Cambios morfosedimentarios causados por la construcción de un espigón en Camet norte, provincia de Buenos Aires, Argentina

Se dan a conocer los diversos cambios morfosedimentarios que se produjeron en un sector de costa ubicado al norte de un espigón construido en Camet Norte (Buenos Aires) a fines del año 2011. Durante el período analizado (julio 2011-diciembre 2015) se observó en un punto de control ubicado a 200 m al norte de la estructura, aguas abajo respecto a la deriva litoral, que el nivel de arena en playa rara vez fue superior al valor registrado en julio de 2011, cuatro meses antes de la construcción de la obra. Lo contrario sucedió con otros tres puntos de control distantes a más de 1.275 m del nuevo espigón, en donde rara vez el nivel de arena fue inferior al observado en esa fecha (julio 2011). A su vez, a lo largo del año la granulometría de la arena correspondiente a la playa frontal del área monitoreada cercana a la obra, por lo general fue más gruesa respecto a los restantes puntos de control, indicando posiblemente una mayor energía de ola en ese sector de costa. El menor nivel de arena asociado a una mayor energía de ola en el sector próximo a la estructura, permitió probablemente la afluencia directa del embate de las mismas durante todo el período, reflejándose esto en un mayor retroceso del acantilado y sobre todo del microacantilado, con un total de 96 y 350 cm (22 y 79 cm/año), respectivamente. Estos retrocesos están asociados preferentemente a eventos de corta duración correspondientes a tormentas marítimas denominadas localmente “sudestadas”.Our study shows several morphodynamic changes occurred along a coastal sector downstream of a groin built at Camet Norte locality (Buenos Aires province) by the end of 2011. During the time span analyzed (July 2011-December 2015), at a control site located 200 m north of the structure, downstream relative to the littoral drift, it was possible to observe that the sand level on the beach was seldom higher than that recorded in July 2011, four months before the groin was built. The opposite occurred in other three control sites placed more than 1,275 m far from the new groin, where the sand level was seldom lower than that observed in July 2011. In addition, along the whole year, the size of the sandy particles of the foreshore in the area localized near the structure was generally higher than that of the remaining control sites, suggesting stronger wave energy within the corresponding coastal sector. Most probably, within control site localized next to groin coastal sector a lower sandy level together with stronger wave energy allowed a direct influx and effect of the waves during the whole time span. This is reflected by a stronger retreat of the main cliff and especially the microcliff, with a total of 96 and 350 cm (22 and 79 cm/year), respectively. These retreats are linked mainly to short marine events locally known as “sudestadas”

Análisis de cadenas de Markov y series de Fourier en una secuencia hemipelágica del Jurásico Superior de la Península Antártica

La Formación Ameghino (Kimmeridgiano-Berriasiano), Cuenca Larsen, Península Antártica, está compuesta por una asociación de microfacies de pelitas con radiolarios (P1), pelitas negras (P2), pelitas bioturbadas y peloidales (P3), tobas (T) y areniscas (A) excelentemente preservadas. Este conjunto de microfacies revela sedimentación pelágica/ hemipelágica en un ambiente deficiente en oxígeno, periódicamente interrumpida por caídas de cenizas del arco volcánico antártico. Análisis basados en cadenas de Markov indican la recurrencia de las microfacies y sus relaciones cíclicas. Se interpreta que la alternancia de pelitas con  radiolarios y pelitas negras (P1-P2) responde a variaciones en la productividad/dilución, mientras que las microfacies de tobas y areniscas corresponden a depósitos de evento que modificaron las condiciones ambientales y diagenéticas evitando la disolución de los esqueletos de radiolarios en la masa de agua y en el fondo, y generando de este modo una memoria markoviana con ciclos T-P1-P2. Por otra parte, el análisis por transformadas de Fourier indica para los ciclos P1-P2 una duración del orden de 1000 años, en el rango de variaciones sub-Milankovitch

