全文获取类型
收费全文 | 36014篇 |
免费 | 2762篇 |
国内免费 | 379篇 |
专业分类
耳鼻咽喉 | 406篇 |
儿科学 | 613篇 |
妇产科学 | 563篇 |
基础医学 | 1844篇 |
口腔科学 | 597篇 |
临床医学 | 5459篇 |
内科学 | 3534篇 |
皮肤病学 | 447篇 |
神经病学 | 1472篇 |
特种医学 | 715篇 |
外国民族医学 | 1篇 |
外科学 | 2781篇 |
综合类 | 5291篇 |
预防医学 | 7454篇 |
眼科学 | 208篇 |
药学 | 4168篇 |
29篇 | |
中国医学 | 1920篇 |
肿瘤学 | 1653篇 |
出版年
2024年 | 48篇 |
2023年 | 659篇 |
2022年 | 1308篇 |
2021年 | 1684篇 |
2020年 | 1743篇 |
2019年 | 1542篇 |
2018年 | 1449篇 |
2017年 | 1298篇 |
2016年 | 1278篇 |
2015年 | 1235篇 |
2014年 | 3624篇 |
2013年 | 3085篇 |
2012年 | 2804篇 |
2011年 | 2742篇 |
2010年 | 2185篇 |
2009年 | 2128篇 |
2008年 | 1886篇 |
2007年 | 1656篇 |
2006年 | 1320篇 |
2005年 | 1063篇 |
2004年 | 828篇 |
2003年 | 655篇 |
2002年 | 461篇 |
2001年 | 354篇 |
2000年 | 338篇 |
1999年 | 282篇 |
1998年 | 202篇 |
1997年 | 204篇 |
1996年 | 154篇 |
1995年 | 139篇 |
1994年 | 113篇 |
1993年 | 87篇 |
1992年 | 69篇 |
1991年 | 66篇 |
1990年 | 41篇 |
1989年 | 33篇 |
1988年 | 35篇 |
1987年 | 27篇 |
1986年 | 20篇 |
1985年 | 40篇 |
1984年 | 57篇 |
1983年 | 22篇 |
1982年 | 25篇 |
1981年 | 22篇 |
1980年 | 30篇 |
1979年 | 16篇 |
1978年 | 17篇 |
1974年 | 13篇 |
1973年 | 14篇 |
1972年 | 11篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
71.
N Simelela 《International journal of gynaecology and obstetrics》2006,94(3):292-300
Preventing unintended pregnancies through access to modern family planning could avert 20-35% of maternal deaths, saving the lives of more than 100,000 women each year. Obstacles to wider access still exist, but they may be overcome by overt policy commitment to reproductive health services, partnership between stakeholders, community involvement and quality programs. 相似文献
72.
A. Bersano L. Candelise R. Sterzi G. Micieli M. Gattinoni A. Morabito 《Neurological sciences》2006,27(5):332-339
Abstract The future challenge for improving stroke patients’ outcome will be to implement new Stroke Units (SUs) worldwide. However
the best SU model remains uncertain. The aim of this study was to evaluate the number of SUs and the quality characteristics
of acute stroke care in Italy. We conducted a SU survey in Italy, interviewing the directors of the hospital wards that discharged
at least 50 acute stroke patients a year. A SU was defined as an acute ward area with stroke-dedicated beds and staff. To
compare the quality of care provided in SUs with that in general wards (GWs) we investigated the characteristics of five domains:
hospital setting, unit setting, staffing, process of care and diagnostic investigations. We identified 68 SUs and 677 GWs.
Multivariate logistic regression analyses demonstrated that SUs compared to GWs had higher quality scores in unit setting
(ROC area=0.9721), staffing (ROC area=0.8760) and care organisation (ROC area=0.7984). The hospital setting (ROC area=0.7033)
and the availability of rapid diagnostic investigations (ROC area=0.7164) had lower power in discriminating SU from GW. In
Italy in 2003/04 only 9% of the hospital services had organised SU care. The study demonstrated that SUs admitted more than
100 patients per year, had more monitoring equipment and staffing time, and practised multidisciplinary meetings and early
mobilisation. The utility of these structural and performance characteristics needs validation from outcome studies. 相似文献
73.
