国医学 | 6篇 |
肿瘤学 | 562篇 |
出版年
2021年 | 127篇 |
2020年 | 104篇 |
2019年 | 85篇 |
2018年 | 143篇 |
2017年 | 128篇 |
2016年 | 138篇 |
2015年 | 153篇 |
2014年 | 194篇 |
2013年 | 308篇 |
2012年 | 328篇 |
2011年 | 334篇 |
2010年 | 228篇 |
2009年 | 205篇 |
2008年 | 307篇 |
2007年 | 369篇 |
2006年 | 380篇 |
2005年 | 372篇 |
2004年 | 349篇 |
2003年 | 362篇 |
2002年 | 338篇 |
2001年 | 279篇 |
2000年 | 296篇 |
1999年 | 257篇 |
1998年 | 90篇 |
1997年 | 85篇 |
1996年 | 96篇 |
1995年 | 95篇 |
1993年 | 91篇 |
1992年 | 249篇 |
1991年 | 247篇 |
1990年 | 228篇 |
1989年 | 252篇 |
1988年 | 204篇 |
1987年 | 216篇 |
1986年 | 210篇 |
1985年 | 198篇 |
1984年 | 178篇 |
1983年 | 120篇 |
1982年 | 93篇 |
1981年 | 82篇 |
1979年 | 144篇 |
1978年 | 107篇 |
1976年 | 86篇 |
1975年 | 82篇 |
1974年 | 99篇 |
1973年 | 154篇 |
1972年 | 89篇 |
1971年 | 102篇 |
1970年 | 111篇 |
1969年 | 98篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
1.
2.
Martin F. Shapiro 《Journal of general internal medicine》2015,30(10):1392-1393
3.
4.
Timothy C. Evans MD PhD ; Keren H. Wick PhD ; Douglas M. Brock PhD ; Douglas C. Schaad PhD ; Ruth Ballweg MPA PA-C 《The Journal of rural health》2006,22(3):212-219
CONTEXT: The physician assistant profession has been moving toward requiring master's degrees for new practitioners, but some argue this could change the face of the discipline. PURPOSE: To see if there is an association between physician assistants' academic degrees and practice in primary care, in rural areas, and with the medically underserved. METHODS: Surveys were sent to 880 graduates of the first 32 University of Washington physician assistant classes through 2000. Respondents noted their academic degree at program entry and the highest degree attained at any time up to the time of survey. Relationships between practice characteristics and academic degree levels were tested by unadjusted odds ratios and logistic regression after controlling for year of graduation and sex. RESULTS: Of the 478 respondents, 54% worked in primary care, about 30% practiced in nonmetropolitan communities, and 42% reported providing care for the medically underserved. Respondents with no degree (33% of total at entry, 24% at survey) were significantly more likely than degree holders to work in primary care and nonmetropolitan areas. Respondents with no degree at program entry were significantly more likely, and those with no degree at the time of the survey were marginally more likely, to self-report work with the medically underserved. CONCLUSION: Respondents with no academic degree are significantly more likely to demonstrate a commitment to primary, rural, and underserved health care. These findings may inform the national debate about the impact of required advanced degrees on the practice patterns of nonphysician providers. 相似文献
5.
Edward R. Westrick MS Allan P. Shapiro PhD Peter E. Nathan PhD John Brick PhD 《Alcoholism, clinical and experimental research》1988,12(4):531-533
The present study demonstrates that alcohol-induced memory impairment can be attenuated by pretreatment with an oral tryptophan supplementation. These results provide support for the role of a brain serotonin deficit in this impairment and highlight the impact a dietary manipulation can have on a complex behavioral process. 相似文献
6.
7.
H Hultgren P Peduzzi W Shapiro D van Heeckeren 《Progress in cardiovascular diseases》1986,28(4):279-284
8.
Christopher G. Acker Richard Flick Ron Shapiro Velma P. Scantlebury Mark L. Jordan Carlos Vivas Arthur Greenberg John P. Johnson 《American journal of transplantation》2002,2(1):57-61
Delayed graft function (DGF) in cadaver kidney transplants is a common problem and is often due to acute tubular necrosis (ATN). DGF in transplants may have a deleterious effect on long-term graft survival. Since thyroid hormone has been shown to hasten recovery from ATN in experimental models, we designed a trial to determine if a defined course of triiodothyronine (T3) would improve the short- or long-term outcome of patients with DGF in cadaveric transplants. A prospective, randomized, placebo controlled, double blind trial of T3 was carried out in patients with DGF in cadaveric renal transplants. End-points were percentage requiring dialysis, percentage recovering function, time to recovery and length of hospital stay. Long-term outcomes were percentage grafts functioning at 1 year and mean serum creatinine at 1 year. Forty-four patients were randomized to receive either T3 or placebo. Three patients were dropped from each group when early biopsies disclosed that DGF was due to rejection. The groups were well matched by age, cold ischemia time of the graft, and percentage reactivity to a random panel of antigens. Baseline thyroid function studies, including T3, reverse T3 (rT3), and thyroid stimulating hormone (TSH) levels, were similar between the two groups and typical of 'euthyroid-sick syndrome'. T3 had no effect on percentage requiring dialysis, time to recovery, percentage recovering function, or length of stay. At 1 year follow-up, graft function was similar in both groups and significantly lower than that seen in patients with good initial function. Thyroid hormone, given early in the course of DGF in cadaver kidney recipients, had no effect on the course of DGF. Long-term graft function is impaired in patients who experience post-transplant DGF compared to those who have good initial function. 相似文献
9.
Health care use among young children in day care. Results in a randomized trial of early intervention 总被引:2,自引:0,他引:2
Exposure of young children to group day-care settings increases the risk of illness and may result in higher use of medical care. These observations raise concerns that the use of such settings for early intervention programs for low-birth-weight infants may increase the already high burden of medical care costs incurred by these children and their families. To address the question of medical care use associated with center-based care, we examined the hospital-based and ambulatory care reported for participants of the Infant Health and Development Program. This project is a multisite randomized trial of an early intervention program for preterm low-birth-weight infants with an intervention including 2 years of center-based care. The Intervention group did not differ in hospital-based care and averaged only two more physicians' visits over the 3-year observation period than the comparison group. We conclude that early intervention programs involving high-quality group care are not accompanied by substantial increases in health care use. 相似文献
10.
Current status of research activity in American child and adolescent psychiatry: Part I 总被引:1,自引:0,他引:1
T Shapiro D Mrazek H A Pincus 《Journal of the American Academy of Child and Adolescent Psychiatry》1991,30(3):443-448
A survey of research activity of American academic child psychiatrists was completed in February, 1989. The survey demonstrated an increase in research activity since the 1983 report in the Current Status of Child Psychiatry. A definition of a researcher was derived from a study of internists and general psychiatrists and applied to the 488 respondents (78.5% of sample), and it was found that males outnumber females and that researchers contribute significantly more to the literature and education than nonresearchers. Early research exposure and mentoring are important influences on a research career. Recommendations by researchers for future training of researchers are presented. Periodic surveys are encouraged. 相似文献