全文获取类型
收费全文 | 35204篇 |
免费 | 2663篇 |
国内免费 | 95篇 |
专业分类
耳鼻咽喉 | 335篇 |
儿科学 | 1044篇 |
妇产科学 | 902篇 |
基础医学 | 5359篇 |
口腔科学 | 472篇 |
临床医学 | 5003篇 |
内科学 | 6188篇 |
皮肤病学 | 700篇 |
神经病学 | 4096篇 |
特种医学 | 809篇 |
外科学 | 3180篇 |
综合类 | 279篇 |
现状与发展 | 1篇 |
一般理论 | 33篇 |
预防医学 | 3735篇 |
眼科学 | 606篇 |
药学 | 2289篇 |
中国医学 | 42篇 |
肿瘤学 | 2889篇 |
出版年
2024年 | 32篇 |
2023年 | 282篇 |
2022年 | 430篇 |
2021年 | 894篇 |
2020年 | 601篇 |
2019年 | 933篇 |
2018年 | 1101篇 |
2017年 | 857篇 |
2016年 | 941篇 |
2015年 | 986篇 |
2014年 | 1382篇 |
2013年 | 1781篇 |
2012年 | 2813篇 |
2011年 | 2892篇 |
2010年 | 1569篇 |
2009年 | 1425篇 |
2008年 | 2440篇 |
2007年 | 2511篇 |
2006年 | 2267篇 |
2005年 | 2368篇 |
2004年 | 2105篇 |
2003年 | 1973篇 |
2002年 | 1838篇 |
2001年 | 253篇 |
2000年 | 142篇 |
1999年 | 300篇 |
1998年 | 392篇 |
1997年 | 324篇 |
1996年 | 236篇 |
1995年 | 238篇 |
1994年 | 192篇 |
1993年 | 179篇 |
1992年 | 122篇 |
1991年 | 109篇 |
1990年 | 90篇 |
1989年 | 99篇 |
1988年 | 79篇 |
1987年 | 70篇 |
1986年 | 60篇 |
1985年 | 50篇 |
1984年 | 71篇 |
1983年 | 55篇 |
1982年 | 59篇 |
1981年 | 66篇 |
1980年 | 66篇 |
1979年 | 35篇 |
1978年 | 32篇 |
1977年 | 39篇 |
1976年 | 31篇 |
1974年 | 25篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
71.
72.
73.
Peter J. Franks PhD ; Hanne Winterberg RGN DN BSc ; Christine J. Moffatt RGN PhD 《Wound repair and regeneration》2002,10(3):133-140
Little is known of the impact of pressure ulceration on adult patients' health-related quality of life. The purpose of this study was to determine the impact pressure ulceration has on pressure ulcer patients cared for in the community. A case control study design was used by drawing a random sample from patients receiving community nursing care, stratified by the presence of pressure ulceration. In all, 75 patients with pressure ulcers were compared with 100 controls without ulcers using the four-point ulcer grading scale described by United Kingdom consensus guidelines. Patients were interviewed using the Short Form-36 (SF-36) questionnaire and activities of daily living assessed using the modified Barthel scale. Patients with pressure ulcers had significantly poorer physical function (mean difference (d) = 37.6, 95% CI 28.6-46.6, p < 0.001) and social functioning (d = 33.9, 95 % CI 24.0-43.9, p < 0.001) than published age- and sex-matched normative data from the United Kingdom. The difference between cases and controls was much smaller in these domains, with neither approaching statistical significance. After adjustment for age and gender, scores for bodily pain were poorer in patients with no ulceration (d = -10.5, 95% CI - 20.6 to - 0.4, p = 0.042) indicating greater pain in these patients compared with the cases with ulceration. Activities of daily living determined by the modified Barthel scale showed reduced self-care (d = -7.6, 95% CI -12.5 to - 2.7, p = 0.010) and mobility (d = -9.2, 95% CI -14.6 to - 3.8, p = 0.001) in patients with pressure ulceration. The overall ability to perform these activities was also significantly poorer in this group (d = -16.3, 95% CI -27.3 to -5.3, p = 0.004). While patients with pressure ulceration experience some deficits in their health-related quality of life compared with a normal population, these differences are similar to those experienced by other patients receiving community nursing care. 相似文献
74.
