ALERTA BIBLIOGRÁFICA: DOCUMENTOS PUBLICADOS POR PERSONAL ACADÉMICO DEL COLEGIO DE POSTGRADUADOS QUE HAN SIDO INDIZADOS EN LAS BASES DE DATOS SCIENCE CITATION INDEX EXPANDED (SCIE) Y SOCIAL SCIENCES CITATION INDEX (SSCI) DEL WEB DE LA CIENCIA DEL 1° DE ENERO AL 14 FEBRERO 2020
DR. ANGEL BRAVO VINAJA[1]
ALMENDRA-ARAO, Felix and SOTRES-RAMOS, David, 2020. Comment on: Ripamonti E, Lloyd CJ. Tests for noninferiority trials with binomial endpoints: A guide to modern and quasi-exact methods for biomedical researchers. Pharm Stat 2019;18:377-387. https://onlinelibrary.wiley.com/doi/10.1002/pst.1929. Pharmaceutical Statistics [online]. 2020. Vol. First published: 12 January 2020. DOI https://doi.org/10.1002/pst.1998. Available from: https://onlinelibrary.wiley.com/doi/full/10.1002/pst.1998
ALVA-RODRÍGUEZ, Sergio, LÓPEZ-UPTON, Javier, JESÚS VARGAS-HERNÁNDEZ, J. and DEL MAR RUIZ-POSADAS, Lucero, 2020. Biomass and growth of Pinus cembroides Zucc. and Pinus orizabensis D. K. Bailey & Hawksworth in response to water deficit. Revista Chapingo Serie Ciencias Forestales y del Ambiente. April 2020. Vol. 26, no. 1, p. 71–83. DOI https://doi.org/10.5154/r.rchscfa.2019.02.015.
Introduction: Selection of plants not adapted to the environment and low water availability are factors that limit the success of reforestation. Objective: To determine drought resistance in plants from three provenances of Pinus cembroides Zucc. and three of P. orizabensis D. K. Bailey and Hawksworth. Materials and methods: An irrigation experiment (38 to 45 % moisture) and a drought experiment (30 to 36 % moisture) were established for 11 months, starting with 16-month-old plants. A split-plot experimental design consisting of two moisture environments (irrigation and drought) with replicates (four blocks) nested within them was used; in each block six populations (three per species) with 10 plants per experimental unit were evaluated. Results and discussion: The biomass in different parts of the plants was 24 to 51 % lower in drought. Pinus cembroides had greater growth in height, stem base diameter and stem and root biomass in irrigation, and greater growth in diameter and biomass of branches and root in drought than P. orizabensis. The aerial/root biomass ratio was higher in P. onzabensis, which increased by 34 % in drought In P. cembroides, roots and growth were bigger in seedlings from the most arid provenance. In P. orizabensis, the provenance with the best performance in both environments was the one from the highest elevation. Conclusion: Pinus cembroides showed greater growth and drought resistance than P. orizabensis. There are differences among provenances within each species in restrictive and non-limited moisture conditions.
ÁVILA-ANGULO, María L., GOMEZ-GUERRERO, Armando, ALDRETEI, Arnulfo, JESÚS VARGAS-HERNÁNDEZ, J., LÓPEZ-LÓPEZ, Miguel A. and HERNÁNDEZ-RUIZ, Javier, 2020. Does fertilization hardening improve the morphometric and physiological characteristics of Pinus rudis Endl. seedlings? Revista Chapingo Serie Ciencias Forestales Y Del Ambiente. April 2020. Vol. 26, no. 1, p. 141–153. DOI https://doi.org/10.5154/r.rchscfa.2019.04.031.
