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Search Results: 1 - 10 of 29302 matches for " Bernardo González "
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Speeds and stance of titanosaur sauropods: analysis of Titanopodus tracks from the Late Cretaceous of Mendoza, Argentina
González Riga, Bernardo J.;
Anais da Academia Brasileira de Ciências , 2011, DOI: 10.1590/S0001-37652011005000002
Abstract: speed estimations from trackways of titanopodus mendozensis gonzález riga and calvo provide information about the locomotion of titanosaurian sauropods that lived in south america during the late cretaceous. titanopodus ichnites were found at agua del choique, a newly discovered track site in the loncoche formation, late campanian-early maastrichtian of mendoza, argentina. this speed study follows the hypothesis of dynamic similarity proposed by alexander. as a refinement of this method, a complementary equation is presented here based on an articulated titanosaurian specimen collected in strata that are regarded as correlative to those that have yielded titanopodus tracks (allen formation, neuquén basin). this analysis indicates that hip height can be estimated as 4.586 times the length of the pes track in derived titanosaurs. with an estimation of the hip height and the stride measurements, the speed is calculated. the study of two wide-gauge trackways indicates that titanopodus ichnites were produced by mediumsized titanosaurs (hip height of 211-229 cm) that walked at 4.7-4.9 km/h towards the south and southwest, following, in part, a sinuous pathway. these speeds and some taphonomic features of tracks (prominent rims, distorted elongated shapes)indicate the capacity of derived titanosaurs for walking effectively over a very wet and slippery substrate. in the ichnological record, the walking speeds of titanopodustrackmakers are somewhat faster than those previously inferred for most sauropods.
Nuevos restos fósiles de Mendozasaurus neguyelap (Sauropoda, Titanosauria) del Cretácico Tardío de Mendoza, Argentina
González Riga,Bernardo J.;
Ameghiniana , 2005,
Abstract: in south america, most titanosaur species are represented by incomplete skeletal elements lacking well-preserved cervical vertebrae. in this context, the discovery of cervical remains assigned to mendozasaurus neguyelap gonzález riga is relevant from a systematic viewpoint. the fossils were found in the paleontological site and assemblage of the holotype, río neuquén subgroup, late turonian - late coniacian from mendoza province, argentina. the cervical vertebrae of mendozasaurus exhibit differences with those of most titanosaurs; however, they share with isisaurus colberti (jain and bandyopadhyay) from maastrichthian of india the presence of: a) short vertebral centra (ratio: total length/height of cotyle less than 2.5), b) large and deep supradiapophyseal fossa, and c) relatively tall neural spines (ratio: vertebral height / centrum length more than 1.5). the fossils recovered show an autapomorphic character that enlarges the diagnosis of mendozasaurus : tall, laminar and transversally expanded mid-posterior cervical neural spines that are wider than vertebral centra and ‘fan-like' or ‘subrhomboid' in shape due to lateral expansions and a subrounded dorsal border. the fossil record of titanosaurs shows a notable morphologic diversity in the cervical series. in particular, mendozasaurus neguyelap and isisaurus colberti possess tall neural spines associated with the proportionally shortest cervical centra of any titanosaur. this unusual morphology suggests the development of relatively wide, robust and short necks in late cretaceous sauropods from argentina and india.
Prolegómenos para una fenomenología del llanto
García González, Bernardo;
Desacatos , 2009,
Abstract: this paper questions the act of crying and analyzes three suppositions commonly used in previous research: that crying is merely the shedding of tears; that it is the opposite action of laughter; and that its comprehension is inscribed and limited to the human expression sphere. at the same time, it develops some arguments in order to postulate the need for approaching crying from a phenomenological perspective that accounts for the immediate experience of the event, without using theories that lessen the phenomenon’s richness.
Vertebrados cretácicos de la Formación Loncoche en Calmu-Co, Mendoza, Argentina
Previtera,Elena; González Riga,Bernardo J.;
Ameghiniana , 2008,
Abstract: we describe new fossil vertebrates from the loncoche formation in the calmu-co area of mendoza province, argentina. at this site the lower section of the formation corresponds to lacustrine and meandering fluvial environments (facies associations a and b, respectively), whereas the middle levels of the formation are assigned to marginal marine deposits (facies association c). the vertebrates were found in facies association c and include fishes (i.e., chondrichthyes, teleostei, lepisosteidae and dipnoi), chelidae turtles (cf. yaminuechelys, cf. prochelidella), dinosaurs (titanosauria) and plesiosaurs (elasmosauridae). the remains, found in clastic and calcareous facies (mudstones and grainstones), are interpreted to reflect channel and deltaic plain environments. the diverse ecology (terrestrial, fresh water, marine) and the fragmentary character of these skeletal concentrations suggest mixing of fossil remains from littoral environments and fluvial systems. our findings indicate that the atlantic marine ingression that covered northern patagonia reached calmu-co, in the western part of the neuquén basin. vertebrates from calmu-co area are assigned to the late campanian-early maastrichtian on the basis of similarities with vertebrates assemblages found in other sites within mendoza (ranquil-có) and northern patagonia (río negro and chubut provinces, allen, la colonia and los alamitos formations).
