3,285 research outputs found
A catalog of Kazarian galaxies
The entire Kazarian galaxies (KG) catalog is presented which combines
extensive new measurements of their optical parameters with a literature and
database search. The measurements were made using images extracted from the
STScI Digitized Sky Survey (DSS) of Jpg(blue), Fpg(red) and Ipg(NIR) band
photographic sky survey plates obtained by the Palomar and UK Schmidt
telescopes. We provide accurate coordinates, morphological type, spectral and
activity classes, blue apparent diameters, axial ratios, position angles, red,
blue and NIR apparent magnitudes, as well as counts of neighboring objects in a
circle of radius 50 kpc from centers of KG. Special attention was paid to the
individual descriptions of the galaxies in the original Kazarian lists, which
clarified many cases of misidentifications of the objects, particularly among
interacting systems. The total number of individual Kazarian objects in the
database is now 706. We also include the redshifts which are now available for
404 galaxies and the 2MASS infrared magnitudes for 598 KG. The database also
includes extensive notes, which summarize information about the membership of
KG in different systems of galaxies, and about revised activity classes and
redshifts. An atlas of several interesting subclasses of KG is also presented.Comment: 15 pages, 5 figures, 1 table, Accepted in Astrophysics, Vol. 53, No.
1, 2010 (English translation of Astrofizika
Tettigonioideos españoles [Ephippigerinae]
Tesis Univ. Complutense Madrid, 1984.Fac. de Ciencias BiológicasTRUEProQuestpu
Tettigonioideos españoles [Ephippigerinae]
Tesis Univ. Complutense Madrid, 1984.Fac. de Ciencias BiológicasTRUEProQuestpu
Simultaneous B'V'R' Monitoring of BL Lacertae Object S5~0716+714 and Detection of Inter-Band Time Delay
We present the results of our optical monitoring of the BL Lac object S5
0716+714 on seven nights in 2006 December. The monitoring was carried out
simultaneously at three optical wavelengths with a novel photometric system.
The object did not show large-amplitude internight variations during this
period. Intranight variations were observed on four nights and probably on one
more. Strong bluer-when-brighter chromatism was detected on both intranight and
internight timescales. The intranight variation amplitude decreases in the
wavelength sequence of B', R', and V'. Cross correlation analyses revealed that
the variability at the and bands lead that at the band by about
30 minutes on one night.Comment: 31 pages, 12 figures, accepted by the Astronomical Journa
La Colonización del currículum y el mito de la modernidad en educación superior reflexiones de los docentes de la Unidad Académica de Economía de la UAZ
In the present work the phenomenon of colonization of the curriculum from
modernity in higher education is exposed, the licenciatura in economics allows
to visualize a critical panorama to the curricular adjustments given towards an
integral formation, from the UAZ Educational Model.
The arrival of external educational plans influenced by western ideology,
see higher education as a company capable of generating profit, hence terms
such as quality, modernity, have been adopted in the curricula with special
interest. That is why it is said that the curricular contents represent new forms of
colonization, and modernization, with the discourse of the idea of progress, has
been able to transform the social function of education. The curriculum is a
historical and social construction that must be studied and understood as such,
hence the need to put in tension and question the educational models imposed
by modernity and, consequently, identify the successes and deficiencies of the
curricular models of this so-called modernity. The objective of the work in
question is to present an analysis of the influence of modernity and colonization
on the curriculum in higher education, specifically in the Licenciatura en
Economía de la Universidad Autónoma de Zacatecas “Francisco García
Salinas”; the above, from different theoretical perspectives and according to the
teaching opinion. The look of the teachers is fundamental to know their
appreciations in terms of the nuances that permeate the so-called modern
curriculum, as they are constant evaluators of this journey at the higher level; for
this purpose, the semi-structured interview was attended. By way of conclusion,
some reflections resulting from the fieldwork are presented.En el presente trabajo se expone el fenómeno de colonización del currículum
desde la modernidad en educación superior, la licenciatura en economía permite
visualiza un panorama crítico a los ajustes curriculares dados hacia una
formación integral, desde el Modelo Educativo UAZ.
El arribo de planes educativos externos influenciados de ideología
occidentales, ven a la educación superior como una empresa susceptible de
generar lucro, de ahí que términos como calidad, modernidad, han sido
adoptados en los planes de estudio con especial interés. Por eso se dice que los
contenidos curriculares representan nuevas formas de colonización, y la
modernización, con el discurso de la idea de progreso, ha sido capaz de
transformar la función social de la educación. El currículum es una construcción
histórica y social que debe ser estudiada y comprendida como tal, de ahí la
necesidad de poner en tensión y cuestionar los modelos educativos impuestos
por la modernidad y, en consecuencia, identificar los aciertos y las deficiencias
de los modelos curriculares de esta llamada modernidad. El objetivo del trabajo
en cuestión, es presentar un análisis sobre la influencia de la modernidad y la
colonización en el currículum en educación superior, concretamente en la
Licenciatura en Economía de la Universidad Autónoma de Zacatecas “Francisco
García Salinas”; lo anterior, desde diferentes perspectivas teóricas y según la
opinión docente. La mirada de los docentes resulta fundamental para conocer
sus apreciaciones en cuanto a los matices que permean en el llamado currículum
moderno, por ser ellos evaluadores constantes de este trayecto en el nivel
superior; para tal efecto, se acudió a la entrevista semi estructurada. A manera
de conclusión, se presentan algunas reflexiones resultado del trabajo de campo
Characterisation of Connexin Expression and Electrophysiological Properties in Stable Clones of the HL-1 Myocyte Cell Line
The HL-1 atrial line contains cells blocked at various developmental stages. To obtain homogeneous sub-clones and correlate changes in gene expression with functional alterations, individual clones were obtained and characterised for parameters involved in conduction and excitation-contraction coupling. Northern blots for mRNAs coding for connexins 40, 43 and 45 and calcium handling proteins (sodium/calcium exchanger, L- and T-type calcium channels, ryanodine receptor 2 and sarco-endoplasmic reticulum calcium ATPase 2) were performed. Connexin expression was further characterised by western blots and immunofluorescence. Inward currents were characterised by voltage clamp and conduction velocities measured using microelectrode arrays. The HL-1 clones had similar sodium and calcium inward currents with the exception of clone 2 which had a significantly smaller calcium current density. All the clones displayed homogenous propagation of electrical activity across the monolayer correlating with the levels of connexin expression. Conduction velocities were also more sensitive to inhibition of junctional coupling by carbenoxolone (∼80%) compared to inhibition of the sodium current by lidocaine (∼20%). Electrical coupling by gap junctions was the major determinant of conduction velocities in HL-1 cell lines. In summary we have isolated homogenous and stable HL-1 clones that display characteristics distinct from the heterogeneous properties of the original cell line
Optical Monitoring of BL Lacertae Object OJ 287: a 40-Day Period?
