全文获取类型
收费全文 | 15323篇 |
免费 | 1309篇 |
国内免费 | 279篇 |
专业分类
耳鼻咽喉 | 56篇 |
儿科学 | 412篇 |
妇产科学 | 222篇 |
基础医学 | 1763篇 |
口腔科学 | 228篇 |
临床医学 | 2186篇 |
内科学 | 1917篇 |
皮肤病学 | 117篇 |
神经病学 | 951篇 |
特种医学 | 244篇 |
外国民族医学 | 3篇 |
外科学 | 684篇 |
综合类 | 1905篇 |
现状与发展 | 1篇 |
一般理论 | 1篇 |
预防医学 | 3816篇 |
眼科学 | 69篇 |
药学 | 1116篇 |
15篇 | |
中国医学 | 628篇 |
肿瘤学 | 577篇 |
出版年
2024年 | 21篇 |
2023年 | 267篇 |
2022年 | 422篇 |
2021年 | 673篇 |
2020年 | 660篇 |
2019年 | 619篇 |
2018年 | 583篇 |
2017年 | 571篇 |
2016年 | 568篇 |
2015年 | 543篇 |
2014年 | 1208篇 |
2013年 | 1310篇 |
2012年 | 983篇 |
2011年 | 1128篇 |
2010年 | 888篇 |
2009年 | 746篇 |
2008年 | 704篇 |
2007年 | 684篇 |
2006年 | 556篇 |
2005年 | 491篇 |
2004年 | 418篇 |
2003年 | 369篇 |
2002年 | 266篇 |
2001年 | 217篇 |
2000年 | 209篇 |
1999年 | 170篇 |
1998年 | 120篇 |
1997年 | 166篇 |
1996年 | 117篇 |
1995年 | 121篇 |
1994年 | 117篇 |
1993年 | 73篇 |
1992年 | 84篇 |
1991年 | 84篇 |
1990年 | 60篇 |
1989年 | 56篇 |
1988年 | 41篇 |
1987年 | 52篇 |
1986年 | 36篇 |
1985年 | 72篇 |
1984年 | 80篇 |
1983年 | 48篇 |
1982年 | 50篇 |
1981年 | 30篇 |
1980年 | 50篇 |
1979年 | 31篇 |
1978年 | 31篇 |
1976年 | 20篇 |
1975年 | 17篇 |
1973年 | 17篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
32.
Pamela H. Orr Victor Dong Marlis L. Schroeder Malcolm R. Ogborn 《Pediatric nephrology (Berlin, Germany)》1995,9(5):612-613
P1 blood group positivity has been postulated as a host factor which may provide protection against the development of post-enteropathic hemolytic uremic syndrome (HUS). In this study, blood group status in 20 Inuit survivors ofEscherichia coli 0157: H7-associated HUS was compared with age-and sex-matched controls from the same community who had experienced uncomplicated diarrheal illness due to the same pathogen. Of 20 HUS survivors, 6 were P1 antigen positive compared with 8 of the 20 controls (P=0.7). We conclude that P1 antigen positivity was not protective against HUS in this population. Further studies of this condition to clarify the role of host factors in verotoxin-induced endothelial damage are indicated. 相似文献
33.
Rh血型不合新生儿溶血病检测方法及应用 总被引:3,自引:0,他引:3
产前检测Rh,D因子及抗人球蛋白(coombs)试验是必要的。测定Rh,D因子及抗D滴度使用木瓜酶方法。通过对11261例孕妇常规检查Rh,D因子,发现D阴性74例。Rh,D阴性妇女占6.5‰。22例Rh,D阴性的孕妇所分娩的新生儿均为Rh,D阳性。其中2例孕妇血清抗D滴度为1∶32,病情严重,宫内输血无效,胎死宫内。初产妇13例,占59%。活产20例,存活率90%。Rh因子及抗人球蛋白试验方法简便、易行,一般医院均可进行。对有流产史、输血史的孕妇检查Rh因子是十分必要的。在有条件的医院,对Rh,D阴性的产妇分娩Rh,D阳性的新生儿之后,产妇应预防性注射抗D免疫球蛋白 相似文献
34.
Janice F. Munro Debra Haire-Joshu Edwin B. Fisher H. James Wedner 《The Journal of asthma》1996,33(5):313-325
Low-income minority patients from East St. Louis, Illinois, a depressed midwestern urban city, who had visited acute care settings with asthma symptoms, participated in a focus group. Questions were constructed around the Health Belief Model to characterize participants' experiences in receiving asthma care, their confidence in long-term asthma self-management, barriers they perceived to managing their asthma, and recommendations they would make for improving asthma care in their community. Analysis of comments suggests an appreciable understanding of asthma triggers, limited coping behaviors for asthma symptoms, very limited practice of active asthma management, perception of the health care system as frequently insensitive to their needs or their knowledge of their own care, exchange of well-articulated information regarding how to deal with the system, and an apparent lack of awareness of any potential contribution of patient education or support system. 相似文献
35.
