oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2019 ( 198 )

2018 ( 312 )

2017 ( 306 )

2016 ( 324 )

Custom range...

Search Results: 1 - 10 of 164260 matches for " Mario H. Perez "
All listed articles are free for downloading (OA Articles)
Page 1 /164260
Display every page Item
Cyanobacterial Toxins as Allelochemicals with Potential Applications as Algaecides, Herbicides and Insecticides
John P. Berry,Miroslav Gantar,Mario H. Perez,Gerald Berry
Marine Drugs , 2008,
Abstract: Cyanobacteria ( ¢ € blue-green algae ¢ € ) from marine and freshwater habitats are known to produce a diverse array of toxic or otherwise bioactive metabolites. However, the functional role of the vast majority of these compounds, particularly in terms of the physiology and ecology of the cyanobacteria that produce them, remains largely unknown. A limited number of studies have suggested that some of the compounds may have ecological roles as allelochemicals, specifically including compounds that may inhibit competing sympatric macrophytes, algae and microbes. These allelochemicals may also play a role in defense against potential predators and grazers, particularly aquatic invertebrates and their larvae. This review will discuss the existing evidence for the allelochemical roles of cyanobacterial toxins, as well as the potential for development and application of these compounds as algaecides, herbicides and insecticides, and specifically present relevant results from investigations into toxins of cyanobacteria from the Florida Everglades and associated waterways.
Cyanobacterial Toxins as Allelochemicals with Potential Applications as Algaecides, Herbicides and Insecticides
John P. Berry,Miroslav Gantar,Mario H. Perez,Gerald Berry,Fernando G. Noriega
Marine Drugs , 2008, DOI: 10.3390/md6020117
Abstract: Cyanobacteria (“blue-green algae”) from marine and freshwater habitats are known to produce a diverse array of toxic or otherwise bioactive metabolites. However, the functional role of the vast majority of these compounds, particularly in terms of the physiology and ecology of the cyanobacteria that produce them, remains largely unknown. A limited number of studies have suggested that some of the compounds may have ecological roles as allelochemicals, specifically including compounds that may inhibit competing sympatric macrophytes, algae and microbes. These allelochemicals may also play a role in defense against potential predators and grazers, particularly aquatic invertebrates and their larvae. This review will discuss the existing evidence for the allelochemical roles of cyanobacterial toxins, as well as the potential for development and application of these compounds as algaecides, herbicides and insecticides, and specifically present relevant results from investigations into toxins of cyanobacteria from the Florida Everglades and associated waterways.
Technico-Economical Evaluation of CO2 Transport in an Adsorbed Phase  [PDF]
Mildred Lemus Perez, Manuel Rodriguez Susa, Mario Pellerano, Arnaud Delebarre
Low Carbon Economy (LCE) , 2012, DOI: 10.4236/lce.2012.31004
Abstract: This work considers the possibility to transport CO2 in an adsorbed phase and analyzes its cost as a function of transported quantities, transport conditions and transportation means. CO2 adsorption capacities of 6 different adsorbents, comprising 4 activated carbons and 2 zeolites, were empirically evaluated in a given range of pressure and temperature. The adsorbent with the highest mass adsorption capacity (AC1), as well as another sorbent described in the literature (AC5) were selected to be used for CO2 transportation by ships, trains or trucks. Their characteristics and performances were then used to develop an economic analysis of transportation costs and CO2 emissions generated by the transport with or without storage. Economic evaluation of CO2 batch transport shows that CO2 transported in an adsorbed phase by train was seen to be almost competitive on distances between 250 and 500 km, in comparison to liquefied CO2. One of the activated carbon appeared to be competitive on short distances by truck when transport was not followed by storage. Ship transport of adsorbed CO2 on distances around 1500 km was competitive, when CO2 was used as delivered; there was an over cost of only 16%, when there was storage after the transport. The CO2 emissions generated by CO2 transport and storage when transport is carried out in an adsorbed phase were smaller than the ones generated by liquid phase transport below 1200 km, 500 km and 300 km by ship, train and truck respectively, as a function of the adsorbent used. Adsorbed CO2 transported on 1500 km by ship generated 27% less CO2 emissions than liquid phase and 17% by train for a distance of 250 km and 16% by truck on 150 km, although these differences were decreasing with the distance of transport.
Simulating FAS-induced apoptosis by using P systems
Smitha Cheruku,Andrei Paun,Francisco J Romero-Campero,Mario J Perez-Jimenez,Oscar H Ibarra,
Smitha Cheruku
,Andrei P?un,Francisco J. Romero-Campero,Mario J. Pérez-Jiménez and Oscar H. Ibarra

