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Keybot 9 Results  www.listeriosis-listeriose.investigation-enquete.gc.ca
  L'industrie canadienne...  
Courriel : info@acd.ca
Fax: 613-238-3411
  Facile preparation of s...  
Les fibres de mélange n’exhibaient qu’une température de transition vitreuse sur les thermogrammes d’analyse calorimétrique différentielle (ACD) en raison de la forte compatibilité des deux composants.
Using formic acid as a cosolvent and saturated sodium sulfate as a coagulation bath, soy protein/poly(vinyl alcohol) (PVA) blend fibers were prepared using wet-spinning approaches. The structure and mechanical, thermal, and water-uptake properties of the spun fibers were investigated. Morphological analysis with polarized optical microscopy (POM) and scanning electron microscopy (SEM) showed that spun PVA or blend fibers were composed of nanoparticles and exhibited a porous morphology. Blend fibers exhibited only one glass transition temperature in differential scanning calorimetry (DSC) thermograms due to high compatibility between the two components. The best mechanical strength and thermal stability were achieved when 70% PVA was composited with soy protein. This was thought to be due to the effects of cross-linking and hydrogen bonding between functional groups of soy protein and PVA hydroxyl groups.
  Phylogenetic investigat...  
Nous avons utilisé le gène matK et la région trnL‑F des plastes pour étudier les relations entre les espèces et les génomes de 82 spécimens d’Avena représentant 13 espèces diploïdes (génomes A et C), 6 espèces tétraploïdes (génomes AB et AC) et 4 espèces hexaploïdes (génome ACD) en vue d’inférer les voies évolutionnaires ayant mené aux différentes espèces d’Avena.
We investigated the species and genome relationships among 82 Avena accessions representing thirteen diploid species (A and C genomes), six tetraploids (AB and AC genomes) and four hexaploids (ACD genome) to infer the evolutionary pathways in Avena using the plastid matK gene and the trnL-F region. The matK and trnL-F sequences pointed to the A-genome diploid species as maternal parents of the polyploid species. Furthermore, different A-genome diploid species might have served as the A genome donor of several different polyploid species. The probable ancestor of most hexaploid species, of the AC-genome tetraploids, and of the AB-genome species A. agadiriana was A. wiestii (As genome). The likely donor of the other three ABgenome tetraploids was A. hirtula (also As genome) and A. damascena (Ad genome) appears to be the A genome donor of the hexaploid A. fatua. The A genome origin of A. fatua differs from that for the other hexaploid Avena species, which is different from the common assumption that the hexaploid species evolved from a single hexaploid ancestor followed by gain or loss of domestication genes. Thus, several separate maternal lineages might be involved in different polyploid species.