全文获取类型
收费全文 | 773篇 |
免费 | 34篇 |
国内免费 | 5篇 |
专业分类
耳鼻咽喉 | 5篇 |
儿科学 | 41篇 |
妇产科学 | 28篇 |
基础医学 | 69篇 |
口腔科学 | 58篇 |
临床医学 | 44篇 |
内科学 | 126篇 |
皮肤病学 | 7篇 |
神经病学 | 40篇 |
特种医学 | 42篇 |
外科学 | 236篇 |
综合类 | 4篇 |
预防医学 | 16篇 |
眼科学 | 55篇 |
药学 | 23篇 |
中国医学 | 1篇 |
肿瘤学 | 17篇 |
出版年
2023年 | 3篇 |
2022年 | 16篇 |
2021年 | 29篇 |
2020年 | 16篇 |
2019年 | 21篇 |
2018年 | 20篇 |
2017年 | 17篇 |
2016年 | 16篇 |
2015年 | 29篇 |
2014年 | 37篇 |
2013年 | 44篇 |
2012年 | 56篇 |
2011年 | 61篇 |
2010年 | 36篇 |
2009年 | 39篇 |
2008年 | 50篇 |
2007年 | 65篇 |
2006年 | 53篇 |
2005年 | 63篇 |
2004年 | 38篇 |
2003年 | 30篇 |
2002年 | 32篇 |
2001年 | 2篇 |
2000年 | 6篇 |
1999年 | 1篇 |
1998年 | 3篇 |
1997年 | 5篇 |
1996年 | 4篇 |
1995年 | 5篇 |
1994年 | 2篇 |
1993年 | 1篇 |
1992年 | 4篇 |
1991年 | 1篇 |
1984年 | 1篇 |
1982年 | 1篇 |
1980年 | 1篇 |
1974年 | 2篇 |
1972年 | 1篇 |
1971年 | 1篇 |
排序方式: 共有812条查询结果,搜索用时 0 毫秒
51.
Gündogan NU Durmazlar N Gümüş K Ozdemir PG Altintaş AG Durur I Acaroglu G 《The International journal of neuroscience》2005,115(8):1105-1117
This article compared the efficiency of the mass screening test with projected color slides in detecting color-blindness with the authentic classic method of Ishihara. The study was conducted in a randomly selected lecture room with 104 students aged between 19-25 years (median 21). Using Ishihara projected slides, performed mass screening test. Re-testing was done individually with printed Ishihara plates. Six male and one female with color-blindness were detected. The frequency of color-blindness was 13.6% among males, with a total incidence of 6.7%. The results of two testing methods were compared statistically. Sensitivities and specificities of both tests were 100%. Using projected slides of Ishihara plates instead of the authentic method is an effective and timesaving method for detecting color-blindness. This method can be suggested as a mass-screening test and might be beneficial in detecting color-blindness in large populations such as students, soldiers, and so on. 相似文献
52.
53.
Exposure to low outdoor temperature in the midtrimester is associated with low birth weight 总被引:1,自引:0,他引:1
Elter K Ay E Uyar E Kavak ZN 《The Australian & New Zealand journal of obstetrics & gynaecology》2004,44(6):553-557
BACKGROUND: Although seasonal variation of birth weight has been reported previously, contributing factors such as the meteorological factor and its specific period of exposure remain unclear. AIM: To investigate the effect of season on birth weight and to determine the meteorological factor and its specific period of exposure which can contribute to any seasonal variation in birth weight. METHODS: Retrospective analysis of 3333 singleton live births after 36 completed weeks of pregnancy. Maternal age, parity, route of delivery, sex and individual meteorological variables for the first, second, and third trimesters of each pregnancy were analysed using multiple regression analysis with the birth weight as the dependent variable. RESULTS: A seasonal pattern was observed with lowest birth weights in women who had their last menstrual periods in summer and autumn. Upon multiple regression analysis, sex, parity, mode of delivery, and the temperature which the mother was exposed to in the second trimester were the independent determinants of birth weight. CONCLUSION: Exposure to low outdoor ambient temperature in the midtrimester can be associated with low birth weight. 相似文献
54.
A simple scoring system to evaluate the effects of cold ischemia on marginal liver donors 总被引:4,自引:0,他引:4
Tekin K Imber CJ Atli M Gunson BK Bramhall SR Mayer D Buckels JA McMaster P Mirza DF 《Transplantation》2004,77(3):411-416
BACKGROUND: Exactly what constitutes a marginal donor remains ill defined. The authors set out to create a scoring system that objectively classifies a donor as marginal or nonmarginal and to define what the maximum acceptable preservation period is for the marginal liver to minimize early graft dysfunction. METHODS: The authors performed an analysis on data collected prospectively of 397 cadaveric liver transplants. Both univariate and multivariate analyses were performed on donor, recipient, and perioperative factors with relation to early allograft dysfunction. A score was developed that classified donors into marginal and nonmarginal populations, and the influence of cold ischemia was determined for each group. RESULTS: Multivariate analysis-determined donor age and steatosis (moderate to severe) were independent predictors of deranged function. This enabled the authors to produce a scoring system to differentiate marginal donors with respect to risk of early allograft dysfunction as follows: Formula=(20.06xsteatosis)+(0.44xdonor age), cutoff 23.1. In the marginal group, the cutoff value of cold ischemia time was 12.6 hr. CONCLUSIONS: The authors developed a scoring system that classified an organ as marginal or nonmarginal depending on the donor age and degree of steatosis. Marginal livers have a strong risk of developing early allograft dysfunction with increasing cold ischemia times and should be transplanted within 12 hr. Cold ischemia time was not found to be an important factor in the development of early allograft dysfunction in nonmarginal donors. 相似文献
55.
