9,757 research outputs found
MSAT an alternative choice?
A number of potential applications are described of MSAT that use the unique properties of this transportation mechanism. Emphasis is placed on the market introduction strategy for the North American system
Structure of the copper tripodal Schiff base complex {tris[4-(2-thienyl)-3-aza-κN-3-butenyl]amine-κN}copper(I) tetrafluoroborate
The copper Schiff base complex {tris[4-(2-thienyl)-3-
aza-~N-3-butenyl]amine-~N} copper(I) tetrafluoroborate,
[Cu{N(CTHgNS)3 }]+.BF4- (I), crystallizes with the cation
residing in a general position and two disordered tetrafluoroborate
anions residing on twofold axes. The cation
has approximate threefold symmetry and the copper(I)
geometry is distorted trigonal pyramidal with coordination
from the apical tertiary amine N atom and the three
azomethine N atoms but not from the S atoms of the three
thiophene moieties. The principal bond lengths are Cu--
Napical 2.300 (5) ,~ and mean Cu--Nequatorial 1.994 (4) A,,
with a mean Cu-..S contact of 3.270 (2) A
Dual Fronts Propagating into an Unstable State
The interface between an unstable state and a stable state usually develops a
single confined front travelling with constant velocity into the unstable
state. Recently, the splitting of such an interface into {\em two} fronts
propagating with {\em different} velocities was observed numerically in a
magnetic system. The intermediate state is unstable and grows linearly in time.
We first establish rigorously the existence of this phenomenon, called ``dual
front,'' for a class of structurally unstable one-component models. Then we use
this insight to explain dual fronts for a generic two-component
reaction-diffusion system, and for the magnetic system.Comment: 19 pages, Postscript, A
The genetic architecture underlying the evolution of a rare piscivorous life history form in brown trout after secondary contact and strong introgression
Identifying the genetic basis underlying phenotypic divergence and reproductive isolation is a longstanding problem in evolutionary biology. Genetic signals of adaptation and reproductive isolation are often confounded by a wide range of factors, such as variation in demographic history or genomic features. Brown trout ( ) in the Loch Maree catchment, Scotland, exhibit reproductively isolated divergent life history morphs, including a rare piscivorous (ferox) life history form displaying larger body size, greater longevity and delayed maturation compared to sympatric benthivorous brown trout. Using a dataset of 16,066 SNPs, we analyzed the evolutionary history and genetic architecture underlying this divergence. We found that ferox trout and benthivorous brown trout most likely evolved after recent secondary contact of two distinct glacial lineages, and identified 33 genomic outlier windows across the genome, of which several have most likely formed through selection. We further identified twelve candidate genes and biological pathways related to growth, development and immune response potentially underpinning the observed phenotypic differences. The identification of clear genomic signals divergent between life history phenotypes and potentially linked to reproductive isolation, through size assortative mating, as well as the identification of the underlying demographic history, highlights the power of genomic studies of young species pairs for understanding the factors shaping genetic differentiation
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