416 research outputs found
Eretmocerus iulii Laudonia et Melone sp. n.: parasitoid associated with Aleurocanthus spiniferus
No full textA meticulous study has led to description and identification of a novel member of the aphelinid genus Eretmocerus as a species
associated with nymphs of the orange spiny whitefly, Aleurocanthus spiniferus (Quaintance) (Hemiptera Aleyrodidae). The detailed
morphological analysis of the parasitoid has revealed distinctive characteristics that differentiate it from known species within the
genus. Molecular analysis has been conducted to provide additional evidence to the morphological analyses. Molecular data obtained
from DNA sequencing of the mitochondrial COI and 28S ribosomal genes has been compared with sequences from existing
databases, revealing a genetic divergence from other available Eretmocerus species and genetically defining the studied entity. The
integrated methodology employed in this study enabled the delineation of a new species within the Eretmocerus serius Silvestri
group, Eretmocerus iulii Laudonia et Melone sp. n. (Hymenoptera Aphelinidae)
{1,2}-semi-affine planar spaces.
No full textLet (S,L) be a finite linear space, that is, a finite set S whose elements we call points, and L a family of parts in S, whose elements we call lines, such that any line has at least two points, two distinct points are contained in just one line and |L|≥2. A subspace in (S,L) is a subset S′ in S such that for any X,Y∈S′, X≠Y, the line joining them belongs to S′. Suppose a family P of subspaces in (S,L) exists such that |P|≥2, every π∈P contains three noncollinear points and through three noncollinear points there is only one element of P. The triple (S,L,P) is called a planar space; the elements of P are called planes. Let (X,l) be a pair consisting of a point X∈S and a line l∈L with X∉l; let π(X,l) be the number of lines on X not meeting l and let H:={π(X,l):X∈S, l∈L, X∉l}. (S,L) is also called an H-semiaffine plane. Let n+1 be the maximum number of lines on a point; then the integer n is called the order of (S,L,P). In this paper the following result is proved: Let (S,L,P) be a finite planar space such that every plane of P is a {1,2}-semiaffine plane of order ≥5 and n+1 is the number of planes through every line of L. Then (S,L,P) is one of the following examples:(a) PG(3,n)∖π; (b) PG(3,n)∖{π∪X}, with X∉π; (c) PG(3,n)∖{π∪l}, with l⊄π; (d) PG(3,n)∖{π∪π′}, where X, l, π are a point, a line, and a plane of PG(3,n), respectively, and π′ is a plane of PG(3,n) different from π
Spongelike Functional Materials fromTEMPO-Oxidized Cellulose Nanofibers
No full textThe cleavage of the hierarchical structure of plant cellulose provides nanocellulose (NC), an attractive renewable nanomaterial for advanced applications. The presence of carboxylic acid moieties renders 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO)-oxidized cellulose nanofibers (TOCNF) particularly appealing for the synthesis of cellulose-based polymers with suitable cross-linkers. This chapter aims to provide an overview on the synthesis of bPEI-TOCNF sponges and their possible application fields. The high specific content of amino groups in bPEI-TOCNF makes them very suitable for environmental applications. The nanostructuring of cellulose nanofibers can also represent a useful synthetic tool for the preparation of different families of organic and inorganic aerogels. The cross-linking of TOCNF, in the presence of polyamines, provides a simple and cheap thermal procedure for the production of nanostructured aerogels from polysaccharide renewable sources. The ecofriendly nature of the engineered nanostructured materials opens the route for the development of sustainable and ecosafe nanoremediation, overcoming the issues related to the use of nanosized technologies
A characteristic property of the Grassmann manifold representing the lines of a projective space.
No full textThis paper is devoted to a characterization of the Grassmannian geometry of a projective space. The following result is proved: Let (P,L) be a partial linear space which is not linear and whose lines are not maximal singular subspaces. Suppose (P,L) has a covering Σ by maximal singular subspaces such that, for each S∈Σ and each pP−S , (1) the set of points of S collinear with p is a line L , (2) every element T of Σ through p intersects S in a unique point, and (3) each point of L belongs to an element of Σ through p . Then (P,L) is isomorphic to the Grassmannian space of a projective space.
