Search results for "Berg"
showing 10 items of 758 documents
Symmetric Surfaces with Many Singularities
2004
Abstract Let G ⊂ SO(4) denote a finite subgroup containing the Heisenberg group. In this paper we classify all such groups, we find the dimension of the spaces of G-invariant polynomials and we give equations for the generators whenever the space has dimension two. Then we complete the study of the corresponding G-invariant pencils of surfaces in ℙ3 which we started in Sarti [Sarti, A. (2000). Pencils of symmetric surfaces in ℙ3(C). J. Algebra 246:429–452]. It turns out that we have five more pencils, two of them containing surfaces with nodes.
Examples of Indexed PIP-Spaces
2009
This chapter is devoted to a detailed analysis of various concrete examples of pip-spaces. We will explore sequence spaces, spaces of measurable functions, and spaces of analytic functions. Some cases have already been presented in Chapters 1 and 2. We will of course not repeat these discussions, except very briefly. In addition, various functional spaces are of great interest in signal processing (amalgam spaces, modulation spaces, Besov spaces, coorbit spaces). These will be studied systematically in a separate chapter (Chapter 8).
Dos geófitos nuevos para la provincia de Alicante
2018
Se aportan datos sobre dos especies no mencionadas hasta la fecha en la provincia de Alicante, Hyacinthus orientalis y Sternbergia lutea. It is shown some data about two new taxa for the Alicante province, Hyacinthus orientalis and Sternbergia lutea.
Cytotoxic Activity and Composition of Petroleum Ether Extract from Magydaris tomentosa (Desf.) W. D. J. Koch (Apiaceae)
2015
The petroleum ether extract of Magydaris tomentosa flowers (Desf.) W. D. J. Koch has been analyzed by GC-MS. It is mainly constituted by furanocoumarins such as xanthotoxin, xanthotoxol, isopimpinellin, and bergaptene. Other coumarins such as 7-methoxy-8-(2-formyl-2-methylpropyl) coumarin and osthole also occurred. The antiproliferative activity of Magydaris tomentosa flower extract has been evaluated in vitro on murine monocye/macrophages (J774A.1), human melanoma (A375) and human breast cancer (MCF-7) tumor cell lines, showing a major activity against the latter.
Considerazioni tassonomiche e cariologiche sulle popolazioni siciliane di Sternbergia colchiciflora Waldst. & Kit. (Amaryllidaceae)
2004
A citotaxonomic study on two Sicilian populations of Sternbergia colchiciflora from Madonie and Mt. Etna was carried out. They show marked differences in their morphology and caryology.This suggests to treat them as two distinct taxa, but their correct taxonomic position needs further investigation on other populations of Sternbergia colchiciflora from Mediterranean area
Studies of narrow autoionizing resonances in gadolinium
2003
The autoionization (AI) spectrum of gadolinium between the first and second limits has been investigated by triple-resonance excitation with high-resolution cw lasers. A large number of narrow AI resonances have been observed and assigned total angular momentum J values. The resonances are further divided into members of AI Rydberg series converging to the second limit or other ''interloping'' levels. Fine structure in the Rydberg series has been identified and interpreted in terms of Jc j coupling. A number of detailed studies have been performed on the interloping resonances: These include lifetime determination by lineshape analysis, isotope shifts, hyperfine structure, and photoionizati…
Singular integrals on regular curves in the Heisenberg group
2019
Let $\mathbb{H}$ be the first Heisenberg group, and let $k \in C^{\infty}(\mathbb{H} \, \setminus \, \{0\})$ be a kernel which is either odd or horizontally odd, and satisfies $$|\nabla_{\mathbb{H}}^{n}k(p)| \leq C_{n}\|p\|^{-1 - n}, \qquad p \in \mathbb{H} \, \setminus \, \{0\}, \, n \geq 0.$$ The simplest examples include certain Riesz-type kernels first considered by Chousionis and Mattila, and the horizontally odd kernel $k(p) = \nabla_{\mathbb{H}} \log \|p\|$. We prove that convolution with $k$, as above, yields an $L^{2}$-bounded operator on regular curves in $\mathbb{H}$. This extends a theorem of G. David to the Heisenberg group. As a corollary of our main result, we infer that all …
SUITE D'AUTORE: ARCHITETTURA, DESIGN E TECNOLOGIA PER UNA MODERNA CULTURA DELL'OSPITALITA'
2008
Per comprendere a fondo l’insieme delle modificazioni che hanno interessato il territorio antropizzato nel corso dei secoli, occorre anche valutare quelle specifiche architetture che sono destinate all’ospitalità; in particolare occorre considerare le loro peculiarità concettuali, spaziali, funzionali e tecnologiche, che si sono lentamente modificate per garantire il raggiungimento di un alto livello qualitativo per l’accoglienza. Nel presente volume, l’esigenza di indagare nel campo dell’accoglienza e di ritrovare quei caratteri della ricerca scientifica che ne definiscono la storia, la tecnica, i materiali e non di meno le emozioni, diviene l’obiettivo che l’Autore vuole raggiungere. Il v…
Internazionalità e sviluppo locale di un'area intermedia
2013
Alla luce di della visione del documento “Progetto Aree Interne”, Ministero della Coesione Territoriale, il contributo vuole porre l’attenzione su alcuni comuni di un'area interna della Sicilia, in particolare della regione agrigentina, per indagare azioni finalizzate al perseguimento dello sviluppo locale degli stessi. I centri urbani individuati si presterebbero, pertanto, sulla scia di un fenomeno di “internazionalizzazione” che vede protagonista Cianciana, alla realizzazione di una rete di “alberghi diffusi” che possa innescare dinamiche di sviluppo locale, arginando il fenomeno dello spopolamento.
TP53 codon 72 polymorphism and cervical cancer
2009
Background Cervical cancer is caused primarily by human papillomaviruses (HPV). The polymorphism rs1042522 at codon 72 of the TP53 tumour-suppressor gene has been investigated as a genetic cofactor. More than 80 studies were done between 1998 and 2006, after it was initially reported that women who are homozygous for the arginine allele had a risk for cervical cancer seven times higher than women who were heterozygous for the allele. However, results have been inconsistent. Here we analyse pooled data from 49 studies to determine whether there is an association between TP53 codon 72 polymorphism and cervical cancer.Methods Individual data on 7946 cases and 7888 controls from 49 different st…