全文获取类型
收费全文 | 6431篇 |
免费 | 322篇 |
国内免费 | 710篇 |
专业分类
林业 | 765篇 |
农学 | 1044篇 |
基础科学 | 584篇 |
1166篇 | |
综合类 | 1806篇 |
农作物 | 272篇 |
水产渔业 | 244篇 |
畜牧兽医 | 831篇 |
园艺 | 238篇 |
植物保护 | 513篇 |
出版年
2024年 | 13篇 |
2023年 | 71篇 |
2022年 | 167篇 |
2021年 | 261篇 |
2020年 | 216篇 |
2019年 | 225篇 |
2018年 | 155篇 |
2017年 | 205篇 |
2016年 | 220篇 |
2015年 | 290篇 |
2014年 | 270篇 |
2013年 | 309篇 |
2012年 | 431篇 |
2011年 | 396篇 |
2010年 | 424篇 |
2009年 | 359篇 |
2008年 | 385篇 |
2007年 | 352篇 |
2006年 | 344篇 |
2005年 | 353篇 |
2004年 | 148篇 |
2003年 | 176篇 |
2002年 | 89篇 |
2001年 | 119篇 |
2000年 | 150篇 |
1999年 | 202篇 |
1998年 | 175篇 |
1997年 | 145篇 |
1996年 | 136篇 |
1995年 | 104篇 |
1994年 | 101篇 |
1993年 | 86篇 |
1992年 | 88篇 |
1991年 | 58篇 |
1990年 | 71篇 |
1989年 | 50篇 |
1988年 | 44篇 |
1987年 | 26篇 |
1986年 | 14篇 |
1985年 | 5篇 |
1984年 | 5篇 |
1983年 | 9篇 |
1982年 | 6篇 |
1981年 | 6篇 |
1980年 | 3篇 |
1962年 | 1篇 |
排序方式: 共有7463条查询结果,搜索用时 15 毫秒
991.
992.
993.
Qiong Wu Mengji Cao Huanan Su Sagheer Atta Fangyun Yang Xuefeng Wang Changyong Zhou 《European journal of plant pathology / European Foundation for Plant Pathology》2014,139(1):13-17
CVd-I-LSS (low sequence similarity), a variant of Citrus bent leaf viroid (CBLVd), was first discovered in Japan, and its distribution is currently limited to Japan and Iran. In the present study, seven CVd-I-LSS isolates were detected from different citrus hosts (Citrus sinensis, C. reticulata and C. limettioides) in Pakistan and China. Genetic diversity analysis of 49 cDNAs of CVd-I-LSS isolates showed that the Pakistan population was more diverse than that tested from Japan or China. Phylogenetic analysis clustered the predominant sequences examined into three main clades. Only sequences from the Pakistan isolates were found in all three clades, suggesting Pakistan may be the original source of CVd-I-LSS. Cultivar import records and the close phylogenetic relationship found between CVd-I-LSS from China and Japan suggested that the viroid isolated from China might have originated from Japan. 相似文献
994.
995.
应用胶体金免疫层析技术研制了黄瓜细菌性白枯病病菌[Pseudomonas viridiflava (Burkholder 1930) Dowson1939]检测试纸条.采用柠檬酸三钠法还原氯金酸制备胶体金,标记黄瓜细菌性白枯病病菌多克隆抗体,将金标抗体喷涂在结合垫上,将黄瓜细菌性白枯病病菌抗体和羊抗兔二抗包被在硝酸纤维素膜上作检测线和质控线,组装制成黄瓜细菌性白枯病病菌检测试纸条.用试纸条检测黄瓜细菌性白枯病病菌的结果表明,制备的试纸条特异性好,与其他常见植物病原细菌等无交叉反应,对黄瓜叶片中黄瓜细菌性白枯病病菌的最低检测限为106 cfu/mL,能在5~15 min内快速检测出黄瓜细菌性白枯病病菌,适合田间现场快速检测黄瓜细菌性白枯病病菌. 相似文献
996.
Ke Cao Lirong Wang Pei Zhao Gengrui Zhu Weichao Fang Changwen Chen Xinwei Wang 《Plant Breeding》2014,133(4):530-535
Root‐knot nematode disease, caused by Meloidogyne species, is an important soil‐borne disease of peach (Prunus persica L.) worldwide. To identify a major locus of genetic resistance to M. incognita, PkMi, in a wild peach species, we reconstructed a linkage group in a BC1 population of 187 lines using resistance gene analogue markers surrounding the PkMi locus. A resistance gene analogue marker, ppa021062m, co‐segregated with the PkMi locus and was therefore considered a strong candidate for PkMi. Phylogenetic analysis of the deduced protein sequences of ppa021062m, together with the other seven genes for nematode resistance, allowed ppa021062m to be assigned to the Toll/Interleukin1 Receptor‐Nucleotide Binding Site‐Leucine Rich Repeat class, similar to Ma in myrobalan plum (P. cerasifera). Comparative analysis of the candidate gene sequence in four genotypes that had different levels of resistance to root‐knot nematode disease showed that most non‐synonymous SNPs in the genic region were distributed in the TIR and NBS motifs. This study enhances our understanding of the genetic and molecular control of resistance to root‐knot nematode disease in peach. 相似文献
997.
998.
999.
1000.