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"Facultad de Ciencias - UNAM"

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Aproximadamente 121 registro(s) hasta el momento: (knowledge)

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101.

Abundance and species richness of Coreoidea (Hemiptera: Heteroptera) from Parque Estadual do Turvo, southern Brazil.
Barcellos, A. - Schmidt, L. S. - Brailovsky, H.

Formato:	Artículo, Trabajo de investigación original
Enlaces:	The coreoid fauna from Neotropics is poorly known, especially in terms of community studies. Aiming at contributing to this knowledge, a two-year study was carried out at Parque Estadual do Turvo, Municipality of Derrubadas, state of Rio Grande do Sul,…
Fecha:	2013-11-22
Recurso:	Facultad de Ciencias - UNAM

Recurso libre

102.

Flow of linear molecules through a 4:1:4 contraction-expansion using non-equilibrium molecular dynamics: Extensional rheology and pressure drop
Castillo-Tejas, J - Rojas-Morales, A - Alvarado, JFJ - Luna-Barcenas, G - Bautista, F - Manero, O - López-Medina, F

Formato:	Article
Enlaces:	In this work, non-equilibrium molecular dynamics simulations are used to generate the flow of linear polymer chains (monomer-springs with FENE potential) and a Lennard-Jones fluid (Newtonian fluid) through a con traction-expansion (4:1:4) geometry. An external force field simulating a constant…
Fecha:	2011-01-21
Recurso:	Facultad de Ciencias - UNAM

Recurso libre

103.

Vegetation heterogeneity and life-strategy diversity in the flora of the heterogeneous landscape of Nizanda, Oaxaca, Mexico
Pérez-García, Eduardo Alberto - Meave del Castillo, Jorge Arturo - Villaseñor, JL - Gallardo-Cruz, JA - Lebrija-Trejos, EE

Formato:	Article
Enlaces:	We updated the floristic checklist of the Nizanda region, Isthmus of Tehuantepec (southern Mexico), characterized the occurring plant communities based on dominant species, and described the region's flora according to life form, growth form, growth type, and growth habit spectra.…
Fecha:	2011-01-21
Recurso:	Facultad de Ciencias - UNAM

Recurso libre

104.

Exploring the factors that influence the perception of risk: The case of Volcan de Colima, Mexico
Gavilanes-Ruiz, JC - Cuevas-Muniz, A - Varley, N - Gwynne, G - Stevenson, J - Saucedo-Giron, R - Perez-Perez, A - Aboukhalil, M - Cortes-Cortes, A

Formato:	Article
Enlaces:	Volcan de Colima has increased its activity considerably since 1998 with four periods of effusion and since 2003, daily Vulcanian explosions. During 2005 the magnitude of the explosivity increased, producing many pyroclastic flows, two of which reached over 5 km…
Fecha:	2011-01-22
Recurso:	Facultad de Ciencias - UNAM

Recurso libre

105.

Impact of Transcription Units rearrangement on the evolution of the regulatory network of gamma-proteobacteria
Perez, ADG - Angarica, VE - Vasconcelos, ATR - Collado-Vides, J - González, EG

Formato:	Article
Enlaces:	Background: In the past years, several studies begun to unravel the structure, dynamical properties, and evolution of transcriptional regulatory networks. However, even those comparative studies that focus on a group of closely related organisms are limited by the rather scarce…
Fecha:	2011-01-22
Recurso:	Facultad de Ciencias - UNAM

Recurso libre

106.

Evaluation of self-absorption of manganese emission lines in Laser Induced Breakdown Spectroscopy measurements
Bredice, F - Borges, FO - Sobral, H - Villagran-Muniz, M - Di Rocco, HO - Cristoforetti, G - Legnaioli, S - Palleschi, V - Pardini, L - Salvetti, A - Tognoni, E

Formato:	Article
Enlaces:	This paper is part of a more general study aimed to the determination of the best experimental procedures for reliable quantitative measurements of Fe-Mn alloys by LIBS. In this work, attention is pointed on the self-absorption processes, whose effect deeply…
Fecha:	2011-01-22
Recurso:	Facultad de Ciencias - UNAM

Recurso libre

107.

