Authors:J. M. Greenwood-Lee, P. D. Taylor, and D. Haig
We develop a general inclusive fitness model for genetic evolution at an imprinted locus – one at which selection is allowed to act conditionally upon parental origin of the gene. In many cases of interest, such genes affect the fitness of relatives, particularly sibs. We formulate a matrilineal and patrilineal inclusive fitness and show that these can be used to describe the dynamics of change in mean expression levels. We classify and analyze the stability of equilibrium points and apply our results to some examples that have appeared in the literature, multiple paternity of a female's offspring, the “ovarian time-bomb,” and loss-of-function mutations.
Authors:J. Bystricka, J. Musilova, J. Tomas, J. Noskovic, E. Dadákova, and P. Kavalcova
Onion bulbs (Allium cepa L.) are good sources of flavonoids. The aim of this study was to analyse the changes in dynamics of quercetin formation in three varieties of onions (white, yellow, and red) during the vegetation period. Quercetin content was determined after acid hydrolysis (1.2 M HCl in 50% aqueous methanol) by high-performance liquid chromatography (HPLC). The content of total phenolics was determined using Folin-Ciocalteu reagent (FCR) according to LACHMAN and co-workers (2003). The content of polyphenols in onion ranged from 2893 to 6052 mg kg–1 and the content of quercetin ranged from 52.44 to 280.72 mg kg–1 in fresh matter. The highest content of polyphenols and quercetin was found in the red variety. According to statistical analysis the dynamic of quercetin formation in all cultivars had statistically moderate (P<0.05) increasing tendency. Increasing content of polyphenols was accompanied with slight increase of quercetin, but the differences remained insignificant (P<0.05).
Authors:A. Kyritsis, A. Spanoudaki, C. Pandis, L. Hartmann, R. Pelster, N. Shinyashiki, J. C. Rodríguez Hernández, J. L. Gómez Ribelles, M. Monleón Pradas, and P. Pissis
/diffusion, thermal transitions, dynamics and properties of biocompatible hydrogels based on poly(hydroxyethyl acrylate), PHEA, both homopolymers and copolymers and IPNs with a hydrophobic acrylate or methacrylate [ 3 – 7 ]. In recent papers we focused on homogeneous
Sequeira, R. and Dixon, A. F. G. (1997): Population dynamics of tree-dwelling aphids: the importance of seasonality and time scale. Ecology 78, 2603-2610.
Population dynamics of tree-dwelling aphids: the importance of seasonality