Agronomic Potential and Nutritive Value of Promising \u3ci\u3eLeucaena\u3c/i\u3e Species in the Yucatan Peninsula

Two experiments were carried out in order to evaluate the agronomic potential, the nutritive value and the tolerance to psyllid (Heteropsilla cubana) of nine Leucaena species. A randomized block design with four repetitions was used. There were significant (P\u3c 0.01) differences on dry matter production (i.e. leaf and twigs yield ). L. collinsii showed the most promising result, which could be related to its high psyllid tolerance. In a second experiment, the preference indices of Leucaena species was assessed with sixteen male pelibuey sheep in a cafeteria trial. There were significant (P\u3c 0.0001) differences among Leucaena species. L. esculenta paniculata was the species most preferred . There was no relationship between chemical composition (i.e. ADF, NDF, and polyphenols) and preference and psyllid tolerance

A statistical analysis of electric self-potential time series associated to two 1993 earthquakes in Mexico

Recent studies related with earthquake prediction involve statistical studies of the ground electric self-potential behavior. Published results about the complexity of this kind of processes encourage us to study the statistical behavior of the ground electric self-potential recorded in Guerrero state, Mexico. This region is characterized by high seismicity. The electric self-potential variations were recorded in the Acapulco station directly from the ground. The sampling period was four seconds and the data were stored from March to December of 1993. Two significant earthquakes (EQs) occurred near this station, 15 May and 24 October whose magnitudes were Mw=6.0 and Mw=6.6 respectively. A preliminary processing was carried out consisting of a moving average of the original time series in order to filter the very high frequencies and to complete short lacks of data and outliers. Then, a visual inspection of the complete filtered signal was performed to search some seismic electric signals (SES), which were ambiguously depicted. Subsequently, a detrending of µ=0 was applied with the windows of 3.3, 6.6 and 10 h. Later, the analysis of the spectral exponent β was made, showing changes during the total period examined, and the most evident changes occurred during the preparation mechanism of the Mw=6.6 EQ. Fifteen days before the 24 October EQ, a Brownian-noise like behavior was displayed (β≈2), having a duration of about two days. In addition a Higuchi fractal method and wavelet analysis were made confirming the presence of the β-anomaly

Project fuse aerial suppression experiments

Preprin

Charged Higgs in 3-3-1 Model Through e−e+e^-e^+ Collisions

In this work we present an analysis of production and signature of charged Higgs bosons $H_2^{\pm}$ in the version of the 3-3-1 model containing heavy leptons at the CLIC (Cern Linear Collider). The production rate is found to be significant for the direct production of $e^{-} e^{+} \rightarrow H_{2}^{+} H_{2}^{-}$. We also studied the possibility to identify it using their respective branching ratios.Comment: 16 pages, 9 Figures. arXiv admin note: substantial text overlap with arXiv:1408.5944; text overlap with arXiv:1311.0845, arXiv:1205.404

Mental health and use of psychoactive substances in colombian adolescents

Introducción. Se ha propuesto una estrecha asociación entre trastornos del afecto y ansiedad en adolescentes con consumo de sustancias. Objetivo. Determinar la prevalencia del consumo de sustancias psicoactivas y los trastornos mentales más frecuentes asociados este consumo, en adolescentes colombianos. Metodología. Estudio transversal, con datos de la Encuesta Nacional de Salud Mental 2015. Con adolescentes entre 12 y 17 años, en quienes se les aplicó CIDI-CAPI (versión 21.1.3) asistida por computador y Assist modificado. Resultados. Se describió información de 408 adolescentes entre 12 y 17 años que reportan consumo de sustancias psicoactivas por lo menos una vez en la vida, siendo una muestra representativa a nivel nacional. Se encontró que la sustancia de mayor consumo fue el alcohol con una prevalencia de 16,6% (IC95% 14,2-19,2), Bogotá constituye la región con mayor consumo de sustancias con una prevalencia de 33,8% (IC95% 24,7-44,2). Ser hombre entre los 16 y 17 años representa un factor de riesgo para consumo de sustancias, así mismo, presentar trastornos del afecto como depresión y ansiedad aumenta 2,28 y 1,62 veces el riesgo de consumo de sustancias psicoactivas respectivamente. Conclusiones. La población adolescente con trastornos del afecto como depresión y ansiedad se encuentra en mayor riesgo de consumir sustancias psicoactivas.Q397-106AdolecentesIntroduction. An association between affective and anxiety disorders has been proposed in adolescents with substance use. Objective. To determine the prevalence of psychoactive substance use and the most frequent mental disorders associated with this consumption, in Colombian adolescents. Methods. This is a cross-sectional study that uses data from the National Mental Health Survey 2015. With adolescents between 12 and 17 years old, in whom CIDI-CAPI (version 21.1.3) was applied by computer and modified ASSIST. Results. A total of 408 adolescents between 12 and 17 years old who reported psychoactive substance use at least once in their lives were described, this group was a representative sample of national population. The most frequent consumed substance was alcohol with a prevalence of 16.6% (95% CI, 14.2-19.2), Bogotá is the region with the highest consumption of substances with a prevalence of 33.8% (IC95 % 24.7-44.2). Otherwise, being a man between 16 and 17 years old represents a risk factor for substance use. Likewise, presenting affective disorders increases by 2.28 times the risk of psychoactive substance use. Conclusions. Adolescents with affective or anxiety disorders are at higher risk of psychoactive substances use, making difficult the treatment and desmonstrating the vulnerability of this population

Advances in the phylogenetic study of the tribe Cinchoneae (Rubiaceae) with emphasis on the genus Cinchona and Ladenbergia

In its current circumscription, the Cinchoneae tribe includes 9 genera of neotropical distribution. Its species occur mostly in the Andes in South America, with few reaching Central America. Preliminary phylogenetic studies have suggested the monophyly of Cinchoneae but intrageneric relationships are still debatable. In this study, we sampled 8 genera of Cinchoneae (with ca 50% of species for Cinchona and Ladenbergia) and obtained multiple single-copy nuclear loci (ca 207 genes) by using the “Angiosperm353 universal probe set”, which was complemented with a taxonomic review of Cinchoneae. Phylogenetic inferences were realized with multispecies pseudo-coalescent (ASTRAL III) and gene concatenation analysis (ML). Our results strongly support the monophyly of the tribe and most of the genera, except for Ladenbergia. Furthermore, Ciliosemina, Ladenbergia, and Remijia formed a clade, although the position of Ciliosemina (= Remijia pedunculata) and Ladenbergia muzonensis is still elusive. The position of Ladenbergia muzonensis is intriguing due to its intermedíate floral morphology, which resembles both Remijia and Ladenbergia species. Additionally, our phylogeny also supports the recognition of a new species in Cinchona. Finally, our results show that sequencing data using the probe set designed for multiple gene capture is a useful tool for phylogenetic reconstructions in taxonomically complex groups