|
|
|
| Registros recuperados: 13.807 | |
|
| |
|
| |
|
| |
|
| |
|
|
| Diniz-Filho,José Alexandre F.; Santos,Thiago; Rangel,Thiago Fernando; Bini,Luis Mauricio. |
| Several metrics have been developed for estimating phylogenetic signal in comparative data. These may be important both in guiding future studies on correlated evolution and for inferring broad-scale evolutionary and ecological processes (e.g., phylogenetic niche conservatism). Notwithstanding, the validity of some of these metrics is under debate, especially after the development of more sophisticated model-based approaches that estimate departure from particular evolutionary models (i.e., Brownian motion). Here, two of these model-based metrics (Blomberg's K-statistics and Pagel's λ) are compared with three statistical approaches [Moran's I autocorrelation coefficient, coefficients of determination from the autoregressive method (ARM), and phylogenetic... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Autocorrelation; Blomberg's K; Pagel's lambda; Autoregressive method; Moran's I; Phylogenetic eigenvector regression. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572012000400019 |
| |
|
|
| Kochakinezhad, Hamed; Peyvast, Gholam-Ali; Kashi, Abdol-Karim; Olfati, Jamal-Ali; Asadi, A.. |
| Tomato (Lycopersicon esculentum Mill.) is one of the most popular and versatile vegetables in the world, and organic production with a high yield and desirable quality is a target of many producers. The effect of four different fertilizers (chemical, municipal solid waste compost, cattle manure, and spent mushroom compost) on four commercial tomato cultivars (Redstone, Flat, Peto Pride and Chief) was assessed in this research. The highest yield was obtained with the Chief cultivar when fertilized with chemical fertilizer and the lowest value was obtained with Peto Pride fertilized with 20 tonnes per hectare (t/ha) of cow manure. The difference between the two classes of fertilizers (organic and chemical) was not very high so that organic fertilizers are... |
| Tipo: Journal paper |
Palavras-chave: "Organics" in general. |
| Ano: 2012 |
URL: http://orgprints.org/24273/7/24273.pdf |
| |
|
| |
|
| |
|
|
| Mandal, Maitreyi; Lagerkvist, Carl Johan. |
| Mean-Variance theory of portfolio construction is still regarded as the main building block of modern portfolio theory. However, many authors have suggested that the mean-variance criterion, conceived by Markowitz (1952), is not optimal for asset allocation, because the investor expected utility function is better proxied by a function that uses higher moments and because returns are distributed in a non-Normal way, being asymmetric and/or leptokurtic, so the mean-variance criterion cannot correctly proxy the expected utility with non-Normal returns. Copulas are a very useful tool to deal with non standard multivariate distribution. Value at Risk (VaR) and Conditional Value at Risk (CVaR) have emerged as a golden measure of risk in recent times. Though... |
| Tipo: Presentation |
Palavras-chave: Portfolio Choice; Downside Risk Protection; Value at risk; Copula; Agricultural Finance; Risk and Uncertainty; C52; G11; Q14. |
| Ano: 2012 |
URL: http://purl.umn.edu/124387 |
| |
|
| |
|
| |
|
| |
|
| |
|
| |
|
| |
|
|
| Hilbeck, Angelika; Mc Millan, Johanna M.; Meier, Matthias; Humbel, Anna; Schläpfer-Miller, Juanita; Trtikova, Miluse. |
| Background: In 2008/2009, Schmidt and colleagues published a study reporting lethal effects of the microbial Bt toxins Cry1Ab and Cry3Bb on the coccinellid biological control organisms Adalia bipunctata. Based on this study, in concert with over 30 other publications, Mon810 cultivation was banned in Germany in 2009. This triggered two commentaries and one experimental study all published in the journal ‘Transgenic Research’ that question the scientific basis of the German ban or claim to disprove the adverse effects of the Bt toxins on A. bipunctata reported by Schmidt and colleagues, respectively. This study was undertaken to investigate the underlying reasons for the different outcomes and rebuts the criticism voiced by the two other commentaries.... |
| Tipo: Journal paper |
Palavras-chave: Research methodology and philosophy; Environmental aspects. |
| Ano: 2012 |
URL: http://orgprints.org/23046/1/Hilbeck-etal-2012-EnvironSciEu-24-10-p1-12.pdf |
| |
|
|
| Holinger, Mirjam. |
| Feeding of concentrates to ruminants in organic farming in Switzerland is questionable due to several aspects: (i) suitability for ruminants, (ii) land use change caused by soy cultivation, (ii) organic principles of closed circuits, and (iv) ethical considerations when ruminants directly compete with human nutrition. In the past decades breeding strategies in the dairy sector focused primarily on milk production which led to increased energy requirements. A reduction of concentrates in the ration may thus lead to a more negative energy balance and may be detrimental for health and fertility. Published genotype x feeding system interactions suggest that different breeds, strains or genotypes react differently to different levels of feeding. The aim of... |
| Tipo: Thesis |
Palavras-chave: Dairy cattle; Feeding and growth; Breeding and genetics. |
| Ano: 2012 |
URL: http://orgprints.org/25083/1/Masterarbeit_MirjamHolinger.pdf |
| |
|
| |
|
| |
| Registros recuperados: 13.807 | |
|
|
|
