全文获取类型
收费全文 | 1104篇 |
免费 | 134篇 |
国内免费 | 3篇 |
专业分类
耳鼻咽喉 | 10篇 |
儿科学 | 84篇 |
妇产科学 | 22篇 |
基础医学 | 141篇 |
口腔科学 | 48篇 |
临床医学 | 106篇 |
内科学 | 221篇 |
皮肤病学 | 13篇 |
神经病学 | 141篇 |
特种医学 | 80篇 |
外科学 | 125篇 |
综合类 | 25篇 |
一般理论 | 1篇 |
预防医学 | 109篇 |
眼科学 | 20篇 |
药学 | 44篇 |
中国医学 | 3篇 |
肿瘤学 | 48篇 |
出版年
2023年 | 17篇 |
2022年 | 8篇 |
2021年 | 21篇 |
2020年 | 9篇 |
2019年 | 16篇 |
2018年 | 28篇 |
2017年 | 21篇 |
2016年 | 20篇 |
2015年 | 21篇 |
2014年 | 31篇 |
2013年 | 40篇 |
2012年 | 26篇 |
2011年 | 45篇 |
2010年 | 22篇 |
2009年 | 33篇 |
2008年 | 43篇 |
2007年 | 39篇 |
2006年 | 33篇 |
2005年 | 46篇 |
2004年 | 37篇 |
2003年 | 36篇 |
2002年 | 26篇 |
2001年 | 33篇 |
2000年 | 38篇 |
1999年 | 39篇 |
1998年 | 28篇 |
1997年 | 25篇 |
1996年 | 35篇 |
1995年 | 25篇 |
1994年 | 26篇 |
1993年 | 20篇 |
1992年 | 15篇 |
1991年 | 31篇 |
1990年 | 26篇 |
1989年 | 26篇 |
1988年 | 36篇 |
1987年 | 17篇 |
1986年 | 17篇 |
1985年 | 21篇 |
1984年 | 16篇 |
1983年 | 12篇 |
1982年 | 10篇 |
1980年 | 11篇 |
1979年 | 8篇 |
1978年 | 13篇 |
1976年 | 9篇 |
1974年 | 11篇 |
1973年 | 15篇 |
1968年 | 7篇 |
1967年 | 9篇 |
排序方式: 共有1241条查询结果,搜索用时 31 毫秒
1.
HEAD CIRCUMFERENCE AND INTELLECTUAL PERFORMANCE OF PATIENTS WITH DUCHENNE MUSCULAR DYSTROPHY 总被引:3,自引:1,他引:2
R. E. Appleton K. Bushby D. Gardner-Medwin J. Welch P. J. Kelly 《Developmental medicine and child neurology》1991,33(10):884-890
The head circumferences of 64 patients with Duchenne muscular dystrophy were measured and found to be greater than those of a normal population. The patients had relative, and in 12 cases, absolute macrocephaly. 47 of the 64 patients underwent intelligence testing and were found to be significantly intellectually impaired, particularly in verbal and language skills. There was no correlation between head circumference or absolute macrocephaly and intellectual performance. The cause of macrocephaly in these patients is unknown and its relevance to the aetiology of intellectual impairment in Duchenne muscular dystrophy is not yet clear. 相似文献
2.
The effect on the correlation coefficient of discretizing data was investigated in two ways. First, the theoretical effect of dichotomizing data was calculated, and it was shown that the resulting correlation coefficient is considerably less than that between the underlying bivariate normally distributed variables. Second, computer simulations were performed of a model in which a continuous variable (measured with some error) gives rise to a counting variable through a mechanism in which the count is zero below a certain threshold value for the continuous variable and then increases linearly as the continuous variable increases. It was shown that the correlation coefficient between the observed values of the continuous and counting variables decreased as (a) the measurement error increased, (b) the slope of the relationship decreased, and (c) the number of counts decreased. It is concluded that caution is required when interpreting correlation coefficients when one or both of the variables consist of a few (say only four or five) discrete scores. 相似文献
3.
Simultaneous video (closed circuit television [CCTV]) and EEG recordings are important in the differentiation of epileptic and non-epileptic paroxysmal episodes and in the classification of epilepsy syndromes. An additional benefit from the observation of the child on CCTV is the possible identification of specific clinical, including genetic, conditions. This three-year prospective study of 2780 consecutive children undergoing routine EEG investigations identified 17 conditions that had not previously been diagnosed by the clinicians who had requested the EEG. 相似文献
4.
5.
