全文获取类型
| 收费全文 | 244篇 |
| 免费 | 35篇 |
| 国内免费 | 1篇 |
专业分类
| 林业 | 26篇 |
| 农学 | 5篇 |
| 基础科学 | 1篇 |
| 34篇 | |
| 综合类 | 27篇 |
| 农作物 | 14篇 |
| 水产渔业 | 26篇 |
| 畜牧兽医 | 117篇 |
| 园艺 | 9篇 |
| 植物保护 | 21篇 |
出版年
| 2024年 | 1篇 |
| 2023年 | 8篇 |
| 2022年 | 8篇 |
| 2021年 | 13篇 |
| 2020年 | 17篇 |
| 2019年 | 17篇 |
| 2018年 | 11篇 |
| 2017年 | 21篇 |
| 2016年 | 13篇 |
| 2015年 | 8篇 |
| 2014年 | 11篇 |
| 2013年 | 6篇 |
| 2012年 | 21篇 |
| 2011年 | 24篇 |
| 2010年 | 13篇 |
| 2009年 | 11篇 |
| 2008年 | 16篇 |
| 2007年 | 11篇 |
| 2006年 | 13篇 |
| 2005年 | 4篇 |
| 2004年 | 12篇 |
| 2003年 | 7篇 |
| 2002年 | 2篇 |
| 2001年 | 1篇 |
| 2000年 | 2篇 |
| 1999年 | 1篇 |
| 1998年 | 1篇 |
| 1997年 | 2篇 |
| 1995年 | 1篇 |
| 1974年 | 1篇 |
| 1902年 | 1篇 |
| 1900年 | 1篇 |
| 1883年 | 1篇 |
排序方式： 共有280条查询结果，搜索用时 203 毫秒
41.
42.
Quantitative estimates of freshwater fish stocking practices by recreational angling clubs in France
Julien Cucherousset Rémy Lassus Carsten Riepe Paul Millet Frédéric Santoul Robert Arlinghaus Mathieu Buoro 《Fisheries Management and Ecology》2021,28(4):295-304
Although freshwater fish stocking is widely used by managers, quantitative assessments of stocking practices are lacking in many countries. The general objective of the present study was to determine the quantity and characteristics of fish stocking in metropolitan France. Using a survey-based approach, stocking practices for 2013 by recreational angling clubs in France were quantified, which represented the bulk of fish stocking undertaken in that year. Stocking was found to be practiced by 88.6% of angling clubs in France, representing, on average, 65% of their annual budget. Overall, 22 species were stocked, including 13 native and nine non-native species, with strong variations among species in terms of life stages and body sizes used for stocking. Using Bayesian modelling, a total biomass of 2.029 t, representing approximately 90 million fishes, was estimated to be stocked in France in 2013. In terms of biomass, the most widely stocked species were rainbow trout Oncorhynchus mykiss (Walbaum), brown trout Salmo trutta L., roach Rutilus rutilus (L.), common carp Cyprinus carpio L. and northern pike Esox lucius L. A stocking volume of approximately 60 fishes or 1.5 kg of fish biomass per angler per year seems commonplace in industrialised countries for which data are available. 相似文献
43.
Nicolas Guillerault Géraldine Loot Simon Blanchet Paul Millet Camille Musseau Julien Cucherousset Frédéric Santoul 《Fisheries Management and Ecology》2021,28(5):486-495
Stocking and electrofishing occurrence and abundance data for northern pike Esox lucius L. in >3800 km of French rivers across 7 years were compared to assess the effect of recreational fisheries stocking programmes on wild pike populations. A positive relationship was found between the additive effect of stocking and the size of the stocked pike. However, the stocking programmes implemented in France by recreational fishery managers from 2008 to 2013 increased the probability of pike occurring in the river network, without increasing abundance in well-established pike populations, because pike stocked in their early-life stages were used in most of the stocking programmes. 相似文献
44.
Use of cryopoor plasma for albumin replacement and continuous antimicrobial infusion for treatment of septic peritonitis in a dog 
下载免费PDF全文
下载免费PDF全文 45.
