全文获取类型
收费全文 | 1367篇 |
免费 | 98篇 |
国内免费 | 184篇 |
专业分类
林业 | 130篇 |
农学 | 188篇 |
基础科学 | 72篇 |
108篇 | |
综合类 | 636篇 |
农作物 | 90篇 |
水产渔业 | 45篇 |
畜牧兽医 | 226篇 |
园艺 | 107篇 |
植物保护 | 47篇 |
出版年
2024年 | 13篇 |
2023年 | 36篇 |
2022年 | 67篇 |
2021年 | 70篇 |
2020年 | 70篇 |
2019年 | 92篇 |
2018年 | 54篇 |
2017年 | 77篇 |
2016年 | 87篇 |
2015年 | 78篇 |
2014年 | 89篇 |
2013年 | 94篇 |
2012年 | 97篇 |
2011年 | 94篇 |
2010年 | 73篇 |
2009年 | 74篇 |
2008年 | 79篇 |
2007年 | 88篇 |
2006年 | 47篇 |
2005年 | 38篇 |
2004年 | 34篇 |
2003年 | 34篇 |
2002年 | 19篇 |
2001年 | 19篇 |
2000年 | 15篇 |
1999年 | 14篇 |
1998年 | 10篇 |
1997年 | 14篇 |
1996年 | 11篇 |
1995年 | 11篇 |
1994年 | 10篇 |
1993年 | 5篇 |
1992年 | 5篇 |
1991年 | 4篇 |
1990年 | 5篇 |
1989年 | 7篇 |
1988年 | 7篇 |
1986年 | 2篇 |
1985年 | 1篇 |
1984年 | 2篇 |
1982年 | 1篇 |
1962年 | 1篇 |
1956年 | 1篇 |
排序方式: 共有1649条查询结果,搜索用时 62 毫秒
1.
48h体外干物质消化率(48h in vitro dry matter digestibility, 48h IVDMD)是衡量青贮玉米品质的重要指标。为了初步探究玉米秸秆消化率的分子遗传机理,以341份玉米自交系为材料,于2018年在沈阳和通辽种植,收获后测定秸秆48h IVDMD。利用全基因组重测序获得的6 276 612个高质量SNPs进行全基因组关联分析,共检测到153个与玉米秸秆消化率显著相关的SNPs位点(P<1.0×10-6),4个SNPs显著水平在P<1.0×10-8以上;共找到38个秸秆消化率的候选基因,主要涉及细胞生长发育、防御反应和信号转导等生物学功能。 相似文献
2.
张謇与袁世凯的交往长达三十余年,他从最初的相识荐袁、拥袁合作、相互借重到后来的分离,张謇曾幻想依靠袁世凯实现自己“实业救国”的抱负,却以失败而告终。二人分分合合,充满波折的交往过程反映了中国近代资本主义发展的艰难与坎坷。 相似文献
3.
4.
随着社会主义经济体制的逐步完善,改革的不断深化和对外开放的进一步扩大,学会在组织体制、管理模式、运行机制和活动方式等方面,还不能完全适应社会主义市场经济的要求,在综合分析学会存在诸多问题以及面临激烈竞争和严峻挑战的基础上,针对农业学会目前现状,提出了对策,以及今后努力发展的方向。 相似文献
5.
C. Jacyn Baker Daniel P. Roberts Norton M. Mock Bruce D. Whitaker Kenneth L. Deahl Andrey A. Averyanov 《Physiological and Molecular Plant Pathology》2005,67(6):1322
The plant apoplast is an important mediator of communication between the cell cytoplasm and its surroundings. Plant cell suspensions offer a convenient model system to gain insight into apoplastic physiology. Here, we describe a novel phenomenon that took place when two naturally occurring phenolics were added together to either soybean or tobacco cell suspensions. Acetosyringone (AS) and/or hydroxyacetophenone (HAP), phenolics found in the extracellular/apoplast of tobacco cells, were added to soybean or tobacco cell suspensions undergoing an oxidative burst. Individually, AS appeared to be utilized as a typical peroxidase substrate to scavenge hydrogen peroxide, while HAP was utilized at a much lower rate. However, when added together the rate of utilization of both phenolics increased and surprisingly resulted in the production of hydrogen peroxide. We have further characterized this novel phenomenon in suspension cells. This study demonstrates that certain phenolics in plants can cause co-oxidation which, as in animals, could alter the structure and bioactivity of surrounding phenolics. 相似文献
6.
