168 research outputs found
Phase-selective growth of - vs -GaO and (InGa)O by In-mediated metal exchange catalysis in plasma-assisted molecular beam epitaxy
Its piezo- and potentially ferroelectric properties make the metastable kappa
polymorph of GaO an interesting material for multiple applications,
while In-incorporation into any polymorphs of GaO allows to lower their
bandgap. In this work, we provide a guideline to achieve single phase
-, -GaO as well as their (InGa)O
alloys up to x = 0.14 and x = 0.17 respectively, using In-mediated metal
exchange catalysis in plasma assisted molecular beam epitaxy (MEXCAT-MBE). The
polymorph transition from to is also addressed, highlighting
the fundamental role played by the thermal stability of the
-GaO. Additionally, we also demonstrate the possibility to grow
(01) -GaO on top of -AlO (0001) at
temperatures at least 100 {\deg}C above those achievable with conventional
non-catalyzed MBE, opening the road for increased crystal quality in
heteroepitaxy. The role of the substrate, as well as strain and structural
defects in the growth of -GaO is also investigated by growing
simultaneously on three different materials: (i) -AlO (0001),
(ii) 20 nm of (01) -GaO on -AlO (0001)
and (iii) (01) -GaO single crystal.Comment: Main text: 7 pages, 4 figures; Supplementary: 6 pages, 9 figure
Efficiency of DNA mini-barcoding to assess mislabeling in commercial fish products in italy: An overview of the last decade
The problem of fish traceability in processed products is still an important issue in food safety. Major attention is nowadays dedicated to consumer health and prevention of possible frauds regulated by national and international laws. For this reason, a technical approach is fun-damental in revealing mislabeling at different levels. In particular, the use of genetic markers has been standardized and DNA barcoding is considered the gold-standard strategy to examine and prevent species substitution. Considering the richness of available DNA databases, it is nowadays possible to rapidly reach a reliable taxonomy at the species level. Among different approaches, an innovative method based on DNA mini barcoding has recently been proposed at an international level. Starting from this evidence, we herein illustrate an investigation dealing with the evolution of this topic in Italy over the last decade. The molecular analysis of 71 commercial fish samples based on mini-COI sequencing with two different primer sets reached an amplification success rate of 87.3 and 97.2%. The investigation revealed four major frauds (5.8%) and four minor ones (5.8%). Results highlighted a decrease in incorrect labeling in Italy from 32% to 11.6% over the last decade, although a recurrent involvement of âendangeredâ species sensu IUCN was still observed
Renormalization: the observable-state model
The usual mathematical formalism of quantum field theory is non-rigorous
because it contains divergences that can only be renormalized by non-rigorous
mathematical methods. The purpose of this paper is to present a method of
subtraction of this divergences using the formalism of decoherence. This is
achieved by replacing the standard renormalization method by a projector on a
well defined Hilbert subspace. In this way a list of problems of the standard
formalism disappears while the physical results of QFT remains valid. From it
own nature, this formalism can be used in non-renormalizable theories.Comment: 23 page
Incidence of dental caries in primary dentition and risk factors: a longitudinal study
Notulae to the Italian alien vascular flora: 2
In this contribution, new data concerning the Italian distribution of alien vascular flora are presented. It includes new records, exclusions and confirmations for Italy or for Italian administrative regions for taxa in the genera Ageratum, Aster, Buddleja, Cedrus, Centranthus, Cephalotaxus, Clerodendrum, Cotoneaster, Cyperus, Honorius, Lantana, Ligustrum, Morus, Muscari, Oenothera, Opuntia, Platycladus, Plumbago, Pseudotsuga, Sedum, Sporobolus, Stachys, Ulmus and Yucca. A nomen novum, Stachys talbotii, is proposed as a replacement name for Sideritis purpurea
Notulae to the Italian alien vascular flora: 2
In this contribution, new data concerning the Italian distribution of alien vascular flora are presented. It includes new records, exclusions and confirmations for Italy or for Italian administrative regions for taxa in the genera Ageratum, Aster, Buddleja, Cedrus, Centranthus, Cephalotaxus, Clerodendrum, Cotoneaster, Cyperus, Honorius, Lantana, Ligustrum, Morus, Muscari, Oenothera, Opuntia, Platycladus, Plumbago, Pseudotsuga, Sedum, Sporobolus, Stachys, Ulmus and Yucca. A nomen novum, Stachys talbotii, is proposed as a replacement name for Sideritis purpurea
Notulae to the Italian native vascular flora: 3.
In this contribution new data concerning the distribution of native vascular flora in Italy are presented. It includes new records, exclusions, and confirmations to the Italian administrative regions for taxa in the genera Asplenium, Bolboschoenus, Botrychium, Chamaerops, Crocus, Galeopsis, Grafia, Helosciadium, Hieracium, Juniperus, Leucanthemum, Lolium, Medicago, Phalaris, Piptatherum, Potamogeton, Salicornia, Salvia, Seseli, Silene, Spiraea, Torilis and Vicia. Rhaponticoides calabrica is proposed as synonym novum of R. centaurium. Furthermore, new combinations in the genera Galatella and Lactuca are proposed
Notulae to the Italian alien vascular flora: 3
In this contribution, new data concerning the Italian distribution of alien vascular flora are presented. It includes new records, exclusions, confirmations, and status changes for Italy or for Italian administrative regions for taxa in the genera Acer, Amaranthus, Araujia, Aubrieta, Avena, Bidens, Calycanthus, Celtis, Elaeagnus, Eragrostis, Euonymus, Fallopia, Ficus, Hedera, Lantana, Ligustrum, Ludwigia, Morus, Oenothera, Opuntia, Oxalis, Parkinsonia, Paspalum, Paulownia, Platycladus, Pleuropterus, Rumex, Salvia, Senecio, Setaria, Syagrus, Tradescantia, Trifolium and Yucca. Furthermore, a new combination in the genus Vicia is proposed
An updated checklist of the vascular flora native to Italy
An updated inventory of the native vascular flora of Italy, providing details on the occurrence at regional level, is presented. The checklist includes 8195 taxa (6417 species and 1778 subspecies), distributed in 1092 genera and 152 families; 23 taxa are lycophytes, 108 ferns and fern allies, 30 gymnosperms and 8034 angiosperms. The taxa currently occurring in Italy are 7483, while 568 taxa have not been confirmed in recent times, 99 are doubtfully occurring in the country and 19 are data deficient. Out of the 568 not confirmed taxa, 26 are considered extinct or possibly extinct
Notulae to the Italian alien vascular flora: 1
In this contribution, new data concerning the Italian distribution of alien vascular flora are presented. It includes new records, exclusions, and confirmations for Italy or for Italian administrative regions for taxa in the genera Agave, Arctotheca, Berberis, Bidens, Cardamine, Catalpa, Cordyline, Cotoneaster, Dichondra, Elaeagnus, Eragrostis, Impatiens, Iris, Koelreuteria, Lamiastrum, Lantana, Ligustrum, Limnophila, Lonicera, Lycianthes, Maclura, Mazus, Paspalum, Pelargonium, Phyllanthus, Pyracantha, Ruellia, Sorghum, Symphyotrichum, Triticum, Tulbaghia and Youngia
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