全文获取类型
收费全文 | 542191篇 |
免费 | 28328篇 |
国内免费 | 591篇 |
专业分类
耳鼻咽喉 | 6742篇 |
儿科学 | 17298篇 |
妇产科学 | 12863篇 |
基础医学 | 94509篇 |
口腔科学 | 12587篇 |
临床医学 | 49499篇 |
内科学 | 97937篇 |
皮肤病学 | 12031篇 |
神经病学 | 35140篇 |
特种医学 | 20193篇 |
外国民族医学 | 55篇 |
外科学 | 79764篇 |
综合类 | 7830篇 |
现状与发展 | 2篇 |
一般理论 | 119篇 |
预防医学 | 39618篇 |
眼科学 | 12136篇 |
药学 | 42231篇 |
1篇 | |
中国医学 | 1161篇 |
肿瘤学 | 29394篇 |
出版年
2021年 | 4108篇 |
2019年 | 4098篇 |
2018年 | 6007篇 |
2017年 | 4292篇 |
2016年 | 5079篇 |
2015年 | 5623篇 |
2014年 | 7486篇 |
2013年 | 11004篇 |
2012年 | 16206篇 |
2011年 | 18075篇 |
2010年 | 10352篇 |
2009年 | 9166篇 |
2008年 | 16327篇 |
2007年 | 18123篇 |
2006年 | 17609篇 |
2005年 | 16866篇 |
2004年 | 16556篇 |
2003年 | 15911篇 |
2002年 | 15381篇 |
2001年 | 22712篇 |
2000年 | 23231篇 |
1999年 | 19180篇 |
1998年 | 5379篇 |
1997年 | 4458篇 |
1996年 | 4499篇 |
1995年 | 4230篇 |
1992年 | 14547篇 |
1991年 | 15910篇 |
1990年 | 16080篇 |
1989年 | 15743篇 |
1988年 | 14421篇 |
1987年 | 14299篇 |
1986年 | 13290篇 |
1985年 | 12791篇 |
1984年 | 9498篇 |
1983年 | 8072篇 |
1982年 | 4246篇 |
1979年 | 9006篇 |
1978年 | 6434篇 |
1977年 | 5204篇 |
1976年 | 5538篇 |
1975年 | 6655篇 |
1974年 | 7453篇 |
1973年 | 7210篇 |
1972年 | 6632篇 |
1971年 | 6342篇 |
1970年 | 5917篇 |
1969年 | 5501篇 |
1968年 | 5193篇 |
1967年 | 4649篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
141.
D V Bates 《Canadian Medical Association journal》1991,144(5):554-556
142.
Circulating immune complexes in pre-eclampsia. 总被引:3,自引:0,他引:3
Serum samples from 20 non-pregnant women, 30 women with normal pregnancy and 50 women with pregnancy associated with pre-eclampsia were tested for circulating immune complexes using the polyethyleneglycol precipitation method. A highly significant positive correlation was found between circulating immune complexes and severe pre-eclampsia (BP greater than 140/90 mm Hg, albuminuria greater than 0.25 g/l). In contrast to this the difference in immune complex levels between non-pregnant subject, normal pregnancy cases and patients with mild pre-eclampsia was not statistically significant. A significant positive correlation was found between the level of circulating immune complexes and the severity of albuminuria. These findings suggest that circulating immune complexes, though not seeming to play an aetiological role in pre-eclampsia may very well be involved in its pathogenesis. 相似文献
143.
The authors suggest additional criteria evidencing inflammations in the gallbladder and colloid stability of the bile: bile acid absorption and cholesterol sedimentation coefficients. Derivation of these coefficients is based on biochemical examination of the bile with measurements of bile acid, cholesterol, and bilirubin concentrations in both portions. The results of examinations of 99 subjects evidence the diagnostic value and specificity of the characteristics, and availability of this method for clinical practice. 相似文献
144.
145.
B A Fallon B T Walsh C Sadik J B Saoud V Lukasik 《The Journal of clinical psychiatry》1991,52(6):272-278
BACKGROUND: One previous follow-up study suggested that inpatient bulimic women do quite poorly; after an interval of 2 to 5 years, only 13% were recovered. To examine the course and outcome of a sample of patients with bulimia nervosa that was severe enough to require inpatient hospitalization, the authors conducted the following study. METHOD: Women (N = 52) with DSM-III-R bulimia nervosa were sought 2 to 9 years after hospitalization. Prior to contact, a retrospective chart review was conducted to determine global functioning and admission diagnoses. At follow-up, patients participated in a 4 to 6 hour interview that assessed current and lifetime Axis I disorders (SCID-I), current Axis II disorders (PDE), eating behaviors (EAT, BSQ, EDI, PSR), global functioning (GAF), social adjustment (SAS-SR), and treatment and medical problems experienced since discharge. To assess the significance of differences between the recovered and the currently bulimic women, Yates-corrected chi-square tests and two-tailed t tests were used. RESULTS: Of the 52 women, 46 were interviewed, 1 had died, and 5 could not be located. Of the 46 interviewed women, 39% had fully recovered, 20% had partially recovered, and 41% were currently bulimic. The likelihood of recovery increased with length of time since discharge. While medical problems related to the bulimia were few, treatment with phenelzine was associated with three reports of serious hypertensive episodes, one of which led to death. Global functioning before hospitalization, lifetime DSM-III-R Axis I diagnoses, and current Axis II diagnoses were not associated with outcome. CONCLUSIONS: These findings suggest that even severely ill bulimic patients have a significant chance of achieving full recovery. 相似文献
146.
W I Schievink B Mokri V V Michels D G Piepgras 《Stroke; a journal of cerebral circulation》1991,22(11):1426-1430
BACKGROUND AND PURPOSE: The familial occurrence of intracranial aneurysms and cervical artery dissections has been described in different families and supports the hypothesis that a primary arteriopathy may play a role in the pathogenesis of these disorders. Although the basis for this arteriopathy is generally not believed to be similar among cases of intracranial aneurysms and cervical artery dissections, several similarities exist in the epidemiology of these disorders and a common underlying arterial abnormality may be suspected. SUMMARY OF REPORTS: The medical records of all 175 patients with spontaneous dissections of the cervical arteries who were seen at the Mayo Clinic between 1970 and 1989 were reviewed to identify families in which intracranial aneurysms and cervical dissections coexisted. Three families were identified in which intracranial aneurysms and cervical artery dissections were observed among siblings. These families are described in detail. CONCLUSIONS: The familial occurrence of intracranial aneurysms and cervical artery dissections within the same families provides support to the importance of a common underlying arteriopathy in the pathogenesis of both these disorders. The underlying vascular defect may, at least in some cases, be inherited. 相似文献
147.
148.
149.
150.