Tree-Ring Dates for the Maximum Little Ice Age Advance of Kaskawulsh Glacier, St. Elias Mountains, Canada

A dendroglaciological study at Kaskawulsh Glacier provides the first calendar dating of a Little Ice Age glacier advance in the northeast St. Elias Mountains of Yukon Territory. Ring series from white spruce trees, Picea glauca (Moench) Voss, that had been sheared, tilted, and killed by deposition of till at the glacier’s terminal moraine were cross-dated with a millennium-length ring-width chronology developed at a site near the south end of Kluane Lake, about 25 km north of the glacier forefield. Six cross-dated samples from two sites at Kaskawulsh Glacier suggest that the north lobe of the glacier reached its greatest Holocene extent in the mid-1750s. Additional limited data suggest that the east lobe may have reached its maximum extent somewhat earlier (ca. 1717). This chronology of Little Ice Age activity of Kaskawulsh Glacier is consistent with well-dated glacier chronologies from adjacent mountain ranges in coastal and interior Alaska. The results also demonstrate the potential to derive calendar dates from subfossil wood in the St. Elias Mountains that hitherto had been dated only with much lower precision, using radiocarbon techniques.L’étude dendroglaciologique du glacier Kaskawulsh fournit la première datation de calendrier de l’avancée glaciaire du petit âge glaciaire, dans le nord-est des montagnes St. Elias, territoire du Yukon. Les séries de cernes d’épinettes blanches, Picea glauca (Moench) Voss, qui avaient été abattues, inclinées et tuées par le dépôt de till à la moraine terminale du glacier, ont été contre-datées à l’aide d’une chronologie millénaire de largeur des cernes mise au point à un emplacement situé près du côté sud du lac Kluane, à environ 25 km au nord du front du glacier. Six échantillons contre-datés provenant de deux emplacements du glacier Kaskawulsh suggèrent que le lobe nord du glacier a atteint sa plus grande étendue holocène dans le milieu des années 1750. Par ailleurs, certaines données supplémentaires suggèrent que le lobe est pourrait avoir atteint son étendue maximale un peu plus tôt (vers 1717). Cette chronologie de l’activité du petit âge glaciaire du glacier Kaskawulsh coïncide avec les chronologies bien datées des chaînes de montagnes adjacentes, sur la côte et à l’intérieur de l’Alaska. Les résultats démontrent aussi la possibilité d’établir les dates de calendrier à partir de bois subfossile dans les montagnes St. Elias qui avait été daté avec beaucoup moins de précision jusqu’ici à l’aide de techniques de datation au carbone 14

Sensitivity of UV Erythemal Radiation to Total Ozone Changes under Different Sky Conditions: Results for Granada, Spain

This is the peer reviewed version of the following article: Antón, M.; et al. Sensitivity of UV Erythemal Radiation to Total Ozone Changes under Different Sky Conditions: Results for Granada, Spain. Photochemistry and Photobiology, 92(1): 215-219 (2016), which has been published in final form at http://dx.doi.org/10.1111/php.12539 . This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-ArchivingThis paper focuses on the analysis of the sensitivity of UV erythemal radiation (UVER) to variations of the total ozone column (TOC) under different sky conditions at Granada (southeastern Spain). The sensitivity is studied both in relative terms by means of the Radiation Amplification Factor (RAF) and in absolute terms using the Ozone Efficiency (OE). These two variables are determined for diverse sky conditions characterized by the cloud cover information given by a sky camera (in oktas) and the cloud optical depth (COD) estimated from global solar radiation measurements. As expected, in absolute terms, the TOC variations cause substantially smaller UVER changes during completely overcast situations than during cloud-free cases. For instance, the OE (SZA=30º, TOC=290 DU) decreases from 0.68 mW/m2 per unit of TOC (0 oktas) to 0.50 mW/m2 per unit of TOC (8 oktas). However, the opposite is observed when the analysis is performed in relative terms. Thus, the RAF (determined for SZA cases below 80º) increases from 1.1 for cloud-free cases (0 oktas) to 1.4 for completely overcast situations (8 oktas). This opposite behavior is also found when both RAF and OE are analyzed as functions of COD. Thus, while the OE strongly decreases with increasing COD, the RAF increases as COD increases.European Commission Horizon 2020 Research and Innovation Framework Programme through ACTRIS 2 project (H2020-INFRAIA-2014-2015-654109).Spanish Ministry of Economy and Competitiveness through projects CGL2011-29921-C02-01, CGL2013-45410-R, CGL2014-56255-C2-1-R.Andalusia Regional Government through projects P10-RNM-6299 and P12-RNM-2409

