196,437 research outputs found
Entalina tetragona Brocchi 1814
No full textEntalina tetragona (Brocchi, 1814) Fig. 11 d–f Dentalium tetragonum Brocchi, 1814 (p. 627, pl. 15, fig. 26). Entalina tetragona (Brocchi) — Caprotti 1961 (p. 356, pl. 20, figs. 7–8); Di Geronimo 1974 (p. 153); Di Geronimo & Li Gioi 1980 (pl. 1, fig. 7; pl. 3, fig. 6). Entalina tetragona (Brocchi, 1814) — Robba 1968 (p. 505, pl. 39, fig. 6); Caprotti 1979 (p. 251, pl. 13, figs. 4–8); Pavia 1991 (p. 132, pl. 8, figs. 7–8); Barash & Danin 1992 (p. 229, fig. 233); Cossignani et al. 1992 (fig. 411); Poppe & Goto 1993 (p. 35, pl. 1, fig. 12); Petersen 2004 (p. 61, fig. 45); Repetto et al. 2005 (p. 358, bottom left fig.). Diagnostic characters. Rather thin, regularly curved shell; anal aperture roundly quadrangular; foot aperture roundly pentagonal; four distinct longitudinal ribs on younger stages; additional slightly weaker rib developing soon after dorsally; several fine riblets appearing on older stages. Larval shell: not available. Occurrence. Box-corer samples BC04 (8 specimens), BC05 (2), BC72 (6); cores BC04 (7), BC05 (5), BC21 (9), BC51 (4), BC72 (1). Maximum length: 8.5 mm. Distribution and habitat. Entalina tetragona ranges from Norway to the Caribbean, Cape Verde and the Mediterranean, including the Levantine basin; it was regarded as an exclusive characteristic element of VP (bathyal mud) biocoenosis dwelling on muddy bottoms at bathyal depths, being more frequent in the 400–600 m bathymetric interval (Di Geronimo 1979[a]; Di Geronimo & Bellagamba 1985; Barash & Danin 1992; Poppe & Goto 1993; Pons-Moyà & Pons 1999; Galil 2004). In the Santa Maria di Leuca CWC biotope, it was regarded as common in Gryphus-Isidella and mollusk mud thanatofacies (Rosso et al. 2010). Fossil record. The species appeared during Upper Miocene (Tortonian), being among the few still surviving Miocene taxa (Caprotti 1979); records are from Miocene of Italy, Poland, Hungary and Vienna basin; Pliocene of Italy; Pleistocene of Denmark, central and southern Italy (Monterosato 1872; Robba 1968; Caprotti 1979; Di Geronimo & Li Gioi 1980; Di Geronimo & Bellagamba 1985; Pavia 1991; Di Geronimo & La Perna 1997; Petersen 2004; Di Geronimo et al. 2005).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 pages 49-51, DOI: 10.11646/zootaxa.4186.1.1, http://zenodo.org/record/16528
Ductility evaluation of precast RC shear walls in Italian existing buildings
No full textThis paper investigates the seismic behaviour of structural RC shear walls made with precast panels according to several proprietary technologies to build existing structures. The study focuses on determining the maximum ductility of these construction systems through in-plane lateral thrust numerical simulations by means of FE analysis. The investigations are carried out on three types of precast constructions systems, each one characterized by its own details and reinforcements, used to construct many buildings in central Italy between the early 70′s and the late 80′s. For reference and comparison purposes a coeval cast-in-place shear wall has been also analysed. The ductility values obtained from the analyses show that the shear walls made with these techniques have a similar or, in some cases, grater ductility than the cast-in-place shear walls built in the same period. In detail the lowest value of ductility, equal to 3.42, has been obtained by the cast-in-place shear wall while ductility values in the range 4.15–6.29, have been obtained by the three precast RC assemblies. The results of this research may provide a support for the seismic vulnerability analysis of existing buildings constructed with precast RC shear walls and may supply information for the behaviour factors estimation of this type of structures
A combined experimental and computational study of halogen and hydrogen bonding in molecular salts of 5-bromocytosine
No full textAlthough natural or artificial modified pyrimidine nucleobases represent important molecules with valuable properties as constituents of DNA and RNA, no systematic analyses of the structural aspects of bromo derivatives of cytosine have appeared so far in the literature. In view of the biochemical and pharmaceutical relevance of these compounds, six different crystals containing proton-transfer derivatives of 5-bromocytosine are prepared and analyzed in the solid-state by single crystal X-ray diffraction. All six compounds are organic salts, with proton transfer occurring to the Nimino atom of the pyridine ring. Experimental results are then complemented with Hirshfeld surface analysis to quantitively evaluate the contribution of different intermolecular interactions in the crystal packing. Furthermore, theoretical calculations, based on different arrangements of molecules extracted from the crystal structure determinations, are carried out to analyze the formation mechanism of halogen bonds (XBs) in these compounds and provide insights into the nature and strength of the observed interactions. The results show that the supramolecular architectures of the six molecular salts involve extensive classical intermolecular hydrogen bonds. However, in all but one proton-transfer adducts, weak to moderate XBs are revealed by C-Br...O short contacts between the bromine atom in the fifth position, which acts as XB donor (electron acceptor). Moreover, the lone pair electrons of the oxygen atom of adjacent pyrimidine nucleobases and/or counterions or water molecules, which acts as XB acceptor (electron donor)
