Appunti sulle dottrine socialiste nei loro rapporti col problema sociale / Costanzo Cagnola Milano : Tip. Bernardoni di C. Rebeschini e C., 1895

Appunti sulle dottrine socialiste nei loro rapporti col problema sociale / Costanzo Cagnola Milano : Tip. Bernardoni di C. Rebeschini e C., 1895 63 p. ; 25 cm

Alkyne Selective Hydrogenation with Mono- and Bimetallic- Anchored Catalysts

Partial hydrogenation of alkynes has industrial and academic relevance on a large scale; industries such as petrochemical, pharmacological and agrochemical use these compounds as raw material. Finding an economic, active and selective catalyst for the production of alkenes through partial hydrogenation of alkynes is thus an important challenge. Mono- and bimetallic catalysts (palladium, ruthenium and nickel) were synthetized by the incipient wetness technique using gamma alumina and an activated carbon as supports. The catalysts were characterized by inductively coupled plasma, hydrogen chemisorption, temperature-programmed reduction and X-ray photoelectronic spectroscopy (XPS). The objective of this work is to study 1-heptyne-selective hydrogenation using supported catalysts influenced by different factors: (a) pretreatment reduction temperature, (b) reaction temperature, (c) type of support, (d) metal loading, (e) precursor salt and (f) addition of a second metal to monometallic palladium catalyst. The Lindlar commercial catalyst, commonly used in these types of reactions, was used for comparative purposes. XPS technique allowed verifying that the presence of electron-deficient species on the catalyst surface with high metal loading affects the conversion and selectivity to the desired product. Nevertheless, the influence of geometrical effects and/or mixed active sites in the catalysts, as well as metal-metal and metal-support interactions, cannot be neglected

Activity and sulfur resistance of Rh(I) and Pd(II) complexes

Two complexes of Rh(I) and Pd(II) with chloride and tridecylamine ligands were obtained and characterized by Elementary Analysis and by XPS and FTIR spectroscopies. Complexes anchored on γ-Al2O3 were tested in the styrene semi-hydrogenation reaction carried out in the absence or presence of a sulfur poison. Although both low loaded catalysts were highly selective, the Pd(II) complex was three times more active than the Rh(I) complex. The rhodium complex was more sulfur resistant but less active than the palladium complex. Differences in conversion and sulfur resistance between both complexes could be related to electronic and/or geometric effects

Graphite oxide as a support for palladium and rhodium complexes, assessed as catalysts for the partial hydrogenation of 1-heptyne

Graphite oxide (GO) was used to anchor [PdCl2(TDA)2] and [RhCl(TDA)3] (TDA =NH2(CH2)12CH3) with 2wt % of metal load. Elemental analysis (EA), FTIR, XPS, XRD and atomic absorption spectroscopy (AA) were the techniques employed for characterization. FTIR and XRD revealed that both complexes were mainly immobilized on the GO surface. The partial hydrogenation of 1-heptyne was the test reaction to evaluate the catalytic behavior of these heterogenized complexes under mild conditions of temperature and pressure in a semi continuous process. The results were compared with those obtained with the Wilkinson catalyst under the same operational conditions. AA analysis revealed that there is no leaching of the complexes during the heterogeneous catalytic evaluations. [RhCl(TDA)3]/GO was the best catalyst due to electronic and steric effects as well as the influence of the support

Long-Day Photoperiod Enhances Jasmonic Acid-Related Plant Defense

[EN] Agricultural crops are exposed to a range of daylengths, which act as important environmental cues for the control of developmental processes such as flowering. To explore the additional effects of daylength on plant function, we investigated the transcriptome of Arabidopsis (Arabidopsis thaliana) plants grown under short days (SD) and transferred to long days (LD). Compared with that under SD, the LD transcriptome was enriched in genes involved in jasmonic acid-dependent systemic resistance. Many of these genes exhibited impaired expression induction under LD in the phytochrome A (phyA), cryptochrome 1 (cry1), and cry2 triple photoreceptor mutant. Compared with that under SD, LD enhanced plant resistance to the necrotrophic fungus Bottytis cinerea. This response was reduced in the phyA cry1 cry2 triple mutant, in the constitutive photomorphogenicl (cop1) mutant, in the myc2 mutant, and in mutants impaired in DELLA function. Plants grown under SD had an increased nuclear abundance of COP1 and decreased DELLA abundance, the latter of which was dependent on COP1. We conclude that growth under LD enhances plant defense by reducing COP1 activity and enhancing DELLA abundance and MYC2 expression.This study was supported by a Guggenheim Foundation fellowship (to J.J.C), by Agencia Nacional de Promocion Cientifica y Tecnologica (PICT-2015-1796), by the University of Buenos Aires (20020100100437, to J.J.C.), by the Howard Hughes Medical Institute (J.I.C.), and by the SIGNAT-Research and Innovation Staff Exchange (H2020-MSCA-RISE-2014, to P.D.C., M.A.B., D.A., and J.J.C.).Cagnola, J.; Cerdan, P.; Pacín, M.; Andrade, A.; Rodríguez, V.; Zurbriggen, M.; Legris, M.... (2018). Long-Day Photoperiod Enhances Jasmonic Acid-Related Plant Defense. PLANT PHYSIOLOGY. 178(1):163-173. https://doi.org/10.1104/pp.18.00443S163173178

