全文获取类型
收费全文 | 10001篇 |
免费 | 265篇 |
国内免费 | 28篇 |
专业分类
耳鼻咽喉 | 95篇 |
儿科学 | 400篇 |
妇产科学 | 2088篇 |
基础医学 | 1094篇 |
口腔科学 | 457篇 |
临床医学 | 1026篇 |
内科学 | 1188篇 |
皮肤病学 | 164篇 |
神经病学 | 564篇 |
特种医学 | 492篇 |
外科学 | 1041篇 |
综合类 | 88篇 |
一般理论 | 1篇 |
预防医学 | 814篇 |
眼科学 | 216篇 |
药学 | 307篇 |
中国医学 | 48篇 |
肿瘤学 | 211篇 |
出版年
2018年 | 80篇 |
2017年 | 97篇 |
2016年 | 57篇 |
2015年 | 76篇 |
2014年 | 107篇 |
2013年 | 340篇 |
2012年 | 139篇 |
2011年 | 213篇 |
2010年 | 182篇 |
2009年 | 334篇 |
2008年 | 314篇 |
2007年 | 238篇 |
2006年 | 276篇 |
2005年 | 274篇 |
2004年 | 237篇 |
2003年 | 229篇 |
2002年 | 208篇 |
2001年 | 115篇 |
2000年 | 113篇 |
1999年 | 325篇 |
1998年 | 305篇 |
1997年 | 354篇 |
1996年 | 368篇 |
1995年 | 319篇 |
1994年 | 284篇 |
1993年 | 211篇 |
1992年 | 223篇 |
1991年 | 238篇 |
1990年 | 180篇 |
1989年 | 166篇 |
1988年 | 159篇 |
1987年 | 135篇 |
1986年 | 173篇 |
1985年 | 146篇 |
1984年 | 123篇 |
1983年 | 155篇 |
1982年 | 107篇 |
1981年 | 101篇 |
1980年 | 122篇 |
1979年 | 106篇 |
1978年 | 75篇 |
1977年 | 106篇 |
1976年 | 110篇 |
1975年 | 106篇 |
1974年 | 78篇 |
1973年 | 78篇 |
1972年 | 51篇 |
1971年 | 50篇 |
1970年 | 54篇 |
1922年 | 60篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
5.
Socioeconomic determinants of health related quality of life in childhood and adolescence: results from a European study . von Rueden , U. , Gosch , A. , Rajmil , L. , Bisegger , C. , Ravens-Sieberer , U. , the European KIDSCREEN group ( 2006 ) Journal of Epidemiology and Community Health , 60 , 130 – 135 . 相似文献
6.
7.
Anorectal function in the solitary rectal ulcer syndrome 总被引:8,自引:6,他引:2
Nigel R. Womack F.R.C.S. Professor Norman S. Williams M.S. John H. Holmfield Mist John F. Morrison Ph.d. 《Diseases of the colon and rectum》1987,30(5):319-323
The anorectal function of nine patients with solitary rectal ulcer syndrome (SRUS) (5 F: 4 M, median age, 27 (range, 19–41
years) and nine control subjects (5 F: 4 M, median age, 47 (35–66)P<0.01) has been investigated by a new technique that radiologically visualizes the anorectum during voiding of a semisolid
contrast medium, while simultaneously measuring intrarectal pressure and anal sphincter EMG activity. A degree of rectal prolapse
was demonstrated in eight of the SRUS patients; six of these lesions were clinically occult. Abnormal failure of the anal
sphincter to relax on voiding was present in seven of the SRUS patients. These abnormalities resulted in the SRUS patients
requiring a greater increase in intrarectal pressure (median, 100 cm water) to void than the control subjects (median, 65
cm water,P<0.01). This combination of high intrarectal pressure and rectal prolapse during straining seems to be the cause of SRUS
This work was supported by a grant from the Medical Research Council. 相似文献
8.
Why is the age-standardized incidence of low-trauma fractures rising in many elderly populations? 总被引:4,自引:0,他引:4
Pekka Kannus Seppo Niemi Jari Parkkari Mika Palvanen Ari Heinonen Harri Siev?nen Teppo J?rvinen Karim Khan Markku J?rvinen 《Journal of bone and mineral research》2002,17(8):1363-1367
Low-trauma fractures of elderly people are a major public health burden worldwide, and as the number and mean age of older adults in the population continue to increase, the number of fractures is also likely to increase. Epidemiologically, however, an additional concern is that, for unknown reasons, the age-standardized incidence (average individual risk) of fracture has also risen in many populations during the recent decades. Possible reasons for this rise include a birth cohort effect, deterioration in the average bone strength by time, and increased average risk of (serious) falls. Literature provides evidence that the rise is not due to a birth cohort effect, whereas no study shows whether bone fragility has increased during this relatively short period of time. This osteoporosis hypothesis could, however, be tested if researchers would now repeat the population measurements of bone mass and density that were made in the late 1980s and the 1990s. If such studies proved that women's and men's age-standardized mean values of bone mass and density have declined over time, the osteoporosis hypothesis would receive scientific support. The third explanation is based on the hypothesis that the number and/or severity of falls has risen in elderly populations during the recent decades. Although no study has directly tested this hypothesis, a great deal of indirect epidemiologic evidence supports this contention. For example, the age-standardized incidence of fall-induced severe head injuries, bruises and contusions, and joint distortions and dislocations has increased among elderly people similarly to the low-trauma fractures. The fall hypothesis could also be tested in the coming years because the 1990s saw many research teams reporting age- and sex-specific incidences of falling for elderly populations, and the same could be done now to provide data comparing the current incidence rates of falls with the earlier ones. 相似文献
9.
Gordon J. Harris Ph.D. Instructor Jonathan M. Links Ph.D. Associate Professor Godfrey D. Pearlson M.B. B.S. Director Edwaldo E. Camargo M.D. Associate Professor 《Psychiatry research》1991,40(3):167-180
We developed a semiautomatic method termed “cortical circumferential profiling” for objective analysis of cerebral cortex function in emission tomographic neuroimaging studies. This method treats cortex as a continuous ring near the outer brain edge. A computer algorithm samples the cortex at 60 contiguous, equiangular locations, using 1-cm2 samples. These values are plotted as a function of cortical angle to produce the cortical circumferential profile. This method was used in a study of regional cerebral perfusion in 15 patients with Alzheimer's disease and 8 elderly control subjects using N-isopropyl [I-123]-iodoamphetamine. Cortical circumferential profiling decreases variability, examines the entire cortex within slices at preselected levels above the orbital-meatal line, and facilitates intrasubject and intersubject comparisons. 相似文献
10.
Fulminant hepatic failure associated with aplastic anaemia after treatment with danazol. Case report
T. NAKAJIMA Consultant N. MIZUSHIMA Registrar H. MATSUDA Registrar M. MATSUMOTO Registrar K. TAMAKOSHI Senior Registrar H. ISHII Consultant S. MORIOKA Consultant K. KANAI Associate Professor Y. IKEDA Senior Lecturer T. TERAO Associate Professor 《BJOG : an international journal of obstetrics and gynaecology》1986,93(9):1013-1015