Elaine C McKevitt Eric Calvert Alex Ng Richard K Simons Andrew W Kirkpatrick Leanne Appleton D Ross G Brown 《Canadian journal of surgery》2003,46(3):211-215
INTRODUCTION: Elderly patients who suffer trauma have a higher mortality and use disproportionately more trauma resources than younger patients. To compare these 2 groups and determine the outcomes and characteristics of elderly patients, we reviewed patients in these 2 groups admitted and treated in our tertiary care provincial trauma centre. METHODS: From the provincial trauma registry we selected a cohort of 40 geriatric patients (group 1) (> or = 65 yr of age) with an ISS of 16 or more who were admitted to and spent time in our trauma service for more than 48 hours and compared them with a similar randomly selected cohort of 44 patients (group 2) aged 20-30 years. Family physicians were contacted for follow-up of these patients 2 years after discharge. We considered length of hospital stay, complications, disposition of the patients and use of consultation services. RESULTS: Patients in group 1 had a mean age of 72.1 years (range from 65-98 yr) and a mean ISS of 27.3 (range from 17-50). Patients in group 2 had a mean age of 26.3 years (range from 22-29 yr) and a mean ISS of 26.3 (range from 17-54). Hospital stay was significantly longer in the group 1: 34.5 days (95% confidence interval [CI]: 24-44 d) versus 21.6 days (95% CI: 15-28 d). More elderly patients experienced complications (35 v. 13, p < 0.001) and required medical consultations (35 v. 26, p < 0.001). In-hospital death rates were 8% (3 of 40) and 4% (2 of 44) respectively (p = 0.3). Fewer geriatric patients could be discharged home (35% [14 of 40] v. 27% [22 of 44], p = 0.056) or to rehabilitation facilities (28% [11 of 40] v. 34% [15 of 44], p = 0.3). Five geriatric patients were discharged to nursing homes (p = 0.007). Of the geriatric patients discharged to rehabilitation facilities or home, 75% were independent 2 years after discharge. CONCLUSIONS: Aggressive care for geriatric trauma patients is warranted, and resources should be directed toward rehabilitation. Based on our findings, we expect that creating a directed care pathway for these patients, targetting complications and earlier discharge, will further improve their outcomes. 相似文献
6.
7.
In vitro and in vivo precipitation of iodinated contrast agents when ioxaglate and papaverine are given together has been reported. To verify these reports and to investigate other medications not previously tested, the authors analyzed mixtures of contrast agents and medications in vitro with a light spectrophotometer and observed them for visible precipitates for up to 120 minutes. Previously reported incompatibilities between ionic or low-osmolality contrast media and medications were verified, and several new incompatibilities were discovered. No incompatibilities were found when the drugs tested were mixed with the new nonionic contrast media. 相似文献
8.
Sequential contrast-enhanced MR imaging of the penis 总被引:1,自引:0,他引:1
9.
Embolisation of the internal iliac artery was preformed under local anaesthesia in eight patients with severe bladder haemorrhage and in two with severe bleeding from the prostatic bed after prostatectomy. Good and effective control of the bleeding was achieved in six of the patients with bladder haemorrhage, with a partial response in the other two. Both patients with post-prostatectomy bleeding responded well to embolisation, with prompt cessation of the bleeding. This technique is recommended for the control of severe bleeding from the bladder or prostate in the seriously ill patient. 相似文献
10.
Chlamydial etiology of acute lower respiratory tract infections in children in the Sudan 总被引:2,自引:0,他引:2
B Herrmann MAM Salih BE Yousif O Abdelwahab P-A Mårdh 《Acta paediatrica (Oslo, Norway : 1992)》1994,83(2):169-172
The role of Chlamydia pneumoniae in 110 Sudanese children with signs of acute lower respiratory tract infections (ALRI) was investigated. Four (3.6%) had evidence of C. pneumoniae infection, of whom 3 were culture-positive, while 1 had an antibody response suggesting a recent infection. IgG antibodies at a titer of ≥1:32 to C. pneumoniae, Chlamydia psittaci and Chlamydia trachomatis were detected in 27 (24.5%), 27 (24.5%) and 7 (6.4%) of the 110 ALRI cases, respectively. C. pneumoniae, C. trachomatis or C. psittaci were not detected in nasopharyngeal secretions from any of 110 patients when fluorescence-labeled specific monoclonal antibodies were used. In a seroepidemiological survey, 318 healthy Sudanese persons aged between 1 month and 67 years were studied for C. pneumoniae antibodies. 相似文献