Diversidad microbiana y productividad de tomate asociadas a la bioestimulación como estrategia de transición agroecológica

Se realizó un relevamiento de bacterias endófitas de tallo de cultivares de tomate (Lycopersicum esculentum) bajo cubierta con o sin tratamiento de bioestimulación en etapa de plantín, como estrategia para una transición agroecológica. La producción de tomate tardío y el rediseño de manejos para las coberturas fueron dos determinantes en este ensayo. Se determinó la capacidad bacteriana de promover el crecimiento vegetal in vitro y la productividad de los cultivos. No se encontró una relación directa entre la cantidad, diversidad y capacidad de promover el crecimiento vegetal de endófitos de tallo de tomate y la bioestimulación, características que estarían relacionadas al genotipo de tomate. El tomate platense mostró mayor biodiversidad de endófitos promotores del crecimiento vegetal que el hibrido BADRO y la variedad UCO, pero como línea genética, no resultó apropiada como cultivo de tomate tardío. En cambio, el hibrido BADRO y la variedad UCO mostraron buenos rendimientos y respondieron a la bioestimulación.A survey of endophytic bacteria from stem of tomato cultivars under cover with or without biostimulation treatment in seedling stage was realized as strategy for an agroecological transition. Late tomato production and the redesign of the handlings for hedges were two determinants in this assay. Its ability to promote plant growth in vitro was determined and crop productivity was evaluated. No direct relationship was found between the amount, diversity and ability to promote plant growth of tomato stem endophytes and biostimulation, but these features would be related to tomato genotype. The platense tomato showed a greater biodiversity of endophytes with plant growth promoting characteristics comparing to the BADRO hybrid and UCO variety, but as genetic line, it was not suitable for cultivation as late tomato. However, the BADRO hybrid and UCO variety showed good yields and responded to biostimulation.Eje A1 Sistemas de producción de base agroecológica (Trabajos científicos)Facultad de Ciencias Agrarias y Forestale

Photoreceptors UVR8 and phytochrome B cooperate to optimize plant growth and defense in patchy canopies

Light is a critical source of information for plants. Plants use the phytochromes (particularly phyB) to detect light signals associated with the proximity of competitors. A low ratio of red (R) to far-red (FR) radiation (R:FR) indicates increased competition intensity, and triggers morphological responses that allow the plant to escape shading from its neighbors (the shade avoidance syndrome, SAS). Recent evidence from studies on light regulation of plant immunity has suggested that plants may also use ultraviolet-B (UV-B, 290-315 nm) radiation as an indicator of competition intensity and light availability. In addition, recent studies have shown that UV-B radiation can strongly repress SAS responses triggered by low R:FR ratios. Ambient UV-B radiation causes damaging effects on plants, such as DNA damage, and also induces adaptive photomorphogenic responses acting through a specific UV-B photoreceptor (UVR8). Therefore, the possibility exists that plants integrate information perceived by phyB and UVR8 to make decisions about growth and defense when faced with a complex light environment, such as the one that characterizes vegetation canopies. In this Letter, we address this possibility and discuss how the interplay between UV-B and R:FR signaling fine tunes plant growth and defense to optimize resource utilization in patchy canopy environments.Fil: Mazza, Carlos Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura; ArgentinaFil: Ballare, Carlos Luis. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico La Plata. Instituto de Investigaciones Biotecnológicas - Instituto Tecnológico Chascomús. Instituto de Investigaciones Biotecnológicas (sede Chascomús); Argentin