Spatially Resolved Star Formation Main Sequence of Galaxies in the Califa Survey

Cano-Díaz, M. et. al.The >main sequence of galaxies> - defined in terms of the total star formation rate ψ versus the total stellar mass M - is a well-studied tight relation that has been observed at several wavelengths and at different redshifts. All earlier studies have derived this relation from integrated properties of galaxies. We recover the same relation from an analysis of spatially resolved properties, with integral field spectroscopic (IFS) observations of 306 galaxies from the CALIFA survey. We consider the SFR surface density in units of log(M yr Kpc) and the stellar mass surface density in units of log(M Kpc) in individual spaxels that probe spatial scales of 0.5-1.5 Kpc. This local relation exhibits a high degree of correlation with small scatter (σ = 0.23 dex), irrespective of the dominant ionization source of the host galaxy or its integrated stellar mass. We highlight (i) the integrated star formation main sequence formed by galaxies whose dominant ionization process is related to star formation, for which we find a slope of 0.81 ± 0.02; (ii) for the spatially resolved relation obtained with the spaxel analysis, we find a slope of 0.72 ± 0.04; and (iii) for the integrated main sequence, we also identified a sequence formed by galaxies that are dominated by an old stellar population, which we have called the retired galaxies sequence.Financial support: M.C.D. and S.F.S.: DGAPA-UNAM funding; CONACyT-180125 and PAPIIT IA-100815 projects. Z.S.: EU Marie Curie Career Integration Grant >SteMaGE> PCIG12-GA-2012-326466. Y.A.: RyC-2011-09461 and AYA2013-47742-C4-3-P projects from the Spanish MINECO and the SELGIFS programme, funded by the EU (FP7-PEOPLE-2013-IRSES-612701). C.J.W.: Marie Curie Career Integration Grant 303912. R.M.G.D.: AyA2014-57490-P and J.A. P12-FQM2828 grants. J.F.B.: AYA2013-48226-C3-1-P from the Spanish MINECO grant. L.G.: Millennium Science Initiative through grant IC120009, and by CONICYT through FONDECYT grant 3140566.Peer Reviewe

Intensidad y frecuencia de alteraciones del metabolismo óseo postrasplante renal

Los pacientes llevados a trasplante renal, potencialmente desarrollan enfermedad ósea relacionada con trasplante,  esta  ocurre  tempranamente  luego  del  trasplante, con una rápida disminución en la densidad mineral ósea en los primeros 6 a 12 meses, de origen multifactorial; combina alteraciones en el metabolismo del calcio, fósforo, hormona paratiroidea (PTH) y vitamina D después de trasplante renal exitoso

Disseminated cutaneous infection by human papilloma virus in a renal transplant patient

Los pacientes sometidos a trasplantes de órgano sólido tienen mayor riesgo de desarrollar patologías ma- lignas e infecciosas en relación con la magnitud y el tiempo de la terapia inmunosupresora. Las infecciones cutáneas son una de las complicaciones más usuales en este tipo de pacientes, siendo las verrugas virales la presentación clínica más frecuente, causadas por el virus del papiloma humano, un virus ADN perteneciente a la familia de los Papillomaviridae , del cual existen cerca de 100 serotipos, algunos conocidos con alto potencial oncogénico, conun elevado riesgo de desarrollar malignidad a nivel anorrectal o cervical. Rara vez estas lesiones se manifiestan antes del primer año del trasplante y su frecuencia aumenta en relación directa a la antigüedad del trasplante, hasta afectar cerca del 80% de los pacientes tras el quinto año postrasplante. En general logran ser tratadas exitosamente con tratamientos convencionales, como crioterapia, curetaje y algu- nos compuestos tópicos como retinoides, imiquimod y, recientemente, se han descrito casos de tratamiento exitoso con cidofovir. Se describe un caso el cual fue refractario al tratamiento convencional y en que se plantean nuevas estrategias de manejo.47-51Patients undergoing solid organ transplants are at risk of developing malignant and infectious diseases related to the magnitude and timing of immunosuppressive therapy, Cutaneous infections are one of the most frequent complications in this patients, viral warts being the most common clinical presentation caused by the human papilloma virus, a DNA virus belonging to the family of the Papillomaviridae, there are at least 100 serotypes, some of these with high oncogenic potential, and that is the reason why these patients patients are at high risk of developing anogenitaltract or cervical malignancies. Rarely these lesions are manifested before the first year after transplantation and its frequency increases in direct proportion to the age of transplantation to affect about 80% of patients after the fifth year post transplant, in general fail to be successfully treated with conventional treatments such as cryotherapy, curettage and some compounds as topical retinoids, imiquimod and recently there have been reports of successful treatment with cidofovir