Introduction: One strategy to improve plant quality is fertilization hardening, which promotes the accumulation of nutrients. Objective: To evaluate hardening in Pinus rudis Endl. plants with different levels of phosphorus (P), potassium (K) and soluble fertilizer (SF) in irrigation. Materials and methods: A completely randomized design was used to test levels 0, 50 and 100 % higher than the basic dose of P, K and SF (Peters Professional (R) 4-25-35 of N, P and K, respectively); the effect was measured in plant morphometry and nutrient content. An analysis of variance and mean separation was performed with Tukey’s test (P < 0.05). Changes in nutrient accumulation in plants were detected by graphical vector analysis. Results and discussion: Ten months after the hardening process, the seedlings had a root collar diameter of 4.8 to 5.5 mm, aerial thy weight of 4.2 to 4.4 g and root thy weight of 1.1 to 1.2 g. The doses of P, K and FS did not affect the morphometry of the plant, but did affect the concentration of nutrients. Vector analysis detected luxury nutrient consumption in the order P > N > K. The highest nutrient contents were achieved with SF at a level of 100 % above the basic dose (4.25-35). Conclusion. Hardening of P. rudis plants is possible through fertilization management. The process led to additional reserves in the foliage.
CORTEZ-VILLA, Janeth, QUEVEDO-NOLASCO, Abel, ARTEAGA-RAMÍREZ, Ramon and CARRILLO-FLORES, Guillermo, 2020. Trend of meteorological drought in the state of Durango, Mexico, by the Rodionov method. Tecnología Y Ciencias Del Agua. February 2020. Vol. 11, no. 1, p. 85–131. DOI https://doi.org/10.24850/j-tyca-2020-01-03.
Drought is the natural phenomenon that affects the most people in the world, until the last consequence, the death of plants, animals, and humans. To evaluate the possible damages it causes, drought indices were developed that facilitate its quantitative analysis to carry out planning and management of water resources. However, there are currently changes in the global climate system, which cause drought conditions of greater intensity, duration, and frequency. Therefore, changes were detected with the Rodionov method in the SPEI (Standardized Precipitation Evapotranspiration Index) and SPI (Standardized Precipitation Index) indices at 6 and 12 month scales in the state of Durango, Mexico. We analyzed the trends of changes in the mean (RSI) and variance (RSSI) of the indices in 49 stations of the SPI index for 6 months and in 45 of the SPEI index for 6 months. The RSI values identified the beginning of the drought periods, most of the maximum RSI values were presented in July 1992. Trends in the frequency of RSI values decreased during the 2000-2004 period and increased during 2005-2008. The decade of greatest changes in the average was 1990-1999. The highest frequency of RSSI values was in the 1985-1989 period, the changes have remained constant during the last 20 years. The decade of greatest change in variance was 1980-1989.
CRUZ-TAMAYO, Alvar, GONZÁLEZ-GARDUÑO, Roberto, TORRES-HERNÁNDEZ, Glafiro, BECERRIL-PÉREZ, Carlos M., HERNÁNDEZ-MENDO, Omar, RAMÍREZ-BRIBIESCA, Jacinto E., LÓPEZ-ARELLANO, María E., VARGAS-MAGAÑA, Juan J. and OJEDA-ROBERTOS, Nadia F., 2020. Comparison of two phenotypical methods to segregate resistant and susceptible lambs to parasitic nematodes. Austral Journal of Veterinary Sciences. 2020. Vol. 52, no. 1, p. 9–18. DOI http://dx.doi.org/10.4067/S0719-81322020000100103.
The objective of this study was to compare two segregation methods to select resistant and susceptible female Pelibuey lambs infected naturally with gastrointestinal nematodes (GINs) in relation to their haematological and immunological response. For 6 months, faeces and blood samples were taken fortnightly from 40 grazing 5-month-old female lambs. The lambs were classified according to two methods using faecal egg count (FEC) as a phenotypical trait. In the first (reference) method (M3SE, n = 22), resistant (RES) lambs had FEC lower than the mean - 3 standard errors, the susceptible (SUS) lambs levels higher than + 3 standard errors (n = 10) and the intermediate (INT) lambs (n = 8) were categorised by having FECs between the two values. The second method (QUM) divided the population, using quartiles, into resistant (RES; 25%), intermediate (INT; 50%), and susceptible (SUS; 25%) lambs. The agreement between both methods was estimated using the Kappa index. The packed cell volume (PCV), total plasma protein (TPP) and peripheral eosinophils (EOS) were determined for each group. Serum was used to evaluate the IgA levels. PCV and TPP values were higher (P<0.01) in the RES lambs (31.5 +/- 3.4 and 6.16 +/- 0.5 g/dL by QUM, respectively, and 31.5 +/- 3.9 and 6.24 +/- 0.49 g/dL by M3SE, respectively) than the SUS lambs (28.1 +/- 4.7 and 5.94 +/- 0.5 g/d, respectively, by both methods). The EOS and IgA values increased with age. M3SE and QUM were in moderate agreement (Kappa = 0.43). We concluded that the two segregation methods allowed for the identification of the same female SUS lambs, but a greater number of animals were categorised phenotypically as resistant using the M3SE method. PCV and TPP can help to identify phenotypically resistant animals.