柳州市1990~2004年梅毒流行特点分析 总被引:4,自引:1,他引:3
目的:分析柳州市1990-2004年梅毒流行的特点,为今后制定防治策略提供科学依据。方法:收集了15年来各区、县每月梅毒疫情资料进行统计学分析。结果:柳州市梅毒1990年以前未发现梅毒流行,从1990~2004年发病数为9177例,发病率从1990-2004年0.06/10万-44.48/10万之间。年均增长率为130.4%,梅毒患者以早期梅毒为主,占97.06%,各年梅毒分期与性别之间的差异有显著的统计学意义(P〈0.005),发病年龄主要集中在20~29岁占总数的43.50%,各年龄组的梅毒发病差异有非常显著的统计学意义(P〈0.001);患者的文化程度以中学为多;传染来源主要是非婚性接触,占65.44%。结论:加强性病防治知识的宣传教育,提倡安全性行为,加强对高危和重点人群的监测,进一步规范梅毒的防治综合措施,以控制梅毒的流行。 相似文献
74.
顶空气相色谱法测定医用透明质酸钠凝胶中乙醇残留量 总被引:1,自引:0,他引:1
用顶空气相色谱法,测定医用透明质酸钠凝胶中乙醇残留量.采用HP-5毛细管柱;柱温:100℃;进样口温度:200℃;检测器温度:250℃;气体流速:N210ml/min,H240ml/min,Air375ml/min.结果表明:线性试验与精密度良好,回收率为96%~105%,RSD为5.6%,检出限为0.1μg/g.采用顶空气相色谱法,测定医用透明质酸钠凝胶中乙醇残留量,简便、准确. 相似文献
75.
76.
77.
大脑后动脉交通前段及其内穿支研究 总被引:2,自引:0,他引:2
本文介绍Willis动脉环后半环大脑后动脉及其内穿支的显微解剖,大脑后动脉交通前段内穿支是脑深部的重要供血血管之一,100%的病例双侧具有该血管。 相似文献
78.
J. M. Johnston P. Grondziowski R. M. Windisch R. A. Eder L. Lytle 《Acta diabetologica》1995,32(4):213-216
A feasibility study was undertaken to evaluate laboratory phlebotomists performing bedside glucose monitoring (BGM) over a
3-month period on a medical and surgical floor. Specific questions included: feasibility of providing testing on a 24-h basis,
accuracy, appropriate utilization, effect on patient care, and an analysis of cost. In all, 1975 tests were performed on 114
patients. BGM results were within 15% of the laboratory's result 97% of the time. Patient and physician satisfaction was high.
Although the cost of BGM is slightly higher than a laboratory glucose test, its use appeared to reduce the length of hospital
stay by 0.47 days. Practical information on initiating a highly successful BGM program is provided. 相似文献
79.
Rats were trained in a Y-maze on a two-choice simultaneous black-white discrimination with either black or white as S+. Animals were then transferred to one of three discrimination tasks. In task 1 (New S–), a new stimulus, either vertical or horizontal stripes, was substituted for the original S–. In task 2 (New S+), a new stimulus, either vertical or horizontal stripes as in task 1, was substituted for the original S+. In task 3 (New S+/S–) animals were trained on horizontal-vertical discrimination. The pre-trial administration of 1 mg/kg d-amphetamine facilitated the acquisition of the original black-white discrimination with both black as S+ and white as S+. Likewise, the drug improved performance in all three transfer conditions. However, the course of learning in the three transfer tasks was different in the placebo- and amphetamine-treated animals. Amphetamine-treated animals were disrupted more by a change in S+ than by a change in S–, whereas the opposite pattern was evident in the placebo controls. When both discriminative stimuli were changed, placebo animals exhibited pronounced decrement in performance, whereas amphetamine animals exhibited excellent learning. The implications of these findings for the effects of amphetamine on discrimination learning are discussed. 相似文献
80.