全文获取类型
收费全文 | 9549篇 |
免费 | 685篇 |
国内免费 | 1059篇 |
专业分类
林业 | 776篇 |
农学 | 969篇 |
基础科学 | 774篇 |
1929篇 | |
综合类 | 3418篇 |
农作物 | 449篇 |
水产渔业 | 702篇 |
畜牧兽医 | 1199篇 |
园艺 | 209篇 |
植物保护 | 868篇 |
出版年
2024年 | 63篇 |
2023年 | 206篇 |
2022年 | 380篇 |
2021年 | 444篇 |
2020年 | 471篇 |
2019年 | 519篇 |
2018年 | 315篇 |
2017年 | 531篇 |
2016年 | 639篇 |
2015年 | 516篇 |
2014年 | 499篇 |
2013年 | 672篇 |
2012年 | 815篇 |
2011年 | 735篇 |
2010年 | 534篇 |
2009年 | 530篇 |
2008年 | 421篇 |
2007年 | 478篇 |
2006年 | 381篇 |
2005年 | 306篇 |
2004年 | 257篇 |
2003年 | 190篇 |
2002年 | 189篇 |
2001年 | 152篇 |
2000年 | 134篇 |
1999年 | 120篇 |
1998年 | 98篇 |
1997年 | 86篇 |
1996年 | 97篇 |
1995年 | 73篇 |
1994年 | 67篇 |
1993年 | 76篇 |
1992年 | 54篇 |
1991年 | 46篇 |
1990年 | 41篇 |
1989年 | 49篇 |
1988年 | 24篇 |
1987年 | 18篇 |
1986年 | 15篇 |
1985年 | 12篇 |
1984年 | 5篇 |
1982年 | 3篇 |
1981年 | 6篇 |
1980年 | 4篇 |
1979年 | 8篇 |
1978年 | 4篇 |
1977年 | 4篇 |
1976年 | 2篇 |
1956年 | 1篇 |
1955年 | 1篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
XU Wan-yun WANG Hui-min WANG Wen-lun HU Meng-wei YAN Guo LI Jian-hua GAO Jian-feng 《中国畜牧兽医》2016,43(3):568-576
The specific primers were designed according to Ovis aries DRA gene sequence deposited in GenBank and the multiple cloning site of the plasmid pYD1,which was a vector used for protein surface display on Saccharomyces cerevisiae.The gene encoding DRA was amplified by PCR using the genomic RNA of Ovis aries.The 762 bp fragment was cloned and released in GenBank and registration number was KR422362.The PCR product was inserted into the yeast surface display plasmid vector pYD1 by double enzyme digestion.It was indicated that DRA gene was successfully integrated into the genome.Dot mutation was made at both ends of exon 2 in DRA gene for making restriction enzyme cutting site and design the exon 2 specific primers according to mutated Ovis aries DRA gene sequence.Sequenced exon 2 amplification products based on DNA pooling of sheep large sample template was analyzed the polymorphic loci.The polymorphic exon 2 246 bp fragment was obtained by double enzyme digestion and connected to surface display restructuring mutation carriers pYD1-DRA by the same double enzyme digestion,and then we successfully constructed yeast surface display libraries.We transformed it into Saccharomyces cerevisiae EBY100 cell.Yeast monoclone was identified by PCR amplification and sequencing,and we confirmed that DRA gene had been integrated into Saccharomyces cerevisiae genome.After galactose induced,it was detected that DRA gene library had been successfully demonstrated on the yeast cell surface under the fluorescence microscope by immunofluorescence method. 相似文献
82.
内质网是真核细胞蛋白合成和折叠的主要细胞器,当内质网内蛋白合成或折叠负担增加,引起未折叠或错误折叠蛋白增多时,可激活内质网几条特定信号通路,启动未折叠蛋白反应,这对维持细胞稳态有重要意义。越来越多研究表明,多种炎性反应疾病与内质网应激有密切联系。一方面,内质网应激引起的未折叠蛋白反应可以诱发或者抑制炎症,另一方面,炎性反应也能影响蛋白折叠,从而促进或缓解内质网应激。2型糖尿病、肿瘤和动脉粥样硬化等多种重大疾病的病理机制都涉及内质网应激与炎性反应的相互作用,对该问题的深入研究不仅能加深人们对这些疾病发病机制的理解,也有助于相关药物的研发。 相似文献
83.
84.
Jee-Hoon Lee Ik-Jae Kang A-Reum Kim You-Sun Noh Hee-Chun Chung Bong-Kyun Park 《Journal of veterinary science (Suw?n-si, Korea)》2016,17(2):253-256
This study was conducted to determine if humoral antibody response of foot-and-mouth disease (FMD) vaccine improved in 8-week-old growing pigs born to well-vaccinated sows pre-treated with 60 mg of poly-γ-glutamic acid (γ-PGA) three days before vaccination. Antibody against FMD virus serotype O was measured 0, 2, 4 and 6 weeks post-vaccination, using a PrioCHECK FMDV type O ELISA kit. The results showed that positive antibody reactions against FMDV serotype O antigen among a component of the vaccine significantly increased in response to pre-injection with γ-PGA. 相似文献
85.
Rita M. Hanel DVM DACVIM DACVECC Lee Palmer DVM MS DACVECC NREMT‐T WEMT CCRP Janice Baker DVM DACVPM Jo‐Anne Brenner BA EMT‐I EMT‐T David Dorman DVM PhD DABVT John C. Gicking DVM DACVECC Brian Gilger DVM MS DACVO DABT Cynthia M. Otto DVM PhD DACVECC DACVSMR Elizabeth Rozanski DVM DACVECC DACVIM Brian Trumpatori DVM 《Journal of Veterinary Emergency and Critical Care》2016,26(2):166-233
86.
87.
Oral infection of goats with Mycobacterium avium subsp. hominissuis (MAH) resulted in a large variety of granulomas in organized gut-associated lymphatic tissues and intestinal lymph nodes. To characterize the cellular composition of granulomas, CD4+, CD8+, γδ, B lymphocytes and plasma, CD25+, CD68+, MHC-II+, Ki67+ and endothelial cells were labeled in consecutive frozen sections by immunohistochemistry and acid fast bacilli (AFB) by Kinyoun stain. Granulomas with extensive necrosis, little mineralization and variable numbers of AFB surrounded by many CD4+ T cells, but only few epitheloid macrophages were observed in severely sick goats at 2–3 mpi. They were interpreted as exuberant immune reaction. Organized granulomas with very few AFB were seen in clinically healthy goats at 13 mpi. The necrotic cores were surrounded by a zone of granulomatous infiltrate with many epitheloid macrophages and few lymphocytes. This zone was initially wide and highly vascularized and became progressively smaller. It was enclosed by an increasing layer of connective tissue. All organized granulomas were surrounded by compartimentalized tertiary lymphoid tissue. The granulomas in experimental infection of goats with MAH reflect the heterogeneity of lesions seen in mycobacterial infections of humans and ruminants and are therefore valuable for comparative research. 相似文献
88.
89.
90.