全文获取类型
收费全文 | 2376篇 |
免费 | 129篇 |
国内免费 | 4篇 |
专业分类
耳鼻咽喉 | 29篇 |
儿科学 | 234篇 |
妇产科学 | 20篇 |
基础医学 | 213篇 |
口腔科学 | 74篇 |
临床医学 | 136篇 |
内科学 | 406篇 |
皮肤病学 | 64篇 |
神经病学 | 145篇 |
特种医学 | 116篇 |
外科学 | 305篇 |
综合类 | 315篇 |
预防医学 | 76篇 |
眼科学 | 33篇 |
药学 | 192篇 |
1篇 | |
中国医学 | 11篇 |
肿瘤学 | 139篇 |
出版年
2022年 | 17篇 |
2021年 | 51篇 |
2020年 | 28篇 |
2019年 | 29篇 |
2018年 | 51篇 |
2017年 | 28篇 |
2016年 | 42篇 |
2015年 | 62篇 |
2014年 | 83篇 |
2013年 | 90篇 |
2012年 | 119篇 |
2011年 | 142篇 |
2010年 | 121篇 |
2009年 | 85篇 |
2008年 | 97篇 |
2007年 | 113篇 |
2006年 | 110篇 |
2005年 | 85篇 |
2004年 | 108篇 |
2003年 | 76篇 |
2002年 | 59篇 |
2001年 | 64篇 |
2000年 | 72篇 |
1999年 | 60篇 |
1998年 | 46篇 |
1997年 | 40篇 |
1996年 | 36篇 |
1995年 | 22篇 |
1994年 | 33篇 |
1993年 | 17篇 |
1992年 | 47篇 |
1991年 | 51篇 |
1990年 | 33篇 |
1989年 | 36篇 |
1988年 | 39篇 |
1987年 | 26篇 |
1986年 | 21篇 |
1985年 | 25篇 |
1984年 | 17篇 |
1983年 | 20篇 |
1982年 | 16篇 |
1981年 | 10篇 |
1977年 | 10篇 |
1976年 | 16篇 |
1974年 | 17篇 |
1973年 | 21篇 |
1972年 | 11篇 |
1971年 | 10篇 |
1970年 | 10篇 |
1968年 | 9篇 |
排序方式: 共有2509条查询结果,搜索用时 312 毫秒
11.
12.
13.
A case of fat embolism syndrome is reported following an uncomplicated bone marrow harvest. The presenting symptoms were restlessness, shortness of breath and arterial hypoxemia. A lung perfusion scan ruled out the presence of a lung thromboembolism. The patient received supportive therapy and recovered within a few hours. We speculate that the larger gauge needle (13 vs 15) used to aspirate the bone marrow may have represented increased trauma to the iliac crest leading to fat embolism. 相似文献
14.
P. Arora V. Kher P. K. Rai M. K. Singhal S. Gulati A. Gupta 《Pediatric nephrology (Berlin, Germany)》1997,11(2):153-155
Various factors were analyzed in 80 consecutive children under 16 years who had acute renal failure (ARF), for various prognostic
factors. Overall mortality was 42.5%, with significantly higher levels seen in hemolytic uremic syndrome (68%, P <0.05) and associated with cardiac surgery (90.9%, P <0.01). Anuria (67.6% vs. 43.5%, P <0.05), need for dialysis (85.3% vs. 56.5%, P <0.05), neurological complications (50% vs. 6.3%, P <0.01), and respiratory complications (35.2% vs. 2.1%, P <0.01) were significantly higher in nonsurvivors than survivors. Multiple regression analysis showed the presence of neurological
and respiratory complications to be poor prognostic factors.
Received May 2, 1995; received in revised form August 28, 1996; accepted September 13, 1996 相似文献
15.
16.
17.
