全文获取类型
收费全文 | 555篇 |
免费 | 19篇 |
国内免费 | 13篇 |
专业分类
耳鼻咽喉 | 19篇 |
儿科学 | 19篇 |
妇产科学 | 23篇 |
基础医学 | 31篇 |
口腔科学 | 6篇 |
临床医学 | 83篇 |
内科学 | 81篇 |
皮肤病学 | 13篇 |
神经病学 | 21篇 |
特种医学 | 82篇 |
外科学 | 101篇 |
综合类 | 16篇 |
预防医学 | 10篇 |
眼科学 | 13篇 |
药学 | 56篇 |
中国医学 | 2篇 |
肿瘤学 | 11篇 |
出版年
2023年 | 5篇 |
2022年 | 3篇 |
2021年 | 7篇 |
2020年 | 4篇 |
2019年 | 14篇 |
2018年 | 16篇 |
2017年 | 10篇 |
2016年 | 15篇 |
2015年 | 13篇 |
2014年 | 20篇 |
2013年 | 25篇 |
2012年 | 28篇 |
2011年 | 37篇 |
2010年 | 20篇 |
2009年 | 16篇 |
2008年 | 17篇 |
2007年 | 35篇 |
2006年 | 44篇 |
2005年 | 47篇 |
2004年 | 29篇 |
2003年 | 30篇 |
2002年 | 24篇 |
2001年 | 26篇 |
2000年 | 15篇 |
1999年 | 7篇 |
1998年 | 11篇 |
1997年 | 8篇 |
1996年 | 3篇 |
1995年 | 8篇 |
1994年 | 5篇 |
1993年 | 3篇 |
1992年 | 3篇 |
1991年 | 2篇 |
1990年 | 6篇 |
1989年 | 4篇 |
1988年 | 3篇 |
1986年 | 2篇 |
1985年 | 5篇 |
1984年 | 2篇 |
1983年 | 1篇 |
1982年 | 6篇 |
1981年 | 3篇 |
1980年 | 3篇 |
1976年 | 1篇 |
1975年 | 1篇 |
排序方式: 共有587条查询结果,搜索用时 0 毫秒
1.
2.
3.
4.
Akman MA Erden HF Tosun SB Bayazit N Aksoy E Bahceci M 《Human reproduction (Oxford, England)》2001,16(5):868-870
The management of poor responders in IVF has always been a big problem. The ideal approach has yet to be formulated. In this study we aim to compare two alternative stimulation protocols. A total of 48 poor responder patients described from previous cycles were included and grouped into two: group I consisted of 24 patients in 24 cycles in which leuprolide acetate (40 microg s.c. per day) was initiated on cycle day 2 followed by exogenous gonadotrophins on cycle day 3; group II consisted of 24 patients in 24 cycles in which ovarian stimulation included gonadotrophin-releasing hormone (GnRH) antagonist (cetrorelix, 0.25 mg daily during late follicular phase) administration. While only the oestradiol concentrations on the day of HCG were lower in group II compared with group I, the clinical pregnancy and implantation rates among groups did not show any significance. The impact of these two regimens in ovarian stimulation of poor responders seem to be same and to establish these results further randomized studies with larger sample sizes are required. 相似文献
5.
Dextromethorphan attenuates ethanol withdrawal syndrome in rats 总被引:9,自引:0,他引:9
Erden BF Ozdemirci S Yildiran G Utkan T Gacar N Ulak G 《Pharmacology, biochemistry, and behavior》1999,62(3):537-541
The effects of dextromethorphan (DM), a noncompetitive antagonist of the N-methyl-D-aspartate (NMDA) receptors, have been investigated on ethanol withdrawal signs in rats. Ethanol (7.2% v/v) was given to rats in a liquid diet for 16 days. DM (10, 20, and 40 mg/kg) and saline were injected intraperitoneally at the third hour of ethanol withdrawal. DM (40 mg/kg) and ethanol dependent saline were also administered to ethanol naive rats. DM (40 mg/kg) did not produce any significant change in locomotor activity in ethanol naive rats. The effects of DM on locomotor activity and total ethanol withdrawal score were evaluated at the fourth and sixth hours of ethanol withdrawal. DM inhibited locomotor hyperactivity at these periods. DM also reduced total ethanol withdrawal score from the fourth hour to the sixth hour, and it significantly decreased audiogenic seizures. Seizure susceptibility after chronic ethanol exposure may be dependent upon sensitization or upregulation of NMDA processes and NMDA receptors. Our results suggest that inhibition of NMDA receptors by DM alleviates signs of ethanol withdrawal. 相似文献
6.
