全文获取类型
收费全文 | 3053篇 |
免费 | 127篇 |
国内免费 | 5篇 |
专业分类
耳鼻咽喉 | 23篇 |
儿科学 | 59篇 |
妇产科学 | 63篇 |
基础医学 | 705篇 |
口腔科学 | 32篇 |
临床医学 | 285篇 |
内科学 | 789篇 |
皮肤病学 | 21篇 |
神经病学 | 168篇 |
特种医学 | 80篇 |
外国民族医学 | 1篇 |
外科学 | 412篇 |
综合类 | 14篇 |
一般理论 | 1篇 |
预防医学 | 180篇 |
眼科学 | 19篇 |
药学 | 188篇 |
中国医学 | 29篇 |
肿瘤学 | 116篇 |
出版年
2023年 | 21篇 |
2022年 | 66篇 |
2021年 | 130篇 |
2020年 | 52篇 |
2019年 | 91篇 |
2018年 | 70篇 |
2017年 | 52篇 |
2016年 | 58篇 |
2015年 | 81篇 |
2014年 | 103篇 |
2013年 | 134篇 |
2012年 | 183篇 |
2011年 | 198篇 |
2010年 | 80篇 |
2009年 | 94篇 |
2008年 | 138篇 |
2007年 | 166篇 |
2006年 | 149篇 |
2005年 | 128篇 |
2004年 | 125篇 |
2003年 | 97篇 |
2002年 | 106篇 |
2001年 | 22篇 |
2000年 | 35篇 |
1999年 | 45篇 |
1998年 | 19篇 |
1995年 | 13篇 |
1994年 | 12篇 |
1992年 | 28篇 |
1991年 | 27篇 |
1990年 | 22篇 |
1989年 | 15篇 |
1986年 | 14篇 |
1984年 | 13篇 |
1982年 | 12篇 |
1936年 | 28篇 |
1935年 | 32篇 |
1934年 | 32篇 |
1933年 | 35篇 |
1932年 | 29篇 |
1931年 | 24篇 |
1930年 | 29篇 |
1929年 | 26篇 |
1928年 | 24篇 |
1927年 | 22篇 |
1926年 | 22篇 |
1925年 | 20篇 |
1924年 | 21篇 |
1923年 | 14篇 |
1922年 | 18篇 |
排序方式: 共有3185条查询结果,搜索用时 0 毫秒
41.
Anti‐Shiga toxin 2 antibodies in enterohemorrhagic Escherichia coli O104:H4 infected patients may predict hemolytic uremic syndrome 下载免费PDF全文
42.
43.
44.
Latent myopathy is more pronounced in patients with low flow versus normal flow aortic stenosis with normal left ventricular ejection fraction who are undergoing surgical aortic valve replacement: Multicenter study with a brief review of the literature 下载免费PDF全文
45.
Aleksey V. Larionov Maxim Y. Sinitsky Vladimir G. Druzhinin Valentin P. Volobaev Varvara I. Minina Maxim A. Asanov 《International journal of radiation biology》2016,92(8):466-474
Purpose: To study polymorphic variants of repair genes in people affected by long-term exposure to radon. The chromosome aberration frequency in peripheral blood lymphocytes was used as the biological marker of genotoxicity.Materials and methods: Genotyping of 12 single nucleotide polymorphisms in DNA repair genes (APE, XRCC1, OGG1, ADPRT, XpC, XpD, XpG, Lig4 and NBS1) was performed in children with long-term resident exposure to radon. Quantification of the aberrations was performed using light microscopy.Results: The total frequency of aberrations was increased in carriers of the G/G genotype for the XpD gene (rs13181) polymorphism in recessive model confirmed by the results of ROC-analysis (‘satisfactory predictor’, AUC?=?0.609). Single chromosome fragments frequency was increased in carriers of the G/G genotype in comparison with the T/T genotype. In respect to the total frequency of aberrations, the G/G genotype for the XpG gene (rs17655) polymorphism was also identified as a ‘satisfactory predictor’ (AUC?=?0.605). Carriers of the T/C genotype for the ADPRT gene (rs1136410) polymorphism were characterized by an increased level of single fragments relative to the T/T genotype.Conclusion: The relationships with several types of cytogenetic damage suggest these three SNP (rs13181, rs17655 and rs1136410) may be considered radiosensitivity markers. 相似文献
46.
