全文获取类型
收费全文 | 305篇 |
免费 | 30篇 |
国内免费 | 1篇 |
专业分类
林业 | 17篇 |
农学 | 8篇 |
基础科学 | 1篇 |
33篇 | |
综合类 | 41篇 |
农作物 | 7篇 |
水产渔业 | 54篇 |
畜牧兽医 | 149篇 |
园艺 | 18篇 |
植物保护 | 8篇 |
出版年
2024年 | 1篇 |
2023年 | 1篇 |
2022年 | 7篇 |
2021年 | 7篇 |
2020年 | 18篇 |
2019年 | 12篇 |
2018年 | 16篇 |
2017年 | 17篇 |
2016年 | 8篇 |
2015年 | 14篇 |
2014年 | 11篇 |
2013年 | 8篇 |
2012年 | 11篇 |
2011年 | 26篇 |
2010年 | 15篇 |
2009年 | 13篇 |
2008年 | 15篇 |
2007年 | 18篇 |
2006年 | 24篇 |
2005年 | 18篇 |
2004年 | 14篇 |
2003年 | 12篇 |
2002年 | 20篇 |
2001年 | 2篇 |
2000年 | 2篇 |
1998年 | 3篇 |
1997年 | 3篇 |
1993年 | 1篇 |
1992年 | 2篇 |
1991年 | 1篇 |
1990年 | 2篇 |
1989年 | 4篇 |
1988年 | 1篇 |
1987年 | 1篇 |
1986年 | 1篇 |
1985年 | 1篇 |
1976年 | 1篇 |
1974年 | 1篇 |
1972年 | 1篇 |
1968年 | 1篇 |
1967年 | 1篇 |
1966年 | 1篇 |
排序方式: 共有336条查询结果,搜索用时 15 毫秒
61.
Fillet Quality and Processing Attributes of Postsmolt Atlantic Salmon,Salmo salar,Fed a Fishmeal‐free Diet and a Fishmeal‐based Diet in Recirculation Aquaculture Systems 下载免费PDF全文
John Davidson P. Brett Kenney Frederic T. Barrows Christopher Good Steven T. Summerfelt 《Journal of the World Aquaculture Society》2018,49(1):183-196
Many studies have evaluated the adequacy of alternate ingredient diets for Atlantic salmon, Salmo salar, mainly with focus on fish performance and health; however, comprehensive analysis of fillet quality is lacking, particularly for salmon fed these diets in recirculation aquaculture systems (RAS). To this end, a study was conducted comparing fillet quality and processing attributes of postsmolt Atlantic salmon fed a fishmeal‐free diet (FMF) versus a standard fishmeal‐based diet, in replicate RAS. Mean weight of Atlantic salmon fed both diets was 1.72 kg following the 6‐mo trial and survival was >99%. Diet did not affect (P > 0.05) processing and fillet yields, whole‐body proximate composition(fat, moisture, protein), fillet proximate composition, cook yield, fillet texture, color, or omega‐3 fatty acid fillet content, including eicosapentaenoic acid and docosahexaenoic acid levels. Whole‐body ash content was greater in salmon fed the FMF diet. The FMF diet resulted in a wild fish‐in to farmed fish‐out ratio of 0:1 per Monterey Bay Aquarium's Seafood Watch criteria due to its fishmeal‐free status and use of lipids from fishery byproduct. Overall, fillet quality and processing attributes were generally unaffected when feeding a diet devoid of fishmeal to postsmolt Atlantic salmon cultured in RAS. [Correction added on 7 September 2017, after first online publication: the P value in Abstract has been changed from “P < 0.05” to “P > 0.05”.]. 相似文献
62.
63.
Yongfen Chen Nurhan T. Dunford Jeff Edwards Brett Carver Carla Goad 《Cereal Chemistry》2009,86(1):96-99
Phytosterols (PS) lower low density lipoprotein (LDL) levels by as much as 10–14% in normal and hypercholesteromic people. High LDL levels in the blood are associated with an increased risk of coronary heart disease. Wheat germ and bran contain significant amounts of PS. The main objective of this study was to evaluate the effect of genotype and environment on PS content and composition in whole wheat grain. Protein and ash contents and mineral composition of the samples were also determined. Grain samples were collected from three cultivars, Jagger, Trego, and Intrada, grown at three locations, Alva, Balko, and Goodwell, OK in 2005. Irrigated and dryland samples were obtained from Goodwell. Total PS content and composition in the grain samples were determined using a gas chromatography system. Whole wheat grain samples varied in PS content from 202 mg/kg to 355 mg/kg. β‐Sitosterol, campesterol, and stigmasterol were the major PS compounds found in all the samples. PS exhibited a significant location‐by‐cultivar random effect (P < 0.048), indicating the presence of genotype‐by‐location interaction. Within each location, a significant cultivar effect was also observed. Protein and ash contents and mineral composition of the samples, except those collected from Goodwell‐dryland, were within the range published in the literature for other wheat cultivars. A fundamental understanding of compositional variation in wheat grain requires multi‐environment testing of genotypes, perhaps over several years. This study is a first step for achieving this goal. 相似文献
64.
Conesa Héctor M. Moradi Ahmad B. Robinson Brett H. Jiménez-Cárceles Francisco J. Schulin Rainer 《Water, air, and soil pollution》2009,201(1-4):379-388
Water, Air, & Soil Pollution - A yearlong (December 2003 to February 2005) monitoring program was undertaken for urban roadside measurement of benzene, toluene, ethyl benzene, m- and p-xylene,... 相似文献
65.
Crown rot, caused by the fungus Fusarium pseudograminearum (teleomorph Gibberella coronicola) is a major disease of wheat in the Australian grain belt. However, there is little information available on the population structure of this pathogen. We measured genetic diversity as assessed with amplified fragment length polymorphism (AFLP) analysis within and between populations of F. pseudograminearum from northeastern, south central, and southwestern regions of the Australian grain belt. Amongst the 217 isolates, 176 haplotypes were identified and grouped into two main clusters. One cluster contained isolates from populations in northeastern Australia, and the other cluster contained isolates from populations in south central and southwestern Australia. The southern populations were distinguished from the northeastern populations by higher levels of population differentiation (Gst) between them and genetic identity amongst the regional populations. We hypothesize that the F. pseudograminearum populations from northeastern and southern Australia are independent, which could result from different founding events or from geographic isolation and the accumulation of genetic differences due to genetic drift and/or selection. 相似文献
66.
67.
68.
Marina L. Leis M. Elyse Salpeter Bianca S. Bauer Dale L. Godson Bruce H. Grahn 《Veterinary ophthalmology》2017,20(4):365-371
A 15‐year‐old, neutered male, Shih Tzu cross developed progressive corneal stromal thickening and vascularization of the right eye, and 5 months later, of the left eye. Both eyes became blind due to extensive corneal opacification and were enucleated. Light microscopic examination revealed a diffuse corneal infiltrate of neoplastic mesenchymal cells, and immunohistochemistry revealed diffuse cytoplasmic vimentin immunoreactivity and variable cytoplasmic and nuclear immunoreactivity for S100 in the neoplastic cells. Transmission electron microscopy revealed desmosomes between contiguous cells, thread‐like cytoplasmic processes coated with basement membrane, extracellular bundles of collagen, and axonal degeneration consistent with features of a nerve sheath neoplasm. This is the first report of primary, bilateral corneal nerve sheath sarcoma in a canine. 相似文献
69.