全文获取类型
收费全文 | 74537篇 |
免费 | 5277篇 |
国内免费 | 171篇 |
专业分类
耳鼻咽喉 | 949篇 |
儿科学 | 2017篇 |
妇产科学 | 1768篇 |
基础医学 | 11942篇 |
口腔科学 | 2033篇 |
临床医学 | 7468篇 |
内科学 | 14625篇 |
皮肤病学 | 1049篇 |
神经病学 | 6931篇 |
特种医学 | 3019篇 |
外国民族医学 | 45篇 |
外科学 | 9361篇 |
综合类 | 697篇 |
一般理论 | 91篇 |
预防医学 | 6245篇 |
眼科学 | 1512篇 |
药学 | 5381篇 |
中国医学 | 173篇 |
肿瘤学 | 4679篇 |
出版年
2022年 | 533篇 |
2021年 | 1146篇 |
2020年 | 748篇 |
2019年 | 1089篇 |
2018年 | 1284篇 |
2017年 | 918篇 |
2016年 | 1087篇 |
2015年 | 1296篇 |
2014年 | 1593篇 |
2013年 | 2767篇 |
2012年 | 3647篇 |
2011年 | 3845篇 |
2010年 | 2606篇 |
2009年 | 2245篇 |
2008年 | 3462篇 |
2007年 | 3675篇 |
2006年 | 3693篇 |
2005年 | 3512篇 |
2004年 | 3513篇 |
2003年 | 3215篇 |
2002年 | 3311篇 |
2001年 | 2313篇 |
2000年 | 2335篇 |
1999年 | 2115篇 |
1998年 | 1013篇 |
1997年 | 870篇 |
1996年 | 736篇 |
1995年 | 763篇 |
1994年 | 637篇 |
1993年 | 695篇 |
1992年 | 1548篇 |
1991年 | 1513篇 |
1990年 | 1430篇 |
1989年 | 1421篇 |
1988年 | 1177篇 |
1987年 | 1175篇 |
1986年 | 1115篇 |
1985年 | 1035篇 |
1984年 | 764篇 |
1983年 | 732篇 |
1982年 | 536篇 |
1981年 | 519篇 |
1980年 | 444篇 |
1979年 | 679篇 |
1978年 | 419篇 |
1977年 | 406篇 |
1975年 | 404篇 |
1974年 | 461篇 |
1973年 | 379篇 |
1972年 | 377篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
22.
Terry J DuBose 《Journal of ultrasound in medicine》2003,22(12):1420-1; author reply 1421-2
23.
24.
Abstract: Data from the National Education Longitudinal Study were combined with census data at the zip code level to examine the impact of neighborhood racial and ethnic diversity and consolidated inequality, in addition to individual, family, and school factors, on the likelihood of dropping out of high school. Results indicate that while the effects for diversity and consolidated inequality did not support the stated hypotheses, main effects for family risk and prior academic achievement were significant and in the stated direction. Also, when controlling for individual, family, school, and neighborhood characteristics, African Americans were less likely than White students to drop out of school. Implications for contextual effects research and educational outcomes are discussed. 相似文献
25.
26.
L Laforest E Van Ganse G Devouassoux S Chretin L Osman G Bauguil Y Pacheco G Chamba 《The European respiratory journal》2006,27(1):42-50
French asthma patients may be supervised by general practitioners (GPs) and/or specialists. Therefore, this study examined asthma management in patients exclusively supervised by specialists (SPE), GPs, (GP) and both (GP+SPE group), and compared the findings. Asthma patients were consecutively recruited in 348 pharmacies. Each patient completed a questionnaire providing data on personal characteristics, asthma management, perception of disease and asthma supervision. Asthma control was measured using the Asthma Control Test. Questionnaires were linked to computerised records of medications which had been dispensed before inclusion in the study. From the 1,256 patients (mean age = 36.1 yrs, 54.3% females), 11.4, 36.6, and 52.0% were placed in the SPE, GP, and GP+SPE groups, respectively. During the previous 4 weeks, most patients in the SPE group were properly controlled (52.2 versus 26.4 and 21.5% in GP and GP+SPE groups, respectively). The SPE group made more use of fixed combinations of long-acting beta agonist and inhaled corticosteroid, while receiving less short-acting beta agonists, antitussives and antibiotics. Striking differences in symptoms and asthma management were observed according to the type of asthma supervision. The current results strongly support the need to improve the management of asthma in primary care, and the coordination of care between general practitioners and specialists. 相似文献
27.
28.
Mild traumatic brain injury in an insured population: subjective complaints and return to employment 总被引:5,自引:0,他引:5
The great majority of traumatic brain injury (TBI) is of mild severity, with Glasgow Coma Scores (GCS) of 13-15, post-traumatic amnesia of less than 48 hours and brief, if any, hospitalization. All mild TBI admissions to hospital were provided with education in the form of a brief interview and a brochure on minor head trauma from the National Head Injury Foundation. Seventy-seven insured individuals with mild TBI were contacted by phone between 1 and 3 months post-injury to determine the frequency and severity of post-traumatic symptoms and the rate of return to work (RTW). Twenty-six per cent of those contacted had subjective complaints; 88% had returned to work or school; 16% of those returning did so with some symptoms. Only 45% of symptomatic individuals sought medical consultation for their condition when offered. Education about post-traumatic symptoms from the onset may provide sufficient reassurance to most individuals that future use of medical services is seen as unnecessary. Rate of RTW is relatively higher than reported in previous studies of mild TBI. 相似文献
29.
Van Landeghem G; Haese P; Lamberts L; Barata J; DeBroe M 《Nephrology, dialysis, transplantation》1997,12(8):1692-1698
Background: The association between aluminium and
dialysis encephalopathy and deterioration of the neurological state during
desferrioxamine treatment of dialysis patients is well established. At
present little is known about the speciation and the mechanisms underlying
the element's neurotoxicity. Methods. Aluminium speciation was performed in
cerebrospinal fluid samples of acutely aluminium-intoxicated dialysis
patients using a recently developed high-performance liquid
chromatographic/electro-thermal atomic absorption spectrometric hybrid
method. Results: Baseline cerebrospinal fluid
aluminium levels of samples taken shortly after the intoxication were low
but elevated (5.0±2.0 &mgr;g/l, n=3) as compared to subjects
with normal renal function (<1 &mgr;g/l). In contrast to the
situation noted in serum and to the iron speciation in cerebrospinal fluid,
aluminium was not bound to transferrin but appeared as two distinct
compounds, the main fraction eluting at the elution volume of aluminium
citrate/silicate. The second compound was not identified. Forty-four hours
after desferrioxamine administration the cerebrospinal fluid aluminium
levels had increased up to a concentration of 10.3±2.5
&mgr;g/l (n=3). This was accompanied by a change in the speciation
profile with aluminium appearing at the elution volume of aluminoxamine.
Conclusion: Our findings may contribute to a better
understanding of the neurotoxic effects of aluminium and its
desferrioxamine chelate in dialysis patients. 相似文献
30.
Evolution of the sperm aster after microinjection of isolated human sperm centrosomes into meiotically mature human oocytes 总被引:3,自引:2,他引:1
This study examined the feasibility of isolating and transferringthe centrosome-containing region of spermatozoa to mature humanoocytes. The findings demonstrate that individual sperm centrosomescan be transferred and are capable of nucleating maternal tubulinto form a well-developed sperm aster in the recipient oocyte.The results are discussed with respect to centrosome functionin early human development and applications in clinical in-vitrofertilization in the treatment of certain forms of male factorinfertility. 相似文献