全文获取类型
收费全文 | 933756篇 |
免费 | 66829篇 |
国内免费 | 1356篇 |
专业分类
耳鼻咽喉 | 12971篇 |
儿科学 | 24448篇 |
妇产科学 | 23239篇 |
基础医学 | 132883篇 |
口腔科学 | 28256篇 |
临床医学 | 81232篇 |
内科学 | 184049篇 |
皮肤病学 | 19269篇 |
神经病学 | 72276篇 |
特种医学 | 36814篇 |
外国民族医学 | 79篇 |
外科学 | 152218篇 |
综合类 | 18045篇 |
现状与发展 | 1篇 |
一般理论 | 234篇 |
预防医学 | 62046篇 |
眼科学 | 21315篇 |
药学 | 72592篇 |
3篇 | |
中国医学 | 2162篇 |
肿瘤学 | 57809篇 |
出版年
2018年 | 9133篇 |
2017年 | 7198篇 |
2016年 | 7936篇 |
2015年 | 9019篇 |
2014年 | 12161篇 |
2013年 | 17677篇 |
2012年 | 24136篇 |
2011年 | 25070篇 |
2010年 | 14920篇 |
2009年 | 14470篇 |
2008年 | 24647篇 |
2007年 | 25711篇 |
2006年 | 26517篇 |
2005年 | 25468篇 |
2004年 | 24579篇 |
2003年 | 23621篇 |
2002年 | 23160篇 |
2001年 | 54754篇 |
2000年 | 56577篇 |
1999年 | 46985篇 |
1998年 | 10759篇 |
1997年 | 9483篇 |
1996年 | 9618篇 |
1995年 | 8951篇 |
1994年 | 8293篇 |
1993年 | 7606篇 |
1992年 | 35495篇 |
1991年 | 33917篇 |
1990年 | 32739篇 |
1989年 | 31874篇 |
1988年 | 28995篇 |
1987年 | 28257篇 |
1986年 | 26292篇 |
1985年 | 25148篇 |
1984年 | 17833篇 |
1983年 | 15145篇 |
1982年 | 7796篇 |
1981年 | 6771篇 |
1979年 | 15782篇 |
1978年 | 10598篇 |
1977年 | 9052篇 |
1976年 | 7871篇 |
1975年 | 8628篇 |
1974年 | 10466篇 |
1973年 | 9858篇 |
1972年 | 9357篇 |
1971年 | 8852篇 |
1970年 | 8426篇 |
1969年 | 7923篇 |
1968年 | 7200篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
971.
H Tsukuma A Oshima T Hiyama I Fujimoto H Yamano M Tanaka 《International journal of epidemiology》1987,16(4):579-583
In order to examine time trends of the prevalences of HBeAg positives among HBV carriers in Japan, we analysed data on HBeAg of HBsAg positive voluntary blood donors (23,560 males, and 8659 females) at the Osaka Red Cross Blood Centre between January 1977 and March 1984. Age-specific prevalences of HBeAg positives decreased year by year for both sexes, especially for those in their teens and twenties. The prevalences of HBeAg positives decreased with age, but at any given age it was lower for the later than for the earlier birth cohorts. Although reasons for the secular declines are unknown, the findings suggest that the prevalence of HBeAg positives among HBV carriers will continue to decrease in Japan. This, together with the immunization programme implemented this year, may lead to a future reduction in the risk of HBV related liver diseases in Japan. 相似文献
972.
D E Dwyer D R Packham T Sorrell 《The Australian and New Zealand journal of surgery》1986,56(9):689-692
The successful use of guided percutaneous needle aspiration in the management of four patients with solitary splenic abscess is described. Two patients had needle aspiration alone and two patients, with large splenic abscesses, had drainage tubes inserted. The procedures were well tolerated and allowed rapid microbiological diagnosis with selection of appropriate antibiotic therapy. The techniques were useful in patients felt to be poor anaesthetic risks, and the complications of splenectomy were avoided. 相似文献
973.
974.
975.
Human multiple sip drinking was simulated by repeated, alternate application of a NaCl solution and a second liquid to the anterior portion of the tongue. Judged intensity of the NaCl solution remained constant during alternation with artificial saliva, increased during alternation with water, and decreased during alternation with an identical NaCl solution or with no second liquid. Relative change in concentration on the tongue may determine constancy, facilitation, or adaptation during drinking. 相似文献
976.
977.
Antibiotic prophylaxis and secondary haemorrhage following transurethral resection of the prostate: a prospective trial 总被引:2,自引:0,他引:2
One hundred and sixty-two patients were studied in a random double-blind controlled trial of co-trimoxazole to prevent secondary haemorrhage following transurethral resection of the prostate (TURP). There was a significant correlation between the incidence of post-operative urinary infection and secondary haemorrhage (P less than 0.05) but no difference between the incidence of bleeding in the treatment and placebo groups. Although infection may play a role in the development of secondary haemorrhage, co-trimoxazole for 10 days does not decrease the incidence of this complication. 相似文献
978.
The cardiotoxic effects of hydralazine and prenalterol, given alone and in combination, were assessed in rats and rabbits. Acute myocardial necrosis was induced by a single administration of each drug alone in rats. However, the incidence and severity of lesions were markedly enhanced when both drugs were given in combination. Rats that received the same treatment for 10 consecutive days showed minimal or no acute necrosis, demonstrating the development of a resistance to further cardiotoxic effects of the drugs. Rabbits showed only minimal lesions when either drug was used alone and no enhancement of lesions when they were given in combination. From these data, it is concluded that the possibility of a cardiotoxic interaction exists when these drugs are used in combination and that the heavy rat (500-600 g) is a more sensitive model than the rabbit for studies of this nature. 相似文献
979.
Studies of the blood lipid peroxide status and vitamin E levels in patients with chronic active hepatitis and alcoholic liver disease 总被引:1,自引:0,他引:1
M Mézes A Pár P Németh T Jávor 《International journal of clinical pharmacology research》1986,6(4):333-338
As free radicals and lipid peroxidation are involved in the pathogenesis of different inflammatory diseases of the liver, the blood malondialdehyde content, the activity or quantity of free radical eliminating enzymes and the natural antioxidant, vitamin E serum level has been studied in ten patients with chronic active hepatitis and in six subjects with alcoholic liver disease. Thirty healthy volunteers served as controls. The serum malondialdehyde/thiobarbituric acid reactive substance and its concentrations increased significantly in both hepatitis groups. The superoxide dismutase content was also raised in the patients' sera. The serum glutathione peroxidase (GSH-Px) activity was decreased in both groups, while the red blood cell GSH-Px showed a significantly lower activity in the alcoholic hepatitis patients. Serum catalase activity and vitamin E levels in both types of chronic hepatitis were not significantly different from the healthy controls. 相似文献
980.