全文获取类型
收费全文 | 629篇 |
免费 | 43篇 |
国内免费 | 17篇 |
专业分类
耳鼻咽喉 | 6篇 |
儿科学 | 22篇 |
妇产科学 | 8篇 |
基础医学 | 52篇 |
口腔科学 | 44篇 |
临床医学 | 41篇 |
内科学 | 113篇 |
皮肤病学 | 16篇 |
神经病学 | 85篇 |
特种医学 | 95篇 |
外科学 | 91篇 |
综合类 | 29篇 |
预防医学 | 19篇 |
眼科学 | 7篇 |
药学 | 34篇 |
中国医学 | 1篇 |
肿瘤学 | 26篇 |
出版年
2023年 | 5篇 |
2021年 | 3篇 |
2020年 | 4篇 |
2018年 | 11篇 |
2017年 | 8篇 |
2016年 | 13篇 |
2015年 | 10篇 |
2014年 | 9篇 |
2013年 | 18篇 |
2012年 | 14篇 |
2011年 | 16篇 |
2010年 | 18篇 |
2009年 | 29篇 |
2008年 | 13篇 |
2007年 | 32篇 |
2006年 | 7篇 |
2005年 | 8篇 |
2004年 | 14篇 |
2003年 | 6篇 |
2002年 | 16篇 |
2001年 | 8篇 |
2000年 | 12篇 |
1999年 | 10篇 |
1998年 | 23篇 |
1997年 | 37篇 |
1996年 | 34篇 |
1995年 | 18篇 |
1994年 | 18篇 |
1993年 | 21篇 |
1992年 | 8篇 |
1991年 | 10篇 |
1990年 | 8篇 |
1989年 | 23篇 |
1988年 | 25篇 |
1987年 | 21篇 |
1986年 | 28篇 |
1985年 | 23篇 |
1984年 | 16篇 |
1983年 | 17篇 |
1982年 | 8篇 |
1981年 | 11篇 |
1980年 | 11篇 |
1979年 | 3篇 |
1978年 | 6篇 |
1977年 | 4篇 |
1976年 | 6篇 |
1975年 | 5篇 |
1972年 | 3篇 |
1971年 | 3篇 |
1969年 | 2篇 |
排序方式: 共有689条查询结果,搜索用时 8 毫秒
1.
2.
Planning the aesthetic foreheadplasty 总被引:1,自引:0,他引:1
Different approaches to aesthetic foreheadplasty have been thoroughly described and well documented. However, there has been a paucity of information in the literature describing indications for the various approaches. We detail our approach to planning the foreheadplasty; most commonly, we opt for the anterior forehead-hairline approach. We believe that proper patient selection with regard to anatomical, aesthetic, and physiological factors is of the greatest importance in planning an aesthetic foreheadplasty. 相似文献
3.
The role of growth factors and cytokines in the impaired healing of chronic leg ulcers remains uncertain. The aim of this study was to determine whether changes in the amount and location of cytokines and growth factors may be associated with impaired healing in chronic leg ulcers. Biopsies from leg ulcers of 21 patients and from normal skin of nine healthy volunteers were examined immunohistochemically for selected growth factors and cytokines. Greater staining intensity was found in keratinocytes at the edges of ulcers compared to normal skin, or skin adjacent to the ulcers. Staining at the ulcer edge was more intense in nonhealing ulcers for only vascular endothelial growth factor and platelet-derived growth factor, whereas staining in the adjacent skin was more intense for all factors in the nonhealing phase. For all factors staining was cytoplasmic, suggesting production in these areas. This study shows up-regulation of the production of cytokines and growth factors in keratinocytes of chronic leg ulcers that is greater when the ulcers are nonhealing. 相似文献
4.
5.