DELGADO-MACHUCA, Natalia, MEZA-LÁZARO, Rubí N., ROMERO-NÁPOLES, Jesús, SARMIENTO-MONROY, Carlos E., AMARILLO-SUAREZ, Angela R., BAYONA-VÁSQUEZ, Natalia J. and ZALDÍVAR- RIVERÓN, Alejandro., 2020. Genetic structure, species limits and evolution of the parasitoid wasp genus Stenocorse (Braconidae: Doryctinae) based on nuclear 3RAD and mitochondrial data. Systematic Entomology. January 2020. Vol. 45, no. 1, p. 33–47. DOI https://doi.org/10.1111/syen.12373.
Stenocorse (Braconidae: Doryctinae) is an ectoparasitoid wasp genus widely distributed from southern U.S.A. to central Argentina, which is known to attack over 60 bruchine beetle species that feed on a variety of legumes. This genus currently comprises a single described species, S. bruchivora (Crawford, 1910), though it is probably composed of additional, morphologically similar species. In this study we investigated genetic structure, species limits and evolutionary relationships of sampled populations of Stenocorse obtained along its known geographic distribution, with an emphasis on the Mexican territory. For this, we generated DNA sequences from both the mitochondrial (mt) barcoding locus and nuclear genome data obtained with the 3RAD technique. The Bayesian phylogenetic reconstructions based on the two datasets were mostly congruent, both showing clear geographic structure. Four clusters were recovered with nuclear data, which were also congruent with the geographic distribution of the samples and the species delimitation analyses. We delimited six evolutionary lineages with the two data sources, and three additional species were also delimited with the COI locus alone. Stenocorse probably originated during the mid- to early Miocene, and the diversification events that led to its current species distribution probably occurred between the early Pliocene and late Pleistocene. Our species delineation analyses, phylogenetic reconstructions and rearing records suggest that the species of Stenocorse have generalist feeding habits, contrary to what was expected due to host plant specialization of the bruchine species and the cascading effect that this could have in the species diversification of their parasitoids.
FACHAL, Laura, ASCHARD, Hugues, BEESLEY, Jonathan, Et al, 2020. Fine-mapping of 150 breast cancer risk regions identifies 191 likely target genes. Nature Genetics. January 2020. Vol. 52, no. 1. DOI https://doi.org/10.1038/s41588-019-0537-1.
Fine-mapping of causal variants and integration of epigenetic and chromatin conformation data identify likely target genes for 150 breast cancer risk regions. Genome-wide association studies have identified breast cancer risk variants in over 150 genomic regions, but the mechanisms underlying risk remain largely unknown. These regions were explored by combining association analysis with in silico genomic feature annotations. We defined 205 independent risk-associated signals with the set of credible causal variants in each one. In parallel, we used a Bayesian approach (PAINTOR) that combines genetic association, linkage disequilibrium and enriched genomic features to determine variants with high posterior probabilities of being causal. Potentially causal variants were significantly over-represented in active gene regulatory regions and transcription factor binding sites. We applied our INQUSIT pipeline for prioritizing genes as targets of those potentially causal variants, using gene expression (expression quantitative trait loci), chromatin interaction and functional annotations. Known cancer drivers, transcription factors and genes in the developmental, apoptosis, immune system and DNA integrity checkpoint gene ontology pathways were over-represented among the highest-confidence target genes.
