全文获取类型
收费全文 | 2349930篇 |
免费 | 171615篇 |
国内免费 | 3340篇 |
专业分类
耳鼻咽喉 | 32049篇 |
儿科学 | 75897篇 |
妇产科学 | 62685篇 |
基础医学 | 348172篇 |
口腔科学 | 63633篇 |
临床医学 | 211352篇 |
内科学 | 457388篇 |
皮肤病学 | 51728篇 |
神经病学 | 185269篇 |
特种医学 | 88008篇 |
外国民族医学 | 489篇 |
外科学 | 353882篇 |
综合类 | 47509篇 |
现状与发展 | 12篇 |
一般理论 | 848篇 |
预防医学 | 182729篇 |
眼科学 | 54325篇 |
药学 | 175102篇 |
11篇 | |
中国医学 | 4575篇 |
肿瘤学 | 129222篇 |
出版年
2021年 | 18989篇 |
2019年 | 19546篇 |
2018年 | 27066篇 |
2017年 | 20359篇 |
2016年 | 22747篇 |
2015年 | 25646篇 |
2014年 | 36104篇 |
2013年 | 53955篇 |
2012年 | 74689篇 |
2011年 | 79412篇 |
2010年 | 47066篇 |
2009年 | 44571篇 |
2008年 | 74614篇 |
2007年 | 79484篇 |
2006年 | 80295篇 |
2005年 | 77786篇 |
2004年 | 74369篇 |
2003年 | 71693篇 |
2002年 | 69367篇 |
2001年 | 108744篇 |
2000年 | 111453篇 |
1999年 | 93498篇 |
1998年 | 26990篇 |
1997年 | 23658篇 |
1996年 | 24054篇 |
1995年 | 22715篇 |
1994年 | 20893篇 |
1993年 | 19712篇 |
1992年 | 72000篇 |
1991年 | 70069篇 |
1990年 | 68391篇 |
1989年 | 65663篇 |
1988年 | 60302篇 |
1987年 | 59125篇 |
1986年 | 55218篇 |
1985年 | 53008篇 |
1984年 | 39312篇 |
1983年 | 33400篇 |
1982年 | 19858篇 |
1979年 | 35871篇 |
1978年 | 25653篇 |
1977年 | 21230篇 |
1976年 | 20332篇 |
1975年 | 21819篇 |
1974年 | 26149篇 |
1973年 | 24802篇 |
1972年 | 23201篇 |
1971年 | 22037篇 |
1970年 | 20248篇 |
1969年 | 19315篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
971.
972.
Slowly progressive aphasia without generalized dementia: studies with positron emission tomography 总被引:14,自引:0,他引:14
J B Chawluk M M Mesulam H Hurtig M Kushner S Weintraub A Saykin N Rubin A Alavi M Reivich 《Annals of neurology》1986,19(1):68-74
Slowly progressive aphasia without generalized dementia is a degenerative syndrome selectively affecting dominant hemisphere language areas. We report changes in regional glucose metabolism measured by positron emission tomography in two patients with this condition. Striking abnormalities of glucose utilization in the left cerebral cortex were demonstrated in both patients. The findings of other neurodiagnostic studies were relatively unremarkable. The first patient had a 3-year history of progressive anomia and impaired auditory verbal recall. An electroencephalogram was normal, and computed tomography showed mild left perisylvian atrophy. Positron emission tomography revealed profound hypometabolism in the left temporal regions. The second patient also had a 3-year history of progressive anomia. Electroencephalography, computed tomography, and magnetic resonance imaging scans were normal. Positron emission tomography showed a major reduction in left parietal glucose utilization, with a lesser decrement in left temporal metabolism. Neither patient demonstrated significant contralateral or global abnormalities such as those reported in positron emission tomographic studies of Alzheimer's disease with or without focal clinical features. These observations support the concept of adult-onset progressive aphasia without dementia as a clinical syndrome distinct from Alzheimer's disease. 相似文献
973.
Neuropsychological and psychological sequelae of shunt surgery in young adults with hydrocephalus 总被引:1,自引:0,他引:1
J A Ogden 《Journal of clinical and experimental neuropsychology》1986,8(6):657-679
Three patients with hydrocephalus aged 16, 26, and 33 years demonstrated memory deficits before or after the insertion of a ventricular shunt but at no time demonstrated ataxia, incontinence, or dementia. Following shunt surgery, memory functions improved rapidly in the patient who had had a recent acute onset of hydrocephalus, but in the two patients with a long period of hydrocephalus before shunting, memory impairments did not recover significantly in one patient, and in the other, memory impairments had become more severe by 12 months postshunt. Other neuropsychological and psychological sequelae of adult hydrocephalus are discussed, and it is suggested that for patients with chronic hydrocephalus, an extended period of neurological and neuropsychological monitoring may be advantageous before a decision is made to perform shunt surgery. 相似文献
974.
975.
976.
A W Biglan R Gonnering L B Lockhart B Rabin F H Fuerste 《American journal of ophthalmology》1986,101(2):232-235
To test the possibility of the formation of an antibody to botulinum A toxin after multiple injections of this potent neurotoxin, we collected serum samples from 28 patients who received 57 doses. These injections over a nine-month period with as much as 50 units per injection formed no detectable antibody. 相似文献
977.
AIDS: what is now known. I. History and immunovirology 总被引:1,自引:0,他引:1
P A Selwyn 《Hospital practice (Office ed.)》1986,21(5):67-76, 81-2
978.
979.
980.
Marcel J. Kooy Wouter S. Dessing Esther F. Kroodsma Steven R. J. G. Smits Esther H. Fietje Martine Kruijtbosch Peter A. G. M. De Smet 《Pharmacy World & Science》2007,29(2):81-89
OBJECTIVE: According to a report published by the federation of Dutch patients' associations, patients would like to see a pharmacist, who acts more as a personal adviser. This raised the question, how often Dutch community pharmacists have personal consultations with their patients in daily practice, on which factors this depends, and what kind of topics are discussed during these meetings. SETTING: Community pharmacies in the Netherlands. METHOD: A questionnaire was distributed among 800 randomly selected pharmacies. Questions were restricted to consultations characterized by one-to-one contact, drug therapy related content, and adequate privacy. These consultations were labelled as pharmaceutical consultations in private to distinguish them from other contacts between pharmacists and patients. MAIN OUTCOME MEASURE: Number, content, and character of consultations. RESULTS: 198 (24.8%) community pharmacies responded. The pharmacists provide an average of roughly 1.2 consultations in private per working day. The vast majority of respondents provided face-to-face and telephone consultations (94.4 and 91.9%, respectively), only a minority gave consultations by e-mail (30.8%). These consultations primarily dealt with topics related to medication safety. The mean overall time spent was 290 min per month. A relatively high frequency of personal consultations was significantly associated with the absolute number of full-time equivalent pharmacists in the pharmacy. CONCLUSION: The frequency of pharmaceutical consultations in private is low, but may be improved by reorganisation of the pharmacist's activities. The possibility of personal consultations by e-mail is not yet well-developed. Further research is needed to assess the patient's view of pharmaceutical consultations in private. 相似文献