全文获取类型
收费全文 | 291篇 |
免费 | 23篇 |
专业分类
林业 | 19篇 |
农学 | 5篇 |
基础科学 | 5篇 |
58篇 | |
综合类 | 30篇 |
农作物 | 46篇 |
水产渔业 | 26篇 |
畜牧兽医 | 95篇 |
园艺 | 5篇 |
植物保护 | 25篇 |
出版年
2023年 | 9篇 |
2022年 | 11篇 |
2021年 | 30篇 |
2020年 | 16篇 |
2019年 | 17篇 |
2018年 | 21篇 |
2017年 | 16篇 |
2016年 | 15篇 |
2015年 | 8篇 |
2014年 | 20篇 |
2013年 | 15篇 |
2012年 | 21篇 |
2011年 | 22篇 |
2010年 | 15篇 |
2009年 | 11篇 |
2008年 | 14篇 |
2007年 | 9篇 |
2006年 | 10篇 |
2005年 | 6篇 |
2004年 | 7篇 |
2003年 | 5篇 |
2002年 | 9篇 |
2001年 | 1篇 |
2000年 | 1篇 |
1999年 | 1篇 |
1998年 | 1篇 |
1995年 | 1篇 |
1987年 | 1篇 |
1979年 | 1篇 |
排序方式: 共有314条查询结果,搜索用时 46 毫秒
311.
Vázquez-Carrillo G García-Lara S Salinas-Moreno Y Bergvinson DJ Palacios-Rojas N 《Plant foods for human nutrition (Dordrecht, Netherlands)》2011,66(2):203-208
The maize produced in the highlands of Mexico (>2,400 masl) is generally not accepted by the flour and masa and tortilla industry.
The objective of this work was to evaluate the grain quality and tortilla properties of maize landraces commonly grown in
the highlands of Mexico and compare them with improved germplasm (hybrids). Germplasm analysis included 11 landraces, 32 white
hybrids, and six yellow hybrids. Grain quality was analyzed for a range of physical and chemical factors, as well as for alkaline
cooking quality. Landrace grains tended to be heterogeneous in terms of size, hardness and color. All landraces had soft-intermediate
grains with an average flotation index (FI) of 61%. In contrast, hybrid grains were homogenous in size and color, and harder
than landrace grains, with a FI of 38%. Protein, free sugars, oil and phenolic content in landraces were higher than in the
hybrids. Significant correlations were found between phenolic content and tortilla color (r = −0.60; p < 0.001). Three landraces were identified as appropriate for the masa and tortilla industry, while all the hybrids evaluated
fulfilled the requirements of this industry. 相似文献
312.
313.
Gustavo J. Macchi Marcelo Pjaro María I. Militelli Natalia Radovani Lorena Rivas 《Fisheries Research》2006,80(2-3):345-349
Effects of maternal age–size and condition on oocyte dry weight were analysed for Merluccius hubbsi. Samples of mature females were collected in the Patagonian spawning area during 10 research surveys carried out between 2000 and 2005. Dry weight of 50 hydrated oocytes ranged from 0.80 to 1.90 mg. Relationships of this variable with total length and age were best described by a logarithmic model during the spawning peak. At the beginning and at the end of the reproductive season no significant relationship between these variables was observed, but a decrease in egg dry weight was detected during the spawning period. In general, young spawners (≤5-year-old) showed more variability in egg dry weight, which was associated with a reproductive season shorter than that of old females. Relative condition factor did not shows a significant relationship with oocyte dry weight, and mean values of this index were similar for different months of the spawning seasons analysed. 相似文献