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Search Results: 1 - 10 of 36358 matches for " Luciana Z.;Blume "
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Fungos antagonistas a Sclerotinia sclerotiorum em pepineiro cultivado em estufa
Ethur, Luciana Z.;Blume, Elena;Muniz, Marlove;Silva, Antonio Carlos F. da;Stefanelo, Daniela R.;Rocha, Edileusa K. da;
Fitopatologia Brasileira , 2005, DOI: 10.1590/S0100-41582005000200004
Abstract: white mold caused by sclerotinia sclerotiorum may severely damage vegetables grown in greenhouses. to develop a biological control program for this pathogen proper antagonists are needed. this work aimed to select efficient fungi antagonists for controlling s. sclerotiorum on cucumber (cucumis sativus) grown in greenhouses, and to evaluate the effect of the antagonist on the growth of the vegetable. an isolate of s. sclerotiorum obtained from cucumber and 112 fungi isolates belonging to four genera were used: trichoderma, fusarium, penicillium, and aspergillus. for the in vitro experiment, the cellophane method was used and eight trichoderma virens isolates were selected that had inhibited the pathogen growth by 94 to 100%. greenhouse experiments used sterilized and non-sterilized substrate in plastic cups and non-sterilized substrate in plastic bags. the substrate was inoculated with s. sclerotiorum and the eight isolates of t. virens were used as antagonists. all eight isolates controlled damping-off of plants caused by s. sclerotiorum, but the effect on cucumber growth varied according to the isolate and the substrate treatment.
Sele??o de antagonistas fúngicos a Fusarium solani e Fusarium oxysporum em substrato comercial para mudas
Ethur, Luciana Zago;Blume, Elena;Muniz, Marlove Fátima Bri?o;Flores, Maria Georgina Veiga;
Ciência Rural , 2007, DOI: 10.1590/S0103-84782007000600047
Abstract: tests in vitro are usually used for the initial selection of biocontrol agents against soil fungi, lacking methodologies using soil and/or substrate. the objective of this research was to accomplish the mass selection of fungi isolates antagonistic to f. solani and f. oxysporum in commercial substrate for seedlings. two experiments were conducted, with the pathogens f. solani and f. oxysporum, and 98 possible antagonistic fungi of the genera penicillium claviforme, penicillium, aspergillus and cladosporium. the suspension of the pathogens was inoculated in the substrate, in plastic cups, and the suspension of the other fungi was added five days later. the number of colony-forming unit of f. solani and f. oxysporum/g of substrate was counted after nine days. of the 98 isolates used against f. solani, 43% did not differ from the control, and 57% reduced its development in the substrate, with the three best isolates belonging to the genus penicillium claviforme. the three isolates of penicillium claviforme selected for f. solani were also efficient against f. oxysporum.
Las cosas al parecer perdidas
Jaime Blume
Literatura y lingüística , 1997,
The Trapped Polarized Fermi Gas at Unitarity
D. Blume
Physics , 2008, DOI: 10.1103/PhysRevA.78.013635
Abstract: We consider population-imbalanced two-component Fermi gases under external harmonic confinement interacting through short-range two-body potentials with diverging s-wave scattering length. Using the fixed-node diffusion Monte Carlo method, the energies of the "normal state" are determined as functions of the population-imbalance and the number of particles. The energies of the trapped system follow, to a good approximation, a universal curve even for fairly small systems. A simple parameterization of the universal curve is presented and related to the equation of state of the bulk system.
Energy dependence of hadronic observables in central Pb+Pb reactions at the CERN SPS
C. Blume
Physics , 2004, DOI: 10.1556/APH.24.2005.1-4.5
Abstract: In the recent years the NA49 experiment has collected data on Pb+Pb collisions at beam energies between 20 to 158 AGeV with the objective to cover the critical region of energy densities where the expected phase transition to a deconfined phase might occur in the early stage of the reactions. In this contribution the energy dependence of various hadronic observables is presented. These include m_t- and rapidity- distributions, particle ratio fluctuations, as well as HBT radii.
Centrality and Energy Dependence of Proton, Light Fragment and Hyperon Production
C. Blume
Physics , 2007, DOI: 10.1088/0954-3899/34/8/S133
Abstract: Recent results of the NA49 collaboration are discussed. These include the energy dependence of stopping and the production of the light fragments t and 3He. New data on the system size dependence of hyperon production at 40A and 158AGeV are also presented.
Threshold behavior of bosonic two-dimensional few-body systems
D. Blume
Physics , 2005, DOI: 10.1103/PhysRevB.72.094510
Abstract: Bosonic two-dimensional self-bound clusters consisting of $N$ atoms interacting through additive van der Waals potentials become unbound at a critical mass m*(N); m*(N) has been predicted to be independent of the size of the system. Furthermore, it has been predicted that the ground state energy E(N) of the N-atom system varies exponentially as the atomic mass approaches m*. This paper reports accurate numerical many-body calculations that allow these predictions to be tested. We confirm the existence of a universal critical mass m*, and show that the near-threshold behavior can only be described properly if a previously neglected term is included. We comment on the universality of the energy ratio E(N+1)/E(N) near threshold.
Small mass- and trap-imbalanced two-component Fermi systems
D. Blume
Physics , 2008, DOI: 10.1103/PhysRevA.78.013613
Abstract: Motivated by the prospect of optical lattice experiments with two-component Fermi gases consisting of different atomic species such as Li and K, we calculate the energies for N fermions under harmonic confinement as a function of the mass- and trap-imbalance, i.e., as a function of the ratio between the masses and frequencies of species one and two, using microscopic approaches. Our energies for N=2 through 6 can be used to determine the energetically most favorable configuration for a given number of atoms per species of a deep lattice in which each lattice site is approximately harmonic and in which tunneling between neighboring sites can be neglected. Furthermore, our energies determine one of the input parameters, namely the onsite interaction strength, of the corresponding lattice Hamiltonian. We also determine and interpret the excitation gap for unequal-mass systems with up to N=13 atoms for equal oscillator lengths.
Fermionization of a bosonic gas under highly-elongated confinement: A diffusion quantum Monte Carlo study
D. Blume
Physics , 2002, DOI: 10.1103/PhysRevA.66.053613
Abstract: The diffusion quantum Monte Carlo technique is used to solve the many-body Schroedinger equation fully quantum mechanically and nonperturbatively for bosonic atomic gases in cigar-shaped confining potentials. By varying the aspect ratio of the confining potential from 1 (spherical trap) to 10000 (highly elongated trap), we characterize the transition from the three-dimensional regime to the (quasi-)one-dimensional regime. Our results confirm that the bosonic gas undergoes ``fermionization'' for large aspect ratios. Importantly, many-body correlations are included explicitly in our approach.
Is there Life after Hadronization? An Experimental Overview
Christoph Blume
Physics , 2011,
Abstract: Recents experimental findings on the properties of the chemical and kinetic freeze-out are reviewed, including data from low energies (SPS) over RHIC, up to recent results from the LHC. We discuss whether chemical freeze-out coincides with hadronization or if there is evidence for a "life after hadronization" which might significantly change particle abundances.
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