全文获取类型
收费全文 | 2280559篇 |
免费 | 153193篇 |
国内免费 | 4368篇 |
专业分类
耳鼻咽喉 | 33391篇 |
儿科学 | 72978篇 |
妇产科学 | 64437篇 |
基础医学 | 320974篇 |
口腔科学 | 67009篇 |
临床医学 | 198512篇 |
内科学 | 433257篇 |
皮肤病学 | 51818篇 |
神经病学 | 176247篇 |
特种医学 | 92048篇 |
外国民族医学 | 669篇 |
外科学 | 347745篇 |
综合类 | 49461篇 |
现状与发展 | 7篇 |
一般理论 | 678篇 |
预防医学 | 165668篇 |
眼科学 | 54529篇 |
药学 | 174700篇 |
12篇 | |
中国医学 | 5169篇 |
肿瘤学 | 128811篇 |
出版年
2018年 | 23769篇 |
2017年 | 19886篇 |
2016年 | 21275篇 |
2015年 | 24782篇 |
2014年 | 32295篇 |
2013年 | 45812篇 |
2012年 | 65340篇 |
2011年 | 64611篇 |
2010年 | 37757篇 |
2009年 | 37408篇 |
2008年 | 58991篇 |
2007年 | 64385篇 |
2006年 | 65377篇 |
2005年 | 69912篇 |
2004年 | 69294篇 |
2003年 | 63186篇 |
2002年 | 57571篇 |
2001年 | 106740篇 |
2000年 | 108170篇 |
1999年 | 93232篇 |
1998年 | 24403篇 |
1997年 | 21789篇 |
1996年 | 21348篇 |
1995年 | 20054篇 |
1994年 | 18616篇 |
1992年 | 73263篇 |
1991年 | 71190篇 |
1990年 | 70205篇 |
1989年 | 68131篇 |
1988年 | 62813篇 |
1987年 | 61579篇 |
1986年 | 58761篇 |
1985年 | 55478篇 |
1984年 | 41086篇 |
1983年 | 34823篇 |
1982年 | 19886篇 |
1981年 | 17864篇 |
1979年 | 39064篇 |
1978年 | 27252篇 |
1977年 | 23728篇 |
1976年 | 21347篇 |
1975年 | 24643篇 |
1974年 | 29337篇 |
1973年 | 28407篇 |
1972年 | 27119篇 |
1971年 | 25628篇 |
1970年 | 24034篇 |
1969年 | 23125篇 |
1968年 | 21337篇 |
1967年 | 19255篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
971.
972.
H. Draper 《Journal of Renal Care》2002,28(Z2):39-42
The majority of patients being treated for acute renal failure in intensive care units have multiple medical problems. Accordingly, the withdrawal of renal replacement therapies should be considered as part of a general decision about whether to initiate or continue with treatment per se. Several guidelines on withdrawing and withholding therapy have been produced and some common themes emerge: concerns to avoid euthanasia, potential for benefit, patient consent (shared decision‐making), team consensus/decision‐making, and the provision of appropriate palliative care and resource implications. Each of these is considered in turn, although the word limit for this paper does not permit detailed exposition. 相似文献
973.
C. Sch?fer H. H. Klünemann B. Ibach J. Mueller A. Putzhammer I. Trender-Gerhard G. Schuierer H. E. Klein 《Der Nervenarzt》2002,24(1):879-882
Wir berichten über den ersten Fall von polyzystischer lipomembran?ser Osteodysplasie oder “brain, bone and fat disease” in
Deutschland. Die nach dem Erstbeschreibern auch als Morbus J?rvi-Hakola-Nasu bezeichnete Erkrankung ist bisher vor allem in
Japan und in Finnland beschrieben worden. Einzelne F?lle wurden aus Schweden, Norwegen, Italien, Südafrika, Belgien und den
USA berichtet. Im deutschsprachigen Raum ist bisher ein Fall aus ? ver?ffentlicht worden. 相似文献
974.
975.
