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7 results on '"México"'

1. Leaf growth and biomass accumulation in radish inoculated with rhizosphere microorganisms

Author

Luis Alfredo Rodríguez-Larramendi, Francisco Guevara Hernández, Manuel Alejandro La O-Arias, Luis Reyes-Muro, Rady Alejandra Campos-Saldaña, and Miguel Ángel Salas-Marina

Subjects
México, Raphanus sativus L, fungi, food and beverages, Agriculture, TP368-456, Food processing and manufacture, tasa de crecimiento relativa de bacterias, hongos rizosféricos y tasa de crecimiento relativa, tasa de asimilación neta, hongos rizosféricos y tasa de crecimiento relativa, tasa de asimilación neta, bacteria, México
Abstract

Seeds of Raphanus sativus L. var. Champion were inoculated with commercial strains of rhizospheric fungi+bacteria. A completely randomized experiment was designed with four treatments: Chromobacterium violaceum+Acinetobacter calcoaceticus (BiofosfoBuap®, T1), Azospirillum brasilense (AzoFer), Glomus intraradices (MicorrizaFer), and uninoculated control. Each treatment had 20 replicates. The objective was to evaluate the effect of the different treatments on leaf growth, taproot length and dry weight, dry weight of leaves and tubers, and fresh tuber weight. Net assimilation rate (NAR), absolute growth rate (AGR), and relative growth rate (RGR) were calculated. Thirty three days after sowing (das), plants inoculated with C. violaceum+A. calcoaceticus had 52.67% more leaf area than the control, and 42 das they had 72.30% more leaf area. Thirty three das, treatments with C. violaceum+A. calcoaceticus and A. brasilense had 49.66% and 45.52% more dry leaf weight than the control. Fresh weight of tubers for the same two treatments was 65.03% and 63.11% higher than the control 33 das, respectively, and 80.70% and 74.56% higher 42 das. Co-inoculation with C. violaceum+A. calcoaceticus and inoculation with A. brasilense alone promoted growth of radish tubers as a consequence of increased leaf area and biomass as well as an increase in net assimilation rate. Highlights The effect of rhizosphere bacteria and fungi on the leaf area of radish plants depends more on the leaves size than on the leaves number produced by the plant. The better growth observed in plants inoculated with C. violaceum + A. calcoaceticus and A. brasilense might depend on the greater plant hormone synthesis. The effects of C. violaceum + A. calcoaceticus on plant growth are better than a single microorganism inoculation and such effects depend on the enhanced co-inoculation. Inoculating plants with C. violaceum + A. calcoaceticus promotes the tuber biomass increase over the taproot growth. Inoculation with C. violaceum + A. calcoaceticus induces transfer of photosynthates from above ground part of the plant to the tuber in order to produce biomass. Inoculation with C. violaceum + A. calcoaceticus favored accumulation of biomass in leaves and tubers, resulting in total plant biomass production, although not taproot length.

Published
2020

2. REPRODUCTIVE SEASONALITY OF SHEEP IN MEXICO

Author

Jaime Arroyo

Subjects
Reproductive seasonality, seasonal anestrous, sheep, neuroendocrinology, México, Agriculture, Agriculture (General), S1-972
Abstract

In order to discuss and analyze the available information concerning the seasonal breeding behavior of sheep in Mexico, this review was conducted. We analyzed the neuroendocrine basis that modulate the annual reproductive cycle in sheep and then discussed the degree of reproductive seasonality in Creole sheep wool, breeds originating in high latitudes and hair sheep, mainly in Pelibuey ewes. The Creole sheep wool show continuous annual reproductive activity and short seasonal anestrous. The females of northern origin, express seasonal reproductive activity, similar to that observed in individuals geographically located at latitudes above 35º. Pelibuey sheep show variable annual reproductive behavior with reduced anestrus or lack thereof.  It is suggested that the neuroendocrine mechanisms regulating seasonal anestrus in ewes, are active in the sheep of northern origin that live in Mexico, in a manner contrary is not activated in Creole and hair sheep.

Published
2011

3. Validity and reliability of the International Physical Activity Questionnaire among adults in Mexico.

Author

Medina, Catalina, Barquera, Simón, and Janssen, Ian

Subjects
*ACCELEROMETRY, *CONFIDENCE intervals, *QUESTIONNAIRES, *REGRESSION analysis, *RESEARCH funding, *STATISTICAL sampling, *SELF-evaluation, *T-test (Statistics), *BODY mass index, *PRE-tests & post-tests, *CROSS-sectional method, *RESEARCH methodology evaluation, *PHYSICAL activity, *DATA analysis software, *DESCRIPTIVE statistics, *EQUIPMENT & supplies, RESEARCH evaluation
Abstract

Objective. To determine the test-retest reliability and validity of the Spanish version of the short-form International Physical Activity Questionnaire (IPAQ) among adults in Mexico.Methods. This was a cross-sectional study of a convenience sample of 267 adult factory workers in Mexico City. Participants were 19–68 years of age; 48% were female. Participants wore an accelerometer for 9 consecutive days and were administered the Spanish version of the short form IPAQ on two occasions (IPAQ1 and IPAQ2, separated by 9 days). The relation and differences between moderate-to-vigorous physical activity (MVPA) measures obtained from IPAQ1, IPAQ2, and the accelerometer were determined using correlations, linear regression, and paired t-tests. Results. IPAQ1 and IPAQ2 measures of MVPA were significantly correlated to each other (r = 0.55, P < 0.01). However, MVPA was 44 ± 408 minutes/week lower in IPAQ1 than in IPAQ2, although this difference did not reach statistical significance (P = 0.08). The (min/week) measures from IPAQ1 and IPAQ2 were only modestly correlated with the accelerometer measures (r = 0.26 and r = 0.31, P < 0.01), and by comparison to accelerometer measures, MVPA values were higher when based on IPAQ1 (174 ± 357 min/week, P < 0.01) than for IPAQ2 (135 ± 360 min/week, P < 0.01). The percentage of participants who were classified as physically inactive according to the World Health Organization guidelines was 18.0% in IPAQ1, 25.1% in IPAQ2, and 28.2% based on the accelerometer.Conclusions. Similar to what has been observed in other populations, the short form IPAQ has a modest reliability and poor validity for assessing MVPA among Mexican adults. [ABSTRACT FROM AUTHOR]

Published
2013

4. Vulnerabilidad de los flujos migratorios que ingresan por la frontera sur de México y las opciones estratégicas adoptadas por el gobierno federal para salvaguardar sus derechos humanos

Author

Juárez Romero, Adán and Juárez Romero, Adán

Subjects
Fronteras, Estados Unidos, Migración, México
Abstract

Tesis de maestría para acceder al título de Magíster en Estrategia y Geopolítica presenta el Maestrando Adán Juárez Romero. Director de Tesis: Coronel Justino Bertotto Fil: Juárez Romero, Adán Juárez Romero, A. (2018). Vulnerabilidad de los flujos migratorios que ingresan por la frontera sur de México y las opciones estratégicas adoptadas por el gobierno federal para salvaguardar sus derechos humanos (Tesis de maestría). Escuela Superior de Guerra Tte Grl Luis María Campos. Ciudad Autónoma de Buenos Aires.

Published
2018

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