全文获取类型
收费全文 | 744069篇 |
免费 | 37627篇 |
国内免费 | 866篇 |
专业分类
耳鼻咽喉 | 9520篇 |
儿科学 | 23551篇 |
妇产科学 | 16899篇 |
基础医学 | 123173篇 |
口腔科学 | 17413篇 |
临床医学 | 65541篇 |
内科学 | 142394篇 |
皮肤病学 | 17548篇 |
神经病学 | 53229篇 |
特种医学 | 26187篇 |
外国民族医学 | 152篇 |
外科学 | 104675篇 |
综合类 | 8507篇 |
现状与发展 | 2篇 |
一般理论 | 168篇 |
预防医学 | 58197篇 |
眼科学 | 16063篇 |
药学 | 56467篇 |
1篇 | |
中国医学 | 1742篇 |
肿瘤学 | 41133篇 |
出版年
2021年 | 7070篇 |
2019年 | 7433篇 |
2018年 | 12558篇 |
2017年 | 8639篇 |
2016年 | 9356篇 |
2015年 | 10362篇 |
2014年 | 12312篇 |
2013年 | 18852篇 |
2012年 | 30287篇 |
2011年 | 32088篇 |
2010年 | 17250篇 |
2009年 | 14243篇 |
2008年 | 28388篇 |
2007年 | 30957篇 |
2006年 | 29364篇 |
2005年 | 28586篇 |
2004年 | 27405篇 |
2003年 | 25782篇 |
2002年 | 24727篇 |
2001年 | 27717篇 |
2000年 | 28290篇 |
1999年 | 23696篇 |
1998年 | 6004篇 |
1997年 | 5019篇 |
1996年 | 5020篇 |
1995年 | 4706篇 |
1992年 | 17278篇 |
1991年 | 18411篇 |
1990年 | 18434篇 |
1989年 | 17922篇 |
1988年 | 16469篇 |
1987年 | 16236篇 |
1986年 | 15101篇 |
1985年 | 14440篇 |
1984年 | 10680篇 |
1983年 | 9109篇 |
1982年 | 4798篇 |
1979年 | 10065篇 |
1978年 | 7166篇 |
1977年 | 5874篇 |
1976年 | 6089篇 |
1975年 | 7357篇 |
1974年 | 8339篇 |
1973年 | 8065篇 |
1972年 | 7455篇 |
1971年 | 7157篇 |
1970年 | 6660篇 |
1969年 | 6306篇 |
1968年 | 5902篇 |
1967年 | 5247篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
Severe herpetic keratitis. I: Prevalence of visual impairment in a clinic population. 总被引:1,自引:1,他引:0 下载免费PDF全文
We report a prevalence study of the best visual acuity in the affected eye of 100 selected patients with herpetic keratitis seen during a two-year period. Sixty-two patients retained an acuity of 6/9 or better without requiring penetrating keratoplasty (PK). The prevalence of reduced visual acuity severe enough to warrant PK was 33%. Patients requiring PK for whom full clinical records were available suffered a mean of 6.8 episodes of keratitis. In this group of patients the vision of 18 fell from 6/6 to 6/60 over a mean period of 8.5 years. Once visual acuity was permanently reduced to 6/12, 78% of patients proceeded to lose vision to 6/60. Unilateral visual impairment occurs in at least a third of patients with severe herpetic keratitis. Once vision falls permanently to 6/12, the long-term prognosis for vision appears to be poor. 相似文献
82.
83.
84.
A. Giacometti O. Cirioni G. Greganti A. Fineo R. Ghiselli M. Del Prete F. Mocchegiani B. Fileni F. Caselli E. Petrelli V. Saba G. Scalise 《European journal of clinical microbiology & infectious diseases》2002,21(7):553-556
The in vitro activities of povidone iodine, potassium peroxymonosulfate, and dimethyldidecylammonium chloride were investigated
against 379 nosocomial isolates of Staphylococcus aureus and Pseudomonas aeruginosa responsible for surgical wound infections in patients operated on between July 1995 and June 2001. Overall, the isolates
were inhibited by the antiseptics at concentrations below those used routinely. In spite of increasing resistance to the various
antibiotics used to treat surgical wound infections, no significant variation in the susceptibility to antiseptics was demonstrated
during this 6-year study.
