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Search Results: 1 - 10 of 219586 matches for " C. Galbiati "
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Domácias do cafeeiro beneficiam o ácaro predador Iphiseiodes zuluagai Denmark & Muma (Acari: Phytoseiidae)?
Matos, Cláudia H.C.;Pallini, Angelo;Chaves, Fredson F.;Galbiati, Carla;
Neotropical Entomology , 2004, DOI: 10.1590/S1519-566X2004000100011
Abstract: coffee plants have domatia on their leaves harboring mites, and the predatory mites can also use such structures. here we evaluated the effect of the domatia on the predatory mite iphiseiodes zuluagai denmark & muma, manipulating these structures on the leaves of coffea arabica l. var. catuaí. the tests were done using arenas made of coffee leaves placed up side down inside petri dishes. the survivorship of i. zuluagai was evaluated when released on leaves with closed domatia (t1); leaves with open domatia plus prey (t2) and leaves with open domatia without prey (t3). the experiment was checked every 24h, measuring the number of alive adults, oviposition site and the number of i. zuluagai eggs/treatment. significant difference was found between treatments. mites were alive until the end of the experiments on leaves with open domatia (t2 and t3), which did not happen on leaves with closed domatia (t1). the predators oviposited preferentially inside the domatia on treatments with open domatia, and on the edge of the leaves, next to the moist cotton bordering the leaves, on the treatment with closed domatia. the results indicate the role of domatia on the survivorship of the predators on the coffee plants, suggesting a possible mutualist interactions plant-predator. on coffee crops, a mutualistic plant-predator interaction mediated by domatia could be used in practices of natural biological control, selecting coffee plants with domatia to harbor predatory mites and thereby protecting plants against harmful herbivore mites.
A characterization of R, L, F, D, H-trivial quasi regular semigroups
Jolanda Laura Galbiati
Le Matematiche , 1996,
Abstract: See directly the article.
Time and space reconstruction in optical, non-imaging, scintillator-based particle detectors
Cristiano Galbiati,Kevin McCarty
Physics , 2005, DOI: 10.1016/j.nima.2006.07.058
Abstract: A new generation of ultra-low-background scintillator-based detectors aims to study solar neutrinos and search for dark matter and new physics beyond the Standard Model. These optical, non-imaging detectors generally contain a "fiducial volume" from which data are accepted, and an "active buffer region" where there are higher levels of radioactive contaminants. Events are observed in real time. To distinguish between events occurring in the two regions, it is imperative that event position reconstruction be well-understood. The object of this paper is the study of the reconstruction, in time and space, of scintillation events in detectors of large dimensions. A general, likelihood-based method of position reconstruction for this class of detectors is presented. The potential spatial resolution of the method is then evaluated. It is shown that for a spherical detector with a large number N of photosensitive elements that detect photons, the expected spatial resolution at the center of the detector is given by delta a ~ (c sigma / n) sqrt(3/N), where sigma is the width of the scintillator time response function and n is the index of refraction in the medium. However, if light in the detector has a scattering mean free path much less than the detector radius R, the resolution instead becomes (R/2) sqrt(3/N). Finally, a formalism is introduced to deal with the common case in which only the arrival time of the first photon to arrive at each photosensitive element can be measured.
A competitive multi-agent model of interbank payment systems
Marco Galbiati,Kimmo Soramaki
Computer Science , 2007,
Abstract: We develop a dynamic multi-agent model of an interbank payment system where banks choose their level of available funds on the basis of private payoff maximisation. The model consists of the repetition of a simultaneous move stage game with incomplete information, incomplete monitoring, and stochastic payoffs. Adaptation takes place with bayesian updating, with banks maximizing immediate payoffs. We carry out numerical simulations to solve the model and investigate two special scenarios: an operational incident and exogenous throughput guidelines for payment submission. We find that the demand for intraday credit is an S-shaped function of the cost ratio between intraday credit costs and the costs associated with delaying payments. We also find that the demand for liquidity is increased both under operational incidents and in the presence of effective throughput guidelines.
