1,157 research outputs found
Large flats in the pants graph
This note is about the geometry of the pants graph P(S), a natural simplicial
graph associated to a finite type topological surface S where vertices
represents pants decompositions. The main result in this note ascserts that for
a multicurve Q whose complement is a number of subsurfaces of complexity at
most 1. We prove that the corresponding subgraph P(Q) is totally geodesic in P,
previously considering this as a metric space assigning length one to each
edge. A flat is a graph isomorphic to the Cayley graph of an abelian torsion
free group of finite rank. As a consequence of the main theorem we make
explicit the existence of maximal size flats (large flats) in the pants graph.Comment: 16 pages, 3 figure
Protein Oxidation in Foods: Mechanisms, Consequences, and Antioxidant Solutions
Protein oxidation in foods remains a topic of the utmost scientific interest [...
Release experiments with Octopus vulgaris Cuvier, 1797 in Galicia, NW Spain. First results on recapture rate, distribution and growth.
This paper describes the release experiments carried out with 465 octopus (Octopus vulgaris Cuvier, 1797) with an average weight ranging from 703 to 986 g in three different areas in the Ría of Vigo, Galicia, NW Spain. Thirty-seven individuals were recaptured by fishermen, representing a total recapture rate of 7.9 %. Among these, 80.5 % remained within 5 km of the release point, showing a sedentary behavior. The specific growth rate (SGR) in weight was 0.00902 ± 0.00468; there was not a significant difference between males and females. The exponential growth curve is the best fitting theoretical model. Life expectancy in Ría de Vigo waters was estimated at 18 months for males, and 16 months for females. Throughout the recapture process, males were predominant over females, giving a sex ratio of 1.83:1. Data reported in this paper on recapture rate, sedentary behavior and instantaneous growth rate can be used as reference for future stocking programs in Galicia
Culture viability of Sarddina pilchardus: preliminary results of growth in captivity
Larvae
of
Sardina
pilchardus
were
obtained
in
captivity
from
fertilized
eggs
captured
in
the
wild,
and
grown
in
a
10
000
L
tank.
Isochrysis
galbana
,
Artemia
franciscana
nauplii
and
live
zooplankton
were
used
as
prey
during
the
first
two
weeks;
afterwards,
anim
als
were
fed
on
artemia
metanauplius
enriched
with
Isochrysis
galbana
.
A
dry
feed
(Gemma
0.4
and
0.8)
from
SKRETTING
S.A.
(Burgos,
España)
was
supplied
from
the
third
to
18th
month.
The
total
length
reached
by
sardines
at
one
year
of
life
was
162.02
±
9.
49
mm,
corresponding
to
a
wet
weight
of
36.12
±
10.82
g.
Total
length
at
18
months
was
182.37
mm.
A
long
experiment
(18
‐
month)
of
sardine
culture
is
described
for
the
first
time,
and
growth
data
reported
can
contribute
to
determine
its
potential
interest
as
a
candidate
for
marine
aquacultur
Culture viability of Sardine pilchardus (Fish, teleost): Preliminary results of growth in captivity up to 18 months
Larvae of Sardina pilchardus were obtained in captivity from fertilized eggs captured in the wild and grown in a 10000-L tank. Isochrysis galbana, Artemia franciscana nauplii and live zooplankton were used as prey during the first two weeks; afterwards, the animals were fed on Artemia metanauplii enriched with Isochrysis galbana. A dry feed (Gemma 0.4 and 0.8) from Skretting S.A. (Burgos, España) was supplied from the 3rd to the 18th month. The total length reached by sardines at one year of life was 162.02±9.49 mm, corresponding to a wet weight of 36.12±10.82 g. Total length of the last survivor individual at 18 months was 182.37 mm. An 18-month experiment of sardine culture is described for the first time, and the growth data reported can help to determine its potential as a candidate for marine aquaculture.Publicado
1+1 spectral problems arising from the Manakov-Santini system
This paper deals with the spectral problem of the Manakov Santini system. The
point Lie symmetries of the Lax pair have been identified. Several similarity
reductions arise from these symmetries. An important benefit of our procedure
is that the study of the Lax pair instead of the partial differential equations
yields the reductions of the eigenfunctions and also the spectral parameter.
Therefore, we have obtained five interesting spectral problems in 1+1
dimensions
Purkinje cell-specific Grip1/2 knockout mice show increased repetitive self-grooming and enhanced mGluR5 signaling in cerebellum
Cerebellar Purkinje cell (PC) loss is a consistent pathological finding in autism. However, neural mechanisms of PC-dysfunction in autism remain poorly characterized. Glutamate receptor interacting proteins 1/2 (Grip1/2) regulate AMPA receptor (AMPAR) trafficking and synaptic strength. To evaluate role of PC-AMPAR signaling in autism, we produced PC-specific Grip1/2 knockout mice by crossing Grip2 conventional and Grip1 conditional KO with L7-Cre driver mice. PCs in the mutant mice showed normal morphology and number, and a lack of Grip1/2 expression. Rodent behavioral testing identified normal ambulation, anxiety, social interaction, and an increase in repetitive self-grooming. Electrophysiology studies revealed normal mEPSCs but an impaired mGluR-LTD at the Parallel Fiber-PC synapses. Immunoblots showed increased expression of mGluR5 and Arc, and enhanced phosphorylation of P38 and AKT in cerebellum of PC-specific Grip1/2 knockout mice. Results indicate that loss of Grip1/2 in PCs contributes to increased repetitive self-grooming, a core autism behavior in mice. Results support a role of AMPAR trafficking defects in PCs and disturbances of mGluR5 signaling in cerebellum in the pathogenesis of repetitive behaviors.University of Seville (V PPIT-US)Spain and an National Institute of Health (NIH) (NS085358
Textural and geochemical features of pyrite from the intramagmatic Ni-Cu-PGE mineralization of Aguablanca (Badajoz)
Depto. de Mineralogía y PetrologíaFac. de Ciencias GeológicasFALSEEspaña. Dirección General de Investigación Científica y Técnicapu
Fractionation evidences in the intramagmatic Ni-Cu-PGE mineralization of Aguablanca (Badajoz)
Depto. de Mineralogía y PetrologíaFac. de Ciencias GeológicasFALSEpu
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