Tratamiento hidrotermal a baja temperatura de una toba rica en clinoptilolita en soluciones de NaOH, KOH y Ca (OH)2

Una toba rica en clinoptilolita natural del área volcánica del Mioceno de las Montañas Tokay de Hungría fue convertida en productos sintéticos de mayor valor agregado bajo condiciones hidrotérmicas. La clinoptilolita fue activada hidrotérmicamente con NaOH, KOH y Ca(OH) como agentes activantes para sintetizar productos de alta 2 pureza, los cuales incluyen zeolita Na-P1 (GIS), zeolita K-F (EDI) e hidróxidos y silicatos de calcio. Los productos sintéticos se caracterizaron por técnicas de difracción de rayos X, microscopia electrónica de barrido, espectroscopía infrarroja por transformada de Fourier y termogravimetría. Los resultados obtenidos en este estudio son importantes tanto para evaluar la influencia del agente activante sobre la formacion de nuevas fases zeoliticas como para similar las condiciones geológicas de formación de zeolitas y otras fases minerales

Morfología polínica de las especies de Ludwigia(Onagraceae, Ludwigioideae) del Noroeste de Argentina

Cecotti Álvarez, Mario D.; María E. García; Nora J. F. Reyes; Alberto C. Slanis. 2017. “Morfología polínica de las especies de Ludwigia (Onagraceae, Ludwigioideae) del Noroeste de Argentina”. Lilloa 54 (1). Se describe la morfología polínica de siete taxones del género Ludwigia (Onagraceae, Ludwigioideae) presentes en el noroeste de Argentina: L. bonariensis , L. decurrens , L. grandiflora ssp. hexapetala , L. major , L. octovalvis, L. peploides ssp. peploides y L. peruviana . Las observaciones y mediciones de granos de polen acetolizados y sin acetolizar se realizaron con microscopio óptico (MO) mientras que para los estudios con microscopio electrónico de barrido (MEB) se trabajó con granos no acetolizados. Los granos son suboblatos a oblatos, tricolporados y de simetría subisopolar, con poros prominentes, aspidados y se presentan en mónades (33-84 ?m) o reunidos en tétrades (52-102 ?m). Los hilos de viscina, característicos de la familia, se insertan principalmente en el polo proximal. Los colpos son estrechos y cortos o largos. La escultura de la exina varía de rugulada a rugulada – estriada fina. En algunos taxones se observan crestas meridionales y laterales. Se analizan diferencias palinológicas entre las entidades estudiadas y se ofrece una clave para su identificación

Segundo informe y evaluación del operativo de vacunación para el control de la fiebre aftosa en la Sabana de Bogotá, Valles de Ubaté y Chiquinquirá

Instituto Colombiano Agropecuario - ICAGanadería bovin

Glucocerebrosidase expression patterns in the non-human primate brain

Glucocerebrosidase (GCase) is a lysosomal enzyme encoded by the GBA1 gene. Mutations in GBA1 gene lead to Gaucher’s disease, the most prevalent lysosomal storage disorder. GBA1 mutations reduce GCase activity, therefore promoting the aggregation of alphasynuclein, a common neuropathological finding underlying Parkinson’s disease (PD) and dementia with Lewy bodies. However, it is also worth noting that a direct link between GBA1 mutations and alpha-synuclein aggregation indicating cause and effect is still lacking, with limited experimental evidence to date. Bearing in mind that a number of strategies increasing GCase expression for the treatment of PD are currently under development, here we sought to analyze the baseline expression of GCase in the brain of Macaca fascicularis, which has often been considered as the gold-standard animal model of PD. Although as with other lysosomal enzymes, GCase is expected to be ubiquitously expressed, here a number of regional variations have been consistently found, together with several specific neurochemical phenotypes expressing very high levels of GCase. In this regard, the most enriched expression of GCase was constantly found in cholinergic neurons from the nucleus basalis of Meynert, dopaminergic cells in the substantia nigra pars compacta, serotoninergic neurons from the raphe nuclei, as well as in noradrenergic neurons located in the locus ceruleus. Moreover, it is also worth noting that moderate levels of expression were also found in a number of areas within the paleocortex and archicortex, such as the entorhinal cortex and the hippocampal formation, respectively

