全文获取类型
收费全文 | 1398869篇 |
免费 | 104713篇 |
国内免费 | 3069篇 |
专业分类
耳鼻咽喉 | 20297篇 |
儿科学 | 46136篇 |
妇产科学 | 36815篇 |
基础医学 | 201484篇 |
口腔科学 | 36545篇 |
临床医学 | 122468篇 |
内科学 | 279474篇 |
皮肤病学 | 31855篇 |
神经病学 | 110137篇 |
特种医学 | 58111篇 |
外国民族医学 | 660篇 |
外科学 | 211913篇 |
综合类 | 27547篇 |
现状与发展 | 4篇 |
一般理论 | 402篇 |
预防医学 | 102076篇 |
眼科学 | 30966篇 |
药学 | 105697篇 |
2篇 | |
中国医学 | 3852篇 |
肿瘤学 | 80210篇 |
出版年
2021年 | 12207篇 |
2019年 | 11883篇 |
2018年 | 16617篇 |
2017年 | 12807篇 |
2016年 | 14672篇 |
2015年 | 17625篇 |
2014年 | 23368篇 |
2013年 | 33443篇 |
2012年 | 46822篇 |
2011年 | 48409篇 |
2010年 | 28769篇 |
2009年 | 26923篇 |
2008年 | 43842篇 |
2007年 | 46085篇 |
2006年 | 45651篇 |
2005年 | 44136篇 |
2004年 | 42543篇 |
2003年 | 40749篇 |
2002年 | 39494篇 |
2001年 | 66627篇 |
2000年 | 68937篇 |
1999年 | 58295篇 |
1998年 | 15975篇 |
1997年 | 14374篇 |
1996年 | 14660篇 |
1995年 | 13857篇 |
1994年 | 13107篇 |
1993年 | 12088篇 |
1992年 | 45178篇 |
1991年 | 44055篇 |
1990年 | 42771篇 |
1989年 | 40599篇 |
1988年 | 37292篇 |
1987年 | 36631篇 |
1986年 | 33908篇 |
1985年 | 32596篇 |
1984年 | 24364篇 |
1983年 | 20434篇 |
1982年 | 11834篇 |
1981年 | 10842篇 |
1979年 | 21528篇 |
1978年 | 14963篇 |
1977年 | 12632篇 |
1976年 | 11812篇 |
1975年 | 12724篇 |
1974年 | 14786篇 |
1973年 | 14221篇 |
1972年 | 13040篇 |
1971年 | 11801篇 |
1970年 | 11110篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
11.
J. Rodríguez-Carrio A. Martínez-Zapico I. Cabezas-Rodríguez L. Benavente Á.I. Pérez-Álvarez P. López J.B. Cannata-Andía M. Naves-Díaz A. Suárez 《Nutrition, metabolism, and cardiovascular diseases : NMCD》2019,29(2):135-143
Background and aims
Since accelerated atherosclerosis has been reported in systemic lupus erythematosus (SLE), predictive biomarkers of cardiovascular disease (CVD) are needed. Among non-traditional risk factors, bone mineral density (BMD) has been related to CVD. However, its role in SLE remains controversial. This study aims to analyze the associations of subclinical atherosclerosis with traditional and non-traditional CV risk factors.Methods and results
In a cross-sectional study, atherosclerosis burden was compared between 112 female SLE patients and 31 controls. Plaque number and carotid intima-media wall thickness (cIMT) were assessed by ultrasonography. In a retrospective study, BMD determinations obtained 5-years before the ultrasonography assessment were analyzed in a subgroup of 62 patients. Plaque frequency was increased in SLE, even in patients without CV events or carotid wall thickening. cIMT was increased in patients with CVD, positively correlated with body mass index (BMI). Interestingly, a paradoxical effect of BMI on carotid parameters was observed. Whereas underweight patients (BMI < 20) showed increased prevalence of carotid plaques with low cIMT, those with BMI > 30 showed higher cIMT and plaque burden. Overweight patients (25 < BMI<30) exhibited both elevated cIMT and plaque number. BMI was an independent predictor of BMD. In our retrospective study, patients with either clinical or subclinical CVD exhibited lower BMD levels than their CV-free counterparts. A low lumbar spine BMD independently predicted CVD development after adjusting for confounders.Conclusion
SLE was associated with a higher subclinical atherosclerosis burden, a bimodal effect being observed for BMI. Decreased BMD can be a CV risk biomarker in SLE. 相似文献12.
