381 research outputs found
Los Lunas Transit Center: An Urban Design Proposal
A revitalization plan for Los Lunas, NM emphasizing transit-oriented design.https://digitalrepository.unm.edu/dpac_projects/1015/thumbnail.jp
Neactaeonina argentina, new species, and family placement of the genus Neactaeonina thiele, 1912 (Mollusca: Gastropoda)
Neactaeonina argentina, a new species from the outer Argentine shelf off Buenos Aires province, is described. The species is characterized by the elongate, low-spired shell, with shouldered, nearly straight whorls, deep suture, and sculpture composed of numerous, broad, flat spiral cords. The radula is similar to that previously described for the type species, Neactaeonina cingulata Thiele, 1912, except in having a greater number of teeth. The present study provides the first information on the anatomy and histology of the genital system, and details of the radula anatomy of Neactaeonina, both unknown to date. The study of anatomical characters demonstrates that Neactaeonina has clear similarities with other Acteonidae, with a combination of features present in Acteon (such as the presence of a strongly calcified shell, with well-developed operculum; mantle cavity opening anteriorly; nervous system with only the cerebropleural ganglia fused; a single allosperm sac associated with the female system; radula without cardinal tooth; and oral cuticle with rod-like processes); and some characters present in acteonid genera other than Acteon (e.g., the number and morphology of teeth, and processes of the oral cuticle). However, Neactaeonina shows some characters thus far not reported for any other genus currently placed into the Acteonidae: salivary glands with laminar structure, male genital system with an open portion, a single allosperm sac opening distally, and a flat and triangular copulatory organ.Fil:Zelaya, D.G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina
Spectropolarimetry of the Type Ia SN 2007sr Two Months After Maximum Light
We present late time spectropolarimetric observations of SN 2007sr, obtained
with the VLT telescope at ESO Paranal Observatory when the object was 63 days
after maximum light. The late time spectrum displays strong line polarization
in the CaII absorption features. SN 2007sr adds to the case of some normal Type
Ia SNe that show high line polarization or repolarization at late times, a fact
that might be connected with the presence of high velocity features at early
times
A spectropolarimetric view on the nature of the peculiar Type I SN 2005hk
We report two spectropolarimetric observations of SN 2005hk, which is a close
copy of the "very peculiar" SN 2002cx, showing low peak luminosity, slow
decline, high ionization near peak and an unusually low expansion velocity of
only about 7,000 km s^-1. Further to the data presented by Chornock et al.,
(2006), at -4 days before maximum, we present data of this object taken on 9
November 2005 (near maximum) and 23 November (+ two weeks) that show the
continuum and most of the spectral lines to be polarized at levels of about
0.2-0.3%. At both epochs the data corresponds to the Spectropolarimetric Type
D1. The general low level of line polarization suggests that the line forming
regions for most species observed in the spectrum have a similar shape to that
of the photosphere, which deviates from a spherical symmetry by <10%. In
comparison with spectropolarimetry of Type Ia and Core-collapse SNe at similar
epochs, we find that the properties of SN 2005hk are most similar to those of
Type Ia SNe. In particular, we find the low levels of continuum and line
polarization to indicate that the explosion mechanism is approximately
spherical, with homogeneous ejecta (unlike the chemically segregated ejecta of
CCSNe). We discuss the possibility that SN 2005hk was the result of the pure
deflagration of a white dwarf and note the issues concerning this
interpretation.Comment: ApJ accepted, uses emulateapj, 16 pages, 10 figures, figures 3 and 4
update
MĆ£e sĆ³ muda de endereƧo
O presente texto cuida de focar o tema da naturalizaĆ§Ć£o da maternidade, com a finalidade de orientar os interessados nas questƵes de gĆŖnero sobre a desconstruĆ§Ć£o de preceitos acerca da feminilidade. A construĆ§Ć£o da categoria mulher perpassa por diversos trajetos e correntes, desde o senso comum atĆ© o feminismo radical. Aqui, de certa forma, nos prenderemos mais Ć desconstruĆ§Ć£o do senso comum em relaĆ§Ć£o Ć naturalizaĆ§Ć£o da mulher. Neste processo, foram utilizadas entrevistas com mulheres, em sua maioria mĆ£es, que se viram questionadas sobre os papeis sociais e naturais associados a sua vida maternal. Concluindo-se a complexidade de uma construĆ§Ć£o histĆ³rica secular acerca de sua ānatureza maternalā
Properties of extragalactic dust inferred from linear polarimetry of Type Ia Supernovae
Aims: The aim of this paper is twofold: 1) to investigate the properties of
extragalactic dust and compare them to what is seen in the Galaxy; 2) to
address in an independent way the problem of the anomalous extinction curves
reported for reddened Type Ia Supernovae (SN) in connection to the environments
in which they explode. Methods: The properties of the dust are derived from the
wavelength dependence of the continuum polarization observed in four reddened
Type Ia SN: 1986G, 2006X, 2008fp, and 2014J. [...] Results: All four objects
are characterized by exceptionally low total-to-selective absorption ratios
(R_V) and display an anomalous interstellar polarization law, characterized by
very blue polarization peaks. In all cases the polarization position angle is
well aligned with the local spiral structure. While SN~1986G is compatible with
the most extreme cases of interstellar polarization known in the Galaxy,
SN2006X, 2008fp, and 2014J show unprecedented behaviours. The observed
deviations do not appear to be connected to selection effects related to the
relatively large amounts of reddening characterizing the objects in the sample.
