全文获取类型
收费全文 | 988篇 |
免费 | 53篇 |
国内免费 | 35篇 |
专业分类
耳鼻咽喉 | 5篇 |
儿科学 | 74篇 |
妇产科学 | 30篇 |
基础医学 | 103篇 |
口腔科学 | 30篇 |
临床医学 | 155篇 |
内科学 | 168篇 |
皮肤病学 | 24篇 |
神经病学 | 26篇 |
特种医学 | 194篇 |
外科学 | 62篇 |
综合类 | 30篇 |
预防医学 | 48篇 |
眼科学 | 22篇 |
药学 | 67篇 |
中国医学 | 1篇 |
肿瘤学 | 37篇 |
出版年
2023年 | 2篇 |
2022年 | 4篇 |
2021年 | 9篇 |
2020年 | 3篇 |
2019年 | 10篇 |
2018年 | 19篇 |
2017年 | 13篇 |
2016年 | 12篇 |
2015年 | 21篇 |
2014年 | 15篇 |
2013年 | 34篇 |
2012年 | 18篇 |
2011年 | 19篇 |
2010年 | 44篇 |
2009年 | 46篇 |
2008年 | 24篇 |
2007年 | 33篇 |
2006年 | 24篇 |
2005年 | 48篇 |
2004年 | 25篇 |
2003年 | 17篇 |
2002年 | 18篇 |
2001年 | 25篇 |
2000年 | 18篇 |
1999年 | 24篇 |
1998年 | 51篇 |
1997年 | 49篇 |
1996年 | 52篇 |
1995年 | 35篇 |
1994年 | 41篇 |
1993年 | 36篇 |
1992年 | 17篇 |
1991年 | 16篇 |
1990年 | 10篇 |
1989年 | 28篇 |
1988年 | 47篇 |
1987年 | 23篇 |
1986年 | 18篇 |
1985年 | 32篇 |
1984年 | 9篇 |
1983年 | 6篇 |
1982年 | 6篇 |
1981年 | 14篇 |
1980年 | 10篇 |
1979年 | 9篇 |
1978年 | 7篇 |
1977年 | 8篇 |
1976年 | 13篇 |
1975年 | 3篇 |
1968年 | 3篇 |
排序方式: 共有1076条查询结果,搜索用时 203 毫秒
71.
72.
73.
74.
R A Harkness R T Geirsson I R McFadyen 《British journal of obstetrics and gynaecology》1983,90(9):815-820
Samples of amniotic fluid were obtained at caesarean section from 33 of 80 consecutive unselected patients in whom the membranes were intact. Concentrations of the ATP metabolites, hypoxanthine and xanthine, as well as uridine and urate were determined using high pressure liquid chromatography. Independent 'clinical' factors associated with reduced fetal growth and well-being were identified and the patients were assigned to one of three groups: those with no recognized risk, those with moderate risk and a small group of four patients with high risk. The mean hypoxanthine concentration was higher in the moderate-risk group than in the group with no risk. Two of the three patients with proteinuric hypertension in the high-risk group had normal hypoxanthine concentrations. There were seven patients with fetal distress, and concentrations of hypoxanthine, xanthine, uridine and urate were significantly higher in the three patients who had meconium stained amniotic fluid in addition to abnormal fetal heart rate tracings than in the remaining four who had fetal heart rate abnormalities only. It is suggested that fetal distress at emergency caesarean sections might be quantitated by such analysis. 相似文献
75.
Kinnison ML; White RI Jr; Auster M; Hewes R; Mitchell SE; Shuman L; Gallacher D 《Radiology》1985,154(2):349-351
As an alternative to performing interventional radiology on inpatients under the care of internists and surgeons, the authors have established a cardiovascular radiology admitting service for well-screened, elective patients. The patients are admitted under the care of a cardiovascular radiology fellow and a staff physician. From April 1982 to December 1983, 133 patients were admitted to the service. Patients are cared for in a surgical ward or in an intermediate unit, as determined by the clinical situation. Advantages of this approach include a broader patient referral base, improved rapport with clinical colleagues and patients, improved follow-up data, and rapid evaluation and treatment, resulting in short hospital stays. The major disadvantages involve the commitment of time and staff necessary to provide quality care. The concept of the interventional radiologist in the role of admitting physician has important implications in terms of negotiations for additional financial compensation, commensurate with the skill and time required for performing these procedures and caring for the patient. 相似文献
76.
Mqhayi MM Smit JA McFadyen ML Beksinska M Connolly C Zuma K Morroni C 《African journal of reproductive health》2004,8(2):137-144
Although contraceptives, including emergency contraceptives, are widely available free at public health facilities in South Africa, rates of teenage and unintended pregnancy are high. This paper analyses awareness and utilisation of emergency contraception amongst 193 young women (aged 15-24 years) attending public sector health facilities. Structured interviews were held at 17 and 14 primary health clinics in an urban and a rural area respectively. Respondents were asked about their knowledge of contraceptive methods and use, and specifically about emergency contraceptive utilisation. More sexually active young urban women (76%) were currently using a method of contraception, compared to the young rural women (53%). Only 17% had ever heard of emergency contraception, although significantly more in the urban area (p = 0.005) had heard of it. Only one woman from each site had ever used emergency contraception, although 39% had had unprotected intercourse in the previous year when they did not wish to conceive. Young South African women should be the focus of interventions aimed at improving awareness of the availability of emergency contraception and knowledge about its correct utilisation. 相似文献
77.
78.
OBJECTIVES: To understand the residual locomotor effects of a traumatic brain injury (TBI) on unobstructed and obstructed walking. PARTICIPANTS: Eight young, high-functioning adults with TBI and 4 healthy subjects. MAIN OUTCOME MEASURES: Spatiotemporal gait parameters and their relation to specific clinical measures of severity and locomotor and balance abilities. RESULTS: Subjects with TBI walked slower and showed a tendency for greater foot clearances in all conditions. Slower walking was due to decreased stride lengths and not cadence, while higher foot clearances were due to placing the trailing foot farther from the obstacle and increasing hip flexion angles during avoidance. CONCLUSIONS: The results suggest that this highly functional TBI population used increased caution. Measures of injury severity did not provide simple predictions of locomotor ability, but the one-legged stance test with eyes closed correlated to walking capacity. 相似文献
79.
80.