全文获取类型
收费全文 | 1613篇 |
免费 | 152篇 |
国内免费 | 9篇 |
专业分类
耳鼻咽喉 | 9篇 |
儿科学 | 50篇 |
妇产科学 | 22篇 |
基础医学 | 190篇 |
口腔科学 | 45篇 |
临床医学 | 214篇 |
内科学 | 363篇 |
皮肤病学 | 33篇 |
神经病学 | 151篇 |
特种医学 | 109篇 |
外科学 | 192篇 |
综合类 | 85篇 |
预防医学 | 136篇 |
眼科学 | 11篇 |
药学 | 97篇 |
中国医学 | 4篇 |
肿瘤学 | 63篇 |
出版年
2021年 | 24篇 |
2020年 | 12篇 |
2019年 | 14篇 |
2018年 | 16篇 |
2017年 | 15篇 |
2016年 | 22篇 |
2015年 | 30篇 |
2014年 | 33篇 |
2013年 | 71篇 |
2012年 | 58篇 |
2011年 | 64篇 |
2010年 | 49篇 |
2009年 | 57篇 |
2008年 | 72篇 |
2007年 | 70篇 |
2006年 | 70篇 |
2005年 | 77篇 |
2004年 | 69篇 |
2003年 | 51篇 |
2002年 | 46篇 |
2001年 | 54篇 |
2000年 | 45篇 |
1999年 | 50篇 |
1998年 | 53篇 |
1997年 | 36篇 |
1996年 | 34篇 |
1995年 | 31篇 |
1994年 | 31篇 |
1993年 | 28篇 |
1992年 | 24篇 |
1991年 | 28篇 |
1990年 | 20篇 |
1989年 | 35篇 |
1988年 | 40篇 |
1987年 | 29篇 |
1986年 | 38篇 |
1985年 | 23篇 |
1984年 | 21篇 |
1983年 | 14篇 |
1982年 | 11篇 |
1981年 | 21篇 |
1980年 | 21篇 |
1979年 | 9篇 |
1978年 | 17篇 |
1977年 | 11篇 |
1976年 | 22篇 |
1975年 | 10篇 |
1974年 | 11篇 |
1973年 | 13篇 |
1970年 | 16篇 |
排序方式: 共有1774条查询结果,搜索用时 15 毫秒
1.
BARI NUHOLU ALI AYYILDIZ VECIHI FIDAN ÖZDEN CEBECI UUR KOAR CANKON GERMIYANOLU 《International journal of urology》2006,13(2):109-110
OBJECTIVE: Nocturnal enuresis is a common pediatric problem, the etiology of which is unclear. In recent years, various studies have been published stating that children with nocturnal enuresis exhibit growth and skeletal maturation retardation. METHODS: In this cross-sectional study, we included 27 patients (16 boys, 11 girls) between the ages of 6 and 14 years who had presented with primary nocturnal enuresis (PNE) complaints. We included in the evaluation 19 healthy subjects (12 boys, 7 girls), who were the siblings of the children with PNE, as the control group. RESULTS: The patients in both groups were similar in chronological age, bone age, height and weight, with no significant difference between groups (P>0.05). CONCLUSION: The two groups in our study consisted of the same genetic background. Thus, our results were found to be different from the previous studies. We have concluded that there is no direct relationship between enuresis nocturnal and skeletal maturation. 相似文献
2.
3.
