全文获取类型
收费全文 | 218594篇 |
免费 | 6986篇 |
国内免费 | 2396篇 |
专业分类
耳鼻咽喉 | 2912篇 |
儿科学 | 7686篇 |
妇产科学 | 6066篇 |
基础医学 | 27774篇 |
口腔科学 | 6338篇 |
临床医学 | 18696篇 |
内科学 | 37946篇 |
皮肤病学 | 4766篇 |
神经病学 | 12687篇 |
特种医学 | 11473篇 |
外国民族医学 | 120篇 |
外科学 | 31417篇 |
综合类 | 5855篇 |
现状与发展 | 5篇 |
一般理论 | 4篇 |
预防医学 | 18314篇 |
眼科学 | 4900篇 |
药学 | 16253篇 |
48篇 | |
中国医学 | 2317篇 |
肿瘤学 | 12399篇 |
出版年
2022年 | 1598篇 |
2021年 | 1868篇 |
2020年 | 1510篇 |
2019年 | 1181篇 |
2018年 | 4554篇 |
2017年 | 4901篇 |
2016年 | 4110篇 |
2015年 | 6238篇 |
2014年 | 5840篇 |
2013年 | 4831篇 |
2012年 | 11595篇 |
2011年 | 6704篇 |
2010年 | 3523篇 |
2009年 | 5008篇 |
2008年 | 3270篇 |
2007年 | 3881篇 |
2006年 | 4060篇 |
2005年 | 12136篇 |
2004年 | 13201篇 |
2003年 | 8766篇 |
2002年 | 3885篇 |
2001年 | 4708篇 |
2000年 | 2080篇 |
1999年 | 6243篇 |
1992年 | 6957篇 |
1991年 | 7175篇 |
1990年 | 7434篇 |
1989年 | 7007篇 |
1988年 | 6551篇 |
1987年 | 6277篇 |
1986年 | 5994篇 |
1985年 | 5267篇 |
1984年 | 3598篇 |
1983年 | 2923篇 |
1982年 | 1002篇 |
1979年 | 3844篇 |
1978年 | 2363篇 |
1977年 | 1791篇 |
1976年 | 1563篇 |
1975年 | 2484篇 |
1974年 | 3115篇 |
1973年 | 2752篇 |
1972年 | 2761篇 |
1971年 | 2751篇 |
1970年 | 2560篇 |
1969年 | 2476篇 |
1968年 | 2244篇 |
1967年 | 2169篇 |
1966年 | 1907篇 |
1965年 | 1139篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
991.
T Norstr?m 《Journal of epidemiology and community health》1988,42(4):336-340
In Part 1 of this study, the mathematical relations between micro and macro measures of effect were derived. The formulas thus obtained can be used for cross level comparisons of findings concerning the effect of some specific risk factor on, eg, mortality. The approach is illustrated by means of an empirical example relating to the association between unemployment and suicide. This relationship is estimated on micro data as well as on aggregate time series data. The findings from the two levels are fairly consistent. 相似文献
992.
993.
Issuing from the international level of the psychosomatic medicine a critical estimation of the achievements in the GDR is done. The chances for a higher degree of cooperation resulting from the organisational structure of our public health service are illustrated and with the attempt of a preliminary definition for the psychosomatic medicine at the same time a graduated way of education is indicated. The cogent reasons for the acquisition of knowledge and qualification for results and trends of psychosocial medicine derive themselves from the changed development of morbidity in the developed industrial country GDR and immediately need aimed integration. 相似文献
994.
Ectopic bone formation after total hip arthroplasty 总被引:2,自引:0,他引:2
Ectopic bone formation (EBF) is a well-known complication of total hip arthroplasty (THA). The etiology and pathogenesis are still obscure. An analysis of 119 consecutive patients with 129 primary THAs was performed to identify factors predisposing to ectopic bone formation, its frequency, and its effect on the results. Gender (male) and the duration of the operative procedure were statistically significant factors in the development of ectopic bone, which occurred in 63% of hips. The effect of grade III EBF on THA was a limited range of movement. Both local and systemic factors seem to play a role in the development of ectopic bone. Gentle handling of tissues may be important if the rate of ectopic bone is to be reduced. 相似文献
995.
The influence on macrocirculatory parameters by ultraviolet irradiation of autologous venous blood was controlled in 5 patients. The ultraviolet irradiation did not show any positive effect on different sizes of blood supply. Therefore, as a conclusion the recommendation is given in every case at first to attempt the possibilities of a reconstruction of the arterial vascular system before the use of this therapy. 相似文献
996.
J B?rsch R Luther J Preisler R Grünewald 《Zeitschrift für die gesamte innere Medizin und ihre Grenzgebiete》1988,43(5):119-121
We made a retrospective analysis with regard to the bacteriology and to the therapy of all patients with pleural empyema who were treated in the district lung hospital from 1. 1. 1982-31. 12. 1986. 92 patients had a non-specific empyema, only 3 patients had a specific empyema. All patients were aspirated repeatedly with physiological saline solution instillation and antimicrobic drug instillation in the pleural cavity. This daily aspiration and lavage was successfully in 65 patients. This method was ineffective in 30 patients. We treated 7 patients of this group by the closed drainage (rubber-tube drain), in 4 patients successfully. 3 patients had to be treated by a surgical operation. An insufficient obliteration of the cavity of empyema occurred also in 23 patients of this group. A systematic daily aspiration for a longer time led to regression of the cavity in 4 cases, whereas a surgical operation was necessary in 19 patients. We consider the daily aspiration and lavage as an effective method in patients in early acute stages of empyema. 相似文献
997.
G P Gerrits A A Haagen R A De Abreu L A Monnens F J Gabre?ls F J Trijbels A L Theeuwes J M van Baal 《Clinical chemistry》1988,34(7):1439-1442
Disturbances in the metabolism of purines and pyrimidines in neurologically affected patients can be reflected by aberrant concentrations of nucleosides and nucleobases in cerebrospinal fluid (CSF). However, normal values, especially for children at different ages, are lacking. We collected 1000 specimens of CSF from subjects ranging in age from newborn to 18 years, who were undergoing a diagnostic lumbar puncture for several clinical indications. Of these, 78 samples could be used retrospectively as a reference according to our criteria. The analyses were performed with a modified HPLC procedure. None of the substances shows age-dependency except uridine and uric acid. Uridine increases with age, and uric acid increases with age in boys older than 12 years. 相似文献
998.
Faecal lipids in familial adenomatosis coli 总被引:1,自引:0,他引:1
Faecal sterols and bile acids from six patients with familial adenomatosis coli (FPC) and 61 healthy men were analysed preoperatively. Faecal concentrations and secretion of neutral sterols, plant sterols, and degradation products of cholesterol were identical in the two groups. No increase was found in the faecal bile acid excretion, and the distribution of individual bile acids was normal in FPC. The results suggest that the development of adenomas in FPC is not associated with abnormal cholesterol and bile acid excretion. 相似文献
999.
H R B?hme A Neupert W Fischer 《Zeitschrift für die gesamte innere Medizin und ihre Grenzgebiete》1988,43(16):450-454
There are no systematic and complex investigations regarding the hemorheologic action of the betablockers propranolol and talinolol. The results on the other ones are contradictory. On the basis of a critical survey of the literature, in-vitro-experiments and studies in animals (rats) and humans may conclude that there are no remarkable deteriorations of rheological parameters in the therapeutic dose range. This is valid for diseases only where the haemodynamic regulation doesn't prevail. 相似文献
1000.