全文获取类型
收费全文 | 4138篇 |
免费 | 419篇 |
国内免费 | 2篇 |
专业分类
耳鼻咽喉 | 63篇 |
儿科学 | 70篇 |
妇产科学 | 69篇 |
基础医学 | 590篇 |
口腔科学 | 61篇 |
临床医学 | 357篇 |
内科学 | 813篇 |
皮肤病学 | 40篇 |
神经病学 | 460篇 |
特种医学 | 173篇 |
外科学 | 582篇 |
综合类 | 72篇 |
一般理论 | 1篇 |
预防医学 | 623篇 |
眼科学 | 46篇 |
药学 | 260篇 |
肿瘤学 | 279篇 |
出版年
2022年 | 35篇 |
2021年 | 47篇 |
2019年 | 59篇 |
2018年 | 66篇 |
2017年 | 52篇 |
2016年 | 62篇 |
2015年 | 57篇 |
2014年 | 95篇 |
2013年 | 119篇 |
2012年 | 154篇 |
2011年 | 175篇 |
2010年 | 109篇 |
2009年 | 80篇 |
2008年 | 159篇 |
2007年 | 178篇 |
2006年 | 158篇 |
2005年 | 168篇 |
2004年 | 144篇 |
2003年 | 153篇 |
2002年 | 151篇 |
2001年 | 102篇 |
2000年 | 111篇 |
1999年 | 114篇 |
1998年 | 50篇 |
1997年 | 40篇 |
1996年 | 52篇 |
1995年 | 52篇 |
1994年 | 40篇 |
1993年 | 40篇 |
1992年 | 90篇 |
1991年 | 100篇 |
1990年 | 93篇 |
1989年 | 88篇 |
1988年 | 73篇 |
1987年 | 83篇 |
1986年 | 80篇 |
1985年 | 71篇 |
1984年 | 57篇 |
1983年 | 63篇 |
1982年 | 34篇 |
1981年 | 36篇 |
1979年 | 68篇 |
1978年 | 41篇 |
1977年 | 39篇 |
1976年 | 43篇 |
1975年 | 37篇 |
1973年 | 42篇 |
1972年 | 32篇 |
1971年 | 36篇 |
1968年 | 36篇 |
排序方式: 共有4559条查询结果,搜索用时 15 毫秒
1.
Quality of life in stroke survivor–caregiver dyads: a new conceptual framework and longitudinal study protocol
下载免费PDF全文
![点击此处可从《Journal of advanced nursing》网站下载免费的PDF全文](/ch/ext_images/free.gif)
2.
Jennifer J. Schoch Reesa L. Monir Kerrie G. Satcher Jessica Harris Eric Triplett Josef Neu 《Pediatric dermatology》2019,36(5):574-580
Recent focus on the neonatal intestinal microbiome has advanced our knowledge of the complex interplay between the intestinal barrier, the developing immune system, and commensal and pathogenic organisms. Despite the parallel role of the infant skin in serving as both a barrier and an interface for priming the immune system, large gaps exist in our understanding of the infantile cutaneous microbiome. The skin microbiome changes and matures throughout infancy, becoming more diverse and developing the site specificity known to exist in adults. Delivery method initially determines the composition of the cutaneous microbiome, though this impact appears transient. Cutaneous microbes play a critical role in immune system development, particularly during the neonatal period, and microbes and immune cells have closely intertwined, reciprocal effects. The unique structure of newborn skin influences cutaneous microbial colonization and the development of dermatologic pathology. The development of the infantile skin barrier and cutaneous microbiome contributes to future skin pathology. Atopic dermatitis flares and seborrheic dermatitis have been linked to dysbiosis, while erythema toxicum neonatorum is an immune response to the establishment of normal bacterial skin flora. Physicians who care for infants should be aware of the impact of the infantile skin microbiome and its role in the development of pathology. A better understanding of the origin and evolution of the skin microbiome will lead to more effective prevention and treatment of pediatric skin disease. 相似文献
3.
4.
5.
6.
Henry F. Vaughan 《American journal of public health》1929,19(5):546-548
7.
Efficient high-frequency body coil for high-field MRI. 总被引:1,自引:0,他引:1
J T Vaughan G Adriany C J Snyder J Tian T Thiel L Bolinger H Liu L DelaBarre K Ugurbil 《Magnetic resonance in medicine》2004,52(4):851-859
The use of body coils is favored for homogeneous excitation, and such coils are often paired with surface coils or arrays for sensitive reception in many MRI applications. While the body coil's physical size and resultant electrical length make this circuit difficult to design for any field strength, recent efforts to build efficient body coils for applications at 3T and above have been especially challenging. To meet this challenge, we developed an efficient new transverse electromagnetic (TEM) body coil and demonstrated its use in human studies at field strengths up to 4 T. Head, body, and breast images were acquired within peak power constraints of <8 kW. Bench studies indicate that these body coils are feasible to 8 T. RF shimming was used to remove a high-field-related cardiac imaging artifact in these preliminary studies. P41RR13230 相似文献
8.
9.
10.
Monitoring the performance of the health care delivery system is a public health function that becomes more important as organized delivery systems begin to take control over larger portions of the medical care market. The study reported here illustrates how standard medical care epidemiology can be applied to analysis of health care system performance to aid governmental efforts to monitor new developments in the medical care market. In order to evaluate the efficiency of hospital care delivered in Iowa, age- and sex-adjusted population admission rates for five common procedures were generated for all 99 counties. The five common procedures were defined as follows: hernia, tonsillectomy, cesarean section, hysterectomy, and cholecystectomy. In addition, variations in 11 ambulatory care-sensitive condition rates were analyzed. Residents of at least 15 counties were at significantly greater than average risk of receiving each of the common procedures (chi 2 test, P < 0.05). Counties that had a high rate for one procedure tended to have a high rate for at least one other procedure. Several counties had more than twice the mean rate. Even a 10% reduction, when added across all five common procedures. amounts to well over 2,000 hospitalizations avoided. It is assumed that reductions would be concentrated in high-rate counties. If a 50% reduction could be achieved in only part of the ambulatory care-sensitive procedures, more than 10,000 hospital admissions could be avoided. 相似文献