全文获取类型
收费全文 | 2063893篇 |
免费 | 156320篇 |
国内免费 | 3916篇 |
专业分类
耳鼻咽喉 | 27286篇 |
儿科学 | 69274篇 |
妇产科学 | 58187篇 |
基础医学 | 304425篇 |
口腔科学 | 58206篇 |
临床医学 | 191238篇 |
内科学 | 399146篇 |
皮肤病学 | 45674篇 |
神经病学 | 165360篇 |
特种医学 | 77943篇 |
外国民族医学 | 554篇 |
外科学 | 299155篇 |
综合类 | 46184篇 |
现状与发展 | 3篇 |
一般理论 | 919篇 |
预防医学 | 168601篇 |
眼科学 | 47080篇 |
药学 | 150460篇 |
9篇 | |
中国医学 | 3783篇 |
肿瘤学 | 110642篇 |
出版年
2018年 | 21843篇 |
2017年 | 16813篇 |
2016年 | 18749篇 |
2015年 | 21447篇 |
2014年 | 29573篇 |
2013年 | 45386篇 |
2012年 | 60776篇 |
2011年 | 64913篇 |
2010年 | 38109篇 |
2009年 | 36304篇 |
2008年 | 60868篇 |
2007年 | 64987篇 |
2006年 | 64970篇 |
2005年 | 63076篇 |
2004年 | 61042篇 |
2003年 | 58635篇 |
2002年 | 56752篇 |
2001年 | 91880篇 |
2000年 | 94037篇 |
1999年 | 79176篇 |
1998年 | 22483篇 |
1997年 | 20427篇 |
1996年 | 20734篇 |
1995年 | 19787篇 |
1994年 | 18394篇 |
1993年 | 17184篇 |
1992年 | 63448篇 |
1991年 | 62293篇 |
1990年 | 60974篇 |
1989年 | 58915篇 |
1988年 | 54070篇 |
1987年 | 53729篇 |
1986年 | 50787篇 |
1985年 | 48481篇 |
1984年 | 36775篇 |
1983年 | 31685篇 |
1982年 | 18948篇 |
1981年 | 17146篇 |
1979年 | 34594篇 |
1978年 | 25284篇 |
1977年 | 21228篇 |
1976年 | 19908篇 |
1975年 | 21227篇 |
1974年 | 25815篇 |
1973年 | 25156篇 |
1972年 | 23621篇 |
1971年 | 21984篇 |
1970年 | 20611篇 |
1969年 | 19347篇 |
1968年 | 17994篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
Effect of periodontal therapy on specific antibody responses to suspected periodontopathogens 总被引:1,自引:0,他引:1
J W Vincent W A Falkler W C Cornett J B Suzuki 《Journal of clinical periodontology》1987,14(7):412-417
The effects of clinically successful periodontal therapy were studied in juvenile periodontitis (JP) and rapidly progressive periodontitis (RP) patients and compared with periodontally healthy subjects (HS). Serum samples were obtained in 35 HS prior to the study and in 12 of these subjects 3-4 years later. Serum samples were obtained from 50 JP patients initially, 9 subjects immediately following surgical therapy and 29 of these subjects 3-4 years later. RP patients provided 46 initial serum samples, 9 following therapy and 27 samples 3-4 years later. Antibody levels were determined utilizing a standardized enzyme-linked immunosorbent assay with Bacteroides gingivalis, B. ochracea, Fusobacterium nucleatum and Actinobacillus actinomycetemcomitans serving as antigens. The JP patients showed an initial rise in antibody levels immediately following therapy followed by a significant decrease in antibody levels 3 to 4 years later. The RP patients did not show an early change in antibody levels but by 3 to 4 years post-therapy, antibody levels had significantly decreased. However, during this study, the antibody levels of JP and RP patients remained significantly higher when compared with HS patients. 相似文献
992.
993.
M E McMurdo 《Postgraduate medical journal》1987,63(735):37-38
Chlothorax is a rare complication of high translumbar aortography and a case is described here. 相似文献
994.
