全文获取类型
收费全文 | 1276篇 |
免费 | 80篇 |
国内免费 | 1篇 |
专业分类
林业 | 70篇 |
农学 | 28篇 |
基础科学 | 7篇 |
155篇 | |
综合类 | 274篇 |
农作物 | 59篇 |
水产渔业 | 126篇 |
畜牧兽医 | 518篇 |
园艺 | 42篇 |
植物保护 | 78篇 |
出版年
2024年 | 3篇 |
2023年 | 22篇 |
2022年 | 32篇 |
2021年 | 39篇 |
2020年 | 57篇 |
2019年 | 59篇 |
2018年 | 35篇 |
2017年 | 47篇 |
2016年 | 33篇 |
2015年 | 31篇 |
2014年 | 41篇 |
2013年 | 54篇 |
2012年 | 103篇 |
2011年 | 95篇 |
2010年 | 57篇 |
2009年 | 49篇 |
2008年 | 76篇 |
2007年 | 79篇 |
2006年 | 81篇 |
2005年 | 82篇 |
2004年 | 70篇 |
2003年 | 57篇 |
2002年 | 53篇 |
2001年 | 9篇 |
2000年 | 5篇 |
1999年 | 11篇 |
1998年 | 12篇 |
1997年 | 3篇 |
1996年 | 10篇 |
1995年 | 3篇 |
1994年 | 3篇 |
1993年 | 11篇 |
1991年 | 3篇 |
1990年 | 3篇 |
1989年 | 3篇 |
1988年 | 3篇 |
1987年 | 1篇 |
1986年 | 4篇 |
1985年 | 3篇 |
1984年 | 2篇 |
1983年 | 2篇 |
1982年 | 2篇 |
1981年 | 2篇 |
1980年 | 1篇 |
1977年 | 1篇 |
1976年 | 1篇 |
1975年 | 3篇 |
1972年 | 1篇 |
排序方式: 共有1357条查询结果,搜索用时 31 毫秒
141.
KV Prasad BH Song C Olson-Manning JT Anderson CR Lee ME Schranz AJ Windsor MJ Clauss AJ Manzaneda I Naqvi M Reichelt J Gershenzon SG Rupasinghe MA Schuler T Mitchell-Olds 《Science (New York, N.Y.)》2012,337(6098):1081-1084
Identification of the causal genes that control complex trait variation remains challenging, limiting our appreciation of the evolutionary processes that influence polymorphisms in nature. We cloned a quantitative trait locus that controls plant defensive chemistry, damage by insect herbivores, survival, and reproduction in the natural environments where this polymorphism evolved. These ecological effects are driven by duplications in the BCMA (branched-chain methionine allocation) loci controlling this variation and by two selectively favored amino acid changes in the glucosinolate-biosynthetic cytochrome P450 proteins that they encode. These changes cause a gain of novel enzyme function, modulated by allelic differences in catalytic rate and gene copy number. Ecological interactions in diverse environments likely contribute to the widespread polymorphism of this biochemical function. 相似文献
142.
Price DC Chan CX Yoon HS Yang EC Qiu H Weber AP Schwacke R Gross J Blouin NA Lane C Reyes-Prieto A Durnford DG Neilson JA Lang BF Burger G Steiner JM Löffelhardt W Meuser JE Posewitz MC Ball S Arias MC Henrissat B Coutinho PM Rensing SA Symeonidi A Doddapaneni H Green BR Rajah VD Boore J Bhattacharya D 《Science (New York, N.Y.)》2012,335(6070):843-847
143.
144.
Shapiro BJ Friedman J Cordero OX Preheim SP Timberlake SC Szabó G Polz MF Alm EJ 《Science (New York, N.Y.)》2012,336(6077):48-51
Genetic exchange is common among bacteria, but its effect on population diversity during ecological differentiation remains controversial. A fundamental question is whether advantageous mutations lead to selection of clonal genomes or, as in sexual eukaryotes, sweep through populations on their own. Here, we show that in two recently diverged populations of ocean bacteria, ecological differentiation has occurred akin to a sexual mechanism: A few genome regions have swept through subpopulations in a habitat-specific manner, accompanied by gradual separation of gene pools as evidenced by increased habitat specificity of the most recent recombinations. These findings reconcile previous, seemingly contradictory empirical observations of the genetic structure of bacterial populations and point to a more unified process of differentiation in bacteria and sexual eukaryotes than previously thought. 相似文献
145.
146.
147.
148.
149.
150.
Lynen G Yrjö-Koskinen AE Bakuname C Di Giulio G Mlinga N Khama I Hanks J Taylor NM James AD McKeever D Peters AR Rushton J 《Tropical animal health and production》2012,44(3):567-572
East Coast fever (ECF) causes considerable mortality and production losses in the Tanzania smallholder dairy sector and limits the introduction of improved dairy breeds in areas where the disease is present. The infection and treatment method (ITM) was adopted by smallholder dairy farms for ECF immunisation in Hanang and Handeni districts of Tanzania. This study recorded incidence rates for ECF and other tick-borne diseases (TBDs) for ECF-immunised and non-immunised cattle between 1997 and 2000. Approximately 80% of smallholder households from both sites (n?=?167) participated in this longitudinal study, with immunisations carried out at the request of the livestock owners. Efficacy of ITM for preventing ECF cases in these crossbred dairy cattle was estimated at 97.6%, while that for preventing ECF deaths was 97.9%. One percent of the cattle developed clinical ECF as a result of immunisation. Since ECF immunisation permits a reduction in acaricide use, an increase in other TBDs is a potential concern. Sixty-three percent of farmers continued to use the same acaricide after immunisation, with 80% of these reducing the frequency of applications. Overall, 78% of farmers increased the acaricide application interval after immunisation beyond that recommended by the manufacturer, resulting in annual savings in the region of USD 4.77 per animal. No statistical difference was observed between the immunised and non-immunised animals in the incidence of non-ECF TBDs. However, immunised animals that succumbed to these diseases showed fewer case fatalities. ITM would therefore appear to be a suitable method for ECF control in Tanzania's smallholder dairy sector. 相似文献