全文获取类型
收费全文 | 936篇 |
免费 | 36篇 |
国内免费 | 65篇 |
专业分类
耳鼻咽喉 | 7篇 |
儿科学 | 94篇 |
妇产科学 | 11篇 |
基础医学 | 63篇 |
口腔科学 | 38篇 |
临床医学 | 134篇 |
内科学 | 211篇 |
皮肤病学 | 23篇 |
神经病学 | 5篇 |
特种医学 | 246篇 |
外科学 | 50篇 |
综合类 | 29篇 |
预防医学 | 42篇 |
眼科学 | 14篇 |
药学 | 36篇 |
肿瘤学 | 34篇 |
出版年
2021年 | 6篇 |
2018年 | 3篇 |
2017年 | 5篇 |
2016年 | 5篇 |
2015年 | 14篇 |
2014年 | 12篇 |
2013年 | 21篇 |
2012年 | 9篇 |
2011年 | 7篇 |
2010年 | 27篇 |
2009年 | 38篇 |
2008年 | 12篇 |
2007年 | 54篇 |
2006年 | 21篇 |
2005年 | 17篇 |
2004年 | 10篇 |
2003年 | 7篇 |
2002年 | 11篇 |
2001年 | 16篇 |
2000年 | 15篇 |
1999年 | 15篇 |
1998年 | 60篇 |
1997年 | 69篇 |
1996年 | 71篇 |
1995年 | 59篇 |
1994年 | 42篇 |
1993年 | 49篇 |
1992年 | 8篇 |
1991年 | 18篇 |
1990年 | 15篇 |
1989年 | 42篇 |
1988年 | 26篇 |
1987年 | 38篇 |
1986年 | 16篇 |
1985年 | 26篇 |
1984年 | 16篇 |
1983年 | 24篇 |
1982年 | 20篇 |
1981年 | 17篇 |
1980年 | 21篇 |
1979年 | 3篇 |
1978年 | 9篇 |
1977年 | 12篇 |
1976年 | 6篇 |
1975年 | 8篇 |
1971年 | 4篇 |
1970年 | 6篇 |
1969年 | 2篇 |
1967年 | 6篇 |
1966年 | 7篇 |
排序方式: 共有1037条查询结果,搜索用时 15 毫秒
71.
72.
73.
74.
Feeding normal infants: rationale for recommendations 总被引:1,自引:0,他引:1
Fomon SJ 《Journal of the American Dietetic Association》2001,101(9):1002-1005
75.
葛根素对高血压患者血浆内皮素和一氧化氮的影响 总被引:29,自引:0,他引:29
目的:检测正常人与高血压病(EH)患者血浆内皮素、一气体氮的变化及葛根素对其的干预效应。方法:EH对照组口服苯磺酸氨氯地平5mg/d,或合和盐酸苯那普利10mg/d,每日一次,15d为一疗程。EH伍用治疗组同时合用5%GNS250ml+葛根素注射液400mg静滴,两组治疗前后检测血浆ET、NO水平变化。结果:EH各组血浆ET较正常人组均显著增高(P〈0.01),血浆NO水平及NO/ET比值除轻度E 相似文献
76.
Magill HL; Clarke EA; Fitch SJ; Boulden TF; Ramirez R; Siegle RL; Somes GW 《Radiology》1986,161(3):625-630
A multicenter clinical study was conducted using iohexol, a second-generation nonionic contrast medium, for excretory urography performed in 130 children. Doses of iohexol (300 mg iodine/ml) ranged between 150 and 660 mgI/kg (0.5 and 2.2 ml/kg). Iohexol was tolerated well, and no significant adverse reactions occurred. Sixty-five iohexol urograms were evaluated to determine the minimum dose for adequate visualization of the kidneys and collecting systems. A dose greater than 300 mgI/kg (1.0 ml/kg) always resulted in a urogram of diagnostic quality, while visualization was insufficient for diagnosis in 10% of studies done with doses of 150-300 mgI/kg (0.5-1.0 ml/kg). Another 65 iohexol urograms were compared in a blinded manner with a similar number of studies performed using iothalamate meglumine at comparable iodine concentration and dose. Visualization of calyces and pelvoinfundibular structures achieved with iohexol was rated better with statistical significance, but there was no difference in visualization of the renal parenchyma or ureters. Use of iohexol in excretory urography may be advantageous in children who are at greatest risk for an adverse reaction to contrast media or in those most likely to benefit from use of a low osmolality contrast agent. 相似文献
77.
F Haschke E E Ziegler B B Edwards S J Fomon 《Journal of pediatric gastroenterology and nutrition》1986,5(5):768-773
This study was designed to examine whether iron fortification of infant formulas has an effect on utilization of other nutrients, particularly the trace elements zinc and copper. Metabolic balance studies were performed with seven normal infants who were between 43 and 420 days of age. Two formulas of nearly identical composition except for iron concentration (10.2 and 2.5 mg/L) were fed. Each infant had four balance studies performed, two while being fed formula 10.2 and two while being fed formula 2.5, in an alternating sequence. No effect of formula iron concentration was evident on absorption and/or retention of nitrogen, fat, calcium, and magnesium. Although absorption of phosphorus was significantly (p less than 0.05) less with formula 10.2 than formula 2.5, the difference was trivial. No effect on absorption of zinc was seen. However, absorption of copper was only 13.4% (SD 13.0) of intake when formula 10.2 was fed, compared with 27.5% (SD 15.3) of intake when formula 2.5 was fed. The difference was statistically significant (p less than 0.01). We conclude that iron in amounts present in iron-fortified formulas has a measurable effect on copper utilization. Because the magnitude of the effect is relatively small, we doubt that the finding is clinically relevant. 相似文献
78.
Scales for the measurement of attitudes toward blood donation 总被引:1,自引:0,他引:1
Attitudes toward blood donation are frequently assumed to vary along a single dimension from unfavorable to favorable. In contrast, theories of attitude structure specify three distinct attitude components: affect, cognition, and behavior. This article describes the development of three new scales for the measurement of affective, cognitive, and behavioral components of attitudes toward blood donation. The scales were developed using the method of equal-appearing intervals and were administered to both donors of blood and nondonors. Correlations among the scales were relatively small and supported the three-component distinction. Affect was more strongly correlated with the number of prior donations than was cognition, which suggested an important role for emotional factors in blood donation. Scores on all three scales showed the attitudes of blood donors to be more favorable than those of nondonors. 相似文献
79.
80.