Chain-like uranyl-coordination polymer as a bright green light emitter for sensing and sunlight driven photocatalysis

A new uranyl-coordination polymer (UCP) has been solvothermally synthesized employing succinic acid and 1,10-phenanthroline (phen) as ligands. The obtained compound with the formula [(UO2)2(phen)(succ)0.5(OH)(O)4(μ3-O)(H2O)]·H2O (UNSL-1) is classified as 1D chains showing I0O1 connectivity. Also, the asymmetric unit is composed of two hepta-coordinated uranyl centers: U1 is surrounded by five oxygen atoms from succinate, while U2 is surrounded by two nitrogen atoms from phen and three oxygen atoms from succinate ([U1O7] and [U2N2O5]). The secondary-building unit (SBU) is composed of a sharing edge tetrameric cluster linked with a succinate ligand in the [-1 0 1] direction. Besides, the chains are reinforced by π-π stacking interactions between the aromatic rings of the phen molecules to conform a 2D supramolecular arrangement. Moreover, photoluminescence experiments show strong green emission consistent with uranyl crystalline materials. Photophysical characterization was completed via low-temperature measurements (77 K) and recording the decay emission for calculating the lifetime (τobs) value. Regarding its multifunctional properties, a cation-sensing performance was achieved showing selective quenching toward iron ions in aqueous media. Finally, UNSL-1 was tested as an efficient water photocatalyst for dye degradation under simulated sunlight irradiation, exhibiting promising results for organic-pollutant water remediation.Fil: Gomez, Germán Ernesto. Universidad Nacional de San Luis. Facultad de Química, Bioquímica y Farmacia. Departamento de Química; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Luis. Instituto de Investigaciones en Tecnología Química. Universidad Nacional de San Luis. Facultad de Química, Bioquímica y Farmacia. Instituto de Investigaciones en Tecnología Química; ArgentinaFil: Onna, Diego Ariel. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Química, Física de los Materiales, Medioambiente y Energía. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Química, Física de los Materiales, Medioambiente y Energía; Argentina. Universidad Nacional de San Martin. Instituto de Nanosistemas; ArgentinaFil: D'vries, R. F.. Universidad del Cauca; ColombiaFil: Barja, Beatriz Carmen. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Química, Física de los Materiales, Medioambiente y Energía. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Química, Física de los Materiales, Medioambiente y Energía; ArgentinaFil: Ellena, Javier Alcides. Universidade de Sao Paulo; BrasilFil: Narda, Griselda Edith. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Luis. Instituto de Investigaciones en Tecnología Química. Universidad Nacional de San Luis. Facultad de Química, Bioquímica y Farmacia. Instituto de Investigaciones en Tecnología Química; Argentina. Universidad Nacional de San Luis. Facultad de Química, Bioquímica y Farmacia. Departamento de Química; ArgentinaFil: Soler Illia, Galo Juan de Avila Arturo. Universidad Nacional de San Martin. Instituto de Nanosistemas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentin

Incidence of Histoplasmosis in a Cohort of People with HIV: From Estimations to Reality

Among people with HIV, histoplasmosis represents an important cause of mortality. Previous studies provided estimates of the disease incidence. Here, we compared those estimates with the results obtained from a screening program implemented in Guatemala, which included histoplasmosis detection for people with HIV. To compare the results of this program with previous estimations, a literature search was performed and reports concerning histoplasmosis incidence were analyzed. The screening program enrolled 6366 patients. The overall histoplasmosis incidence in the screening program was 7.4%, which was almost double that estimated in previous studies. From 2017 to 2019, the screening program showed an upward trend in histoplasmosis cases from 6.5% to 8.8%. Histoplasmosis overall mortality among those who were newly HIV diagnosed showed a decrease at 180 days from 32.8% in 2017 to 21.2% in 2019. The screening approach using rapid diagnostic assays detects histoplasmosis cases more quickly, allowing a specific treatment to be administered, which decreases the mortality of the disease. Therefore, the use of these new techniques, especially in endemic areas of histoplasmosis, must be implemented.This work was supported by Global Action Fund for Fungal Infections and JYLAG, a charity Foundation based in Switzerland (E.A. received this funding under the proposal: “Minimising HIV deaths through rapid fungal diagnosis and better care in Guatemala”). Other contributions came from Intrahealth International and the Ministry of health in Guatemala (MSPAS).S

Cultural and leadership predictors of corporate social responsibility values of top management: A GLOBE study of 15 countries.

This paper examines cultural and leadership variables associated with corporate social responsibility values that managers apply to their decision-making. In this longitudinal study, we analyze data from 561 firms located in 15 countries on five continents to illustrate how the cultural dimensions of institutional collectivism and power distance predict social responsibility values on the part of top management team members. CEO visionary leadership and integrity were also uniquely predictive of such values. Journal of International Business Studies (2006) 37, 823–837. doi:10.1057/palgrave.jibs.8400230

Improved microwave digestion procedure for inductively coupled plasma mass spectrometric determinations of inorganic bromide residues in foodstuffs fumigated with methyl bromide

An improved microwave digestion procedure is described for the inductively coupled plasma mass spectrometric (ICP-MS) determination of inorganic bromide residues in foodstuffs fumigated with methyl bromide. It is based on the addition to the usual acid oxidizing mixture of small amounts of silver ions which cause bromides from the mineralized matrix to precipitate as sparingly soluble AgBr, thus, avoiding losses due to their conversion into Volatile products. The silver bromide precipitate separated from the digested sample is dissolved with ammonia and the cationic complex [Ag(NH3)(2)](+) thus formed is removed on a cation-exchange column. The resulting solution is finally acidified and added with indium internal standard, to make it suitable for inductively coupled plasma mass spectrometric (ICP-MS) analysis. This modified procedure has been tested for the analysis of synthetic KBr samples by obtaining totally satisfactory results, in that bromide recoveries ranging from 98.6 to 100.2% were found, with an overall standard deviation of 5.17%. Its application to the bromide determination in some mushroom samples is reported and the results found are compared with those obtained on the same samples mineralized by conventional alkali fusion. The proposed procedure can be extended to the determination in biological samples of other anions which may be lost during a conventional acid oxidizing microwave mineralization, but are able to form insoluble silver salts

How interpersonal motives explain the influence of organizational culture on organizational productivity, creativity, and adaptation: The ambidextrous interpersonal motives (AIM) model of organizational culture

Despite decades of research on organizational culture, the current literature lacks an orienting paradigm by which research findings can be accumulated regarding specific cultural forms' influence on specific organizational outcomes. This paper introduces an AIM (ambidextrous interpersonal motives) model of organizational culture. First, drawing on literature from both individual psychology and social anthropology, we suggest that organizational culture can be understood through a framework of interpersonal motives (cooperation, competition, and autonomy). Second, we extend research on organizational ambidexterity to describe both pure and hybrid forms of interpersonally based organizational culture. Third, we suggest that pure forms of culture have consequences for individual achievement and citizenship, with unclear implications for higher level outcomes, while combinations of cultural motives (hybrid forms) have positive consequences for higher level outcomes such as organizational productivity, creativity, and adaptation. Fourth, we address the importance of subcultures and temporal considerations in the model with regard to organizational viability and overall performance. Finally, we outline the theoretical and practical implications for future research in organizational culture