全文获取类型
收费全文 | 3385511篇 |
免费 | 251727篇 |
国内免费 | 5016篇 |
专业分类
耳鼻咽喉 | 47167篇 |
儿科学 | 111098篇 |
妇产科学 | 93834篇 |
基础医学 | 491713篇 |
口腔科学 | 96801篇 |
临床医学 | 305958篇 |
内科学 | 649201篇 |
皮肤病学 | 74112篇 |
神经病学 | 270127篇 |
特种医学 | 129201篇 |
外国民族医学 | 902篇 |
外科学 | 508922篇 |
综合类 | 76490篇 |
现状与发展 | 13篇 |
一般理论 | 1299篇 |
预防医学 | 267275篇 |
眼科学 | 79316篇 |
药学 | 253624篇 |
13篇 | |
中国医学 | 6359篇 |
肿瘤学 | 178829篇 |
出版年
2018年 | 35772篇 |
2017年 | 27245篇 |
2016年 | 30533篇 |
2015年 | 34721篇 |
2014年 | 48783篇 |
2013年 | 73904篇 |
2012年 | 101075篇 |
2011年 | 107341篇 |
2010年 | 63771篇 |
2009年 | 60481篇 |
2008年 | 101336篇 |
2007年 | 107746篇 |
2006年 | 108946篇 |
2005年 | 106001篇 |
2004年 | 102524篇 |
2003年 | 98202篇 |
2002年 | 95838篇 |
2001年 | 151203篇 |
2000年 | 155954篇 |
1999年 | 131878篇 |
1998年 | 38345篇 |
1997年 | 33979篇 |
1996年 | 33966篇 |
1995年 | 32494篇 |
1994年 | 30203篇 |
1993年 | 28512篇 |
1992年 | 105524篇 |
1991年 | 103172篇 |
1990年 | 100779篇 |
1989年 | 97393篇 |
1988年 | 90171篇 |
1987年 | 88527篇 |
1986年 | 83708篇 |
1985年 | 80628篇 |
1984年 | 60450篇 |
1983年 | 51847篇 |
1982年 | 30773篇 |
1981年 | 27747篇 |
1979年 | 56805篇 |
1978年 | 40222篇 |
1977年 | 33744篇 |
1976年 | 32147篇 |
1975年 | 34381篇 |
1974年 | 41601篇 |
1973年 | 39786篇 |
1972年 | 37135篇 |
1971年 | 35072篇 |
1970年 | 32345篇 |
1969年 | 30732篇 |
1968年 | 28097篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
941.
942.
943.
944.
945.
The response of single detergent treated bovine retinal pigment epithelial cells in culture to ATP was measured with an image analyser. The most pronounced contraction was produced by 1.0 mM ATP with most change taking place in the first 10 min. At 1 h the area had decreased by about 33%, perimeter 22% and maximum length 25%. By way of comparison rabbit skin fibroblasts had a decreased area of approximately 40%, perimeter 25% and maximum length 22%. Bovine aortic smooth muscle cells on the other hand decreased in area by 55%, perimeter 40% and maximum length 36%. It is hoped that this assay may be used to evaluate drugs which could counteract contractile events in proliferative vitreoretinopathy. 相似文献
946.
G F Watts L Gregory R Naoumova C Kubal K M Shaw 《European journal of clinical nutrition》1988,42(8):697-702
The onset of diabetic nephropathy is characterized by subclinical elevation of urinary albumin excretion, so-called 'microalbuminuria' (M). Dietary assessments were carried out in 15 insulin-dependent diabetic patients with persistent M and an equal number with persistently normal albumin excretion. The groups were matched for sex, age, duration of diabetes, body mass index, insulin dose and glycosylated haemoglobin; there were no significant differences in systemic blood pressure, glomerular filtration rate, blood glucose and serum albumin concentrations between the groups; retinopathy was significantly more frequent in patients with M. Diabetics with persistent M were found to consume a significantly larger amount of fat (expressed as grams and percentage of total energy) and a significantly smaller percentage of total energy as carbohydrate than patients with normal albumin excretion; total dietary energy was larger in those with persistent M, but the difference was not significant. No significant differences were found in protein and fibre intakes between the groups. Our findings suggest that an excess in the dietary consumption of fat relative to carbohydrate might play an important role in the pathogenesis of early nephropathy in insulin-dependent diabetes mellitus. We emphasize the importance of careful attention to nutrient intake in the prevention and treatment of diabetic complications. 相似文献
947.
Post-traumatic retinal detachment occurs frequently as a late consequence of progressive vitreous changes, especially following penetrating injuries. Occasionally, it develops soon after the trauma, without preceding proliferative vitreoretinopathy, is based on posterior vitreous detachment and morphologically resembles an idiopathic retinal detachment. It is possible that the posterior vitreous detachment in these cases is encouraged by the presence of intravitreal hemorrhage. 相似文献
948.
949.
950.