As a corollary, the authors extend to infinite spaces a characterization of Grassmannian spaces considered as Γ -spaces, which has been established by P. M. Lo Re and Olanda in the finite cas
OVOIDAL LINEAR SPACES
No full textAbstractIn this paper a suitable definition of ovoid in linear spaces is given and a characterization of the Galois space PG(3,q) as a finite linear space containing an ovoid is obtained
Pseudoproduct spaces and C. Segre's varieties
No full textThe authors introduce the notion of pseudoproduct space as a particular type of projective partial
line space. Pseudoproduct spaces are studied in detail and a characterization is given for pseudoproduct spaces which satisfy a suitable regularity condition. The study leads to an interesting
graphic characterization of C. Segre’s varieties
Embedding semilinear and linear spaces in Grassmann spaces
No full textIn questo si articolo introduce la nozione di immersionedebole generalizzata per caratterizzare i sottospazi di G rassrnann Q (H)di spazi di Grassmann Q(K), con H sottocorpo del corpo K
Solatisonax bannocki Melone & Taviani 1980
No full textSolatisonax bannocki (Melone & Taviani, 1980) Fig. 16 l–n Architectonica bannocki Melone & Taviani, 1980 (p. 97, figs. 1–2). Solatisonax bannocki (Melone & Taviani, 1980) —Melone & Taviani 1984 (p. 157, figs. 12–1); Repetto et al. 2005 (p. 224, bottom right fig.). Diagnostic characters. Low-spired, almost discoidal shell; weak subsutural shoulder giving the spire a somewhat step-like profile; markedly prosocline rhomboidal aperture; wide and very deep umbilicus bordered by a row of knobs; robust peripheral keel; numerous fine spiral threads cut into minute granules by dense radial striae. Protoconch: heterostrophic; about 2 whorls, the first deeply immersed; diameter about 800 µm; surface smooth; transition to the teleoconch marked by a thin, everted lip. Occurrence. Box-corer samples BC11 (2 specimens), BC67 (1), BC68 (1), BC70 (4), BC71 (1), BC72 (11). Maximum diameter: 10 mm. Distribution and habitat. Solatisonax bannocki is distributed in the western Mediterranean basin and in the nearby Atlantic, as far south as Cape Verde; it is a bathyal species dwelling on mud and probably associated with deep-water corals (Melone & Taviani 1980, 1984). The present occurrence could be the easternmost record of the species in the Mediterranean. Fossil record. Upper and Middle Pleistocene of Calabria and Sicily Channel (Melone & Taviani 1984).Published as part of Negri, Mauro Pietro & Corselli, Cesare, 2016, Bathyal Mollusca from the cold-water coral biotope of Santa Maria di Leuca (Apulian margin, southern Italy), pp. 1-97 in Zootaxa 4186 (1) on page 73, DOI: 10.11646/zootaxa.4186.1.1, http://zenodo.org/record/16528
Increased expression of the astrocytic glutamate transporter GLT-1 in the prefrontal cortex of schizophrenics
No full textMELONE M. and MATUTE C.: co-first author
ABSTRACT
To verify whether altered glial glutamate uptake contributes to the
reduced efficacy of glutamatergic transmission reported in the prefrontal cortex of
schizophrenics, we studied the expression of GLT-1, the transporter responsible for most
glutamate transport, in autoptic samples of prefrontal cortex using real time quantitative
RT-PCR, immunocytochemistry, and functional assays. GLT-1 mRNA levels in
medication-free patients were 2.5-fold higher than in controls, whereas they were
normal or reduced in patients treated with antipsychotics. We also observed a 4-fold
increase in L-[3H]-Glu uptake in Xenopus oocytes injected with mRNA from the prefrontal
cortex of a medication-free schizophrenic and a 2-fold increase in GLT-1 protein in
the same cortical area of another medication-free patient. Results suggest that GLT-1
mRNA, protein and function are increased in prefrontal cortex of schizophrenics
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