全文获取类型
收费全文 | 344篇 |
免费 | 20篇 |
国内免费 | 66篇 |
专业分类
耳鼻咽喉 | 2篇 |
儿科学 | 41篇 |
妇产科学 | 1篇 |
基础医学 | 34篇 |
口腔科学 | 25篇 |
临床医学 | 61篇 |
内科学 | 77篇 |
皮肤病学 | 1篇 |
神经病学 | 10篇 |
特种医学 | 96篇 |
外科学 | 12篇 |
综合类 | 17篇 |
预防医学 | 6篇 |
药学 | 35篇 |
中国医学 | 2篇 |
肿瘤学 | 10篇 |
出版年
2022年 | 1篇 |
2019年 | 2篇 |
2018年 | 2篇 |
2017年 | 4篇 |
2016年 | 4篇 |
2015年 | 2篇 |
2014年 | 3篇 |
2013年 | 5篇 |
2012年 | 5篇 |
2011年 | 4篇 |
2010年 | 6篇 |
2009年 | 10篇 |
2008年 | 6篇 |
2007年 | 35篇 |
2006年 | 8篇 |
2005年 | 6篇 |
2004年 | 2篇 |
2003年 | 6篇 |
2002年 | 13篇 |
2001年 | 15篇 |
2000年 | 11篇 |
1999年 | 9篇 |
1998年 | 26篇 |
1997年 | 26篇 |
1996年 | 25篇 |
1995年 | 18篇 |
1994年 | 18篇 |
1993年 | 10篇 |
1992年 | 1篇 |
1991年 | 3篇 |
1990年 | 11篇 |
1989年 | 15篇 |
1988年 | 16篇 |
1987年 | 12篇 |
1986年 | 11篇 |
1985年 | 16篇 |
1984年 | 4篇 |
1983年 | 7篇 |
1982年 | 8篇 |
1981年 | 8篇 |
1980年 | 5篇 |
1978年 | 7篇 |
1977年 | 4篇 |
1976年 | 5篇 |
1975年 | 7篇 |
1958年 | 1篇 |
1957年 | 2篇 |
1956年 | 2篇 |
1955年 | 1篇 |
1954年 | 2篇 |
排序方式: 共有430条查询结果,搜索用时 15 毫秒
71.
72.
73.
74.
The CT appearance of the adrenal glands was investigated in 30 patients with congenital renal anomalies (17 cases of unilateral renal agenesis, 11 of inferior ectopy, and 2 of crossed fused ectopy). The ipsilateral adrenal was clearly identified in 83% of these patients; in all of them, the adrenal was a paraspinal disk-shaped organ, which appeared linear on CT. Conversely, the adrenals retained their normal shape in a control group of 20 patients with acquired renal atrophy or prior simple nephrectomy. 相似文献
75.
76.
常咯啉在实验性心律失常狗的药代动力学-药效动力学分析 总被引:1,自引:0,他引:1
用Harris冠脉结扎法诱发的心律失常狗研究常咯啉药代动力学-药效动力学。7只狗按83.33μg·kg ̄(-1)·min ̄(-1)静脉滴注60min,在给药期间和停药后不同时间记录ECG及测定血药浓度。C-T数据用药代程序计算药代参数;药效数据用药代-药效同步分析模型计算药效动力学参数,K10,T1/2,Vd,Cl分别为0.0087min ̄(-1),78.03min,40.55ml·kg ̄(-1)和0.421ml·kg ̄(-1)·min ̄(-1);Ke0和Ce(50)分别为0.0048min ̄(-1)和2.01μg·ml ̄(-1). 相似文献
77.
78.
BMP2,3,4,5 mRNA在三叉神经中的表达分析 总被引:1,自引:0,他引:1
目的:明确 B M Ps 与外周神经的关系。方法:用原位杂交方法观察 B M P2,3,4,5 的m R N A在三叉神经中的表达。结果:在外周神经(三叉神经)中均有 B M P2,3,4,5 m R N A 分布, B M P2,3,4,5 的分布主要位于构成神经纤维髓鞘的雪旺细胞中;此外发现 B M P2 在部分神经纤维中也有表达。结论:首次确定了 B M P2,3,4,5 在外周神经中的表达和分布,揭示了 B M P2,3,4,5可能在外周神经的发育和再生以及形态结构的维持中发挥着调控作用。 相似文献
79.