Cortical potentials related to voluntary and passive finger movements recorded from subdural electrodes in humans 总被引:2,自引:0,他引:2
Movement-related potentials were recorded from subdural electrodes placed on the precentral and postcentral cortex in 3 patients undergoing operation for intractable epilepsy. With self-initiated index finger movement, a negative potential of 25 to 50 microvolts in amplitude, preceding onset of the electromyographic activity by 60 to 95 ms (or onset of movement by 150 to 230 ms), was recorded from the hand somatosensory postrolandic area in all 3 patients. A similar potential preceding the movement was recorded from the precentral hand motor area in one subject who was the only patient in whom the precentral electrodes were placed on the hand motor area. Following active and passive movements, a clearly defined positivity (18 to 32 ms after a photometer trigger) that reversed phase across the central fissure was recorded. The premovement potentials are most probably generated by pyramidal tract neurons and motor-function-related neurons located in the post- and prerolandic areas. The postmovement positivity is most probably due to short-latency kinesthetic reafferent activation of the posterior bank of the central fissure (equivalent to P2 of the somatosensory evoked potentials). 相似文献
6.
7.
Picotamide inhibition of excess in vitro thromboxane B2 release by colorectal mucosa in inflammatory bowel disease. 总被引:1,自引:0,他引:1
Collins CE Benson MJ Burnham WR Rampton DS 《Alimentary pharmacology & therapeutics》1996,10(3):315-320
BACKGROUND: Inflammatory bowel disease is associated with increased mucosal release of eicosanoids. Among these, thromboxane A2 has been proposed as a possible inflammatory mediator; its suppression may be a useful therapeutic option. METHODS: Using a tissue incubation technique, we compared release of immunoreactive thromboxane B2 by colonic biopsies from patients with ulcerative colitis, Crohn's disease and controls, and assessed the inhibitory effect of picotamide, a thromboxane synthesis inhibitor-receptor antagonist, which has been widely used in Italy for management of ischaemic heart and cerebrovascular disease. RESULTS: Increased amounts of thromboxane B2 were released from biopsies from patients with active ulcerative colitis (median 238 pg/20 min/mg wet weight (interquartile range 147- 325), n = 12) and active Crohn's disease (252 (174-450), 6) compared with those from patients with quiescent ulcerative colitis (95 (61- 140), 12) or Crohn's disease (105 (57-201), 13), or controls (136 (64- 206), 8). Incubation with picotamide at concentrations between 100 microM and 1 mM reduced thromboxane B2 release (IC50 890 microM). CONCLUSION: Since increased thromboxane A2 production may have pathogenetic importance, thromboxane synthesis inhibitor-receptor antagonists such as picotamide merit therapeutic trial in the management of inflammatory bowel disease. 相似文献
8.
Anderson RA; Evans LW; Irvine DS; McIntyre MA; Groome NP; Riley SC 《Human reproduction (Oxford, England)》1998,13(12):3319-3325
Follistatin is a binding protein for the activin and inhibin family of
hormones, regulating their biological activity. In the male reproductive
tract, the interaction of these factors is likely to be involved in the
regulation of the proliferation of several cell types. We have investigated
the presence of follistatin and activin A in seminal plasma using specific
immunoassays and have localized follistatin and activin/inhibin subunits in
the adult human testis, prostate and seminal vesicle to establish their
likely sources. High concentrations of immunoreactive follistatin were
present in seminal plasma in normal men (mean 97.9 ng/ml; 1.43 ng/ml in
peripheral plasma) and were similar in men with oligo/azoospermia and
following vasectomy. Follistatin immunoreactivity was localized to both
Leydig and Sertoli cells of the testis, and to epithelial cells of the
prostate gland and seminal vesicle, which are likely to be the predominant
sources of the hormone in seminal plasma. Activin A was also present in
seminal plasma in normal men but was undetectable following vasectomy, thus
deriving from the testis. Consistent with this finding, the betaA-subunit
was immunolocalized in Sertoli and Leydig cells but was not present in
seminal vesicle or prostate gland. The functional significance of the high
concentrations of follistatin secreted into seminal plasma by the prostate
gland and/or seminal vesicle is uncertain, but they may regulate the
biological activity of testis-derived activin A and inhibin B.
相似文献
9.
10.