全文获取类型
收费全文 | 769篇 |
免费 | 26篇 |
专业分类
林业 | 129篇 |
农学 | 4篇 |
基础科学 | 1篇 |
355篇 | |
综合类 | 74篇 |
农作物 | 31篇 |
水产渔业 | 18篇 |
畜牧兽医 | 117篇 |
园艺 | 13篇 |
植物保护 | 53篇 |
出版年
2023年 | 11篇 |
2022年 | 4篇 |
2021年 | 9篇 |
2020年 | 14篇 |
2019年 | 12篇 |
2018年 | 6篇 |
2017年 | 16篇 |
2016年 | 24篇 |
2015年 | 21篇 |
2014年 | 24篇 |
2013年 | 37篇 |
2012年 | 45篇 |
2011年 | 55篇 |
2010年 | 32篇 |
2009年 | 42篇 |
2008年 | 58篇 |
2007年 | 51篇 |
2006年 | 51篇 |
2005年 | 34篇 |
2004年 | 32篇 |
2003年 | 25篇 |
2002年 | 31篇 |
2001年 | 12篇 |
2000年 | 4篇 |
1999年 | 8篇 |
1998年 | 7篇 |
1997年 | 5篇 |
1996年 | 12篇 |
1995年 | 11篇 |
1994年 | 6篇 |
1993年 | 6篇 |
1992年 | 6篇 |
1991年 | 9篇 |
1990年 | 3篇 |
1987年 | 4篇 |
1983年 | 3篇 |
1977年 | 2篇 |
1975年 | 3篇 |
1967年 | 2篇 |
1941年 | 2篇 |
1940年 | 3篇 |
1939年 | 3篇 |
1932年 | 2篇 |
1931年 | 3篇 |
1928年 | 3篇 |
1927年 | 4篇 |
1926年 | 7篇 |
1922年 | 2篇 |
1905年 | 2篇 |
1898年 | 4篇 |
排序方式: 共有795条查询结果,搜索用时 31 毫秒
1.
2.
Till Hornbogen Mirko Glinski Rainer Zocher 《European journal of plant pathology / European Foundation for Plant Pathology》2002,108(7):713-718
The cyclic hexadepsipeptide enniatin is known as a phytopathogenic compound from Fusaria causing necrosis and wilt. The molecule consists of three alternating residues each of a branched chain amino acid and D-hydroxyisovaleric acid (D-Hiv). Enniatins are synthesized by a 347kDa multienzyme (enniatin synthetase) via a thiol template mechanism. The corresponding gene esyn1 has an open reading frame of 9393 nucleotides and harbours two modules, one responsible for D-hydroxy acid activation and one for L-amino acid activation with an integrated N-methyltransferase domain. Such methyltransferases build an homologous group among N-methyl peptide synthetases. Enniatins are synthesized by step-wise condensation of dipeptidol building blocks in an iterative manner resembling fatty acid synthesis. A key enzyme in enniatin biosynthesis is the NADPH-dependent D-2-hydroxyisovalerate dehydrogenase, that supplies enniatin synthetase with D-Hiv. Enniatins contribute to the wilt toxic character of Fusaria. Virulence was significantly reduced in F. avenaceum after disruption of the esyn1 gene. 相似文献
3.
Marc Lemmens Hermann Buerstmayr Rudolf Krska Rainer Schuhmacher Heinrich Grausgruber Peter Ruckenbauer 《European journal of plant pathology / European Foundation for Plant Pathology》2004,110(3):299-308
Fusarium head blight (FHB) is an important disease of wheat, which can result in the contamination of grains with mycotoxins such as deoxynivalenol (DON). Artificial inoculation of flowering ears with conidial suspensions is widely used to study FHB diseases. Our goal was to compare four inoculation treatments in which a conidial suspension was sprayed on flowering ears and to study the effect of the application of moisture during kernel setting and filling with a mist-irrigation system. Ten wheat genotypes were inoculated with a DON-producing Fusarium culmorum strain. Inoculation treatments varied in time of application of the inoculum (morning or evening) and in the method of controlling humidity during inoculation (bagging or mist irrigation). A wet season was simulated with a mist-irrigation system, keeping the crop canopy wet for at least 26 days after flowering. The severity of FHB symptoms (area under disease progress curve (AUDPC)), yield loss and DON contamination in the grains were determined. AUDPC data obtained with the different inoculation treatments were highly correlated (r=0.85–0.95). Mist irrigation after inoculation resulted in a higher mean disease severity, but in a overall lower toxin contamination as compared to the non-irrigated treatments. Genotypic differences in DON accumulation were present: for one wheat line toxin contamination significantly increased when irrigated, while two genotypes accumulated significantly less toxin. The closest relationships (r=0.73–0.89) between the visual symptoms and the DON content were obtained under moderate mean infection pressure. This relation between visual symptoms and the DON content deteriorated at higher infection levels. 相似文献
4.
5.
6.
Ohne Zusammenfassung 相似文献
7.
R. Georg Auerochs 《Forstwissenschaftliches Centralblatt》1940,62(12):266-283
Ohne Zusammenfassung 相似文献
8.
9.
Georg Henner Tubeuf Y. Schüpfer und Fr. Moll 《Forstwissenschaftliches Centralblatt》1928,50(11):374-384
Ohne Zusammenfassung 相似文献
10.
Ohne Zusammenfassung 相似文献