Navigational Trip: Safety, Security, and Protection as Compliance to Interntional Standard

This study was determined the evaluation of the safety, security, and protection of the navigational trip in terms of safety among marine engineering students as an entire group and when they were classified according to section such as Polaris 3-A, Polaris 3-B, and Polaris 3-C. Respondents of the study were the one hundred twenty (120) Polaris marine engineering students who are currently enrolled in the College of Maritime Education of JBLFMU-Molo for School Year 2017-2018 who were on board or have undertaken the navigational trip and have observed some of the safety and security services on board. The researchers employed quantitative-qualitative research design by Creswell (2013) to determine the navigational trip and observations of the safety and security services on board. Results revealed that the respondents had “excellent evaluation” about the safety, protection, and security of the navigational trip vessel. There were no significant differences in the evaluation of the respondents as to the different sections; no relationships were observed when the respondents’ evaluation results were compared according to sections. The observations and comments cited in this study signify that the navigational trip vessel exhibited safety and security, maintain clean and safe environment, and followed the strict implementation of safety as prescribed by the international standards. The respondents’ comments attested that the navigational ship has implemented the international standard of safety and procedure on board

La Iglesia católica en México desde sus historiadores (1960-2010)

El texto aborda de manera detallada las diversas tradiciones, consagradas y laicas, que han predominado en la historiografía sobre la Iglesia católica en México. Se efectúa un recuento de las historiografías, publicadas por diferentes autores, para no ignorar los esfuerzos realizados para sistematizar las trayectorias de los estudios sobre la Iglesia. Para facilitar el análisis y comprensión de las publicaciones de los últimos 50 años, la narrativa se articuló en torno a ejes, tanto temáticos como cronológicos. Esa metodología permitió presentar los avances historiográficos, del siglo xvi al xxi, y las grandes lagunas que todavía existen.This paper discusses in detail the various traditions, both clerical and secular, that have dominated the historiography of the Catholic Church in Mexico. The text does recount the historiographies published by different authors, to underline the efforts to systematize the studies on the Catholic Church. To facilitate the analysis and understanding of the publications of the last 50 years, the narrative is articulated around axes, both thematic and chronological. This methodology allowed presenting the historiographical advances, between the 16th century to the 21st century, and the large gaps that still exist

Bulk dynamics for interfacial growth models

We study the influence of the bulk dynamics of a growing cluster of particles on the properties of its interface. First, we define a {\it general bulk growth model} by means of a continuum Master equation for the evolution of the bulk density field. This general model just considers arbitrary addition of particles (though it can be easily generalized to consider substraction) with no other physical restriction. The corresponding Langevin equation for this bulk density field is derived where the influence of the bulk dynamics is explicitly shown. Finally, when it is assumed a well-defined interface for the growing cluster, the Langevin equation for the height field of this interface for some particular bulk dynamics is written. In particular, we obtain the celebrated Kardar-Parisi-Zhang (KPZ) equation. A Monte Carlo simulation illustrates the theoretical results.Comment: 6 pages, 2 figure

Functional characterization of a melon alcohol acyl-transferase gene family involved in the biosynthesis of ester volatiles. Identification of the crucial role of a threonine residue for enzyme activity

Volatile esters, a major class of compounds contributing to the aroma of many fruit, are synthesized by alcohol acyl-transferases (AAT). We demonstrate here that, in Charentais melon (Cucumis melo var. cantalupensis), AAT are encoded by a gene family of at least four members with amino acid identity ranging from 84% (Cm-AAT1/Cm-AAT2) and 58% (Cm-AAT1/Cm-AAT3) to only 22% (Cm-AAT1/Cm-AAT4). All encoded proteins, except Cm-AAT2, were enzymatically active upon expression in yeast and show differential substrate preferences. Cm-AAT1 protein produces a wide range of short and long-chain acyl esters but has strong preference for the formation of E-2-hexenyl acetate and hexyl hexanoate. Cm-AAT3 also accepts a wide range of substrates but with very strong preference for producing benzyl acetate. Cm-AAT4 is almost exclusively devoted to the formation of acetates, with strong preference for cinnamoyl acetate. Site directed mutagenesis demonstrated that the failure of Cm-AAT2 to produce volatile esters is related to the presence of a 268-alanine residue instead of threonine as in all active AAT proteins. Mutating 268-A into 268-T of Cm-AAT2 restored enzyme activity, while mutating 268-T into 268-A abolished activity of Cm-AAT1. Activities of all three proteins measured with the prefered substrates sharply increase during fruit ripening. The expression of all Cm-AAT genes is up-regulated during ripening and inhibited in antisense ACC oxidase melons and in fruit treated with the ethylene antagonist 1-methylcyclopropene (1-MCP), indicating a positive regulation by ethylene. The data presented in this work suggest that the multiplicity of AAT genes accounts for the great diversity of esters formed in melon

Evaluación de estirpes bacterianas para la formación de consorcio probiótico para uso en el cultivo de camarones marinos: Litopenaeus vannamei / Evaluation of bacterial strains for the formation of a probiotic consortium for use in the cultivation of marine shrimps: Litopenaeus vannamei

El objetivo del presente trabajo fue evaluar estirpes bacterianas con características probióticas, aisladas del tracto intestinal de camarones marinos (Litopenaeus vannamei). Ciento noventa y una (191) estirpes fueron evaluadas para su selección basada en pruebas fenotípicas y genotípicas incluyendo: factores de virulencia (elastasa, gelatinasa, caseinasa, lípasa e fosfolipasa), tolerancia a diferentes temperaturas (4°C e 40°C) y pHs (5 e 9), prueba de susceptibilidad a antimicrobianos, prueba de agregación, antagonismo y prueba de identificación molecular  (secuenciamiento-gen 16S rRNA). Las estirpes identificadas fueron agrupadas en diferentes géneros: Bacillus, Vibrios, Staphylococcus y un grupo con representantes de diferentes géneros bacterianos. Fueron formados tres grupos bacterianos prioritarios atendiendo a la respuesta de las estirpes frente a las diferentes pruebas analizadas. La mayoría de las estirpes (66,45%) presentó resistência frente a la oxitetraciclina. Todas las estirpes presentaron susceptibilidad frente al cloranfenicol y la tetraciclina. Ninguna estirpe presentó antagonismo frente al patógeno Vibrio parahaemolyticus. De las 70 estirpes que formaron parte de los tres grupos prioritarios, 16 estirpes (22,85%) resultaron antagónicas frente a Vibrio harvey. Doce estirpes bacterianas mostraron resultados satisfactorios en la técnica de antagonismo cruzado. Fueron formados tres consorcios bacterianos con aquellas estirpes que cumplieron los requisitos como probiótico potencial

A precise measurement of the magnetic field in the corona of the black hole binary V404 Cygni

Observations of binary stars containing an accreting black hole or neutron star often show x-ray emission extending to high energies (>10 kilo­–electron volts), which is ascribed to an accretion disk corona of energetic particles akin to those seen in the solar corona. Despite their ubiquity, the physical conditions in accretion disk coronae remain poorly constrained. Using simultaneous infrared, optical, x-ray, and radio observations of the Galactic black hole system V404 Cygni, showing a rapid synchrotron cooling event in its 2015 outburst, we present a precise 461 ± 12 gauss magnetic field measurement in the corona. This measurement is substantially lower than previous estimates for such systems, providing constraints on physical models of accretion physics in black hole and neutron star binary systems. This article has a correction. Please see: http://science.sciencemag.org/content/360/6386/eaat927