GUERRA RAMÍREZ, Priscila, GUERRA RAMÍREZ, Diana, ZAVALETA MEJÍA, Emma, ARANDA OCAMPO, Sergio, NAVA DIAZ, Cristian and ROJAS MARTÍNEZ, Reyna Isabel, 2020. Extracts of Stevia rebaudiana against Fusarium oxysporum associated with tomato cultivation. Scientia Horticulturae. 3 January 2020. Vol. 259, p. 108683. DOI https://doi.org/10.1016/j.scienta.2019.108683.
The excessive application of agrochemicals to control phytopathogenic fungi has caused the development of resistant strains, damage to the environment and harmful effects on human health. The use of plant extracts represents an alternative to such chemicals because they have been shown to be effective in the control of phytopathogens and to be environmentally friendly since their secondary metabolites are biodegradable quickly. This study evaluated the antifungal activity of extracts of different polarity obtained from Stevie rebaudiana B. leaves against Fusarium oxysporum, a fungus that causes great losses in tomato cultivation. Hexane extract at a concentration of 833 ppm inhibited in vitro mycelial growth by more than 50%. Column chromatographic separation of the hexane extract resulted in a fraction with greater inhibitory activity and spectroscopic analysis of it revealed austroinulin to be the main component. In vivo tests with F. oxysporum infected tomato plants showed that all plants treated with the extract were taller, and had greater aerial and root dry weights that were significantly greather than those of control plants inoculated with F. oxysporum to which no extracts was applied. In treatments without F. oxysporum inoculum, applying hexane extract resulted in greater plant height and aerial dry weight. This indicates that the extracts contain secondary metabolites, including austroinulin, that not only inhibit the growth of F. oxysporum but that could also be acting as biostimulants. The aqueous, ethanol and hexane extracts added to tomato plants inoculated with F. oxysporum had an antifungal effect and were not phytotoxic.
LEYVA-OVALLE, Otto R., BELLO-BELLO, Jericó J., MURGUÍA-GONZÁLEZ, Joaquín, NÚÑEZ-PASTRANA, Rosalía and RAMÍREZ-MOSQUEDA, Marco A., 2020. Micropropagation of Guarianthe skinneri (Bateman) Dressler et W. E. Higging in Temporary Immersion Systems. 3 Biotech. January 2020. Vol. 10, no. 1, p. 26. DOI https://doi.org/10.1007/s13205-019-2010-3.
This study’s aim was to establish a protocol for the micropropagation of G. skinneri using temporary immersion system (TIS). Different concentrations of 6-Benzylaminopurine (0, 1, 2, and 3 mg L-1), three different systems of cultivate semi-solid (SS) and liquid media under partial (PI) and temporary immersion systems (TIS), different compositions of the inorganic salts, and the number of subcultures were evaluated. The results showed a maximum of 16.56 shoots per explant obtained through TIS, adjusting all the parameters evaluated in our study. One higher number of shoots per explant was observed in the micropropagation of G. skinneri TIS compared to SS and PI. While the use of 3 mg L-1 of BAP + MS (Murashige and Skoog) media was better than 3 mg L-1 of BAP VW (Vacint and Went) for the generation of a greater number of shoots per explant, 6.33 and 2.72, respectively. The immersion frequency of 2 min every 4 h allowed the production to be scaled to 8.54 shoots per explant. While it was necessary to perform three subcultures every 30 days, to obtain 16.56 shoots per explant, a rooting phase was not required due to the generation of adventitious roots during the different subcultures. However, a phase of elongation of the regenerated plants with 1/2 MS + GA3 (gibberellic acid) was needed to guarantee 100% survival in the process of acclimatization. In conclusion, this plant production system can be applied for the commercial micropropagation of this species for ornamental purposes, as well as for its reintroduction in protected natural areas.
