The UNAM-KIAS Catalog of Isolated Galaxies

A new catalog of isolated galaxies from The Sloan Digital Sky Survey (DR5) is presented. 1520 isolated galaxies were found in 1.4 steradians of sky. The selection criteria in this so called UNAM-KIAS catalog was implemented from a variation on the criteria developed by Karachentseva 1973 including full redshift information. Through an image processing pipeline that takes advantage from the high resolution (~ 0.4 ''/pix) and high dynamic range of the SDSS images, a uniform g band morphological classification for all these galaxies is presented. We identify 80% (SaSm) spirals (50% later than Sbc types) on one hand, and a scarce population of early-type E(6.5%) and S0(8%) galaxies amounting to 14.5% on the other hand. This magnitude-limited catalog is ~ 80% complete at 16.5, 15.6, 15.0, 14.6 and 14.4 magnitudes in the ugriz bands respectively. Some representative physical properties including SDSS magnitudes and color distributions, color-color diagrams, absolute magnitude-color, and concentration-color diagrams as a function of morphological type are presented. The UNAM-KIAS Morphological Atlas is also released along with this paper. For each galaxy of type later than Sa, a mosaic is presented that includes: (1) a g-band logarithmic image, (2) a g band filtered-enhanced image where a Gaussian kernel of various sizes was applied and (3) an RGB color image from the SDSS database. For E/S0/Sa galaxies, in addition to the images in (1), (2) and (3), plots of r band surface brightness and geometric profiles (ellipticity, Position Angle PA and A4/B4 coefficients of the Fourier series expansions of deviations of a pure ellipse) are provided...Comment: 40 pages, 17 figures and 3 table

The UNAM-KIAS Catalog of Isolated Galaxies

A new catalog of isolated galaxies from The Sloan Digital Sky Survey (DR5) is presented. 1520 isolated galaxies were found in 1.4 steradians of sky. The selection criteria in this so called UNAM-KIAS catalog was implemented from a variation on the criteria developed by Karachentseva 1973 including full redshift information. Through an image processing pipeline that takes advantage from the high resolution (~ 0.4 ''/pix) and high dynamic range of the SDSS images, a uniform g band morphological classification for all these galaxies is presented. We identify 80% (SaSm) spirals (50% later than Sbc types) on one hand, and a scarce population of early-type E(6.5%) and S0(8%) galaxies amounting to 14.5% on the other hand. This magnitude-limited catalog is ~ 80% complete at 16.5, 15.6, 15.0, 14.6 and 14.4 magnitudes in the ugriz bands respectively. Some representative physical properties including SDSS magnitudes and color distributions, color-color diagrams, absolute magnitude-color, and concentration-color diagrams as a function of morphological type are presented. The UNAM-KIAS Morphological Atlas is also released along with this paper. For each galaxy of type later than Sa, a mosaic is presented that includes: (1) a g-band logarithmic image, (2) a g band filtered-enhanced image where a Gaussian kernel of various sizes was applied and (3) an RGB color image from the SDSS database. For E/S0/Sa galaxies, in addition to the images in (1), (2) and (3), plots of r band surface brightness and geometric profiles (ellipticity, Position Angle PA and A4/B4 coefficients of the Fourier series expansions of deviations of a pure ellipse) are provided...Comment: 40 pages, 17 figures and 3 table

Technological properties of maize tortillas produced by microwave nixtamalization with variable alkalinity