Aye Erden Ethem Geim Suat Fitoz Atilla H Elhan .llhan Erden Selma Tükel 《Journal of Medical Imaging and Radiation Oncology》2003,47(4):375-380
We aimed to determine the diagnostic performance of the contrast‐enhanced fat‐suppression technique in the detectability of perianal infections and to compare this technique with different MR sequences used for this purpose. Thirty consecutive patients with clinically suspected anorectal infections were examined with fast spin‐echo (FSE) T2‐weighted, short‐inversion‐time inversion recovery (STIR), and fat‐suppressed and non‐fat‐suppressed T1‐weighted spoiled gradient‐echo (SGE) (in‐phase) dynamic contrast‐enhanced sequences. The results of MRI were correlated with the findings of surgery, which was considered as the standard of reference. Receiver‐operating‐characteristic curves were reconstructed to describe and compare the diagnostic value of each MR technique. The values of kappa were used as a measure of observer reliability. Diagnostic performances of STIR, FSE T2‐weighted and fat‐suppressed and non‐fat‐suppressed, contrast‐enhanced SGE T1‐weighted techniques showed statistically insignificant differences in detection of perianal infections. There was almost perfect interobserver agreement regarding the presence of lesions on each MR technique. Fat‐suppressed, contrast‐enhanced SGE T1‐weighted MRI showed adequate diagnostic performance in the detection of perianal infections. However, its significance is not different from the other MR sequences used for the present study. 相似文献
7.
8.
Acute myocardial infarction (AMI) is a rare, but possibly catastrophic event during pregnancy, delivery, or puerperium, leading to a high mortality rate. It has different pathogenic mechanisms, such as atherosclerosis, vasospasm, thrombosis, and coronary dissection. Although MI has been reported in pregnant women at all stages of pregnancy and postpartum, it occurs more commonly in the third trimester. Pregnancy-associated MI most commonly involves the anterior wall. Pregnancy itself is an independent risk factor for MI, conferring a fourfold higher risk than that of nonpregnant women matched for age. We report the case of a 27-year-old primigravida at 30 weeks’ gestation presenting with anterior MI, secondary to severe stenosis of the left anterior descending coronary artery, treated with emergency percutaneous coronary intervention. 相似文献
9.
H. Ucak D. Cicek B. Demir I. Erden S. Ozturk 《Journal of the European Academy of Dermatology and Venereology》2014,28(1):34-40
Background Alopecia areata (AA) is an organ‐specific, T‐cell‐mediated autoimmune disease that is characterized by non‐scarring hair loss. Objective We aimed to find the factors that may affect the response to topical therapy in AA. Methods The study included a total of 60 patients with AA and 30 healthy control patients. The AA patients were randomized into two groups. 40 patients used 0.05% clobetasol propionate cream, and 20 patients used petrolatum (placebo). Both groups applied topical treatments to their lesions twice daily for 12 weeks. Results The mean extent of AA was 21.88 ± 16.75% in patients with autoantibodies and 12.16 ± 13.55% in those who were negative for autoantibodies (P = 0.021). Ophiasic pattern and nail involvement were observed more frequently in patients with atopy (P < 0.05). Relapse was more frequent in patients with atopy (P = 0.002) and nail involvement (P = 0.02). Conclusions We observed that the presence of autoantibodies was associated with more extensive AA, and that ophiasic hair loss pattern and nail dystrophy were significantly associated with atopy. Topical clobetasol propionate treatment produced a modest advantage in hair regrowth as compared with placebo. Notably, atopic AA patients have a higher risk of relapse and redevelopment of AA after completing a course of topical corticosteroid treatment. 相似文献
10.
Yurdaydin C Bozkaya H Onder FO Sentürk H Karaaslan H Akdoğan M Cetinkaya H Erden E Erkan-Esin O Yalçin K Bozdayi AM Schinazi RF Gerin JL Uzunalimoğlu O Ozden A 《Journal of viral hepatitis》2008,15(4):314-321
Summary. Chronic delta hepatitis is the most severe form of chronic viral hepatitis for which interferon (IFN) is the only available treatment. In 39 patients (25 were treatment-naïve, 14 had previously used IFN), efficacy of 1-year treatment with IFN (9 MU, t.i.w.) or lamivudine (LAM; 100 mg, q.d.) alone was compared with IFN and LAM combination (2 months of LAM to be followed by combination treatment). IFN monotherapy was given only to treatment-naïve patients. In both treatment-naïve and previous IFN users, end of treatment virological and biochemical responses were similar with IFN–LAM combination and superior to LAM monotherapy ( P < 0.05). Improvement in liver histology occurred more often with IFN ± LAM than with LAM alone ( P < 0.05). In treatment-naïve patients, combination treatment was not superior to IFN monotherapy. After treatment discontinuation, virological and biochemical response rates decreased in LAM and IFN combination and IFN monotherapy. On treatment virological response at month 6 of treatment predicted sustained virological response. The results of this study suggest that addition of LAM to IFN for the treatment of delta hepatitis is of no additional value and that both treatment modalities are superior to LAM monotherapy. 相似文献