Sistema Regional de Información
en línea para Revistas Científicas de América Latina,
el Caribe, España y Portugal

Objective: The increase in the number of sheep in herds is accompanied many times by bad practices, which lead to nutritional deficiencies, rises in parasitism and loss of homeostasis. Therefore, gastrointestinal parasites from sheep were characterized from four municipalities of the state of Campeche. Design/methodology/approach: The number of sheep studied was 243, evaluating the body weight, body condition, coloring of the eye mucosae, age, eggs per grams of feces, and family of parasites. The data were analyzed through an ANOVA and Tukey’s means test (P<0.05), as well as Spearman’s correlation analysis using the statistical package Statistica 7. Results: Five parasite families were found (Trichostrongyloidae, Strongyloidae, Trichuridae, Eimeriidae and Anoplocephalidae). In the production systems of the municipality of Calakmul the five families of parasites were found, with a parasite load of 3,571 hpg. The family Trichostrongyloidae presented the highest frequency in the municipalities of Champotón and Calakmul with 52 and 75%, respectively. The animals with best body condition, FAMACHA© and lowest parasite load were observed in Hecelchakán. Limitations on study/implications: It is suggested to carry out a study of anthelmintic resistance, to establish a management of prevention and control of gastrointestinal parasites. Findings/conclusions: The frequency of gastrointestinal parasites is influenced by the management and the municipality of origin within the sheep production systems in the state of Campeche.

Objective: to determine the effect of coumaphos on Rhipicephalus microplus and entomopathogenic nematodes in bovine production units. Design/methodology/approach: Two experiments were carried out: First) tick samples were collected and evaluated, using the Adult Immersion Test (10 ticks per humid chamber), the treatments were applied: 1) Control; 2) Coumaphos 0.1 %; 3) Coumaphos 0.2 %; 4) Coumaphos 0.4 %. An ANOVA was carried out with a completely randomized design (mortality dependent variable and treatment independent variable with four levels) and a multiple comparison of means (Tukey's test). Second experiment) 10 samples of livestock soil where coumaphos is used, which correspond to the Mariano Matamoros ejido, Tamaulipas, and 10 non-livestock soil from the Las Huastecas Experimental Field, were analyzed to determine the presence of entomopathogenic nematodes (EPN). a cross-frequency table between the sampled soils and the Chi-square test. Results: Experiment 1) In counting the tick mortality percentages on the second day after application in group 1) control was 37.5 %, 2) 72.5 %, 3) 80 %, 4) 92.5 %, on day 7 and day 8 there was no difference with 90 % and 100 % mortality. Experiment 2) The soils positive to EPN were 35 % Non-livestock and 25 % Livestock. Limitations on study/implications: it is important to make producers aware of the correct use of chemical products. Findings/conclusions: R. Microplus was susceptible to coumaphos in cattle production units. A greater presence of EPN was found in non-livestock soils, which may be related to the use of chemical products to control parasites.

Objective: to evaluate the historical trends of clam fishery in Alvarado, Veracruz, to determine the current state of its populations and to promote the incorporation of aquaculture activities, to conserve the resource and reduce the negative impact of its fishery. Design/methodology/approach: data were obtained through the CONAPESCA on the arrival notices of clam fishery production from the offices in Alvarado, Veracruz. After analyzing this information, graphs on trends, composition, and proportion by species were made about the capture between the years 1998 to 2021 of the three most important species in the region (Rangia cuneata, Rangia flexuosa and Polymesoda caroliniana.) Results: the three clam species hit peak production in the years 2006 (P. carolineana with 700 t), 2012 (P. carolineana and R. cuneata with 650 t), and 2015 (P. carolineana with 800 t), respectively. Nevertheless, the trend in the last years shows an extraction decrease. Representing more than 50% of the composition, P. carolineana predominates the captures, even though this species enjoys special protection under NOM-059-SEMARNAT-2010. Limitations of the research/implications: there were no limitations. Findings/conclusions: the increase of clam fishery is not recommended due to the diminishing trend and the signs of overexploitation observed in the three species, maintaining less than 50% of peak production. Keywords: Rangia cuneata, Rangia flexuosa, Polymesoda caroliniana, trends, artisanal fishery