喉症丸鉴定方法的研究 总被引:1,自引:1,他引:0
对不同批号喉症丸的二阶导数紫外谱线组图谱进行了测绘分析,发现不同批号的喉症丸其四溶剂二阶导数紫外吸收光谱特征数据,λmax或λsh具有很好的重现性,其分辨率高,特征性强,因此,以二阶导数紫外谱线组法控制喉症丸质量,鉴别喉症丸真伪优劣具有良好的重现性和准确性。 相似文献
36.
The conversion of multiple whole blood donors to apheresis donors is a challenge since a rapidly expanding apheresis donor base could erode homologous collections. We addressed this concern with a plan to enhance apheresis recruitment as well as donations among homologous donors with types O and B blood. Focusing the donor's attention on blood type as it relates to type-specific product needs was the basis of our approach. A matrix was used to recruit the desired types for the desired procedures (whole blood, platelet/plasma apheresis). The matrix instructed donors of blood types O, A-, and B- to primarily give whole blood and to give apheresis as a secondary donation. Donors AB, A+, and B+ were primarily directed to apheresis donations, whole blood donation being secondary. A+ and O- donors only gave their secondary donation if they were at maximum donations with the primary donation. The collections by blood type in percentages for 12 months of 1992/93 for whole blood were O+ 38.9, 0- 7.3, A+ 29.5, A- 5.7, B+ 11.9, B- 2.1, AB+ 3.7, AB+ 0.7. For apheresis it was 0+ 36.2, 0- 6.7, A+ 33.0, A- 6.6, B+ 10.4, B- 1.2, AB+ 4.9, AB+ 1.0. In 1992/93, A+ and B+ apheresis collections as compared to total apheresis collections increased by 4.9% and 13.7%, respectively. For O group apheresis donations, a decrease of 2.5% was shown and A+ whole blood donations decreased by 5.35%. During the same period of time, total apheresis collections increased by 3,058 units. We demonstrated that integration of apheresis recruitment with type-specific whole blood recruitment yielded significant increases of type-specific products. 相似文献
37.
本文对多种不同年龄组适宜的玩具进行声级监测,并根据其特点及声级特征归纳为7种类型,同时对有儿童家庭及其近邻进行了访问调查,绘出了玩具噪声对居民干扰程度图,通过对部分儿童的调查,给出了儿童对玩具噪声的主观反应情况;通过完成认知试验心理指标的测定,给出了经常使用电子游戏机学龄儿童与对照组LMT和MTS各项指标的比较,最后综合各项指标及结果提出了建议声级值,并对控制玩具噪声提出了可能的方法。 相似文献
38.
In a cohort of 3383 men aged 53 to 74 in the Copenhagen Male Study we investigated the association between ischaemic heart disease (IHD) and the Lewis blood group, assigned to chromosome 19. Among men with the Le(a-b-) phenotype, 8% had a history of non-fatal myocardial infarction, among others the frequency was 4%. The corresponding odds ratio was (95% confidence interval: CI) 1.9 (1.2-3.0) P < 0.01, men with Le(a-b-) had a risk-factor profile and pattern of disease resembling that of Reaven's syndrome X. In a subsequent prospective study 343 men with arteriosclerotic stigmas were excluded. The men had their morbidity and mortality recorded over the next 4 years. One-hundred-and-one men suffered IHD; 26 dying from IHD. In total 162 men died. Men with Le(a-b-) had an increased risk of death from IHD compared with others. Adjusted for age, relative risk (RR) (95% CI) was: 4.4 (1.9-10.3), P < 0.001, and for all causes of mortality: RR = 1.6 (1.0-2.6), P < 0.05. Men with the Le(a-b-) phenotype had an increased risk of an IHD event compared to men with other phenotypes (RR = 1.6 (0.9-2.8), P = 0.10) and a significantly higher IHD case fatality rate (RR = 2.8 (1.5-5.2), P = 0.01). The finding that the Le(a-b-) phenotype is a genetic marker of IHD risk may have implications in terms of prevention. The Le(a-b-) phenotype may also contribute to providing an explanation for the substantial ethnic differences found in the incidence of IHD. The similar risk-factor profile and pattern of disease found between Le(a-b-) men and individuals with Reaven's syndrome X is hypothesized to be due to a close genetic relationship on chromosome 19. 相似文献
39.
A. Bryskier 《Clinical microbiology and infection》2002,8(2):65-69
The worldwide spread of erythromycin A-resistant streptococci, including Streptococcus pneumoniae , is of concern. Many studies have demonstrated that the viridans group streptococci can be a reservoir of erythromycin A resistance. Within oral streptoccoci, an important difference in the susceptibility pattern has been noted. The purpose of this short editorial is to highlight the importance of this group of bacteria as a reservoir of resistance to erythromycin A and the possible transfer of resistance to S. pneumoniae and S. pyogenes. 相似文献
40.
K.M. SIVANANDAIAH V.V. SURESHBABU S.C. SHANKARAMMA 《Chemical biology & drug design》1995,45(4):377-379
Deprotection of the tert-butoxycarbonyl group during solid-phase synthesis of peptides can be conveniently and efficiently carried out using a neutral reagent, silicon tetrachloride/sodium iodide (iodotrichlorosilane). This simple and rapid method has been advantageously employed during the solid-phase synthesis of the pituitary hormone, oxytocin. 相似文献