全文获取类型
收费全文 | 65744篇 |
免费 | 3475篇 |
国内免费 | 314篇 |
专业分类
耳鼻咽喉 | 841篇 |
儿科学 | 1666篇 |
妇产科学 | 1318篇 |
基础医学 | 8292篇 |
口腔科学 | 3241篇 |
临床医学 | 4747篇 |
内科学 | 16695篇 |
皮肤病学 | 1340篇 |
神经病学 | 5499篇 |
特种医学 | 1862篇 |
外科学 | 9990篇 |
综合类 | 350篇 |
一般理论 | 24篇 |
预防医学 | 4609篇 |
眼科学 | 1030篇 |
药学 | 3782篇 |
中国医学 | 241篇 |
肿瘤学 | 4006篇 |
出版年
2024年 | 53篇 |
2023年 | 507篇 |
2022年 | 1125篇 |
2021年 | 2321篇 |
2020年 | 1262篇 |
2019年 | 1855篇 |
2018年 | 2269篇 |
2017年 | 1489篇 |
2016年 | 1683篇 |
2015年 | 1935篇 |
2014年 | 2756篇 |
2013年 | 3319篇 |
2012年 | 5382篇 |
2011年 | 5495篇 |
2010年 | 3166篇 |
2009年 | 2655篇 |
2008年 | 4416篇 |
2007年 | 4389篇 |
2006年 | 4211篇 |
2005年 | 4026篇 |
2004年 | 3452篇 |
2003年 | 3113篇 |
2002年 | 2891篇 |
2001年 | 457篇 |
2000年 | 332篇 |
1999年 | 432篇 |
1998年 | 494篇 |
1997年 | 395篇 |
1996年 | 351篇 |
1995年 | 345篇 |
1994年 | 276篇 |
1993年 | 222篇 |
1992年 | 215篇 |
1991年 | 173篇 |
1990年 | 155篇 |
1989年 | 121篇 |
1988年 | 127篇 |
1987年 | 102篇 |
1986年 | 124篇 |
1985年 | 114篇 |
1984年 | 125篇 |
1983年 | 118篇 |
1982年 | 112篇 |
1981年 | 96篇 |
1980年 | 115篇 |
1979年 | 78篇 |
1978年 | 84篇 |
1977年 | 68篇 |
1976年 | 49篇 |
1973年 | 55篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
11.
12.
13.
14.
Iria Montero Prez Laura Rodríguez‐Pazos Adriana lvarez‐Prez MªMercedes Pereiro Ferreirs Carlos Aliste Jose Manuel Suarez‐Pearanda Jaime Toribio 《Journal of cutaneous pathology》2015,42(11):889-893
Classical Kaposi sarcoma (KS) usually appears on lower extremities accompanied or preceded by local lymphedema. However, the development in areas of chronic lymphedema of the arms following mastectomy, mimicking a Stewart–Treves syndrome, has rarely been described. We report an 81‐year‐old woman who developed multiple, erythematous to purple tumors, located on areas of post mastectomy lymphedema. Histopathological examination evidenced several dermal nodules formed by spindle‐shaped cells that delimitated slit‐like vascular spaces with some red cell extravasation. Immunohistochemically, the human herpesvirus type 8 (HHV‐8) latent nuclear antigen‐1 was detected in the nuclei of most tumoral cells confirming the diagnosis of KS. Lymphedema could promote the development of certain tumors by altering immunocompetence. Although angiosarcoma (AS) is the most frequent neoplasia arising in the setting of chronic lymphedema, other tumors such as benign lymphangiomatous papules (BLAP) or KS can also develop in lymphedematous limbs. It is important to establish the difference between AS and KS because their prognosis and treatment are very different. Identification by immunohistochemistry of HHV‐8 is useful for the distinction between KS and AS or BLAP. 相似文献
15.
Journal of Assisted Reproduction and Genetics - 相似文献
16.
17.
18.
19.
Joseane Balan Da Silva Gleison Daion Piovezana Bossolani Camila Piva Greicy Brisa Malaquias Dias Jancarlo Gomes Ferreira Diogo Francisco Rossoni 《International journal of environmental health research》2016,26(5-6):578-588
The spatial distribution of enteroparasitosis in an indigenous village from Paraná was evaluated to identify areas of risk for these infections. A cross-sectional study (from November 2010 to June 2011) was performed using Three Faecal Test® and Kato &; Katz method and a questionnaire on housing and hygiene conditions was administered. Local geostatistical analyses were performed to determine the spatial distribution of intestinal parasitic infections. The overall prevalence of enteroparasites was 67.2?% (457/680), and the most prevalent taxa were Ascaris lumbricoides (48.8?%) and Trichuris trichiura (44.7?%). The prevalence of heavy infection by soil-transmitted helminths was 3.6?% and the families lived in houses with an average of 5.1 residents and < 2 bedrooms per household. The average number of species per individual present spatial heterogeneity with the highest values (≥0.8) in areas with high clustering of residences. The visualization of the spatial distribution of intestinal parasites in this indigenous village is an important contribution to determining health risk areas and planning decisions and services. 相似文献
20.
Diego Dias da Silva Ana Helena da Rosa Paz Ciro Paz Portinho Elizabeth Obino Cirne Lima Lúcia Maria Kliemann Marcus Vinicius Martins Collares 《Acta cirúrgica brasileira / Sociedade Brasileira para Desenvolvimento Pesquisa em Cirurgia》2020,35(12)
Purpose:This study assessed the regeneration potential of mesenchymal stem cells (MSC) from adipose tissue associated with platelet-rich plasma (PRP) in bone regeneration.Methods:Thirty Wistar rats (Rattus norvegicus albinos) were divided into five groups (according to the grafting material and time to euthanasia): (1) autograft - 14 days (control), (2) autograft - 28 days (control), (3) MSC + PRP - 14 days, (4) MSC + PRP + papaverine - 14 days and (5) MSC + PRP + papaverine - 28 days. After euthanasia, the graft was removed and histological slides were prepared. They were assessed by a blinded pathologist using a previously published histological scale as parameter.Results:There was some degree of neoformed bone trabeculae (NBT) in 93.3% of the samples, as well as osteoblastic activity (OA). The autograft groups (14 and 28 days) had higher levels in the formation of bone trabeculae. Nonparametric data were analyzed using the Wilcoxon-Mann-Whitney test and proved not to be statistically significant at p < 0.05.Conclusions:Experimental parietal bone reconstruction, combining MSC, PRP and papaverine presented regeneration in all groups with no significant difference among them.Key words: Bone Regeneration, Platelet-Rich Plasma, Tissue Engineering, Rats 相似文献