全文获取类型
收费全文 | 5748篇 |
免费 | 381篇 |
国内免费 | 13篇 |
专业分类
耳鼻咽喉 | 104篇 |
儿科学 | 292篇 |
妇产科学 | 80篇 |
基础医学 | 609篇 |
口腔科学 | 84篇 |
临床医学 | 455篇 |
内科学 | 1255篇 |
皮肤病学 | 104篇 |
神经病学 | 356篇 |
特种医学 | 126篇 |
外科学 | 1063篇 |
综合类 | 104篇 |
一般理论 | 3篇 |
预防医学 | 360篇 |
眼科学 | 226篇 |
药学 | 512篇 |
中国医学 | 20篇 |
肿瘤学 | 389篇 |
出版年
2023年 | 52篇 |
2022年 | 103篇 |
2021年 | 220篇 |
2020年 | 129篇 |
2019年 | 172篇 |
2018年 | 211篇 |
2017年 | 136篇 |
2016年 | 175篇 |
2015年 | 176篇 |
2014年 | 255篇 |
2013年 | 274篇 |
2012年 | 383篇 |
2011年 | 379篇 |
2010年 | 235篇 |
2009年 | 208篇 |
2008年 | 335篇 |
2007年 | 383篇 |
2006年 | 383篇 |
2005年 | 310篇 |
2004年 | 289篇 |
2003年 | 266篇 |
2002年 | 214篇 |
2001年 | 91篇 |
2000年 | 60篇 |
1999年 | 51篇 |
1998年 | 51篇 |
1997年 | 29篇 |
1996年 | 40篇 |
1995年 | 18篇 |
1994年 | 23篇 |
1993年 | 30篇 |
1992年 | 29篇 |
1991年 | 33篇 |
1990年 | 29篇 |
1989年 | 30篇 |
1988年 | 38篇 |
1987年 | 35篇 |
1986年 | 30篇 |
1985年 | 17篇 |
1984年 | 22篇 |
1983年 | 16篇 |
1982年 | 11篇 |
1981年 | 13篇 |
1980年 | 15篇 |
1977年 | 13篇 |
1975年 | 13篇 |
1974年 | 14篇 |
1973年 | 13篇 |
1972年 | 14篇 |
1970年 | 19篇 |
排序方式: 共有6142条查询结果,搜索用时 15 毫秒
11.
Khalid Irshad Samuel Millar Raj Velu Allan W Reid Edward B Diethrich Donald B Reid 《Journal of endovascular therapy》2007,14(2):198-207
PURPOSE: To report early clinical experience with virtual histology intravascular ultrasound (VH IVUS) in carotid endoluminal repair. TECHNIQUE: A 2.9-F, 20-MHz catheter that utilizes computer software to demonstrate the histological components of arteriosclerotic plaque was evaluated during carotid angioplasty and stenting. VH IVUS images were created following a pullback through the carotid stenosis and produced a color-coded map of the different histological constituents of the disease (dark green: fibrous, yellow/green: fibrofatty, white: calcified, and red: necrotic lipid core plaque). CONCLUSION: VH IVUS produces a color-coded map of the different histological components of artery plaque. It has the potential to predict how the plaque is likely to behave at the moment of endoluminal treatment. 相似文献
12.
Ruma Pahwa Nita Khurana K Uma Chaturvedi Anoop Raj 《Indian journal of otolaryngology and head and neck surgery》2003,55(3):193-194
Neurilemmoma is usually soimry, benign tumour derived from schwan cells of the Sheaths of peripheral cranial or autonomie
nerves. In thehead and neck region it occurs most commonly in association with acoustic nerve within the skuil and is rely
fottnd in the oral cavity (1,2). We report here two cases of the iongue diagnosed on histopathohgy. 相似文献
13.
14.
15.
16.
Dhawan Subhash; Puri Raj K.; Kumar Ashok; Duplan Helen; Masson Jean-Michel; Aggarwal Bharat B. 《Blood》1997,90(4):1535-1544
17.
Raj P. Kapur Ian Neilson Robert M.W. Hofstra Lynda W. Holloway Ron C. Michaelis Kathleen A. Leppig 《American journal of medical genetics. Part A》2002,108(1):51-56
Congenital hydrocephalus associated with aqueductal stenosis and/or agenesis of the corpus callosum has been described in newborn males with mutations in L1CAM, a gene that encodes a neural cell adhesion molecule. These males usually have severe mental retardation and may have spastic paraplegia and adducted thumbs. In contrast, Hirschsprung disease, or absence of ganglion cells in the distal gut, has rarely been described in such individuals. We report a male infant who had severe hydrocephalus identified in the prenatal period with evidence of aqueductal stenosis and adducted thumbs at birth. He developed chronic constipation, and rectal biopsy confirmed the diagnosis of Hirschsprung disease. Molecular testing of the L1CAM gene revealed a G2254A mutation, resulting in a V752M amino acid substitution. A common polymorphism in RET, but no mutation, was identified. Our patient represents the third example of coincident hydrocephalus and Hirschsprung disease in an individual with an identified L1CAM mutation. We hypothesize that L1CAM‐mediated cell adhesion may be important for the ability of ganglion cell precursors to populate the gut, and that L1CAM may modify the effects of a Hirschsprung disease–associated gene to cause intestinal aganglionosis. © 2002 Wiley‐Liss, Inc. 相似文献
18.
Cyclohexanone was condensed with N-hydroxymethyl benzamide in conc. sulphuric acid to give alpha-methyl-benzamido-cyclohexanone (I). The reaction of (I) with thiosemicarbazide in ethanol resulted in alpha-methyl-benzamido-cyclohexanone thiosemicarbazone (II). Condensation of (II) with various aromatic aldehydes in the presence of ethanol afforded alpha-methyl-benzamido-alpha'-substituted-styryl-cyclohexanone thiosemicarbazones (III) in yields ranging from 40 to 50 percent. The compounds exhibited pronounced antiimplantation activity in female albino rats. 相似文献
19.
Transformation of Penicillium chrysogenum using the Aspergillus nidulans amdS gene as a dominant selective marker 总被引:5,自引:0,他引:5
Summary The Aspergillus nidulans acetamidase gene (amdS) has been used to transform Penicillium chrysogenum at low frequency. Several transformants were tested and shown to be mitotically stable. Southern blot analysis indicated that transforming DNA had integrated into the chromosomal DNA, possibly at multiple sites. 相似文献
20.
Khaidem Ibochouba Singh Jigme Tenzing Shartsho Waikhom Ruhini Kumar Singh Raj Kumari Tamphasana Devi Ahongshangbam Meina Singh 《Indian journal of hematology & blood transfusion》2007,23(3-4):116-118
Two children out of three siblings of a family presented with tiredness, fatigue, and breathlessness for more than 6 months. Examination of peripheral blood smear, bone marrow aspirate, and a positive acidified serum test (HEMPAS) revealed these children to be a case of congenital dyserythropoietic anemia type II. This case is reported because of its rarity. 相似文献