全文获取类型
收费全文 | 612篇 |
免费 | 31篇 |
专业分类
林业 | 54篇 |
农学 | 69篇 |
基础科学 | 2篇 |
108篇 | |
综合类 | 34篇 |
农作物 | 69篇 |
水产渔业 | 90篇 |
畜牧兽医 | 158篇 |
园艺 | 17篇 |
植物保护 | 42篇 |
出版年
2024年 | 2篇 |
2023年 | 9篇 |
2022年 | 7篇 |
2021年 | 8篇 |
2020年 | 17篇 |
2019年 | 20篇 |
2018年 | 29篇 |
2017年 | 31篇 |
2016年 | 33篇 |
2015年 | 17篇 |
2014年 | 29篇 |
2013年 | 71篇 |
2012年 | 43篇 |
2011年 | 37篇 |
2010年 | 39篇 |
2009年 | 28篇 |
2008年 | 39篇 |
2007年 | 20篇 |
2006年 | 15篇 |
2005年 | 16篇 |
2004年 | 10篇 |
2003年 | 4篇 |
2002年 | 7篇 |
2001年 | 15篇 |
2000年 | 6篇 |
1999年 | 7篇 |
1998年 | 3篇 |
1997年 | 4篇 |
1996年 | 3篇 |
1995年 | 2篇 |
1994年 | 3篇 |
1993年 | 2篇 |
1992年 | 2篇 |
1989年 | 2篇 |
1987年 | 5篇 |
1986年 | 3篇 |
1985年 | 4篇 |
1984年 | 2篇 |
1983年 | 3篇 |
1979年 | 3篇 |
1978年 | 2篇 |
1976年 | 2篇 |
1972年 | 2篇 |
1971年 | 4篇 |
1970年 | 5篇 |
1968年 | 7篇 |
1967年 | 4篇 |
1966年 | 6篇 |
1965年 | 2篇 |
1865年 | 1篇 |
排序方式: 共有643条查询结果,搜索用时 15 毫秒
641.
A Non‐Reciprocal Autosomal Translocation 64,XX,t(4;10)(q21;p15) in an Arabian Mare with Repeated Early Embryonic Loss
下载免费PDF全文
![点击此处可从《Reproduction in domestic animals》网站下载免费的PDF全文](/ch/ext_images/free.gif)
S Ghosh PJ Das F Avila BK Thwaits BP Chowdhary T Raudsepp 《Reproduction in domestic animals》2016,51(1):171-174
Balanced autosomal translocations are a known cause for repeated early embryonic loss (REEL) in horses. In most cases, carriers of such translocations are phenotypically normal, but the chromosomal aberration negatively affects gametogenesis giving rise to both genetically balanced and unbalanced gametes. The latter, if involved in fertilization, result in REEL, whereas gametes with the balanced form of translocation will pass the defect into next generation. Therefore, in order to reduce the incidence of REEL, identification of translocation carriers is critical. Here, we report about a phenotypically normal 3‐year‐old Arabian mare that had repeated resorption of conceptuses prior to day 45 of gestation and was diagnosed with REEL. Conventional and molecular cytogenetic analyses revealed that the mare had normal chromosome number 64,XX but carried a non‐mosaic and non‐reciprocal autosomal translocation t(4;10)(q21;p15). This is a novel translocation described in horses with REEL and the first such report in Arabians. Previous cases of REEL due to autosomal translocations have exclusively involved Thoroughbreds. The findings underscore the importance of routine cytogenetic screening of breeding animals. 相似文献
642.
Partha Sarathi Ghorai Sunanda Biswas Tapan Jyoti Purakayastha Nayan Ahmed Tapas Kumar Das Radha Prasanna Bharat Hanamant Gawade Kallol Bhattacharyya Kanchan Sinha Priya Singh Sujit Das 《Soil Use and Management》2023,39(1):503-520
Deterioration of soil quality under resource-intensive modern agriculture in the face of global climate change poses a huge risk to food security. Because of the complex nature, estimators of soil quality often rely upon a limited set of soil attributes, along with statistical data reduction techniques, for developing quality indices, whilst overlooking biological aspects and regional climatic variability. This study screened the most suitable soil quality indexing approaches for a rice-oilseed-based cropping system in the lower Indo-Gangetic plains (IGP). For this, surface soil samples (0–15 cm) were collected from an ongoing long-term fertilizer experiment with a rice-mustard-sesame cropping system in the IGP. The following treatments were assessed for their effect on soil quality: T1-control, T2-NPK (recommended NPK doses), T3-NPKG (NPK + in situ green manuring), T4-NPKGB (NPK + in situ green manuring + biofertilizer) and T5-NPKF (NPK + farm yard manure FYM). We found that total organic carbon (TOC), β-glucosidase, CaCl2 extractable S, alkaline KMnO4 oxidizable N, activity of urease, amidase enzyme and mean weight diameter (MWD) were sensitive key indicators of soil quality. The NPKF treatment maintained the highest soil quality status (0.80–0.91), both under productivity and environmental protection goals, owing to the availability of decomposable carbon. Regression analysis showed a better agreement of equivalent rice yield with expert opinion (EO; R2 = 0.89) than principal component analysis (PCA; R2 = 0.76). Finally, we found that the expert opinion approach with the nonlinear scoring function was the best tool for soil quality assessment of the region. 相似文献
643.