全文获取类型
收费全文 | 9575篇 |
免费 | 909篇 |
国内免费 | 68篇 |
专业分类
耳鼻咽喉 | 125篇 |
儿科学 | 319篇 |
妇产科学 | 155篇 |
基础医学 | 1293篇 |
口腔科学 | 157篇 |
临床医学 | 1149篇 |
内科学 | 1648篇 |
皮肤病学 | 141篇 |
神经病学 | 849篇 |
特种医学 | 483篇 |
外科学 | 1185篇 |
综合类 | 287篇 |
一般理论 | 8篇 |
预防医学 | 1064篇 |
眼科学 | 170篇 |
药学 | 757篇 |
中国医学 | 3篇 |
肿瘤学 | 759篇 |
出版年
2021年 | 110篇 |
2019年 | 109篇 |
2018年 | 134篇 |
2017年 | 102篇 |
2016年 | 97篇 |
2015年 | 130篇 |
2014年 | 161篇 |
2013年 | 285篇 |
2012年 | 381篇 |
2011年 | 386篇 |
2010年 | 253篇 |
2009年 | 245篇 |
2008年 | 321篇 |
2007年 | 428篇 |
2006年 | 374篇 |
2005年 | 365篇 |
2004年 | 337篇 |
2003年 | 299篇 |
2002年 | 319篇 |
2001年 | 261篇 |
2000年 | 298篇 |
1999年 | 230篇 |
1998年 | 167篇 |
1997年 | 149篇 |
1996年 | 182篇 |
1995年 | 132篇 |
1994年 | 122篇 |
1993年 | 111篇 |
1992年 | 233篇 |
1991年 | 241篇 |
1990年 | 248篇 |
1989年 | 257篇 |
1988年 | 260篇 |
1987年 | 242篇 |
1986年 | 231篇 |
1985年 | 184篇 |
1984年 | 143篇 |
1983年 | 124篇 |
1982年 | 97篇 |
1981年 | 99篇 |
1980年 | 88篇 |
1979年 | 127篇 |
1978年 | 112篇 |
1977年 | 96篇 |
1976年 | 97篇 |
1975年 | 101篇 |
1974年 | 125篇 |
1973年 | 108篇 |
1972年 | 84篇 |
1971年 | 78篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
62.
LN Weinberger MJ Zirwas JC English III 《Journal of the European Academy of Dermatology and Venereology》2007,21(2):156-162
Male genital oedema can be defined as swelling or the appearance of swelling of the scrotum and/or the penile shaft and prepuce. Despite the various causes of genital oedema reported in the published work, a concise approach to the evaluation and management has not been sufficiently addressed. 相似文献
63.
64.
65.
66.
P E Bowen S Mobarhan C Henderson M Stacewicz-Sapuntzakis H Friedman R Kaiser 《JPEN. Journal of parenteral and enteral nutrition》1988,12(5):484-489
We have found that 12 patients requiring permanent enteral feeding secondary to cerebrovascular accident with adequate Vitamin A nutritional status had serum concentrations of various carotenoids which were only 8-17% of sex- and age-matched healthy controls. Their serum retinol levels were normal, but only 61% of their controls despite receiving two to three times the recommended daily allowance (RDA) in retinol equivalents. Commercial enteral formulas were found to contain only negligible quantities of the carotenoids and were the cause of the hypocarotenemia. To assess the ability of these patients to absorb beta-carotene, nine tube-fed patients were given 15 mg of beta-carotene (2.5 times the RDA) in a single dose. Serum concentration time curves showed that only four patients absorbed significant quantities of the beta-carotene and absorption was delayed compared to previously studied subjects taking enteral formulas as meals. These studies suggest that the efficiency of absorption of the fat soluble vitamins may be lower in tube-fed patients and that patients receiving long-term tube feeding are denied the possible protective effects of the carotenoids normally contained in the American diet. 相似文献
67.
68.
69.
70.
Uroscopy in the 21st century: high-field NMR spectroscopy 总被引:1,自引:1,他引:0
Neild GH; Foxall PJ; Lindon JC; Holmes EC; Nicholson JK 《Nephrology, dialysis, transplantation》1997,12(3):404-417
From the experiments described, it can be seen that there are different
research approaches that can be taken and these are summarized in Table 1.
Whereas much scientific research is principally hypothesis led, there
remains, nevertheless, an important place for exploratory research. High
resolution NMR can measure, directly and simultaneously, a wide range of
endogenous metabolites in biological fluids and has the unique capability
of providing structural information on the metabolites detected. It has
proved to be a powerful research tool with which to study inherited
metabolic diseases, renal disease, drug metabolism, and toxicity, and can
be used to monitor the effects of drug therapy. For instance, by using a
library of experimental toxins one can map the metabolic profile of
site-specific nephron injury. With this approach in man one could
eventually take an unknown disease such as Balkan nephropathy and predict
the initial site of tubular injury, the mode of injury and therefore the
kind of toxin capable of producing that injury. NMR spectroscopic
techniques are still advancing rapidly, with ever increasing sensitivity
and sophistication of NMR pulse sequences to enhance structural elucidation
in complex mixtures. Given the advances in directly coupled HPLC-NMR and
even HPLC-NMR-mass spectroscopy it is likely that these technologies in
conjunction with pattern recognition will make major contribution to our
understanding of renal processes and provide new diagnostic insights in the
21st century.
相似文献