A complete 3-dimensional Blaschke-Santaló diagram
René Brandenberg,Bernardo González Merino
Mathematics , 2014,
Abstract: We present a complete 3-dimensional Blaschke-Santal\'o diagram for planar convex bodies with respect to the four classical magnitudes inner and outer radius, diameter and (minimal) width in euclidean spaces.
A remark on perimeter-diameter and perimeter-circumradius inequalities under lattice constraints
Bernardo González Merino,Matthias Henze
Mathematics , 2013,
Abstract: In this note, we study several inequalities involving geometric functionals for lattice point-free planar convex sets. We focus on the previously not addressed cases perimeter--diameter and perimeter--circumradius.
A generalization of the discrete version of Minkowski's fundamental theorem
Bernardo González Merino,Matthias Henze
Mathematics , 2014,
Abstract: One of the most fruitful results from Minkowski's geometric viewpoint on number theory is his so called 1st Fundamental Theorem. It provides an optimal upper bound for the volume of an o-symmetric convex body whose only interior lattice point is the origin. Minkowski also obtained a discrete analog by proving optimal upper bounds on the number of lattice points in the boundary of such convex bodies. Whereas the volume inequality has been generalized to any number of interior lattice points already by van der Corput in the 1930s, a corresponding result for the discrete case remained to be proven. Our main contribution is a corresponding optimal relation between the number of boundary and interior lattice points of an o-symmetric convex body. The proof relies on a congruence argument and a difference set estimate from additive combinatorics.
The asymmetry of complete and constant width bodies in general normed spaces and the Jung constant
René Brandenberg,Bernardo González Merino
Mathematics , 2014,
Abstract: In this paper we state a one-to-one connection between the maximal ratio of the circumradius and the diameter of a body (the Jung constant) in an arbitrary Minkowski space and the maximal Minkowski asymmetry of the complete bodies within that space. This allows to generalize and unify recent results on complete bodies and to derive a necessary condition on the unit ball of the space, assuming a given body to be complete. Finally, we state several corollaries, i.e. concerning the Helly dimension or the Banach-Mazur distance.
Methamphetamine and male suicide in the US-Mexico border region  [PDF]
Elsa de J. Hernández Fuentes, Bernardo Ng, Irma A. González Hernández
Open Journal of Internal Medicine (OJIM) , 2013, DOI: 10.4236/ojim.2013.32007

Introduction: Studying the use of psychoactive substances in completed suicide is essential in order to understand its role in the suicide generating stimuli. The most commonly reported substances are alcohol and opioids. Method: This is a retrospective study of completed suicide database of the Forensics Medical office in the city of Mexicali from 1999 to 2005. This is the capital of the Mexican state of Baja California in the US-Mexico border region. Results: Out of 288 suicides, 260 were men, and the most frequent drug found on autopsy was methamphetamine (p < 0.001). The modal victim was a young male (20 - 39 years old), employed in blue-collar jobs, lived in an urban area, found in their homes, and died by hanging. Discussion: Although no causal effect can be drawn, our study results suggest that methamphetamine use may be a risk factor for suicide in this sample.

Selection of Lactic Acid Bacteria Isolated from San Simón da Costa Cheese (PDO) in Order to Develop an Autochthonous Starter Culture  [PDF]
Leticia González, Araceli Fernández Cuadrillero, José María Castro, Ana Bernardo, María Eugenia Tornadijo
Advances in Microbiology (AiM) , 2015, DOI: 10.4236/aim.2015.511079
Abstract: Traditional cheeses are an important reservoir of microbial diversity that can have important biotechnological applications, especially with a view to improving the characteristics unique to each type of cheese, and in this respect, starter cultures consisting of autochthonous lactic acid bacteria strains are of particular interest. In the present study, we investigated lactic acid bacteria population diversity in San Simón da Costa cheese (PDO, Galicia, Spain) and found a predominance of the genus Lactobacillus, which by the end of ripening accounted for 78% of the strains isolated in Rogosa agar, around 40% of those in M17 agar and about 10% of those in MSE agar. The main species of lactic acid bacteria identified were Lactococcus lactis subsp. lactis, Lactobacillus casei subsp. casei, Lb. paracasei subsp. paracasei, Leuconostoc mesenteroides and Enterococcus faecalis. Virtually all the strains studied from a technological point of view yielded more than or equal to 0.24 g 100 mL-1 lactic acid. Lactococcus lactis
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