Pathogenesis II: Fungal responses to host responses: interaction of host cells with fungi
Mendes-Giannini, MJS - Taylor, ML - Bouchara, JB - Burger, E - Calich, VLG - Escalante, ED - Hanna, SA - Lenzi, HL - Machado, MP - Miyaji, M - Da Silva, JLM - Mota, EM - Restrepo, A - Restrepo, S - Tronchin, G - Vincenzi, LR - Xidieh, CF - Zenteno, E

Formato:	Article
Enlaces:	Most of our knowledge concerning the virulence determinants of pathogenic fungi comes from the infected host, mainly from animal models and more recently from in vitro studies with cell cultures. The fungi usually present intra- and/or extracellular host-parasite interfaces, with…
Fecha:	2011-01-22
Recurso:	Facultad de Ciencias - UNAM

Recurso libre

108.

Coronal observations of CMEs
Schwenn, R - Raymond, JC - Alexander, D - Ciaravella, A - Gopalswamy, N - Howard, R - Hudson, H - Kaufmann, P - Klassen, A - Maia, D - Pick, M - Reiner, M - Srivastava, N - Tripathi, D - Vourlidas, A - Wang, YM - Zhang, J - Muñoz-Martínez, G

Formato:	Article
Enlaces:	CMEs have been observed for over 30 years with a wide variety of instruments. It is now possible to derive detailed and quantitative information on CME morphology, velocity, acceleration and mass. Flares associated with CMEs are observed in X-rays, and…
Fecha:	2011-01-22
Recurso:	Facultad de Ciencias - UNAM

Recurso libre

109.

ultrastructure of tarsal sensilla and other integument structures of two pseudocellus species (ricinulei, arachnida)
Talarico, G - Silva, MF - Alberti, G - Palacios-Vargas, JG

Formato:	Article
Enlaces:	Ricinuleids are one of the least investigated groups of Arachnida. In particular, knowledge of their ultrastructure is poor. Observations of the distal tarsomeres of ricinuleids show differences in their shape and equipment of surface structures. Legs I and II are…
Fecha:	2011-01-22
Recurso:	Facultad de Ciencias - UNAM

Recurso libre

110.

Population dynamics of Mammillaria magnimamma Harworth. (Cactaceae) in a lava-field in central Mexico
Valverde-Valdés, María Teresa - Quijas, S - López-Villavicencio, M - Castillo-Argüero, Silvia

Formato:	Article
Enlaces:	One of the habitats occupied by Mammillaria magnimamma is a 2000-year old lava-field, in Mexico City. The great ecological interest on this lava-field and the little knowledge there is regarding cacti population ecology have compelled us to analyse the demography…
Fecha:	2011-01-22
Recurso:	Facultad de Ciencias - UNAM

Recurso libre

111.

On the firing maps of a general class of forced integrate and fire neurons
Carrillo, H - Ongay, FA

Formato:	Article
Enlaces:	Integrate and fire processes are fundamental mechanisms causing excitable and oscillatory behavior. Van der Pol [Philos. Mag. (7) 2 (11) (1926) 978] studied oscillations caused by these processes, which he called,relaxation oscillations' and pointed out their relevance, not only to…
Fecha:	2011-01-22
Recurso:	Facultad de Ciencias - UNAM

Recurso libre

112.

LATEST OCCURRENCE OF THE EXTINCT GENUS CEDRELOSPERMUM (ULMACEAE) IN NORTH-AMERICA - CEDRELOSPERMUM-MANCHESTERI FROM MEXICO
MAGALLONPUEBLA, S - CEVALLOSFERRIZ, SRS

Formato:	Article
Enlaces:	The Upper Cenozoic flora of the Pie de Vaca Formation, Puebla, Mexico, is yielding important elements that contribute to a more complete knowledge of the Tertiary floras of southern latitudes of North America. Among the most abundant plant organs in…
Fecha:	2011-01-22
Recurso:	Facultad de Ciencias - UNAM

Recurso libre

113.

Ciberinfraestructura para Literatura Especializada en Ciencias Biomédicas
Calderón Rojas, R

Formato:	Seminario de Titulación
Enlaces:	El presente Seminario de Titulación es básicamente un trabajo de investigación y análisis sobre la Ciberinfraestructura disponible en la Web para el manejo y recuperación de literatura especializada en Ciencias Biomédicas, el cual incluye la descripción y una clasificación con…
Fecha:	2012-08-22
Recurso:	Facultad de Ciencias - UNAM

Recurso libre

114.

Hidrología y fauna acuática de los cenotes de la península de Yucatán.
Suárez-Morales, E. - Rivera-Arriaga, E.

