全文获取类型
收费全文 | 581篇 |
免费 | 46篇 |
专业分类
林业 | 63篇 |
农学 | 32篇 |
基础科学 | 1篇 |
135篇 | |
综合类 | 28篇 |
农作物 | 35篇 |
水产渔业 | 55篇 |
畜牧兽医 | 204篇 |
园艺 | 9篇 |
植物保护 | 65篇 |
出版年
2023年 | 17篇 |
2022年 | 12篇 |
2021年 | 25篇 |
2020年 | 30篇 |
2019年 | 39篇 |
2018年 | 33篇 |
2017年 | 41篇 |
2016年 | 44篇 |
2015年 | 22篇 |
2014年 | 28篇 |
2013年 | 43篇 |
2012年 | 36篇 |
2011年 | 57篇 |
2010年 | 22篇 |
2009年 | 19篇 |
2008年 | 27篇 |
2007年 | 30篇 |
2006年 | 17篇 |
2005年 | 15篇 |
2004年 | 15篇 |
2003年 | 16篇 |
2002年 | 11篇 |
2001年 | 3篇 |
2000年 | 7篇 |
1999年 | 2篇 |
1998年 | 1篇 |
1995年 | 3篇 |
1994年 | 2篇 |
1993年 | 1篇 |
1990年 | 1篇 |
1985年 | 1篇 |
1978年 | 2篇 |
1976年 | 1篇 |
1975年 | 1篇 |
1972年 | 1篇 |
1970年 | 1篇 |
1964年 | 1篇 |
排序方式: 共有627条查询结果,搜索用时 340 毫秒
71.
Comparison of serological assays for the diagnosis of canine visceral leishmaniasis in animals presenting different clinical manifestations 总被引:1,自引:0,他引:1
Ferreira Ede C de Lana M Carneiro M Reis AB Paes DV da Silva ES Schallig H Gontijo CM 《Veterinary parasitology》2007,146(3-4):235-241
Three serological methods, indirect fluorescent immunoassay (IFI), enzyme-linked immunosorbent assay (ELISA) and direct agglutination test (DAT) that are commonly employed in the diagnosis of canine visceral leishmaniasis (CVL), have been assessed. A total of 234 domestic dogs, drawn from an area in the municipality of Belo Horizonte, Minas Gerais, Brazil, endemic for visceral leishmaniasis, were submitted to clinical and parasitological examinations and serological assay. Sera collected from confirmed non-infected dogs (n=20), and from dogs with other parasitic diseases including Trypanosoma cruzi (n=7), Leishmania braziliensis (n=5), Toxoplasma gondii (n=5) and Ehrlichia canis (n=3), were also included in the study. IFI presented a lower sensitivity (72%) than ELISA (95%), although the specificities of these assays were low (52 and 64%, respectively) and both exhibited cross-reactivity with sera from dogs infected with T. cruzi, L. braziliensis and E. canis. In contrast, DAT exhibited a high sensitivity (93%) and a high specificity (95%) and cross-reacted with only one serum sample derived from an E. canis-infected dog. The reproducibilities of the ELISA and DAT assays were excellent, whilst that of IFI was considered to be acceptable. The results produced by ELISA and DAT were in complete agreement, those between ELISA and IFI were at an acceptable level of agreement, whilst the concurrence between the IFI and DAT results were either acceptable or poor depending on the clinical conditions of the group of dogs examined. Since there is no readily accessible method for the diagnosis of CVL that offers 100% specificity and sensitivity, the choice of technique employed must depend on the aim of the investigation. 相似文献
72.
Reis JL Kanamura CT Machado GM França RO Borges JR Santos RL 《Veterinary pathology》2007,44(4):504-507
A 12-year-old Simmental cow was presented with a moderately firm irregular whitish mass of approximately 5 cm in diameter, occupying the right orbit. Microscopically, a poorly differentiated neoplasm was observed. The immunohistochemical panel included cytokeratins, vimentin, epithelial membrane antigen, Factor VIII, CD34, Mart-1, Melan A, smooth muscle actin, desmin, chromogranin, neuron-specific enolase, S-100 protein, and MIB-1. The neoplasm was negative for all of them, with the exception of vimentin and S-100 protein. Transmission electron microscopy revealed abundant desmosomes. These findings support the diagnosis of orbital (retrobulbar) meningioma. 相似文献
73.
74.
José Maria Villela Pádua Kaio Olímpio Das Graças Dias Maria Marta Pastina João Cândido de Souza Valéria Aparecida Vieira Queiroz Rodrigo Veras da Costa Maria Beatriz Pereira da Silva Carlos Alexandre Gomes Ribeiro Claudia Teixeira Guimarães Salvador Alejandro Gezan Lauro José Moreira Guimarães 《Euphytica》2016,211(3):277-285
75.
76.
77.
78.
79.
80.
Silva TM Câmara CA Agra Mde F de Carvalho MG Frana MT Brandoline SV da Silva Paschoal L Braz-Filho R 《Fitoterapia》2006,77(6):449-452
Seven species of Solanum were screened for their molluscicidal properties against Biomphalaria glabrata, the intermediated host of Schistosoma mansoni, Solanum agrarium, S. jabrense, S. melissarum, S. megalonyx, S. paludosum, S. paraibanum and S. stipulaceum. Four extracts showed molluscicidal activity with LC(50) from 22 to 56 microg/ml. 相似文献