We present the results of our optical monitoring of the BL Lacertae object OJ
287 during the first half of 2005. The source did not show large-amplitude
variations during this period and was in a relatively quiescent state. A
possible period of 40 days was derived from its light curves in three BATC
wavebands. A bluer-when-brighter chromatism was discovered, which is different
from the extremely stable color during the outburst in 1994--96. The different
color behaviors imply different variation mechanisms in the two states. We then
re-visited the optical data on OJ 287 from the OJ-94 project and found as well
a probable period of 40 days in its optical variability during the late-1994
outburst. The results suggest that two components contribute to the variability
of OJ 287 during its outburst state. The first component is the normal {\sl
blazar} variation. This component has an amplitude similar to that of the
quiescent state and also may share a similar periodicity. The second component
can be taken as a `low-frequency modulation' to the first component. It may be
induced by the interaction of the assumed binary black holes in the center of
this object. The 40-day period may be related to the helical structure of the
magnetic field at the base of the jet, or to the orbital motion close to the
central primary black hole.Comment: 31 pages, 8 figures, accepted by A
Stellar spectroscopy: Fermions and holographic Lifshitz criticality
Electron stars are fluids of charged fermions in Anti-de Sitter spacetime.
They are candidate holographic duals for gauge theories at finite charge
density and exhibit emergent Lifshitz scaling at low energies. This paper
computes in detail the field theory Green's function G^R(w,k) of the
gauge-invariant fermionic operators making up the star. The Green's function
contains a large number of closely spaced Fermi surfaces, the volumes of which
add up to the total charge density in accordance with the Luttinger count.
Excitations of the Fermi surfaces are long lived for w <~ k^z. Beyond w ~ k^z
the fermionic quasiparticles dissipate strongly into the critical Lifshitz
sector. Fermions near this critical dispersion relation give interesting
contributions to the optical conductivity.Comment: 38 pages + appendices. 9 figure
Collapsing Glomerulonephritis in a Kidney Transplant Recipient after mRNA SARS-CoV-2 Vaccination
With the vaccination against severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), studies are describing cases of glomerulonephritis arising after vaccination. We present the first case of a kidney transplant patient who, after mRNA vaccination against SARS-CoV-2, developed nephrotic proteinuria and renal dysfunction, with a biopsy diagnostic of collapsing glomerulonephritis. No other triggers for this glomerulonephritis were identified. Antibodies against the spike protein were negative, but the patient developed a specific T-cell response. The close time between vaccination and the proteinuria suggests a possible determinant role of vaccination. We should be aware of nephropathies appearing after COVID-19 vaccination in kidney transplant recipients also
Variación espacial de la calidad del agua para uso agrícola del acuífero costero del Valle del Mayo, Sonora, México
In this study the hydrochemical patterns of the Mayo River aquifer, in the Mayo River Irrigation District, and the factors determining the spatial distribution of the water quality for irrigation were determined. Physicochemical information, from 2005 to 2007, of 54 goereference wells was classified in the Piper diagram and principal component analysis (PCA). The use of the hydrochemical method and PCA allowed to identify the existing hidrochemical patterns and the factors that influence them. Close to Mayo riverbed waters were classified as magnesium-calcium bicarbonate, indicating short term resident time of water. North of the aquifer sulfate samples dominated, as a result of water circulation on sedimentary evaporite deposits. In the southcentral area most waters were saline-sodic.En este estudio se determinaron los patrones hidroquímicos presentes en el acuífero del Valle del Mayo, en el área del Distrito de Riego Río Mayo y se identificaron los factores que influyen en su distribución espacial a fin de identificar los procesos que afectan la calidad del agua en el acuífero para uso agrícola. Se clasificó la información físico-química de 54 pozos georeferenciados, para el periodo 2005 al 2007, en el diagrama de Piper y se realizó un análisis de componentes principales (PCA). La aplicación del método hidroquímico y el (PCA), permitieron identificar los patrones hidroquímicos presentes en el acuífero y los factores que los originan. En las cercanías del Río Mayo las aguas corresponden al tipo bicarbonatadas magnésicas-cálcicas, indicando aguas con poco tiempo de residencia. En la parte norte del acuífero predominaron las muestras sulfatadas, resultado de la circulación del agua por depósitos sedimentarios evaporíticos. En el centrosur el agua es del tipo clorurada sódica principalmente
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