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Search Results: 1 - 10 of 189685 matches for " G. Cerdenares "
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Composición y distribución de la ictiofauna en la Laguna del Mar Muerto, Pacifico mexicano
M. Tapia-García,C. Suárez Nú?ez,G. Cerdenares,L. de Guevara
Revista de Biología Tropical , 1998,
Abstract: La Laguna del Mar Muerto, Oaxaca-Chiapas fue muestreada entre 1991 y 1993 con el objetivo de caracterizar la ictiofauna en cuanto a su composición y abundancia. Se colectaron un total de 27 971 peces que aportaron 120.9 kg. La ictiofauna de la región está caracterizada por 29 familias, 45 géneros y 66 especies. El mayor número de especies se presenta en la parte sureste de la laguna (cerca de la Boca de Tonalá), área con mayor influencia marina, abundante vegetación costera y mayor descarga fluvial. El menor número de especies se presenta en la parte más interna de la laguna, caracterizada por hipersalinidad en la época de secas y baja salinidad en la época de lluvias. Las especies que presentan amplia distribución son Diapterus peruvianus, Lile stolifera, Anchoa lucida, Anchoa mundeola, Mugil curema, Atherinella guatemalensis y Anchovia macrolepidota. Fish composition was sampled in Mar Muerto Lagoon (Mexico) between 1991 and 1993. A total of 27 971 fish with a weight of 120.9 kg were collected. The total sample consists of 29 families, 45 genera and 66 species. The highest number of species is in the area with strong marine influence (near Tonala Inlet), abundant coastal vegetation and fluvial discharge. The lowest number of species is in the inner part of the lagoon, which is hipersaline in the dry season and of low salinity in the rainy season. The species with broad distribution are Diapterus peruvianus, Lile stolifera, Anchoa lucida, Anchoa mundeola, Mugil curema, Atherinella guatemalensis and Anchovia macrolepidota.
Reproduction, distribution and abundance of Bothus constellatus (Pisces: Bothidae), in the Gulf of Tehuantepec, Mexico
Tapia-García,M.; García-Abad,M. C.; Cerdenares Ladrón de Guevara,G.;
Revista de Biología Tropical , 2000,
Abstract: a total of 3 593 individuals of bothus constellatus was captured during five oceanographic cruises carried out in the gulf of tehuantepec, mexico. its distribution, abundance, and reproduction patterns were stated by means of the analysis of the population parameters (i.e. density, biomass, weight and size average, visceral and gonadosomatic index, and maturity stages). b. constellatus is a typical demersal marine species, because it does not occur in estuaries, but occurs near to them on the continental shelf. it is distributed in the gulf of tehuantepec in depths lesser than 60 m, with high abundance around the 40 m isobath, and in front of mar muerto lagoon. during january and may the biomass and density were high. the size at first maturity of females is 101 mm total length, and maturation occurs first in zones influenced by estuarine processes. reproduction and recruitment were detected in all the collections.
Reproduction, distribution and abundance of Bothus constellatus (Pisces: Bothidae), in the Gulf of Tehuantepec, Mexico
M. Tapia-García,M. C. García-Abad,G. Cerdenares Ladrón de Guevara
Revista de Biología Tropical , 2000,
Abstract: A total of 3 593 individuals of Bothus constellatus was captured during five oceanographic cruises carried out in the Gulf of Tehuantepec, Mexico. Its distribution, abundance, and reproduction patterns were stated by means of the analysis of the population parameters (i.e. density, biomass, weight and size average, visceral and gonadosomatic index, and maturity stages). B. constellatus is a typical demersal marine species, because it does not occur in estuaries, but occurs near to them on the continental shelf. It is distributed in the Gulf of Tehuantepec in depths lesser than 60 m, with high abundance around the 40 m isobath, and in front of Mar Muerto Lagoon. During January and May the biomass and density were high. The size at first maturity of females is 101 mm total length, and maturation occurs first in zones influenced by estuarine processes. Reproduction and recruitment were detected in all the collections.
Composición y distribución de la ictiofauna en la Laguna del Mar Muerto, Pacifico mexicano
Tapia-García,M.; Suárez Nú?ez,C.; Cerdenares,G.; de Guevara,L.; Macuitl Montes,M. C.; García Abad,M. C.;
Revista de Biología Tropical , 1998,
Abstract: fish composition was sampled in mar muerto lagoon (mexico) between 1991 and 1993. a total of 27 971 fish with a weight of 120.9 kg were collected. the total sample consists of 29 families, 45 genera and 66 species. the highest number of species is in the area with strong marine influence (near tonala inlet), abundant coastal vegetation and fluvial discharge. the lowest number of species is in the inner part of the lagoon, which is hipersaline in the dry season and of low salinity in the rainy season. the species with broad distribution are diapterus peruvianus, lile stolifera, anchoa lucida, anchoa mundeola, mugil curema, atherinella guatemalensis and anchovia macrolepidota.
