Search results for "COPP"

Pyrolysis-GC-MS and CuO-oxidation-HPLC in the characterization of HMMs from sediments and surface waters downstream of a pulp mill

1998

Abstract High molecular mass fractions of lignin and humic compounds in sediments and waters downstream of a pulp mill were characterized applying pyrolysis-gas chromatography-mass spectrometry. The results were compared to those obtained using reversed phase HPLC on the cupric oxide oxidation products. The chromatographic data of both pyrolysis and cupric oxide oxidation were also subjected to the principal component analysis (PCA). The sediment samples and fractions obtained by ultrafiltration of river water samples were freeze dried prior to characterization. The sediment samples were also extracted using 2 M sodium hydroxide solution. The extracts were ultrafiltrated, freeze dried and c…

Expression of a vegetative-storage-protein gene from Arabidopsis is regulated by copper, senescence and ozone

2001

Emerging data suggest that the mechanisms regulating plant copper homeostasis could be implicated in stress and senescence signal transduction pathways. To gain insight into copper-modulated patterns of gene expression, copper-treated Arabidopsis thaliana (L.) Heynh. plants were analysed by mRNA differential display. The experimental conditions were selected using aggregation of ribulose-1,5-bisphosphate carboxylase-oxygenase (Rubisco) as a molecular sensor to monitor copper-induced oxidative stress. Two copper-induced messengers encoding a vegetative storage protein (VSP2) were isolated by this technique. Both clones differed in the length of their 3'-untranslated region according to the p…

Gli scenari della paternità nella psicologia contemporanea. Sfide, fragilità, orizzonti

2019

La famiglia contemporanea si fonda su una diversa idea di genitorialità, le cui funzioni sono condivise all’interno della coppia parentale, che co-costruisce la propria rappresentazione e il proprio significato dell’essere genitori. La figura paterna e i suoi codici sono interessati, conseguentemente, da un continuo processo di rielaborazione, che ridefinisce, essendone a sua volta influenzato, le relazioni familiari orizzontali e intergenerazionali. I padri di oggi, tuttavia, nonostante siano sempre più attenti agli aspetti espressivi nel relazionarsi con i figli, possono apparire smarriti di fronte ad una trasformazione che li trova spesso impreparati e che tende ad essere svalutata socia…

Neopadri ipermoderni: la transizione alla paternità e la sintomatologia depressiva perinatale

2019

La transizione alla genitorialità è uno degli eventi critici del ciclo vitale della famiglia maggiormente indagati in ambito clinico e psicosociale; rappresenta un fondamentale rito di passaggio all’età adulta, caratterizzato dalla scelta più o meno consapevole di avere un bambino (Molgora, Saita e Fenaroli, 2010). Generalmente, la letteratura in ambito clinico così come gli studi psicoanalitici sui primi anni di vita e quelli sull’attaccamento (Bowlby, 1972; 1980; Ainsworth, 2006; Main, 2008) hanno rivolto maggiormente l’attenzione alla donna, approfondendo le dinamiche della relazione madre-bambino e trascurando la figura del padre. Oggi però, risulterebbe inappropriato affrontare queste …

The Impact of Humic Substances as Remediation Agents to the Speciation Forms of Metals in Soil

2013

Abstract Humic substances (HS) are the most widespread group of organic substances in natural environment and have high stability. The main terrestrial reserves are found in the form of naturally occurring ore, peat or lignite. The aim of this paper is to study possibilities to use HS as agents for remediation of contaminated with heavy metals soil and impacts of HS of metal speciation forms in it. It has been proved that HS are able to bind to metal ions and change their speciation forms in soils. The ability to form complexes with metal ions depends on the type of soil, type of metal, as well as concentrations of HS in soil. The study was carried out in experimental conditions and analyti…

Coppie miste ed educazione interculturale

2014

Production of dianionic and trianionic noble metal clusters in a Penning trap

2003

Abstract Metal clusters, Aun−, Agn−, and Cun−, from a laser vaporization source are transferred to a Penning trap and subjected to a bath of simultaneously stored electrons. After some reaction period multiply charged anionic gold, silver, and copper clusters are observed if the clusters under investigation are large enough. The cluster sizes for the onset of the formation of dianions and trianions are compared to a charged sphere model. The description of the experimental findings is largely improved if the repulsive Coulomb barrier is taken into account which prevents autodetachment of the surplus electrons on the experimental time scale of a second.

Bioactive Co(II), Ni(II), and Cu(II) Complexes Containing a Tridentate Sulfathiazole-Based (ONN) Schiff Base

2021

New Co(II), Ni(II), and Cu(II) complexes were synthesized with the Schiff base ligand obtained by the condensation of sulfathiazole with salicylaldehyde. Their characterization was performed by elemental analysis, molar conductance, spectroscopic techniques (IR, diffuse reflectance and UV–Vis–NIR), magnetic moments, thermal analysis, and calorimetry (thermogravimetry/derivative thermogravimetry/differential scanning calorimetry), while their morphological and crystal systems were explained on the basis of powder X-ray diffraction results. The IR data indicated that the Schiff base ligand is tridentate coordinated to the metallic ion with two N atoms from azomethine group and thiazole ring a…

Copper radiopharmaceuticals for theranostic applications

2018

The growing advancement in nuclear medicine challenges researchers from several different fields to integrate imaging and therapeutic modalities in a theranostic radiopharmaceutical, which can be defined as a molecular entity with readily replaceable radioisotope to provide easy switch between diagnostic and therapeutic applications for efficient and patient-friendly treatment of diseases. For such a reason, the diagnostic and therapeutic potential of all five medical radionuclides of copper have thoroughly been investigated as they boost the hope for development of successful radiotheranostics. To facilitate the mutual understanding between all different specialists working on this multidi…

A 18F-labeled dibenzocyclooctyne (DBCO) derivative for copper-free click labeling of biomolecules

2016

The new prosthetic group 18F-TEG-DBCO (dibenzocyclooctyne) can be prepared within a total reaction time of 60 min including purification with an overall yield (n.d.c.) of 34 ± 5%. Copper-free click cycloadditions with an azido-cRGD, a folate-azide and two α-MSH analogue azido-peptides resulted in very high RCYs and fast reaction kinetics.