全文获取类型
收费全文 | 995篇 |
免费 | 70篇 |
国内免费 | 124篇 |
专业分类
林业 | 86篇 |
农学 | 90篇 |
基础科学 | 59篇 |
139篇 | |
综合类 | 380篇 |
农作物 | 80篇 |
水产渔业 | 53篇 |
畜牧兽医 | 192篇 |
园艺 | 56篇 |
植物保护 | 54篇 |
出版年
2024年 | 11篇 |
2023年 | 24篇 |
2022年 | 43篇 |
2021年 | 52篇 |
2020年 | 57篇 |
2019年 | 45篇 |
2018年 | 40篇 |
2017年 | 42篇 |
2016年 | 42篇 |
2015年 | 48篇 |
2014年 | 44篇 |
2013年 | 63篇 |
2012年 | 85篇 |
2011年 | 83篇 |
2010年 | 57篇 |
2009年 | 49篇 |
2008年 | 50篇 |
2007年 | 41篇 |
2006年 | 37篇 |
2005年 | 28篇 |
2004年 | 25篇 |
2003年 | 38篇 |
2002年 | 41篇 |
2001年 | 43篇 |
2000年 | 33篇 |
1999年 | 14篇 |
1998年 | 7篇 |
1997年 | 15篇 |
1996年 | 7篇 |
1995年 | 1篇 |
1994年 | 7篇 |
1993年 | 1篇 |
1992年 | 5篇 |
1990年 | 2篇 |
1989年 | 2篇 |
1988年 | 3篇 |
1987年 | 1篇 |
1986年 | 1篇 |
1985年 | 1篇 |
1972年 | 1篇 |
排序方式: 共有1189条查询结果,搜索用时 15 毫秒
61.
We used nested-polymerase chain reaction (PCR) to detect Roundup Ready soybean in aquatic feeds and feeding tilapias. A template concentration of 10−10 g μL−1 DNA solution could be detected with a dilute degree of 0.01%. Most (90.6%) of the aquatic feeds containing soybean byproduct included exogenous DNA segments. We also compared genetically modified (GM) soybean with non-GM soybean diets in feeding tilapias ( Oreochromis niloticus , GIFT strain) and examined the residual fragments (254 bp) of GM soybeans. Tilapias receiving GM soybean diets had DNA fragments in different tissues and organs, indicating that exogenous GM genes were absorbed systemically and not completely degraded by the tilapia's alimentary canal. 相似文献
62.
63.
64.
65.
间接酶联免疫吸附试验检测猪生殖与呼吸系统综合征血清抗体的研究 总被引:2,自引:0,他引:2
本研究建立了检测猪生殖与呼吸系统综合征(PRRS)血清抗体的间接酶联免疫吸附试验(ELISA),其抗原包被浓度为2μg/ml,血清最适稀释度为1∶100。试验结果表明:ELISA的敏感性高于间接免疫荧光抗体试验(IFA),是一种切实可行的诊断方法。 相似文献
66.
67.
The initial stability of virgin olive oil depends on various factors, among which are the variety and the degree of fruit ripeness. The former, which genetically determines the composition of the olive and its oil, also marks, to some extent, its stability. However, oil stability changes as the olive ripens, so it is obvious that the degree of ripeness is an important factor. The oils were obtained by the Abencor system. Acidity, peroxide index, UV absorption at 232 and 270 nm, sensory analysis, fatty acid composition, tocopherols, phenolic compounds, orthodiphenolic compounds, sterols, pigments, and oxidative stability were determined, and the results were analyzed statistically. During ripening there was a decrease in all of the parameters studied except linoleic acid, Delta-5-avenasterol, and oil content, which increased. Virgin oils showed very good correlation between stability and the concentrations of total phenols, o-diphenols, tocopherols, chlorophyll pigments and carotenoids, linoleic and linolenic acids, total sterols, beta-sitosterol, and Delta-5-avenasterol. 相似文献
68.
A complete study was made of 20 Spanish herbaria and of the literature concerning the regional flora of Spain in order to define the geographical limits of the different genera of the subtribe Hordeineae found in Spain. Accordingly, several expeditions were undertaken to the greater part of the Spanish mainland and its islands in order to collect samples of wild populations of the genera Hordeum L., Taeniatherum Nevski and Hordelymus Jessen. This paper, which contains information garnered from both collection activities and the study of herbaria, describes the distribution and ecological characteristics of the habitats where populations of H. bulbosum, H. secalinum, H. murinum subsp. murinum, H. murinum subsp. leporinum, H. marinum subsp. marinum, H. marinum subsp. gussoneanum, Taeniatherum caput-medusae and Hordelymus europeus grow.The bioclimatic and geographical characteristics of the populations of the different genera and species from which samples were taken during collect ing expeditions are also described. 相似文献
69.
南京城郊蔬菜食用部位含硫量的现状:(1)一年四季的蔬菜以秋、冬季含硫量高,春、夏季低,这与秋、冬季大气中SO_2浓度升高相关。(2)不同蔬菜吸收大气中SO_2能力有明显的差别。大白菜吸SO_2能力最强(超过11g/kg),其次是莴笋、甘兰,最弱是芹菜和青蒜(低于4g/kg)。(3)不同蔬菜的食用部位硫含量是不同的,一般叶菜类蔬菜中硫含量高于果菜类蔬菜。(4)同季节,不同年份的同种蔬菜食用部位的硫含量有逐年下降趋势,表明南京城郊的大气SO_2的污染状况有明显的减轻。 相似文献
70.