全文获取类型
收费全文 | 3600篇 |
免费 | 279篇 |
国内免费 | 3篇 |
专业分类
耳鼻咽喉 | 17篇 |
儿科学 | 93篇 |
妇产科学 | 66篇 |
基础医学 | 442篇 |
口腔科学 | 81篇 |
临床医学 | 333篇 |
内科学 | 566篇 |
皮肤病学 | 58篇 |
神经病学 | 479篇 |
特种医学 | 105篇 |
外科学 | 518篇 |
综合类 | 164篇 |
一般理论 | 3篇 |
预防医学 | 384篇 |
眼科学 | 25篇 |
药学 | 231篇 |
肿瘤学 | 317篇 |
出版年
2023年 | 21篇 |
2022年 | 29篇 |
2021年 | 46篇 |
2020年 | 41篇 |
2019年 | 47篇 |
2018年 | 59篇 |
2017年 | 31篇 |
2016年 | 53篇 |
2015年 | 67篇 |
2014年 | 87篇 |
2013年 | 97篇 |
2012年 | 151篇 |
2011年 | 189篇 |
2010年 | 99篇 |
2009年 | 113篇 |
2008年 | 151篇 |
2007年 | 151篇 |
2006年 | 155篇 |
2005年 | 119篇 |
2004年 | 124篇 |
2003年 | 137篇 |
2002年 | 121篇 |
2001年 | 123篇 |
2000年 | 128篇 |
1999年 | 84篇 |
1998年 | 49篇 |
1997年 | 58篇 |
1996年 | 76篇 |
1995年 | 31篇 |
1994年 | 28篇 |
1993年 | 27篇 |
1992年 | 99篇 |
1991年 | 107篇 |
1990年 | 100篇 |
1989年 | 85篇 |
1988年 | 80篇 |
1987年 | 75篇 |
1986年 | 84篇 |
1985年 | 75篇 |
1984年 | 54篇 |
1983年 | 47篇 |
1982年 | 27篇 |
1981年 | 21篇 |
1980年 | 25篇 |
1979年 | 48篇 |
1978年 | 26篇 |
1977年 | 25篇 |
1975年 | 22篇 |
1974年 | 23篇 |
1971年 | 26篇 |
排序方式: 共有3882条查询结果,搜索用时 31 毫秒
1.
2.
Mark S. Wallace Steven G. Charapata Robert Fisher Michael Byas‐Smith Peter S. Staats Martha Mayo Dawn McGuire David Ellis 《Neuromodulation》2006,9(2):75-86
Objective. The safety and efficacy of intrathecal (IT) ziconotide was studied in a randomized, double‐blind, placebo‐controlled trial. Materials and Methods. Patients (169 ziconotide, 86 placebo) with severe chronic nonmalignant pain unresponsive to conventional therapy and a visual analog scale of pain intensity (VASPI score) ≥ 50 mm were treated over a 6‐day period in an inpatient hospital setting. Initial starting dose was 0.4 µg/hour and was titrated to analgesia or intolerance (maximum dose 7.0 µg/hour). The starting and maximum doses were reduced to 0.1 µg/hour and 2.4 µg/hour, respectively, due to adverse events (AEs). Results. The mean percent reduction in VASPI score from baseline was 31.2% and 6.0% for ziconotide‐ and placebo‐treated patients, respectively (p ≤ 0.001). During the initial titration phase, a significantly greater percentage of patients in the ziconotide group compared to the placebo group reported AEs, including abnormal gait, amblyopia, dizziness, nausea, nystagmus, pain, urinary retention, and vomiting. Conclusion. Ziconotide provided significant analgesia in patients for whom conventional therapy failed. However, there was a considerable incidence of ziconotide‐associated AEs due to the rapid titration and high doses administered. 相似文献
3.
A study was conducted to evaluate the efficacy of family history factors as screening criteria for childhood hypercholesterolemia. When they were seen for routine care at one of eight office practices, 1005 prepubertal children underwent random serum cholesterol determinations. Parental and grandparental histories of cardiovascular risk factors and atherosclerotic complications prior to 55 years of age were also obtained. Of the initial group, 274 children had total cholesterol levels greater than or equal to 175 mg/dL, and 175 of these children returned for retesting after an overnight fast. A total of 88 children were found to have low-density lipoprotein-cholesterol (LDL-C) values greater than or equal to 90th percentile for age and sex. Maternal and paternal histories of hypercholesterolemia were significantly associated with elevated LDL-C (odds ratio = 7.3 and 2.9, respectively), but had extremely low sensitivities (0.09, 0.15) despite modest positive predictive values (0.42, 0.22). Grandparental histories of sudden death, peripheral vascular disease, and gout were associated with elevated LDL-C, but sensitivities and positive predictive values for all of these factors were less than 0.22. Family history factors most commonly recommended as criteria for cholesterol screening in children did not identify half of all the children with elevated LDL-C and did not selectively identify the most severely affected children. Adding information concerning the presence of childhood obesity did not result in appreciable improvement in LDL-C detection beyond that achieved by family history factors alone. It was concluded that if thorough identification of young children with elevated LDL-C is desired, inclusive population screening rather than a family history-based strategy would be the most effective approach. 相似文献
4.