S B Wieslander B T Mortensen L Binderup N I Nissen 《European journal of haematology》1987,39(1):35-38
10 patients with CLL and 2 with CML were treated with gradually increasing doses of 1 alpha(OH)D3, up to 4 micrograms daily during 6 wk. 3 patients with preleukemia and 1 with myelofibrosis were treated with 2 micrograms daily of 1 alpha(OH)D3 for a prolonged period up to 17 wk. The treatment with 1 alpha (OH)D3 did not result in changes of disease parameters in any of the patients under study. Receptor studies for 1,25(OH)2D3 were performed in 8 CLL patients and revealed only 1 patient with increased specific receptor binding capacity. The maximum tolerable dose of 1 alpha(OH)D3 varied individually, but was in the range of 2-4 micrograms daily. 相似文献
995.
Studies were performed in hypercholesterolemic rabbits to determine whether the hydrophobic surfactant, Poloxalene 2930 (Pol), is of benefit under these conditions. Lipoprotein analyses plus chemical and morphologic studies of the aorta were performed to evaluate the results. In one study, rabbits were made hypercholesterolemic by dietary means and then divided into two groups and given a cholesterol-free diet with one group additionally given Pol with treatment continued for 10 weeks. Pol treatment resulted in less atherosclerosis but the mechanism for this effect was not apparent from lipoprotein analysis. In the other study 3 groups of rabbits were given a cholesterol-rich diet for 16 weeks. Two groups received Pol supplement with one of these groups receiving a dose that was too small to prevent hypercholesterolemia. In this group plus the group on diet alone comparable degrees of hypercholesterolemia were maintained throughout the study. Lipoprotein abnormalities were similar in these two groups except that those on Pol had a more normal cholesterol to apolipoprotein B ratio. The amount of atherosclerosis in both groups was mild but aortic cholesterol content was much less for the Pol group. It is concluded that Pol limits cholesterol accumulation in the aortic wall of hypercholesterolemic rabbits and can retard the development of atherosclerosis. 相似文献
996.
N Scopinaro E Gianetta D Friedman G F Adami E Traverso B Vitale M Castagnola G Semino M Summa V Bachi 《Gastroenterology Clinics of North America》1987,16(3):529-531
Biliopancreatic diversion is a very effective method for weight reduction. In some instances it is too effective and needs to be revised. 相似文献
997.
IgG-maleimide peroxidase, Fab'-maleimide peroxidase, polymer and monomer types of Fab'-periodate peroxidase were prepared from an antibody against rat lipoamide dehydrogenase, a component of the pyruvate dehydrogenase complex which is located in mitochondria. They were examined for immunohistochemical staining of the rat kidney. Fab'-maleimide peroxidase was the best for staining mitochondrial protein. IgG-maleimide peroxidase and the monomer type of Fab'-periodate peroxidase had the same intensity of staining. The polymer type of Fab'-periodate peroxidase could not stain the lipoamide dehydrogenase. 相似文献
998.
A significant increase of LDL-apolipoprotein B by 13% and LDL-cholesterol by 19% was observed in a group of 9 patients with hyperlipoproteinaemia Type III after bezafibrate treatment. Additional administration of colestipol caused a significant decrease of both LDL-apolipoprotein B by 18% and LDL-cholesterol by 25%. In 10 patients of hyperlipoproteinaemia Type IIb a significant decrease of both LDL-apolipoprotein B by 28% and LDL-apolipoprotein B by 18% was observed after bezafibrate therapy. When bezafibrate was given together with colestipol a further decrease of both LDL-cholesterol by 17% and LDL-apolipoprotein B by 16% occurred. HDL-cholesterol concentration increased significantly in both groups of hyperlipaemic patients during therapy. This may be the effect of both bezafibrate and colestipol. It is concluded that bile acid resins may effectively prevent the LDL-cholesterol concentration increase observed sometimes after clofibrate analogues. 相似文献
999.
1000.
Body size, fatness, and leanness of Mexican American children in Brownsville, Texas: changes between 1972 and 1983. 下载免费PDF全文
Changes in the height, weight, body mass index, triceps skinfold, and arm and estimated midarm muscle circumferences in lower socioeconomic Mexican American children, 6 through 17 years of age, from Brownsville, Texas, were documented on the basis of surveys done in 1972 and 1983. With the exception of height in youths ages 14-17, all parameters show gains at most ages, and in particular an increase in fatness. Brownsville Mexican American youth are similar in height, weight, and the body mass index to Mexican American youth in other areas of Texas. These trends confirm the large proportion of relatively short but heavy children among Mexican Americans. 相似文献