Seasonal abundance of Diaphorina citri (Hemiptera: Liviidae) in citrus groves in Cazones, Veracruz, México

Se evaluó la abundancia estacional del Psílido Asiático de los Cítricos Diaphorina citri Kuwayama, en plantaciones de cítricos en la región de Cazones, Veracruz, México. Durante el período de Febrero de 2010 a Febrero de 2012 se realizaron registros quincenales de adultos de D. citri en trampas amarillas, así como la presencia de huevos, ninfas, adultos y enemigos  naturales en los brotes. Las poblaciones del psílido se presentaron durante todo el periodo de estudio, detectando picos poblacionales en Febrero, Marzo, Abril y Julio en las plantaciones. Los incrementos en las infestaciones del psílido mostraron una relación positiva con respecto a la abundancia de brotes, y éstos a su vez, con latemperatura y precipitación. Durante el periodo de estudio, los enemigos naturales no fueron un factor determinante en la regulación de las poblaciones del psílido, mientras que la abundancia de brotes en los árboles de cítricos, representa un factor clave en el manejo integrado de esta plaga.Seasonal abundance of the Asian Citrus Psyllid, Diaphorina citri Kuwayama, wasevaluated on citrus groves in the region of Cazones, Veracruz, Mexico. For the period from February 2010 to February 2012, biweekly records for adult specimens were made using yellow sticky cardboard traps, as well as the presence of eggs, nymphs, adults, and natural enemies on the flush shoots were also registered. Psyllid populations occurred throughout the period of study, detecting population peaks on February, March, April and July in the citrus plantations. Increases of psyllid infestations were positively related to the abundance of new shoot flushes, and these in turn, were related to the temperature and rainfall. Natural enemies were not a decisive factor in regulating liviid populations, while the abundance of shoot flushes produced by citrus treescould play an important role in integrated psyllid management

Sociodemographic and health predictors of concern about COVID-19 infection in Cuban patients with type 2 diabetes mellitus

Introduction: Concern about becoming infected is a particularly relevant psychological aspect in the context of a pandemic, as it is associated with social reactions and behavioral changes. Objectives: The present study sought to determine some sociodemographic and health factors associated with concern about COVID-19 infection in Cuban patients with type 2 diabetes mellitus. Methods: 203 patients with type 2 diabetes mellitus, who attended nine primary care areas of four Cuban provinces belonging to different regions of the country (65.52% female, mean age 57.5, SD=19.2), selected through non-probabilistic sampling, participated in the study. A sociodemographic questionnaire, the COVID-19 contagion concern scale (PRE-COVID-19) and an evaluation of blood glucose level were applied. Bivariate associations were examined with a series of analyses of variance (ANOVA). Adjusted (multiple) regression with all predictors running simultaneously was also used. Results: Bivariate analyses showed that age, sex, education, occupation, having comorbidities, and having a family member or friend who had COVID-19 were significantly related to COVID-19 contagion concern. However, when all variables were included simultaneously, only age, technical education, having comorbidities, and having a friend or family member who had COVID-19 remained significant predictors of concern about COVID-19 infection. Conclusions: Male patients, with a technical level of education, with comorbidities and those who had infected family members or friends presented greater concern for the contagion of COVID-19. The public health policies should develop strategies to assess the mental health of people belonging to vulnerable groups and provide interventions to promote mental health in those who show concern about infection

Internacionalización de la obra del artista Octavio Torres: Affordable Art Fair New York