Magnetic resonance imaging in planning limb-salvage surgery for primary malignant tumors of bone 总被引:4,自引:0,他引:4
M Sundaram M H McGuire D R Herbold M K Wolverson E Heiberg 《The Journal of bone and joint surgery. American volume》1986,68(6):809-819
In defining the linear extent of a malignant tumor in a long bone, radiographs, computerized tomography, and scintigraphy are routinely employed, especially when non-ablative surgery is being considered. The drawbacks of these modalities in defining the true intracompartmental extent of disease within a bone can largely be overcome with the use of magnetic resonance imaging. We did a prospective analysis of magnetic resonance imaging in sixteen consecutive patients with a primary malignant tumor of a long bone, and it showed that this modality has clinical promise of being more precise than the other modalities in defining the true proximal and distal extent of a tumor in a long bone. Coronal images permit easier planning of surgical techniques for salvage of a limb using an allograft than do a multiplicity of transverse images. 相似文献
5.
Kathleen A Kapp-Simon Dennis E McGuire Beth C Long Dennis J Simon 《The Cleft palate-craniofacial journal》2005,42(1):45-50
OBJECTIVE: The purpose of this study was to determine whether social skills training can improve the social interaction skills of adolescents with craniofacial conditions (CFCs) in a natural environment (school lunchroom). DESIGN: This study used a pre-post between-group comparison design. Differences between treatment and control subjects were analyzed via a repeated measures analysis of variance. SETTING: The observations were conducted in the respective school lunch-rooms of the adolescents. Social skills groups were conducted in an outpatient clinic setting. MAIN OUTCOME MEASURES: Structured data based on 45 minutes of observation was coded for type, frequency, and duration of social contact. Specific measures included subject initiations and responses, peer initiations and responses, conversation events, total positive communication, and frequency of nondirected comments. RESULTS: Both target and peer-controlled total communication improved across time with adolescents receiving social skills intervention showing significantly more improvement than those adolescents not receiving direct social skills interventions. Adolescents receiving treatment participated in significantly more target initiated conversations lasting at least three interchanges and showed a trend toward a greater frequency of target initiations and positive responses to peer initiations. Peers were more likely to respond to treatment subject initiations after intervention. Fewer treatment subjects used nondirected communication, whereas control subjects continued to use nondirected communication at a slightly increased frequency. CONCLUSIONS: This study provides preliminary evidence that social skills training can increase the frequency of positive social interactions with peers for adolescents with CFCs. 相似文献
6.
7.
A Mycoplasma strain F38 growth-inhibiting monoclonal antibody (WM-25) identifies an epitope on a surface-exposed polysaccharide antigen. 总被引:1,自引:0,他引:1
下载免费PDF全文
![点击此处可从《Infection and immunity》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Monoclonal antibody (MAb) WM-25 differentiates by in vitro growth inhibition Mycoplasma capricolum subsp. capripneumoniae (Mycoplasma strain F38), which causes contagious carpine pleuropneumonia, from other Mycoplasma spp. (F. R. Rurangirwa, T. C. McGuire, A. J. Musoke, and A. Kibor, Infect. Immun. 55:3219-3220, 1987). The antigen identified by MAb WM-25 was isolated from solubilized Mycoplasma strain F38 organisms by MAb WM-25 affinity chromatography and was stained with Schiff's reagent, but not with Coomassie blue, after separation by sodium dodecyl sulfate-polyacrylamide gel electrophoresis. Treatment of purified F38 polysaccharide with periodate abolished binding with MAb WM-25, and MAb WM-25 binding was blocked with laminarin, a complex oligosaccharide with beta(1-->3) sugar linkages. Purified F38 polysaccharide blocked both growth inhibition and agglutination of live F38 organisms caused by MAb WM-25 and rabbit antiserum to F38 organisms. The results in this paper demonstrate that MAb WM-25 binds a periodate-sensitive epitope on the F38 polysaccharide which is also exposed on the surface of Mycoplasma strain F38. Because MAb WM-25 also causes in vitro growth inhibition of F38, the reactive polysaccharide epitope may induce protective immune responses. 相似文献
8.
9.
10.