全文获取类型
收费全文 | 2314篇 |
免费 | 167篇 |
国内免费 | 9篇 |
专业分类
耳鼻咽喉 | 18篇 |
儿科学 | 151篇 |
妇产科学 | 72篇 |
基础医学 | 268篇 |
口腔科学 | 32篇 |
临床医学 | 224篇 |
内科学 | 423篇 |
皮肤病学 | 28篇 |
神经病学 | 109篇 |
特种医学 | 312篇 |
外科学 | 176篇 |
综合类 | 83篇 |
一般理论 | 1篇 |
预防医学 | 226篇 |
眼科学 | 31篇 |
药学 | 131篇 |
中国医学 | 9篇 |
肿瘤学 | 196篇 |
出版年
2021年 | 12篇 |
2020年 | 12篇 |
2019年 | 20篇 |
2018年 | 27篇 |
2017年 | 19篇 |
2016年 | 22篇 |
2015年 | 34篇 |
2014年 | 60篇 |
2013年 | 100篇 |
2012年 | 84篇 |
2011年 | 103篇 |
2010年 | 70篇 |
2009年 | 105篇 |
2008年 | 79篇 |
2007年 | 108篇 |
2006年 | 80篇 |
2005年 | 77篇 |
2004年 | 70篇 |
2003年 | 59篇 |
2002年 | 66篇 |
2001年 | 60篇 |
2000年 | 63篇 |
1999年 | 49篇 |
1998年 | 85篇 |
1997年 | 67篇 |
1996年 | 81篇 |
1995年 | 60篇 |
1994年 | 57篇 |
1993年 | 56篇 |
1992年 | 40篇 |
1991年 | 36篇 |
1990年 | 39篇 |
1989年 | 67篇 |
1988年 | 48篇 |
1987年 | 50篇 |
1986年 | 42篇 |
1985年 | 32篇 |
1984年 | 27篇 |
1983年 | 28篇 |
1982年 | 23篇 |
1981年 | 27篇 |
1980年 | 19篇 |
1979年 | 23篇 |
1978年 | 17篇 |
1977年 | 25篇 |
1976年 | 17篇 |
1975年 | 17篇 |
1974年 | 12篇 |
1970年 | 13篇 |
1968年 | 13篇 |
排序方式: 共有2490条查询结果,搜索用时 0 毫秒
1.
J Sargent 《Pediatric annals》1992,21(11):720-2, 725-7
2.
3.
Variables that affect the expansion rate and outcome of small abdominal aortic aneurysms 总被引:2,自引:0,他引:2
J L Cronenwett S K Sargent M H Wall M L Hawkes D H Freeman B J Dain J K Curé D B Walsh R M Zwolak M D McDaniel 《Journal of vascular surgery》1990,11(2):260-8; discussion 268-9
Seventy-three patients with small (less than 6 cm in diameter) abdominal aortic aneurysms (AAAs) were selected for nonoperative management and followed up with sequential ultrasound size measurements. Fifty-four men and 19 women, 51 to 89 years of age (mean 70 years), had an initial mean AAA size of 4.1 cm (anteroposterior) x 4.3 cm (lateral) diameter, with a calculated elliptic cross-sectional area of 14.3 cm2. After a mean of 37 months of follow-up, AAA area increased at a mean rate of 20% per year (3 cm2 yr; 0.4 to 0.5 cm/yr diameter). Expansion rate was not affected by initial aneurysm size. During follow-up, only 3 patients (4%) required urgent operation (1 died), 26 patients (36%) died of non-AAA causes, and 26 patients (36%) underwent elective AAA repair because of progressive size increase (1 died). Elective operations were performed at the rate of 10% per year, when mean AAA size had increased to 22 cm2 (5.1 cm in diameter). Multiple regression analysis of clinical parameters available at presentation indicated that subsequent elective AAA repair was predicted by younger age at diagnosis and larger initial aneurysm size. As anticipated, patients who underwent surgery had more rapid aneurysm expansion (5.3 cm2/yr) compared with patients who did not undergo surgery (1.6 cm2/yr; p less than 0.05). This difference was caused by more rapid expansion during later follow-up intervals among patients selected for operation and was not predicted by the change in aneurysm size observed during initial ultrasonographic follow-up. Final aneurysm size was predicted by initial size, duration of follow-up, and both systolic and diastolic pressure.(ABSTRACT TRUNCATED AT 250 WORDS) 相似文献
4.
郭永建 《福建医科大学学报》1994,(1)
采用间接ELISA检测23名肾移植受者血清巨细胞病毒(CMV)抗体,共检出18名(78%)活动性CMV感染,其中10名(44%)为原发性感染。结果证实CMV-IgE和-IgA具有较好的血清学诊断价值,优于CMV-IgM。 相似文献
5.
6.
CA Schroeter† L Kaas† JJ Waterval† PM Bos‡ HAM Neumann§ 《Journal of the European Academy of Dermatology and Venereology》2007,21(9):1170-1174
AIM: The aim of this pilot study was an investigation on photodynamic therapy (PDT) whether it is a good alternative for treating periungual and subungual warts of the hands. STUDY DESIGN: Twenty patients (mean age: 30.5 years) with a total of 40 periungual and subungual warts were treated with PDT. A photosensitizer, 20%delta-aminolevulinic acid was applied on the warts. After a mean incubation time of 4.6 h (SD: 1.2), the warts were irradiated with the VersaLight for 5-30 min (15.2 +/- 4.3 min). RESULTS: After a mean of 4.5 treatments a mean clearance of 100% was achieved in 90% of the patients. One patient (5%) showed a clearance of 50% and another showed no improvement. The subungual or periungual location of the wart had no influence on the number of treatments or end result (P > 0.05). There were two recurrences during the mean follow-up period of 5.9 months (SD: 7.6). Besides mainly pain and hyperpigmentation, most treatments had no side-effects. CONCLUSION: PDT can offer a good alternative for treating periungual warts of the hands. Larger studies are indicated. 相似文献
7.
Mosaic ring 12p and total anomalous pulmonary venous return 总被引:1,自引:0,他引:1
Harris DL Siu BL Hummel M Harbert K Senft J Sargent L Wenger SL 《American journal of medical genetics. Part A》2004,131(1):91-93
An infant born with total anomalous pulmonary venous return (TAPVR) was found to have an extra chromosome present as a small ring. Spectral karyotyping and FISH analysis identified the material as a duplication involving the short arm of chromosome 12. Previous cases describing a variety of cytogenetic abnormalities that have been associated with TAPVR are reviewed along with prior cases of duplication 12p with their associated findings. We believe ours is the first case to report the occurrence of mosaic ring 12p and its association with TAPVR. 相似文献
8.
9.
1. A systematic study has been made of the sensitivity of identified sensory and motoneurons in the leech central nervous system to chemical transmitter substances. 2. The following substances elicited responses from the cell bodies of individual neurons: acetylcholine, 5-hydroxytryptamine, gamma-aminobutyric acid, glutamic acid, glycine, dopamine, and norepinephrine. Since the cell bodies of leech neurons are free of synapses, the receptors that give rise to these responses are extrasynaptic. 3. Sensory and motoneurons of different function had characteristic complements of extrasynaptic receptors. For example, mechanosensory cells responding to light touch, to pressure, and to noxious stimuli could be distinguished by their responses to iontophoretically applied compounds. For one of these modalities (nociceptive), neurons with different receptive fields but otherwise similar properties had markedly distinct extrasynaptic receptors. The possible significance of extrasynaptic receptors is discussed. 相似文献
10.