全文获取类型
收费全文 | 3059篇 |
免费 | 207篇 |
国内免费 | 29篇 |
专业分类
耳鼻咽喉 | 32篇 |
儿科学 | 196篇 |
妇产科学 | 49篇 |
基础医学 | 334篇 |
口腔科学 | 66篇 |
临床医学 | 260篇 |
内科学 | 503篇 |
皮肤病学 | 56篇 |
神经病学 | 295篇 |
特种医学 | 257篇 |
外科学 | 402篇 |
综合类 | 118篇 |
一般理论 | 3篇 |
预防医学 | 207篇 |
眼科学 | 72篇 |
药学 | 204篇 |
中国医学 | 6篇 |
肿瘤学 | 235篇 |
出版年
2023年 | 28篇 |
2022年 | 52篇 |
2021年 | 93篇 |
2020年 | 44篇 |
2019年 | 75篇 |
2018年 | 104篇 |
2017年 | 71篇 |
2016年 | 91篇 |
2015年 | 93篇 |
2014年 | 136篇 |
2013年 | 142篇 |
2012年 | 180篇 |
2011年 | 201篇 |
2010年 | 137篇 |
2009年 | 117篇 |
2008年 | 179篇 |
2007年 | 185篇 |
2006年 | 129篇 |
2005年 | 148篇 |
2004年 | 130篇 |
2003年 | 106篇 |
2002年 | 85篇 |
2001年 | 62篇 |
2000年 | 63篇 |
1999年 | 56篇 |
1998年 | 48篇 |
1997年 | 55篇 |
1996年 | 43篇 |
1995年 | 31篇 |
1994年 | 22篇 |
1993年 | 27篇 |
1992年 | 19篇 |
1991年 | 34篇 |
1990年 | 36篇 |
1989年 | 41篇 |
1988年 | 28篇 |
1987年 | 27篇 |
1986年 | 28篇 |
1985年 | 19篇 |
1984年 | 15篇 |
1983年 | 17篇 |
1982年 | 10篇 |
1981年 | 8篇 |
1980年 | 17篇 |
1979年 | 5篇 |
1978年 | 6篇 |
1977年 | 9篇 |
1976年 | 10篇 |
1975年 | 8篇 |
1967年 | 4篇 |
排序方式: 共有3295条查询结果,搜索用时 15 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.
Sarala Rajajee Malathi Sathyasekaran Janani Shankar Latha Dhathathri Anandnathan 《Indian journal of pediatrics》2002,69(10):821-822
A 5-year-old boy presented with history of failure to thrive from infancy. There was a history of one sibling death due to
similar problems and history of severe abortions in the mother. Routine examination of peripheral smear revealed more than
50% acanthocytes. Based on this tests were streamlined to doing lipid profile and Lipo protein electrophoresis which revealed
hypolipidemia and absent Β hypo protein band. Jejuna) mucosal biopsy confirmed the diagnosis of A Beta Lipo proteinemia which
revealed lipid laden enterocytes. This case illustrates the importance of simple tests like peripheral smear examination in
streamlining further tests in the diagnosis of major diseases. 相似文献
3.
We studied the relationship between arterial carbon dioxide tension (PaCO2) and fresh gas flow (FGF) during use of the Bain breathing circuit for Caesarean section anaesthesia. Thirty-one patients undergoing Caesarean section were anaesthetised using the Bain circuit with intermittent positive pressure ventilation. The PaCO2 were measured at FGF of 70 ml X kg-1 X min-1, 80 ml X kg-1 X min-1, and 100 ml X kg-1 X min-1. The FGF requirement to maintain a given PaCO2 during Caesarean section anaesthesia is the same as the requirements for nonpregnant subjects, despite the increase in carbon dioxide production associated with pregnancy. This is probably because the total FGF determined by body weight and given during Caesarean section anaesthesia is 15-20 per cent higher than nonpregnant levels, due to the weight gain associated with pregnancy. A FGF of 100 ml X kg-1 of pregnant weight/min maintains PaCO2 of 4.44 kPa predelivery, which is in the desirable range of PaCO2 during Caesarean section. 相似文献
4.
5.
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.
10.
Focal liver lesions: characterization with triphasic spiral CT 总被引:15,自引:1,他引:14