全文获取类型
收费全文 | 335篇 |
免费 | 16篇 |
国内免费 | 2篇 |
专业分类
耳鼻咽喉 | 1篇 |
儿科学 | 4篇 |
妇产科学 | 6篇 |
基础医学 | 14篇 |
临床医学 | 17篇 |
内科学 | 56篇 |
皮肤病学 | 5篇 |
神经病学 | 10篇 |
特种医学 | 39篇 |
外科学 | 43篇 |
综合类 | 122篇 |
预防医学 | 6篇 |
眼科学 | 5篇 |
药学 | 6篇 |
肿瘤学 | 19篇 |
出版年
2022年 | 2篇 |
2021年 | 1篇 |
2020年 | 1篇 |
2018年 | 2篇 |
2017年 | 1篇 |
2015年 | 8篇 |
2014年 | 11篇 |
2013年 | 3篇 |
2012年 | 13篇 |
2011年 | 4篇 |
2010年 | 6篇 |
2009年 | 18篇 |
2008年 | 20篇 |
2007年 | 11篇 |
2006年 | 21篇 |
2005年 | 8篇 |
2004年 | 12篇 |
2003年 | 10篇 |
2002年 | 9篇 |
2001年 | 17篇 |
2000年 | 8篇 |
1999年 | 9篇 |
1998年 | 24篇 |
1997年 | 28篇 |
1996年 | 20篇 |
1995年 | 6篇 |
1994年 | 11篇 |
1993年 | 4篇 |
1992年 | 5篇 |
1991年 | 5篇 |
1990年 | 4篇 |
1989年 | 7篇 |
1988年 | 10篇 |
1987年 | 1篇 |
1986年 | 4篇 |
1985年 | 7篇 |
1984年 | 1篇 |
1983年 | 3篇 |
1982年 | 2篇 |
1981年 | 5篇 |
1980年 | 3篇 |
1978年 | 3篇 |
1977年 | 1篇 |
1976年 | 1篇 |
1975年 | 3篇 |
排序方式: 共有353条查询结果,搜索用时 15 毫秒
21.
22.
Introduction: The Armed Forces personnel are exposed to various kinds of injuries due to the nature of their duties. Increase in motorized population without taking protective measures and rise in violence has contributed towards maxillofacial injuries. The aim of this study was to determine the incidence, aetiology and management of injuries resulting in fracture of the Zygomatic complex in Armed Forces personnel and their families. 相似文献
23.
24.
25.
26.
激光小角光散射仪(LALLS)由于采用了激光光源,具有光强度高、单色性强、准直性好等特点,可以在微量样品池及很低浓度的溶液中进行小角度(3°~7°)散射光强的测量,溶质的瑞利系数与其分子量有如下关系: 相似文献
27.
To determine the incidence of transfusion-associated human immunodeficiency virus (HIV) infection after routine screening of donated blood, a pilot study estimated the pretransfusion prevalence of HIV infection among blood product recipients in San Francisco. Among the 911 nonduplicate pretransfusion specimens from recipients without a clinical history of acquired immune deficiency syndrome (AIDS) or AIDS-related complex (ARC), the overall prevalence of antibody to HIV was 2.9 percent (5.2% among males and 0.6% among females; p = 0.00002). If recipients in specifically defined or possible high-risk groups (n = 348) were excluded, a seropositivity rate of 1.8 percent (10/563) was detected, with all the positives occurring in men (10/242, 4.1%) and none in women (0/321, 0%). This demonstrated prevalence of HIV infection among blood product recipients in San Francisco before transfusion was substantially higher than the known 0.02 to 0.04 percent prevalence in the donor population. Therefore, the population of women without known risk for AIDS is the best in which to assess the risk of HIV infection in patients who are currently receiving seronegative blood transfusions. 相似文献
28.
UDWADIA FE; SUNAVALA JD; JAIN MC; D'COSTA R; JAIN PK; LALL A; SEKHAR M; UDWADIA ZF; KAPADIA F; KAPUR KC; MEHTA SK; KHARAS RJ 《QJM : monthly journal of the Association of Physicians》1992,83(3):449-460
Detailed invasive haemodynamic studies were performed in 27of 32 patients with severe tetanus. Nineteen had severe uncomplicatedtetanus and eight had associated major complications, chieflyinfection and pulmonary complications. The results were comparedwith those obtained from 15 healthy male volunteers who servedas controls. There were two deaths in 32 patients (mortality6.25 per cent). Severe tetanus without major complications wascharacterized by a high output hyperkinetic circulatory statewith tachycardia (heart rate 131 (19.2) beats/minute), increasedstroke volume index (43.1 (10.7) ml/m2), increased cardiac index(5.48 (0.94)1/min/m2) and a normal left ventricular stroke workindex (60.5 (15.9) g/m/m2). Volume loading demonstrated a significanthaemodynamic response and increased vascular capacitance. Evenso the maximum percent rise from baseline values of these indicesafter volume load was significantly higher in controls (p <0.001). Autonomic cardiovascular disturbances affected bothsympathetic and parasympathetic activity. Hypertension and tachycardiaalternating with hypotension and bradycardia were related tosudden fluctuations in systemic vascular resistance. Our studiessuggested some degree of myocardial dysfunction in patientswith severe uncomplicated tetanus. The haemodynamics of severetetanus were masked and altered by complicating infection, pneumonia,and atelectasis. 相似文献
29.
Background: Poisoning is recognized as an important health problem in many countries of the world. There is incomplete information on poisoning accidents, which is a major problem in developing countries. 相似文献
30.