全文获取类型
收费全文 | 46482篇 |
免费 | 3738篇 |
国内免费 | 70篇 |
专业分类
耳鼻咽喉 | 458篇 |
儿科学 | 1558篇 |
妇产科学 | 1172篇 |
基础医学 | 6089篇 |
口腔科学 | 905篇 |
临床医学 | 5732篇 |
内科学 | 8812篇 |
皮肤病学 | 753篇 |
神经病学 | 4668篇 |
特种医学 | 1591篇 |
外科学 | 5302篇 |
综合类 | 805篇 |
现状与发展 | 1篇 |
一般理论 | 66篇 |
预防医学 | 5127篇 |
眼科学 | 787篇 |
药学 | 3534篇 |
2篇 | |
中国医学 | 89篇 |
肿瘤学 | 2839篇 |
出版年
2023年 | 310篇 |
2022年 | 553篇 |
2021年 | 1068篇 |
2020年 | 695篇 |
2019年 | 1077篇 |
2018年 | 1130篇 |
2017年 | 866篇 |
2016年 | 914篇 |
2015年 | 1015篇 |
2014年 | 1405篇 |
2013年 | 1944篇 |
2012年 | 2807篇 |
2011年 | 2867篇 |
2010年 | 1534篇 |
2009年 | 1296篇 |
2008年 | 2358篇 |
2007年 | 2482篇 |
2006年 | 2278篇 |
2005年 | 2262篇 |
2004年 | 2108篇 |
2003年 | 1818篇 |
2002年 | 1711篇 |
2001年 | 1081篇 |
2000年 | 1034篇 |
1999年 | 867篇 |
1998年 | 401篇 |
1997年 | 381篇 |
1996年 | 296篇 |
1995年 | 297篇 |
1994年 | 268篇 |
1993年 | 242篇 |
1992年 | 726篇 |
1991年 | 733篇 |
1990年 | 690篇 |
1989年 | 626篇 |
1988年 | 622篇 |
1987年 | 584篇 |
1986年 | 590篇 |
1985年 | 559篇 |
1984年 | 439篇 |
1983年 | 426篇 |
1982年 | 294篇 |
1981年 | 271篇 |
1979年 | 434篇 |
1978年 | 317篇 |
1977年 | 276篇 |
1976年 | 245篇 |
1974年 | 303篇 |
1973年 | 266篇 |
1972年 | 239篇 |
排序方式: 共有10000条查询结果,搜索用时 156 毫秒
31.
Sally Urang Lorna Davis Charlotte Cram Elsberry Mary Kay Kozlowski 《Journal of Midwifery & Women's Health》1993,38(Z1):95s-99s
Fetal scalp blood sampling (FSBS), in conjunction with fetal heart rate monitoring, is a method of fetal surveillance that may avoid cesarean delivery of the healthy fetus or indicate the need for immediate delivery of a compromised fetus. Some researchers have recently begun to question the efficacy of FSBS. In this article, three nurse-midwives discuss FSBS as a tool in assessing fetal well-being during labor and consider whether FSBS is a nurse-midwifery procedure. 相似文献
32.
33.
Analysis and management of chronic testicular pain 总被引:3,自引:0,他引:3
A total of 45 patients was seen in consultation between May 1980 and April 1989 for chronic unilateral or bilateral orchialgia, defined as intermittent or constant testicular pain 3 months or longer in duration that significantly interferes with the daily activities of the patient so as to prompt him to seek medical attention. We analyzed 34 patients available for followup in terms of socioeconomic parameters, etiology and duration of pain, associated urological symptomatology, specific treatment and results of therapy. Of the patients 31 underwent surgical treatment after failing medical management (24 orchiectomies, 10 epididymectomies, 5 orchiopexies and 1 hydrocelectomy). Of 10 patients who underwent epididymectomy 9 underwent subsequent orchiectomy as definitive treatment. Of 15 patients who underwent inguinal orchiectomy 11 (73%) reported complete relief of pain, while 4 had partial relief. Of the 9 patients who underwent scrotal orchiectomy 5 (55%) reported complete relief of pain, 3 had partial relief and 1 denied improvement. On the basis of these results we recommend inguinal orchiectomy as the procedure of choice for the management of chronic testicular pain when conservative measures are unsuccessful. 相似文献
34.
Abnormal magnetic-resonance scans of the lumbar spine in asymptomatic subjects. A prospective investigation 总被引:36,自引:0,他引:36
S D Boden D O Davis T S Dina N J Patronas S W Wiesel 《The Journal of bone and joint surgery. American volume》1990,72(3):403-408
We performed magnetic resonance imaging on sixty-seven individuals who had never had low-back pain, sciatica, or neurogenic claudication. The scans were interpreted independently by three neuro-radiologists who had no knowledge about the presence or absence of clinical symptoms in the subjects. About one-third of the subjects were found to have a substantial abnormality. Of those who were less than sixty years old, 20 per cent had a herniated nucleus pulposus and one had spinal stenosis. In the group that was sixty years old or older, the findings were abnormal on about 57 per cent of the scans: 36 per cent of the subjects had a herniated nucleus pulposus and 21 per cent had spinal stenosis. There was degeneration or bulging of a disc at at least one lumbar level in 35 per cent of the subjects between twenty and thirty-nine years old and in all but one of the sixty to eighty-year-old subjects. In view of these findings in asymptomatic subjects, we concluded that abnormalities on magnetic resonance images must be strictly correlated with age and any clinical signs and symptoms before operative treatment is contemplated. 相似文献
35.
36.
37.
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
38.
39.
B A Davis D A Durden R L O'Reilly 《Progress in neuro-psychopharmacology & biological psychiatry》1991,15(4):503-512
1. The plasma concentrations of unconjugated phenylacetic acid and m-hydroxyphenylacetic acid are lower in male than in female subjects. 2. The plasma concentrations of unconjugated phenylacetic acid and mandelic acid decrease with increasing weight and height for all subjects combined. The same relationships apply for both males and females but are significant only for males. 3. Homovanillic and vanillylmandelic acid concentrations in plasma increase with age. 4. The importance of using age, sex, weight and height matched groups in studies involving the plasma concentrations of some of the trace amine metabolites in psychiatric disorders has been demonstrated. This is particularly the case for phenylacetic acid, the major metabolite of phenylethylamine which is now thought to be a neuromodulator of catecholaminergic neurotransmission. 相似文献
40.