全文获取类型
收费全文 | 1941篇 |
免费 | 84篇 |
国内免费 | 152篇 |
专业分类
耳鼻咽喉 | 2篇 |
儿科学 | 77篇 |
妇产科学 | 36篇 |
基础医学 | 130篇 |
口腔科学 | 33篇 |
临床医学 | 244篇 |
内科学 | 501篇 |
皮肤病学 | 37篇 |
神经病学 | 79篇 |
特种医学 | 323篇 |
外科学 | 281篇 |
综合类 | 43篇 |
一般理论 | 1篇 |
预防医学 | 90篇 |
眼科学 | 19篇 |
药学 | 154篇 |
1篇 | |
肿瘤学 | 126篇 |
出版年
2022年 | 7篇 |
2021年 | 21篇 |
2020年 | 13篇 |
2019年 | 18篇 |
2018年 | 26篇 |
2017年 | 15篇 |
2016年 | 18篇 |
2015年 | 21篇 |
2014年 | 45篇 |
2013年 | 53篇 |
2012年 | 61篇 |
2011年 | 74篇 |
2010年 | 59篇 |
2009年 | 69篇 |
2008年 | 67篇 |
2007年 | 152篇 |
2006年 | 62篇 |
2005年 | 79篇 |
2004年 | 43篇 |
2003年 | 33篇 |
2002年 | 52篇 |
2001年 | 46篇 |
2000年 | 43篇 |
1999年 | 34篇 |
1998年 | 83篇 |
1997年 | 85篇 |
1996年 | 85篇 |
1995年 | 82篇 |
1994年 | 69篇 |
1993年 | 67篇 |
1992年 | 45篇 |
1991年 | 32篇 |
1990年 | 25篇 |
1989年 | 68篇 |
1988年 | 40篇 |
1987年 | 43篇 |
1986年 | 35篇 |
1985年 | 32篇 |
1984年 | 27篇 |
1983年 | 21篇 |
1982年 | 34篇 |
1981年 | 16篇 |
1980年 | 22篇 |
1979年 | 21篇 |
1978年 | 11篇 |
1977年 | 25篇 |
1976年 | 32篇 |
1975年 | 16篇 |
1973年 | 5篇 |
1970年 | 6篇 |
排序方式: 共有2177条查询结果,搜索用时 0 毫秒
1.
Thomas Donohue Morton J. Kern Richard Bach Frank Aguirre Thomas Wolford 《Catheterization and cardiovascular interventions》1993,28(2):155-161
The vasomotor response of native human collateral vessels to pharmacologic or hemodynamic vasodilatory stimuli is not well known. We describe a case where retrograde collateral flow velocity was measured both at baseline and following selected hemodynamic and pharmacologic interventions. This index case represents the first in a series of potential human physiologic studies designed to address questions pertaining to control of collateral blood supply in humans. © 1993 Wiley-Liss, Inc. 相似文献
2.
3.
4.
A crescentic osteotomy of the first metatarsal is unstable during the preliminary healing stage. The authors present a modification in the direction of the cut of the osteotomy. This alteration increases stability at the first metatarsal base. 相似文献
5.
W. de Riese E. B. Walker C. de Riese T. M. Ulbright W. N. Crabtree J. Messemer J. A. Jones A. Hinkel R. S. Foster J. P. Donohue T. Senge 《Urological research》1994,22(4):213-220
Current clinical staging, which includes the use of serum tumor markers and imaging techniques, fails to identify the 30–40% of clinical stage I (CS I) nonseminomatous germ cell testicular tumor (NSGCT) patients who have occult metastatic disease. Therefore, there is a real clinical need to evaluate new biological parameters of the primary tumor that might be useful as predictors of occult metastatic disease. This study was undertaken to compare quantitative DNA measurements by flow cytometry and image analysis in CS I NSGCT, and to analyze the relevance of these parameters for predicting occult lymph node involvement. Different blocks of formalin-fixed, paraffin-embedded NSGCTs of 62 CS I patients who underwent retroperitoneal lymph node dissection between 1985 and 1989 were prepared according to the Hedley technique, and analyzed by quantitative cytometry. Thirty-six (58.1%) patients had histologically proven lymph node involvement (pathological stage II), whereas 26 (41.9%) patients (pathological stage I) had neither lymph node metastases according to retroperitoneal lymph node dissection (RPLND) specimens nor tumor recurrence during follow-up. Concordant results were found in 76.5% of the samples by both cytometric techniques. For flow cytometry, the percentages of aneuploid cells in the S- and the G2M+S-phase were the most robust predictive parameters for lymph node involvement, whereas for image analysis the 5c exceeding rate (5cER) had the most predictive significance. Based on the experience obtained in this study, both cytometric techniques provide additional information on tumor aggressiveness that might be useful in therapeutic selection of early stage NSGCT patients for either RPLND or surveillance only. 相似文献
6.
April R. Bradley Elizabeth A. Yeater William O’Donohue 《The journal of primary prevention》2009,30(6):697-715
This study evaluated the short-term effectiveness of a mixed-gender sexual assault prevention program developed for college
students. Program participants (n = 177) were compared to non-program participants (n = 132) prior to the program and during a 2-week follow-up period on measures of rape myths, victim empathy, perceived negative
consequences and estimated likelihood of committing rape, sexual communication, sexual assault awareness, and risky dating
behavior. The prevention program was effective at increasing men’s victim empathy and decreasing their adherence to rape myths
but ineffective at changing women’s assault-related knowledge, participation in risky dating behaviors, and sexual communication
strategies. Limitations of the study and directions for future research in sexual assault prevention are addressed. Editors’ Strategic Implications: This study provides an important example of the limitations of a single session prevention programming approach (even if
it is well designed and executed) in addressing a systemic and pervasive problem like sexual assault on college campuses. 相似文献
7.
Intestinal schistosomiasis japonica: CT-pathologic correlation 总被引:1,自引:0,他引:1
Lee RC; Chiang JH; Chou YH; Rubesin SE; Wu HP; Jeng WC; Hsu CC; Tiu CM; Chang T 《Radiology》1994,193(2):539
8.
9.
10.
The patellofemoral joint was imaged with magnetic resonance (MR) in the axial plane while the knee was positioned from 0 degrees to 32 degrees of flexion (nine positions). These multiple sequential images obtained within the early phases of flexion of the knee were viewed in a "cine-loop" format, producing a kinematic study that clearly demonstrated the relationship of the patella to the trochlear groove. Four healthy subjects and one patient with known bilateral subluxing patellae were studied. The preliminary results suggest that kinematic MR imaging of the patellofemoral joint is potentially useful for the evaluation of patellar tracking abnormalities. 相似文献