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Search Results: 1 - 10 of 9372 matches for " Alejandro;Mayorga-Saucedo "
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Solanaceae composition, pollination and seed dispersal syndromes in Mexican mountain cloud forest
Albuquerque, Lidiamar Barbosa;Velázquez, Alejandro;Mayorga-Saucedo, Rafel;
Acta Botanica Brasilica , 2006, DOI: 10.1590/S0102-33062006000300010
Abstract: in this work we hypothesised that solanaceae species composition and pollination and seed dispersal syndromes change according to the degree of disturbance. hence, the aim of this study is to analyze how the species composition of solanaceae changes along disturbance gradients of mountain cloud forest, and to establish how solanaceae pollination and seed dispersal syndromes vary along the same gradients. the study concentrates on the mountain cloud forests in hidalgo, mexico. solanaceae species collection was carried out along transects, laid out alongside paths and secondary roads. pollination and seed dispersal syndromes for all species were recorded based on floral and fruit morphological traits. from the 500 sample units surveyed, 392 contained 25 solanaceae species. the (dis)similarity among sample units highlighted a major division: the first group harboured species more commonly found in less disturbed and more humid conditions, whereas the second group contained species more commonly found in contrasting conditions. melittophily pollination syndromes turned out to be equally relevant in the environmental conditions of both groups. with regard to seed dispersal syndromes, ornithochory (45.8%) prevailed over chiropterochory (37.5%) in group i less disturbed and more humid areas, whereas chiropterochory (50%) prevailed within group ii.
Habitar la calle: pasos hacia una ciudadanía a partir de este espacio
Saucedo,Iván Alejandro; Taracena,Bertha Elvia;
Revista Latinoamericana de Ciencias Sociales, Ni?ez y Juventud , 2011,
Abstract: this article explores the notion of rooting linked to the fact of using the street as a main residence space, addressing the implications of the use of this term as a category of analysis and intervention on the basis of their dynamic nature and the particular use made of the street space from this condition. on a field work generated under an ethnographic approach, this work explores how it inhabits the street and it becomes a rooting to this space by a group of young people residing there. processes apart from reducing the damage derived from certain common practices in the street, favoring the autonomy and the possibility of citizen participation are proposed.
Habitar la calle: pasos hacia una ciudadanía a partir de este espacio
Iván Alejandro Saucedo,Bertha Elvia Taracena
Revista Latinoamericana de Ciencias Sociales, Ni?ez y Juventud , 2011,
Abstract: En este artículo exploramos la noción de arraigo vinculada al hecho de emplear la calle como principal espacio de residencia, abordando las implicaciones del uso de este término como categoría de análisis e intervención, partiendo de su carácter dinámico y del uso particular que se hace de los espacios callejeros desde esta condición. A través de un trabajo de campo generado bajo un enfoque etnográfico, exploramos cómo es que se habita la calle y se constituye un arraigo a este espacio por parte de un grupo de jóvenes que ahí residen.Proponemos procesos que además de reducir el da o derivado de ciertas prácticas comunes en la calle, favorezcan la autonomía y la posibilidad de participación ciudadana.
An Ethical Approach to the Concept of Toleration: Understanding Tolerance as a Political Virtue  [PDF]
Ivón Cepeda Mayorga
Open Journal of Philosophy (OJPP) , 2014, DOI: 10.4236/ojpp.2014.44059
Abstract: The concept of toleration is commonly argued in political discourses and debates, when people refer to diversity and pluralism, as a form of respect and understanding. However, this does not represent an improvement at the moment of dealing with issues where a variety of values, conceptions and beliefs arises. In addition, even though when the idea of toleration was developed during Enlightenment, nowadays it seems to lead to a misconception of the term, following a connotation of a passive indifference about diversity. Due to this, the main objective of this text is to analyze the concept of toleration from an ethical perspective that allows thinking about it in terms of a political virtue needed to face the challenges of diversity inside society. In order to show this, the text presents an analysis of different conceptions of the term, in order to highlight the positive notion of toleration; after that, the text moves on, reviewing the idea of toleration from a hermeneutical perspective, as a form to reinforce the positive characteristics of the term, and path to solve the query between tolerance and intolerance. Finally, as a conclusion, it underlines that understanding the concept of toleration from an ethical perspective implies a praxis develop in daily circumstances.
Neuromuscular Activity of Micrurus laticollaris (Squamata: Elapidae) Venom in Vitro
Alejandro Carbajal-Saucedo,Rafael Stuani Floriano,Cháriston André Dal Belo,Alejandro Olvera-Rodríguez,Alejandro Alagón,Léa Rodrigues-Simioni
Toxins , 2014, DOI: 10.3390/toxins6010359
Abstract: In this work, we have examined the neuromuscular activity of Micrurus laticollaris (Mexican coral snake) venom (MLV) in vertebrate isolated nerve-muscle preparations. In chick biventer cervicis preparations, the MLV induced an irreversible concentration- and time-dependent (1–30 μg/mL) neuromuscular blockade, with 50% blockade occurring between 8 and 30 min. Muscle contractures evoked by exogenous acetylcholine were completely abolished by MLV, whereas those of KCl were also significantly altered (86% ± 11%, 53% ± 11%, 89% ± 5% and 89% ± 7% for one, three, 10 and 30 μg of venom/mL, respectively; n = 4; p < 0.05). In mouse phrenic nerve-diaphragm preparations, MLV (1–10 μg/mL) promoted a slight increase in the amplitude of twitch-tension (3 μg/mL), followed by neuromuscular blockade ( n = 4); the highest concentration caused complete inhibition of the twitches (time for 50% blockade = 26 ± 3 min), without exhibiting a previous neuromuscular facilitation. The venom (3 μg/mL) induced a biphasic modulation in the frequency of miniature end-plate potentials (MEPPs)/min, causing a significant increase after 15 min, followed by a decrease after 60 min (from 17 ± 1.4 (basal) to 28 ± 2.5 ( t 15) and 12 ± 2 ( t 60)). The membrane resting potential of mouse diaphragm preparations pre-exposed or not to d-tubocurarine (5 μg/mL) was also significantly less negative with MLV (10 μg/mL). Together, these results indicate that M. laticollaris venom induces neuromuscular blockade by a combination of pre- and post-synaptic activities.
