DISTRIBUCION ALTITUDINAL DE LA MASTOFAUNA EN LA RESERVA DE LA BIOSFERA "EL CIELO", TAMAULIPAS, MEXICO

The Biosphere Reserve "El Cielo" is one of the most important areas in Tamaulipas, Mexico, holding a rich biodiversity. This reserve embraces tropical semideciduous forest, cloud forest, pine-oak forest and dry scrub, which possess a unique fauna. Here, we determined which mammals were associated to each vegetation type. We observed five distributional patterns for mammals along an elevational gradient: four species with a wide distribution, seven species with a medium distribution, 31 species with a reduced distribution, 12 species with leap frog distribution, and 42 species with a specific distribution. Furthermore, tropical semideciduous forest have more species (19) with specific distribution that cloud forest (10), dry scrub (9), and pine-oak forest (4). Simpson’s index was used to measure species similarity among habitats. A high percentage of shared species was found between tropical deciduous forest and cloud forest (72.54%), in comparison with other habitats; whose values varied between 28.57 and 58.33%. Meanwhile, pine-oak forest and dry scrub shared few species with other habitats and their values of similarity are between 28.57 and 58.33%. Thus, the Biosphere Reserve "El Cielo" mammals’ are clustered in three groups: tropical semideciduous forest-cloud forest, pine-oak forest, and dry scrub mammals.La Reserva de la Biosfera "El Cielo" alberga uno de los acervos más importantes de la biodiversidad en el estado de Tamaulipas, México. En esta reserva se pueden encontrar cuatro tipos de vegetación (bosque tropical subcaducifolio, bosque mesófilo de montaña, bosque de encino-pino y matorral xerófilo), a los que están aunados una fauna característica. Este estudio determinó las especies de mamíferos asociadas a cada tipo de vegetación. Se detectó que los mamíferos presentan una distribución diferencial en un gradiente altitudinal en cinco patrones: cuatro especies de distribución amplia, siete especies de distribución media, 31 especies de distribución reducida, 12 especies de distribución salteada y 42 especies de distribución específica. Además, el bosque tropical subcaducifolio contiene el mayor número de especies con distribución específica, seguido por el bosque mesófilo de montaña, matorral xerófilo y bosque de encino-pino con diez, nueve y cuatro, respectivamente. Se empleó el índice porcentual de Simpson para calcular la similitud mastofaunística entre hábitats y se obtuvo que el bosque tropical y el bosque mesófilo presentan un mayor porcentaje (72.54%) de especies en común. En tanto que el bosque de encino pino y el matorral xerófilo comparten menos especies con otros hábitats y sus valores de similitud fluctúan de 28.57 a 58.33%. Así, los mamíferos de esta reserva están asociados en tres grupos: los del bosque tropical subcaducifolio-bosque mesófilo de montaña, los del bosque encino pino y los del matorral xerófilo

Primer registro del zorrillo manchado del sur spilogale angustifrons howell 1902 para el estado de Campeche, México

We found two roadside-killed individuals of Southern Spotted Skunk Spilogale angustifrons in the Calakmul region Campeche, Mexico (one, on the road Dziblachén-Xpujil, and the other, on the road to Calakmul archeological site). This information represents the first record for this species in this Mexican state and the extension of its distributional range.We found two roadside-killed individuals of Southern Spotted Skunk Spilogale angustifrons in the Calakmul region Campeche, Mexico (one, on the road Dziblachén-Xpujil, and the other, on the road to Calakmul archeological site). This information represents the first record for this species in this Mexican state and the extension of its distributional range

Frecuencia elevada del alelo ε4 del gen de apolipoproteína E en una muestra de pacientes con síndrome Down

La enfermedad de Alzheimer es la entidad más frecuente enpacientes con síndrome Down (SD) y a su vez uno de losfactores de riesgo para el desarrollo de esta entidad es lapresencia del alelo ε4 de apolipoproteína E. En el presenteestudio se evaluó el genotipo de apolipoproteína E en ungrupo de pacientes de ambos sexos con síndrome Down.Los resultados muestran que hay una frecuencia aumentadapara el alelo ε4 en esta población cuando se hizo la comparacióncon los valores previamente encontrados para unamuestra de la población del Departamento de Risaralda queno presentaban SD la cual se tomó como control

Frecuencia elevada del alelo ε4 del gen de apolipoproteína E en una muestra de pacientes con síndrome Down

La enfermedad de Alzheimer es la entidad más frecuente enpacientes con síndrome Down (SD) y a su vez uno de losfactores de riesgo para el desarrollo de esta entidad es lapresencia del alelo ε4 de apolipoproteína E. En el presenteestudio se evaluó el genotipo de apolipoproteína E en ungrupo de pacientes de ambos sexos con síndrome Down.Los resultados muestran que hay una frecuencia aumentadapara el alelo ε4 en esta población cuando se hizo la comparacióncon los valores previamente encontrados para unamuestra de la población del Departamento de Risaralda queno presentaban SD la cual se tomó como control

