全文获取类型
收费全文 | 35789篇 |
免费 | 2326篇 |
国内免费 | 175篇 |
专业分类
耳鼻咽喉 | 413篇 |
儿科学 | 900篇 |
妇产科学 | 883篇 |
基础医学 | 5372篇 |
口腔科学 | 1951篇 |
临床医学 | 3075篇 |
内科学 | 7862篇 |
皮肤病学 | 1087篇 |
神经病学 | 3183篇 |
特种医学 | 617篇 |
外科学 | 3044篇 |
综合类 | 144篇 |
一般理论 | 23篇 |
预防医学 | 3844篇 |
眼科学 | 630篇 |
药学 | 2855篇 |
中国医学 | 203篇 |
肿瘤学 | 2204篇 |
出版年
2024年 | 36篇 |
2023年 | 428篇 |
2022年 | 405篇 |
2021年 | 1749篇 |
2020年 | 995篇 |
2019年 | 1390篇 |
2018年 | 1708篇 |
2017年 | 1122篇 |
2016年 | 1097篇 |
2015年 | 1338篇 |
2014年 | 1780篇 |
2013年 | 2189篇 |
2012年 | 3318篇 |
2011年 | 3456篇 |
2010年 | 1748篇 |
2009年 | 1471篇 |
2008年 | 2415篇 |
2007年 | 2365篇 |
2006年 | 2047篇 |
2005年 | 1806篇 |
2004年 | 1539篇 |
2003年 | 1297篇 |
2002年 | 1133篇 |
2001年 | 146篇 |
2000年 | 94篇 |
1999年 | 121篇 |
1998年 | 152篇 |
1997年 | 146篇 |
1996年 | 89篇 |
1995年 | 72篇 |
1994年 | 76篇 |
1993年 | 66篇 |
1992年 | 72篇 |
1991年 | 52篇 |
1990年 | 42篇 |
1989年 | 28篇 |
1988年 | 30篇 |
1987年 | 23篇 |
1986年 | 26篇 |
1985年 | 22篇 |
1984年 | 18篇 |
1983年 | 15篇 |
1982年 | 15篇 |
1980年 | 17篇 |
1979年 | 21篇 |
1978年 | 10篇 |
1977年 | 11篇 |
1976年 | 10篇 |
1974年 | 10篇 |
1973年 | 14篇 |
排序方式: 共有10000条查询结果,搜索用时 312 毫秒
1.
2.
3.
Selwyn Arlington Headley Nayara Emily Viana Mariana de Mello Zanim Michelazzo Ana Aparecida Correa Xavier Cícero Júlio Silva Costa Felipe Hideki Ogo de Pinho Marcelo Diniz dos Santos 《Transboundary and Emerging Diseases》2020,67(Z2):49-59
Neorickettsia helminthoeca (NH), the agent of salmon poisoning disease or canine neorickettiosis (CN), is a bacterial endosymbiont of the nematode Nanophyetus salmincola, and infections are spreading among specific fish‐eating mammalians. This article describes the pathologic and immunohistochemical findings associated with spontaneous NH‐induced infections in dogs from Southern Brazil. The principal pathologic findings were hypertrophy of Peyer patches and lymphadenopathy with lymphocytic proliferation, chronic interstitial pneumonia, and chronic enteritis associated with positive intralesional immunoreactivity to antigens of NH within macrophages and histiocytes. Positive immunoreactivity against canine parvovirus‐2 (CPV‐2) or/and canine distemper virus was not detected in the evaluated intestinal segments or in the samples from the cerebellum and lungs, respectively, from the dogs evaluated. These findings demonstrated that NH was involved in the enteric, pulmonary, and lymphoid lesions herein described, and provide additional information to confirm the occurrence of this bacterial endosymbiont within this geographical location. It is proposed that chronic pneumonia should be considered as a pathologic manifestation of NH‐induced infections. Additionally, our results show that the occurrences of CN seem to be underdiagnosed in Southern Brazil due to the confusion with the incidence of CPV‐2. 相似文献
4.
5.
Responsive feeding (RF) has been recognized as necessary to prevent all forms of malnutrition including stunting and childhood obesity. Specific RF guidelines have been developed, but it is unclear how RF behaviours can be monitored systematically. Therefore, developing valid and reliable abbreviated and pragmatic RF scales is an important global priority. This is challenging, as RF is a construct with multiple dimensions including recognizing and responding to hunger and satiety cues, providing a nurturing environment during feeding episodes, and understanding how feeding needs evolve as a function of the developmental stage of the young child. Further, RF is embedded within the responsive parenting framework that in addition to RF includes sleep, soothing and play routines and the interconnections between them. A recent pioneer study conducted in a rural area of Cambodia validated an 8‐item RF scale through direct feeding observations of 6‐ to 23‐month‐old infants at home, as part of two cross‐sectional surveys conducted before and after a complementary feeding intervention. It is important for similar research to be conducted elsewhere to find out if it is possible or not to develop a core RF scale that is valid and reliable and that has adequate specificity and sensitivity for application in community studies and population surveys globally. As highlighted in this article, different definitions of RF have been used in the field; thus, it is important to reach consensus on a single definition to help move this research area forward. 相似文献
6.
7.
8.
Primary cutaneous anaplastic large cell lymphomas with 6p25.3 rearrangement exhibit particular histological features 下载免费PDF全文
9.
10.
Iva Justini Ana Kati Deni Uri
i Boena urko‐Cofek Branka Blagovi Gordana anadi Jurei 《Environmental toxicology》2020,35(3):346-358
The yeast Saccharomyces cerevisiae is a useful model for studying the influence of different stress factors on eukaryotic cells. In this work we used the pesticide imidacloprid, in the Confidor formulation, as the stress factor and analyzed its influence on the metabolic activity, proteome and lipid content and composition of Saccharomyces cerevisiae yeast. During the cultivation of yeast, the lowest recommended application dose of Confidor (0.025%, v/v) was added to the growth media and its influence on the mitochondria, cytosol with microsomes, and the whole yeast cells was monitored. The results show that under the stress provoked by the toxic effects of Confidor, yeast cells density significantly decreased and the percentage of metabolically disturbed cells significantly increased comparing with untreated control. Also, there was a downregulation of majority of glycolytic, gluconeogenesis, and TCA cycle enzymes (Fba1, Adh1, Hxk2, Tal1, Tdh1,Tdh3, Eno1) thus providing enough acetyl‐CoA for the lipid restructuring and accumulation mechanism since we have found the changes in the cell and mitochondrial lipid content and FA composition. This data suggest that lipids could be the molecules that orchestrate the answer of the cells in the stress response to the Confidor treatment. 相似文献