Formato:	Artículo
Enlaces:	The hydrological characteristics of the Peninsula of Yucatan have given cause for the systems training limnological very particular, that include exposed and underground waters of origin carstic. The aquatic fauna of the cenotes and caves yucatecos has been studied from…
Fecha:	2013-08-07
Recurso:	Facultad de Ciencias - UNAM

Recurso libre

115.

Circulación del Golfo de México
Zambrano-Salgado, L. - Portilla-Casillas, J. - Rendón-Villalobos, R. - Jaimes de la Cruz, B. - Vidal, F. V. - Vidal, V. M. V. - Rodríguez-Espinosa, P. F.

Formato:	Artículo
Enlaces:	The Gulf 0f Mexico constitutes a natural resource of immense ecological and economic importance foe Mexico and the World (Vidal, el al., 1997). Our capacity to exploitit rationallydepends on our knowledge of its nature, fundamentally of its circulation system, amongst…
Fecha:	2013-08-07
Recurso:	Facultad de Ciencias - UNAM

Recurso libre

116.

The effect of Maya traditional harvesting on the leaf production, and demographic parameters of Sabal palm in the Yucatan Peninsula, Mexico
Martínez-Ballesté, A - Martorell-Delgado, Carlos - Caballero, J

Formato:	Article
Enlaces:	Palm leaves are an important resource for family households. The effect of harvest on leaf production, growth and fecundity of wild individual palm trees has been studied, but little is known about palm harvest in agro-forestry systems. In the Maya…
Fecha:	2011-01-22
Recurso:	Facultad de Ciencias - UNAM

Recurso libre

117.

Mexican native trouts: a review of their history and current systematic and conservation status
Hendrickson, DA - Perez, HE - Findley, LT - Forbes, W - Tomelleri, JR - Mayden, RL - Nielsen, JL - Jensen, B - Campos, GR - Romero, AV - van der Heiden, A - Camarena, F - de Leon, FJG

Formato:	Article
Enlaces:	While biologists have been aware of the existence of native Mexican trouts for over a century, they have received little study. The few early studies that did muchmore than mention their existence began in the 1930s and continued into the…
Fecha:	2011-01-22
Recurso:	Facultad de Ciencias - UNAM

Recurso libre

118.

A comparison of traditional elasticity and variance-standardized perturbation analyses: a case study with the tropical tree species Manilkara zapota (Sapotaceae)
Cruz-Rodríguez, JA - López-Mata, L - Valverde-Valdés, María Teresa

Formato:	Article
Enlaces:	Knowledge of the population dynamics of tropical trees has expanded considerably in the past 20 years. An important observation deriving from these investigations is the confirmation that population behaviour varies both in time and space. A tool recently developed to…
Fecha:	2013-04-05
Recurso:	Facultad de Ciencias - UNAM

Recurso libre

119.

Aportaciones recientes al conocimiento de la biogía y distribución de Phocoena sinus (Cetacea:Phocoenidae)
Villa-R, B. - Delgado-Estrella, A. - Peralta-Pérez, M.

Formato:	Artículo
Enlaces:	Through the use of line transects on boats, contributions to the knowledge of vaquita Phocoena sinus distribution were made. Sightings made confirm the presence of vaquita near Rocas Consag. Stranded individuals were collected for anatomical, morphometric, and age estimation studies.…
Fecha:	2013-08-07
Recurso:	Facultad de Ciencias - UNAM

Recurso libre

120.

Sinopsis de los mamíferos del Estado de México, México
Ramírez-Pulido, J. - Castro-Campillo, A. - Aguilera, U.

Formato:	Artículo
Enlaces:	The mammalian fauna of the State of Mexico is included in 20 families 61 genera and 103 species. Here we make a retrospective analysis and present an updated taxonomic checklist of the mammals of the state. In the list, the…
Fecha:	2013-08-07
Recurso:	Facultad de Ciencias - UNAM

Recurso libre

121.

La importancia de los estudios regionales de circulación en el Golfo de México
Vidal, V. M. V. - Vidal, F. V.

Formato:	Artículo
Enlaces:	The Gulf of Mexico engenders; a preponderant economie. ecological, oceanographic, and strategic importance. It constitutes an excellent physical laboratory within which major oceanographic processes can be studied aiid extrapolated to other parts of the world's, oceans. Given its geographical location…
Fecha:	2013-08-07
Recurso:	Facultad de Ciencias - UNAM