The Avidin-Nucleic Acids Nano Assemblies (ANANAS), as powerful molecular amplifiers in in vitro diagnostics
No full textReal-time optimization for a Digital Twin of a robotic cell with human operators
No full textIn this paper, we develop a Digital Twin (DT) for a cell with a robotic arm serving seven stations and assisted by a human operator. The lack of reliable predictions of human behaviours requires constant monitoring of the cell in order not to affect the degree of context-awareness, autonomy, and adaptability of a DT. This monitoring is carried out through a real-time simulation and optimization algorithm, which continuously produces near-optimal decisions for machines and efficient recommendations for human operators. The proposed approach is tested in a large computational campaign based on real-world data. The results show that the behaviour of the operator scarcely affects the performance of the cell at least in the considered settings
On computing the degree of convexity of polyominoes
No full textIn this paper we present an algorithm which has as input a convex polyomino P and computes its degree of convexity, defined as the smallest integer k such that any two cells of P can be joined by a monotone path inside P with at most k changes of direction. The algorithm uses space O(m + n) to represent a polyomino P with n rows and m columns, and has time complexity O(min(m, rk)), where r is the number of corners of P. Moreover, the algorithm leads naturally to a decomposition of P into simpler polyominoes
Immunohistologic diagnosis of pseudorabies (Aujeszky's disease)using monoclonal antibodies
No full textEffects of Intermittent Fasting on Brain Metabolism. Nutrients
No full textWe are facing an obesity epidemic, and obesity itself and its close companion, type 2 diabetes, are independent risk factors for neurodegeneration. While most medical treatments fail to induce a clinically meaningful improvement in neurodegenerative disorders, lifestyle interventions have emerged in the spotlight. A recently rediscovered approach is intermittent fasting (IF), which, compared to the classic caloric restriction regimens, limits only the time of eating, rather than the number of calories allowed per day. There is already a large amount of evidence from preclinical and clinical studies showing the beneficial effects of IF. In this review, we specifically focus on the effects of IF on brain metabolism. Key molecular players modified during IF and involved in its beneficial central effects (ketone bodies, BDNF, GABA, GH/IGF-1, FGF2, sirtuin-3, mTOR, and gut microbiota) are identified and discussed. Studies suggest that IF induces several molecular and cellular adaptations in neurons, which, overall, enhance cellular stress resistance, synaptic plasticity, and neurogenesis. Still, the absence of guidelines regarding the application of IF to patients hampers its broad utilization in clinical practice, and further studies are needed to improve our knowledge on the different IF protocols and long-term effects of IF on brain metabolism before it can be widely prescribed
A Campylobacter jejuni enteritis that baffles
No full textCampylobacter infection is one of the most frequent enteritis in developed countries and in most cases it features a self-limiting character. In some cases it shows severe clinical pictures and it requires antibiotic therapy. Cases of antibiotic resistance are emerging, especially against fluoroquinolone. The article presents a case of a 14-year-old boy with a febrile Campylobacter enteritis treated with ceftriaxone and cipro-floxacin with an immediate resolution of the symptoms. Ten days later, the boy still showed the same symptoms suggesting three hypotheses: 1) failure of Campylobacter's eradication; 2) abdominal abscess; 3) beginning of inflammatory bowel disease associated with a concomitant and confusing Campylobacter jejuni infection. Coproculture still showed the presence of Campylobacter, and the treatment with azithromycin was effective in eradicating the infection. Past history and complete negativity of inflammatory index and faecal calprotectin allowed an inflammatory bowel disease to be excluded
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