This research was conducted to determine the quality, physicochemical, textural, compositional, nutritional, viscoamylographic and sensory properties of maize tortillas produced with a Modified tortilla-making process (MTMP) of variable alkalinity (0.125, 0.25 and 0.5% Ca(OH)2 w/w) and compared to the commercial brand MASECA ®. In general, tortillas from MTMP showed higher pH, total color difference (ΔE), tensile strength/cutting force, protein, lipids, crude fibre, lysine, tryptophan, in vitro protein digestibility and lower Hunter L value, loss of weight during cooking and moisture content than MASECA® tortillas. No significant differences were found in the sensory analysis of 22 descriptors of tortillas made from MASECA® and MTMP with Ca(OH)2 concentrations of 0.125 and 0.25% (w/w). However, panelist identified principal effects on changes in four attributes (aroma, appearance, flavor, and after taste flavor) and seven descriptors in tortillas from MTMP prepared with the maximum lime concentration (0.5% w/w). Microwave nixtamalization produce tortillas with acceptable physicochemical, textural, quality, compositional/nutritional and pasting properties.Key words: Maize, modified nixtamalization, tortillas, technological properties

Spanish Research Report for 1992

7 páginas, 11 tablasPeer reviewe

Evaluación de mejores prácticas de manejo para reducir las pérdidas de nutrientes contaminantes en escorrentía desde suelos enmendados con carnada de pollos parrilleros. I. Adiciones de alum.

The effect of alum [AI2(S04)3.14H20] on reducing phosphorus (P) concentrations in runoff water from broiler litter-amended soils was evaluated in various simulated rainfall events. Additions of alum at a 20% (w/wO) rate caused a significant reduction in the "soluble" (CaCI2-extractable) P fraction of the broiler litter matrix. As a result, the soluble P fraction added to the soils through litter application was 43% and 75% less for the 6 t/ha and the 20 t/ha litter treatments with alum than for their untreated (0 alum) counterparts. Total phosphorus (TP) concentrations in runoff for the 6 t/ha and 20 t/ha treatments with no alum were highly enriched, averaging 2.59 mg/L and 6.10 mg/L, respectively. At the highest litter rate (i.e., 20 t/ha) the 20% alum treatment achieved a 52% reduction in the concentration of TP in runoff as compared to that of the no-alum treatment. However, the impact of alum was more notable in reducing dissolved P (DP) losses. Average DP concentration losses for the 20 t/ha broiler litter rate (no alum) was 3.55 mg/L, a value significantly higher than the 1.0 mg/L threshold that has been suggested as a potential limit to control runoff P losses from agricultural fields. At said broiler litter application rate the 10% and 20% alum treatments resulted in reductions of 58% and 70% of the DP concentrations in runoff, respectively. The observed DP concentration losses from the litter treatments containing 20% alum met the 1 mg/L threshold value in practically all instances. Total P losses in runoff were positively correlated with both the amount of CaCI2-extractable P applied to the soils and soil P levels (Olsen) during different stages of the simulation events. The nutritional contents (N, P, and K) of the Bermuda grass samples were reflective of the broiler litter rate. Higher nutritional contents were generally observed with the 20 t/ha treatments as compared to those at the 6 t/ha rate with no alum, even though the effects were statistically significant only for nitrogen. Alum did not seem to exert a significant impact on nutritional content of the Bermuda grass, although a slight decrease (non significant) in both N and P was observed at the 20% alum rate for the 20 t/ha broiler litter rate.El efecto de alum [AI2(S04)3-14H20] en la reducción de las concentraciones de fósforo (P) en las aguas de escorrentía desde los suelos enmendados con residuos de carnadas de pollos parrilleros se evaluó en varios eventos de lluvia simulada. Adiciones de alum a razón de 20% (peso/peso) causaron una reducción significativa en la fracción de P "soluble" (CaCI2-extraíble) presente en la matriz de la carnada de pollos parrilleros. Como resultado, el P soluble añadido al suelo se redujo en un 43% y un 75% para los tratamientos de 6 t/ha y 20 t/ha de residuos de carnada de pollos parrilleros con alum en comparación con sus contrapartes sin alum. Las concentraciones de P total en la escorrentía de los tratamientos 6 t/ha y 20 t/ha de residuos de carnada de pollos parrilleros sin alum resultaron altamente enriquecidas, promediando 2.59 y 6.10 mg/L, respectivamente. En la dosis más alta de residuos de carnada de pollos parrilleros (20 t/ha), el tratamiento de 20% de alum logró una reducción de 52% en la concentración de P total en la escorrentía relativo al tratamiento sin alum. Sin embargo, el efecto más notable de alum fue en la reducción de las pérdidas de P disuelto. Las pérdidas en las concentraciones de P disuelto promedio en el tratamiento de 20 t/ha de residuos de carnada de pollos parrilleros (sin alum) fue de 3.55 mg/L, un valor significativamente mayor que el umbral de 1.0 mg/L que ha sido sugerido como el límite potencial para el control de pérdidas de P por escorrentía de predios agrícolas. En dicha dosis de aplicación los tratamientos de 10% y 20% de alum alcanzaron reducciones de 58% y 70% en las concentraciones de P disuelto en la escorrentía, espectivamente. Las pérdidas en las concentraciones de P disuelto observadas para los tratamientos con 20% de alum cumplieron con el valor umbral de 1.0 mg/L en prácticamente todos los casos, irrespectivamente de la dosis de residuos de carnada de pollos parrilleros evaluada. Las pérdidas de P total en la escorrentía fue correlacionada positivamente tanto con la fracción de P soluble (extraíble con CaCI2) aplicado a los suelos, como con los niveles de P (Olsen) en el suelo durante las diferentes etapas de los eventos de simulación de lluvia. El contenido nutricional (N, P, y K) para muestras de hierba Bermuda reflejó el efecto de las diferentes dosis de residuos de carnada de pollos parrilleros. Se observó un mayor contenido nutricional en los tratamientos de 20 t/ha comparado con los de 6 t/ha. No obstante, los efectos solo fueron estadísticamente significativos para nitrógeno. El alum no parece ejercer un impacto significativo en el contenido nutricional de la yerba Bermuda, aunque se observaron disminuciones leves (no significativas) para N y P en el tratamiento de 20 t/ha de carnada de pollos parrilleros con 20% de alum