MARTÍNEZ-GARCÍA, Nayeli, DE JESÚS RAMÍREZ-RIVERA, Emmanuel, GUADALUPE RAMON-CANUL, Lorena, SERVÍN-JUÁREZ, Roselia, LÓPEZ- ESPÍNDOLA, Mirna and ANDRÉS HERRERA-CORREDOR, José, 2020. Sweetener solutions as binding agents for amaranth bars: evolution of temporal dominance of sensory attributes. International Journal of Food Science and Technology [online]. 2020. Vol. First published: 06 January 2020. DOI https://doi.org/10.1111/ijfs.14510. Available from: https://onlinelibrary.wiley.com/doi/full/10.1111/ijfs.14510
The objective of the study was to determine the effects of replacing binding agents with commercial low-calorie sweetener solutions on the physicochemical and temporal dominance of sensations in amaranth bars. Five baked amaranth bar formulations (Sweetener-Solution-Formulated Amaranth Bars: SSFABs) were prepared using solutions of erythritol, sucralose, steviol and two sucrose concentrations (50% and 25%). A commercial bar (COMM) was used as a control. Proximal, pH, water activity, texture and colour were measured. Temporal dominance of sensations (TDS) was used to determine dominant attributes in time. In general, SSFABs showed a higher moisture, ash and protein content compared to COMM. Carbohydrates and total crude fat were lower in SSFABs than in COMM. Dominant attributes were Crispy, Dry, Sweet and Amaranth. Erythritol formulation was similar to the commercial bar in terms of maximum dominance rate. Replacement of binding agents impacted on the evolution of dominant attributes in amaranth bars.
MENDEL, Zvi, PROTASOV, Alexei, VANEGAS-RICO, Juan M., LOMELÍ-FLORES, J. Refugio, SUMA, Pompeo and RODRÍGUEZ-LEYVA, Esteban, 2020. Classical and fortuitous biological control of the prickly pear cochineal, Dactylopius opuntiae, in Israel. Biological Control. March 2020. Vol. 142, p. 104157. DOI https://doi.org/10.1016/j.biocontrol.2019.104157.
The cochineal, Dactylopius opuntiae (Hemiptera: Dactylopiidae) was first reported in Israel in 2013 in a restricted area in the upper Galilee from where, by 2018, it had spread throughout Galilee and the northern Coastal Plain. It infests and kills the Indian-fig prickly pear, Opuntia ficus-indica (Cactaceae), a prominent plant in the landscape of Israel and other Mediterranean countries. Inundative releases of industrially mass-reared Cryptolaemous montrouzieri (Coleoptera: Coccinellidae), intended to control early cochineal outbreaks have been unsuccessful. Two insect predators of D. opuntiae - Hyperaspis trifurcata (Coccinellidae) and Leucopina bellula (Diptera: Chamaemyiidae) - were collected in Mexico and sent to Israel, where both were tested against the target prey and several non-target prey species. Approximately 2500 H. trifurcata individuals were released in the summer of 2017, and 1300 L. bellula individuals in the following summer, mostly at different sites. In midsummer of 2017, a buildup of large populations of naturalized C. montrouzieri was observed in the northern Coastal Plain of Israel where, in 2018, it played a significant role in restraining the cochineal populations. Other local predatory species did not attack the cochineal. Approximately 18 months after release of H. trifurcata, most lightly to moderately infested prickly-pear hedges survived the cochineal attack. Leucopina bellula has been recovered so far at one release site. The establishment in Israel of both predators is a promising solution to the problem, although it is too early to determine how successful this endeavor will be. Further consequences of the acclimatization of the cochineal and its Mexican predators in Israel are discussed including their possible spread into other countries, particularly in Africa where D. opuntiae is being successfully used for biological control of invasive Opuntia species.
MONTANO-ARIAS, ADRIANA; GRETHER, Rosaura S., CAMARGO-RICALDE, Sara L. and FLORES-OLVERA, María H, 2020. Comparative wood anatomy of eight tree species of Mimosa sect. Batocaulon (Leguminosae) distributed in Mexico and their taxonomic implications. Phytotaxa. 14 January 2020. Vol. 428, no. 3, p. 209–227. DOI https://doi.org/10.11646/phytotaxa.428.3.3.