Hüseyin Astarciolu Sedat Karademir Koray Atila
zgül Saol Hilal Kodor Ahmet oker Ibrahim Astarciolu 《Transplant international》2004,17(4):188-194
Disturbed microcirculation caused by fat accumulation in hepatocytes has been implicated in poor graft preservation and reperfusion. The aim of this study was to investigate the effect of vascular bed expansion (VBE) during cold preservation in graft survival Moderate liver steatosis in male Wistar rats (240–280 g) was induced by choline-deficient diet. Normal, steatotic or VBE-pretreated steatotic grafts were transplanted after 1 h or 9 h of cold preservation. Graft viability was determined by 7-day survival, serum liver enzymes, plasma tumour necrosis factor (TNF)-, interleukin (IL)-6, and malondialdehyde (MDA) levels. Post-reperfusion bile flow and liver histology were also examined. After 9 h of preservation, VBE-pretreated steatotic liver grafts were associated with significantly reduced serum liver enzyme, plasma TNF-, IL-6, and MDA levels, as well as increased bile flow and higher survival rates compared with untreated ones. The present study shows that VBE protects fatty liver grafts from subsequent long-term cold preservation and reperfusion injury in a rat liver transplantation model. 相似文献
56.
Giant cell tumor of the tendon sheath (GCTTS) is the second most common benign tumor of the hand. Although bony indentation from external compression by the GCTTS is frequently seen on x-ray film, the intraosseous invasion is relatively rare and is a sign for high recurrence. We present a woman with extensive GCTTS located in the left index finger at the level of distal interphalangeal joint. X-ray films revealed multiple osteolytic cystic cavities in the shaft of the middle phalanx. Amputation of the index finger at the base of the middle phalanx was performed because of extensive bony involvement and concern about possible recurrence from inadequate excision. Her left second toe was transferred to replace the amputated index finger in the same session. Follow-up examination at 15 months postoperative revealed good function and appearance of the reconstructed index. 相似文献
57.
Görgün FM Kökoğlu E Gümüştaş MK Altuğ T Cansever S Kavunoğlu G 《Journal of toxicology and environmental health. Part A》2004,67(13):979-986
The aim of this study was to determine the effects of streptozotocin-induced diabetes on plasma reduced glutathione (GSH) and S-nitrosoglutathione (GSNO) levels. Further, the study investigated whether an antioxidant, pineal hormone melatonin, could protect against STZ-induced effects. STZ significantly decreased plasma GSH but increased the levels of plasma GSNO. Daily supplementation with melatonin restored plasma thiol to control values. Data suggest that STZ-induced hyperglycemia and compounds that act as scavengers of free radicals and peroxynitrite like melatonin may exert protection against STZ-induced toxicity. 相似文献
58.
?ahin??obanEmail author Osman?Yüksel Seyfettin?K?klü Koray?Ceyhan Meltem?Baykara Abdulkadir?D?kmeci 《BMC cancer》2004,4(1):89
Background
Hepatocellular carcinoma is a common malignancy for which chronic hepatitis B infection has been defined as the most common etiologic factor. The most frequent metastatic sites are the lung, bone, lymphatics, and brain, respectively. Metastases to the chest wall have been reported only rarely.Case presentation
We report a patient with hepatocellular carcinoma who presented with an isolated metastatic mass on the left anterolateral chest wall in the axillary region.Conclusions
Metastasis of HCC should be included in the differential diagnosis of rapidly growing lesions in unusual localizations, particularly in patients with chronic liver disease even if a primary tumor can not be radiologically identified.59.
Elter K Ay E Erenus M 《European journal of obstetrics, gynecology, and reproductive biology》2003,109(2):138-140
OBJECTIVE(S): To investigate whether the mode of delivery effects the birthweight. STUDY DESIGN: In this retrospective study, 3092 singleton live births following uncomplicated pregnancies were analyzed. Birthweights were expressed as multiples of the median (MoM) for the relevant gestational week. The birthweight of children born vaginally was compared with those born by cesarean section. RESULTS: The birthweight of children born vaginally was lower than that of those born by cesarean section. However, this difference was not observed at all gestational ages. Increasing cesarean rates and birthweights throughout years were observed, and the women, who delivered by cesarean section, were older than those, who delivered vaginally. CONCLUSION(S): It appears that mode of delivery has negligible effect on birthweight. 相似文献
60.
Leptin receptor variant in women with polycystic ovary syndrome 总被引:3,自引:0,他引:3