A Characterization of the Members of a Subfamily of Power Series Distributions  [PDF]
G. Nanjundan
Applied Mathematics (AM) , 2011, DOI: 10.4236/am.2011.26099
Abstract: This paper discusses a characterization of the members of a subfamily of power series distributions when their probability generating functions satisfy the functional equation where a, b and c are constants and is the derivative of f.
Double Negative Left-Handed Metamaterials for Miniaturization of Rectangular Microstrip Antenna  [PDF]
G. Singh
Journal of Electromagnetic Analysis and Applications (JEMAA) , 2010, DOI: 10.4236/jemaa.2010.26044
Abstract: In this paper, I have explored a significant concept for the miniaturization of microstrip patch antenna configuration by using the double negative (DNG) left-handed Metamaterials, which have dielectric permittivity and magnetic permeability both negative, simultaneously. It is achieved through the concept of phase-compensation by thin slab consist of the double positive (DPS) material, which have dielectric permittivity and magnetic permeability both positive, simultaneously and DNG metamaterials as a substrate of the microstrip patch antenna. By combining the DNG metamaterial slab with the slab made of DPS materials form a cavity resonator whose dispersion relation is independent of the sum of thickness of the slabs filling this cavity but it depends on the ratio of their thicknesses. This cavity constitutes by DPS and DNG material is used as substrate of the microstrip antennas and the DNG material slab is behave as phase compensator.
Dynamic and Configurational Approach to the Glass Transition by Nanoscale Cooperativity  [PDF]
G. Romeo
Open Journal of Biophysics (OJBIPHY) , 2012, DOI: 10.4236/ojbiphy.2012.23012
Abstract: Here we examine the findings obtained for disaccharide/water mixtures near glass transition that involves cooperative relaxation features on kinetic by viscosity and on thermodynamic behaviour by neutron scattering. Then to address cooperative phenomena that mitigate the Debye-Waller behaviour we invoke Adam-Gibbs’ idea of a cooperative rearranging region. Neutron results suggest that the excess mean square displacement behaves as free volume and is closely connected to an elementary step of the structural relaxation. Then viscosity data evidence a breakdown of the Einstein-Debye relation, decoupling attributed to the intermolecular cooperativity.
Confidence Level Estimator of Cosmological Parameters  [PDF]
G. Sironi
Journal of Modern Physics (JMP) , 2012, DOI: 10.4236/jmp.2012.329157
Abstract: Cosmological Models frequently suggest the existence of physical, quantities, e.g. dark energy, we cannot yet observe and measure directly. Their values are obtained indirectly setting them equal to values and accuracy of the associated model parameters which best fit model and observation. Apparently results are so accurate that some researchers speak of precision cosmology. The accuracy attributed to these indirect values of the physical quantities however does not include the uncertainty of the model used to get them. We suggest a Confidence Level Estimator to be attached to these indirect measurements and apply it to current cosmological models.
Mitochondrial DNA sequence analysis in Anabantoidei fish  [PDF]
G. Degani
Advances in Biological Chemistry (ABC) , 2013, DOI: 10.4236/abc.2013.33039
Abstract:

The decline of ornamental fish populations in their native habitats due to over-fishing has brought about the development of ornamental fish aquaculture, to which fish of the Anabantoidei suborder are important contributors. The genetic variations among species of this suborder were examined by mitochondrial gene sequencing analysis using the cytochrome b and 12S genes. According to the cytochrome b gene, the most similar strains were Trichogaster trichopterus (gold) and Trichogaster trichopterus (blue) (100%). Trichogaster leerii was less similar to them (86.0%), and an even lower similarity was found between the species T. trichopterus and Trichogaster labiosus (85.6%). The least similarity was observed between Betta betta and the genera Colisa (50.2%) and Trichogaster (60.1%). The phylogenetic trees of 12S and cytochrome b were very similar. According to 12S, the similarity between Trichogaster species was high (91.4% - 100%), and between species of this genus and Colisa lalia, it was lower (88.4%). In conclusion, sequence analyses, based on cytochrome

Estimation of Parameter in a New Truncated Distribution  [PDF]
G. Nanjundan
Open Journal of Statistics (OJS) , 2013, DOI: 10.4236/ojs.2013.34025
Abstract: This paper discusses the estimation of the parameter in a truncated form of a discrete distribution which is analogous to Burr distribution. The maximum likelihood and the moment estimators of the parameter are obtained. Their asymptotic properties are also established.
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