Frecuencia elevada del alelo ε4 del gen de apolipoproteína E en una muestra de pacientes con síndrome Down

La enfermedad de Alzheimer es la entidad más frecuente enpacientes con síndrome Down (SD) y a su vez uno de losfactores de riesgo para el desarrollo de esta entidad es lapresencia del alelo ε4 de apolipoproteína E. En el presenteestudio se evaluó el genotipo de apolipoproteína E en ungrupo de pacientes de ambos sexos con síndrome Down.Los resultados muestran que hay una frecuencia aumentadapara el alelo ε4 en esta población cuando se hizo la comparacióncon los valores previamente encontrados para unamuestra de la población del Departamento de Risaralda queno presentaban SD la cual se tomó como control

Oral Melanoacanthoma And Oral Melanotic Macule: A Report Of 8 Cases, Review Of The Literature, And Immunohistochemical Analysis

Oral melanoacanthoma (MA) is a rare, benign pigmented lesion, similar to cutaneous MA, characterized by hyperplasia of spinous keratinocytes and dendritic melanocytes. The pathogenesis of oral MA remains uncertain, although its clinical behavior is suggestive of a reactive origin. The most common intraoral sites are the buccal mucosa, lip, palate and gingiva. The average age of presentation is 28 years, mainly in blacks, with a strong female predilection. The oral melanotic macule (MM) is a small, well-circumscribed brown-to-black macule that occurs on the lips and mucous membranes. The etiology is not clear and it may represent a physiologic or reactive process. The average age of presentation is 43 years, with a female predilection. A biopsy is recommended to distinguish these lesions from each other and from other oral melanocytic lesions. We depict four cases each of oral MA and MM, affecting Caucasian and Latin American mestizo patients. The clinicopathological features of these cases reflect its ample spectrum, and to the best of our knowledge, it is the first example of oral MA affecting a Caucasian boy reported in the English literature. Therefore oral MA and MM should be considered in the differential diagnosis of pigmented lesions in the oral mucosa in these populations. © Medicina Oral.125E374E379Mishima, Y., Pinkus, H., Benign mixed tumor of melanocytes and malpighian cells. Melanoacanthoma: Its relationship to Bloch's benign non-nevoid melanoepithelioma (1960) Arch Dermatol, 81, pp. 539-550Buchner, A., Merrell, P.W., Carpenter, W.M., Relative frequency of solitary melanocytic lesions of the oral mucosa (2004) J Oral Pathol Med, 33, pp. 550-557Wright, J.M., Binnie, W.H., Byrd, D.L., Dunsworth, A.R., Intraoral melanoacanthomas (1983) J Periodontol, 54, pp. 107-111Buchner, A., Merrell, P., Hanson, L., Leider, A., Melanocytic hyperplasia of the oral mucosa (1991) Oral Surg, Oral Med Oral Pathol, 71, pp. 58-62Wright, J.M., Intraoral melanoacanthoma: A reactive melanocytic hyperplasia. Case report (1988) J Periodontol, 59, pp. 53-55Tomich, C., Zunt, S.L., Melanoacanthosis (melanoacanthoma) of the oral mucosa (1990) J Dermatol Surg Oncol, 16, pp. 231-236Contreras, E., Carlos, R., Oral melanoacanthosis (melanoachantoma): Report of a case and review of the literature (2005) Med Oral Patol Oral Cir Bucal, 10 (1), pp. 11-12,9-11Fornatora, M.L., Reich, R.F., Haber, S., Solomon, F., Freedman, P.D., Oral melanoacanthomas: A report of 10 cases, review of the literature, and immunohistochemical analysis for HMB-45 reactivity (2003) Am J Dermatopathol, 25, pp. 12-15Matsuoka, L.Y., Glasser, S., Barsky, S., Melanoacanthoma of the lip (1979) Arch Dermatol, 115, pp. 1116-1117Goode, R.K., Crawford, B.E., Callihan, M.D., Neville, B.W., Oral melanoacanthoma. Review of the literature and report of ten cases (1983) Oral Surg Oral Med Oral Pathol, 56, pp. 622-628Scheneider, L.C., Mesa, M.L., Haber, S.M., Melanoacanthoma of the oral mucosa (1981) Oral Surg Oral Med Oral Pathol, 52, pp. 284-287Fatahzadeh, M., Sirois, D.A., Multiple intraoral melanoacanthomas: A case report with unusual findings (2002) Oral Surg Oral Med Oral Pathol Oral Radiol Endod, 94, pp. 54-56Ho, K.K., Dervan, P., O'Loughlin, S., Powell, F.C., Labial melanotic macule: A clinical, histopathologic, and ultrastructural study (1993) J Am Acad of Dermatol, 28, pp. 33-39Sexton, F.M., Maize, J.C., Melanotic macules and melanoacanthomas of the lip. A comparative study with census of the basal melanocyte population (1987) Am J Dermatopathol, 9, pp. 438-444Horlick, H.P., Walther, R.R., Zegarelli, D.J., Silvers, D.N., Eliezri, Y.D., Mucosal melanotic macule, reactive type: A simulation of melanoma (1988) J Am Acad Dermatol, 19, pp. 786-791Buchner, A., Hansen, L.S., Pigmented nevi of the oral mucosa: A clinicopathologic study of 32 new cases and review of 75 cases from the literature: Part I. A clinicopathologic study of 32 new cases (1979) Oral Surg Oral Med Oral Pathol, 48, pp. 131-142Barker, B.F., Carpenter, W.M., Daniels, T.E., Kahn, M.A., Leider, A.S., Lozada-Nur, F., (1997) Oral mucosal melanomas: The WESTOP Banff workshop proceedings, 83, pp. 672-679. , Western Society of Teachers of Oral Pathology. Oral Surg Oral Med Oral Pathol Oral Radiol EndodBarrett, A.W., Raja, A.M., The immunohistochemical identification of human oral mucosal melanocytes (1997) Arch Oral Biol, 42, pp. 77-8