Hydraulic Reliability Assessment and Optimal Rehabilitation/Upgrading Schedule for Water Distribution Systems  [PDF]
Wei Peng, Rene V. Mayorga
Applied Mathematics (AM) , 2016, DOI: 10.4236/am.2016.718184
Abstract: This paper develops an innovative approach to optimize a long-term rehabilitation and upgrading schedule (RUS) for a water distribution system with considering both hydraulic failure and mechanical performance failure circumstances. The proposed approach assesses hydraulic reliability dynamically and then optimizes the long-term RUS in sequence for a water distribution system. The uncertain hydraulic parameters are treated as random numbers in a stochastic hydraulic reliability assessment. The methodologies used for optimization in a stochastic environment are: Monte Carlo Simulation, EPANET Simulation, Genetic Algorithms, Shamir and Howard’s Exponential Model, Threshold Break Rate Model and Two-Stage Optimization Model. The proposed approach is conducted on a simulation model of water distribution network in a computer by two universal codes, namely the hydraulic reliability code and the optimal RUS code. The applicability of this approach is verified in an example of a benchmark water distribution network.
b-n-acetylglucosaminidase production by Lecanicillium (Verticillium) lecanii ATCC 26854 by solid-state fermentation utilizing shrimp shell
Barranco Florido,Esteban; Bustamante Camilo,Patricia; Mayorga-Reyes,Lino; González Cervantes,Rina; Martínez Cruz,Patricia; Azaola,Alejandro;
Interciencia , 2009,
Abstract: lecanicillium (verticillium) lecanii produced chitinases using shrimp shell as inducer. maximum production of b-n-acetylglucosaminidase was measured at 80h. enzyme stability was obtained at temperatures ranging from 30 to 40°c and maximum activity at 50°c, ph 6.0. enzyme activity increased with ba2+, co2+, fe3+ and zn2+. bioassays against the phytopathogenic fungus oidium spp. showed mycelial and germination inhibition. sds-page electrophoresis of the partially purified extract revealed four bands of 70, 58, 45 and 31kda and this extract showed activity of b-n-acetylglucosaminidase through zymogram analysis. chitinases produced by l. lecanii are potentially useful against phytopathogenic fungi, insects and chitosan bioconversions.
Cruzando fronteiras: prostitui??o e imigra??o
Mayorga, Claudia;
Cadernos Pagu , 2011, DOI: 10.1590/S0104-83332011000200014
Abstract: this work presents a reflection about the identity tensions experienced by brazilian women who migrated to spain to practice prostitution from a critical perspective on eurocentric and colonial logics. such prospects, since the emergence of national states, have brought the invention of other, naturalizing unequal relations of race, ethnicity, gender, nationality. we will see how brazilian immigrants and prostitutes live heterodesignations as the other focusing on possible questions to social hierarchies from their status as immigrants and prostitutes in europe. for this, we will review the crisis that the european national states have experienced and which as a consequence has been worsening xenophobic and racist practices. we also present the analysis of interviews conducted with brazilian immigrant prostitutes in madrid, spain.
Neopopulismo y democracia en Bolivia
Mayorga,Fernando;
Revista de ciencia política (Santiago) , 2003, DOI: 10.4067/S0718-090X2003000100007
Abstract: este trabajo aborda el impacto político del neopopulismo en la democracia boliviana, así como los rasgos de la dinámica organizativa y del accionar de sus dos expresiones partidistas -ucs y condepa- que se constituyeron en fuerzas relevantes entre 1989 y 1999. en ese período, estos partidos rivales cautivaron alrededor de un tercio del electorado -en comicios presidenciales y municipales-, participaron en pactos gubernamentales y ejercieron la administración municipal en las principales ciudades. su desempe?o se caracterizó por el predominio de reglas informales en su dinámica interna, la articulación de elementos culturales y simbólicos, la interpelación de nuevos actores sociales y la vinculación carismática entre líderes y adherentes. a través de ucs y condepa, el neopopulismo incidió en la consolidación del sistema de partidos mediante la ampliación de las bases sociales de la democracia representativa, así como en el despliegue de la reforma estatal a través de la inclusión de nuevas identidades y demandas en la discursividad política
Neopopulismo y democracia en Bolivia
Fernando Mayorga
Revista de Ciencia Política , 2003,
Abstract: Este trabajo aborda el impacto político del neopopulismo en la democracia boliviana, así como los rasgos de la dinámica organizativa y del accionar de sus dos expresiones partidistas -UCS y Condepa- que se constituyeron en fuerzas relevantes entre 1989 y 1999. En ese período, estos partidos rivales cautivaron alrededor de un tercio del electorado -en comicios presidenciales y municipales-, participaron en pactos gubernamentales y ejercieron la administración municipal en las principales ciudades. Su desempe o se caracterizó por el predominio de reglas informales en su dinámica interna, la articulación de elementos culturales y simbólicos, la interpelación de nuevos actores sociales y la vinculación carismática entre líderes y adherentes. A través de UCS y Condepa, el neopopulismo incidió en la consolidación del sistema de partidos mediante la ampliación de las bases sociales de la democracia representativa, así como en el despliegue de la reforma estatal a través de la inclusión de nuevas identidades y demandas en la discursividad política
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