Fijación de la no-unión del proceso ancóneo mediante tornillo. Estudio retrospectivo en 13 casos clínicos

En este estudio se hace una evaluación retrospectiva de la técnica de fijación con tornillo del proceso ancóneo no unificado en una serie de 13 casos. Los resultados de la cirugía (con un seguimiento de 2 años de media) fueron considerados "excelentes" o "buenos" en 12 o 13 casos, y todos los animales mejoraron el grado de cojera. En el 92% de los codos se consiguió una unión ósea completa del proceso ancóneo, y en el 70%, un estancamiento de la artrosis. La tasa de complicaciones fue del 15%, todas ellas de carácter muy leve.

Extended stellar populations in Ultra-Faint Dwarf galaxies

The possible existence of stellar halos in low-mass galaxies is being intensely discussed nowadays after some recent discoveries of stars located in the outskirts of dwarf galaxies of the Local Group. RR Lyrae stars can be used to identify the extent of these structures, taking advantage of the minimization of foreground contamination they provide. In this work we use RR Lyrae stars obtained from Gaia DR3, DES, ZTF, and Pan-STARRS1 to explore the outskirts of $45$ ultra-faint dwarf galaxies. We associate the stars with a host galaxy based on their angular separations, magnitudes and proper motions. We find a total of $120$ RR Lyrae stars that belong to $21$ different galaxies in our sample. We report seven new RR Lyrae stars in six ultra-faint dwarf galaxies (Hydrus I, Ursa Major I, Ursa Major II, Grus II, Eridanus II and Tucana II). We found a large number of new possible members in Bootes I and Bootes III as well, but some of them may actually belong to the nearby Sagittarius stream. Adding to our list of $120$ RR Lyrae stars the observations of other ultra-faint dwarf galaxies that were out of the reach of our search, we find that at least $10$ of these galaxies have RR Lyrae stars located at farther distances than $4$ times their respective half-light radius, which implies that at least $33\%$ of the 30 ultra-faint dwarfs with RR Lyrae star population have extended stellar populations.Comment: 22 pages. Accepted for publication in A