Autor: Wilson, M. L. - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Attributes of dispersing meadow voles in open-grid populations
Autorzy:: Rose, R. K.
Dueser, R. D.
Wilson, M. L.
Powiązania:: Acta Theriologica
Opis:: Dispersal was investigated in two open-grid populations of meadow voles, Microtus pennsylvanicus (Ord, 1815) in central Virginia (U.S.A.) from November 1974 to April 1978. "Dispersal" was defined as immigration onto open, occupied population grids.
Dostawca treści:: RCIN - Repozytorium Cyfrowe Instytutów Naukowych

Książka

na półce

Skocz do pozycji: 2.

Tytuł:: Evolution of glucuronoxylan side chain variability in vascular plants and the compensatory adaptations of cell wall-degrading hydrolases
Autorzy:: Yu, Li
Łyczakowski, Jan
Wilson, Louis F. L.
Yu, Xiaolan
Dupree, Paul
Krogh, Kristian B. R. M.
Wurman-Rodrich, Joel
Terrett, Oliver M.
Opis:: Polysaccharide structural complexity not only influences cell wall strength and extensibility but also hinders pathogenic and biotechnological attempts to saccharify the wall. In certain species and tissues, glucuronic acid side groups on xylan exhibit arabinopyranose or galactose decorations whose genetic and evolutionary basis is completely unknown, impeding efforts to understand their function and engineer wall digestibility. Genetics and polysaccharide profiling were used to identify the responsible loci in Arabidopsis and Eucalyptus from proposed candidates, while phylogenies uncovered a shared evolutionary origin. GH30-family endo-glucuronoxylanase activities were analysed by electrophoresis, and their differing specificities were rationalised by phylogeny and structural analysis. The newly identified xylan arabinopyranosyltransferases comprise an overlooked subfamily in the GT47-A family of Golgi glycosyltransferases, previously assumed to comprise mainly xyloglucan galactosyltransferases, highlighting an unanticipated adaptation of both donor and acceptor specificities. Further neofunctionalisation has produced a Myrtaceae-specific xylan galactosyltransferase. Simultaneously, GH30 endo-glucuronoxylanases have convergently adapted to overcome these decorations, suggesting a role for these structures in defence. The differential expression of glucuronoxylan-modifying genes across Eucalyptus tissues, however, hints at further functions. Our results demonstrate the rapid adaptability of biosynthetic and degradative carbohydrate-active enzyme activities, providing insight into plant-pathogen interactions and facilitating plant cell wall biotechnological utilisation.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

Artykuł

na półce

Skocz do pozycji: 3.

Tytuł:: Electronic Properties of InAs/GaAs Self-Assembled Quantum Dot Structures and Devices Studied by Photocurrent Spectroscopy
Autorzy:: Mowbray, D. J.
Fry, P. W.
Skolnick, M. S.
Itskevich, I. E.
Harris, L.
Ashmore, A. D.
Finley, J. J.
Wilson, L. R.
Schumacher, K. L.
Barker, J. A.
O'Reilly, E. P.
Al-Khafaji, M.
Cullis, A. G.
Hopkinson, M.
Clark, J. C.
Hill, G.
Tematy:: 78.66.Fd
73.61.Ey
73.50.Pz
42.55.Px; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/2014190.pdf Link otwiera się w nowym oknie
Opis:: The power of photocurrent spectroscopy to study the electronic properties of InAs/GaAs self-assembled quantum dots is described. From comparison of results from different samples it is shown that photocurrent provides a direct means to measure absorption spectra of quantum dots. Studies in high electric field enable the electron-hole vertical alignment to be determined. Most surprisingly this is found to be opposite to that predicted by all recent predictions. Comparison with theory shows that this can only be explained if the dots contain significant amounts of gallium, and have a severely truncated shape. The nature of the ground and excited state transitions, carrier escape mechanisms from dots, in-plane wave function anisotropies and the modal gain of a quantum dot laser are determined.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 4.

Tytuł:: Eudicot primary cell wall glucomannan is related in synthesis, structure, and function to xyloglucan
Autorzy:: Krogh, Kristian B. R. M.
Ishida,Konan
Stott, Katherine
Wightman,Raymond
Terrett, Oliver M.
Temple, Henry
Yoshimi, Yoshihisa
Dupree, Ray
Yu, Li
Łyczakowski, Jan
Yu, Xiaolan
Charalambous, Stephan
Dupree, Paul
Brown, Steven P.
Wurman-Rodrich, Joel
Wilson, Louis F. L.
Cresswell, Rosalie
Opis:: Hemicellulose polysaccharides influence assembly and properties of the plant primary cell wall (PCW), perhaps by interacting with cellulose to affect the deposition and bundling of cellulose fibrils. However, the functional differences between plant cell wall hemicelluloses such as glucomannan, xylan, and xyloglucan (XyG) remain unclear. As the most abundant hemicellulose, XyG is considered important in eudicot PCWs, but plants devoid of XyG show relatively mild phenotypes. We report here that a patterned β-galactoglucomannan (β-GGM) is widespread in eudicot PCWs and shows remarkable similarities to XyG. The sugar linkages forming the backbone and side chains of β-GGM are analogous to those that make up XyG, and moreover, these linkages are formed by glycosyltransferases from the same CAZy families. Solid-state nuclear magnetic resonance indicated that β-GGM shows low mobility in the cell wall, consistent with interaction with cellulose. Although Arabidopsis β-GGM synthesis mutants show no obvious growth defects, genetic crosses between β-GGM and XyG mutants produce exacerbated phenotypes compared with XyG mutants. These findings demonstrate a related role of these two similar but distinct classes of hemicelluloses in PCWs. This work opens avenues to study the roles of β-GGM and XyG in PCWs.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego