全文获取类型
收费全文 | 298140篇 |
免费 | 17390篇 |
国内免费 | 419篇 |
专业分类
耳鼻咽喉 | 4228篇 |
儿科学 | 10343篇 |
妇产科学 | 10280篇 |
基础医学 | 45306篇 |
口腔科学 | 7568篇 |
临床医学 | 24277篇 |
内科学 | 56191篇 |
皮肤病学 | 6334篇 |
神经病学 | 21132篇 |
特种医学 | 11720篇 |
外国民族医学 | 43篇 |
外科学 | 46976篇 |
综合类 | 7773篇 |
现状与发展 | 1篇 |
一般理论 | 161篇 |
预防医学 | 20058篇 |
眼科学 | 6962篇 |
药学 | 21068篇 |
中国医学 | 792篇 |
肿瘤学 | 14736篇 |
出版年
2018年 | 3643篇 |
2017年 | 2682篇 |
2016年 | 3097篇 |
2015年 | 3523篇 |
2014年 | 4606篇 |
2013年 | 7279篇 |
2012年 | 9161篇 |
2011年 | 9536篇 |
2010年 | 6170篇 |
2009年 | 5593篇 |
2008年 | 8743篇 |
2007年 | 9598篇 |
2006年 | 9442篇 |
2005年 | 9037篇 |
2004年 | 8730篇 |
2003年 | 8240篇 |
2002年 | 7826篇 |
2001年 | 13380篇 |
2000年 | 13707篇 |
1999年 | 11465篇 |
1998年 | 3049篇 |
1997年 | 2798篇 |
1996年 | 2657篇 |
1995年 | 2561篇 |
1994年 | 2366篇 |
1992年 | 8354篇 |
1991年 | 8493篇 |
1990年 | 8307篇 |
1989年 | 8116篇 |
1988年 | 7367篇 |
1987年 | 7107篇 |
1986年 | 6771篇 |
1985年 | 6554篇 |
1984年 | 4788篇 |
1983年 | 4139篇 |
1982年 | 2489篇 |
1979年 | 4451篇 |
1978年 | 3241篇 |
1977年 | 2753篇 |
1976年 | 2518篇 |
1975年 | 2851篇 |
1974年 | 3373篇 |
1973年 | 3387篇 |
1972年 | 3140篇 |
1971年 | 2958篇 |
1970年 | 2857篇 |
1969年 | 2594篇 |
1968年 | 2544篇 |
1967年 | 2385篇 |
1966年 | 2279篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
992.
The effect of vitamin E on halothane-induced liver damage was studied in guinea pig halothane hepatitis. Twenty animals were divided into 3 groups, consisting of a control group, a halothane group and a vitamin E + halothane (H) group. The animals in the control group (n = 6) were allowed to inhale air only. The animals in the halothane group (n = 6) and the vitamin E + H group (n = 8) were allowed to inhale 1% halothane with air. Animals in the vitamin E + H group were additionally injected with 30 mg kg-1 of vitamin E 30 minutes prior to inhalation of halothane. Blood was aspirated from the heart immediately after sacrificing to measure the serum activity of glutamic oxaloacetic transaminase (GOT) and glutamic pyruvic transaminase (GPT). A microsomal suspension was prepared from the excised liver. Then the amount of thiobarbituric acid (TBA) reactive products in the microsomes were measured. The amount of tissue TBA-reactive products was increased by inhalation of halothane. The increase in the amount of TBA-reactive product was inhibited by the administration of vitamin E. The serum GPT activity was increased by halothane inhalation. Increased serum GOT and GPT activity were inhibited by the administration of vitamin E. These results demonstrated that vitamin E suppressed halothane-induced liver damage in the guinea pig by inhibiting lipid peroxidation. 相似文献
993.
Free hydrocortisone, hydrocortisone incorporated into microspheres and empty microspheres have been administered orally to rats with carrageenan-induced hindpaw inflammation. Hydrocortisone administered in particles was effective at a lower dose than free steroid in reducing inflammation. Inflammatory exudates were able to release steroid from the microspheres by proteolytic degradation. 相似文献
994.
G N Tsybuliak O S Nasonkin A V Chech?tkin 《Vestnik khirurgii imeni I. I. Grekova》1992,148(5):192-199
The infusion of hypertonic solution is thought by the authors to be effective due to its reflectory action for treatment of patients who are in the state of anaphylactic and cardiogenic shock. This method seems to be expedient for massive blood loss under conditions of prehospital medical aid to victims with very low level of arterial pressure, with craniocerebral trauma and critical trauma of the chest. 相似文献
995.
O. V. Fidelina O. S. Gorbatyuk I. G. Akmaev 《Bulletin of experimental biology and medicine》1998,125(3):248-250
The activity of nitroxide synthetase (NOS) was studied histochemically and levels of oxytocin and vasopressin immunocytochemically
in rat hypothalamus paraventricular nuclei in on-earth experiments simulating space flight conditions with landing. Colonization
of oxytocin and NOS was found in large-cell neurons of paraventricular nuclei. After 15 days under conditions of simulated
microgravitation followed by 1-day double gravitation and a short-term (1 day) macrogravitation, activities of NOS and content
of neuropeptides increased in large-cell neurons of paraventricular nuclei of experimental animals.
Translated fromByulleten' Eksperimental'noi Biologii i Meditsiny, Vol. 125, No. 3, pp. 282–284, March, 1998 相似文献
996.
F Tannouri F Rypens M O Peny J C Noël C Donner J Struyven F Avni 《Journal of ultrasound in medicine》1998,17(1):63-66
EFE is a rare cardiac disorder with poor prognosis and uncertain cause. Primary and secondary forms have been described. Most authors consider that all EFE is secondary--a reactive process set off in the endocardium by stress on the myocardium. We report two cases representing the primary dilated form and the secondary contracted form. The dilated form was associated with intracavitary thrombus of the left ventricle. In both cases, an unusual presence of subendocardial calcifications was noted. The ultrasonographic findings are discussed. 相似文献
997.
998.
For the empiric management of community-acquired pneumonia, ciprofloxacin (750 mg b.i.d.) was compared with two antibiotics frequently used in this indication, i.e., amoxicillin + clavulanic acid and erythromycin. One hundred and forty-two patients were randomized in this prospective study. Among them, the 63 patients with bacteriologically documented disease were evaluated. Clinical recovery was achieved in 73.3% of patients in the ciprofloxacin group (22/30) versus 81.8% of patients in the amoxicillin + clavulanic acid or erythromycin group (27/33) (non-significant difference). Clinical failures seen with ciprofloxacin were found to be correlated with recovery of Streptococcus pneumoniae. Ciprofloxacin is effective in pneumonia but should be used only in cases where Streptococcus pneumoniae can be excluded as the causative agent. 相似文献
999.
1000.
Mandabach Mark G. M.D.Section Editor: Warner David O. M.D. Editor 《Anesthesiology》2005,103(5):1106-1107