Search for the standard model Higgs boson in the H to ZZ to 2l 2nu channel in pp collisions at sqrt(s) = 7 TeV

A search for the standard model Higgs boson in the H to ZZ to 2l 2nu decay channel, where l = e or mu, in pp collisions at a center-of-mass energy of 7 TeV is presented. The data were collected at the LHC, with the CMS detector, and correspond to an integrated luminosity of 4.6 inverse femtobarns. No significant excess is observed above the background expectation, and upper limits are set on the Higgs boson production cross section. The presence of the standard model Higgs boson with a mass in the 270-440 GeV range is excluded at 95% confidence level.Comment: Submitted to JHE

Combined search for the quarks of a sequential fourth generation

Results are presented from a search for a fourth generation of quarks produced singly or in pairs in a data set corresponding to an integrated luminosity of 5 inverse femtobarns recorded by the CMS experiment at the LHC in 2011. A novel strategy has been developed for a combined search for quarks of the up and down type in decay channels with at least one isolated muon or electron. Limits on the mass of the fourth-generation quarks and the relevant Cabibbo-Kobayashi-Maskawa matrix elements are derived in the context of a simple extension of the standard model with a sequential fourth generation of fermions. The existence of mass-degenerate fourth-generation quarks with masses below 685 GeV is excluded at 95% confidence level for minimal off-diagonal mixing between the third- and the fourth-generation quarks. With a mass difference of 25 GeV between the quark masses, the obtained limit on the masses of the fourth-generation quarks shifts by about +/- 20 GeV. These results significantly reduce the allowed parameter space for a fourth generation of fermions.Comment: Replaced with published version. Added journal reference and DO

Measurement of the t t-bar production cross section in the dilepton channel in pp collisions at sqrt(s) = 7 TeV

The t t-bar production cross section (sigma[t t-bar]) is measured in proton-proton collisions at sqrt(s) = 7 TeV in data collected by the CMS experiment, corresponding to an integrated luminosity of 2.3 inverse femtobarns. The measurement is performed in events with two leptons (electrons or muons) in the final state, at least two jets identified as jets originating from b quarks, and the presence of an imbalance in transverse momentum. The measured value of sigma[t t-bar] for a top-quark mass of 172.5 GeV is 161.9 +/- 2.5 (stat.) +5.1/-5.0 (syst.) +/- 3.6(lumi.) pb, consistent with the prediction of the standard model.Comment: Replaced with published version. Included journal reference and DO

Search for anomalous t t-bar production in the highly-boosted all-hadronic final state

A search is presented for a massive particle, generically referred to as a Z', decaying into a t t-bar pair. The search focuses on Z' resonances that are sufficiently massive to produce highly Lorentz-boosted top quarks, which yield collimated decay products that are partially or fully merged into single jets. The analysis uses new methods to analyze jet substructure, providing suppression of the non-top multijet backgrounds. The analysis is based on a data sample of proton-proton collisions at a center-of-mass energy of 7 TeV, corresponding to an integrated luminosity of 5 inverse femtobarns. Upper limits in the range of 1 pb are set on the product of the production cross section and branching fraction for a topcolor Z' modeled for several widths, as well as for a Randall--Sundrum Kaluza--Klein gluon. In addition, the results constrain any enhancement in t t-bar production beyond expectations of the standard model for t t-bar invariant masses larger than 1 TeV.Comment: Submitted to the Journal of High Energy Physics; this version includes a minor typo correction that will be submitted as an erratu