全文获取类型
收费全文 | 12420篇 |
免费 | 835篇 |
国内免费 | 58篇 |
专业分类
耳鼻咽喉 | 79篇 |
儿科学 | 384篇 |
妇产科学 | 362篇 |
基础医学 | 1770篇 |
口腔科学 | 205篇 |
临床医学 | 1403篇 |
内科学 | 2604篇 |
皮肤病学 | 280篇 |
神经病学 | 1401篇 |
特种医学 | 416篇 |
外科学 | 1057篇 |
综合类 | 97篇 |
一般理论 | 1篇 |
预防医学 | 1100篇 |
眼科学 | 363篇 |
药学 | 663篇 |
中国医学 | 26篇 |
肿瘤学 | 1102篇 |
出版年
2023年 | 138篇 |
2022年 | 226篇 |
2021年 | 464篇 |
2020年 | 301篇 |
2019年 | 424篇 |
2018年 | 401篇 |
2017年 | 322篇 |
2016年 | 368篇 |
2015年 | 386篇 |
2014年 | 502篇 |
2013年 | 716篇 |
2012年 | 1021篇 |
2011年 | 1043篇 |
2010年 | 547篇 |
2009年 | 448篇 |
2008年 | 807篇 |
2007年 | 821篇 |
2006年 | 714篇 |
2005年 | 630篇 |
2004年 | 611篇 |
2003年 | 548篇 |
2002年 | 543篇 |
2001年 | 74篇 |
2000年 | 68篇 |
1999年 | 92篇 |
1998年 | 96篇 |
1997年 | 69篇 |
1996年 | 56篇 |
1995年 | 46篇 |
1994年 | 54篇 |
1993年 | 50篇 |
1992年 | 44篇 |
1991年 | 53篇 |
1990年 | 32篇 |
1989年 | 35篇 |
1988年 | 31篇 |
1987年 | 35篇 |
1986年 | 23篇 |
1985年 | 31篇 |
1984年 | 33篇 |
1983年 | 26篇 |
1982年 | 31篇 |
1981年 | 34篇 |
1980年 | 33篇 |
1979年 | 21篇 |
1978年 | 25篇 |
1977年 | 17篇 |
1976年 | 17篇 |
1975年 | 16篇 |
1974年 | 18篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
32.
Corinne Besnard-Gurin Webster Cavenee Irene Newshams 《Genes, chromosomes & cancer》1995,13(3):145-150
Translocations and deletions involving chromosomal band 22q 11 are common genetic aberrations in malignant rhabdoid tumors. Previous molecular analyses of a t(11; 22) in the malignant rhabdoid tumor cell line TM87-16 localized the breakpoint distal to BCR on 22q 11. In the present report, we have further refined the map position of this breakpoint between CRYBB2 and D22S258. Moreover, the D22S258, CRYBA4, D22S300, D22SI, and D22S310 loci, which lie between CRYBB2 and D22S42, were found to be deleted, presumably as a result of the translocation event. The identification of this deletion of at least 2 Mb on the long arm of chromosome 22 should be helpful for mapping the gene(s) in the region involved in the development of malignant rhabdoid tumors as well as providing insights into the mechanisms of chromosomal translocation in human solid tumors. 相似文献
33.
Baris O Delettre C Amati-Bonneau P Surget MO Charlin JF Catier A Derieux L Guyomard JL Dollfus H Jonveaux P Ayuso C Maumenee I Lorenz B Mohammed S Tourmen Y Bonneau D Malthièry Y Hamel C Reynier P 《Human mutation》2003,21(6):656-656
The OPA1 gene, encoding a dynamin-related GTPase that plays a role in mitochondrial biogenesis, is implicated in most cases of autosomal dominant optic atrophy (ADOA). Sixty-nine pathogenic OPA1 mutations have been reported so far. Most of these are truncating mutations located in the GTPase domain coding region (exons 8-16) and at the 3'-end (exons 27-28). We screened 44 patients with typical ADOA using PCR-sequencing. We also tested 20 sporadic cases of bilateral optic atrophy compatible with ADOA. Of the 18 OPA1 mutations found, 14 have never been previously reported. The novel mutations include one nonsense mutation, 3 missense mutations, 6 deletions, one insertion and 3 exon-skipping mutations. Two of these are de novo mutations, which were found in 2 patients with sporadic optic atrophy. The recurrent c.2708_2711delTTAG mutation was found in 2 patients with a severe congenital presentation of the disease. These results suggest that screening for OPA1 gene mutations may be useful for patients with optic atrophy who have no affected relatives, or when the presentation of the disease is atypical as in the case of early onset optic atrophy. 相似文献
34.
35.
Urbasch I 《Planta medica》1985,51(6):492-494
8 cultivars of the commercial tomato ( LYCOPERSICON ESCULENTUM) and 4 species of wild tomato plants ( L. HIRSUTUM, L. PIMPINELLIFOLIUM, L. GLANDULOSUM, L, PERUVIANUM) were investigated with regard to their production of 2-tridecanone in leaflets, petioles and stems during different stages of development and under different conditions of cultivation. The significance of 2-tridecanone as defence substance against fungal pathogens and pests of LYCOPERSICON spp. is discussed. 相似文献
36.
Somba Magreat Kaaya Sylvia Siril Hellen Oljemark Kicki Ainebyona Donald McAdam Elspeth Todd James Andrew Irene McAdam Keith Simwinga Alice Mleli Neema Makongwa Samwel Haberlen Sabina Fawzi Mary C. Smith 《Prevention science》2021,22(7):940-949
Prevention Science - The NAMWEZA intervention was implemented, using a ten-session group format, to build skills targeting psychosocial vulnerabilities and enhancing HIV prevention among people... 相似文献
37.
38.
Tammy Ju MD Deshka Foster MD PhD Ashley Titan MD Saleh Najjar MD Gregory R. Bean MD PhD Kristen Ganjoo MD Irene Wapnir MD 《The breast journal》2021,27(9):723-725
Radiation-induced breast angiosarcoma, or secondary angiosarcoma (SAS), is a rare entity with a high risk of metastatic recurrence. Herein, we describe the use of intraoperative fluorescence-based skin angiography to guide surgical resection following a novel immunotherapy-based regimen for SAS resulting in a complete pathological response. 相似文献
39.
Rota GC Stein JA 《Proceedings of the National Academy of Sciences of the United States of America》1990,87(23):9250-9254
It is shown that the Hopf algebra dual of a supersymmetric Hopf algebra admits two presentations, and a natural isomorphism between them is described. 相似文献
40.
Rota GC Stein JA 《Proceedings of the National Academy of Sciences of the United States of America》1994,91(26):13062-13066
An isomorphism is established between the plethystic Hopf algebra Pleth(Super[L]) and the algebra of vector symmetric functions. The Hall inner product of symmetric function theory is extended to the Hopf algebra Pleth(Super[L]). 相似文献