Neurological dysfunction of the bladder in workers exposed to dimethylaminopropionitrile 总被引:1,自引:0,他引:1
Neurogenic bladder dysfunction, characterized by hesitancy, need to strain, decreased stream, and increased duration of urination, developed in 104 (63%) of 166 employees working in the manufacture of polyurethane foam. Highest rates of illness (69%) occurred in production workers, and no illness occurred in office or warehouse workers. Onset of the epidemic coincided with introduction of a catalyst, dimethylaminopropionitrile (DMAPN), and monthly case incidence rates increased as DMAPN use increased. Outbreak ceased abruptly when DMAPN use was stopped. Of eight patients who underwent neurourologic testing during recovery, seven lacked either detrusor reflex or normal sensation of bladder filling; seven had a subclinical sensory abnormality; three had prolonged sacral-evoked responses; and two of these three had limb motor neuropathies. Dimethylaminopropionitrile is unique among known neurotoxins in producing urinary symptoms more frequently than limb nerve symptoms. 相似文献
976.
K M DeWalt 《Social science & medicine (1982)》1983,17(23):1877-1886
Although many studies as well as conventional wisdom suggest that increases in income result in improved diet and nutritional status in rural areas of developing countries, several recent studies have failed to demonstrate such a relationship. In this paper the relationships between material wealth and income and dietary strategies are examined for an agricultural community in rural Mexico. A superficial examination focusing on summary indices of dietary adequacy frequently cited in the literature and indices of wealth and income demonstrates a positive relationship between them in this community. However, an examination of the same data emphasizing alternative dietary strategies to achieve nutritional adequacy shows a more complex picture. Increasing income is associated with consumption of purchased foods especially foods of animal origin, and is not associated with the consumption of staple foods produced within the household. Diets dependent on purchased foods do not necessarily meet nutritional needs more adequately than diets which rely on agricultural products and gathered foods. Among the implications of this research are a need for a method of analysis which focuses on alternative nutritional strategies available in particular settings, and a need to reassess the relative importance of income generating activities and subsistence agriculture in areas undergoing agricultural change. 相似文献
977.
In comparative histological and cytological studies on 270 prostatic carcinoma patients highly and moderately differentiated tumors were found to be more frequent histologically than cytologically. An early and reliable sign of response to hormone therapy proved to be reticularization and vacuolization of the nuclear chromatin. Follow-up studies by means of multiple aspiration biopsies with cytologic examinations seem to be more reliable in prognostic terms than examination of the histological tumor structure. 相似文献
978.
979.
K Mahmood M N Chowdhury E A Ayoola I A Mofleh R S Rashed F Z Faleh 《Tropical gastroenterology》1991,12(4):188-191
Seventy seven antral biopsies were collected from patients attending endoscopy clinic at King Khalid University Hospital, Riyadh, Saudi Arabia during a period of six months between December 1988 to May 1989. Of these 69 (89.6%) showed chronic gastritis as well as Helicobacter-like organisms (HLOs) in the biopsy specimens while 63 (81.8%) of biopsies grew Helicobacter pylori on culture. These findings indicate a good correlation between the histological diagnosis of chronic gastritis and isolation of H. pylori on culture. 相似文献
980.
M H Eijgelshoven E R De Kloet D T Van den Berg P L Van Giersbergen 《European journal of pharmacology》1991,205(2):183-189
Evidence indicates that endogenous opioid peptides and glucocorticoids participate in the control of cardiovascular regulation during hemorrhagic shock. In the present study, we investigated a possible interaction between brain opioid peptides and adrenal corticosteroids regarding the control of arterial pressure during hemorrhage. The bleeding volumes required to lower arterial pressure to 80, 60 and 40 mmHg were studied in anesthetized sham-operated (SHAM) and adrenalectomized (ADX) rats. I.c.v. administration of 10 micrograms of naloxone resulted in a significant increase in the bleeding volume required to lower arterial pressure from 60 to 40 mmHg in SHAM animals, whereas no effect of naloxone was observed in ADX animals. Replacement therapy with a 100% corticosterone pellet (100 mg, s.c.), but not with a 12.5% corticosterone pellet (12.5 mg corticosterone and 87.5 mg cholesterol, s.c.), resulted in an effect of naloxone on the bleeding volume in ADX animals. The effect of replacement therapy could be inhibited by i.c.v. pretreatment with the synthetic glucocorticoid receptor antagonist, RU38486 (100 ng). These data suggest that (1) opioid mechanisms are involved in the regulation of blood pressure during hemorrhage, and (2) occupancy of glucocorticoid receptors is required for naloxone to exert its hemodynamic effect during hemorrhagic hypotension in ADX rats. 相似文献