The great diversity of the genus Mimosa and the difficulty in the circumscription of its species and varieties based on morphology have encouraged the search for characters in other sources of evidence such as wood anatomy, which provides characters of taxonomic importance. The main objective of this study was to identify characters with taxonomic value for Mimosa; we studied the wood anatomy of eight tree species in Mimosa sect. Batocaulon from Mexico: Mimosa acantholoba, M. bahamensis, M. benthamii, M. hexandra, M. leucaenoides, M. tejupilcana, M. tenuiflora, and M. texana belonging to eight series: Acantholobae, Bahamenses, Distachyae, Bimucronatae, Leucaenoideae, Plurijugae, Leiocarpae and Boreales, respectively. One stem fragment (80 cm in length) was collected at 80 cm above soil height, from three plants per species. Twenty-five measurements were taken per individual for 15 anatomical characters. Three species have ring-porous wood and five species have diffuse-porous wood; the species differ in colour, figure, in the prevalence of a certain type of axial parenchyma, in the tangential diameter of the earlywood vessels, in the number of vessels connected by confluent-aliform parenchyma, in the number of series of rays and in the presence or absence of crystal sand in the ray cells. These characters have taxonomic value at species level, but not at series level. At the section level, the presence of homocellular rays distinguished Batocaulon from other sections of the genus. Based on these results, we produced a wood anatomical identification key to the eight studied species.
PÉREZ-RUIZ, Elizabeth, GALLEGOS-SÁNCHEZ, Jaime, CORTEZ-ROMERO, Cesar, SEGURA-LEÓN, Obdulia L., SALINAS-RUIZ, Josafhat and SALAZAR-ORTIZ, Juan, 2020. FecG(E) mutation in pelibuey sheep. Animal Genetics [online]. 2020. Vol. First published: 21 January 2020. DOI https://doi.org/10.1111/age.12912. Available from: https://onlinelibrary.wiley.com/doi/full/10.1111/age.12912
Brief Note. Background: Bone morphogenic protein (BMP15) and growth differentiation factor 9 (GDF9) are both essential for follicular growth.1 Polymorphisms (SNP) of these two genes are associated with increases in ovulation rate and prolificacy or sterility in different sheep breeds.2-4 Mexican Pelibuey sheep (MPS) are very well adapted to the climatic conditions of Mexico and are central to the ovine meat production of the country.5, 6 MPS have excellent maternal abilities, a shorter anoestrus period and prolificacy values of 1.55.7 This study sought to detect polymorphisms in the BMP15 and GDF9 genes in MPS.
QUIÑONEZ-BARRAZA, Gerónimo, ZHAO, Dehai, DE LOS SANTOS-POSADAS, Héctor M. and CORRAL-RIVAS, José J., 2020. An approximate height growth and site index model for Quercus sideroxyla Bonpl. in mixed-species stands of Durango, Mexico. Revista Chapingo Serie Ciencias Forestales y del Ambiente. April 2020. Vol. 26, no. 1, p. 53–69. DOI https://doi.org/10.5154/r.rchscfa.2019.03.025.
Introduction: Predictions of dominant or co-dominant height are an important element in planning forest management with timber production objectives. Objective: To develop dominant height growth and site index (SI) equations for Quercus sideroxyla Bonpl. Materials and methods: The height current annual increment model was fitted, and the age of the sections was estimated from a database of 29 stem-mapped plots. A taper analysis data of 37 trees was also used to reconstruct dominant height growth trajectories. Three equations based on algebraic difference approach (ADA; one anamorphic and two polymorphic) and an equation based on generalized algebraic difference approach (GADA) were used to simultaneously model the dominant height and SI. Results and discussion: The ADA polymorphic equations were statistically better than the anamorphic equation, according to the adjusted coefficient of determination, root mean square error, mean bias, Akaike’s information criterion and log-likelihood; however, the GADA equation was better than the ADA equations. The growth curves were biologically realistic and showed SI classes at a base age of 60 years. Conclusions: The developed equations can be used for decision making in forest management when Q. sideroxyla shows dominance over Pinus species and the main objective is timber production.
