全文获取类型
收费全文 | 14545篇 |
免费 | 1196篇 |
国内免费 | 94篇 |
专业分类
耳鼻咽喉 | 97篇 |
儿科学 | 481篇 |
妇产科学 | 416篇 |
基础医学 | 1849篇 |
口腔科学 | 343篇 |
临床医学 | 1533篇 |
内科学 | 2953篇 |
皮肤病学 | 161篇 |
神经病学 | 1474篇 |
特种医学 | 761篇 |
外科学 | 1950篇 |
综合类 | 331篇 |
一般理论 | 26篇 |
预防医学 | 1410篇 |
眼科学 | 268篇 |
药学 | 896篇 |
中国医学 | 41篇 |
肿瘤学 | 845篇 |
出版年
2021年 | 141篇 |
2020年 | 98篇 |
2019年 | 153篇 |
2018年 | 162篇 |
2017年 | 122篇 |
2016年 | 141篇 |
2015年 | 199篇 |
2014年 | 242篇 |
2013年 | 479篇 |
2012年 | 591篇 |
2011年 | 689篇 |
2010年 | 400篇 |
2009年 | 409篇 |
2008年 | 666篇 |
2007年 | 765篇 |
2006年 | 766篇 |
2005年 | 755篇 |
2004年 | 744篇 |
2003年 | 733篇 |
2002年 | 745篇 |
2001年 | 233篇 |
2000年 | 253篇 |
1999年 | 300篇 |
1998年 | 277篇 |
1997年 | 256篇 |
1996年 | 261篇 |
1995年 | 227篇 |
1994年 | 183篇 |
1993年 | 196篇 |
1992年 | 260篇 |
1991年 | 219篇 |
1990年 | 194篇 |
1989年 | 223篇 |
1988年 | 245篇 |
1987年 | 218篇 |
1986年 | 218篇 |
1985年 | 220篇 |
1984年 | 202篇 |
1983年 | 153篇 |
1982年 | 182篇 |
1981年 | 166篇 |
1980年 | 150篇 |
1979年 | 151篇 |
1978年 | 154篇 |
1977年 | 127篇 |
1976年 | 98篇 |
1975年 | 117篇 |
1974年 | 113篇 |
1973年 | 102篇 |
1972年 | 80篇 |
排序方式: 共有10000条查询结果,搜索用时 15 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.
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.
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
9.
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
10.
A flow-through finite-dose diffusion cell has been designed for use in transdermal drug delivery research. The diffusion cell consists of an upper donor chamber and a lower receiver compartment through which a continuous supply of fresh solvent flows. The flow is directed to an automatic fraction collector. To validate the flow-through cell, its performance was compared directly against that of a conventional single-reservoir Franz cell. Homologous alkyl p-aminobenzoates were diffused through dimethylpolysiloxane membranes, and permeability coefficients increased with increasing chain length, reaching a plateau at the butyrate ester for both types of cells. This behavior suggests a shift from membrane-controlled diffusion to boundary layer control. Permeation of the butyrate and valerate compounds was significantly faster when the flow-through cell was used, suggesting that better mixing is obtained through the flow-through cell design. Considering the advantages offered in terms of time and labor saved through its use, the flow-through cell with automatic fraction collector appears to be a viable alternative to the conventional Franz cell. 相似文献