This paper discusses collar spine arrangements in the genus Echinostoma. All arrangements are of uneven numbers of collar spines on the oral collar. The total number of collar spines in these arrangements
ranges from a low 31 to a high 51. There are 11 models of collar spine arrangements in the Echinostoma consisting of spine numbers 31, 33, 35, 37, 39, 41, 43, 45, 47, 49, and 51. Representative species with these collar spine
arrangements are given in the article. The number of collar spines in a species is identical in both the larval and adult
forms. Reports of even numbered spine counts in the genus Echinostoma are erroneous and probably reflect counts on worms with lost, retracted, or supernumerary spines. 相似文献
47.
Sidney C Smith Ted E Feldman John W Hirshfeld Alice K Jacobs Morton J Kern Spencer B King Douglass A Morrison William W O'Neill Hartzell V Schaff Patrick L Whitlow David O Williams Elliott M Antman Sidney C Smith Cynthia D Adams Jeffrey L Anderson David P Faxon Valentin Fuster Jonathan L Halperin Loren F Hiratzka Sharon Ann Hunt Alice K Jacobs Rick Nishimura Joseph P Ornato Richard L Page Barbara Riegel 《Journal of the American College of Cardiology》2006,47(1):e1-121
48.
J P Valentin J Ribstein A Mimran 《Archives des maladies du coeur et des vaisseaux》1989,82(7):1253-1255
Peripheral edema without fluid retention is a common side effect of treatment with calcium antagonists (CA). The possibility that CA may alter extracellular fluid partition between plasma and interstitium, as suggested for atrial natriuretic peptide (ANP) was explored in binephrectomized anesthetized rats by measuring changes in hematocrit and plasma protein concentration during infusion of synthetic 103-126 ANP (Wy 47.663) and the dihydropyridine derivate nicardipine. After a forty minutes infusion of ANP (1 microgram/kg/mn), hematocrit and plasma protein increased 9.1 +/- 0.3 and 3.9 +/- 0.3 p. 100 respectively; the calculated loss of plasma volume during ANP infusion was 14.5 +/- 1.1 p. 100 as compared to 3.9 +/- 0.6 p. 100 in rats receiving vehicle only. Infusion of nicardipine at 1 microgram/kg/mn increased hematocrit by 5.7 +/- 0.2 p. 100 (corresponding to a 9.1 +/- 0.9 p. 100 decrease in plasma volume), and plasma proteins by 3.7 +/- 0.2 p. 100. To document and localize an alteration in vascular leak of proteins induced by the drugs, albumin-bound Evans blue (EB) extravasation was measured spectrophotometrically in different tissues after extraction by methyl-formamide. Both ANP and nicardipine increased vascular penetration of EB-albumin, mainly in skeletal and cardiac muscle; no changes was observed in brain, liver, spleen as compared to rats receiving the vehicle; ANP but not nicardipine increase EB-albumin permeability in intestine. These results suggest that nicardipine as well as ANP reduce plasma volume by increasing vascular leak of fluids and macromolecules. 相似文献
49.
Steinberg JS Arshad A Kowalski M Kukar A Suma V Vloka M Ehlert F Herweg B Donnelly J Philip J Reed G Rozanski A 《Journal of the American College of Cardiology》2004,44(6):1261-1264
OBJECTIVES: This study was designed to evaluate whether the destruction of the World Trade Center (WTC) on September 11, 2001 (9/11), led to an increased frequency of ventricular arrhythmias among patients fitted with an implantable cardioverter-defibrillator (ICD). BACKGROUND: The WTC attack induced psychological distress. Because ICDs store all serious arrhythmias for months, the attack provided a unique opportunity to compare pre- and post-9/11 frequencies of potentially lethal arrhythmias among ICD patients. METHODS: Two hundred consecutive ICD patients who presented for regularly scheduled follow-up to six affiliated clinics were recruited into this observational study. The electrograms stored in the ICDs for the three months before 9/11 and 13 months thereafter were scrutinized in a blinded manner (relative to date) for all ventricular tachyarrhythmias (tachycardia or fibrillation) triggering ICD therapy. RESULTS: The frequency of tachyarrhythmias increased significantly for the 30 days post-9/11 (p = 0.004) relative to all other months between May 2001 and October 2002. In the 30 days post-9/11, 16 patients (8%) demonstrated tachyarrhythmias, compared with only seven (3.5%) in the preceding 30 days, representing a 2.3-fold increase in risk (95% confidence interval 1.1 to 4.9; p = 0.03). The first arrhythmic event did not occur for three days following 9/11, with events accumulating in a progressive non-clustered pattern. CONCLUSIONS: Ventricular arrhythmias increased by more than twofold among ICD patients following the WTC attack. The delay in onset and the non-clustered pattern of these events differ sharply from effects following other disasters, suggesting that subacute stress may have served to promote this arrhythmogenesis. 相似文献
50.