Landforms, molluscan and coastal evolution during the Holocene at Ensenada Ferrer (Santa Cruz, Patagonia, Argentine)

En este trabajo se propone un esquema evolutivo desde el Holoceno medio hasta el Presente del área costera de Ensenada Ferrer, ubicada al noreste de la Provincia de Santa Cruz, Argentina. Se aplicó el método morfocronológico para la definición de secuencias deposicionales cordoniformes, distinguiéndose dos sistemas y tres grupos, división que está avalada además por el contenido malacológico y características paleoambientales. Estos sistemas están separados entre sí por una superficie de truncamiento y desnivel asociado de 1,5 a 3 m. A su vez, se separan de un sistema más antiguo (Pleistoceno tardío?) por otra superficie de truncamiento con un desnivel asociado de 4 a 6 m. Se propone que estas discontinuidades se habrían originado entre ca. 6.000 y 1.000 años A.P. En relación con los sistemas de cordones identificados, se esboza un esquema evolutivo en tres fases, pasando el sector de ser una bahía abierta hacia el mar circundante (Fase 1), a una bahía semiprotegida (Fase 2), para finalmente alcanzar un alto grado de protección evidenciado por la conformación de la actual planicie de marea parcialmente ascendida (Fase 3)In this paper we attempt an interpretation of the geomorphological evolution since the Mid-Holocene of the coastal area of Ensenada Ferrer, located in the northeastern coastal area of Santa Cruz province, Argentina. The chronostratigraphical method was applied to distinguish between different beach ridges, discriminating between two beach ridge systems including one and two groups, respectively, supported by the molluscan content and palaeoenvironmental conditions. These systems are separated by a truncation surface and an associated slope of ca. 1.5 to 3 m. In turn, they are separated from innermost older (Late Pleistocene?) systems by another truncation surface and associated slope of ca. 4 to 6 m. These discontinuities are suggested to have been formed between ca. 6000 and 1000 years B. P. Regarding the beach ridge systems identified a three phases evolutionary pattern is proposed, from an open-sea bay environment (Phase 1) to a semiprotected bay (Phase 2) and finally reaching a high grade of protection as evidenced by the genesis of the modern and partially raised tidal flat (Phase 3).Facultad de Ciencias Naturales y Muse

Landforms, molluscan and coastal evolution during the Holocene at Ensenada Ferrer (Santa Cruz, Patagonia, Argentine)