Conclusions: The dust responsible for the polarization of these four SN is most
likely of interstellar nature. The polarization properties can be interpreted
in terms of a significantly enhanced abundance of small grains. The anomalous
behaviour is apparently associated with the properties of the galactic
environment in which the SN explode, rather than with the progenitor system
from which they originate. For the extreme case of SN2014J, we cannot exclude
the contribution of light scattered by local material; however, the observed
polarization properties require an ad hoc geometrical dust distribution.Comment: 10 pages, 6 figures, accepted for publication in Astronomy and
Astrophysic
Neural correlates of visuospatial working memory in the āat-risk mental stateā
Background. Impaired spatial working memory (SWM) is a robust feature of schizophrenia and has been linked to
the risk of developing psychosis in people with an at-risk mental state (ARMS). We used functional magnetic
resonance imaging (fMRI) to examine the neural substrate of SWM in the ARMS and in patients who had just
developed schizophrenia.
Method. fMRI was used to study 17 patients with an ARMS, 10 patients with a first episode of psychosis and 15 agematched
healthy comparison subjects. The blood oxygen level-dependent (BOLD) response was measured while
subjects performed an objectālocation paired-associate memory task, with experimental manipulation of mnemonic
load.
Results. In all groups, increasing mnemonic load was associated with activation in the medial frontal and medial
posterior parietal cortex. Significant between-group differences in activation were evident in a cluster spanning the
medial frontal cortex and right precuneus, with the ARMS groups showing less activation than controls but greater
activation than first-episode psychosis (FEP) patients. These group differences were more evident at the most
demanding levels of the task than at the easy level. In all groups, task performance improved with repetition of the
conditions. However, there was a significant group difference in the response of the right precuneus across repeated
trials, with an attenuation of activation in controls but increased activation in FEP and little change in the ARMS.
Conclusions. Abnormal neural activity in the medial frontal cortex and posterior parietal cortex during an SWM task
may be a neural correlate of increased vulnerability to psychosis
Plasmacytoid myoepithelioma of the palate : report of one case and review of the literature
Introduction: Myoepithelioma is a benign neoplasm of salivary glands, represents 1.5 % of all salivary glands neoplasm. The plasmacytoid myoepithelioma from palate salivary glands is considered as a rare entity, at date it has been reported 14 cases. It is present one case of plasmacytoid myoepithelioma of palate. Case report: A Hispanic female of 28 years old presented a not-ulcerate, painless ovoid swelling at left side of hard palate with a one year and a half of evolution. An excisional biopsy was done. The sample was fixed at 10% buffer formalin, embedded in paraffin, cuts at 5 Āµ and stained with H-E. Microscopically, the lesion was composed by myoepithelial neoplastic cells characterized by a round ovoid silhouette, an eccentric nuclei of dense chromatin and eosinophilic cytoplasm. In some myoepithelial neoplastic cells were identifies intranuclear cytoplasmatic inclusions. The lesion was analysed with immunohistochemical technique using the follow antibodies: vimentin, citokeratin AE1/AE3, S100 protein and actin muscle specific. We observe positive immunoreactivity against vimentin, citokeratin, S100 protein and actin muscle specific. A diagnosis of plasmacytoid myoephitelioma of palate salivary glands was done. Our findings supports the suggestion about plasmacytoid myoepithelioma is an independent entity. The histological diagnostic parameters of plasmacytoid myoepithelioma versus pleomorphic adenoma are discussed
Management of diabetes after hospital discharge
Hemos leĆdo con interĆ©s el artĆculo publicado por Sainz de los Terreros y col que trata la evaluaciĆ³n de un protocolo de seguimiento para diabetes tras el alta hospitalaria1. En el trabajo se detallan los resultados derivados de la optimizaciĆ³n āfundamentalmente a travĆ©s de contacto telefĆ³nicoā del tratamiento antidiabĆ©tico. La disminuciĆ³n media global de HbA1c fue significativa (de 8,62 a 7,19%), con un muy bajo porcentaje de efectos adversos en forma de hipoglucemias graves
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