O Objective: To provide a comprehensive overview of the generation of bioactive peptides from raw red meat, its by-products, and the waste meat cuts, as well as the bioactive health effects. Design/methodology/approach: A literature search was conducted through the organization and systematized analysis of information for an updated literature review of bioactive peptides in red meat. Results: Meat is a food of great nutritional value for human beings, since the digestibility of its protein stands out. In addition to the nutritional value of this protein, there are some studies in meat where bioactive peptides provide bioactivity mainly as an antihypertensive and antioxidant. Bioactive peptides are generally obtained by enzymatic hydrolysis and through microbial fermentation processes. Subsequently, they are identified by analytical techniques to perform in vitro and in vivo evaluations verifying the bioactivity of the peptides obtained. Limitations on study/implications: The food industry must establish the most reliable methods for generating more reliable peptides to standardize their production and avoid process variability. Findings/conclusions: The bioactive activity to be exerted by the peptides will depend on factors specific to the protein, such as the number of amino acids it contains, the hydrophilic or hydrophobic profile, and size, among others. This information is key to predict the activity the peptide can exert in the human body since many can have multiple activities, the most common being the antioxidant-antihypertensive function.

ABSTRACT Objective: To analyze concepts, structure, classification, biosynthesis and functions of glucosinolates (GSLs) in higher plants. Design/methodology/approach: A search was performed into recent high-impact literature related to glucosinolates (GSLs). Results: GSLs are secondary metabolites rich in N and S. They are divided into aliphatic, aromatic, and indole GSLs depending on the amino acid from which they arise. The products of their hydrolysis, mediated by thioglucoside glucohydrolase, thioglucosidase or myrosinase enzymes (EC 3.2.1.147), play a role in increasing tolerance to biotic and abiotic stress factors. Furthermore, given their composition, they can serve as a nutrient reservoir under nutrient deficiency conditions. Limitations on study/implications: GSLs are synthesized only in species of the Capparidaceae, Brassicaceae, Resedaceae, and Moringaceae families. Findings/conclusions: GSLs are sulfur compounds that can serve as defense mechanisms against biotic and abiotic stress factors and as sources of nutrients in plants, and molecules with important nutraceutical properties in food and human health.

La relación entre los hablantes de lenguas diferentes establecidas en diversas circunstancias presupone un intercambio del que resultan interpenetraciones, en mayor o en menor grado, entre las lenguas implicadas. Una situación de esta naturaleza se hizo presente en Santiago de Cuba en el siglo XIX cuando como resultado de la Revolución de Haití se establece una oleada migratoria hacia esta región del país que luego se mantuvo desde Francia. Este trabajo centra su interés en el contacto ocurrido entre el español y el francés en Santiago de Cuba durante el siglo XIX y cómo la prensa de la época refleja algunas de sus manifestaciones, para ello se realiza el análisis de varios textos y especialmente una crónica aparecida en el periódico El Redactor, en la que se pone de manifiesto las actitudes lingüísticas y la manera en que esta situación de contacto es percibida por algunos de los habitantes de la ciudad.  

The article sets out to analyze conditionally-related policing and urban practices of the late 20th and the early 21st century in San José, the capital city of Costa Rica. To this end, three moments in the city’s recent history are identified and taken into account with regards to the theoretical propositions put forward by Michel Foucault at his Security, Territory, Population seminar. The first moment was the creation, in 1995, of the San José municipal police force as the entity in charge of maintaining public order. The second moment was the implementation of the Regeneration and Repopulation Program in 2004, which was intended as an initiative for urban recovery meant to attract real estate investment to San José. The third moment was the appearance of a complex videocamera system in 2008 meant as a new technological surveillance network. The article concludes by stressing that producing public spaces invariably implies the production of policing measures, and that these two processes have to be understood in conjunction.

Through a methodology based on the Analysis of the Conjuncture (ADC) and Analysis of Protest Events (AEP), this exploratory work focuses on analyzing the dynamics and main characteristics of the protests undertaken by the autonomous Costa Rican college students’ movement during the period from July 18th to November 25th, 2019. This text focuses, on one hand, on understanding the development of the analysis situation in terms of actors, events, scenarios and correlations of force, and, on the other hand, in reconstructing the day of mobilizations in terms of demanding actors, repertoires of action, demands and defendant actors. Among the results, it was observed that the period analyzed was marked by symbolic and contentious action repertoires. However, despite reaching certain important agreements for various reasons, the movement failed to fulfill its objectives.