全文获取类型
收费全文 | 815篇 |
免费 | 51篇 |
国内免费 | 23篇 |
专业分类
耳鼻咽喉 | 3篇 |
儿科学 | 36篇 |
妇产科学 | 21篇 |
基础医学 | 84篇 |
口腔科学 | 33篇 |
临床医学 | 85篇 |
内科学 | 174篇 |
皮肤病学 | 16篇 |
神经病学 | 16篇 |
特种医学 | 121篇 |
外科学 | 137篇 |
综合类 | 18篇 |
预防医学 | 41篇 |
眼科学 | 32篇 |
药学 | 33篇 |
中国医学 | 10篇 |
肿瘤学 | 29篇 |
出版年
2022年 | 10篇 |
2021年 | 14篇 |
2020年 | 12篇 |
2019年 | 15篇 |
2018年 | 20篇 |
2017年 | 12篇 |
2016年 | 17篇 |
2015年 | 21篇 |
2014年 | 25篇 |
2013年 | 24篇 |
2012年 | 27篇 |
2011年 | 46篇 |
2010年 | 33篇 |
2009年 | 48篇 |
2008年 | 40篇 |
2007年 | 42篇 |
2006年 | 24篇 |
2005年 | 14篇 |
2004年 | 20篇 |
2003年 | 11篇 |
2002年 | 16篇 |
2001年 | 10篇 |
2000年 | 6篇 |
1999年 | 18篇 |
1998年 | 33篇 |
1997年 | 42篇 |
1996年 | 32篇 |
1995年 | 24篇 |
1994年 | 21篇 |
1993年 | 18篇 |
1992年 | 6篇 |
1991年 | 13篇 |
1990年 | 17篇 |
1989年 | 21篇 |
1988年 | 16篇 |
1987年 | 12篇 |
1986年 | 13篇 |
1985年 | 17篇 |
1984年 | 9篇 |
1983年 | 10篇 |
1982年 | 6篇 |
1980年 | 11篇 |
1979年 | 2篇 |
1977年 | 7篇 |
1976年 | 7篇 |
1975年 | 8篇 |
1973年 | 3篇 |
1969年 | 2篇 |
1968年 | 2篇 |
1965年 | 2篇 |
排序方式: 共有889条查询结果,搜索用时 31 毫秒
1.
The human visual system is amenable to a number of adaptive processes; one such process, or collection of processes, is the adaptation to blur. Blur adaptation can be observed as an improvement in vision under degraded conditions, and these changes occur relatively rapidly following exposure to blur. The potential important future directions of this research area and the clinical implications of blur adaptation are discussed. 相似文献
2.
Toshiro Hara Rony Chanoch-Myers Nathan D. Mathewson Chad Myskiw Lyla Atta Lillian Bussema Stephen W. Eichhorn Alissa C. Greenwald Gabriela S. Kinker Christopher Rodman L. Nicolas Gonzalez Castro Hiroaki Wakimoto Orit Rozenblatt-Rosen Xiaowei Zhuang Jean Fan Tony Hunter Inder M. Verma Kai W. Wucherpfennig Itay Tirosh 《Cancer cell》2021,39(6):779-792.e11
- Download : Download high-res image (228KB)
- Download : Download full-size image
3.
4.
Fahim Zaman Atta Nawabi Kenneth D Abreo Gazi B Zibari 《JSLS, Journal of the Society of Laparoendoscopic Surgeons》2005,9(3):262-265
Laparoscopic procedures continue to gain popularity over traditional open procedures for a number of abdominal and pelvic surgeries. With increasing experience, the application of this technique is rising because it provides an alternative, less invasive, approach to various surgical procedures. Herein, we report our experience with adult patients with polycystic kidney disease, requiring bilateral laparoscopic nephrectomy before renal transplantation. 相似文献
5.
OBJECTIVE: To help the clinician bridge the gap between research and practice in determining ways to minimize side effects of endotracheal suctioning. DATA SOURCES: This article summarizes four previous reviews of research and studies published between 1984 and 1991 related to oxygenation techniques before, during and after endotracheal suctioning, and hemodynamic consequences of the suctioning procedure. STUDY SELECTION: Studies were reviewed by type of subject: animals, human subjects with normal lung function, and human subjects with abnormal lung function. Research of pediatric and head-injured populations was excluded from this review. DATA EXTRACTION: Oxygenation protocol, endotracheal suction characteristics, outcomes and measurement times, sample and setting, and findings were presented. CONCLUSIONS: Conclusions relate to the effectiveness of various endotracheal suction protocols on prevention of hypoxemia and hemodynamic compromise in intubated patients. DATA SYNTHESIS: An algorithm to guide clinical decision making is presented based on the conclusions of this review of the research. 相似文献
6.
7.
Hausegger KA; Cragg AH; Lammer J; Lafer M; Fluckiger F; Klein GE; Sternthal MH; Pilger E 《Radiology》1994,190(1):199
8.
Serum ionic fluoride levels in haemodialysis and continuous ambulatory peritoneal dialysis patients 总被引:1,自引:1,他引:0
al-Wakeel JS; Mitwalli AH; Huraib S; al-Mohaya S; Abu-Aisha H; Chaudhary AR; al-Majed SA; Memon N 《Nephrology, dialysis, transplantation》1997,12(7):1420-1424
High serum fluoride (F-) in patients with chronic renal failure (CRF) and
end-stage renal disease (ESRD) is associated with risk of renal
osteodystrophy and other bone changes. This study was done to determine F-
in normal healthy controls and patients with ESRD on haemodialysis (HD) or
peritoneal dialysis (PD). Seventeen healthy controls (12 males, 5 females)
and 39 ESRD patients on dialysis (17 males, 22 females) were recruited in
the study in a community with 47.4 +/- 3.28 microM/l (range 44-51 microM/l)
of F- content in drinking water. Control subjects showed a mean serum F-
concentration of 1.08 +/- 0.350 microM/l. Males in control group showed
slightly higher F- levels (1.15 +/- 0.334, range 0.55-1.9 microM/l) than
females (0.92 +/- 0.370, range 0.6-1.5 microM/l). Mean serum F-
concentration did not correlate significantly with age and sex among
control subjects, whereas such correlation was observed in patients with
ESRD on dialysis. Mean serum F- concentration was significantly higher in
patients on dialysis (2.67 +/- 1.09, range 0.8-5.2 microM/l) than normal
controls. When grouped according to sex, the mean serum F- concentration in
males (3.05 +/- 1.04, range 1.8-5.2 microM/l) was significantly higher than
females (2.38 +/- 1.08, range 0.8-5.2 microM/l). When patients were grouped
according to age, it was observed that F- concentration was significantly
higher in patients with age groups 21-70 (2.86 +/- 1.05) than those with
age group 13-20 years (1.42 +/- 0.531). Thus F- concentration correlated
with age and sex, being higher in males and above 20 years. Despite
appreciable clearance of F- (39-90%) across the peritoneum, patients on
CAPD showed higher serum F- concentration than those on HD (3.1 +/- 1.97 vs
2.5 +/- 1.137 microM/l). Of the total 39 patients on dialysis 39% had their
serum F- concentration above 3.0 microM/l, posing the risk of renal
osteodystrophy.
相似文献
9.
Focal liver lesions: characterization with triphasic spiral CT 总被引:15,自引:1,他引:14
10.
Metabolic adaptation of the chick embryo to chronic hypoxia 总被引:1,自引:0,他引:1