196,967 research outputs found
Influence of water on the electroanalytical behaviour of (K,Na)HSO4 eutectic melt. Characterization of Hg32+.
No full textErrata corrige, 69 (1979) Author Index, p. 3
Lipids and glucose homeostasis upon metabolic challenge: extracellular matrix takes the stage
No full textEffectiveness of 10% povidone-iodine drying time before Peripheral Intravascular catheter insertion: preliminary results from and explorative quasi-experimental study.
No full textAIM: to investigate the effectiveness of 10% povidone-iodine after a 30-second or 2-minute drying time on microbial count reduction at the point of a Peripheral Intravascular Catheter (PIC) insertion. A quasi-experimental design was adopted. In total, 53 patients were enrolled, 25 were exposed to a 2-m drying time and 28 to a 30-s drying time. From the preliminary results of this study, no differences in the occurrence of contamination have emerged between patients receiving 30-s and 2-m drying time for 10% povidone-iodine solutions
Adsorption of L-lysine on zeolites: effect of different framework topology and different Si/Al ratio
No full textThe study of the ability of zeolites to adsorb amino acids is significant to improve the knowledge of
the interactions between these molecules and solid surfaces. This is of fundamental importance to
increase the level of understanding of much more complex systems and to select adsorbent materials
able to selectively capture amino acids from aqueous solutions.[1]
Zeolites are aluminosilicate materials characterized by regular crystalline structure with microporous
cavities which confer a high superficial area. The physico-chemical proprieties of zeolites depend on
the composition of their framework that consist of tetrahedral units of SiO4 and AlO4 and, in
particular, their ratio (SAR) characterizes the hydrophilic/hydrophobic behavior of the material.
Moreover, the different conformation and dimension of the internal channels and cages influence the
adsorption selectivity towards host molecules.[2] The ability of zeolites to adsorb biologically active
biomolecules such as amino acids is of particular interest in industrial biotechnology[3] due to the fact
that these adsorbent materials could be used as solid solvents to stabilize the different charged forms
of the amino acids.
In this study we tested the different adsorption capacity of zeolites L and ZSM-5 towards the
amino acid L-lysine. These zeolites were chosen since they present different framework, with 2D and
3D channels structures, and different pore dimensions. Moreover, for the zeolite ZSM-5, two
materials having different SAR were selected to study the effect of zeolite chemical composition on
the adsorption capacity. Kinetic and isothermal experiments were carried out at different L-lysine
initial concentrations to study the adsorption processes. The results show high capacity towards the
adsorption of L-lysine for every zeolite investigated. We found a higher capacity for zeolite L with
respect to ZSM-5. Moreover, zeolite ZSM-5 with greater SAR has shown less adsorption, probably
a cause of different surface charge. [1][4] Moreover, the results obtained by thermal analyses (TGDTG-
DTA) showed different interactions within the amino acid-zeolite adduct and different stability,
depending on the peculiarities of the zeolites studied. Further investigation of the refinements of X
ray powder diffraction patterns showed the adsorption sites, the orientation and the interactions of the
amino acid molecules within the zeolite channels.
This work allowed to improve the understanding of the formation and interactions of the adducts
that originate from the adsorption of amino acids on zeolites. The information obtained are useful for
separation of amino acids from complex mixtures.
[1] G. Beltrami, A. Martucci, L. Pasti, T. Chenet, M. Ardit, L. Gigli, M. Cescon, E. Suard,
ChemistryOpen 2020, 9(10), 978–982.
[2] A. Martucci, L. Pasti, N. Marchetti, A. Cavazzini, F. Dondi, A. Alberti, Micropor. Mesopor. Mat.
2012, 148(1), 174-183.
[3] K. Stückenschneider, J. Merz, and G. Schembecker, J. Phys. Chem. 2014, 118, 5810-5819.
[4] T. Chenet, A. Martucci, M. Cescon, G. Vergine, G. Beltrami, L. Gigli, M. Ardit, M. Migliori, E.
Catizzone, G. Giordano, L. Pasti, Micropor. Mesopor. Mat., 2021, 323, 111183
Environmental Impact on Male (In)Fertility via Epigenetic Route
No full textIn the last 40 years, male reproductive health-which is very sensitive to both environmental exposure and metabolic status-has deteriorated and the poor sperm quality observed has been suggested to affect offspring development and its health in adult life. In this scenario, evidence now suggests that epigenetics shapes endocrine functions, linking genetics and environment. During fertilization, spermatozoa share with the oocyte their epigenome, along with their haploid genome, in order to orchestrate embryo development. The epigenetic signature of spermatozoa is the result of a dynamic modulation of the epigenetic marks occurring, firstly, in the testis-during germ cell progression-then, along the epididymis, where spermatozoa still receive molecules, conveyed by epididymosomes. Paternal lifestyle, including nutrition and exposure to hazardous substances, alters the phenotype of the next generations, through the remodeling of a sperm epigenetic blueprint that dynamically reacts to a wide range of environmental and lifestyle stressors. With that in mind, this review will summarize and discuss insights into germline epigenetic plasticity caused by environmental stimuli and diet and how spermatozoa may be carriers of induced epimutations across generations through a mechanism known as paternal transgenerational epigenetic inheritance
Tòla, partecipazione al Concorso edito da Riva 1920 con il progetto di un tavolo che utilizza le briccole veneziane come materiale di base
No full textBusiness Strategy and Ownership: How Do They Affect Management Accounting Innovations and Risk Management in Large Firms in Italy
No full textThe paper contributes to Management Accounting and Control (MA&C) research by considering MA innovations, rather than concentrating on traditional issues, such as modern cost measurement and risk management techniques to understand Management Accounting practices (MAPs)
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