En este trabajo se propone un esquema evolutivo desde el Holoceno medio hasta el Presente del área costera de Ensenada Ferrer, ubicada al noreste de la Provincia de Santa Cruz, Argentina. Se aplicó el método morfocronológico para la definición de secuencias deposicionales cordoniformes, distinguiéndose dos sistemas y tres grupos, división que está avalada además por el contenido malacológico y características paleoambientales. Estos sistemas están separados entre sí por una superficie de truncamiento y desnivel asociado de 1,5 a 3 m. A su vez, se separan de un sistema más antiguo (Pleistoceno tardío?) por otra superficie de truncamiento con un desnivel asociado de 4 a 6 m. Se propone que estas discontinuidades se habrían originado entre ca. 6.000 y 1.000 años A.P. En relación con los sistemas de cordones identificados, se esboza un esquema evolutivo en tres fases, pasando el sector de ser una bahía abierta hacia el mar circundante (Fase 1), a una bahía semiprotegida (Fase 2), para finalmente alcanzar un alto grado de protección evidenciado por la conformación de la actual planicie de marea parcialmente ascendida (Fase 3)In this paper we attempt an interpretation of the geomorphological evolution since the Mid-Holocene of the coastal area of Ensenada Ferrer, located in the northeastern coastal area of Santa Cruz province, Argentina. The chronostratigraphical method was applied to distinguish between different beach ridges, discriminating between two beach ridge systems including one and two groups, respectively, supported by the molluscan content and palaeoenvironmental conditions. These systems are separated by a truncation surface and an associated slope of ca. 1.5 to 3 m. In turn, they are separated from innermost older (Late Pleistocene?) systems by another truncation surface and associated slope of ca. 4 to 6 m. These discontinuities are suggested to have been formed between ca. 6000 and 1000 years B. P. Regarding the beach ridge systems identified a three phases evolutionary pattern is proposed, from an open-sea bay environment (Phase 1) to a semiprotected bay (Phase 2) and finally reaching a high grade of protection as evidenced by the genesis of the modern and partially raised tidal flat (Phase 3).Facultad de Ciencias Naturales y Muse

Landforms, molluscan and coastal evolution during the Holocene at Ensenada Ferrer (Santa Cruz, Patagonia, Argentine)

En este trabajo se propone un esquema evolutivo desde el Holoceno medio hasta el Presente del área costera de Ensenada Ferrer, ubicada al noreste de la Provincia de Santa Cruz, Argentina. Se aplicó el método morfocronológico para la definición de secuencias deposicionales cordoniformes, distinguiéndose dos sistemas y tres grupos, división que está avalada además por el contenido malacológico y características paleoambientales. Estos sistemas están separados entre sí por una superficie de truncamiento y desnivel asociado de 1,5 a 3 m. A su vez, se separan de un sistema más antiguo (Pleistoceno tardío?) por otra superficie de truncamiento con un desnivel asociado de 4 a 6 m. Se propone que estas discontinuidades se habrían originado entre ca. 6.000 y 1.000 años A.P. En relación con los sistemas de cordones identificados, se esboza un esquema evolutivo en tres fases, pasando el sector de ser una bahía abierta hacia el mar circundante (Fase 1), a una bahía semiprotegida (Fase 2), para finalmente alcanzar un alto grado de protección evidenciado por la conformación de la actual planicie de marea parcialmente ascendida (Fase 3)In this paper we attempt an interpretation of the geomorphological evolution since the Mid-Holocene of the coastal area of Ensenada Ferrer, located in the northeastern coastal area of Santa Cruz province, Argentina. The chronostratigraphical method was applied to distinguish between different beach ridges, discriminating between two beach ridge systems including one and two groups, respectively, supported by the molluscan content and palaeoenvironmental conditions. These systems are separated by a truncation surface and an associated slope of ca. 1.5 to 3 m. In turn, they are separated from innermost older (Late Pleistocene?) systems by another truncation surface and associated slope of ca. 4 to 6 m. These discontinuities are suggested to have been formed between ca. 6000 and 1000 years B. P. Regarding the beach ridge systems identified a three phases evolutionary pattern is proposed, from an open-sea bay environment (Phase 1) to a semiprotected bay (Phase 2) and finally reaching a high grade of protection as evidenced by the genesis of the modern and partially raised tidal flat (Phase 3).Facultad de Ciencias Naturales y Muse

Acoustic and Thermal Analysis of Food

Exploring the food acoustic features can help to understand and effectively apply some preservation treatments that extend their expiration date. The food composition and properties are crucial issues in their acoustic behavior when stimulated with acoustic waves. If these waves are varied in frequency and intensity, the temperature of food could be affected facilitating the moisture removal or degrading its nutritional condition. Therefore, we presented a guide to determine and apply the most influential spectral component of ultrasound waves on apple and tomato when dehydrated in an ultrasound-assisted dehydration system. In this guide, applying the finite element method, we study, simulate, and analyze the acoustic and thermic behavior of apple and tomato inside a chamber when radiated with acoustic waves at (1 Hz, 1 MHz) by using up to three piezoelectric transducers. From the physical parameters defined in the simulation environment for apple and tomato, we find the relevant spectral components that can produce temperature changes in each food sample considering the radiation time and the food sample location. This work represents an analysis guide that allows for determining the best conditions for the acoustic radiation of foods, avoiding their structural and nutritional damage, and seeking the design of energy-efficient processes