Octavio Torres es un talentoso escultor nacido en Guadalajara, Jalisco el 10 de octubre de 1974. Escultor egresado de la escuela de artes plásticas del centro universitario de arte, arquitectura y diseño de la Universidad de Guadalajara años de 1994 - 1999. También egresó como restaurador de bienes muebles en la escuela de conservación y restauración de los años 2005-2010. Octavio cuenta con una especialización en conservación de monumentos de piedra hecha en Argentina y un diplomado en historia del arte mexicano. Las exposiciones más destacadas de Octavio han sido en el museo del premio nacional de cerámica en Tlaquepaque, Jalisco. Participó en Gallery Weekend en la Ciudad de México con una exposición titulada “Motor de impulso” y también participó en el Bienal de las Artes en la Habana, Cuba. Uno de los objetivos de Octavio es poder aumentar el número de espectadores, así como poder generar más contactos para comercializar un número mayor de esculturas. Los objetivos de Octavio son concretos y alcanzables ya que la feria nos da un amplio repertorio de contactos y puede lograr un alcance bastante grande con todas las personas que se encuentran viendo las obras. Lo que se busca es que Octavio pueda tener pedidos a futuro de personas interesadas en sus esculturas. Estamos seguros que su cartera de clientes va a crecer, desde personas que quieren las piezas para su hogar o personas que quieren sus piezas para hoteles o negocios.ITESO, A.C

Retrieval of aerosol profiles combining sunphotometer and ceilometer measurements in GRASP code

This is a preprint version of article accepted "Roman, A.; et al. Retrieval of aerosol profiles combining sunphotometer and ceilometer measurements in GRASP code. Atmospheric Research, 204: 161-177 (2018). DOI: https://doi.org/10.1016./j.atmosres.2018.01.021".In this paper we present an approach for the profiling of aerosol microphysical and optical properties combining ceilometer and sun/sky photometer measurements in the GRASP code (General Retrieval of Aerosol and Surface Properties). For this objective, GRASP is used with sun/sky photometer measurements of aerosol optical depth (AOD) and sky radiances, both at four wavelengths and obtained from AErosol RObotic NETwork (AERONET), and ceilometer measurements of range corrected signal (RCS) at 1064 nm. A sensitivity study with synthetic data evidences the capability of the method to retrieve aerosol properties such as size distribution and profiles of volume concentration (VC), especially for coarse particles. Aerosol properties obtained by the mentioned method are compared with airborne in-situ measurements acquired during two flights over Granada (Spain) within the framework of ChArMEx/ADRIMED (Chemistry-Aerosol Mediterranean Experiment/Aerosol Direct Radiative Impact on the regional climate in the MEDiterranean region) 2013 campaign. The retrieved aerosol VC profiles agree well with the airborne measurements, showing a mean bias error (MBE) and a mean absolute bias error (MABE) of 0.3 µm3/cm3 (12%) and 5.8 µm3/cm3 (25%), respectively. The differences between retrieved VC and airborne in-situ measurements are within the uncertainty of GRASP retrievals. In addition, the retrieved VC at 2500 m a.s.l. is shown and compared with in-situ measurements obtained during summer 2016 at a high-atitude mountain station in the framework of the SLOPE I campaign (Sierra Nevada Lidar AerOsol Profiling Experiment). VC from GRASP presents high correlation (r=0.91) with the in-situ measurements, but overestimates them, MBE and MABE being equal to 23% and 43%.This work was supported by the Andalusia Regional Government (project P12-RNM-2409) and by the “Consejería de Educación” of “Junta de Castilla y León” (project VA100U14); the Spanish Ministry of Economy and Competitiveness under the projects, CMT2015-66742-R, CGL2016-81092-R and “Juan de la Cierva-Formación” program (FJCI-2014-22052); and the European Union's Horizon 2020 research and innovation programme through project ACTRIS-2 (grant agreement no 654109) and the Marie Curie Rise action GRASP-ACE (grant agreement no 778349). The authors thankfully acknowledge the FEDER program for the instrumentation used in this work. COST Action TOPROF (ES1303), supported by COST (European Cooperation in Science and Technology), is also acknowledged