Estelle Noyer Barbara Lachenbruch Jana Dlouhá Catherine Collet Julien Ruelle François Ningre Meriem Fournier 《Annals of Forest Science》2017,74(2):46
Key message
The position of trees in the canopy impacts xylem structure and its inter-annual variation. After canopy release, the increase in the hydraulic conductivity of growth rings was driven by an increase in radial growth in large trees, and by both an increase in radial growth and changes in xylem structure in saplings.Context
Forest canopies are frequently subjected to disturbances that allow understory trees to access the upper canopy. The effect of canopy release on xylem anatomy has been assessed in juvenile trees and saplings, while the potential acclimation of larger trees remains poorly documented.Aims
We estimated the potential hydraulic conductivity of growth rings in large understory trees compared to overstory trees, and evaluated the responses to canopy release in large trees and in saplings.Methods
We recorded radial growth, wood density, and vessel structure in beech trees according to their position within the canopy and their size. Xylem traits were followed during 6 years after canopy release for large trees, and during 2 years for saplings. Vessel diameter and frequency as well as ring area were used to compute the potential annual ring hydraulic conductivity.Results
Large understory trees displayed lower radial growth increments and lower potential annual ring hydraulic conductivity than overstory trees. After canopy release, potential annual ring hydraulic conductivity increased in large trees, due exclusively to increased radial growth without any change in specific hydraulic conductivity. It increased in saplings due to both increased radial growth and increased specific conductivity.Conclusion
Tree size impacted xylem structure and resulted in plasticity of the potential hydraulic conductivity of the annual tree ring following canopy release.46.
47.
Dandrieux JR Timm K Roosje PJ Welle M Howard J Brühschwein A Francey T 《Journal of the American Animal Hospital Association》2011,47(2):117-121
A 7 mo old female English springer spaniel was presented with diarrhea, vomiting, apathy, and hyperthermia. Further examinations revealed generalized lymphadenomegaly consistent with sterile neutrophilic-macrophagic lymphadenitis and pulmonary involvement. Subcutaneous nodules developed one day after presentation. Histology was consistent with sterile idiopathic nodular panniculitis and vasculitis. No infectious organism was isolated. The dog responded to prednisolone, but relapsed during medication tapering. Cyclosporine had to be added to control the disease. No further relapse had occurred 98 wk after the first presentation. This is an unusual presentation of a systemic sterile neutrophilic-macrophagic lymphadenitis with nodular panniculitis and vasculitis associated with gastrointestinal and pulmonary signs. 相似文献
48.
49.
50.
Many rice-growing areas are affected by high concentrations of arsenic(As). Rice varieties that prevent As uptake and/or accumulation can mitigate As threats to human health. Genomic selection is known to facilitate rapid selection of superior genotypes for complex traits. We explored the predictive ability(PA) of genomic prediction with single-environment models, accounting or not for trait-specific markers, multi-environment models, and multi-trait and multi-environment models, using the genotypic(1600 K SNPs) and phenotypic(grain As content, grain yield and days to flowering) data of the Bengal and Assam Aus Panel. Under the base-line single-environment model, PA of up to 0.707 and 0.654 was obtained for grain yield and grain As content, respectively; the three prediction methods(Bayesian Lasso, genomic best linear unbiased prediction and reproducing kernel Hilbert spaces) were considered to perform similarly, and marker selection based on linkage disequilibrium allowed to reduce the number of SNP to 17 K, without negative effect on PA of genomic predictions. Single-environment models giving distinct weight to trait-specific markers in the genomic relationship matrix outperformed the base-line models up to 32%. Multi-environment models, accounting for genotype × environment interactions, and multi-trait and multi-environment models outperformed the base-line models by up to 47% and 61%, respectively. Among the multi-trait and multi-environment models, the Bayesian multi-output regressor stacking function obtained the highest predictive ability(0.831 for grain As) with much higher efficiency for computing time. These findings pave the way for breeding for As-tolerance in the progenies of biparental crosses involving members of the Bengal and Assam Aus Panel. Genomic prediction can also be applied to breeding for other complex traits under multiple environments. 相似文献