Outer-disk reddening and gas-phase metallicities: The CALIFA connection

Based on observations collected at the German-Spanish Astronomical Center, Calar Alto, jointly operated by the Max-Planck-Institut für Astronomie Heidelberg and the Instituto de Astrofísica de Andalucía (CSIC ).CALIFA Team: et al.We study, for the first time in a statistically significant and well-defined sample, the relation between the outer-disk ionized-gas metallicity gradients and the presence of breaks in the surface brightness profiles of disk galaxies. Sloan Digital Sky Survey (SDSS) g′- and r′-band surface brightness, (g′ - r′) color, and ionized-gas oxygen abundance profiles for 324 galaxies within the Calar Alto Legacy Integral Field Area (CALIFA) survey are used for this purpose. We perform a detailed light-profile classification, finding that 84% of our disks show down- or up-bending profiles (Type II and Type III, respectively), while the remaining 16% are well fitted by one single exponential (Type I). The analysis of the color gradients at both sides of this break shows a U-shaped profile for most Type II galaxies with an average minimum (g′ - r′) color of ∼ 0.5mag and an ionized-gas metallicity flattening associated with it only in the case of low-mass galaxies. Comparatively, more massive systems show a rather uniform negative metallicity gradient. The correlation between metallicity flattening and stellar mass for these systems results in p-values as low as 0.01. Independent of the mechanism having shaped the outer light profiles of these galaxies, stellar migration or a previous episode of star formation in a shrinking star-forming disk, it is clear that the imprint in their ionized-gas metallicity was different for low- and high-mass Type II galaxies. In the case of Type III disks, a positive correlation between the change in color and abundance gradient is found (the null hypothesis is ruled out with a p-value of 0.02), with the outer disks of Type III galaxies with masses ≤10 M′ showing a weak color reddening or even a bluing. This is interpreted as primarily due to a mass downsizing effect on the population of Type III galaxies that recently experienced an enhanced inside-out growth.R. A. Marino is funded by the Spanish program of International Campus of Excellence Moncloa (CEI).We acknowledge support from the Plan Nacional de Investigación y Desarrollo funding programs, AyA2010-15081, AyA2012-30717 and AyA2013-46724P, of Spanish Ministerio de Economía y Competitividad (MINECO). A.G.d.P. acknowledges the support from the FP7 Marie Curie Actions of the European Commission, via the Initial Training Network DAGAL under REA grant agreement PITNGA-2011-289313. C.C.-T. thanks the support of the Spanish Ministerio de Educación, Cultura y Deporte by means of the FPU fellowship program. C.J.W. acknowledges support through the Marie Curie Career Integration Grant 303912. Support for L.G. is provided by the Ministry of Economy, Development, and Tourism’s Millennium Science Initiative through grant IC 120009, awarded to The Millennium Institute of Astrophysics, MAS. L.G. acknowledges support by CONICYT through FONDECYT grant 3140566. S.F.S. thanks the CONACYT-125180 and DGAPA-IA100815 projects for providing him support in this study. J.M.A. acknowledges support from the European Research Council Starting Grant (SEDmorph; P.I. V. Wild). P.P. is supported by FCT through the Investigador FCT Contract No. IF/01220/2013 and POPH/FSE (EC) by FEDER funding through the program COMPETE. He also acknowledges support by FCT under project FCOMP-01-0124-FEDER-029170 (Reference FCT PTDC/FISAST/3214/2012), funded by FCT-MEC (PIDDAC) and FEDER (COMPETE).Peer Reviewe