An immunohistochemical study of keratin expression in ameloblastoma from a Kenyan population 总被引:4,自引:0,他引:4
OBJECTIVES: Ameloblastomas appear to exhibit biological heterogeneity and, except in the case of malignancy, histological appearances that do not always allow their behaviour to be predicted. The aim of this study was to assess keratin expression in African ameloblastomas and to correlate this with their clinical and histological features. MATERIALS AND METHODS: Expression of simple keratins 7, 8, 18 and 19; cornification keratins 1 and 10; basal and differentiation keratins 5 and 14 and hyperproliferation-related keratins 6 and 16 in 14-39 cases of ameloblastoma was assessed by immunohistochemical methods. RESULTS: There was patchy expression of keratin 7 in the suprabasal and stellate reticulum-like cells in some cases. All cases showed similar weak expression for keratins 8 and 18 in suprabasal and stellate reticulum-like cells but none showed keratin 1 or 10 expression. There was intense expression of keratins 5, 14 and 19 by all tumour cells suggesting that they may retain basal cell characteristics with a potential for proliferation. No consistent relationship was seen between histological types and keratin expression pattern. However, keratins 6 and 16, expressed by suprabasal and stellate reticulum-like cells, showed a marked variation within and between cases, with the highest levels of expression in squamous strands. CONCLUSIONS: We propose that squamous strands may represent the sites of most active growth within individual tumours and expression of keratins 6, 16 and 19 may be predictors of rapid growth. There is a need for further investigation of this in longitudinal clinical studies. 相似文献
80.
BACKGROUND: The resistance of thrombi to fibrinolysis induced by plasminogen activators remains a major impediment to the successful treatment of thrombotic diseases. This study examines the contribution of activated factor XIII (factor XIIIa) to fibrinolytic resistance in experimental pulmonary embolism. METHODS AND RESULTS: The fibrinolytic effects of specific inhibitors of factor XIIIa-mediated fibrin-fibrin cross-linking and alpha2-antiplasmin-fibrin cross-linking were measured in anesthetized ferrets with pulmonary emboli. Five experimental groups were treated with heparin (100 U/kg) and/or tissue plasminogen activator (TPA, 1 mg/kg) and the percent (mean+/-SD) lysis of emboli was determined: (1) control, normal factor XIIIa activity (14.1+/-4. 8% lysis); (2) inhibited factor XIIIa activity (42.7+/-7.4%); (3) normal factor XIIIa activity+TPA (32.3+/-7.7%); (4) inhibited factor XIIIa activity+TPA (76.0+/-11.9%); and (5) inhibited alpha2-antiplasmin-fibrin cross-linking+TPA (54.7+/-3.9%). Inhibition of factor XIIIa activity increased endogenous lysis markedly (group 1 versus 2; P<0.0001), to a level comparable to that achieved with TPA (group 2 versus 3; P<0.05). Among groups receiving TPA, selective inhibition of factor XIII-mediated alpha2-antiplasmin-fibrin cross-linking enhanced lysis (group 3 versus 5; P<0.0005). Complete inhibition of factor XIIIa also amplified lysis (group 3 versus 4; P<0.0001) and had greater effects than inhibition of alpha2-antiplasmin cross-linking alone (group 4 versus 5; P<0.0005). No significant fibrinogen degradation occurred in any group. CONCLUSIONS: Factor XIIIa-mediated fibrin-fibrin and alpha2-antiplasmin-fibrin cross-linking both caused experimental pulmonary emboli to resist endogenous and TPA-induced fibrinolysis. This suggests that factor XIIIa may play a critical role in regulating fibrinolysis in human thrombosis. 相似文献