全文获取类型
收费全文 | 15183篇 |
免费 | 1440篇 |
国内免费 | 46篇 |
专业分类
耳鼻咽喉 | 98篇 |
儿科学 | 469篇 |
妇产科学 | 689篇 |
基础医学 | 1806篇 |
口腔科学 | 349篇 |
临床医学 | 2236篇 |
内科学 | 2857篇 |
皮肤病学 | 161篇 |
神经病学 | 1469篇 |
特种医学 | 698篇 |
外科学 | 1955篇 |
综合类 | 364篇 |
一般理论 | 26篇 |
预防医学 | 1458篇 |
眼科学 | 268篇 |
药学 | 885篇 |
中国医学 | 39篇 |
肿瘤学 | 842篇 |
出版年
2021年 | 140篇 |
2020年 | 123篇 |
2019年 | 164篇 |
2018年 | 202篇 |
2017年 | 209篇 |
2016年 | 211篇 |
2015年 | 284篇 |
2014年 | 329篇 |
2013年 | 538篇 |
2012年 | 607篇 |
2011年 | 735篇 |
2010年 | 466篇 |
2009年 | 453篇 |
2008年 | 688篇 |
2007年 | 757篇 |
2006年 | 782篇 |
2005年 | 756篇 |
2004年 | 748篇 |
2003年 | 751篇 |
2002年 | 752篇 |
2001年 | 254篇 |
2000年 | 249篇 |
1999年 | 325篇 |
1998年 | 299篇 |
1997年 | 285篇 |
1996年 | 265篇 |
1995年 | 259篇 |
1994年 | 188篇 |
1993年 | 192篇 |
1992年 | 265篇 |
1991年 | 227篇 |
1990年 | 183篇 |
1989年 | 218篇 |
1988年 | 240篇 |
1987年 | 202篇 |
1986年 | 200篇 |
1985年 | 209篇 |
1984年 | 207篇 |
1983年 | 152篇 |
1982年 | 187篇 |
1981年 | 169篇 |
1980年 | 154篇 |
1979年 | 147篇 |
1978年 | 158篇 |
1977年 | 133篇 |
1976年 | 98篇 |
1975年 | 117篇 |
1974年 | 111篇 |
1973年 | 101篇 |
1972年 | 80篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
1.
Boffa Joseph W. Tock Jamie L. Morabito Danielle M. Schmidt Norman B. 《Cognitive therapy and research》2022,46(5):1016-1029
Cognitive Therapy and Research - Despite interest in psychological inflexibility as a marker of suicide risk, no measure of psychological inflexibility specific to SI exists. The present study... 相似文献
2.
3.
4.
5.
6.
D Van Neste† RM Trüeb‡ 《Journal of the European Academy of Dermatology and Venereology》2006,20(5):578-583
BACKGROUND: Computer-assisted image analysis has been proposed for human hair growth studies. METHODS: The performances of Trichoscan, a commercially available automated system combining epiluminiscence microscopy with digital image analysis, developed for office-based hair growth measurements, have been evaluated comparatively on the same skin sites using standardized photographic equipment and calibrated processing for contrast-enhanced phototrichogram (CE-PTG) analysis. This reference method has been validated with scalp biopsies and histological examination of serial sectioning. RESULTS: Besides edge effects, hair fibres escaped the Trichoscan analysis for various reasons including, but not limited to, thickness, pigmentation, closeness and crossing. CONCLUSION: Most of these problems have been identified in the late 1980s and remain largely unsolved by the processing software that was evaluated in 2004. Therefore claims promoting the Trichoscan method for accurate hair measurements in clinical trials on scalp and body hair are not supported by the present investigation. The speed at which the analysis is performed is outweighed by the errors in signal detection. Therefore we suggest that improvements must be clearly documented before Trichoscan is established for quantified diagnostic purposes and detailed hair cycle monitoring during hair trials. 相似文献
7.
8.
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
9.
C Peabody J Van Norman L Hollister D Warner 《Progress in neuro-psychopharmacology & biological psychiatry》1991,15(1):63-70
1. Twenty-two patients hospitalized for treatment of depression were treated under conditions simulating those of home treatment. 2. Full doses of nortriptyline, from 100 to 150 mg/day, were started after baseline observations were made. 3. Two patients were dropped from the study, one for orthostatic hypotension, one for an aberrant response to nortriptyline. Two additional patients developed orthostasis which was easily managed. Otherwise no unusual side effects were noted. 4. After six days of treatment, 9 of 20 patients showed significant improvement with an overall reduction in scores on the Hamilton Depression Scale of 49% for the entire group. 5. Using the weight-adjusted dosage schedule, 18 of the 21 patients attained plasma concentrations of nortriptyline within the presumed therapeutic range; however, no clear relationship could be established between plasma concentrations and clinical response. 6. With proper selection of patients, it should be possible to treat at home some patients who currently are considered to require hospitalization. 相似文献
10.
D D Cochrane K J Poskitt M G Norman 《The Canadian journal of neurological sciences. Le journal canadien des sciences neurologiques》1991,18(2):181-195
Cerebral dysgenesis encompasses varied disorders of brain development. Based on the understanding of these conditions provided by histopathologists, embryologists, radiologists and developmental pediatricians, surgeons are able to appropriately assist in the care of these patients. The surgeon can offer assessment of the ventriculomegaly that commonly accompanies cerebral dysgenesis in addition to providing methods to control hydrocephalus, to reconstruct cranial and facial malformations and to remove dysfunctional tissue. For most patients, surgical intervention is only one of the many factors that determine developmental prognosis. Based on the foundation built by other specialists, this review discusses cerebral dysgenesis from the perspective of historical and current surgical interventions. 相似文献