RAMÍREZ-RIVERA, Emmanuel de Jesús, MORALES-CARRERA, Uriel A., LIMÓN-RIVERA, Rogelio, CASTILLO-MARTÍNEZ, Susana I., HERNÁNDEZ-SALINAS, Gregorio, RAMÍREZ-SUCRE, Manuel O. and HERRERA-CORREDOR, José A., 2020. Analytic hierarchy process as an alternative for the selection of vocabularies for sensory characterization and consumer preference. Journal of Sensory Studies. February 2020. Vol. 35, no. 1, p. e12547. DOI https://doi.org/10.1111/joss.12547.
The objective of the present study was to investigate the Analytic Hierarchy Process (AHP) technique as an alternative to the ISO standard 11035 for the sensory characterization and consumer preference of coffee through External Preference Mapping (PREFMAP). The methodological context consisted in the generation of the sensory vocabulary applying the techniques ISO standard 11035 using a trained panel and AHP using an expert panel. PREFMAP was then carried out to explain the preference of coffee consumers according to the vocabularies generated. The results showed that the sensory vocabulary using AHP was similar to that obtained with ISO standard 11035 and the judgments of the panel of experts were consistent. The PREFMAP’S explained in a similar way the preference of coffee consumers. The use of the AHP technique is a new, reliable, and easy-to-execute alternative for the selection of sensory vocabulary for characterization and explanation of consumer preference. Practical Applications The Analytic Hierarchy Process technique is a reliable alternative for the selection of sensory attributes. The attributes are evaluated by paired comparison and, by mathematical procedure, the weight (W) of each attribute and sensory dimension is obtained. Consistency indicators are also included to support and validate panel judgments. This new proposal can be easily implemented at an industrial and academic level for the development of different sensometric investigations that require characterizing and analyzing the preference of consumers of different foods.
TRUJILLO-MARTÍNEZ, Héctor A., REYES-HERNÁNDEZ, Valentín J., GOMEZ-GUERRERO, Armando and AMPARO BORJA-DE LA ROSA, Ma, 2020. Radial growth of pine species in stands subject to selection cutting in Santa Maria Lachixio, Oaxaca, Mexico. Revista Chapingo Serie Ciencias Forestales Y Del Ambiente. April 2020. Vol. 26, no. 1, p. 123–139. DOI https://doi.org/10.5154/r.rchscfa.2018.09.064.
Introduction: The evaluation of the effect of management activities on trees is essential to gain a better understanding of the processes occurring in the stands. Objective: To evaluate the effect of selection cutting on the growth of pine species in uneven-aged stands. Materials and methods: Thirty sampling sites were established in two mixed pine stands subjected to selection cutting in 2003. The stumps of this harvest were used as site centers and the growth of the residual trees was evaluated in a 10-m radius; tree-size variables and competition indices were calculated. Results and discussion: In the first five years after the harvest, 47 % of residual trees showed significant growth (P <= 0.05). Stump diameter, diameter at breast height and competition were the most important variables to explain growth. The competition area of the harvested individuals (stumps) showed influence up to a 15-m radius. The increase in basal area was 71 % with respect to pre-harvest growth. This increase was related to the basal area sum of the residual trees and 1.3 m(2) per site (41.3 m(2) .ha(-1)) was established as the threshold from which a release is nullified by residual competition. Conclusion: Selection cutting influences residual tree growth in a differentiated way; the response may be positive, negative or nil depending on size and local competition.
VÁZQUEZ-GARCÍA, Verónica, 2020. Gender and ejido privatization in San Salvador Atenco, Mexico. Perfiles Latinoamericanos. 2020. Vol. 28, no. 55, p. 325–348. DOI https://doi.org/10.18504/pl2855-013-2020.
Thanks to the agrarian reform of 1917, about half of Mexico’s territory is in the hands of peasants. However, most landholders are male and the ejido faces the challenge of privatization. Using documental and ethnographic data, this paper examines the gender dynamics of land privatization in the municipality of San Salvador Atenco, Estado de Mexico. Drawing on the insights of feminist political ecology, it is argued that social practices regarding land privatization reproduced power relations based on gender, class and age.
[1] Profesor Investigador Adjunto Colegio de Postgraduados, Campus San Luis potosí, Programa de Maestría en Ciencias en Innovación en el Manejo de Recursos Naturales. Iturbide 73, Salinas de Hidalgo, S.L.P. 78620, México.
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