Lipodermatosclerosis: review of cases evaluated at Mayo Clinic. 总被引:1,自引:0,他引:1
Alison J Bruce Daniel D Bennett Christine M Lohse Thom W Rooke Mark D P Davis 《Journal of the American Academy of Dermatology》2002,46(2):187-192
BACKGROUND: Lipodermatosclerosis describes bound-down, sclerotic skin involving the lower extremities. OBJECTIVE: Our purpose was to describe the demographic and clinical features of patients with lipodermatosclerosis. METHODS: This was a retrospective study of patients presenting to Mayo Clinic between 1976 and 1998 with a diagnosis of lipodermatosclerosis. RESULTS: Of 97 patients, 84 (87%) were women. Mean age was 62 years (range, 25-88 years). Mean body mass index was 34.3 (range, 17.8-71.5). Clinical signs were bilateral involvement in 44 patients (45%), induration localized to a discrete plaque in 49 (51%), erythema in 69 (71%), hyperpigmentation in 57 (59%), ulceration in 13 (13%), concomitant edema in 69 (71%), and varicosities in 55 (57%). Vascular studies performed on 72 patients showed abnormalities in 49: deep venous incompetence in 33 (67%), calf muscle pump abnormality in 19 (39%), abnormal pulsatility in 10 (20%), and obstruction in 1 (2%). CONCLUSION: Lipodermatosclerosis was associated with female sex, middle age, high body mass index, and venous abnormalities. 相似文献
75.
Christine A. Ellis Susan F. Brooks Gavin Brooks A. Tudor Evans Nicholas Morrice Fred. J. Evans Alastair Aitken 《Phytotherapy research : PTR》1987,1(4):187-190
The sapintoxins are a series of naturally occurring fluorescent phorbol esters with a range of selective biological activities (e.g. pro-inflammatory but non-tumour promoting). Their ability to activate protein kinase C (PKC) in vitro has been studied. Both tumour promoting and non-promoting phorbol derivatives activate the enzyme in vitro at low concentrations. 12-deoxyphorbol-13-phenylacetate-20 acetate (DOPPA) acts as a partial agonist in the activation of protein kinase C. Structurally distinct phorbol esters may therefore preferentially activate different forms of protein kinase C. α-sapinine, a biologically inactive compound, binds to protein kinase C without stimulating the enzyme and prevents subsequent activation by phorbol esters such as 12-O-tetradecanoyl phorbol-13-acetate (TPA). 相似文献
76.
77.
Abstract: Background : To be hit by one's intimate partner during the first year after childbirth may affect a woman's health and ability to take care of her newborn. The purpose of this study was to document the prevalence and indicators in early pregnancy of a woman being hit by her partner during the year after childbirth. Method : Information was collected by a postal questionnaire in early pregnancy and 12 months after childbirth from the approximately 5,550 women in Sweden who visited an antenatal care clinic for the first time during one of three chosen weeks in 1999 and 2000. Results : Of the 3,266 recruited women, 2,563 returned the follow‐up questionnaire. Being hit during the first year after childbirth was reported by 52 of the 2,563 (2%) women: 32 (61%) had been hit by their partner once, 12 (23%) twice, and 8 (15%) three or more times. Risk increased in women who were age 24 years or younger (3.9% had been hit), unmarried (7.1%), born in countries outside Europe (6.8%), with a partner born outside Europe (5.4%), had a low level of education (8.9%), and were unemployed (5.0%). In early pregnancy, women with back pain (4.0%), a chronic illness (4.1%), coital pain (6.1%), frequent depression‐related symptoms (8.1%), stomach pain (3.8%), or a urinary tract problem (6.3%) were hit more often than others after childbirth. Conclusions : At least 2 percent of Swedish women giving birth in 2000 were hit by their partner during the year after childbirth. Using identified predictors during antenatal care may increase the likelihood of finding women at risk, thereby enhancing the possibility of interventions to prevent this crime and health hazard. 相似文献
78.
79.
Mark B. M. Hofman Samuel A. Wickline Christine H. Lorenz 《Journal of magnetic resonance imaging : JMRI》1998,8(3):568-576
Motion of the coronary arteries during the heart cycle can result in image blurring and inaccurate flow quantification by MR. This condition applies particularly for longer acquisition windows that are typical of breath-hold coronary flow measurements. To determine the sensitivity of the technique to in-plane motion of different coronary arteries, the temporal variation in coronary position was measured in a plane perpendicular to the proximal portion of the vessel. The results indicated the presence of substantial displacement of the coronary arteries within the cardiac cycle, with a magnitude of motion approximately twice as large for the right as for the left coronary arteries. An estimation of the resulting vessel blurring was calculated, showing that the duration of the acquisition window for high spatial resolution coronary flow acquisitions should be less than 25 to 120 msec, depending on the specific coronary artery studied. In addition, these data specify optimal acquisition window placement for high resolution coronary angiography. 相似文献
80.