Indicadores físico-químicos e atividade antibacteriana de própolis marrom frente à Escherichia coli
Bastos, E.M.A.F;Galbiati, C;Loureiro, E.M;Scoaris, D.O;
Arquivo Brasileiro de Medicina Veterinária e Zootecnia , 2011, DOI: 10.1590/S0102-09352011000500032
Abstract: the activity of 23 samples of ethanolic brown propolis, from the state of mato grosso, was investigated against escherichia coli atcc 25922. the values of physical and chemical parameters showed significant variation among samples. the percentage of dry extract ranged from 2.6 to 27.6%. the index of oxidation varied from 3 to 519 seconds. all samples showed the percentage of wax higher than the limit preconized by the legislation, with values varying from 3.4 to 74.6%. the quantification of phenolic and flavonoid compounds, responsible for antimicrobial activity, ranged from 0.1 to 5.0 (w/w) and 0.02 to 0.66 (w/w), respectively, being that the higher the index of phenolic compounds the larger the zones of inhibition. antibacterial activity was observed in seven out of the 23 samples, demonstrating zones of inhibition ranging from 10 to 11.3mm. for these active samples, the minimum inhibitory concentration was determined, ranging from 125 to 1000mg/ml. the value of mic in 42.9% of these samples was 250mg/ml. these results contribute to the establishment of physical and chemical parameters for the regulation of brown propolis and indicate possible therapeutic applicability in the development of formulations for the treatment of infections caused by e. coli.
Comportamento de formigas (Hymenoptera: Formicidae) inquilinas de cupins (Isoptera: Termitidae) em pastagem
Carla Cristina Dutra,Carla Galbiati
EntomoBrasilis , 2009,
Abstract: O objetivo deste trabalho foi verificar o tipo de intera o entre formigas e os cupins os quais habitam o mesmo ninho. Os experimentos foram de duas maneiras: A- para testar a rela o de preda o, os tratamentos usados foram: três formigas e um cupim, três formigas e três cupins, e três formigas e doze cupins; B- para testar a rela o de prote o os tratamentos foram: três formigas e três cupins de um mesmo ninho e três formigas de um ninho diferente. Para verificar preda o foram testadas diferentes origens de formigas e cupins. Os testes foram em arenas e placas de Petri. Os comportamentos observados foram: n o responde; contato e abandono; agarra o cupim e luta. As espécies estudadas foram Camponotus sp. e Cornitermes silvestrii Emerson. No experimento A, nas arenas foi observado o comportamento de contato e abandono das formigas sobre um cupim significativamente diferente para formigas que n o co-habitava com o cupim, já para um grupo de cupins o comportamento foi n o responde. Na placa de Petri as formigas responderam ao contato com os cupins com comportamento de contato e abandono, morder e luta com o cupim, mas n o houve diferen a estatística entre os comportamentos. No experimento B observou-se luta entre as formigas de ninhos diferentes. Os experimentos mostraram que as formigas que co-habitam cupinzeiros n o tiveram nenhuma resposta agressiva ou de preda o com rela o aos cupins dos quais co-habitam, mas também n o tiveram comportamento de prote o com os mesmos, sugerindo que esta intera o entre formigas e cupins é de inquilinismo.Behavior of Ants (Hymenoptera: Formicidae) Co-inhabit of Termites (Isoptera: Termitidae) in grassland.Abstract. The aim of this study was to verify the kind of interactions between ants and termites that habit the same nest. Two kinds of experiments were done: A- to test the relation of predation, we used three ants and one termite, three ants and three termites and three ants and twelve termites; B- to test the relation of protection, we used three ants and three termites of the same nest and three ants of another nest. To verify predation, tests from distinct origins of ants and termites were done. The tests were composed by a hunting arena and glass Petri dishes. The observed behaviors were: no response; avoidance; ant grab the termite; and fight. The species studied were ants Camponotus sp. with termites Cornitermes silvestrii Emerson. In test A, the avoidance and abandoning behavior of the ants in the hunting arena regarding termite was significantly different for ants of different termite nests, and in anoth
Measuring the Cosmic Ray Muon-Induced Fast Neutron Spectrum by (n,p) Isotope Production Reactions in Underground Detectors
Cristiano Galbiati,John. F. Beacom
Physics , 2005, DOI: 10.1103/PhysRevC.73.049906
Abstract: While cosmic ray muons themselves are relatively easy to veto in underground detectors, their interactions with nuclei create more insidious backgrounds via: (i) the decays of long-lived isotopes produced by muon-induced spallation reactions inside the detector, (ii) spallation reactions initiated by fast muon-induced neutrons entering from outside the detector, and (iii) nuclear recoils initiated by fast muon-induced neutrons entering from outside the detector. These backgrounds, which are difficult to veto or shield against, are very important for solar, reactor, dark matter, and other underground experiments, especially as increased sensitivity is pursued. We used fluka to calculate the production rates and spectra of all prominent secondaries produced by cosmic ray muons, in particular focusing on secondary neutrons, due to their importance. Since the neutron spectrum is steeply falling, the total neutron production rate is sensitive just to the relatively soft neutrons, and not to the fast-neutron component. We show that the neutron spectrum in the range between 10 and 100 MeV can instead be probed by the (n, p)-induced isotope production rates 12C(n, p)12B and 16O(n, p)16N in oil- and water-based detectors. The result for 12B is in good agreement with the recent KamLAND measurement. Besides testing the calculation of muon secondaries, these results are also of practical importance, since 12B (T1/2 = 20.2 ms, Q = 13.4 MeV) and 16N (T1/2 = 7.13 s, Q = 10.4 MeV) are among the dominant spallation backgrounds in these detectors.
