全文获取类型
收费全文 | 1689486篇 |
免费 | 118812篇 |
国内免费 | 2413篇 |
专业分类
耳鼻咽喉 | 23873篇 |
儿科学 | 57329篇 |
妇产科学 | 44990篇 |
基础医学 | 254150篇 |
口腔科学 | 43610篇 |
临床医学 | 149906篇 |
内科学 | 329720篇 |
皮肤病学 | 37426篇 |
神经病学 | 126817篇 |
特种医学 | 66511篇 |
外国民族医学 | 706篇 |
外科学 | 256438篇 |
综合类 | 33134篇 |
现状与发展 | 2篇 |
一般理论 | 471篇 |
预防医学 | 126619篇 |
眼科学 | 37679篇 |
药学 | 126596篇 |
3篇 | |
中国医学 | 3244篇 |
肿瘤学 | 91487篇 |
出版年
2018年 | 17494篇 |
2017年 | 13077篇 |
2016年 | 14640篇 |
2015年 | 16465篇 |
2014年 | 22628篇 |
2013年 | 34303篇 |
2012年 | 47963篇 |
2011年 | 51566篇 |
2010年 | 30560篇 |
2009年 | 28555篇 |
2008年 | 48809篇 |
2007年 | 52717篇 |
2006年 | 52622篇 |
2005年 | 50993篇 |
2004年 | 49791篇 |
2003年 | 48198篇 |
2002年 | 47306篇 |
2001年 | 79912篇 |
2000年 | 82704篇 |
1999年 | 69918篇 |
1998年 | 19053篇 |
1997年 | 17052篇 |
1996年 | 17472篇 |
1995年 | 16558篇 |
1994年 | 15520篇 |
1993年 | 14517篇 |
1992年 | 55220篇 |
1991年 | 55305篇 |
1990年 | 54068篇 |
1989年 | 51869篇 |
1988年 | 47799篇 |
1987年 | 47031篇 |
1986年 | 43835篇 |
1985年 | 42063篇 |
1984年 | 31378篇 |
1983年 | 26485篇 |
1982年 | 15054篇 |
1981年 | 13713篇 |
1979年 | 28437篇 |
1978年 | 19918篇 |
1977年 | 16660篇 |
1976年 | 16098篇 |
1975年 | 18012篇 |
1974年 | 20735篇 |
1973年 | 19948篇 |
1972年 | 18417篇 |
1971年 | 17035篇 |
1970年 | 16004篇 |
1969年 | 14621篇 |
1968年 | 13500篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
21.
A. Ríos A.I. López-Navas M.A. Ayala G. Garrido M.J. Sebastián J. Carrillo Á. Sánchez J. Flores-Medina J.J. Ruiz-Manzanera A.M. Hernández P. Ramírez P. Parrilla 《Transplantation proceedings》2019,51(2):258-260
The Latin American population has a double way of immigration, one toward the United States by proximity and another toward Spain by sociocultural affinity. This population increase is affecting organ donation and transplantation in receiving countries.
Objective
To analyze the brain death (BD) concept knowledge in the Dominican Republic immigrant population in Florida (United States) and Spain.Method
Population under study: Population born in the Dominican Republic, resident in Florida (United States) and in Spain. Inclusion criteria: Population older than 15 years stratified by age and sex. Assessment instrument: Donation attitude questionnaire PCID-DTO-Ríos. Fieldwork: Random selection based on stratification. Immigration support association collaboration in Florida and Spain was needed to locate potential respondents. Completion was anonymous and self-administered, with verbal consent.Results
A total of 123 respondents, 57 residents in Spain and 66 in Florida, have been included in the study. The 27% (n = 33) of the respondents knowledgeable of the BD concept consider it the death of an individual. Of the remainder, 52% (n = 64) do not know about it, and the remaining 21% (n = 26) believe it does not mean the death of a patient. No differences were observed regarding migration countries (P > .05). There was no association of the BD concept with other psychosocial factors analyzed or with the attitude toward organ donation.Conclusions
Knowledge of the BD concept among the Dominican immigrant population is similar in Spain and Florida, and, unlike most studies, there is no objective association with the attitude toward organ donation. 相似文献22.
N. SUVAJD
I V. EMERIKI‐MARTINOVI . ARANOVI M. PETROVI M. POPOVI V. ARTIKO M. UPI I. ELEZOVI 《International journal of laboratory hematology》2006,28(5):317-320
We report the case of a littoral‐cell angioma of the spleen, a recently described benign vascular tumour, whose imaging and pathological characteristics have been discussed only by a few authors. The diagnosis was made after elective splenectomy. The CT images, scintigraphy and histological specimens are presented, and differential diagnoses discussed. 相似文献
23.
24.
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
25.
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
26.
27.
28.
29.
30.
Steven V Koenen Anjoke J M Huisjes Jules Dings Yolanda van der Graaf Gerard H A Visser Hein W Bruinse 《The journal of maternal-fetal & neonatal medicine》2006,19(2):93-99
OBJECTIVE: To determine if there is a diurnal pattern in the clinical symptoms of HELLP (Hemolysis, Elevated Liver enzymes, Low Platelets) syndrome. STUDY DESIGN: A retrospective study was performed in 134 pregnancies complicated by HELLP syndrome. The medical records were reviewed to describe each HELLP episode. Time of day was divided into three periods, day, evening, and night. The following parameters were categorized according to the time of day: onset of symptoms, consultation by the doctor, initial blood sampling, diagnosis and decrease of symptoms. Biochemical parameters at clinical presentation and consecutive changes within 24 h were recorded. RESULTS: In 65 pregnancies 77 HELLP episodes were well documented. Times of onset of symptoms and consultation by the doctor were significantly higher during the evening and night (p < 0.001), whereas times of diagnosis and decrease of symptoms occurred significantly more during the day (p < 0.001). In only 49.3% of the cases were diagnostic laboratory criteria met at clinical presentation. This was mainly due to platelet values in excess of 100 x 10(9)/l. Several hours later (median 8 h, range 2-23) the decrease in platelets occurred. CONCLUSIONS: A diurnal pattern exists in the clinical symptoms of HELLP syndrome that is characterized by an exacerbation during the night and recovery during the day. There is a considerable delay between the onset of symptoms and the fulfillment of diagnostic laboratory criteria. 相似文献