全文获取类型
收费全文 | 2936900篇 |
免费 | 220483篇 |
国内免费 | 4869篇 |
专业分类
耳鼻咽喉 | 41720篇 |
儿科学 | 92838篇 |
妇产科学 | 80250篇 |
基础医学 | 431957篇 |
口腔科学 | 82419篇 |
临床医学 | 264252篇 |
内科学 | 563652篇 |
皮肤病学 | 63844篇 |
神经病学 | 233394篇 |
特种医学 | 111708篇 |
外国民族医学 | 653篇 |
外科学 | 446293篇 |
综合类 | 66423篇 |
现状与发展 | 13篇 |
一般理论 | 1053篇 |
预防医学 | 230690篇 |
眼科学 | 69561篇 |
药学 | 219367篇 |
11篇 | |
中国医学 | 5807篇 |
肿瘤学 | 156347篇 |
出版年
2018年 | 31734篇 |
2017年 | 24096篇 |
2016年 | 26873篇 |
2015年 | 30516篇 |
2014年 | 43270篇 |
2013年 | 65191篇 |
2012年 | 89460篇 |
2011年 | 95005篇 |
2010年 | 56319篇 |
2009年 | 53151篇 |
2008年 | 89448篇 |
2007年 | 95692篇 |
2006年 | 96284篇 |
2005年 | 93698篇 |
2004年 | 90144篇 |
2003年 | 86920篇 |
2002年 | 84072篇 |
2001年 | 130137篇 |
2000年 | 133413篇 |
1999年 | 112431篇 |
1998年 | 33196篇 |
1997年 | 29371篇 |
1996年 | 29447篇 |
1995年 | 27794篇 |
1994年 | 25829篇 |
1993年 | 24337篇 |
1992年 | 88778篇 |
1991年 | 86929篇 |
1990年 | 85015篇 |
1989年 | 81877篇 |
1988年 | 75711篇 |
1987年 | 74228篇 |
1986年 | 69740篇 |
1985年 | 67168篇 |
1984年 | 50592篇 |
1983年 | 43163篇 |
1982年 | 26141篇 |
1981年 | 23681篇 |
1979年 | 47864篇 |
1978年 | 34328篇 |
1977年 | 28622篇 |
1976年 | 27261篇 |
1975年 | 29392篇 |
1974年 | 35657篇 |
1973年 | 33958篇 |
1972年 | 32070篇 |
1971年 | 30160篇 |
1970年 | 28099篇 |
1969年 | 27012篇 |
1968年 | 24598篇 |
排序方式: 共有10000条查询结果,搜索用时 296 毫秒
951.
952.
A prospective randomized study was done to compare the fluid contamination rates of two methods used to determine cardiac output by thermodilution under in-use conditions. Fifty patients were randomly assigned to have cardiac output measured by the capped syringe or closed loop method, and were followed with quantitative cultures of fluid and catheter. The two treatment groups (n = 25 each) were comparable in terms of age, sex, intensive care unit location, underlying diagnosis, and mean number of cardiac output determinations performed in the first 24 hours after placement of the catheter line. No differences in the rates of fluid contamination were seen at any time between the two groups. The overall fluid contamination rate was 2/124 cultures (1.8% with 95% confidence interval +/- 4.1%) with one colony of Staphylococcus epidermidis from a closed loop sample and one colony of Pseudomonas maltophilia in a capped syringe sample. Although no difference in contamination rates was documented, the closed loop system required less nursing time and effort. 相似文献
953.
Hypomagnesemia is not an infrequent finding in diuretic-induced hypokalemia. Potassium replacement therapy in these cases may be ineffective in raising serum potassium levels unless normal magnesium concentrations are restored. 相似文献
954.
955.
Endocarditis due to Kingella species 总被引:1,自引:0,他引:1
956.
Using indirect immunohistochemistry and an antiserum raised against rat corticotrophin-releasing factor (CRF) we have outlined an asymmetric network of cells and varicose fibers in sheep adrenal cortex. This network was not associated with the larger splanchnic nerves, but was occasionally found in small bundles or with blood vessels; in most instances fibers were found weaving independently through cortical parenchyma. A plexus of fibers was found in the zona reticularis, with a few fibers ramifying into adjacent medulla. Uni or bipolar cells were found throughout the cortex, with the greatest frequency at the corticomedullary junction; a multipolar-type cell was also found in this area. Staining of varicose structures and most cells was abolished by incubation with excess rat CRF 1-41, but not by ovine CRF or a range of other peptides. Though the immunoreactive species has not as yet been identified, it may thus share homology with sequences present in rat but not ovine CRF. 相似文献
957.
958.
959.
Adult coeliac disease within a defined geographic area in Sweden. A study of prevalence and associated diseases 总被引:3,自引:0,他引:3
An epidemiologic study of coeliac disease in a geographically defined area of Sweden showed that the prevalence was 95.5/10(5) inhabitants aged 15 years or more. The highest prevalence, 178/10(5) inhabitants, was found in the age group 65-74 years. The lowest prevalence, 39/10(5) inhabitants, was found in patients aged 15-24 years. Among the associated diseases an especially high incidence of associated thyroid disease was observed: thyrotoxicosis occurred in 5.0% and hypothyroidism in 5.8% of the patients. 相似文献
960.