Rather, coexistence requires interspecific differences in light t

Rather, coexistence requires interspecific differences in light transmissivity

through the crowns of adult trees. However, all the three mechanisms mentioned above can be interpreted within the framework of the model. Furthermore, many models of forest dynamics make use of shade tolerance as a key feature in describing successional dynamics. Despite its importance, however, shade tolerance does not have a commonly accepted quantitative definition. Selleckchem Poziotinib Here, a simple scheme is proposed where the relationship between shade tolerance, individual traits (growth and survival) and successional status is defined. This might have important implications in understanding the overall dynamics. Theoretical results have been compared with a number of studies carried out in North American forests. In particular, coexistence in beech-maple communities and the relation between shade tolerance and successional status in a beech-hemlock-birch community have been discussed. (C) 2011 Elsevier Ltd. All rights reserved.”
“The genome of Pyrococcus abyssi contains two

open reading frames encoding proteins which had been previously predicted to be DNA ligases, Pab2002 and Pab1020. We show that while the former is indeed a DNA ligase, Pab1020 had no effect on the substrate deoxyoligo- ribonucleotides tested. Instead, Pab1020 catalyzes the nucleotidylation of oligo- ribonucleotides Epigenetics inhibitor in an ATP- dependent reaction, suggesting

that it is an RNA ligase. We have solved the BMS345541 mw structure of Pab1020 in complex with the ATP analog AMPPNP by single- wavelength anomalous dispersion ( SAD), elucidating a structure with high structural similarity to the catalytic domains of two RNA ligases from the bacteriophage T4. Additional carboxy- terminal domains are also present, and one of these mediates contacts with a second protomer, which is related by noncrystallographic symmetry, generating a homodimeric structure. These C- terminal domains are terminated by short domain swaps which themselves end within 5 A of the active sites of the partner molecules. Additionally, we show that the protein is indeed capable of circularizing RNA molecules in an ATP- dependent reaction. These structural and biochemical results provide an insight into the potential physiological roles of Pab1020.”
“There is substantial evidence that evolutionary diversification can occur in allopatric conditions through reduction in the degree of phenotypic plasticity when an isolated population encounters a novel, more stable environment. Plasticity is no longer favored in the new environment, either because it carries an inherent physiological cost or because it leads to production of suboptimal phenotypes. In order to explore the role of phenotypic plasticity in sympatric diversification, we modeled the ecological and evolutionary dynamics of Escherichia coli bacteria in batch cultures.

Comments are closed.