Bernard–Soulier syndrome (BSS) is a rare autosomal recessively inherited bleeding disorder. Pregnancy in patients with BSS is characterized by ante‐, intra‐, or postpartum haemorrhage, which may be delayed and severe. There is no consensus in the management of BSS in pregnancy and so far only 16 pregnancies in nine patients have been described. We report a further three pregnancies in two women with the syndrome. We also outline our management of pregnant patients with BSS. 相似文献
13.
Lalia Y. Ibrahim Krank P. DiFilippo Geremy E. Steed Manuel D. Cerqueira 《Journal of nuclear cardiology》2006,13(6):855-866
Conclusion Several quality-control measures take place before (patient and camera preparation) and during SPECT acquisition to achieve
high-quality images. Not uncommonly, technologists and physicians are left with suboptimal images that have to be addressed
to reach the “right answer” for patient diagnosis and hence management. In many cases patients may be reimaged, especially
if the problem is detected early, but in other cases either the patient has left the nuclear laboratory or there is an inevitable
problem that, even with reimaging, will not be resolved. In these situations the technologist and physician have to seek the
available techniques to obtain the best images possible. These resources are discussed in this issue as an aid in quality
control to obtain the best possible images. 相似文献
14.
15.
16.
B Dederichs M Dietlein B Jenniches-Kloth M Schmidt P Theissen D Moka H Schicha 《Experimental and clinical endocrinology & diabetes》2006,114(7):366-370
BACKGROUND: Radioiodine therapy (RIT) combined with glucocorticoids is an effective therapy for Graves' disease, but it is debatable whether glucocorticoids should be applied in patients without Graves' ophthalmopathy (GO). METHODS: The effect of 0.4 - 0.5 mg prednisone every second day over a period of 5 weeks after RIT was monitored over a follow-up period of at least 12 months after RIT. A questionnaire was sent to 186 consecutive patients without GO concerning eye symptoms after RIT. 148 patients (80 %) answered. If eye symptoms had occurred after RIT, additional clinical examination was carried out at our outpatient clinic. The primary endpoint was the absence or onset of GO within the first year after RIT. RESULTS: Within 12 months after RIT the examination confirmed GO in 5 out of 148 patients (3.4 %). In all cases the symptoms were transient. No adverse reaction to the use of prednisone after RIT was noted. CONCLUSIONS: The risk of new GO in the first year after RIT was low and the clinical course of GO was mild when RIT was combined with a low-dose glucocorticoid regimen. Preventive administration of glucocorticoids can therefore be recommended in patients with Graves' disease even without evident GO. 相似文献
17.
M Vitacca M Paneroni L Bianchi E Clini A Vianello P Ceriana L Barbano B Balbi S Nava 《The European respiratory journal》2006,27(2):343-349
The present study compared four different sites and conditions for the measurement of maximal inspiratory pressure (MIP) and maximal expiratory pressure (MEP) in 38 spontaneous breathing tracheotomised patients. Of the patients, 28 had chronic obstructive pulmonary disease (COPD). The four different conditions were: 1) through a cuff inflated cannula (condition A); 2) through the mouth with a deflated cannula (condition B); 3) through the mouth with a phonetic uncuffed cannula (condition C); and 4) through the mouth after stoma closure (condition D). Five trials in each condition were performed using a standardised method. The measurement of both MIP and MEP differed significantly depending on the condition of measurement. MIP taken in condition A was significantly higher when compared with conditions B, C and D. MEP in condition A was significantly higher when compared with condition B and D. In condition A the highest frequency of the best measurement of MIP and MEP was observed at the fourth and fifth effort, respectively. The same results were obtained after the selection of only COPD patients. In conclusion, respiratory muscle assessment differs significantly depending on measurement condition. Measurement through inflated cannula tracheotomy yields higher values of both maximal inspiratory and maximal expiratory pressure. 相似文献
18.
Manuel P Magalh?es 《Revista portuguesa de cardiologia》2003,22(10):1197-1199
19.
20.