全文获取类型
收费全文 | 1709篇 |
免费 | 187篇 |
国内免费 | 22篇 |
专业分类
儿科学 | 79篇 |
妇产科学 | 19篇 |
基础医学 | 155篇 |
口腔科学 | 69篇 |
临床医学 | 158篇 |
内科学 | 752篇 |
皮肤病学 | 47篇 |
神经病学 | 35篇 |
特种医学 | 243篇 |
外科学 | 101篇 |
综合类 | 42篇 |
预防医学 | 56篇 |
眼科学 | 14篇 |
药学 | 80篇 |
1篇 | |
肿瘤学 | 67篇 |
出版年
2023年 | 5篇 |
2022年 | 4篇 |
2021年 | 9篇 |
2020年 | 13篇 |
2019年 | 14篇 |
2018年 | 23篇 |
2017年 | 16篇 |
2016年 | 17篇 |
2015年 | 33篇 |
2014年 | 36篇 |
2013年 | 62篇 |
2012年 | 66篇 |
2011年 | 46篇 |
2010年 | 65篇 |
2009年 | 59篇 |
2008年 | 56篇 |
2007年 | 63篇 |
2006年 | 51篇 |
2005年 | 53篇 |
2004年 | 44篇 |
2003年 | 48篇 |
2002年 | 39篇 |
2001年 | 38篇 |
2000年 | 37篇 |
1999年 | 48篇 |
1998年 | 95篇 |
1997年 | 93篇 |
1996年 | 73篇 |
1995年 | 55篇 |
1994年 | 45篇 |
1993年 | 61篇 |
1992年 | 56篇 |
1991年 | 54篇 |
1990年 | 31篇 |
1989年 | 72篇 |
1988年 | 51篇 |
1987年 | 36篇 |
1986年 | 35篇 |
1985年 | 33篇 |
1984年 | 25篇 |
1983年 | 26篇 |
1982年 | 24篇 |
1981年 | 15篇 |
1980年 | 24篇 |
1979年 | 16篇 |
1978年 | 17篇 |
1977年 | 12篇 |
1976年 | 12篇 |
1975年 | 10篇 |
1954年 | 1篇 |
排序方式: 共有1918条查询结果,搜索用时 0 毫秒
1.
2.
3.
Pyomyositis: characteristics at CT and MR imaging 总被引:9,自引:0,他引:9
4.
5.
D De AJ Kanwar S Handa 《Journal of the European Academy of Dermatology and Venereology》2006,20(7):853-859
BACKGROUND: Diagnosis of atopic dermatitis (AD) depends on clinical features because no definitive diagnostic test exists. Criteria proposed by Hanifin and Rajka (Acta Derm Venereol (Stockh) 1980; Suppl 92: 44-47) were acceptable for hospital-based studies but were found not to be suitable for field studies. A UK working party formulated clinical diagnostic criteria that could be used in both hospital and epidemiological settings. Validation studies of the criteria showed widely variable results, probably due to different clinical settings and ethnicity. AIM AND OBJECTIVE: This study was undertaken to validate Hanifin and Rajka's criteria and to assess the comparative efficacy of their criteria and the UK working party's diagnostic criteria in the diagnosis of AD in a hospital setting in North India. SUBJECTS AND METHODS: This study serially included 101 patients with AD and 48 controls of paediatric age group. The study period was from July 2003 to December 2004. RESULTS: Hanifin and Rajka's criteria (sensitivity 96%, specificity 93.75%, positive predictive value 97% (PPV) and negative predictive value (NPV) 91.84%) had a statistical advantage over the UK working party's diagnostic criteria (sensitivity 86%, specificity 95.83%, PPV 97.75% and NPV 76.67%), with a P-value < 0.005. 相似文献
6.
SUMMARY Impotence is a common symptom which can cause considerable distress to both the sufferer and his partner. The use of pharmacotherapy to improve erectile function will continue to increase as safe and effective drugs are developed. However, restoring erectile function should not be the only treatment objective. It is also essential to address personal and emotional factors in the sufferer, conflicts in his relationship with his partner, and sexual problems in his partner, all of which may be instrumental in causing or maintaining the presenting impotence. We advocate a combined approach with appropriate medical treatment and sex and couple therapy 相似文献
7.
It is feared by many doctors that teaching basic life support (BLS) to high risk cardiac patients or a member of the family increases their anxiety. We trained a group of patients with recurrent ventricular tachycardia in BLS together with a friend or family member. Measurement of anxiety before and three months after training demonstrated a reduction in anxiety in both groups. This suggests that basic life support training can be targeted to high risk groups without fear of increasing anxiety. 相似文献
8.
9.
The changes in P-P intervals and atrioventricular nodal (AVN) conduction during the Valsalva maneuver were studied in 17 patients. In spite of a significant decrease in the sinus P-P interval during phase II of the maneuver (733 +/- 143 to 520 +/- 86 msec, p less than 0.005) and prolongation during phase IV (884 +/- 171 msec, p less than 0.01), there was no change in the AH interval (control: 78 +/- 15: phase II: 76 +/- 15: phase IV: 72 +/- 14 msec, N.S.). In six patients consecutive P-P intervals during phase II were recorded in solid-state memory and were used to trigger pacing of the high right atrium at rest. This showed a significant increase in the AH interval (75 +/- 10 to 123 +/- 45 msec, p less than 0.05). Valsalva maneuver during constant rate atrial pacing resulted in a significant decrease in the AH interval during phase II (115 +/- 36 to 80 +/- 15 msec, p less than 0.001). During phase IV there was prolongation of the AH interval (156 +/- 58 msec) but in 11 patients (61%) a variable degree of Wenckebach periodicity appeared. Thus autonomic tone modulates the changes in AVN conduction induced during physiologic heart rate variation, resulting in maintenance of adequate 1:1 AVN conduction. 相似文献
10.