7.
AIM: To investigate the effect of IH764-3 on the apoptosis of H2O2-stimulated hepatic stellate cells(HSCs) and the alteration of focal adhesion kinase (FAK). METHODS: The proliferation of HSCs was examined by direct cell count and the apoptosis was determined by Annexin-V/PI labeling, while the morphological change was observed by light microscopy and transmission electron microscopy. In addition, FAK mRNA was detected by RT-PCR. RESULTS: H2O2 promoted the proliferation of HSCs. IH764-3 induced the apoptosis of HSCs in a dose-dependent manner. The HSC apoptotic rates of different groups were 6. 35%,9. 28%,15. 10%,19. 69%,respectively, after treated with different concentrations of IH764-3 for 48 h while H2O2 group showed 2. 30%. In 30 mg/L group, the apoptosis rates were 6. 73%、10. 34%、15. 10% for the indicated time periods(12 h, 24 h, 48 h). In the presence of IH764-3, FAK mRNA decreased. The FAK mRNA reduction began at 2 h after adding IH764-3. CONCLUSION: IH764-3 induced the apoptosis of HSCs. Down-regulating the expression of FAK mRNA may be one of its mechanisms. 相似文献
8.
Buddhi Marambe Siril Wijesundara Kushan Tennakoon Dhammika Pindeniya Chandana Jayasinghe 《Weed Biology and Management》2002,2(2):79-83
The growth and development of Cuscuta chinensis Lam., and the effects of the holoparasite on the growth and yield of tomato ( Lycopersicon esculentum ), chilli ( Capsicum annuum ) and rice ( Oryza sativa ) were investigated in pot experiments under glasshouse conditions. 'Mature' and 'immature' seeds of C. chinensis showed 15 and 47% germination, respectively. The independent life duration of seedlings from 'immature' seeds was 6 days shorter than 'mature' seeds (19 days). Cuscuta chinensis formed haustoria on chilli and tomato, but not on rice seedlings. Infection with three C. chinensis seedlings per host plant reduced leaf area, dry weight, carbon and nitrogen content by 78–84% and 27–44% in tomato and chilli plants, respectively. Dry weight of C. chinensis was 0.63 g per pot in tomato, and 0.24 g per pot in chilli. Carbon and nitrogen content of C. chinensis was 0.189 and 0.028 g per pot, respectively, when grown with tomato. When it was grown with chilli, the carbon and nitrogen content of C. chinensis was 0.001 and 0.007 g per pot, respectively. Cuscuta chinensis reduced the fruit yield of tomato and chilli by 72 and 29%, respectively. The results indicated that tomato is a preferred host of C. chinensis compared with chilli, and rice is not preferred. In the host–parasite associations, C. chinensis suppressed growth and yield of chilli and tomato by diverting the elaborated products of metabolism of the hosts. 相似文献
9.
10.
AIM: To investigate the role of heat-shock protein 70(HSP70) in the protection of myocardial cells against ischemic injury.METHODS: Myocardial cells were cultured in vitro. HSP70 was induced by hyperthermia. H2O2-injured myocardial cells were divided into different groups. Flow cytometry, DNA Ladder and biochemistry methods were employed to observe the myocardial cells of different groups.RESULTS: Immunohistochemistry showed hyperthermia induced the up-regulation of HSP70 in myocardial cells. Apoptotic rate, activity analysis of cytochrome C and succinic dehydrogenase in H2O2-injuried and HSP70-protected groups were obviously different. Electron micrograph shomed hyperthermia alliviated myocardial cell injury induced by H2O2. CONCLUSION: HSP70 delays apoptosis and protects against H2O2-induced myocardial cell injury. 相似文献