全文获取类型
收费全文 | 1501455篇 |
免费 | 108596篇 |
国内免费 | 3013篇 |
专业分类
耳鼻咽喉 | 20705篇 |
儿科学 | 48200篇 |
妇产科学 | 41826篇 |
基础医学 | 216397篇 |
口腔科学 | 39616篇 |
临床医学 | 131038篇 |
内科学 | 298337篇 |
皮肤病学 | 29614篇 |
神经病学 | 121170篇 |
特种医学 | 57591篇 |
外国民族医学 | 377篇 |
外科学 | 231158篇 |
综合类 | 29634篇 |
现状与发展 | 1篇 |
一般理论 | 613篇 |
预防医学 | 112346篇 |
眼科学 | 34945篇 |
药学 | 113084篇 |
7篇 | |
中国医学 | 2771篇 |
肿瘤学 | 83634篇 |
出版年
2021年 | 12255篇 |
2019年 | 12768篇 |
2018年 | 17140篇 |
2017年 | 12953篇 |
2016年 | 14466篇 |
2015年 | 16797篇 |
2014年 | 23608篇 |
2013年 | 34988篇 |
2012年 | 49535篇 |
2011年 | 52674篇 |
2010年 | 30663篇 |
2009年 | 28429篇 |
2008年 | 49665篇 |
2007年 | 53419篇 |
2006年 | 53917篇 |
2005年 | 53096篇 |
2004年 | 50811篇 |
2003年 | 48691篇 |
2002年 | 47377篇 |
2001年 | 60039篇 |
2000年 | 61076篇 |
1999年 | 52760篇 |
1998年 | 16992篇 |
1997年 | 15068篇 |
1996年 | 15027篇 |
1995年 | 14216篇 |
1994年 | 13353篇 |
1993年 | 12250篇 |
1992年 | 42143篇 |
1991年 | 41406篇 |
1990年 | 40799篇 |
1989年 | 39599篇 |
1988年 | 36994篇 |
1987年 | 36196篇 |
1986年 | 34577篇 |
1985年 | 32993篇 |
1984年 | 25039篇 |
1983年 | 21842篇 |
1982年 | 13609篇 |
1979年 | 23269篇 |
1978年 | 16568篇 |
1977年 | 14310篇 |
1976年 | 13512篇 |
1975年 | 14629篇 |
1974年 | 17107篇 |
1973年 | 16432篇 |
1972年 | 15626篇 |
1971年 | 14483篇 |
1970年 | 13435篇 |
1969年 | 12894篇 |
排序方式: 共有10000条查询结果,搜索用时 20 毫秒
31.
There is some evidence suggesting that Parkinson's disease (PD) patients exhibit lower body weight when compared to age-matched healthy subjects. Low body mass index (BMI) is correlated with low bone mineral density, both of which are major risk factors for hip fractures. Possible determinants of weight loss in PD patients include hyposmia, impaired hand-mouth coordination, difficulty chewing, dysphagia, intestinal hypomotility, depression, decreased reward processing of dopaminergic mesolimbic regions, nausea, and anorexia as the side effects of medication, and increased energy requirements due to muscular rigidity and involuntary movements. It is unclear whether PD patients in general, or only a subgroup of those affected, definitely show lower BMI in the advanced stages of the disease. We therefore recommend that the body weight of PD patients be monitored monthly as the disease progresses, and that a patient's nutrition should be supplemented with sufficient amounts of vitamin D and calcium to reduce the risk of hip fractures and strengthen bone density. Because meal times may coincide with unpredictable off periods associated with akinesia and impaired hand-mouth coordination, PD patients also need flexible food schedules that accommodate the associated symptoms of this disease. 相似文献
32.
Thierry Patrice David Olivier Ludovic Bourre 《Journal of environmental pathology, toxicology and oncology》2006,25(1-2):467-485
Photodynamic therapy (PDT) is based on the selective light activation of an exogenously given drug to patients. PDT acts mainly on cell membranes either of neovascular endothelial cells or of cancer cells leading to cancer cell death. Six drugs are now marketed based on clinical assays in various indications, which showed a clear cost efficiency as compared to other classical procedures. PDT is easy to handle and can be performed in medical installations fitting the conditions of health care in developing countries. Its cost effectiveness could represent an appropriate solution to the increasing number of cancers of various origin. However despite all the clinical results now available, PDT development remains slow. The reasons for this situation include cost of development, intellectual property, and competition between pharmaceutical companies. 相似文献
33.
34.
35.
36.
K M Sarraf M Abdalla O Al-Omari M G Sarraf 《Ultrasound in obstetrics & gynecology》2006,27(2):220-221
We report the case of a 38-year-old woman who presented with chronic lower abdominal pain. Her past medical history included a splenectomy due to abdominal trauma. Ultrasound examination revealed four pelvic tumors which, upon laparotomy, were found to be the result of splenosis. Approximately 100 cases of splenosis have been reported but only a minority of them have been published in the gynecological literature. Our case indicates that those involved in pelvic scanning (even of asymptomatic women) and/or treating those complaining of lower abdominal pain or presenting with pelvic tumors should be aware of splenosis as a possible diagnosis. 相似文献
37.
38.
39.
40.
M Ugras† G Kocak† H Ozcan‡ 《Journal of the European Academy of Dermatology and Venereology》2006,20(9):1126-1128
Neu-Laxova syndrome (NLS) is a rare autosomal recessive syndrome, characterized by severe intrauterine growth retardation (IUGR), microcephaly, abnormal brain development, oedema and ichthyosis. It was first reported in 1971 by Neu et al. (Pediatrics 47: 610-612) and since then no more than 60 cases have been reported. A newborn girl delivered from a 29-year-old healthy mother was admitted to hospital with a thick membrane covering her body and dismorphic appearance. The diagnosis of NLS was made according to characteristic features. The syndrome is known to have a poor prognosis and the baby lived for 9 weeks. This case is one of the longest living cases of NLS and the fourth case reported from Turkey. 相似文献