First Large Scale Production of Low Radioactivity Argon From Underground Sources
H. O. Back,F. Calaprice,C. Condon,E. de Haas,R. Ford,C. Galbiati,A. Goretti,T. Hohman,An. Inanni,B. Loer,D. Montanari,A. Nelson,A. Pocar
Physics , 2012,
Abstract: We report on the first large-scale production of low radioactivity argon from underground gas wells. Low radioactivity argon is of general interest, in particular for the construction of large scale WIMP dark matter searches and detectors of reactor neutrinos for non-proliferation efforts. Atmospheric argon has an activity of about 1 Bq/kg from the decays of 39Ar; the concentration of 39Ar in the underground argon we are collecting is at least a factor of 100 lower than this value. The argon is collected from a stream of gas from a CO2 well in southwestern Colorado with a Vacuum Pressure Swing Adsorption (VPSA) plant. The gas from the well contains argon at a concentration of 400-600 ppm, and the VPSA plant produces an output stream with an argon concentration at the level of 30,000-50,000 ppm (3-5%) in a single pass. This gas is sent for further processing to Fermilab where it is purified by cryogenic distillation. The argon production rate is presently 0.5 kg/day.
Cognitive and Psychological Outcomes in Younger vs. Older Children with Subtentorial/Supratentorial Ependymoma after Radiation Therapy  [PDF]
Geraldina Poggi, Annarita Adduci, Lorenza Gandola, Susanna Galbiati, Alessandro Degrate, Elena Sironi, Sandra Strazzer, Maura Massimino
Journal of Behavioral and Brain Science (JBBS) , 2011, DOI: 10.4236/jbbs.2011.13012
Abstract: Purpose: to investigate cognitive and psychological problems in children treated for intracranial ependymoma, the evolution of these disorders over time and the role of age at radiotherapy and tumor site, in their onset and persistence. Methods and Materials: 23 patients received a complete evaluation; some of them underwent follow-ups. The clinical data collected included sex, age (at diagnosis, assessment and tumor treatment, thus dividing patients into two cohorts: younger or older than 5 years), site (supratentorial vs. subtentorial), the presence of hydrocephalus, neurological examination, tumor treatment. All the patients received an age-appropriate cognitive and psychological evaluation. Results: The mean cognitive level was within the norm, with lower scores on the Performance Intelligence Quotient (PIQ). The psychological assessment revealed Internalizing problems and impaired independence. Children older than 5 years had a lower Intelligence Quotient (IQ) than the younger children, both at the initial evaluation and at follow-ups. Initially, the supratentorial group appeared to be less impaired than the subtentorial group but then exhibited a progressive decline in the IQ. In the subtentorial group, the children with an IQ within the normal range remained stable at the follow-up, while the children with below-norm scores at the initial evaluation showed deterioration over time. Conclusions: Tumor site seems to affect the cognitive outcome to a greater extent than age at radiotherapy.
Interaction of Caveolin-1 with Ku70 Inhibits Bax-Mediated Apoptosis
Huafei Zou, Daniela Volonte, Ferruccio Galbiati
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0039379
Abstract: Caveolin-1, the structural protein component of caveolae, acts as a scaffolding protein that functionally regulates signaling molecules. We show that knockdown of caveolin-1 protein expression enhances chemotherapeutic drug-induced apoptosis and inhibits long-term survival of colon cancer cells. In vitro studies demonstrate that caveolin-1 is a novel Ku70-binding protein, as shown by the binding of the scaffolding domain of caveolin-1 (amino acids 82–101) to the caveolin-binding domain (CBD) of Ku70 (amino acids 471–478). Cell culture data show that caveolin-1 binds Ku70 after treatment with chemotherapeutic drugs. Mechanistically, we found that binding of caveolin-1 to Ku70 inhibits the chemotherapeutic drug-induced release of Bax from Ku70, activation of Bax, translocation of Bax to mitochondria and apoptosis. Potentiation of apoptosis by knockdown of caveolin-1 protein expression is greatly reduced in the absence of Bax expression. Finally, we found that overexpression of wild type Ku70, but not a mutant form of Ku70 that cannot bind to caveolin-1 (Ku70 Φ→A), limits the chemotherapeutic drug-induced Ku70/Bax dissociation and apoptosis. Thus, caveolin-1 acts as an anti-apoptotic protein in colon cancer cells by binding to Ku70 and inhibiting Bax-dependent cell death.
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