自然科学进展 , 2007,
Abstract: In contrast to differential equations, P systems are an unconventional model of computation which takes into consideration the discrete character of the quantity of components and the inherent randomness that exists in biological phenomena. The key feature of P systems is their compartmentalised structure which represents the heterogeneity of the structural organisation of the cells, and where one can take into account the role played by membranes in the functioning of the system, for example signalling at the cell surface, selective uptake of substances from the media, diffusion across different compartments, etc. We show here that P systems can be a reliable tool for Systems Biology and could even outperform in some cases the current simulation techniques based on differential equations. We will also use a strategy based on the well known Gillespie algorithm but running on more than one compartment called Multi-compartmental Gillespie Algorithm.
Consideraciones sobre problemáticas del adolescente a través de la patología
MARIO PEREZ,MARIO SEPULVEDA,CARLOS ALMONTE
Revista chilena de pediatría , 1973,
Abstract:
Modeling turbulent wave-front phase as a fractional Brownian motion: a new approach
Dario G. Perez,Luciano Zunino,Mario Garavaglia
Physics , 2004, DOI: 10.1364/JOSAA.21.001962
Abstract: This paper introduces a general and new formalism to model the turbulent wave-front phase using fractional Brownian motion processes. Moreover, it extends results to non-Kolmogorov turbulence. In particular, generalized expressions for the Strehl ratio and the angle-of-arrival variance are obtained. These are dependent on the dynamic state of the turbulence.
A fractional Brownian motion model for the turbulent refractive index in lightwave propagation
Dario G. Perez,Luciano Zunino,Mario Garavaglia
Physics , 2003, DOI: 10.1016/j.optcom.2004.08.007
Abstract: It is discussed the limitations of the widely used markovian approximation applied to model the turbulent refractive index in lightwave propagation. It is well-known the index is a passive scalar field. Thus, the actual knowledge about these quantities is used to propose an alternative stochastic process to the markovian approximation: the fractional Brownian motion. This generalizes the former introducing memory; that is, there is correlation along the propagation path.
On Bose-Einstein Condensation in any Dimension
H. Perez Rojas
Physics , 1996, DOI: 10.1016/S0375-9601(97)80679-2
Abstract: Arbitrarily large ground state population is a general property of any ideal bose gas when conditions of degeneracy are satisfied; it occurs at any dimension D. For $D = 1$, the condensation is diffuse, at $D = 2$ it is a sort of quasi-condensate. The discussion is made by following a microscopic approach and for finite systems. Some astrophysical consequences are discussed, as well as the temperature-dependent mass case.
Bose-Einstein condensation may occur in a constant magnetic field
H. Perez Rojas
Physics , 1995, DOI: 10.1016/0370-2693(96)00430-3
Abstract: Bose-Einstein condensation of charged scalar and vector particles may actually occur in presence of a constant homogeneous magnetic field, but there is no critical temperature at which condensation starts. The condensate is described by the statistical distribution. The Meissner effect is possible in the scalar, but not in the vector field case, which exhibits a ferromagnetic behavior.
Bose-Einstein Condensation in a Constant Magnetic Field
H. Perez,L. Villegas
Physics , 1999,
Abstract: We discuss the occurrence of Bose-Einstein condensation in systems of noninteracting charged particles in three in one dimensions and in presence of an external magnetic field. In the one dimensional, as well as in the magnetic field cases, although not a critical temperature, a characteristic temperature can be found, corresponding to the case in which the ground state density becomes a macroscopic fraction of the total density. The case of relativistic charged scalar and vector particles is studied. The results obtainedgive support to the existence of superconductivity in extremely strong magnetic fields, and leads to the prediction of superconductive-ferromagnetic behavior in the vector field case, which might be of interest in condensed matter as well as in cosmology. Some features of the magnetization in the early universe are conjectured.
Page 1 /164260
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.