Search results for "PLASMA"
showing 10 items of 4043 documents
On the discreet spectrum of fractional quantum hydrogen atom in two dimensions
2019
We consider a fractional generalization of two-dimensional (2D) quantum-mechanical Kepler problem corresponding to 2D hydrogen atom. Our main finding is that the solution for discreet spectrum exists only for $\mu>1$ (more specifically $1 < \mu \leq 2$, where $\mu=2$ corresponds to "ordinary" 2D hydrogenic problem), where $\mu$ is the L\'evy index. We show also that in fractional 2D hydrogen atom, the orbital momentum degeneracy is lifted so that its energy starts to depend not only on principal quantum number $n$ but also on orbital $m$. To solve the spectral problem, we pass to the momentum representation, where we apply the variational method. This permits to obtain approximate analytica…
Characterizing and Quantifying Frustration in Quantum Many-Body Systems
2011
We present a general scheme for the study of frustration in quantum systems. We introduce a universal measure of frustration for arbitrary quantum systems and we relate it to a class of entanglement monotones via an exact inequality. If all the (pure) ground states of a given Hamiltonian saturate the inequality, then the system is said to be inequality saturating. We introduce sufficient conditions for a quantum spin system to be inequality saturating and confirm them with extensive numerical tests. These conditions provide a generalization to the quantum domain of the Toulouse criteria for classical frustration-free systems. The models satisfying these conditions can be reasonably identifi…
Gap junction intercellular communication (GJIC) is regulated by plasmalogens in retinal macroglial cells
2019
International audience
Charge fluctuations and electric mass in a hot meson gas
2006
Net-Charge fluctuations in a hadron gas are studied using an effective hadronic interaction. The emphasis of this work is to investigate the corrections of hadronic interactions to the charge fluctuations of a non-interacting resonance gas. Several methods, such as loop, density and virial expansions are employed. The calculations are also extended to SU(3) and some resummation schemes are considered. Although the various corrections are sizable individually, they cancel to a large extent. As a consequence we find that charge fluctuations are rather well described by the free resonance gas.
The closure of Pak1-dependent macropinosomes requires the phosphorylation of CtBP1/BARS
2007
Membrane fission is an essential process in membrane trafficking and other cellular functions. While many fissioning and trafficking steps are mediated by the large GTPase dynamin, some fission events are dynamin independent and involve C-terminal-binding protein-1/brefeldinA-ADP ribosylated substrate (CtBP1/BARS). To gain an insight into the molecular mechanisms of CtBP1/BARS in fission, we have studied the role of this protein in macropinocytosis, a dynamin-independent endocytic pathway that can be synchronously activated by growth factors. Here, we show that upon activation of the epidermal growth factor receptor, CtBP1/BARS is (a) translocated to the macropinocytic cup and its surroundi…
Interaction of glutamic-acid-rich proteins with the cGMP signalling pathway in rod photoreceptors.
1999
The assembly of signalling molecules into macromolecular complexes (transducisomes) provides specificity, sensitivity and speed in intracellular signalling pathways. Rod photoreceptors in the eye contain an unusual set of glutamic-acid-rich proteins (GARPs) of unknown function. GARPs exist as two soluble forms, GARP1 and GARP2, and as a large cytoplasmic domain (GARP' part) of the beta-subunit of the cyclic GMP-gated channel. Here we identify GARPs as multivalent proteins that interact with the key players of cGMP signalling, phosphodiesterase and guanylate cyclase, and with a retina-specific ATP-binding cassette transporter (ABCR), through four, short, repetitive sequences. In electron mic…
Il cappero di Linosa: aspetti colturali e individuazione di biotipi spontanei per utilizzazioni produttive
2008
Linosa, isola dell'arcipelago delle Pelagie, vanta un'antica tradizione agricola basata su sistemi colturali tradizionali legati a poche colture agrarie (ortive, vite, cappero, ecc.). Per salvaguardare e valorizzare tali produzioni, il Consorzio Co.Ri.S.S.I.A. di Palermo ha intrapreso uno studio sul cappero linosano (Capparis spinosa L. subsp. rupestris). La prova è stata condotta somministrando schede-questionario ad un campione rappresentativo di produttori di cappero locali unitamente ad indagini esporative sul territorio. Sono state individuate 7 accessioni di cappero su cui sono stati condotti rilievi morfo-biometrici e produttivi. In questo lavoro si riportano i risultati delle schede…
Germoplasma di cultivar siciliane di nocciolo conservato dall’Orto Botanico di Palermo
2009
Recupero e caratterizzazione delle accessioni di ciliegio (Prunus avium l.) del germoplasma autoctono della calabria
2011
Innovazione varietale, genotipi tradizionali e qualità dei frutti nella melicoltura siciliana
2019
L’obiettivo di questo lavoro è stato quello di valutare, dal punto di vista pomologico e sensoriale, varietà di melo tradizionali e nuovi cloni, entrambi coltivati nel territorio collinare siciliano. Più precisamente abbiamo studiato le performance qualitative di mele del germoplasma siciliano e quello di frutti provenienti da programmi di innovazione varietale che ancora sono in via di osservazione per una eventuale diffusione sul territorio nell’ambito di progetti ministeriali specifici (Farina et al., 2009; Gregori et al., 2015). Lo studio si è basato su analisi chimico-fisiche e panel test applicate alla raccolta commerciale.