全文获取类型
收费全文 | 3197233篇 |
免费 | 390579篇 |
国内免费 | 41950篇 |
专业分类
耳鼻咽喉 | 45460篇 |
儿科学 | 92072篇 |
妇产科学 | 80087篇 |
基础医学 | 469188篇 |
口腔科学 | 89765篇 |
临床医学 | 311020篇 |
内科学 | 638158篇 |
皮肤病学 | 64206篇 |
神经病学 | 263179篇 |
特种医学 | 126587篇 |
外国民族医学 | 941篇 |
外科学 | 490239篇 |
综合类 | 113691篇 |
现状与发展 | 2篇 |
一般理论 | 1159篇 |
预防医学 | 261223篇 |
眼科学 | 85888篇 |
药学 | 273198篇 |
10篇 | |
中国医学 | 52508篇 |
肿瘤学 | 171181篇 |
出版年
2019年 | 34088篇 |
2018年 | 43343篇 |
2017年 | 37330篇 |
2016年 | 38317篇 |
2015年 | 41519篇 |
2014年 | 53551篇 |
2013年 | 74496篇 |
2012年 | 95878篇 |
2011年 | 101790篇 |
2010年 | 67644篇 |
2009年 | 70594篇 |
2008年 | 95560篇 |
2007年 | 97616篇 |
2006年 | 98370篇 |
2005年 | 95741篇 |
2004年 | 94607篇 |
2003年 | 90715篇 |
2002年 | 89413篇 |
2001年 | 154357篇 |
2000年 | 156441篇 |
1999年 | 136156篇 |
1998年 | 43638篇 |
1997年 | 39156篇 |
1996年 | 38597篇 |
1995年 | 37435篇 |
1994年 | 35508篇 |
1993年 | 32728篇 |
1992年 | 108174篇 |
1991年 | 104188篇 |
1990年 | 100307篇 |
1989年 | 97095篇 |
1988年 | 90016篇 |
1987年 | 88050篇 |
1986年 | 83287篇 |
1985年 | 79296篇 |
1984年 | 59344篇 |
1983年 | 51107篇 |
1982年 | 31751篇 |
1981年 | 28358篇 |
1979年 | 55548篇 |
1978年 | 39242篇 |
1977年 | 33866篇 |
1976年 | 31126篇 |
1975年 | 32934篇 |
1974年 | 40248篇 |
1973年 | 38141篇 |
1972年 | 36073篇 |
1971年 | 33270篇 |
1970年 | 31305篇 |
1969年 | 29117篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
992.
S J Harwood R G Carroll M Anderson B I Friedman L M Zangara A K Brunette R Kline 《Clinical nuclear medicine》1987,12(9):694-702
Thirty gallium scans, using currently acceptable dosage levels (5-6 mCi) and a conventional rotating gamma camera, were performed on 20 patients with lymphoma or infection. Compared to planar scans, SPECT increased sensitivity and lesion detection from 48% to 89% in lymphoma, and from 50% to 80% in infection. The predictive value of a negative site was 81% in lymphoma and 67% in infection. Gallium utility is markedly increased by SPECT imaging. A normal gallium SPECT scan is highly accurate in ruling out disease. 相似文献
993.
994.
Evidence for a defect in urinary concentrating ability in primary aldosteronism and its reversal by adrenal surgery 总被引:1,自引:0,他引:1
Of 15 patients with primary aldosteronism, 7 had idiopathic adrenal hyperplasia (IHA) and 8 had aldosterone-producing adenoma (APA). In order to determine any renal problems involved in the treatment, the renal clearance of these patients was analyzed and the results compared with those obtained from 12 patients with essential hypertension. With water diuresis or under antidiuresis status, levels of urine volume, Cosm and CH2O in patients with APA were greater (p less than 0.05-p less than 0.001) than those of patients with essential hypertension, while the fractional tubular sodium delivery of the former patients was lower than that of the latter patients (p less than 0.001 or less than 0.05). A similar tendency was observed in clearance studies in patients with IHA, although to a lesser extent. Adrenal surgery for patients with APA normalized these values, but administration of trilostane (3 beta-hydrosteroid dehydrogenase inhibitor) to patients with IHA failed to improve these values. These results indicate that impaired urinary concentrating ability as well as reduced urinary diluting capability is a common feature of primary aldosteronism. Such impaired renal function was improved only in patients with APA after adrenal surgery. 相似文献
995.
996.
997.
C G Watson T Kucala G Angulski P Vassar 《The Journal of nervous and mental disease》1987,175(1):34-40
This project was designed to test two hypotheses drawn from a new formulation explaining the exaggerated winter birthrate among hospitalized schizophrenics. The first is that the supposed exaggerated winter birthrate among process schizophrenics actually represents a reduction in spring-fall births caused by prenatal exposure to infectious diseases during the preceding winter--i.e., a high prenatal death rate in process preschizophrenic fetuses. The second is that the level of negative symptoms in survivors at risk for schizophrenia who were born after winters with high infectious disease rates is exaggerated. The findings provided some tentative support for this formulation. Compared with counterparts born after low-disease winters, schizophrenics born after winters with high disease incidences tended to show lower (more reactive) scores on a measure of the process-reaction dimension but higher anhedonia scores. 相似文献
998.
T Iino N Toyosaki T Katsuki T Noda T Natsume T Yaginuma S Hosoda M Furuse 《Clinical nuclear medicine》1987,12(9):688-693
The perfusion territories in polar representations of stress Tl-201 rotational myocardial imaging in patients with angina pectoris who had one diseased coronary segment were analyzed. The lesions proximal or distal to the first major septal perforator in left anterior descending arteries were detected by the presence or absence of defects at the base of the anterior septum. Right coronary artery lesions were detected by the presence of defects at the basal posterior septum, in contrast to the preservation of myocardial uptake at this portion in lesions of the left circumflex artery. The specific defect patterns were detected in cases with lesions at the first diagonal, obtuse marginal, and posterolateral branches. Recognition of these defects in the polar maps allows detailed detection of diseased coronary arterial branches. 相似文献
999.
CT evaluation of Crohn's disease: effect on patient management 总被引:8,自引:0,他引:8
E K Fishman E J Wolf B Jones T M Bayless S S Siegelman 《AJR. American journal of roentgenology》1987,148(3):537-540
CT scans from 80 consecutive patients with clinically symptomatic Crohn's disease were reviewed retrospectively to determine the effect of CT diagnosis on patient management. The initial clinical impression and any subsequent change in patient management because of the CT findings were noted. In 22 (28%) of the 80 patients, significant previously unsuspected findings led to a change in medical or surgical management. These included 12 patients with fistulae, four with abscess, two with avascular necrosis of the femoral head, two with sacral osteomyelitis, and single cases of pelvic inflammatory disease and femoral vein thrombosis. 相似文献
1000.