The epidemiologic necropsy for abdominal aortic aneurysm 总被引:1,自引:0,他引:1
M J McFarlane 《JAMA》1991,265(16):2085-2088
The epidemiologic necropsy measures the occurrence of unsuspected disease through the examination of necropsy records. The estimates of unsuspected disease should approximate what occurs in the living population. The necropsy records of the University of Kansas Medical Center (Kansas City) from 1950 to 1984 were examined for the occurrence rate of abdominal aortic aneurysms. Each adult patient was categorized as (1) without abdominal aortic aneurysm, (2) abdominal aortic aneurysm discovered as a necropsy surprise, or (3) abdominal aortic aneurysm diagnosed or suspected during life. Necropsy detection rates of unsuspected abdominal aortic aneurysms were compared with those found in five published screening surveys. The necropsy detection rate in men was 81 (0.019) of 4155 and was 28 (0.009) of 3142 in women, a difference that was statistically significant. When the necropsy series was adjusted to reflect the same demographic composition as the screening surveys, the results from necropsy and screening were statistically similar. In particular, two surveys from the United Kingdom showed screening detection rates among white men of 0.072 compared with a necropsy detection rate of 0.058. These results further support the use of the epidemiologic necropsy as a research tool for estimating the reservoir of disease in the population. 相似文献
4.
5.
6.
Isoflurane for removal of chest drains after cardiac surgery 总被引:2,自引:0,他引:2
Thirty-five patients who had undergone uncomplicated cardiac surgery were randomly allocated to receive either Entonox or isoflurane 0.25% in Entonox as inhalational analgesia for the removal of their two chest drains. The gases were presented premixed in high-pressure cylinders and were self-administered by means of a demand valve. The removal of the second drain was more painful than the first but that pain was better controlled by isoflurane 0.25% in Entonox than by Entonox alone. 相似文献
7.
The relationship between internal jugular vein diameter as measured with an ultrasound imaging machine (SiteRite, Dymax) and external jugular vein diameter was studied in 50 anaesthetised patients undergoing elective cardiac surgery. There was an inverse correlation between external jugular vein diameter and internal jugular vein diameter ( r = −0.47, p < 0.001). All patients with an external jugular vein diameter of 7 mm or greater had an internal jugular vein diameter of less than 15 mm. No patient with an external jugular vein diameter of less than 7 mm had an internal jugular vein diameter of less than 20 mm. No other patient dimension (height, weight, body mass index, neck circumference) predicted internal jugular vein size. These results suggest that a large external jugular vein (i.e. 7 mm or greater in external diameter) may be associated with a small internal jugular vein. A size 5.0-mm internal diameter tracheal tube may be used to provide a rapid assessment of external jugular vein diameter. 相似文献
8.
We interviewed 290 pregnant women randomly selected from public and private prenatal clinics, 80 per cent of whom were at least five months pregnant (ages 18-43, 42 per cent Latino, 22 per cent Black). Twenty-four women reported physical battering during this pregnancy (44 reported physical battering before the current pregnancy). Eight of the 24 pregnant women had sought medical treatment for injuries sustained; none reported having been assessed by prenatal care providers for abuse. 相似文献
9.
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
10.
E. M. Wintour M. Lewitt A. McFarlane K. Moritz S. Potocnik S. Rees K. Tangalakis 《Acta neuropathologica》1996,91(5):537-544
Hydranencephaly is defined as the replacement of a previously normal brain, in whole or in part, by membranous fluid-filled
sacs. The etiology is not well understood, and the time course of development is unknown. Fifteen ovine fetuses were chronically
cannulated and had both carotid arteries ligated at 100 days of gestation (term is 145–150 days). They were killed at 1 (n = 4), 2 (n = 6) and 4 (n = 5) weeks post-surgery, and the findings compared with those of 25 age-matched controls. By 2 weeks post-surgery the entire
cerebral hemispheres and diencephalon had been replaced by fluid closely resembling cerebrospinal fluid. The choroid plexus,
pituitary and brain stem remained outwardly normal, but the cerebellum showed signs of damage. Fetuses maintained normal values
for blood gases and hematocrit up to 4 weeks post-surgery, and grew normally. Light microscopy of the brain stem showed significant
losses of cell populations in the medulla by 4 weeks. Vascular casting and acute blood flow studies in an additional group
of fetuses showed that the entire brain was perfused via the vertebral-occipital anastomosis immediately after acute bilateral
carotid clamping, but that the blood flow rate was insufficient to maintain adequate oxygen delivery.
Received: 4 August 1995 / Revised, accepted: 30 November 1995 相似文献