Electronic Publication 相似文献
85.
86.
87.
Deep venous thrombosis and pulmonary embolism 总被引:2,自引:0,他引:2
All surgical patients are at risk for the development of deep venous thrombosis and subsequent pulmonary embolism or postphlebitic syndrome. The evolution of ultrasonographic imaging has increased the awareness of prevention, diagnosis, and treatment of deep venous thrombosis. Duplex imaging and Doppler color flow imaging have made the diagnosis of deep venous thrombosis relatively simple, painless, inexpensive, and definitive. These procedures have gained acceptance by both patients and physicians. Several risk factors have been identified that increase the chance of the development of deep venous thrombosis. These factors include a history of deep venous thrombosis, presence of a malignant process, increasing age, cigarette smoking, obesity, prolonged bed rest, and general anesthesia. The greater the number of risk factors, the more aggressive prophylaxis should be. Means of prophylaxis have improved, and surgeons now generally agree that some form of prophylaxis is required. Heparin and intermittent compression devices appear to be equally effective in preventing deep venous thrombosis. The addition of venous monitoring in high-risk patients permits immediate identification of the presence of deep venous thrombosis. During the last decade, the treatment of patients with deep venous thrombosis has changed little. Heparin followed by warfarin remains the treatment of choice. A small group of patients receive fibrinolytic therapy for deep venous thrombosis. Although the incidence of postoperative deep venous thrombosis has decreased during the last decade, it remains a significant complication. 相似文献
88.
A total of 102 patients were examined, 32 of these with true eczema, 38 with exudative mycosis of the soles, and 32 with eczema etiologically related to a fungal infection. Analysis of the immune and biochemical reactions in the examinees has shown a marked reduction of adenyl nucleotides in the leukocytic suspension and neutrophils of patients with a mycotic infection as against those with true eczema. The lowest creatine phosphate levels were detected in the leukocytic suspension and neutrophils of the patients suffering from eczema etiologically related to mycosis and exudative mycosis of the soles. These results give grounds to search for effective corrective therapy. 相似文献
89.
This paper discusses the application of intravenous Kalipsol anesthesia in combination with Seduxen (Relanium) in 22 patients who underwent antro-mastoidectomy (expanded) and fronto-ethmoidectomy. No complications related to the method of anesthesia were identified. It is concluded that the use of Kalipsol anesthesia in urgent ENT operations provides better surgical intervention. This method ensures adequate analgesia during operation. 相似文献
90.
P G Crosignani A M Mattei C Scarduelli V Cavioni P Boracchi 《Human reproduction (Oxford, England)》1989,4(8):910-912
This paper reports the changes in prolactin levels after 12 spontaneous and 52 induced pregnancies in 54 women with unambiguous hyperprolactinaemia (median plasma prolactin levels 67.5 ng/ml, range 40-400). Twenty-three of the patients showed radiological evidence of prolactinoma. The pregnancies were induced in 37 patients by bromocriptine, in nine by metergoline, in two by lisuride and in four by other treatments. Of the 64 pregnancies, 16 ended in spontaneous abortion, while 48 went to term. Follow-up was continued for at least 6 months after delivery or until the end of lactation. In a control group of 32 hyperprolactinaemic women (median prolactin 70 ng/ml, range 40-400) not wishing to become pregnant, prolactin changes were similarly registered over a mean period of 15 months without any treatment (range 6-38 months). After pregnancy, a significant downward trend of plasma prolactin was observed in the puerperal women with a 'normalization' rate of 17%. No changes were observed in the 32 controls who did not become pregnant. 相似文献