The effect of melanotropin release inhibiting factor (Pro-Leu-Gly-NH2, MIF) was determined on changes induced by two neuroleptics, haloperidol and centbutindole, in cerebral cortical 5-hydroxytryptamine (5-HT) receptors. Male Sprague-Dawley rats were injected daily i.p. with vehicle, haloperidol (1.0 mg/kg) or centbutindole (0.5 mg/kg), respectively, for 21 days. On day 22, these 3 groups were further divided into 2 subgroups and injected with either vehicle or MIF (2.0 mg/kg, i.p.) daily for 3 days. 3H-5-HT was used to study 5-HT1 receptors, and 3H-spiroperidol to label 5-HT2 receptors in the cerebral cortex. Chronic administration of haloperidol significantly increased (39.7%) the maximal binding capacity (Bmax) of 3H-5-HT binding to 5-HT1 receptors. Dissociation constant (Kd) values did not change. Centbutindole had no effect on 5-HT1 receptors. MIF had no effect on 5-HT1 receptors, nor did it alter haloperidol-induced increases in the Bmax of 3H-5-HT binding to 5-HT1 receptors. Chronic administration of centbutindole significantly increased (61.1%) the Bmax of 3H-spiroperidol binding to 5-HT2 receptors. No change occurred in the Kd values. Chronic treatment with haloperidol had no effect on 5-HT2 receptor characteristics. MIF had no effect on 5-HT2 receptors or on the increase in 5-HT2 receptor density induced by centbutindole. The behavioral syndrome induced by 5-hydroxytryptophan (5-HTP) (50, 100 and 200 mg/kg, i.p.) was also measured in rats treated chronically with haloperidol or centbutindole. Haloperidol had no effect on the 5-HTP syndrome, whereas centbutindole stimulated by 24-45% the intensity of the syndrome.(ABSTRACT TRUNCATED AT 250 WORDS) 相似文献
18.
19.
Lipoprotein (a) (Lp(a)) and other lipid values have been correlated with angiographically defined [table: see text] coronary artery disease. To study this relationship in Indian patients, plasma levels of Lipoprotein (a) and other lipids were assessed in 74 patients undergoing Coronary arteriography and also in 53 age and sex matched healthy male blood bank donors who served as controls. Total cholesterol (mg/dl) (211 +/- 56 vs 186 +/- 43; p < 0.001), low density lipoprotein Cholesterol (mg/dl) (117 +/- 40 vs 88 +/- 29; p > 0.001) and low density lipoprotein/high density lipoprotein cholesterol ratio (2.6 +/- 0.8 vs 2.2 +/- 0.9; p < .001) were significantly higher in patients than controls. High density lipoprotein-cholesterol (mg/dl) (43.5 +/- 6 vs 42.1 +/- 7; p-ns) very low density lipoprotein-cholesterol (mg/dl) (49.7 +/- 17 vs 56.1 +/- 25; p-ns) and triglycerides (mg/dl) (155 +/- 101 vs 167 +/- 88; p-ns) were not statistically different in two groups. Lipoprotein (a) levels showed highly skewed distribution. Patients (n = 74) showed almost five fold higher lipoprotein (a) levels (mg/dl) as compared to controls (n = 53) [105 +/- 565 vs 23 +/- 76]. Patients with very high lipoprotein (a) levels [values of more than 40 mg/dl] (n = 18) had high density lipoprotein cholesterol and total cholesterol significantly lower than rest of the patient group. [high density lipoprotein cholesterol (mg/dl) 41.00 +/- 3.7 vs 44 +/- 6.4; p < 0.01 and total cholesterol (mg/dl) 192 +/- 34 vs 217 +/- 53; p < 0.05]. 相似文献
20.
AgNORs in endometrial lesions 总被引:1,自引:0,他引:1
Kaushik R Sharma S Mahajan V Gulati A Sharma BB 《Indian journal of pathology & microbiology》1999,42(4):451-454
Silver nucleolar organizer region (AgNOR) staining was employed in one hundred specimens of endometrium. These included fifteen normal controls (Proliferative + Secretory endometrium) and eighty five lesions. Endometrial lesions comprised of endometritis (15), endometrial hyperplasia (25) and endometrial carcinoma (45). Three micron thick sections of paraffin embedded tissue were subjected to AgNOR staining as described by Crocker and Smith with a little modification of 0.01% safranin counterstain--The mean AgNOR scores were found to increase steadily from normal to endometritis to endometrial hyperplasia and carcinoma--The observations revealed statistically significant differences in values between atypical hyperplasia and carcinoma also. AgNOR staining and scoring is simple, inexpensive and a useful adjunct to routine histopathology to evaluate endometrial lesions especially to differentiate borderline lesions. Though scores cannot be standardized and fixed for a particular lesion as there are intralaboratory variations. 相似文献